[alsa-devel] Join play of pcm in multiple playback devices

Hello All,

I have written an application which supports join play of PCM Audio. i.e Capture and write to playback device 1 and playback device 2 simultaneously.

Below code is just to explain the above scenario :

/######################/

while(1) { retval=snd_pcm_readi(pAlsaConfig->pcm_handle, buffer, pAlsaConfig->alsaBufferSize); snd_pcm_writei(pAlsaConfig->pcm_handle1, buffer,retval); snd_pcm_writei(pAlsaConfig->pcm_handle2, buffer,retval); }

/######################/

In above case, renderer 2 lags behind the renderer 1 i.e there is delay between two audio devices when actually heard.

Please help me if some better implementation for join play. I have seen some thing as snd_pcm_link(). But i was not clear with its usage, while doing snd_pcm_writei ???

Thanks and regards, Irfan