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pcm: Add MSBITS subformat options

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Improve granularity of format selection for S32/U32 formats by adding
masks representing 20, 24 and 32 most significant bits.

Closes: https://github.com/alsa-project/alsa-lib/pull/342
Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Cezary Rojewski 2023-08-04 10:13:40 +02:00 • committed by Jaroslav Kysela
parent f33284e85e
commit d8000f57fc
4 changed files with 21 additions and 3 deletions
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5
include/sound/uapi/asound.h
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@ -274,7 +274,10 @@ typedef int __bitwise snd_pcm_format_t;
typedef int __bitwise snd_pcm_subformat_t;
#define SNDRV_PCM_SUBFORMAT_STD ((snd_pcm_subformat_t) 0)
#define SNDRV_PCM_SUBFORMAT_LAST SNDRV_PCM_SUBFORMAT_STD
#define SNDRV_PCM_SUBFORMAT_MSBITS_MAX ((snd_pcm_subformat_t) 1)
#define SNDRV_PCM_SUBFORMAT_MSBITS_20 ((snd_pcm_subformat_t) 2)
#define SNDRV_PCM_SUBFORMAT_MSBITS_24 ((snd_pcm_subformat_t) 3)
#define SNDRV_PCM_SUBFORMAT_LAST SNDRV_PCM_SUBFORMAT_MSBITS_24
#define SNDRV_PCM_INFO_MMAP 0x00000001 /* hardware supports mmap */
#define SNDRV_PCM_INFO_MMAP_VALID 0x00000002 /* period data are valid during transfer */