Paul Davis wrote: > > >I am a little confused about your advice. I am not sure how to access > >the 'plughw' device from my application. > > snd_pcm_open (&handle, "plughw:N,M", ...) > > where N and M are the card number and subdevice number. Preferably, > this is a string supplied by the user, not hard coded into the application. > > >I am not sure of how I should be setting up my PCM devices. How do I > >tell them to convert, say, 8kHz audio data to 44.1kHz audio data so my > >hardware can play it at the correct speed? > > just as in the few token API examples. using > snd_pcm_hw_params_*(). there is no difference setting the parameters > no matter what "type" of PCM device you are using.
Apart from rates or 44.1 or 48kHz I was unable to find a rate/period size combination that I was able to use with plughw:0,0. snd_pcm_hw_params_set_period_size () failed for every period size I tried (64, 128, 256, 512, 1024, 2048 and 4096) when I had the rate set to 8, 16 or 32 kHz. I managed to set the following combinations of hardware parameters: -22050Hz with period sizes of 2048, 1024, 512, 256, 128 and 64 -11025Hz with period sizes of 1024, 512, 256, 128 and 64 but when I ran my application I encountered the following error ALSA lib pcm_hw.c:380:(snd_pcm_hw_start) SNDRV_PCM_IOCTL_START failed: Broken pipe Does anyone have any further suggestions of things that I could try or why this rate conversion isn't working for me? I am using ALSA 0.9.0beta12 with a Hammerfall Light (RME Digi9636) soundcard. Kris Modrak ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
