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| author | Jaroslav Kysela <perex@perex.cz> | 2024-06-25 20:25:46 +0300 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2024-07-02 10:53:21 +0300 |
| commit | f05c1ffc274516ef101d2e0f860bcb9b08c6c622 (patch) | |
| tree | 6e57abd9c85b75d301ad83377b22aa86ad1d3344 /include/sound | |
| parent | 5b707581c072bcef086ef4c122a2ea81470a1027 (diff) | |
| download | linux-f05c1ffc274516ef101d2e0f860bcb9b08c6c622.tar.xz | |
ALSA: pcm: reinvent the stream synchronization ID API
Until the commit e11f0f90a626 ("ALSA: pcm: remove SNDRV_PCM_IOCTL1_INFO
internal command"), there was a possibility to pass information
about the synchronized streams to the user space. The mentioned
commit removed blindly the appropriate code with an irrelevant comment.
The revert may be appropriate, but since this API was lost for several
years without any complains, it's time to improve it. The hardware
parameters may change the used stream clock source (e.g. USB hardware)
so move this synchronization ID to hw_params as read-only field.
It seems that pipewire can benefit from this API (disable adaptive
resampling for perfectly synchronized PCM streams) now.
Note that the contents of ID is not supposed to be used for direct
comparison with a specific byte sequence. The "empty" case is when
all bytes are zero (driver does not offer this information)
and all other cases must be only used for equal comparison among
PCM streams (including different sound cards) if they are using
identical hardware clock.
Cc: Takashi Sakamoto <takaswie@kernel.org>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20240625172836.589380-2-perex@perex.cz
Diffstat (limited to 'include/sound')
| -rw-r--r-- | include/sound/pcm.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/sound/pcm.h b/include/sound/pcm.h index 3edd7a7346da..dbce137d8806 100644 --- a/include/sound/pcm.h +++ b/include/sound/pcm.h @@ -93,6 +93,7 @@ struct snd_pcm_ops { #define SNDRV_PCM_IOCTL1_CHANNEL_INFO 2 /* 3 is absent slot. */ #define SNDRV_PCM_IOCTL1_FIFO_SIZE 4 +#define SNDRV_PCM_IOCTL1_SYNC_ID 5 #define SNDRV_PCM_TRIGGER_STOP 0 #define SNDRV_PCM_TRIGGER_START 1 @@ -401,7 +402,7 @@ struct snd_pcm_runtime { snd_pcm_uframes_t silence_start; /* starting pointer to silence area */ snd_pcm_uframes_t silence_filled; /* already filled part of silence area */ - union snd_pcm_sync_id sync; /* hardware synchronization ID */ + unsigned char sync[16]; /* hardware synchronization ID */ /* -- mmap -- */ struct snd_pcm_mmap_status *status; |