How to create a hidden track at the beginning of audio CD - Part 2

void WriteToCD_HiddenTrack_With_User_Data_In_First_2seconds(char driveLetter)
{

       IEngine * engine = Library::CreateEngine();

       engine->Initialize();

       int deviceIndex = Library::GetCDROMIndexFromLetter(driveLetter);

       IDeviceEnum * devices = engine->GetDevices();

       IDevice* dev = devices->GetItem(deviceIndex, 1);



       IAudioCD* audio = Library::CreateAudioCD();

       audio->SetDevice(dev);

       audio->SetAudioDecodingMethod(ADM_MEMORY);



       char_t* inputPath = _T("C:\\sample.wav");

       IAudioInput* ain = Library::CreateAudioInput();

       ain->SetFilePath(inputPath);

       bool_t res = audio->GetAudioInputsRef()->Add(ain);

       if (!res)

       {

             // failed to add audio input

             return;

       }

       // Leave AudioCD to be the single owner the IAudioInput instance

       ain->Release();

       ain = NULL;

       int32_t len1 = audio->GetInputLength(audio->GetAudioInputsRef()->GetItemRef(0));

       // It is essential that the audio input should be 2 seconds longer than usual,

       // since the first 150 frames(blocks) of the input will be written in the 2s pregap

       // that is usually filled with digital silence

       printf("audio frames: %d", len1);



       ICDSession* pSession = Library::CreateCDSession();

       pSession->SetType(ST_CDDA);

       ICDTrack* pTrack = Library::CreateCDTrack();

       pTrack->SetType(TT_AUDIO);

       // CD_PREGAP_START equals -150 - this will allow you to write user data in 

       // the first 2 seconds of the pregap as well

       pTrack->SetPregapStart(CD_PREGAP_START);

       // Just leave the first 2 seconds as the intended pregap (hidden track) and continue

       // from address 0 with the rest of the audio input data

       pTrack->SetStart(0);

       int32_t pos = len1 - 1;

       // Since the first two seconds of the audio input will be in the pregap,

       // then the actual end is CD_PREGAP_LENGTH blocks earlier as well.

       pTrack->SetEnd(pos - CD_PREGAP_LENGTH);

       // The same goes for the postgap

       pTrack->SetPostgapEnd(pos - CD_PREGAP_LENGTH);

       pSession->GetTracksRef()->Add(pTrack);

       pTrack->Release();

       audio->SetCDSession(pSession);

       pSession->Release();



       res = audio->WriteToCD();

       if (!res)

       {

             printf("\n last error: 0x%x  \n ", audio->GetLastError());

       }

       audio->Release();

       dev->Release();

       devices->Release();

       engine->Shutdown();

       engine->Release();

}