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Improve checks for supported output formats from ALSA

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This commit is contained in:
Chris Robinson 2012-02-09 22:26:16 -08:00
parent a98e381c8e
commit b4b492c417
1 changed files with 46 additions and 19 deletions
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77
Alc/backends/alsa.c
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@ -60,6 +60,8 @@ MAKE_FUNC(snd_pcm_hw_params_get_buffer_size);
MAKE_FUNC(snd_pcm_hw_params_get_period_size);
MAKE_FUNC(snd_pcm_hw_params_get_access);
MAKE_FUNC(snd_pcm_hw_params_get_periods);
MAKE_FUNC(snd_pcm_hw_params_test_format);
MAKE_FUNC(snd_pcm_hw_params_test_channels);
MAKE_FUNC(snd_pcm_hw_params);
MAKE_FUNC(snd_pcm_sw_params_malloc);
MAKE_FUNC(snd_pcm_sw_params_current);
@ -124,6 +126,8 @@ MAKE_FUNC(snd_card_next);
#define snd_pcm_hw_params_get_period_size psnd_pcm_hw_params_get_period_size
#define snd_pcm_hw_params_get_access psnd_pcm_hw_params_get_access
#define snd_pcm_hw_params_get_periods psnd_pcm_hw_params_get_periods
#define snd_pcm_hw_params_test_format psnd_pcm_hw_params_test_format
#define snd_pcm_hw_params_test_channels psnd_pcm_hw_params_test_channels
#define snd_pcm_hw_params psnd_pcm_hw_params
#define snd_pcm_sw_params_malloc psnd_pcm_sw_params_malloc
#define snd_pcm_sw_params_current psnd_pcm_sw_params_current
@ -206,6 +210,8 @@ static ALCboolean alsa_load(void)
LOAD_FUNC(snd_pcm_hw_params_get_period_size);
LOAD_FUNC(snd_pcm_hw_params_get_access);
LOAD_FUNC(snd_pcm_hw_params_get_periods);
LOAD_FUNC(snd_pcm_hw_params_test_format);
LOAD_FUNC(snd_pcm_hw_params_test_channels);
LOAD_FUNC(snd_pcm_hw_params);
LOAD_FUNC(snd_pcm_sw_params_malloc);
LOAD_FUNC(snd_pcm_sw_params_current);
@ -664,36 +670,57 @@ static ALCboolean alsa_reset_playback(ALCdevice *device)
err = "set access";
}
/* set format (implicitly sets sample bits) */
if(i >= 0 && (i=snd_pcm_hw_params_test_format(data->pcmHandle, p, format)) < 0)
{
static const struct {
snd_pcm_format_t format;
enum DevFmtType fmttype;
} formatlist[] = {
{ SND_PCM_FORMAT_FLOAT, DevFmtFloat },
{ SND_PCM_FORMAT_S16, DevFmtShort },
{ SND_PCM_FORMAT_U16, DevFmtUShort },
{ SND_PCM_FORMAT_S8, DevFmtByte },
{ SND_PCM_FORMAT_U8, DevFmtUByte },
};
size_t k;
err = "test format";
for(k = 0;k < sizeof(formatlist)/sizeof(formatlist[0]);k++)
{
format = formatlist[k].format;
if((i=snd_pcm_hw_params_test_format(data->pcmHandle, p, format)) >= 0)
{
device->FmtType = formatlist[k].fmttype;
break;
}
}
}
if(i >= 0 && (i=snd_pcm_hw_params_set_format(data->pcmHandle, p, format)) < 0)
{
device->FmtType = DevFmtFloat;
if(format == SND_PCM_FORMAT_FLOAT ||
(i=snd_pcm_hw_params_set_format(data->pcmHandle, p, SND_PCM_FORMAT_FLOAT)) < 0)
{
device->FmtType = DevFmtShort;
if(format == SND_PCM_FORMAT_S16 ||
(i=snd_pcm_hw_params_set_format(data->pcmHandle, p, SND_PCM_FORMAT_S16)) < 0)
{
device->FmtType = DevFmtUByte;
if(format == SND_PCM_FORMAT_U8 ||
(i=snd_pcm_hw_params_set_format(data->pcmHandle, p, SND_PCM_FORMAT_U8)) < 0)
err = "set format";
}
}
}
/* set channels (implicitly sets frame bits) */
if(i >= 0 && (i=snd_pcm_hw_params_test_channels(data->pcmHandle, p, ChannelsFromDevFmt(device->FmtChans))) < 0)
{
static const enum DevFmtChannels channellist[] = {
DevFmtStereo,
DevFmtQuad,
DevFmtX51,
DevFmtX71,
DevFmtMono,
};
size_t k;
err = "test channels";
for(k = 0;k < sizeof(channellist)/sizeof(channellist[0]);k++)
{
if((i=snd_pcm_hw_params_test_channels(data->pcmHandle, p, ChannelsFromDevFmt(channellist[k]))) >= 0)
{
device->FmtChans = channellist[k];
break;
}
}
}
if(i >= 0 && (i=snd_pcm_hw_params_set_channels(data->pcmHandle, p, ChannelsFromDevFmt(device->FmtChans))) < 0)
{
if((i=snd_pcm_hw_params_set_channels(data->pcmHandle, p, 2)) < 0)
{
if((i=snd_pcm_hw_params_set_channels(data->pcmHandle, p, 1)) < 0)
err = "set channels";
else
device->FmtChans = DevFmtMono;
}
else
device->FmtChans = DevFmtStereo;
}
if(i >= 0 && (i=snd_pcm_hw_params_set_rate_resample(data->pcmHandle, p, 0)) < 0)
{
ERR("Failed to disable ALSA resampler\n");