Not able to configure my playback device to MONO . But my playback device supports MONO. What is wrong in the below configuration
Error : Channels not available for PLAYBACK device
retVal = snd_pcm_hw_params_set_channels( pcm, hwparams, 1);
if (retVal < 0){
printf("Channels not available : %s\n", name);
return retVal;
}
/*************************************************************/
int initializeDevice(snd_pcm_t* pcm,snd_pcm_hw_params_t *hwparams, int deviceType)
{
const char* name = snd_pcm_stream_name( snd_pcm_stream(pcm));
snd_pcm_uframes_t framecount;
int retVal = 0;
retVal = snd_pcm_hw_params_any(pcm, hwparams);
if (retVal < 0){
printf( "Configuration FAILED for %s\n", name);
return retVal;
}
retVal = snd_pcm_hw_params_set_format( pcm, hwparams, SND_PCM_FORMAT_S16_LE);
if (retVal < 0){
printf( "Sample format not available for %s\n", name);
return retVal;
}
retVal = snd_pcm_hw_params_set_access( pcm, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED);
if (retVal < 0){
printf( "Access not available for %s\n", name);
return retVal;
}
/*Set Sampling Frequency*/
int rate;
rate= ALSA_SAMPLERATE;
retVal = snd_pcm_hw_params_set_rate_near( pcm, hwparams, (unsigned int*)&rate, 0);
if (retVal < 0){
printf( "Rate %iHz not available for playback\n", rate);
return retVal;
}
if ((unsigned)rate != ALSA_SAMPLERATE){
printf( "Could not configure requested sampling rate\n");
return -1;
}
retVal = snd_pcm_hw_params_set_period_size(pcm, hwparams, 512, 0);
if (retVal < 0){
printf( "Could not configure requested period size : %s", name);
return retVal;
}
/*Get period size and check whether period size requested is configured*/
retVal = snd_pcm_hw_params_set_periods( pcm, hwparams,4, 0);
if (retVal < 0){
printf( "Error : Configuring period count\n");
return retVal;
}
#if 1
int dir;
unsigned int val;
snd_pcm_uframes_t frames;
snd_pcm_hw_params_get_period_size(hwparams, &frames, &dir);
printf("period size = %d frames\n", (int)frames);
snd_pcm_hw_params_get_periods(hwparams, &val, &dir);
printf("periods per alsa buffer = %d frames\n", val);
snd_pcm_hw_params_get_buffer_size(hwparams, (snd_pcm_uframes_t *) &val);
printf("buffer size = %d frames\n", val);
#endif
retVal = snd_pcm_hw_params_set_channels( pcm, hwparams, 1);
if (retVal < 0){
printf("Channels not available : %s\n", name);
return retVal;
}
retVal = snd_pcm_hw_params( pcm, hwparams);
if (retVal < 0){
printf( "Error in configuring hw params : %s\n", name);
return retVal;
}
snd_pcm_hw_params_current( pcm, hwparams);
/*Get ALSA Buffer size and check whether alsa buffer size requested is configured*/
return 0;
}
/*************************************************************/
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