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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/tlv.h | |
| parent | ALSA: control: Fix missing VOLATILE flag at creating controls (diff) | |
| download | wireguard-linux-2d3391ec0ecca37efb6bc995906292f47522b471.tar.xz wireguard-linux-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/tlv.h')
| -rw-r--r-- | include/sound/tlv.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/sound/tlv.h b/include/sound/tlv.h index a64d8fe3f855..28c65e1ada21 100644 --- a/include/sound/tlv.h +++ b/include/sound/tlv.h @@ -86,4 +86,12 @@ #define TLV_DB_GAIN_MUTE -9999999 +/* + * channel-mapping TLV items + * TLV length must match with num_channels + */ +#define SNDRV_CTL_TLVT_CHMAP_FIXED 0x101 /* fixed channel position */ +#define SNDRV_CTL_TLVT_CHMAP_VAR 0x102 /* channels freely swappable */ +#define SNDRV_CTL_TLVT_CHMAP_PAIRED 0x103 /* pair-wise swappable */ + #endif /* __SOUND_TLV_H */ |