Module: libav Branch: master Commit: a05f5052fef3b3743fab7846da12861d8a8098ec
Author: Timothy B. Terriberry <[email protected]> Committer: Martin Storsjö <[email protected]> Date: Wed Sep 24 17:43:22 2014 -0700 sdp: Make opus declaration conform to the spec Signed-off-by: Martin Storsjö <[email protected]> --- libavformat/sdp.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/libavformat/sdp.c b/libavformat/sdp.c index 3c39ac7..eccd676 100644 --- a/libavformat/sdp.c +++ b/libavformat/sdp.c @@ -583,8 +583,18 @@ static char *sdp_write_media_attributes(char *buff, int size, AVCodecContext *c, payload_type, c->sample_rate); break; case AV_CODEC_ID_OPUS: - av_strlcatf(buff, size, "a=rtpmap:%d opus/48000\r\n", + /* The opus RTP draft says that all opus streams MUST be declared + as stereo, to avoid negotiation failures. The actual number of + channels can change on a packet-by-packet basis. The number of + channels a receiver prefers to receive or a sender plans to send + can be declared via fmtp parameters (both default to mono), but + receivers MUST be able to receive and process stereo packets. */ + av_strlcatf(buff, size, "a=rtpmap:%d opus/48000/2\r\n", payload_type); + if (c->channels == 2) { + av_strlcatf(buff, size, "a=fmtp:%d sprop-stereo:1\r\n", + payload_type); + } break; default: /* Nothing special to do here... */ _______________________________________________ libav-commits mailing list [email protected] https://lists.libav.org/mailman/listinfo/libav-commits
