diff options
| author | Jaroslav Kysela <perex@perex.cz> | 2023-05-02 13:55:36 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2023-05-08 15:23:01 +0200 |
| commit | a4bb75c4f19db711676e6bf6a278d932a5e7667b (patch) | |
| tree | 4874aa6978abb14f2ce5a6479e54cfe74f9210c1 /include/uapi/sound/asound.h | |
| parent | 946233bb23becc2898db31ad785d94fe80aa15dc (diff) | |
ALSA: uapi: pcm: control the filling of the silence samples for drain
Introduce SNDRV_PCM_INFO_PERFECT_DRAIN and SNDRV_PCM_HW_PARAMS_NO_DRAIN_SILENCE
flags to fully control the filling of the silence samples in the drain ioctl.
Actually, the configurable silencing is going to be implemented in the user
space [1], but drivers (hardware) may not require this operation. Those flags
do the bidirectional setup for this operation:
1) driver may notify the presence of the perfect drain
2) user space may not require the filling of the silence samples to inhibit clicks
If we decide to move this operation to the kernel space in future, the
SNDRV_PCM_INFO_PERFECT_DRAIN flag may handle this situation without
double "silence" processing (user + kernel space).
The ALSA API should be universal, so forcing the behaviour (modifying of
the ring buffer with any samples) for the drain operation is not ideal.
[1] https://lore.kernel.org/alsa-devel/20230502115010.986325-1-perex@perex.cz/
[ fixed a typo in comment by tiwai ]
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Link: https://lore.kernel.org/r/20230502115536.986900-1-perex@perex.cz
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/uapi/sound/asound.h')
| -rw-r--r-- | include/uapi/sound/asound.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h index 0aa955aa8246..6322823b5270 100644 --- a/include/uapi/sound/asound.h +++ b/include/uapi/sound/asound.h @@ -274,6 +274,7 @@ typedef int __bitwise snd_pcm_subformat_t; #define SNDRV_PCM_INFO_DOUBLE 0x00000004 /* Double buffering needed for PCM start/stop */ #define SNDRV_PCM_INFO_BATCH 0x00000010 /* double buffering */ #define SNDRV_PCM_INFO_SYNC_APPLPTR 0x00000020 /* need the explicit sync of appl_ptr update */ +#define SNDRV_PCM_INFO_PERFECT_DRAIN 0x00000040 /* silencing at the end of stream is not required */ #define SNDRV_PCM_INFO_INTERLEAVED 0x00000100 /* channels are interleaved */ #define SNDRV_PCM_INFO_NONINTERLEAVED 0x00000200 /* channels are not interleaved */ #define SNDRV_PCM_INFO_COMPLEX 0x00000400 /* complex frame organization (mmap only) */ @@ -383,6 +384,9 @@ typedef int snd_pcm_hw_param_t; #define SNDRV_PCM_HW_PARAMS_NORESAMPLE (1<<0) /* avoid rate resampling */ #define SNDRV_PCM_HW_PARAMS_EXPORT_BUFFER (1<<1) /* export buffer */ #define SNDRV_PCM_HW_PARAMS_NO_PERIOD_WAKEUP (1<<2) /* disable period wakeups */ +#define SNDRV_PCM_HW_PARAMS_NO_DRAIN_SILENCE (1<<3) /* suppress drain with the filling + * of the silence samples + */ struct snd_interval { unsigned int min, max; |