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output/alsa: probe DSD_U32 if DSD_U8 fails

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See http://bugs.musicpd.org/view.php?id=4485
This commit is contained in:
Max Kellermann
2016-02-28 09:54:20 +01:00
parent fd7eb43366
commit 21fb7eea82
2 changed files with 31 additions and 1 deletions
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31
src/output/plugins/AlsaOutputPlugin.cxx
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@@ -24,6 +24,7 @@
#include "mixer/MixerList.hxx"
#include "pcm/PcmExport.hxx"
#include "config/ConfigError.hxx"
#include "system/ByteOrder.hxx"
#include "util/Manual.hxx"
#include "util/Error.hxx"
#include "util/Domain.hxx"
@@ -403,6 +404,34 @@ AlsaTryFormatOrByteSwap(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
return err;
}
/**
* Attempts to configure the specified sample format. On DSD_U8
* failure, attempt to switch to DSD_U32.
*/
static int
AlsaTryFormatDsd(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
snd_pcm_format_t fmt, PcmExport::Params &params)
{
int err = AlsaTryFormatOrByteSwap(pcm, hwparams, fmt, params);
#if defined(ENABLE_DSD) && defined(HAVE_ALSA_DSD_U32)
if (err == 0)
params.dsd_u32 = false;
if (err == -EINVAL && fmt == SND_PCM_FORMAT_DSD_U8) {
/* attempt to switch to DSD_U32 */
fmt = IsLittleEndian()
? SND_PCM_FORMAT_DSD_U32_LE
: SND_PCM_FORMAT_DSD_U32_BE;
err = AlsaTryFormatOrByteSwap(pcm, hwparams, fmt, params);
if (err == 0)
params.dsd_u32 = true;
}
#endif
return err;
}
static int
AlsaTryFormat(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
SampleFormat sample_format,
@@ -412,7 +441,7 @@ AlsaTryFormat(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
if (alsa_format == SND_PCM_FORMAT_UNKNOWN)
return -EINVAL;
return AlsaTryFormatOrByteSwap(pcm, hwparams, alsa_format, params);
return AlsaTryFormatDsd(pcm, hwparams, alsa_format, params);
}
/**