Simplified block diagram of G33DDC processing chain
The G33DDC API SDK is implemented as a 32-bit dynamic library (G33DDCAPI.dll). It provides object-oriented and non-object-oriented interfaces to control the G33DDC device. This document describes the non-object-oriented interface. The G33DDCAPI.dll library exports several functions that make it possible to control G33DDC receivers.
The API is not fully thread-safe so preferrably it should be used in single-threaded applications. It can be used in multi-threaded applications as well, but with some care: One G33DDC receiver can be controlled from a single user thread only.
A C/C++ header file G33DDCAPI.h is a part of the SDK. The API can be used by any 32-bit application under Microsoft Windows 7, Windows 8, Windows 10 and Windows 11 (including their 64-bit versions).
The G33DDCAPI.dll library can be loaded to the application by two Microsoft Windows API functions. The first one is LoadLibrary and
the other one is LoadLibraryEx. After the library is loaded, it is required to get addresses of exported functions.
When the API is no longer required in the memory, the FreeLibrary function can be used to unload the API. Before the FreeLibrary is called, all the handles to G33DDC devices returned by the OpenDevice function must be closed by the CloseDevice function, otherwise the application can become to unpredictable state.
The following source code shows how to load the API.
#include <stdio.h>
#include "G33DDCAPI.h"
G33DDC_OPEN_DEVICE OpenDevice;
G33DDC_CLOSE_DEVICE CloseDevice;
HMODULE hAPI;
void main(void)
{
//Loading the API
hAPI=LoadLibrary("G33DDCAPI.dll");
if(hAPI!=NULL)
{
//Retrieving addresses of used API functions
OpenDevice=(G33DDC_OPEN_DEVICE)GetProcAddress(hAPI,"OpenDevice");
CloseDevice=(G33DDC_CLOSE_DEVICE)GetProcAddress(hAPI,"CloseDevice");
//Here place code that uses the API
FreeLibrary(hAPI);
}
else
{
//If the LoadLibrary fails
printf("Failed to load G33DDCAPI.dll.\n");
}
}
The G33DDC API provides the GetDeviceList function which returns list of available G33DDC device which can be open by the OpenDevice function.
The following source code produces list of serial numbers of available G33DDC devices.
#include <stdio.h>
#include "G33DDCAPI.h"
G33DDC_GET_DEVICE_LIST GetDeviceList;
HMODULE hAPI;
void main(void)
{
INT32 Count,i;
G33DDC_DEVICE_INFO *DeviceList;
//Loading the API
hAPI=LoadLibrary("G33DDCAPI.dll");
if(hAPI!=NULL)
{
//Retrieving address of the GetDeviceList function
GetDeviceList=(G33DDC_GET_DEVICE_LIST)GetProcAddress(hAPI,"GetDeviceList");
//Retrieving number of available devices
Count=GetDeviceList(NULL,0);
if(Count>=0)
{
if(Count!=0)
{
//Allocating memory for device information structures
DeviceList=(G33DDC_DEVICE_INFO*)malloc(Count*sizeof(G33DDC_DEVICE_INFO));
if(DeviceList!=NULL)
{
//Retrieving information about available devices
Count=GetDeviceList(DeviceList,Count*sizeof(G33DDC_DEVICE_INFO));
if(Count>=0)
{
printf("Available G33DDC devices count=%d:\n",Count);
for(i=0;i<Count;i++)
{
printf("%d. SN: %s\n",i,DeviceList[i].SerialNumber);
}
}
else
{
printf("GetDeviceList failed with error %08X\n",GetLastError());
}
free(DeviceList);
}
else
{
printf("Out of memory\n");
}
}
else
{
printf("No available G33DDC device found.\n");
}
}
else
{
printf("GetDeviceList failed with error %08X\n",GetLastError());
}
FreeLibrary(hAPI);
}
else
{
printf("Failed to load G33DDCAPI.dll.\n");
}
printf("Press enter to exit\n");
getchar();
}
G33DDC device has to be open before it can be controlled. The API provide the OpenDevice function to open the device.
The following source code shows how to open the first available G33DDC device.
#include <stdio.h>
#include "G33DDCAPI.h"
G33DDC_OPEN_DEVICE OpenDevice;
G33DDC_CLOSE_DEVICE CloseDevice;
HMODULE hAPI;
void main(void)
{
INT32 hDevice;
//Loading the API
hAPI=LoadLibrary("G33DDCAPI.dll");
if(hAPI!=NULL)
{
//Retrieving addresses of the OpenDevice and CloseDevice API functions
OpenDevice=(G33DDC_OPEN_DEVICE)GetProcAddress(hAPI,"OpenDevice");
CloseDevice=(G33DDC_CLOSE_DEVICE)GetProcAddress(hAPI,"CloseDevice");
//Opening the first available G33DDC device using predefined G3XDDC_OPEN_FIRST constant
hDevice=OpenDevice(G3XDDC_OPEN_FIRST);
if(hDevice>=0)
{
//Here place code that works with the open G33DDC device
//Closing handle to opened G33DDC device
CloseDevice(hDevice);
}
else
{
printf("OpenDevice failed with error %08X\n",GetLastError());
}
FreeLibrary(hAPI);
}
else
{
//If the LoadLibrary fails
printf("Failed to load G33DDCAPI.dll.\n");
}
}
The GetDeviceList function returns information about available G33DDC devices that can be open.
C/C++ declaration
INT32 __stdcall GetDeviceList(G33DDC_DEVICE_INFO *DeviceList,UINT32 BufferSize);
Address retrieval
G33DDC_GET_DEVICE_LIST GetDeviceList=(G33DDC_GET_DEVICE_LIST)GetProcAddress(hAPI,"GetDeviceList");
Parameters
DeviceList[out] Pointer to array of G33DDC_DEVICE_INFO structures to be filled with information about available G33DDC devices.
This parameter can be NULL only if the BufferSize parameter is zero, otherwise the function fails.BufferSize[in] Specifies the size in bytes of the buffer pointed to by the DeviceList parameter. If this value is zero, function returns number of available G33DDC devices and makes no use of the DeviceList buffer.
Return value
If the function succeeds, the return value is number of available G33DDC devices.
If the function fails, the return value is negative. To get extended error information, call GetLastError.
Opens G33DDC device by its serial number.
C/C++ declaration
INT32 __stdcall OpenDevice(CONST CHAR *SerialNumber);
Address retrieval
G33DDC_OPEN_DEVICE OpenDevice=(G33DDC_OPEN_DEVICE)GetProcAddress(hAPI,"OpenDevice");
Parameters
SerialNumber[in] Pointer to a null-terminated string that specifies the serial number of the G33DDC device to open. It can be used one of the following values instead of serial number:
Value Meaning G3XDDC_OPEN_FIRST The function opens first available G33DDC device. G3XDDC_OPEN_DEMO The function opens demo G33DDC device. This allows to work with the API without physical G33DDC device.
Return value
If the function succeeds, the return value is handle to the specified G33DDC device. This handle can only be used with functions of G33DDC API.
If the function fails, the return value is negative. To get extended error information, call GetLastError.
Remarks
The OpenDevice function can be called from any user thread, the returned handle can only be used in the same thread, otherwise application can become to unpredictable state.
Use the CloseDevice function to close G33DDC device handle returned by OpenDevice.
Closes G33DDC device.
C/C++ declaration
BOOL __stdcall CloseDevice(INT32 hDevice);
Address retrieval
G33DDC_CLOSE_DEVICE CloseDevice=(G33DDC_CLOSE_DEVICE)GetProcAddress(hAPI,"CloseDevice");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Checks if the device is still connected to the computer.
C/C++ declaration
BOOL __stdcall IsDeviceConnected(INT32 hDevice);
Address retrieval
G33DDC_IS_DEVICE_CONNECTED IsDeviceConnected=(G33DDC_IS_DEVICE_CONNECTED)GetProcAddress(hAPI,"IsDeviceConnected");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.
Return value
The function returns non-zero value if the device is still connected.
If the device is disconnected or the function fails return value is zero. To determine if the function failed, call GetLastError. GetLastError returns ERROR_SUCCESS if the device is disconnected or another error code if IsDeviceConnected failed.
Remarks
If it is determined the device is disconnected, corresponding device handle is no longer usable and it should be closed using the CloseDevice function.
Retrieves information about the G33DDC device.
C/C++ declaration
BOOL __stdcall GetDeviceInfo(INT32 hDevice,G33DDC_DEVICE_INFO *Info,UINT32 BufferLength);
Address retrieval
G33DDC_GET_DEVICE_INFO GetDeviceInfo=(G33DDC_GET_DEVICE_INFO)GetProcAddress(hAPI,"GetDeviceInfo");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Info[out] Pointer to a G33DDC_DEVICE_INFO structure to be filled with information about the device. This parameter cannot be NULL.BufferLength[in] Size in bytes of the G33DDC_DEVICE_INFO structure.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets the front panel LED flashing mode.
C/C++ declaration
BOOL __stdcall SetLED(INT32 hDevice,UINT32 LEDMode);
Address retrieval
G33DDC_SET_LED SetLED=(G33DDC_SET_LED)GetProcAddress(hAPI,"SetLED");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.LEDMode[in] Specifies front panel LED flashing mode. It can be one of the following:
Value Meaning G3XDDC_FRONT_PANEL_LED_MODE_DIAG Diagnostic flashing. G3XDDC_FRONT_PANEL_LED_MODE_ON Always on. G3XDDC_FRONT_PANEL_LED_MODE_OFF Always off.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetLED function to determine current flashing mode of the front panel LED.
A complete list of the diagnostic flashing patterns and their meaning is as follows:
No. Pattern Description Mode 1
Off No power 2
Long flash, equal gap No connection to computer 3
Two short flashes USB connected, radio off 4
One short flash followed by a long one USB connected, radio on, ready 5
Two short flashes followed by a long one USB connected, driver not installed 6
Three short flashes USB connected, driver installed, application not running
Determines current flashing mode of device's front panel LED.
C/C++ declaration
BOOL __stdcall GetLED(INT32 hDevice,UINT32 *LEDMode);
Address retrieval
G33DDC_GET_LED GetLED=(G33DDC_GET_LED)GetProcAddress(hAPI,"GetLED");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.LEDMode[out] Pointer to a variable that receives current flashing mode of device's front panel LED. For list of possible values, see SetLED. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Turns the G33DDC device on or off.
C/C++ declaration
BOOL __stdcall SetPower(INT32 hDevice,BOOL Power);
Address retrieval
G33DDC_SET_POWER SetPower=(G33DDC_SET_POWER)GetProcAddress(hAPI,"SetPower");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Power[in] Specifies whether to turn on or off the device. If this parameter is non-zero the device is turned on, if it is zero the device is turned off.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If SetPower turns the device off, all the running streaming are stopped.
Use the GetPower function to determine current power state of the device.
The GetPower function determines whether the device is turned on or off.
C/C++ declaration
BOOL __stdcall GetPower(INT32 hDevice,BOOL *Power);
Address retrieval
G33DDC_GET_POWER GetPower=(G33DDC_GET_POWER)GetProcAddress(hAPI,"GetPower");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Power[out] Pointer to a variable that receives current power state of the device. If it is non-zero, the device is turned on. If it is zero the device is turned off. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets input attenuator.
C/C++ declaration
BOOL __stdcall SetAttenuator(INT32 hDevice,UINT32 Attenuator);
Address retrieval
G33DDC_SET_ATTENUATOR SetAttenuator=(G33DDC_SET_ATTENUATOR)GetProcAddress(hAPI,"SetAttenuator");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Attenuator[in] Value that specifies attenuation level in dB. Possible values are: 0, 3, 6, 9, 12, 15, 18, 21. If the value is not from the list, the SetAttenuator function rounds the value to nearest lower one.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetAttenuator function to determine current setting of the attenuator.
Retrieves current setting of the attenuator.
C/C++ declaration
BOOL __stdcall GetAttenuator(INT32 hDevice,UINT32 *Attenuator);
Address retrieval
G33DDC_GET_ATTENUATOR GetAttenuator=(G33DDC_GET_ATTENUATOR)GetProcAddress(hAPI,"GetAttenuator");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Attenuator[out] Pointer to a variable that receives current attenuation level. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Controls the band pass filter at input.
C/C++ declaration
BOOL __stdcall SetPreselectors(INT32 hDevice,UINT32 Low,UINT32 High);
Address retrieval
G33DDC_SET_PRESELECTORS SetPreselectors=(G33DDC_SET_PRESELECTORS)GetProcAddress(hAPI,"SetPreselectors");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Low[in] Specifies cut-off low frequency of the filter in Hz. Possible values are: 0, 700000, 1200000, 2000000, 2900000, 4000000, 5100000, 5600000, 8300000, 9200000, 9500000, 13300000, 14600000, 16100000, 21600000. If the value is not from the list, the function rounds it to nearest one.High[in] Specifies cut-off high frequency of the filter in Hz. Possible values are: 2200000, 2700000, 4000000, 4900000, 6200000, 7400000, 9400000, 10700000, 12900000, 14600000, 18900000, 23400000, 25800000, 32100000, 50000000. If the value is not from the list, the function rounds it to nearest one.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Value of the Low parameter must not be higher than value of the High parameter, otherwise the function fails.
Use the GetPreselectors function to determine current setting of the preselectors.
Retrieves current setting of input band pass filter.
C/C++ declaration
BOOL __stdcall GetPreselectors(INT32 hDevice,UINT32 *Low,UINT32 *High);
Address retrieval
G33DDC_GET_PRESELECTORS GetPreselectors=(G33DDC_GET_PRESELECTORS)GetProcAddress(hAPI,"GetPreselectors");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Low[out] Pointer to a variable that receives current cut-off low frequency of the filter in Hz. This parameter can be NULL if the application does not require this information.High[out] Pointer to a variable that receives current cut-off high frequency of the filter in Hz. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Enables or disables input preamplifier.
C/C++ declaration
BOOL __stdcall SetPreamp(INT32 hDevice,BOOL Preamp);
Address retrieval
G33DDC_SET_PREAMP SetPreamp=(G33DDC_SET_PREAMP)GetProcAddress(hAPI,"SetPreamp");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Preamp[in] Specifies whether to enable or disable preamplifier. If this parameter is non-zero, the preamplifier is enabled. If the parameter is zero, the preamplifier is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetPreamp function to determine current state of the preamplifier.
Retrieves current state of input preamplifier.
C/C++ declaration
BOOL __stdcall GetPreamp(INT32 hDevice,BOOL *Preamp);
Address retrieval
G33DDC_GET_PREAMP GetPreamp=(G33DDC_GET_PREAMP)GetProcAddress(hAPI,"GetPreamp");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Preamp[out] Pointer to a variable that receives current state of the preamplifier. The value is non-zero if the preamplifier is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Enables or disables ADC dithering.
C/C++ declaration
BOOL __stdcall SetDithering(INT32 hDevice,BOOL Enabled);
Address retrieval
G33DDC_SET_DITHERING SetDithering=(G33DDC_SET_DITHERING)GetProcAddress(hAPI,"SetDithering");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Enabled[in] Specifies whether to enable or disable ADC dithering. If this parameter is non-zero, dithering is enabled. If the parameter is zero, dithering is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetDithering function to determine current state of ADC dithering.
Retrieves current state of ADC dithering.
C/C++ declaration
BOOL __stdcall GetDithering(INT32 hDevice,BOOL *Enabled);
Address retrieval
G33DDC_GET_DITHERING GetDithering=(G33DDC_GET_DITHERING)GetProcAddress(hAPI,"GetDithering");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Enabled[out] Pointer to a variable that receives current state of dithering. The value is non-zero if dithering is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Enables or disables noise blanker on ADC stream.
C/C++ declaration
BOOL __stdcall SetADCNoiseBlanker(INT32 hDevice,BOOL Enabled);
Address retrieval
G33DDC_SET_ADC_NOISE_BLANKER SetADCNoiseBlanker=(G33DDC_SET_ADC_NOISE_BLANKER)GetProcAddress(hAPI,"SetADCNoiseBlanker");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Enabled[in] Specifies whether to enable or disable noise blanker. If this parameter is non-zero, noise blanker is enabled. If the parameter is zero, noise blanker is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetADCNoiseBlanker function to determine current state of the noise blanker.
Retrieves current ADC noise blanker state.
C/C++ declaration
BOOL __stdcall GetADCNoiseBlanker(INT32 hDevice,BOOL *Enabled);
Address retrieval
G33DDC_GET_ADC_NOISE_BLANKER GetADCNoiseBlanker=(G33DDC_GET_ADC_NOISE_BLANKER)GetProcAddress(hAPI,"GetADCNoiseBlanker");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Enabled[out] Pointer to a variable that receives current state of noise blanker. The value is non-zero if noise blanker is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies ADC noise blanker threshold.
C/C++ declaration
BOOL __stdcall SetADCNoiseBlankerThreshold(INT32 hDevice,WORD Threshold);
Address retrieval
G33DDC_SET_ADC_NOISE_BLANKER_THRESHOLD SetADCNoiseBlankerThreshold=
(G33DDC_SET_ADC_NOISE_BLANKER_THRESHOLD)GetProcAddress(hAPI,"SetADCNoiseBlankerThreshold");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Threshold[in] Specifies the maximum acceptable input signal. Maximum possible value of threshold is 32767, in this case the noise blanker has no effect even it is enabled using the SetADCNoiseBlanker function.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetADCNoiseBlankerThreshold function to retrieve current threshold of the noise blanker.
Determines ADC noise blanker threshold.
C/C++ declaration
BOOL __stdcall GetADCNoiseBlankerThreshold(INT32 hDevice,WORD *Threshold);
Address retrieval
G33DDC_GET_ADC_NOISE_BLANKER_THRESHOLD GetADCNoiseBlankerThreshold=
(G33DDC_GET_ADC_NOISE_BLANKER_THRESHOLD)GetProcAddress(hAPI,"GetADCNoiseBlankerThreshold");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Threshold[out] Pointer to a variable that receives threshold of ADC noise blanker. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Starts sending of IF snapshots.
C/C++ declaration
BOOL __stdcall StartIF(INT32 hDevice,WORD Period);
Address retrieval
G33DDC_START_IF StartIF=(G33DDC_START_IF)GetProcAddress(hAPI,"StartIF");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Period[in] Specifies time interval in milliseconds how often the IF snapshots are sent to IFCallback callback function.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The G33DDC device has to be turned on using the SetPower function before use of StartIF, otherwise the StartIF function fails.
Too low value of the Period parameter can dramatically increase data flow through USB wich could cause breaking of running streaming.
Stops sending of IF snapshots.
C/C++ declaration
BOOL __stdcall StopIF(INT32 hDevice);
Address retrieval
G33DDC_STOP_IF StopIF=(G33DDC_STOP_IF)GetProcAddress(hAPI,"StopIF");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The IFCallback callback function is not called after StopIF returns.
Enables or disables frequency spectrum inversion.
C/C++ declaration
BOOL __stdcall SetInverted(INT32 hDevice,BOOL Inverted);
Address retrieval
G33DDC_SET_INVERTED SetInverted=(G33DDC_SET_INVERTED)GetProcAddress(hAPI,"SetInverted");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Inverted[in] Specifies whether to enable or disable frequency spectrum inversion. If this parameter is non-zero, IF spectrum is inverted.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves current frequency spectrum inversion setting.
C/C++ declaration
BOOL __stdcall GetInverted(INT32 hDevice,BOOL *Inverted);
Address retrieval
G33DDC_GET_INVERTED GetInverted=(G33DDC_GET_INVERTED)GetProcAddress(hAPI,"GetInverted");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Inverted[out] Pointer to a variable that receives non-zero value if the frequency spectrum inversion is enabled, and zero if the inversion is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves information about DDC format.
C/C++ declaration
BOOL __stdcall GetDDCInfo(INT32 hDevice,UINT32 DDCTypeIndex,G3XDDC_DDC_INFO *Info);
Address retrieval
G33DDC_GET_DDC_INFO GetDDCInfo=(G33DDC_GET_DDC_INFO)GetProcAddress(hAPI,"GetDDCInfo");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.DDCTypeIndex[in] Specifies index of DDC type. For more information, see remarks.Info[out] Pointer to a G3XDDC_DDC_INFO structure to be filled with information about information of the DDC type.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetDDC1Count function to determine the number of possible DDC types of DDC1. In this case the DDCTypeIndex parameter can vary from zero to one less than the number determined by GetDDC1Count.
Use the GetDDC1 function to determine current DDC type index of DDC1 and the GetDDC2 function to determine current DDC type of DDC2.
Retrieves number of DDC types supported by DDC1.
C/C++ declaration
BOOL __stdcall GetDDC1Count(INT32 hDevice,UINT32 *Count);
Address retrieval
G33DDC_GET_DDC1_COUNT GetDDC1Count=(G33DDC_GET_DDC1_COUNT)GetProcAddress(hAPI,"GetDDC1Count");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Count[out] Pointer to a variable that receives number of DDC types supported by the DDC1. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets current DDC type of DDC1.
C/C++ declaration
BOOL __stdcall SetDDC1(INT32 hDevice,UINT32 DDCTypeIndex);
Address retrieval
G33DDC_SET_DDC1 SetDDC1=(G33DDC_SET_DDC1)GetProcAddress(hAPI,"SetDDC1");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.DDCTypeIndex[in] Specifies index of DDC type to be used in DDC1.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetDDC1Count function to determine the number of possible DDC types of DDC1. The DDCTypeIndex parameter can vary from zero to one less than the number determined by GetDDC1Count.
DDC1 streaming must not run when calling SetDDC1. In other words, DDC1 streaming that is started using the StartDDC1 function has to be stopped using the StopDDC1 function before calling of SetDDC1, otherwise SetDDC1 fails. The SetDDC1 function does not start and stop DDC1 streaming, just changes DDC type of DDC1.
Calling of SetDDC1 can change current DDC type of DDC2 and current bandwidth of demodulator filter, so it is useful to call the GetDDC2 and GetDemodulatorFilterBandwidth functions immediately after SetDDC1 to determine current DDC type of DDC2 and current bandwidth of demodulator filter.
Use the GetDDC1 function to determine current DDC type of the DDC1.
Retrieves information about current DDC type of the DDC1.
C/C++ declaration
BOOL __stdcall GetDDC1(INT32 hDevice,UINT32 *DDCTypeIndex,G3XDDC_DDC_INFO *DDCInfo);
Address retrieval
G33DDC_GET_DDC1 GetDDC1=(G33DDC_GET_DDC1)GetProcAddress(hAPI,"GetDDC1");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.DDCTypeIndex[out] Pointer to a variable that receives index of current DDC type of the DDC1. This parameter can be NULL if the application does not require this information.DDCInfo[out] Pointer to a G3XDDC_DDC_INFO structure to be filled with information about current DDC type of the DDC1. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Returned DDCTypeIndex can be passed to the GetDDCInfo function.
Sets DDC1 center frequency.
C/C++ declaration
BOOL __stdcall SetDDC1Frequency(INT32 hDevice,UINT32 Frequency);
Address retrieval
G33DDC_SET_DDC1_FREQUENCY SetDDC1Frequency=(G33DDC_SET_DDC1_FREQUENCY)GetProcAddress(hAPI,"SetDDC1Frequency");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Frequency[in] Specifies new center frequency of DDC1 in Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Changing of DDC1 frequency causes change of absolute frequency of the DDC2 and demodulator in each channel.
Use the GetDDC1Frequency function to determine current center frequency of DDC1.
Retrieves current center frequency of DDC1.
C/C++ declaration
BOOL __stdcall GetDDC1Frequency(INT32 hDevice,UINT32 *Frequency);
Address retrieval
G33DDC_GET_DDC1_FREQUENCY GetDDC1Frequency=(G33DDC_GET_DDC1_FREQUENCY)GetProcAddress(hAPI,"GetDDC1Frequency");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Frequency[out] Pointer to a variable that receives current center frequency of DDC1 in Hz. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Starts DDC1 streaming.
C/C++ declaration
BOOL __stdcall StartDDC1(INT32 hDevice,UINT32 SamplesPerBuffer);
Address retrieval
G33DDC_START_DDC1 StartDDC1=(G33DDC_START_DDC1)GetProcAddress(hAPI,"StartDDC1");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.SamplesPerBuffer[in] Specifies number of I/Q sample sets in each buffer passed to the DDC1StreamCallback callback function. The value has to be multiple of 64 greater than zero. If it is zero, the StartDDC1 function fails. If it is not multiple of 64 the function rounds it up to nearest multiple of 64.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The G33DDC device has to be turned on using the SetPower function before StartDDC1 is used. Otherwise StartDDC1 fails.
If the DDC1 streaming is already running before use of StartDDC1, StartDDC1 restarts the streaming except it was previously started with the same SamplesPerBuffer parameter. In this case StartDDC1 does nothing. Restart of DDC1 streaming stops of DDC2 and audio streaming in each channel. StartDDC1 does not restart DDC2 and audio streaming.
If DDC1 playback is running (started using StartDDC1Playback function) before use of StartDDC1, StartDDC1 stops it and starts DDC1 streaming from the device.
Use the StopDDC1 function to stop DDC1 streaming.
Decreasing value of the SamplesPerBuffer parameter decreases latency and it may increase CPU usage. Increasing value of the SamplesPerBuffer parameter increased latency and it may decrease CPU usage.
Stops DDC1 streaming.
C/C++ declaration
BOOL __stdcall StopDDC1(INT32 hDevice);
Address retrieval
G33DDC_STOP_DDC1 StopDDC1=(G33DDC_STOP_DDC1)GetProcAddress(hAPI,"StopDDC1");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If DDC1 playback is running (started using StartDDC1Playback) before use of StopDDC1, the StopDDC1 function stops it.
The StopDDC1 function stops all the streaming beyond the DDC1 in processing chain (DDC2 and audio streaming in all the channels).
The DDC1StreamCallback and DDC1PlaybackStreamCallback callback functions are not called after StopDDC1 returns.
Starts DDC1 playback. It allows to pass previously recorded DDC1 I/Q samples to the processing chain instead of the samples received from the device.
C/C++ declaration
BOOL __stdcall StartDDC1Playback(INT32 hDevice,UINT32 SamplesPerBuffer,UINT32 BitsPerSample);
Address retrieval
G33DDC_START_DDC1_PLAYBACK StartDDC1Playback=(G33DDC_START_DDC1_PLAYBACK)GetProcAddress(hAPI,"StartDDC1Playback");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.SamplesPerBuffer[in] Specifies number of I/Q sample sets in each buffer passed to the DDC1PlaybackStreamCallback callback to fill the buffer by the application and to the DDC1StreamCallback callback function. The value has to be multiple of 64 greater than zero. If it is zero, the StartDDC1Playback function fails. If it is not multiple of 64 the function rounds it up to nearest multiple of 64.BitsPerSample[in] Specifies number of bits per I and Q samples. It is used for both DDC1PlaybackStreamCallback and DDC1StreamCallback callback functions. The possible value is one of the following:
Value Meaning 0 I and Q samples have default number of bits. It is given by by BitsPerSample member of the G3XDDC_DDC_INFO structure which can be retrieved using the GetDDC1 or GetDDCInfo function. Possible values are 16 or 32 bits per sample, signed, little endian. 16 I and Q samples have 16 bit (16 bits per I, 16 bits per Q), signed, little endian. 32 I and Q samples have 32 bit (32 bits per I, 32 bits per Q), signed, little endian.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The G33DDC device has to be turned on using SetPower function before use of StartDDC1Playback.
The StartDDC1Playback function stops DDC1 streaming that was previously started by the StartDDC1 or StartDDC1Playback function and starts DDC1 playback with new parameters. Stopping of DDC1 streaming stops DDC2 and audio steaming in each channel. StartDDC1Playback does not restart DDC2 and audio streaming.
Use the StopDDC1 function to stop DDC1 playback.
Pauses DDC1 playback.
C/C++ declaration
BOOL __stdcall PauseDDC1Playback(INT32 hDevice);
Address retrieval
G33DDC_PAUSE_DDC1_PLAYBACK PauseDDC1Playback=(G33DDC_PAUSE_DDC1_PLAYBACK)GetProcAddress(hAPI,"PauseDDC1Playback");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If DDC1 playback is not active or it is already paused, PauseDDC1Playback does nothing.
The DDC1PlaybackStreamCallback and DDC1StreamCallback callback functions can be called once after PauseDDC1Playback returns. Then they are not called until playback is resumed using the ResumeDDC1Playback function.
Resumes paused DDC1 playback.
C/C++ declaration
BOOL __stdcall ResumeDDC1Playback(INT32 hDevice);
Address retrieval
G33DDC_RESUME_DDC1_PLAYBACK ResumeDDC1Playback=(G33DDC_RESUME_DDC1_PLAYBACK)GetProcAddress(hAPI,"ResumeDDC1Playback");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If DDC1 playback is not active or it is not paused, ResumeDDC1Playback does nothing.
Retrieves information about current DDC type of the DDC2.
C/C++ declaration
BOOL __stdcall GetDDC2(INT32 hDevice,UINT32 *DDCTypeIndex,G3XDDC_DDC_INFO *DDCInfo);
Address retrieval
G33DDC_GET_DDC2 GetDDC2=(G33DDC_GET_DDC2)GetProcAddress(hAPI,"GetDDC2");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.DDCTypeIndex[out] Pointer to a variable that receives index of current DDC type of the DDC2. This parameter can be NULL if the application does not require this information.DDCInfo[out] Pointer to a G3XDDC_DDC_INFO structure to be filled with information about current DDC type of the DDC2. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Each channel has its own DDC2, see the block diagram. DDC type of each DDC2 is the same and it depends on DDC type of DDC1, it cannot be changed by the application directly. DDC type of DDC2 is equal to DDC type of DDC1 if DDC type index of DDC1 is less than or equal to 5 (sample rate: 80 kHz, bandwidth: 64 kHz, bits per sample: 32). If DDC type index of DDC1 is above 5, DDC type index of DDC2 is always 5. Changing of DDC type of DDC1 can cause change of DDC type of DDC2, so it is useful to call GetDDC2 immediately after the SetDDC1 function to determine current DDC type of DDC2 if the application needs to know parameters of DDC2.
The BitsPerSample member of the G3XDDC_DDC_INFO structure is not used and it can be ignored for DDC2. I and Q samples in buffers passed to the DDC2StreamCallback and DDC2PreprocessedStreamCallback DDC2 callback functions are always in IEEE float (32 bit, little endian) format.
Returned DDCTypeIndex can be passed to the GetDDCInfo function.
Sets relative center frequency of DDC2 for given channel.
C/C++ declaration
BOOL __stdcall SetDDC2Frequency(INT32 hDevice,UINT32 Channel,INT32 Frequency);
Address retrieval
G33DDC_SET_DDC2_FREQUENCY SetDDC2Frequency=(G33DDC_SET_DDC2_FREQUENCY)GetProcAddress(hAPI,"SetDDC2Frequency");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Frequency[in] Specifies new center frequency of DDC2 in Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Value of the Frequency parameter is center frequency of the DDC2 relative to center of the DDC1. The value can be negative.
Absolute frequency of the DDC2 is given by the following formula:
faDDC2[i] = fDDC1 + frDDC2[i]
Where faDDC2[i] is absolute center frequency of DDC2 of i-th channel in Hz, fDDC1 is center frequency of the DDC1 in Hz (set using the SetDDC1Frequency function) and frDDC2[i] is relative center frequency of DDC2 of i-th channel in Hz (set using SetDDC2Frequency).
Changing of DDC2 relative frequency changes absolute frequency of the DDC2 and demodulator in the specified channel.
Use the GetDDC2Frequency function to determine current relative center frequency of the DDC2 for given channel.
The following example shows three methods how it is possible to set absolute DDC2 center frequency of channel 0 to 11.01 MHz:
INT32 hDevice; //Handle to G33DDC device returned by the OpenDevice function //1. method SetDDC1Frequency(hDevice,11010000); SetDDC2Frequency(hDevice,0,0); //2. method, it can be used if bandwidth of DDC2 is less than bandwidth of DDC1 SetDDC1Frequency(hDevice,11000000); SetDDC2Frequency(hDevice,0,10000); //3. method, it can be used if bandwidth of DDC2 is less than bandwidth of DDC1 SetDDC1Frequency(hDevice,11020000); SetDDC2Frequency(hDevice,0,-10000);
Retrieves current relative center frequency of DDC2.
C/C++ declaration
BOOL __stdcall GetDDC2Frequency(INT32 hDevice,UINT32 Channel,INT32 *Frequency);
Address retrieval
G33DDC_GET_DDC2_FREQUENCY GetDDC2Frequency=(G33DDC_GET_DDC2_FREQUENCY)GetProcAddress(hAPI,"GetDDC2Frequency");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Frequency[out] Pointer to a variable that receives current relative center frequency of DDC2 in Hz. The returned value can be negative. See remarks of the SetDDC2Frequency for information how to calculate absolute center frequency of DDC2. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Starts DDC2 streaming for given channel.
C/C++ declaration
BOOL __stdcall StartDDC2(INT32 hDevice,UINT32 Channel,UINT32 SamplesPerBuffer);
Address retrieval
G33DDC_START_DDC2 StartDDC2=(G33DDC_START_DDC2)GetProcAddress(hAPI,"StartDDC2");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.SamplesPerBuffer[in] Specifies number of I/Q sample sets in each buffer passed to the DDC2StreamCallback and DDC2PreprocessedStreamCallback callback functions. The value has to be multiple of 64 greater than zero. If it is zero, the StartDDC2 function fails. If it is not multiple of 64 the function rounds it up to nearest multiple of 64.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Before StartDDC2 is used, the G33DDC device has to be turned on using the SetPower function and DDC1 streaming has to be started using the StartDDC1 or StartDDC1Playback function, otherwise StartDDC2 fails.
If the DDC2 streaming for given channel is already running, StartDDC2 restarts it except the streaming was previously started with the same SamplesPerBuffer parameter. In this case StartDDC2 does nothing. Restart of the DDC2 streaming stops audio streaming for give channel. StartDDC2 does not restart audio streaming.
Use the StopDDC2 function to stop DDC2 streaming.
Decreasing value of the SamplesPerBuffer parameter decreases latency and it may increase CPU usage. Increasing value of the SamplesPerBuffer parameter increased latency and it may decrease CPU usage.
Stops DDC2 streaming for given channel.
C/C++ declaration
BOOL __stdcall StopDDC2(INT32 hDevice,UINT32 Channel);
Address retrieval
G33DDC_STOP_DDC2 StopDDC2=(G33DDC_STOP_DDC2)GetProcAddress(hAPI,"StopDDC2");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If audio streaming for given channel is running, it is stopped too.
If DDC2 streaming is not active, StopDDC2 does nothing.
The DDC2StreamCallback and DDC2PreprocessedStreamCallback callback functions are not called after StopDDC2 returns.
Enables or disables noise blanker on DDC2 stream.
C/C++ declaration
BOOL __stdcall SetDDC2NoiseBlanker(INT32 hDevice,UINT32 Channel,BOOL Enabled);
Address retrieval
G33DDC_SET_DDC2_NOISE_BLANKER SetDDC2NoiseBlanker=(G33DDC_SET_DDC2_NOISE_BLANKER)GetProcAddress(hAPI,"SetDDC2NoiseBlanker");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Enabled[in] Specifies whether to enable or disable noise blanker. If this parameter is non-zero, noise blanker is enabled. If the parameter is zero, noise blanker is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetDDC2NoiseBlanker function to determine current state of the noise blanker.
Retrieves current DDC2 noise blanker state.
C/C++ declaration
BOOL __stdcall GetDDC2NoiseBlanker(INT32 hDevice,UINT32 Channel,BOOL *Enabled);
Address retrieval
G33DDC_GET_DDC2_NOISE_BLANKER GetDDC2NoiseBlanker=(G33DDC_GET_DDC2_NOISE_BLANKER)GetProcAddress(hAPI,"GetDDC2NoiseBlanker");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Enabled[out] Pointer to a variable that receives current state of noise blanker. The value is non-zero if noise blanker is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies DDC2 noise blanker threshold.
C/C++ declaration
BOOL __stdcall SetDDC2NoiseBlankerThreshold(INT32 hDevice,UINT32 Channel,double Threshold);
Address retrieval
G33DDC_SET_DDC2_NOISE_BLANKER_THRESHOLD SetDDC2NoiseBlankerThreshold=
(G33DDC_SET_DDC2_NOISE_BLANKER_THRESHOLD)GetProcAddress(hAPI,"SetDDC2NoiseBlankerThreshold");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Threshold[in] Specifies threshold in %.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetDDC2NoiseBlankerThreshold function to retrieve current threshold of the noise blanker.
Retrieves DDC2 noise blanker threshold.
C/C++ declaration
BOOL __stdcall GetDDC2NoiseBlankerThreshold(INT32 hDevice,UINT32 Channel,double *Threshold);
Address retrieval
G33DDC_GET_DDC2_NOISE_BLANKER_THRESHOLD GetDDC2NoiseBlankerThreshold=
(G33DDC_GET_DDC2_NOISE_BLANKER_THRESHOLD)GetProcAddress(hAPI,"GetDDC2NoiseBlankerThreshold");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Threshold[out] Pointer to a variable that receives threshold of the noise blanker. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Determines value which indicates percentage ratio between short time average signal level and maximum level.
C/C++ declaration
BOOL __stdcall GetDDC2NoiseBlankerExcessValue(INT32 hDevice,UINT32 Channel,double *Value);
Address retrieval
G33DDC_GET_DDC2_NOISE_BLANKER_EXCESS_VALUE GetDDC2NoiseBlankerExcessValue=
(G33DDC_GET_DDC2_NOISE_BLANKER_EXCESS_VALUE)GetProcAddress(hAPI,"GetDDC2NoiseBlankerExcessValue");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Value[out] Pointer to a variable that receives current excess value in %. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Determines current signal level for given channel.
C/C++ declaration
BOOL __stdcall GetSignalLevel(INT32 hDevice,UINT32 Channel,FLOAT *Peak,FLOAT *RMS);
Address retrieval
G33DDC_GET_SIGNAL_LEVEL GetSignalLevel=(G33DDC_GET_SIGNAL_LEVEL)GetProcAddress(hAPI,"GetSignalLevel");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Peak[out] Pointer to a variable that receives current signal level (peak) in Volts. This parameter can be NULL if the application does not require this information.RMS[out] Pointer to a variable that receives current signal level (RMS) in Volts. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
DDC2 streaming has to be active (started using the StartDDC2 function) before calling of GetSignalLevel, otherwise returned peak and RMS signal levels are zero.
Signal level is evaluated from signal after the demodulator filter and before the notch filter (see block diagram), the signal is selected by the demodulator filter.
Signal level is evaluated for each buffer that processed by the demoduletor filter. Buffer size (signal level evaluation rate) is given by the SamplesPerBuffer parameter of the StartDDC2 function.
The DDC2PreprocessedStreamCallback callback function provides signal level for each buffer passed the callback, i.e. for each buffer used in signal level evaluation. This provides way to get signal level from each processed buffer without need of pulling it using GetSignalLevel.
To convert RMS signal level in Volts to power in dBm use the following formulas:
P[W] = (VRMS)2 / R = (VRMS)2 / 50
P[dBm]= 10 * log10( P[W] * 1000 )
Where VRMS is RMS signal level in Volts obtained by GetSignalLevel, R is G33DDC receiver input impedance (50 Ω), P[W] is power in Watts, P[dBm] is power in dBm and 1000 is conversion coefficient W -> mW.
The following example shows how to obtain current signal level in dBm from channel 0:
#include <stdio.h> #include <math.h> INT32 hDevice; //handle to G33DDC device returned by the OpenDevice function float P_dBm,V_RMS; GetSignalLevel(hDevice,0,NULL,&V_RMS); P_dBm=10.0*log10(V_RMS*V_RMS*(1000.0/50.0)); printf("Current signal level [RMS]: %.1f dBm\n",P_dBm);
Enables or disables notch filter for given channel.
C/C++ declaration
BOOL __stdcall SetNotchFilter(INT32 hDevice,UINT32 Channel,UINT32 NotchFilterIndex,BOOL Enabled);
Address retrieval
G33DDC_SET_NOTCH_FILTER SetNotchFilter=(G33DDC_SET_NOTCH_FILTER)GetProcAddress(hAPI,"SetNotchFilter");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.NotchFilterIndex[in] Specifies notch filter index. Possible values are: 0, 1.Enabled[in] Specifies whether to enable or disable notch filter. If this parameter is non-zero, the filter is enabled. If the parameter is zero, the filter is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetNotchFilter function to determine whether the filter is enabled or disabled.
Retrieves current notch filter state for given channel.
C/C++ declaration
BOOL __stdcall GetNotchFilter(INT32 hDevice,UINT32 Channel,UINT32 NotchFilterIndex,BOOL *Enabled);
Address retrieval
G33DDC_GET_NOTCH_FILTER GetNotchFilter=(G33DDC_GET_NOTCH_FILTER)GetProcAddress(hAPI,"GetNotchFilter");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.NotchFilterIndex[in] Specifies notch filter index. Possible values are: 0, 1.Enabled[out] Pointer to a variable that receives current state of the notch filter. The value is non-zero if the filter is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies relative center frequency of the notch filter for given channel.
C/C++ declaration
BOOL __stdcall SetNotchFilterFrequency(INT32 hDevice,UINT32 Channel,UINT32 NotchFilterIndex,INT32 Frequency);
Address retrieval
G33DDC_SET_NOTCH_FILTER_FREQUENCY SetNotchFilterFrequency=
(G33DDC_SET_NOTCH_FILTER_FREQUENCY)GetProcAddress(hAPI,"SetNotchFilterFrequency");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.NotchFilterIndex[in] Specifies notch filter index. Possible values are: 0, 1.Frequency[in] Specifies new center frequency of the notch filter in Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Value of the Frequency parameter is new center frequency of the notch filter relative to center of the DDC2 (see the SetDDC2Frequency function). The value can be negative.
Use the GetNotchFilterFrequency function to retrieve current center frequency of the notch filter.
Retrieves current relative center frequency of the notch filter.
C/C++ declaration
BOOL __stdcall GetNotchFilterFrequency(INT32 hDevice,UINT32 Channel,UINT32 NotchFilterIndex,INT32 *Frequency);
Address retrieval
G33DDC_GET_NOTCH_FILTER_FREQUENCY GetNotchFilterFrequency=
(G33DDC_GET_NOTCH_FILTER_FREQUENCY)GetProcAddress(hAPI,"GetNotchFilterFrequency");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.NotchFilterIndex[in] Specifies notch filter index. Possible values are: 0, 1.Frequency[out] Pointer to a variable that receives current center frequency of the notch filter. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies bandwidth of the notch filter for given channel.
C/C++ declaration
BOOL __stdcall SetNotchFilterBandwidth(INT32 hDevice,UINT32 Channel,UINT32 NotchFilterIndex,UINT32 Bandwidth);
Address retrieval
G33DDC_SET_NOTCH_FILTER_BANDWIDTH SetNotchFilterBandwidth=
(G33DDC_SET_NOTCH_FILTER_BANDWIDTH)GetProcAddress(hAPI,"SetNotchFilterBandwidth");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.NotchFilterIndex[in] Specifies notch filter index. Possible values are: 0, 1.Bandwidth[in] Specifies new bandwidth of the notch filter in Hz. The bandwidth can be from range 1 - 3000 Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetNotchFilterBandwidth function to retrieve current bandwidth of the notch filter.
Retrieves current bandwidth of the notch filter for given channel.
C/C++ declaration
BOOL __stdcall GetNotchFilterBandwidth(INT32 hDevice,UINT32 Channel,UINT32 NotchFilterIndex,UINT32 *Bandwidth);
Address retrieval
G33DDC_GET_NOTCH_FILTER_BANDWIDTH GetNotchFilterBandwidth=
(G33DDC_GET_NOTCH_FILTER_BANDWIDTH)GetProcAddress(hAPI,"GetNotchFilterBandwidth");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.NotchFilterIndex[in] Specifies notch filter index. Possible values are: 0, 1.Bandwidth[out] Pointer to a variable that receives current bandwidth of the notch filter. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies notch filter length for given channel. The notch filter is implemented as FIR filter. This function specifies number of coefficients used in filtration procedure.
C/C++ declaration
BOOL __stdcall SetNotchFilterLength(INT32 hDevice,UINT32 Channel,UINT32 NotchFilterIndex,UINT32 Length);
Address retrieval
G33DDC_SET_NOTCH_FILTER_LENGTH SetNotchFilterLength=
(G33DDC_SET_NOTCH_FILTER_LENGTH)GetProcAddress(hAPI,"SetNotchFilterLength");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.NotchFilterIndex[in] Specifies notch filter index. Possible values are: 0, 1.Length[in] Specifies length of the notch filter. The value has to be multiple of 64, greater than or equal to 64 and less than or equal to 32768. If it is not multiple of 64 the function rounds it up to nearest multiple of 64.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Increasing the filter length increases filter steepness and it may increase CPU usage.
Use the GetNotchFilterLength function to determine current length of the notch filter.
Retrieves current notch filter length for given channel.
C/C++ declaration
BOOL __stdcall GetNotchFilterLength(INT32 hDevice,UINT32 Channel,UINT32 NotchFilterIndex,UINT32 *Length);
Address retrieval
G33DDC_GET_NOTCH_FILTER_LENGTH GetNotchFilterLength=
(G33DDC_GET_NOTCH_FILTER_LENGTH)GetProcAddress(hAPI,"GetNotchFilterLength");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.NotchFilterIndex[in] Specifies notch filter index. Possible values are: 0, 1.Length[out] Pointer to a variable that receives current length of the notch filter. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Enables or disables AGC for given channel.
C/C++ declaration
BOOL __stdcall SetAGC(INT32 hDevice,UINT32 Channel,BOOL Enabled);
Address retrieval
G33DDC_SET_AGC SetAGC=(G33DDC_SET_AGC)GetProcAddress(hAPI,"SetAGC");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Enabled[in] Specifies whether to enable or disable AGC. If this parameter is non-zero, the AGC is enabled. If the parameter is zero, the AGC is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If the AGC is disabled, the signal is affected by fixed gain specified using the SetGain function.
Use the GetAGC function to determine current state of the AGC.
Retrieves current state of the AGC for given channel.
C/C++ declaration
BOOL __stdcall GetAGC(INT32 hDevice,UINT32 Channel,BOOL *Enabled);
Address retrieval
G33DDC_GET_AGC GetAGC=(G33DDC_GET_AGC)GetProcAddress(hAPI,"GetAGC");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Enabled[out] Pointer to a variable that receives current state of the AGC. The value is non-zero if the AGC is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets parameters of the AGC for given channel.
C/C++ declaration
BOOL __stdcall SetAGCParams(INT32 hDevice,UINT32 Channel,double AttackTime,double DecayTime,double ReferenceLevel);
Address retrieval
G33DDC_SET_AGC_PARAMS SetAGCParams=(G33DDC_SET_AGC_PARAMS)GetProcAddress(hAPI,"SetAGCParams");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.AttackTime[in] Specifies new attack time of the AGC in seconds.DecayTime[in] Specifies new decay time of the AGC in seconds.ReferenceLevel[in] Specifies new reference level of the AGC in dB.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetAGCParams function to determine current parameters of the AGC.
Retrieves current parameters of the AGC for given channel.
C/C++ declaration
BOOL __stdcall GetAGCParams(INT32 hDevice,UINT32 Channel,double *AttackTime,double *DecayTime,double *ReferenceLevel);
Address retrieval
G33DDC_GET_AGC_PARAMS GetAGCParams=(G33DDC_GET_AGC_PARAMS)GetProcAddress(hAPI,"GetAGCParams");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.AttackTime[out] Pointer to a variable that receives current attack time of the AGC in seconds. This parameter can be NULL if the application does not require this information.DecayTime[out] Pointer to a variable that receives current decay time of the AGC in seconds. This parameter can be NULL if the application does not require this information.ReferenceLevel[out] Pointer to a variable that receives current reference level of the AGC in dB. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets maximum gain of the AGC for given channel.
C/C++ declaration
BOOL __stdcall SetMaxAGCGain(INT32 hDevice,UINT32 Channel,double MaxGain);
Address retrieval
G33DDC_SET_MAX_AGC_GAIN SetMaxAGCGain=(G33DDC_SET_MAX_AGC_GAIN)GetProcAddress(hAPI,"SetMaxAGCGain");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.MaxGain[in] Specifies new maximum gain of the AGC in dB.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetMaxAGCGain function to determine maximum gain of the AGC.
Retrieves current maximum gain of the AGC for given channel.
C/C++ declaration
BOOL __stdcall GetMaxAGCGain(INT32 hDevice,UINT32 Channel,double *MaxGain);
Address retrieval
G33DDC_GET_MAX_AGC_GAIN GetMaxAGCGain=(G33DDC_GET_MAX_AGC_GAIN)GetProcAddress(hAPI,"GetMaxAGCGain");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.MaxGain[out] Pointer to a variable that receives current maximum gain of the AGC in dB. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets fixed gain for given channel. This gain is applied to I/Q signal if the AGC is disabled, otherwise it is not used.
C/C++ declaration
BOOL __stdcall SetGain(INT32 hDevice,UINT32 Channel,double Gain);
Address retrieval
G33DDC_SET_GAIN SetGain=(G33DDC_SET_GAIN)GetProcAddress(hAPI,"SetGain");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Gain[in] Specifies new fixed gain in dB.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetGain function to determine current fixed gain.
Retrieves current fixed gain for given channel.
C/C++ declaration
BOOL __stdcall GetGain(INT32 hDevice,UINT32 Channel,double *Gain);
Address retrieval
G33DDC_GET_GAIN GetGain=(G33DDC_GET_GAIN)GetProcAddress(hAPI,"GetGain");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Gain[out] Pointer to a variable that receives current fixed gain in dB. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves current gain that is applied to I/Q signal.
C/C++ declaration
BOOL __stdcall GetCurrentGain(INT32 hDevice,UINT32 Channel,double *CurrentGain);
Address retrieval
G33DDC_GET_CURRENT_GAIN GetCurrentGain=(G33DDC_GET_CURRENT_GAIN)GetProcAddress(hAPI,"GetCurrentGain");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.CurrentGain[out] Pointer to a variable that receives current gain in dB. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If the AGC is enabled (using the SetAGC function), the variable pointed to by the CurrentGain parameter is filled by current gain of the AGC. If the AGC is disabled, the variable pointed to by the CurrentGain parameter is filled by fixed gain that is specified using the SetGain function.
Sets bandwidth of the demodulator filter for given channel.
C/C++ declaration
BOOL __stdcall SetDemodulatorFilterBandwidth(INT32 hDevice,UINT32 Channel,UINT32 Bandwidth);
Address retrieval
G33DDC_SET_DEMODULATOR_FILTER_BANDWIDTH SetDemodulatorFilterBandwidth=
(G33DDC_SET_DEMODULATOR_FILTER_BANDWIDTH)GetProcAddress(hAPI,"SetDemodulatorFilterBandwidth");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Bandwidth[in] Specifies new bandwidth of the demodulator filter in Hz. Possible values are from range 1 Hz to current DDC2 bandwidth. Use the GetDDC2 function to retrieve information about current DDC type of DDC2.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The demodulator filter bandwidth can be changed using the SetDDC1 function. It can change DDC type of DDC2 and if the current demodulator filter bandwidth is greater than new bandwidth of DDC2, the demodulator filter bandwidth is reduced. So it is useful to call the GetDemodulatorFilterBandwidth function immediately after SetDDC1.
Retrieves current demodulator filter bandwidth for given channel.
C/C++ declaration
BOOL __stdcall GetDemodulatorFilterBandwidth(INT32 hDevice,UINT32 Channel,UINT32 *Bandwidth);
Address retrieval
G33DDC_GET_DEMODULATOR_FILTER_BANDWIDTH GetDemodulatorFilterBandwidth=
(G33DDC_GET_DEMODULATOR_FILTER_BANDWIDTH)GetProcAddress(hAPI,"GetDemodulatorFilterBandwidth");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Bandwidth[out] Pointer to a variable that receives current demodulator filter bandwidth. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets demodulator filter shift for given channel.
C/C++ declaration
BOOL __stdcall SetDemodulatorFilterShift(INT32 hDevice,UINT32 Channel,INT32 Shift);
Address retrieval
G33DDC_SET_DEMODULATOR_FILTER_SHIFT SetDemodulatorFilterShift=
(G33DDC_SET_DEMODULATOR_FILTER_SHIFT)GetProcAddress(hAPI,"SetDemodulatorFilterShift");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Shift[in] Specifies new shift of the demodulator filter in Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Value of the Shift parameter is shift in Hz relative to center of the demodulator. This value can be negative.
This function does not change demodulator frequency just shift the filter from demodulator's centre.
Use the GetDemodulatorFilterShift function to determine current demodulator filter shift.
Retrieves current shift of the demodulator filter for given channel.
C/C++ declaration
BOOL __stdcall GetDemodulatorFilterShift(INT32 hDevice,UINT32 Channel,INT32 *Shift);
Address retrieval
G33DDC_GET_DEMODULATOR_FILTER_SHIFT GetDemodulatorFilterShift=
(G33DDC_GET_DEMODULATOR_FILTER_SHIFT)GetProcAddress(hAPI,"GetDemodulatorFilterShift");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Shift[out] Pointer to a variable that receives current shift of the demodulator. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies demodulator filter length for given channel. The demodulator filter is implemented as FIR filter. This function specifies number of coefficients used in filtration procedure..
C/C++ declaration
BOOL __stdcall SetDemodulatorFilterLength(INT32 hDevice,UINT32 Channel,UINT32 Length);
Address retrieval
G33DDC_SET_DEMODULATOR_FILTER_LENGTH SetDemodulatorFilterLength=
(G33DDC_SET_DEMODULATOR_FILTER_LENGTH)GetProcAddress(hAPI,"SetDemodulatorFilterLength");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Length[in] Specifies length of the demodulator filter. The value has to be multiple of 64, greater than or equal to 64 and less than or equal to 32768. If it is not multiple of 64 the function rounds it up to nearest multiple of 64..
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Increasing the filter length increases filter steepness and it may increase CPU usage.
Use the GetDemodulatorFilterLength function to determine current length of the demodulator filter.
Retrieves current length of the demodulator filter for given channel.
C/C++ declaration
BOOL __stdcall GetDemodulatorFilterLength(INT32 hDevice,UINT32 Channel,UINT32 *Length);
Address retrieval
G33DDC_GET_DEMODULATOR_FILTER_LENGTH GetDemodulatorFilterLength=
(G33DDC_GET_DEMODULATOR_FILTER_LENGTH)GetProcAddress(hAPI,"GetDemodulatorFilterLength");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Length[out] Pointer to a variable that receives current demodulator filter length. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets demodulator mode for given channel.
C/C++ declaration
BOOL __stdcall SetDemodulatorMode(INT32 hDevice,UINT32 Channel,UINT32 Mode);
Address retrieval
G33DDC_SET_DEMODULATOR_MODE SetDemodulatorMode=(G33DDC_SET_DEMODULATOR_MODE)GetProcAddress(hAPI,"SetDemodulatorMode");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Mode[in] Specifies new demodulator mode. This value can be one of the following:
Value Meaning G3XDDC_MODE_CW Continuous wave G3XDDC_MODE_AM Amplitude modulation G3XDDC_MODE_FM Frequency modulation G3XDDC_MODE_LSB Lower sideband modulation G3XDDC_MODE_USB Upper sideband modulation G3XDDC_MODE_AMS Amplitude modulation G3XDDC_MODE_DSB Double sideband modulation G3XDDC_MODE_ISB Independent sideband modulation G3XDDC_MODE_DRM Digital Radio Mondiale
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
DRM demodulation is only available if valid DRM key is loaded using the SetDRMKey function. More information about obtaining DRM key at https://www.winradio.com/home/drm.htm.
Use the GetDemodulatorMode function to retrieve current demodulator mode.
Retrieves current demodulator mode for given channel.
C/C++ declaration
BOOL __stdcall GetDemodulatorMode(INT32 hDevice,UINT32 Channel,UINT32 *Mode);
Address retrieval
G33DDC_GET_DEMODULATOR_MODE GetDemodulatorMode=(G33DDC_GET_DEMODULATOR_MODE)GetProcAddress(hAPI,"GetDemodulatorMode");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Mode[out] Pointer to a variable that receives current demodulator mode. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets relative center frequency of demodulator for given channel.
C/C++ declaration
BOOL __stdcall SetDemodulatorFrequency(INT32 hDevice,UINT32 Channel,INT32 Frequency);
Address retrieval
G33DDC_SET_DEMODULATOR_FREQUENCY SetDemodulatorFrequency=
(G33DDC_SET_DEMODULATOR_FREQUENCY)GetProcAddress(hAPI,"SetDemodulatorFrequency");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Frequency[in] Specifies new center frequency of the demodulator in Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Value of the Frequency parameter is center frequency of the demodulator relative to center of the DDC2. The value can be negative.
Absolute frequency of the demodulator is given by the following formula:
faDEM[i] = fDDC1 + frDDC2[i] + frDEM[i]
Where faDEM[i] is absolute center frequency of the demodulator of i-th channel in Hz, fDDC1 is center frequency of the DDC1 in Hz (set using the SetDDC1Frequency function), frDDC2[i] is relative center frequency of DDC2 of i-th channel in Hz (set using the SetDDC2Frequency) and frDEM[i] is relative center frequency of the demodulator of i-th channel in Hz (set using SetDemodulatorFrequency).
Absolute center frequency of the demodulator is the real-world frequency that you are listening to.
Use the GetDemodulatorFrequency function to determine current relative center frequency of the demodulator for given channel.
The following example shows four methods how it is possible to set absolute demodulator center frequency of channel 0 to 11.01 MHz:
INT32 hDevice; //Handle to G33DDC device returned by the OpenDevice function //1. method SetDDC1Frequency(hDevice,11010000); SetDDC2Frequency(hDevice,0,0); SetDemodulatorFrequency(hDevice,0,0); //2. method SetDDC1Frequency(hDevice,11000000); SetDDC2Frequency(hDevice,0,10000); SetDemodulatorFrequency(hDevice,0,0); //3. method SetDDC1Frequency(hDevice,11020000); SetDDC2Frequency(hDevice,0,-5000); SetDemodulatorFrequency(hDevice,0,-5000); //4. method SetFrequency(hDevice,0,11010000); //The SetFrequency function sets DDC1, DDC2 and demodulator //center frequencies so that demodulator's absolute frequency is set to the required frequency
Retrieves current relative center frequency of the demodulator for given channel.
C/C++ declaration
BOOL __stdcall GetDemodulatorFrequency(INT32 hDevice,UINT32 Channel,INT32 *Frequency);
Address retrieval
G33DDC_GET_DEMODULATOR_FREQUENCY GetDemodulatorFrequency=
(G33DDC_GET_DEMODULATOR_FREQUENCY)GetProcAddress(hAPI,"GetDemodulatorFrequency");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Frequency[out] Pointer to a variable that receives current center frequency of the demodulator. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets a parameter of the demodulation for given channel.
C/C++ declaration
BOOL __stdcall SetDemodulatorParam(INT32 hDevice,UINT32 Channel,UINT32 Code,CONST VOID *Buffer,UINT32 BufferSize);
Address retrieval
G33DDC_SET_DEMODULATOR_PARAM SetDemodulatorParam=
(G33DDC_SET_DEMODULATOR_PARAM)GetProcAddress(hAPI,"SetDemodulatorParam");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Code[in] Specifies code of the demodulator parameter to be set by the function. The code can be one of the following:
Value Meaning G3XDDC_DEMODULATOR_PARAM_AMS_SIDE_BAND Side band for synchronous AM demodulation.
The Buffer parameter has to be pointer to an UINT32 variable, and the BufferSize parameter has to be sizeof(UINT32).
Value of the variable pointed to by the Buffer parameter can be one of the following:
G3XDDC_SIDE_BAND_LOWER
AMS demodulator will use lower sidebandG3XDDC_SIDE_BAND_UPPER
AMS demodulator will use upper sidebandG3XDDC_SIDE_BAND_BOTH
AMS demodulator will use both side bands.G3XDDC_DEMODULATOR_PARAM_AMS_CAPTURE_RANGE Capture range of synchronous AM demodulator.
The Buffer parameter has to be pointer to a G3XDDC_AMS_CAPTURE_RANGE structure, and the BufferSize parameter has to be sizeof(G3XDDC_AMS_CAPTURE_RANGE).
G3XDDC_DEMODULATOR_PARAM_CW_FREQUENCY CW tone frequency
The Buffer parameter has to be pointer to a INT32 variable, and the BufferSize parameter has to be sizeof(INT32).
Value of the variable pointed to by the Buffer parameter is CW tone frequency in Hz.
G3XDDC_DEMODULATOR_PARAM_DSB_SIDE_BAND Side band for DSB demodulation.
The Buffer parameter has to be pointer to an UINT32 variable, and the BufferSize parameter has to be sizeof(UINT32).
Value of the variable pointed to by the Buffer parameter can be one of the following:
G3XDDC_SIDE_BAND_LOWER
DSB demodulator will use lower sidebandG3XDDC_SIDE_BAND_UPPER
DSB demodulator will use upper sidebandG3XDDC_SIDE_BAND_BOTH
DSB demodulator will use both side bands.G3XDDC_DEMODULATOR_PARAM_ISB_SIDE_BAND Side band for ISB demodulation.
The Buffer parameter has to be pointer to an UINT32 variable, and the BufferSize parameter has to be sizeof(UINT32).
Value of the variable pointed to by the Buffer parameter can be one of the following:
G3XDDC_SIDE_BAND_LOWER
ISB demodulator will use lower sidebandG3XDDC_SIDE_BAND_UPPER
ISB demodulator will use upper sidebandG3XDDC_SIDE_BAND_BOTH
ISB demodulator will use both side bands.G3XDDC_DEMODULATOR_PARAM_DRM_AUDIO_SERVICE Audio service of DRM demodulator/decoder to be listening to.
The Buffer parameter has to be pointer to an UINT32 variable, and the BufferSize parameter has to be sizeof(UINT32).
Value of the variable pointed to by the Buffer parameter is index of the audio service. Possible value are: 1, 2, 3, 4, where 1 is the first audio service, 2 is the second one, etc. Use the GetDemodulatorState function with G3XDDC_DEMODULATOR_STATE_DRM_STATUS to retrieve information about available audio services for currently received DRM station.
G3XDDC_DEMODULATOR_PARAM_DRM_MULTIMEDIA_SERVICE Multimedia service of DRM demodulator/decoder to be decoded.
The Buffer parameter has to be pointer to an UINT32 variable, and the BufferSize parameter has to be sizeof(UINT32).
Value of the variable pointed to by the Buffer parameter is index of the multimedia service. Possible value are: 1, 2, 3, 4, where 1 is the first audio service, 2 is the second one, etc. Use the GetDemodulatorState function with G3XDDC_DEMODULATOR_STATE_DRM_STATUS to retrieve information about available multimedia services for currently received DRM station.
It is required that DRM multimedia player has to be installed to display multimedia content. It is included in G33DDC software installer as optional.
Buffer[in] Pointer to a buffer containing value of the demodulator parameter the function will set. This parameter cannot be NULL.BufferSize[in] Specifies the size of the buffer.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves a parameter of the demodulation for given channel.
C/C++ declaration
BOOL __stdcall GetDemodulatorParam(INT32 hDevice,UINT32 Channel,UINT32 Code,VOID *Buffer,UINT32 BufferSize);
Address retrieval
G33DDC_GET_DEMODULATOR_PARAM GetDemodulatorParam=
(G33DDC_GET_DEMODULATOR_PARAM)GetProcAddress(hAPI,"GetDemodulatorParam");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Code[in] Specifies code of the demodulator parameter to be retrieved. For detailed information about available codes see SetDemodulatorParam.Buffer[out] Pointer to a buffer that receives requested parameter. This parameter cannot be NULL.BufferSize[in] Specifies the size of the buffer.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Retrieves information about current demodulator state for given channel.
C/C++ declaration
BOOL __stdcall GetDemodulatorState(INT32 hDevice,UINT32 Channel,UINT32 Code,VOID *Buffer,UINT32 BufferSize);
Address retrieval
G33DDC_GET_DEMODULATOR_STATE GetDemodulatorState=
(G33DDC_GET_DEMODULATOR_STATE)GetProcAddress(hAPI,"GetDemodulatorState");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Code[in] Specifies code of the demodulator state to be retrieved. It can be one of the following:
Value Meaning G3XDDC_DEMODULATOR_STATE_AMS_LOCK Lock state of synchronous AM demodulation.
The Buffer parameter has to be pointer to a BOOL variable, and the BufferSize parameter has to be sizeof(BOOL).
Received value is non-zero if synchronous AM demodulator is locked to signal, and zero if it is not locked.
G3XDDC_DEMODULATOR_STATE_AMS_FREQUENCY Frequency in Hz which synchronous AM demodulator is locked to. It is relative to center of the demodulator. It can be negative.
The Buffer parameter has to be pointer to a double variable, and the BufferSize parameter has to be sizeof(double).
G3XDDC_DEMODULATOR_STATE_AM_DEPTH Depth of AM modulation in %.
The Buffer parameter has to be pointer to a double variable, and the BufferSize parameter has to be sizeof(double).
G3XDDC_DEMODULATOR_STATE_DSB_LOCK Lock state of DSB demodulation.
The Buffer parameter has to be pointer to a BOOL variable, and the BufferSize parameter has to be sizeof(BOOL).
Received value is non-zero if DSB demodulator is locked to signal, and zero if it is not locked.
G3XDDC_DEMODULATOR_STATE_DSB_FREQUENCY Frequency in Hz which DSB demodulator is locked to. It is relative to center of the demodulator. It can be negative.
The Buffer parameter has to be pointer to a double variable, and the BufferSize parameter has to be sizeof(double).
G3XDDC_DEMODULATOR_STATE_TUNE_ERROR Estimated tune error in Hz.
The Buffer parameter has to be pointer to an INT32 variable, and the BufferSize parameter has to be sizeof(INT32).
Received value is difference between demodulator frequency and frequency of received signal. Subtract the returned tune error from demodulator frequency to get frequency of the received signal. Tune error is relative to center of the demodulator and it can be negative.
G3XDDC_DEMODULATOR_STATE_DRM_STATUS Status of DRM demodulator/decoder.
The Buffer parameter has to be pointer to a G3XDDC_DRM_STATUS structure, and the BufferSize parameter has to be sizeof(G3XDDC_DRM_STATUS).
G3XDDC_DEMODULATOR_STATE_FM_DEVIATION Estimated frequency deviation in Hz.
The Buffer parameter has to be pointer to an UINT32 variable, and the BufferSize parameter has to be sizeof(UINT32).
Buffer[out] Pointer to a buffer that receives requested information. This parameter cannot be NULL.BufferSize[in] Specifies the size of the buffer.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Starts audio streaming for given channel.
C/C++ declaration
BOOL __stdcall StartAudio(INT32 hDevice,UINT32 Channel,UINT32 SamplesPerBuffer);
Address retrieval
G33DDC_START_AUDIO StartAudio=(G33DDC_START_AUDIO)GetProcAddress(hAPI,"StartAudio");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.SamplesPerBuffer[in] Specifies number of samples in each buffer passed to the AudioStreamCallback callback function. The value has to be multiple of 64 greater than zero. If it is zero, the StartAudio function fails. If it is not multiple of 64 the function rounds it up to nearest multiple of 64.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Before StartAudio is used, the G33DDC device has to be turned on using the SetPower function and DDC1 streaming has to be started using the StartDDC1 or StartDDC1Playback function and DDC2 streaming has to be started using the StartDDC2 function, otherwise StartAudio fails.
If the audio streaming for given channel is already running, StartAudio restarts it except the streaming was previously started with the same SamplesPerBuffer parameter. In this case StartAudio does nothing.
Use the StopAudio function to stop audio streaming.
Decreasing value of the SamplesPerBuffer parameter decreases latency and it may increase CPU usage. Increasing value of the SamplesPerBuffer parameter increased latency and it may decrease CPU usage.
Stops audio streaming for given channel.
C/C++ declaration
BOOL __stdcall StopAudio(INT32 hDevice,UINT32 Channel);
Address retrieval
G33DDC_STOP_AUDIO StopAudio=(G33DDC_STOP_AUDIO)GetProcAddress(hAPI,"StopAudio");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If audio streaming is not active, StopAudio does nothing.
If audio playback (started using the StartAudioPlayback function) is active, StopAudio stops it.
The AudioStreamCallback and AudioPlaybackStreamCallback callback functions are not called after StopAudio returns.
Starts audio playback for given channel. It allows to pass previously recorded audio samples to the processing chain instead of the samples from the demodulator.
C/C++ declaration
BOOL __stdcall StartAudioPlayback(INT32 hDevice,UINT32 Channel,UINT32 SamplesPerBuffer);
Address retrieval
G33DDC_START_AUDIO_PLAYBACK StartAudioPlayback=(G33DDC_START_AUDIO_PLAYBACK)GetProcAddress(hAPI,"StartAudioPlayback");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.SamplesPerBuffer[in] Specifies number of samples in each buffer passed to the AudioPlaybackStreamCallback callback to fill the buffer by the application and to the AudioStreamCallback callback function. The value has to be multiple of 64 greater than zero. If it is zero, the StartAudioPlayback function fails. If it is not multiple of 64 the function rounds it up to nearest multiple of 64.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The G33DDC device has to be turned on using SetPower function before use of StartAudioPlayback.
The StartAudioPlayback function stops audio streaming that was previously started by the StartAudio or StartAudioPlayback function and starts audio playback with new parameters.
Use the StopAudio function to stop audio playback.
Pauses audio playback for given channel.
C/C++ declaration
BOOL __stdcall PauseAudioPlayback(INT32 hDevice,UINT23 Channel);
Address retrieval
G33DDC_PAUSE_AUDIO_PLAYBACK PauseAudioPlayback=(G33DDC_PAUSE_AUDIO_PLAYBACK)GetProcAddress(hAPI,"PauseAudioPlayback");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If audio playback is not active or it is already paused, PauseAudioPlayback does nothing.
The AudioPlaybackStreamCallback and AudioStreamCallback callback functions can be called once after PauseAudioPlayback returns. Then they are not called until playback is resumed using the ResumeAudioPlayback function.
Resumes paused audio playback for given channel.
C/C++ declaration
BOOL __stdcall ResumeAudioPlayback(INT32 hDevice,UINT32 Channel);
Address retrieval
G33DDC_RESUME_AUDIO_PLAYBACK ResumeAudioPlayback=(G33DDC_RESUME_AUDIO_PLAYBACK)GetProcAddress(hAPI,"ResumeAudioPlayback");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If audio playback is not active or it is not paused, ResumeAudioPlayback does nothing.
Sets fixed audio gain for given channel.
C/C++ declaration
BOOL __stdcall SetAudioGain(INT32 hDevice,UINT32 Channel,double Gain);
Address retrieval
G33DDC_SET_AUDIO_GAIN SetAudioGain=(G33DDC_SET_AUDIO_GAIN)GetProcAddress(hAPI,"SetAudioGain");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Gain[in] Specifies new fixed audio gain in dB.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetAudioGain function to retrieve current audio gain.
Retrieves current fixed audio gain for given channel.
C/C++ declaration
BOOL __stdcall GetAudioGain(INT32 hDevice,UINT32 Channel,double *Gain);
Address retrieval
G33DDC_GET_AUDIO_GAIN GetAudioGain=(G33DDC_GET_AUDIO_GAIN)GetProcAddress(hAPI,"GetAudioGain");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Gain[out] Pointer to a variable that receives current fixed gain in dB. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Enabled or disables audio filter for given channel.
C/C++ declaration
BOOL __stdcall SetAudioFilter(INT32 hDevice,UINT32 Channel,BOOL Enabled);
Address retrieval
G33DDC_SET_AUDIO_FILTER SetAudioFilter=(G33DDC_SET_AUDIO_FILTER)GetProcAddress(hAPI,"SetAudioFilter");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Enabled[in] Specifies whether to enable or disable audio filter. If this parameter is non-zero, the filter is enabled. If the parameter is zero, the filter is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetAudioFiler function to retrieve current state of the audio filter.
Retrieves current state of the audio filter for given channel.
C/C++ declaration
BOOL __stdcall GetAudioFilter(INT32 hDevice,UINT32 Channel,BOOL *Enabled);
Address retrieval
G33DDC_GET_AUDIO_FILTER GetAudioFilter=(G33DDC_GET_AUDIO_FILTER)GetProcAddress(hAPI,"GetAudioFilter");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Enabled[out] Pointer to a variable that receives current state of the audio filter. The value is non-zero if the filter is enabled and zero if it is disabled. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets parameters of the audio filter for given channel.
C/C++ declaration
BOOL __stdcall SetAudioFilterParams(INT32 hDevice,UINT32 Channel,UINT32 CutOffLow,UINT32 CutOffHigh,double Deemphasis);
Address retrieval
G33DDC_SET_AUDIO_FILTER_PARAMS SetAudioFilterParams=
(G33DDC_SET_AUDIO_FILTER_PARAMS)GetProcAddress(hAPI,"SetAudioFilterParams");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.CutOffLow[in] Specifies cut-off low frequency of the filter in Hz. This is the start frequency of filter's passband, it can be from range 0 to 23999 Hz. The value has to be less then the cut-off high frequency specified by the CutOffHigh parameter.CutOffHigh[in] Specifies cut-off high frequency of the filter in Hz. This is the end frequency of filter's passband it can be from range 1 - 24000 Hz. The value has to be greater than the cut-off low frequency specified by the CutOffLow parameter.Deemphasis[in] Specifies de-emphasis the filter in dB per octave. De-emphasis starts at cut-off low frequency of the filter. This value can be from range -9.9 to 0.0 dB/octave. Zero means the de-emphasis is disabled.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Use the GetAudioFilerParams function to retrieve current parameters of the audio filter.
Retrieves current parameters of the audio filter for given channel.
C/C++ declaration
BOOL __stdcall GetAudioFilterParams(INT32 hDevice,UINT32 Channel,UINT32 *CutOffLow,UINT32 *CutOffHigh,double *Deemphasis);
Address retrieval
G33DDC_GET_AUDIO_FILTER_PARAMS GetAudioFilterParams=
(G33DDC_GET_AUDIO_FILTER_PARAMS)GetProcAddress(hAPI,"GetAudioFilterParams");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.CutOffLow[out] Pointer to a variable that receives current cut-off low frequency of the filter. This parameter can be NULL if the application does not require this information.CutOffHigh[out] Pointer to a variable that receives current cut-off high frequency of the filter. This parameter can be NULL if the application does not require this information.Deemphasis[out] Pointer to a variable that receives current de-emphasis setting of the filter. This parameter can be NULL if the application does not require this information.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Specifies audio filter length for given channel. The audio filter is implemented as FIR filter. This function specifies number of coefficients used in filtration procedure.
C/C++ declaration
BOOL __stdcall SetAudioFilterLength(INT32 hDevice,UINT32 Channel,UINT32 Length);
Address retrieval
G33DDC_SET_AUDIO_FILTER_LENGTH SetAudioFilterLength=
(G33DDC_SET_AUDIO_FILTER_LENGTH)GetProcAddress(hAPI,"SetAudioFilterLength");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Length[in] Specifies length of the audio filter. The value has to be multiple of 64, greater than or equal to 64 and less than or equal to 32768. If it is not multiple of 64 the function rounds it up to nearest multiple of 64.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Increasing the filter length increases filter steepness and it may increase CPU usage.
Use the GetAudioFilterLength function to determine current length of the audio filter.
Retrieves current audio filter length for given channel.
C/C++ declaration
BOOL __stdcall GetAudioFilterLength(INT32 hDevice,UINT32 Channel,UINT32 *Length);
Address retrieval
G33DDC_GET_AUDIO_FILTER_LENGTH GetAudioFilterLength=
(G33DDC_GET_AUDIO_FILTER_LENGTH)GetProcAddress(hAPI,"GetAudioFilterLength");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Length[out] Pointer to a variable that receives current length of the audio filter. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Sets absolute frequency of the demodulator for given channel.
C/C++ declaration
BOOL __stdcall SetFrequency(INT32 hDevice,UINT32 Channel,UINT32 Frequency);
Address retrieval
G33DDC_SET_FREQUENCY SetFrequency=(G33DDC_SET_FREQUENCY)GetProcAddress(hAPI,"SetFrequency");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Frequency[in] Specifies new absolute frequency of the demodulator in Hz.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The function sets DDC1, DDC2 and demodulator frequencies so that new absolute frequency of the demodulator is the required one.
Absolute frequency of the demodulator is given by the following formula:
faDEM[i] = fDDC1 + frDDC2[i] + frDEM[i]
Where faDEM[i] is absolute center frequency of the demodulator of i-th channel in Hz, fDDC1 is center frequency of the DDC1 in Hz (set using the SetDDC1Frequency function), frDDC2[i] is relative center frequency of DDC2 of i-th channel in Hz (set using the SetDDC2Frequency) and frDEM[i] is relative center frequency of the demodulator of i-th channel in Hz (set using the SetDemodulatorFrequency function).
Absolute center frequency of the demodulator is the real-world frequency that you are listening to.
Use the GetFrequency function to retrieve current absolute frequency of the demodulator.
Determines absolute frequency of the demodulator for given channel.
C/C++ declaration
BOOL __stdcall GetFrequency(INT32 hDevice,UINT32 Channel,UINT32 *Frequency);
Address retrieval
G33DDC_GET_FREQUENCY GetFrequency=(G33DDC_GET_FREQUENCY)GetProcAddress(hAPI,"GetFrequency");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Channel[in] Specifies channel index. Possible values are: 0, 1, 2.Frequency[out] Pointer to a variable that receives current absolute frequency of the demodulator. This parameter cannot be NULL.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
Returned value of the variable pointed to by the Frequency parameter is sum of DDC1, DDC2 and demodulator relative frequency. For more information, see remarks of the SetFrequency function.
Determines compensation data for frequency spectrum computed from DDC1 or DDC2 signal. It is used to convert relative amplitudes in dB to absolutes ones in dBm.
C/C++ declaration
BOOL __stdcall GetSpectrumCompensation(INT32 hDevice,UINT64 CenterFrequency,UINT32 Width,FLOAT *Buffer,UINT32 Count);
Address retrieval
G33DDC_GET_SPECTRUM_COMPENSATION GetSpectrumCompensation=
(G33DDC_GET_SPECTRUM_COMPENSATION)GetProcAddress(hAPI,"GetSpectrumCompensation");Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.CenterFrequency[in] Specifies absolute center frequency of requested compensation data in Hz.Width[in] Specifies width of requested compensation data in Hz.Buffer[out] Pointer to a buffer to be filled with compensation data. This parameter cannot be NULL.Count[in] Specifies number of FLOAT items in the buffer pointed to by the Buffer parameter.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
The following example shows how to use the GetSpectrumCompensation function in DDC2StreamCallback callback function:
//Let the following is prototype of a function which computes FFT from I/Q signal stored in //the buffer pointed to be the Input parameter. Result is stored in complex form in the buffer //pointed to by the Output parameter. Size of the FFT is given be the Size parameter. //The example uses 2048 bins FFT. void FFT(float *Output,const float *Input,int Size); INT32 hDevice; //handle to G33DDC device UINT32 AbsDDC2Frequency; //Absolute frequency of the DDC2 INT32 RelDDC2Frequency; //Relative frequency of the DDC2 UINT32 DDC1Frequency; //DDC1 frequency G3XDDC_DDC_INFO DDC2Info; //Information about current DDC type of the DDC2 FLOAT FFTBuffer[2*2048]; //Buffer for FFT result FLOAT Compensation[2048]; //Buffer for compensation data UINT32 FirstBin,LastBin; //the first and last bins in the FFT of useful DDC2 band G33DDC_CALLBACKS Callbacks; //Structure which contains pointer to callback functions Code before... //Retrieve frequency of the DDC1 GetDDC1Frequency(hDevice,&DDC1Frequency); //Retrieve relative frequency of the DDC2 for channel 0 GetDDC2Frequency(hDevice,0,&RelDDC2Frequency); //Calculate absolute frequency of the DDC2 AbsDDC2Frequency=(INT32)DDC1Frequency+RelDDC2Frequency; //Retrieve DDC type information of the DDC2 GetDDC2(hDevice,NULL,&DDC2Info); //Retrieve compensation data GetSpectrumCompensation(hDevice,AbsDDC2Frequency,DDC2Info.SampleRate,Compensation,2048); //In this case the Width parameter is equal to sample rate, because we need compensation data //for whole DDC2 band. //Compensation data have to be updated after change of absolute DDC2 frequency using //the SetDDC1Frequency or SetDDC2Frequency function. //In this case a mutual-exclusion synchronization method (for example critical section) should be used //if the Compensation buffer would be modified outside the MyDDC2StreamCallback callback. FirstBin=2048*(DDC2Info.SampleRate-DDC2Info.Bandwidth)/2/DDC2Info.SampleRate; LastBin=2048*(DDC2Info.SampleRate+DDC2Info.Bandwidth)/2/DDC2Info.SampleRate; //Set callback function for DDC2 streaming //Pointers to callback function which should not be called by the API have to be set to NULL. Callbacks.DDC2StreamCallback=MyDDC2StreamCallback; //Start DDC2 streaming for channel 0 //The SamplesPerBuffer parameter is set to 2048 which is size of the FFT to simplify //the example. StartDDC2(hDevice,0,2048); Code after... void __stdcall MyDDC2StreamCallback(UINT32 Channel,CONST FLOAT *Buffer,UINT32 NumberOfSamples,DWORD_PTR UserData) { UINT32 i; //Compute FFT FFT(FFTBuffer,Buffer,2048); //Converts complex FFT result to dB for(i=0;i<2048;i++) { FFTBuffer[i]=(FLOAT)(10.0*log10(FFTBuffer[i*2]*FFTBuffer[i*2]+FFTBuffer[i*2+1]*FFTBuffer[i*2+1])); } //Apply compensation data to get amplitudes in frequency spectrum in dBm for(i=0;i<2048;i++) { FFTBuffer[i]+=Compensation[i]; } //now the FFTBuffer contains amplitudes in dBm //Useful band starts at the bin given by the FirstBin variable //and ends at the bin given by the LastBin variable. }
Registers user-defined functions as callback functions called by the API.
C/C++ declaration
BOOL __stdcall SetCallbacks(INT32 hDevice,CONST G33DDC_CALLBACKS *Callbacks,DWORD_PTR UserData);
Address retrieval
G33DDC_SET_CALLBACKS SetCallbacks=(G33DDC_SET_CALLBACKS)GetProcAddress(hAPI,"SetCallbacks");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.Callbacks[in] Pointer to a G33DDC_CALLBACKS structure which contains pointers to the user-defined function to be registered as callback functions.UserData[in] Specifies a user-defined value which is passed to callback functions.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If the application does not require that the API calls some callback function, set related member of the G33DDC_CALLBACKS structure to NULL.
If value of the Callbacks parameter is NULL, all the callback functions are unregistered, the API will not call any callback function.
Sets directory with DRM key file to unlock DRM demodulator/decoder.
C/C++ declaration
BOOL __stdcall SetDRMKey(INT32 hDevice,CONST CHAR *DRMKeyFileDirectory);
Address retrieval
G33DDC_SET_DRM_KEY SetDRMKey=(G33DDC_SET_DRM_KEY)GetProcAddress(hAPI,"SetDRMKey");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.DRMKeyFileDirectory[in] Pointer to a null-terminated string that specifies the directory which contains valid DRM key file.
Return value
If the function succeeds, the return value is non-zero.
If the function fails, the return value is zero. To get extended error information, call GetLastError.
Remarks
If the specfied directory contains valid DRM key file, the key is loaded and the DRM demodulator/decoder is unlocked and available for use, otherwise the function fails.
If the DRM demodulator/decoder is already unlocked, the function does nothing.
Use the IsDRMUnlocked function to determine whether DRM demodulator/decoder is unlocked or not.
Information about obtaining DRM key at https://www.winradio.com/home/drm.htm.
Determined whether DRM demodulator/decoder is unlocked or not.
C/C++ declaration
BOOL __stdcall IsDRMUnlocked(INT32 hDevice);
Address retrieval
G33DDC_IS_DRM_UNLOCKED IsDRMUnlocked=(G33DDC_IS_DRM_UNLOCKED)GetProcAddress(hAPI,"IsDRMUnlocked");
Parameters
hDevice[in] Handle to G33DDC device returned by the OpenDevice function.
Return value
If the function succeeds and the DRM demodulator/decoder is unlocked, the return value is non-zero.
If the function fails or the DRM demodulator/decoder is locked, the return value is zero. To get extended error information, call GetLastError.
Contains information about G33DDC device.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
CHAR DevicePath[MAX_PATH];
BYTE InterfaceType;
CHAR SerialNumber[9];
UINT32 ChannelCount;
UINT32 DDCTypeCount;
} G33DDC_DEVICE_INFO;
#pragma pack(pop
Members
DevicePathDevice system path in a null-terminated string. It is used to open the device using object interface.InterfaceTypeDevice interface type. The value can be one of the following:
G3XDDC_INTERFACE_TYPE_PCIE
The device is connected to the computer via PCI express.G3XDDC_INTERFACE_TYPE_USB
The device is connected to the computer via USB.SerialNumberSerial number in null-terminated string.ChannelCountNumber of channels.DDCTypeCountNumber of DDC types supported by the DDC1.
Contains information about DDC type.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
UINT32 SampleRate;
UINT32 Bandwidth;
UINT32 BitsPerSample;
} G3XDDC_DDC_INFO;
#pragma pack(pop)
Members
SampleRateSample rate of I/Q signal in Hz.BandwidthUseful bandwidth in Hz.BitsPerSampleNumber of bits per sample. It can be 16 or 32. It is used to determine bits per sample for DDC1.
Contains information about AMS capture range.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
UINT32 Tune;
UINT32 Lock;
} G3XDDC_AMS_CAPTURE_RANGE;
#pragma pack(pop)
Members
TuneInitial capture range in Hz.LockCapture range (in Hz) used when AMS demodulator is locked.
Contains pointers to user-defined functions to be registered as callback functions.
Each callback function is called in context of thread created by the API. If some shared data are accessed inside callback functions, it is recommended to use a mutual-exclusion synchronization method. The application should not call any G33DDC API function from inside callback functions, otherwise it can cause deadlock or the application can become to unpredictable state.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
G33DDC_IF_CALLBACK IFCallback;
G33DDC_DDC1_STREAM_CALLBACK DDC1StreamCallback;
G33DDC_DDC1_PLAYBACK_STREAM_CALLBACK DDC1PlaybackStreamCallback;
G33DDC_DDC2_STREAM_CALLBACK DDC2StreamCallback;
G33DDC_DDC2_PREPROCESSED_STREAM_CALLBACK DDC2PreprocessedStreamCallback;
G33DDC_AUDIO_STREAM_CALLBACK AudioStreamCallback;
G33DDC_AUDIO_PLAYBACK_STREAM_CALLBACK AudioPlaybackStreamCallback;
} G33DDC_CALLBACKS;
#pragma pack(pop)
Members
Pointer to a user-defined function to be registered as IF callback. It is called by the API to pass IF snapshots to the application. Sending of IF snapshots is started using the StartIF function.
C/C++ declaration
VOID __stdcall IFCallback(CONST SHORT *Buffer,UINT32 NumberOfSamples,WORD MaxADCAmplitude,UINT32 ADCSamplingRate,DWORD_PTR UserData);Parameters
BufferPointer to the buffer which contains samples directly received from ADC. Sample rate is 100 MHz, sample is 16bit signed little endian.NumberOfSamplesSpecifies number of samples in the buffer pointed to be the Buffer parameter. This is usually 65536.MaxADCAmplitudeSpecifies maximum amplitude. Measurement of the maximum is started at the end of the previous snapshot to the current one. The possible value is 0 to 32767.ADCSamplingRateSpecifies sample rate of the ADC in Hz. It can vary a little bit because of temperature instability.UserDataUser-defined data. It is value passed to the SetCallbacks function as the UserData parameter.Pointer to a user-defined function to be registered as DDC1 stream callback. It is called by the API to pass I/Q samples from DDC1 to the application. The DDC1 streaming can be started using the StartDDC1 or StartDDC1Playback function.
C/C++ declaration
VOID __stdcall DDC1StreamCallback(CONST VOID *Buffer,UINT32 NumberOfSamples,UINT32 BitsPerSample,DWORD_PTR UserData);Parameters
BufferPointer to the buffer which contains I/Q sample sets from DDC1. Sample rate and bits per sample is given by used DDC type, see the SetDDC1 function. One I/Q sample set consists of two samples.NumberOfSamplesSpecifies number of I/Q sample sets in the buffer pointed to by the Buffer parameter. This value is equal to value of the SamplesPerBuffer parameter of the StartDDC1 or StartDDC1Playback function.BitsPerSampleSpecifies number of bits per sample. It is given by DDC type used for DDC1 and it can be 16 or 32. If it is 16, sample is 16bit integer (32bits per I/Q sample set), signed, little endian, from range -32768 to 32767. If it is 32, sample is 32bit integer (64bits per I/Q sample set), signed, little endian, from range -2147483648 to 2147483647.UserDataUser-defined data. It is value passed to the SetCallbacks function as the UserData parameter.Pointer to a user-defined function to be registered as DDC1 playback stream callback. It is called by the API to fill the buffer with I/Q samples by the applcation. The DDC1 playback can be started using the StartDDC1Playback function.
C/C++ declaration
BOOL __stdcall DDC1PlaybackStreamCallback(VOID *Buffer,UINT32 NumberOfSamples,UINT32 BitsPerSample,DWORD_PTR UserData);Parameters
BufferPointer to the buffer to be filled with I/Q sample sets. Sample rate and bits per sample is given by used DDC type, see the SetDDC1 function.NumberOfSamplesSpecifies number of I/Q sample sets to be stored to the buffer pointed to by the Buffer parameter. This value is equal to value of the SamplesPerBuffer parameter of the StartDDC1Playback function. If the application does not have requested number of sample sets, it has to fill the buffer with zeros. One I/Q sample set consists of two samples.BitsPerSampleSpecifies number of bits per sample. It is given by DDC type used for DDC1 and it can be 16 or 32. If it is 16, sample is 16bit integer (32bits per I/Q sample set), signed, little endian, from range -32768 to 32767. If it is 32, sample is 32bit integer (64bits per I/Q sample set), signed, little endian, from range -2147483648 to 2147483647.UserDataUser-defined data. It is value passed to the SetCallbacks function as the UserData parameter.Return value
The application should return non-zero to continue playback. The application should return zero to stop the API to call DDC1PlaybackStreamCallback again. This does not stop DDC1 playback, it has to be done explicitly by the application calling the StopDDC1 function from the thread in which the device was open using the OpenDevice function. StopDDC1 must not be called from inside the callback function.Pointer to a user-defined function to be registered as DDC2 stream callback. It is called by the API to pass I/Q samples from DDC2 to the application. The DDC2 streaming can be started using the StartDDC2 function.
C/C++ declaration
VOID __stdcall DDC2StreamCallback(UINT32 Channel,CONST FLOAT *Buffer,UINT32 NumberOfSamples,DWORD_PTR UserData);Parameters
ChannelSpecifies channel index. It can be 0, 1, 2.BufferPointer to the buffer which contains I/Q sample sets from DDC2. Sample rate is given by the DDC type of the DDC2. Use the GetDDC2 function to determine current DDC type of the DDC2. Sample is 32bit IEEE float from range -1.0 to 1.0. One I/Q sample set consists of two samples.NumberOfSamplesSpecifies number of I/Q sample sets in the buffer pointed to by the Buffer parameter. This value is equal to value of the SamplesPerBuffer parameter of the StartDDC2 function.UserDataUser-defined data. It is value passed to the SetCallbacks function as the UserData parameter.Pointer to a user-defined function to be registered as preprocessed DDC2 stream callback. It is called by the API to pass preprocessed I/Q samples from DDC2 to the application. The samples are filtered by the demodulator filter, notch filter and affected by AGC or fixed gain. The DDC2 streaming can be started using the StartDDC2 function.
C/C++ declaration
VOID __stdcall DDC2PreprocessedStreamCallback(UINT32 Channel,CONST FLOAT *Buffer,UINT32 NumberOfSamples, FLOAT SlevelPeak,FLOAT SlevelRMS,DWORD_PTR UserData);Parameters
ChannelSpecifies channel index. It can be 0, 1, 2.BufferPointer to the buffer which contains preprocessed I/Q sample sets from DDC2. Sample rate is given by the DDC type of the DDC2. Use the GetDDC2 function to determine current DDC type of the DDC2. Sample is 32bit IEEE float from range -1.0 to 1.0. One I/Q sample set consists of two samples.NumberOfSamplesSpecifies number of I/Q sample sets in the buffer pointed to by the Buffer parameter. This value is equal to value of the SamplesPerBuffer parameter of the StartDDC2 function.SlevelPeakSpecifies peak signal level in Volts evaluated from samples stored in the buffer pointed to by the Buffer parameter.SlevelRMSSpecifies RMS signal level in Volts evaluated from samples stored in the buffer pointed to by the Buffer parameter. For detailed information how to convert RMS signal level to dBm, see remarks of the GetSignalLevel function.UserDataUser-defined data. It is value passed to the SetCallbacks function as the UserData parameter.Pointer to a user-defined function to be registered as audio stream callback. It is called by the API to pass audio samples to the application. The audio streaming can be started using the StartAudio or StartAudioPlayback function.
C/C++ declaration
VOID __stdcall AudioStreamCallback(UINT32 Channel,CONST FLOAT *Buffer,CONST FLOAT *BufferFiltered, UINT32 NumberOfSamples,DWORD_PTR UserData);Parameters
ChannelSpecifies channel index. It can be 0, 1, 2.BufferPointer to the buffer which contains samples of audio signal. The signal is mono, sample rate is 48000 Hz, sample is 32bit IEEE float from range -1.0 to 1.0.BufferFilteredPointer to the buffer which contains samples of filtered audio signal. The signal is mono, sample rate is 48000 Hz, sample is 32bit IEEE float from range -1.0 to 1.0. If the audio filter is disabled, the samples in the buffer pointed to by the BufferFiltered are the same as the samples in the buffer pointed to by the Buffer parameter.NumberOfSamplesSpecifies number of samples to be stored in the buffer pointed to by the Buffer parameter. This value is equal to value of the SamplesPerBuffer parameter of the StartAudio or StartAudioPlayback function.UserDataUser-defined data. It is value passed to the SetCallbacks function as the UserData parameter.Pointer to a user-defined function to be registered as audio playback stream callback. It is called by the API to fill the buffer with audio samples by the application. The audio playback can be started using the StartAudioPlayback function.
C/C++ declaration
BOOL __stdcall AudioPlaybackStreamCallback(UINT32 Channel,FLOAT *Buffer,UINT32 NumberOfSamples,DWORD_PTR UserData);Parameters
ChannelSpecifies channel index. It can be 0, 1, 2.BufferPointer to the buffer to by filled with audio samples. The audio signal is mono, sample rate is 48000 Hz, sample is 32bit IEEE float from range -1.0 to 1.0.NumberOfSamplesSpecifies number of samples in the buffer pointed to by the Buffer parameter. This value is equal to value of the SamplesPerBuffer parameter of the StartAudioPlayback function. If the application does not have requested number of samples, the application has to fill the buffer with zeros.UserDataUser-defined data. It is value passed to the SetCallbacks function as the UserData parameter.Return value
The application should return non-zero to continue playback. The application should return zero to stop the API to call AudioPlaybackStreamCallback again. This does not stop audio playback, it has to be done explicitly by the application calling the StopAudio function from the thread in which the device was open using the OpenDevice function. StopAudio must not be called from inside the callback function.
Contains information about DRM demodulator/decoder status.
C/C++ declaration
#pragma pack(push,1)
typedef struct
{
BOOL Valid;
struct
{
BOOL SyncFound;
BOOL FACDecoded;
BOOL SDCDecoded;
BOOL AudioDecoded;
SHORT NumberOfAudioFrames;
SHORT NumberOfAudioErrors;
} DecodingState;
INT32 Mode;
double RFBandwidth;
BYTE Interleaver;
SHORT SDCQam;
SHORT MSCQam;
BYTE MSCQamType;
double CoderateH;
double CoderateA;
double CoderateB;
double EstimatedSNR;
WCHAR TextMessage[128 + 1 + 16];
struct
{
BYTE Content;
WCHAR DynamicLabel[256];
WCHAR Country[256];
WCHAR Language[256];
WCHAR ProgramType[256];
double AudioBitrate;
double TextMsgBitrate;
double MultimediaBitrate;
double DataBitrate;
} ServiceInfo[4];
struct
{
BOOL Valid;
BYTE AudioCoding;
BOOL SBR;
INT32 AudioMode;
} AudioDecoderInfo[4];
} G3XDDC_DRM_STATUS;
#pragma pack(pop)
Members
ValidThe value is non-zero if content of the structure is valid. It is zero, if content of the structure is not valid.DecodingStateStructure that contains status of the decoder modules.
Members
SyncFoundStatus of the sync detection. It is non-zero if sync detected.FACDecodedStatus of the FAC decoder. It is non-zero if FAC decoded.SDCDecodedStatus of the SDC decoder. It is non-zero if SDC decoded.AudioDecodedStatus of the audio decoder. It is non-zero if audio decoded.NumberOfAudioFramesNumber of audio frames in the transmission frame. It is -1 if this information is not available.NumberOfAudioErrorsNumber of audio frames that were invalid.ModeUsed DRM robustness mode. It can be one of the following:
Value Meaning G3XDDC_DRM_STATE_MODE_NOT_DETERMINED_YET Robustness mode is not determined yet. G3XDDC_DRM_STATE_MODE_A Broadcast is using DRM robustness mode A. G3XDDC_DRM_STATE_MODE_B DRM robustness mode B. G3XDDC_DRM_STATE_MODE_C DRM robustness mode C. G3XDDC_DRM_STATE_MODE_D DRM robustness mode D. RFBandwidthOccupied RF bandwidth in kHz. It is zero if it is invalid or this information is not available (yet).InterleaverInterleaver length. It can be one of the following:
Value Meaning G3XDDC_DRM_STATE_INTERLEAVER_LONG Long interleaver used (2 sec). G3XDDC_DRM_STATE_INTERLEAVER_SHORT Short interleaver used (400 msec). SDCQamCoding of the SDC (QAM). It is zero if this information is not available (yet).MSCQamCoding of the MSC (QAM). It is zero if this information is not available (yet).MSCQamTypeUsed QAM coding for the MSC. It can be one of the following:
Value Meaning G3XDDC_DRM_STATE_QAM_TYPE_STD Standard G3XDDC_DRM_STATE_QAM_TYPE_HIER_SYM Hierarchical symmetrical G3XDDC_DRM_STATE_QAM_TYPE_HIER_MIX Hierarchical mixed CoderateHUsed code-rate for hierarchical coding, values less than or equal to zero indicate not available or not used.CoderateAUsed code-rate for protection level A, values less than or equal to zero indicate indicate not available or not used.CoderateBUsed code-rate for protection level B, values less than or equal to zero indicate indicate not available or not used.EstimatedSNREstimated SNR in dB of the decoded signal.TextMessageDecoded text message for the selected service in 16bit Unicode null-terminated string.ServiceInfoArray of four structures which contain general information on the services.
Members
ContentType of the service. It can be combination of the following:
Value Meaning G3XDDC_DRM_STATE_SERVICE_CONTENT_EMPTY Given service is not used, it contains no data, all other members of the structure are invalid. G3XDDC_DRM_STATE_SERVICE_CONTENT_AUDIO Given service contains audio data. G3XDDC_DRM_STATE_SERVICE_CONTENT_TEXTMSG Given service contains text messages. G3XDDC_DRM_STATE_SERVICE_CONTENT_MULTIMEDIA Given service contains multimedia data. G3XDDC_DRM_STATE_SERVICE_CONTENT_DATA Given service contains application specific data. DynamicLabel16bit Unicode null-terminated string containing dynamic label of the service.Country16bit Unicode null-terminated string containing the signaled country for this service.Language16bit Unicode null-terminated string containing the signaled language for this service.ProgramType16bit Unicode null-terminated string containing the signaled program type for this service.AudioBitrateData rate for the audio content. It is zero if this information is not available.TextMsgBitrateData rate for the text message content. It is zero if this information is not available.MultimediaBitrateData rate for the multimedia content. It is zero if this information is not available.DataBitrateData rate for the data content. It is zero if this information is not available.AudioDecoderInfoArray of four structures which contain audio decoder specific information on the services.
Members
ValidIf it is non-zero, audio decoder information are valid, if it is zero, audio decoder information are invalid and all other members of the structure contain no valid data.AudioCodingUsed audio coding. It can be one of the following:
Value Meaning G3XDDC_DRM_STATE_AUDIO_CODING_AAC Audio coding for given service is AAC. G3XDDC_DRM_STATE_AUDIO_CODING_CELP Audio coding for given service is CELP. G3XDDC_DRM_STATE_AUDIO_CODING_HVXC Audio coding for given service is HVXC. G3XDDC_DRM_STATE_AUDIO_CODING_RFU Reserved for future use. SBRIf it is non-zero, SBR is used, if it is zero, SBR is not used.AudioModeThe value depends on audio coding. It can be one of the following:
Value Meaning G3XDDC_DRM_STATE_AUDIO_MODE_AAC_MONO Mono G3XDDC_DRM_STATE_AUDIO_MODE_AAC_PARAM_STEREO Parametric stereo G3XDDC_DRM_STATE_AUDIO_MODE_AAC_STEREO Stereo G3XDDC_DRM_STATE_AUDIO_MODE_AAC_RFU Reserved for future use G3XDDC_DRM_STATE_AUDIO_MODE_CELP_NO_CRC Audio data is without CRC G3XDDC_DRM_STATE_AUDIO_MODE_CELP_CRC CRC used G3XDDC_DRM_STATE_AUDIO_MODE_CELP_RFU_10 Reserved for future use G3XDDC_DRM_STATE_AUDIO_MODE_CELP_RFU_11 Reserved for future use G3XDDC_DRM_STATE_AUDIO_MODE_HVXC_RFU_00 Reserved for future use G3XDDC_DRM_STATE_AUDIO_MODE_HVXC_RFU_01 Reserved for future use G3XDDC_DRM_STATE_AUDIO_MODE_HVXC_RFU_10 Reserved for future use G3XDDC_DRM_STATE_AUDIO_MODE_HVXC_RFU_11 Reserved for future use