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output/alsa: move functions to lib/alsa/Format.hxx

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This commit is contained in:
Max Kellermann
2017-10-26 09:30:37 +02:00
parent b08cb148ae
commit b30c37eb79
3 changed files with 134 additions and 99 deletions
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100
src/output/plugins/AlsaOutputPlugin.cxx
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@@ -19,6 +19,7 @@
#include "config.h"
#include "AlsaOutputPlugin.hxx"
#include "lib/alsa/Format.hxx"
#include "lib/alsa/NonBlock.hxx"
#include "lib/alsa/PeriodBuffer.hxx"
#include "lib/alsa/Version.hxx"
@@ -366,105 +367,6 @@ alsa_test_default_device()
return true;
}
/**
* Convert MPD's #SampleFormat enum to libasound's snd_pcm_format_t
* enum. Returns SND_PCM_FORMAT_UNKNOWN if there is no according ALSA
* PCM format.
*/
gcc_const
static snd_pcm_format_t
ToAlsaPcmFormat(SampleFormat sample_format) noexcept
{
switch (sample_format) {
case SampleFormat::UNDEFINED:
return SND_PCM_FORMAT_UNKNOWN;
case SampleFormat::DSD:
#ifdef HAVE_ALSA_DSD
return SND_PCM_FORMAT_DSD_U8;
#else
return SND_PCM_FORMAT_UNKNOWN;
#endif
case SampleFormat::S8:
return SND_PCM_FORMAT_S8;
case SampleFormat::S16:
return SND_PCM_FORMAT_S16;
case SampleFormat::S24_P32:
return SND_PCM_FORMAT_S24;
case SampleFormat::S32:
return SND_PCM_FORMAT_S32;
case SampleFormat::FLOAT:
return SND_PCM_FORMAT_FLOAT;
}
assert(false);
gcc_unreachable();
}
/**
* Determine the byte-swapped PCM format. Returns
* SND_PCM_FORMAT_UNKNOWN if the format cannot be byte-swapped.
*/
static snd_pcm_format_t
ByteSwapAlsaPcmFormat(snd_pcm_format_t fmt) noexcept
{
switch (fmt) {
case SND_PCM_FORMAT_S16_LE: return SND_PCM_FORMAT_S16_BE;
case SND_PCM_FORMAT_S24_LE: return SND_PCM_FORMAT_S24_BE;
case SND_PCM_FORMAT_S32_LE: return SND_PCM_FORMAT_S32_BE;
case SND_PCM_FORMAT_S16_BE: return SND_PCM_FORMAT_S16_LE;
case SND_PCM_FORMAT_S24_BE: return SND_PCM_FORMAT_S24_LE;
case SND_PCM_FORMAT_S24_3BE:
return SND_PCM_FORMAT_S24_3LE;
case SND_PCM_FORMAT_S24_3LE:
return SND_PCM_FORMAT_S24_3BE;
case SND_PCM_FORMAT_S32_BE: return SND_PCM_FORMAT_S32_LE;
#ifdef HAVE_ALSA_DSD_U32
case SND_PCM_FORMAT_DSD_U16_LE:
return SND_PCM_FORMAT_DSD_U16_BE;
case SND_PCM_FORMAT_DSD_U16_BE:
return SND_PCM_FORMAT_DSD_U16_LE;
case SND_PCM_FORMAT_DSD_U32_LE:
return SND_PCM_FORMAT_DSD_U32_BE;
case SND_PCM_FORMAT_DSD_U32_BE:
return SND_PCM_FORMAT_DSD_U32_LE;
#endif
default: return SND_PCM_FORMAT_UNKNOWN;
}
}
/**
* Check if there is a "packed" version of the give PCM format.
* Returns SND_PCM_FORMAT_UNKNOWN if not.
*/
static snd_pcm_format_t
PackAlsaPcmFormat(snd_pcm_format_t fmt)
{
switch (fmt) {
case SND_PCM_FORMAT_S24_LE:
return SND_PCM_FORMAT_S24_3LE;
case SND_PCM_FORMAT_S24_BE:
return SND_PCM_FORMAT_S24_3BE;
default:
return SND_PCM_FORMAT_UNKNOWN;
}
}
/**
* Attempts to configure the specified sample format. On failure,
* fall back to the packed version.