Re: Simple ALSA capture/playback example and help wanted

[Howard Abrams <abramsh@acm.org>]

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Mark Rages wrote:

> On Thu, Mar 28, 2002 at 09:05:31PM -0800, Howard Abrams wrote:
> 
>>Thanks Mark. I'll take a look at jack, but in the near-term, I
>>copied a sample from a link off your page. It must have been
>>from a earlier rev of the api, but it only required very minimal
>>changes to compile.
>>
>>The program I used was "A Minimal Full-Duplex Program", off the
>>page: http://www.op.net/~pbd/alsa-audio.html#duplexex
>>
> 
> Can you tell us what changes were required? It will help improve the
> documentation.


Sure, a diff is attached.


> Sorry, I don't have the expertise (or the appropriate soundcard)
> to help with your specific problem.
> 


Is Takashi Iwai on this list? He's credited in the source for the
driver. Anyone else have one of these cards?


h.

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12c10
<          if ((snd_pcm_open ( &playback_handle, argv[1], SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
---
>          if ((playback_handle = snd_pcm_open (argv[1], SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
17c15
<          if ((snd_pcm_open ( &capture_handle, argv[1], SND_PCM_STREAM_CAPTURE, 0)) < 0) {
---
>          if ((capture_handle = snd_pcm_open (argv[1], SND_PCM_STREAM_CAPTURE, 0)) < 0) {
27c25
<          snd_pcm_hw_params_set_rate_near (playback_handle, hw_params, 44100, 0);
---
>          snd_pcm_hw_params_set_rate_near (playback_handle, hw_params, 44100);
35c33
<          snd_pcm_hw_params_set_rate_near (capture_handle, hw_params, 44100, 0);
---
>          snd_pcm_hw_params_set_rate_near (capture_handle, hw_params, 44100);
45,46c43,44
<                  snd_pcm_writei (playback_handle, pbuf, sizeof (pbuf));
<                  snd_pcm_readi (capture_handle, cbuf, sizeof (cbuf));
---
>                  snd_pcm_write (playback_handle, pbuf, sizeof (pbuf));
>                  snd_pcm_read (capture_handle, cbuf, sizeof (cbuf));