Jan Newmarch wrote:
> I can capture sound to a file from a C program. I can play from the file. But
> when i try to playback captured audio directly I get many errors.
Both devices' clocks must be synchronized (this is usually the case only
if they are on the same card), and to avoid underruns, you must fill the
playback buffer as much as possible before starting playback. In other
words, increase the start threshold on the playback device.
> if ((nread = snd_pcm_readi (capture_handle, buf, BUF_SIZE)) != BUF_SIZE) {
> fprintf (stderr, "read from audio interface failed (%s)\n",
> snd_strerror (nread));
Please note that if an error occurs when some data has already been
read, you get the number of frames read; an actual error code is
returned only from a snd_pcm_readi call that returns no data.
(Same for snd_pcm_writei.)
Regards,
Clemens
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