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output/alsa: add API documentation

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This commit is contained in:
Max Kellermann 2014-08-26 09:37:30 +02:00
parent a86aaef4d0
commit 9d79c72c17
1 changed files with 17 additions and 0 deletions
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17
src/output/plugins/AlsaOutputPlugin.cxx
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@ -237,6 +237,11 @@ alsa_test_default_device(void)
return true; 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.
*/
static snd_pcm_format_t static snd_pcm_format_t
get_bitformat(SampleFormat sample_format) get_bitformat(SampleFormat sample_format)
{ {
@ -271,6 +276,10 @@ get_bitformat(SampleFormat sample_format)
gcc_unreachable(); 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 static snd_pcm_format_t
byteswap_bitformat(snd_pcm_format_t fmt) byteswap_bitformat(snd_pcm_format_t fmt)
{ {
@ -292,6 +301,10 @@ byteswap_bitformat(snd_pcm_format_t fmt)
} }
} }
/**
* Check if there is a "packed" version of the give PCM format.
* Returns SND_PCM_FORMAT_UNKNOWN if not.
*/
static snd_pcm_format_t static snd_pcm_format_t
alsa_to_packed_format(snd_pcm_format_t fmt) alsa_to_packed_format(snd_pcm_format_t fmt)
{ {
@ -307,6 +320,10 @@ alsa_to_packed_format(snd_pcm_format_t fmt)
} }
} }
/**
* Attempts to configure the specified sample format. On failure,
* fall back to the packed version.
*/
static int static int
alsa_try_format_or_packed(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams, alsa_try_format_or_packed(snd_pcm_t *pcm, snd_pcm_hw_params_t *hwparams,
snd_pcm_format_t fmt, bool *packed_r) snd_pcm_format_t fmt, bool *packed_r)