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if S16NE is not supported, fall back to S16RE. If FLOAT32NE is not supported, fall back to FLOAT32NE. If still nothing is supported, try everything else in order

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git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1020 fefdeb5f-60dc-0310-8127-8f9354f1896f
This commit is contained in:
Lennart Poettering 2006-06-16 19:33:05 +00:00
parent 8e37d68ae3
commit a529b281eb
1 changed files with 70 additions and 14 deletions
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84
src/modules/alsa-util.c
View file

@ -247,15 +247,8 @@ int pa_alsa_fdlist_init_mixer(struct pa_alsa_fdlist *fdl, snd_mixer_t *mixer_han
return 0;
}
/* Set the hardware parameters of the given ALSA device. Returns the
* selected fragment settings in *period and *period_size */
int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, pa_sample_spec *ss, uint32_t *periods, snd_pcm_uframes_t *period_size) {
int ret = -1;
snd_pcm_uframes_t buffer_size;
snd_pcm_hw_params_t *hwparams = NULL;
unsigned int r = ss->rate;
unsigned int c = ss->channels;
static int set_format(snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hwparams, pa_sample_format_t *f) {
static const snd_pcm_format_t format_trans[] = {
[PA_SAMPLE_U8] = SND_PCM_FORMAT_U8,
[PA_SAMPLE_ALAW] = SND_PCM_FORMAT_A_LAW,
@ -265,15 +258,73 @@ int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, pa_sample_spec *ss, uint32_t *p
[PA_SAMPLE_FLOAT32LE] = SND_PCM_FORMAT_FLOAT_LE,
[PA_SAMPLE_FLOAT32BE] = SND_PCM_FORMAT_FLOAT_BE,
};
assert(pcm_handle && ss && periods && period_size);
static const pa_sample_format_t try_order[] = {
PA_SAMPLE_S16NE,
PA_SAMPLE_S16RE,
PA_SAMPLE_FLOAT32NE,
PA_SAMPLE_FLOAT32RE,
PA_SAMPLE_ULAW,
PA_SAMPLE_ALAW,
PA_SAMPLE_U8,
PA_SAMPLE_INVALID
};
int i, ret;
assert(pcm_handle);
assert(f);
if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
return ret;
if (*f == PA_SAMPLE_FLOAT32BE)
*f = PA_SAMPLE_FLOAT32LE;
else if (*f == PA_SAMPLE_FLOAT32LE)
*f = PA_SAMPLE_FLOAT32BE;
else if (*f == PA_SAMPLE_S16BE)
*f = PA_SAMPLE_S16LE;
else if (*f == PA_SAMPLE_S16LE)
*f = PA_SAMPLE_S16BE;
else
goto try_auto;
if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
return ret;
try_auto:
for (i = 0; try_order[i] != PA_SAMPLE_INVALID; i++) {
*f = try_order[i];
if ((ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[*f])) >= 0)
return ret;
}
return -1;
}
/* Set the hardware parameters of the given ALSA device. Returns the
* selected fragment settings in *period and *period_size */
int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, pa_sample_spec *ss, uint32_t *periods, snd_pcm_uframes_t *period_size) {
int ret = -1;
snd_pcm_uframes_t buffer_size;
unsigned int r = ss->rate;
unsigned int c = ss->channels;
pa_sample_format_t f = ss->format;
snd_pcm_hw_params_t *hwparams;
assert(pcm_handle);
assert(ss);
assert(periods);
assert(period_size);
buffer_size = *periods * *period_size;
if ((ret = snd_pcm_hw_params_malloc(&hwparams)) < 0 ||
(ret = snd_pcm_hw_params_any(pcm_handle, hwparams)) < 0 ||
(ret = snd_pcm_hw_params_set_access(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0 ||
(ret = snd_pcm_hw_params_set_format(pcm_handle, hwparams, format_trans[ss->format])) < 0 ||
(ret = snd_pcm_hw_params_set_rate_near(pcm_handle, hwparams, &r, NULL)) < 0 ||
(ret = set_format(pcm_handle, hwparams, &f)) < 0 ||
(ret = snd_pcm_hw_params_set_channels_near(pcm_handle, hwparams, &c)) < 0 ||
(*period_size > 0 && (ret = snd_pcm_hw_params_set_period_size_near(pcm_handle, hwparams, period_size, NULL)) < 0) ||
(*periods > 0 && (ret = snd_pcm_hw_params_set_buffer_size_near(pcm_handle, hwparams, &buffer_size)) < 0) ||
@ -281,7 +332,7 @@ int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, pa_sample_spec *ss, uint32_t *p
goto finish;
if (ss->rate != r) {
pa_log_info(__FILE__": device doesn't support %u Hz, changed to %u Hz.", ss->rate, r);
pa_log_warn(__FILE__": device doesn't support %u Hz, changed to %u Hz.", ss->rate, r);
/* If the sample rate deviates too much, we need to resample */
if (r < ss->rate*.95 || r > ss->rate*1.05)
@ -289,9 +340,14 @@ int pa_alsa_set_hw_params(snd_pcm_t *pcm_handle, pa_sample_spec *ss, uint32_t *p
}
if (ss->channels != c) {
pa_log_info(__FILE__": device doesn't support %u channels, changed to %u.", ss->channels, c);
pa_log_warn(__FILE__": device doesn't support %u channels, changed to %u.", ss->channels, c);
ss->channels = c;
}
if (ss->format != f) {
pa_log_warn(__FILE__": device doesn't support sample format %s, changed to %s.", pa_sample_format_to_string(ss->format), pa_sample_format_to_string(f));
ss->format = f;
}
if ((ret = snd_pcm_prepare(pcm_handle)) < 0)
goto finish;