This changes in MINIMAL FULL DUPLEX is not enought!

This changes in MINIMAL FULL DUPLEX is not enought!

[pavelni]

These changes in MINIMAL FULL DUPLEX AP is not enought!
I did this changes before, but was not able to get loop
from input to output, althought I have programed the same application
with using OSS before. So I little experiment to solve the problem.  
  I set length of buffer at 44100 and tryed what happend. First it
recorded first buffer length. Then it  played the same length. And
that is all. Then no sound recorded and no sound played. Is it
somebody able to solve this problem to get final version of MINIMAL
FULL DUPLEX?                                 Thanks
                                     Pavel
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));

Re: This changes in MINIMAL FULL DUPLEX is not enought!

[Howard Abrams]

Exactly.

These changes were only enough to get the example to compile,
it still doesn't work for me either.

Does ANYONE have a working example of a FULL DUPLEX alsa program?

h.

pavelni@volny.cz wrote:

> These changes in MINIMAL FULL DUPLEX AP is not enought!
> I did this changes before, but was not able to get loop
> from input to output, althought I have programed the same application
> with using OSS before. So I little experiment to solve the problem.  
>   I set length of buffer at 44100 and tryed what happend. First it
> recorded first buffer length. Then it  played the same length. And
> that is all. Then no sound recorded and no sound played. Is it
> somebody able to solve this problem to get final version of MINIMAL
> FULL DUPLEX?                                 Thanks
>                                      Pavel
> 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));
>>
> 
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