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authorTakashi Iwai <tiwai@suse.de>2012-07-27 20:27:00 +0400
committerTakashi Iwai <tiwai@suse.de>2012-09-06 20:01:16 +0400
commit2d3391ec0ecca37efb6bc995906292f47522b471 (patch)
tree129e8bce7b18bb9de48d6bc0e63806d22b40ad99 /include/sound/tlv.h
parenta8d372f171db9b90a64778fbcd9237c9bc256e06 (diff)
downloadlinux-2d3391ec0ecca37efb6bc995906292f47522b471.tar.xz
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.h8
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 */