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rtpopuspay: add info regarding (non-standard) multichannel support

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Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/832>
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Jakub Adam 2020-12-07 19:51:35 +01:00 committed by GStreamer Merge Bot
parent 748a1866af
commit 5fe0aa03eb
1 changed files with 23 additions and 0 deletions
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23
gst/rtp/gstrtpopuspay.c
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@ -19,6 +19,29 @@
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-rtpopuspay
* @title: rtpopuspay
*
* rtpopuspay encapsulates Opus-encoded audio data into RTP packets following
* the payload format described in RFC 7587.
*
* In addition to the RFC, which assumes only mono and stereo payload,
* the element supports multichannel Opus audio streams using a non-standardized
* SDP config and "multiopus" codec developed by Google for libwebrtc. When the
* input data have more than 2 channels, rtpopuspay will add extra fields to
* output caps that can be used to generate SDP in the syntax understood by
* libwebrtc. For example in the case of 5.1 audio:
*
* |[
* a=rtpmap:96 multiopus/48000/6
* a=fmtp:96 num_streams=4;coupled_streams=2;channel_mapping=0,4,1,2,3,5
* ]|
*
* See https://webrtc-review.googlesource.com/c/src/+/129768 for more details on
* multichannel Opus in libwebrtc.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif