add audio metadata

Add some audio metadata to describe a downmix matrix.
Add metadata to media type document.

2 files changed, 22 insertions, 0 deletions

diff --git a/docs/design/part-mediatype-audio-raw.txt b/docs/design/part-mediatype-audio-raw.txt
index b5826722c6..1a45342b47 100644
--- a/docs/design/part-mediatype-audio-raw.txt
+++ b/docs/design/part-mediatype-audio-raw.txt
@@ -16,6 +16,13 @@ Media Types
   channel-positions, G_TYPE_VALUE_ARRAY
    An array with a channel position for each channel. The number of items in
    this array must be the same as the channels property.
+
+
+Metadata
+--------
+
+ "GstAudioDownmixMeta"
+   A matrix for downmixing multichannel audio to mono or stereo.
    
 
 Formats
diff --git a/docs/design/part-mediatype-video-raw.txt b/docs/design/part-mediatype-video-raw.txt
index 9f62a317f1..2f55b8b82c 100644
--- a/docs/design/part-mediatype-video-raw.txt
+++ b/docs/design/part-mediatype-video-raw.txt
@@ -59,6 +59,21 @@ Media Types
     The format of the video, see the Formats section for a list of valid format
     strings.
 
+Metadata
+--------
+
+ "GstVideoMeta"
+   contains the description of one video field or frame. It has
+   stride support and support for having multiple memory regions per frame.
+
+   Multiple GstVideoMeta can be added to a buffer and can be identified with a
+   unique id. This id can be used to select fields in interlaced formats or
+   views in multiview formats.
+
+ "GstVideoCropMeta"
+   Contains the cropping region of the video.
+
+
 Formats
 -------