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| author | Takashi Iwai <tiwai@suse.de> | 2012-07-27 18:27:00 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2012-09-06 18:01:16 +0200 |
| commit | 2d3391ec0ecca37efb6bc995906292f47522b471 (patch) | |
| tree | 129e8bce7b18bb9de48d6bc0e63806d22b40ad99 /include/sound/asound.h | |
| parent | a8d372f171db9b90a64778fbcd9237c9bc256e06 (diff) | |
| download | lwn-2d3391ec0ecca37efb6bc995906292f47522b471.tar.gz lwn-2d3391ec0ecca37efb6bc995906292f47522b471.zip | |
ALSA: PCM: channel mapping API implementation
This patch implements the basic data types for the standard channel
mapping API handling.
- The definitions of the channel positions and the new TLV types are
added in sound/asound.h and sound/tlv.h, so that they can be
referred from user-space.
- Introduced a new helper function snd_pcm_add_chmap_ctls() to create
control elements representing the channel maps for each PCM
(sub)stream.
- Some standard pre-defined channel maps are provided for
convenience.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'include/sound/asound.h')
| -rw-r--r-- | include/sound/asound.h | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/include/sound/asound.h b/include/sound/asound.h index 0876a1e76aef..376e75632e07 100644 --- a/include/sound/asound.h +++ b/include/sound/asound.h @@ -472,6 +472,36 @@ enum { SNDRV_PCM_TSTAMP_TYPE_LAST = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC, }; +/* channel positions */ +enum { + SNDRV_CHMAP_UNKNOWN = 0, + SNDRV_CHMAP_FL, /* front left */ + SNDRV_CHMAP_FC, /* front center */ + SNDRV_CHMAP_FR, /* front right */ + SNDRV_CHMAP_FLC, /* front left center */ + SNDRV_CHMAP_FRC, /* front right center */ + SNDRV_CHMAP_RL, /* rear left */ + SNDRV_CHMAP_RC, /* rear center */ + SNDRV_CHMAP_RR, /* rear right */ + SNDRV_CHMAP_RLC, /* rear left center */ + SNDRV_CHMAP_RRC, /* rear right center */ + SNDRV_CHMAP_SL, /* side left */ + SNDRV_CHMAP_SR, /* side right */ + SNDRV_CHMAP_LFE, /* LFE */ + SNDRV_CHMAP_FLW, /* front left wide */ + SNDRV_CHMAP_FRW, /* front right wide */ + SNDRV_CHMAP_FLH, /* front left high */ + SNDRV_CHMAP_FCH, /* front center high */ + SNDRV_CHMAP_FRH, /* front right high */ + SNDRV_CHMAP_TC, /* top center */ + SNDRV_CHMAP_NA, /* N/A, silent */ + SNDRV_CHMAP_LAST = SNDRV_CHMAP_NA, +}; + +#define SNDRV_CHMAP_POSITION_MASK 0xffff +#define SNDRV_CHMAP_PHASE_INVERSE (0x01 << 16) +#define SNDRV_CHMAP_DRIVER_SPEC (0x02 << 16) + #define SNDRV_PCM_IOCTL_PVERSION _IOR('A', 0x00, int) #define SNDRV_PCM_IOCTL_INFO _IOR('A', 0x01, struct snd_pcm_info) #define SNDRV_PCM_IOCTL_TSTAMP _IOW('A', 0x02, int) |