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ALSA cap.: be more verbose about errors

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This commit is contained in:
Martin Pulec
2012-06-28 10:46:38 +02:00
parent b678b4746a
commit d4df7b9ae9
1 changed files with 36 additions and 5 deletions
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41
ultragrid/src/audio/capture/alsa.c
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@@ -66,6 +66,7 @@ struct state_alsa_capture {
struct audio_frame frame;
snd_pcm_uframes_t frames;
unsigned int device_channels;
};
void audio_play_alsa_help(const char *driver_name);
@@ -106,25 +107,55 @@ void * audio_cap_alsa_init(char *cfg)
snd_pcm_hw_params_alloca(&params);
/* Fill it in with default values. */
snd_pcm_hw_params_any(s->handle, params);
rc = snd_pcm_hw_params_any(s->handle, params);
if (rc < 0) {
fprintf(stderr, "unable to set default parameters: %s\n",
snd_strerror(rc));
goto error;
}
/* Set the desired hardware parameters. */
/* Interleaved mode */
snd_pcm_hw_params_set_access(s->handle, params,
rc = snd_pcm_hw_params_set_access(s->handle, params,
SND_PCM_ACCESS_RW_INTERLEAVED);
if (rc < 0) {
fprintf(stderr, "unable to set interleaved mode: %s\n",
snd_strerror(rc));
goto error;
}
/* Signed 16-bit little-endian format */
snd_pcm_hw_params_set_format(s->handle, params,
rc = snd_pcm_hw_params_set_format(s->handle, params,
SND_PCM_FORMAT_S16_LE);
if (rc < 0) {
fprintf(stderr, "unable to set capture format: %s\n",
snd_strerror(rc));
goto error;
}
/* Two channels (stereo) */
snd_pcm_hw_params_set_channels(s->handle, params, s->frame.ch_count);
rc = snd_pcm_hw_params_set_channels(s->handle, params, s->frame.ch_count);
if (rc < 0) {
if(s->frame.ch_count == 1) { // some devices cannot do mono
snd_pcm_hw_params_set_channels_first(s->handle, params, &s->device_channels);
} else {
fprintf(stderr, "unable to set channel count: %s\n",
snd_strerror(rc));
goto error;
}
}
/* sampling rate (CD quality) */
val = s->frame.sample_rate;
snd_pcm_hw_params_set_rate_near(s->handle, params,
dir = 0;
rc = snd_pcm_hw_params_set_rate_near(s->handle, params,
&val, &dir);
if (rc < 0) {
fprintf(stderr, "unable to sampling rate: %s\n",
snd_strerror(rc));
goto error;
}
/* Set period size to 32 frames. */
s->frames = 128;