On Wed, 17 Dec 2014, Martin Storsjö wrote:
From: Thomas Volkert <[email protected]>
The packetizer only supports splitting at GOB headers - if
such aren't available frequently enough, it splits at any
random byte offset (not at a macroblock boundary either, which
would be allowed by the spec) and sends a payload header pretend
that it starts with a GOB header.
As long as a receiver doesn't try to handle such cases cleverly
but just drops broken frames, this shouldn't matter too much
in practice.
---
Changelog | 1 +
libavformat/Makefile | 2 +
libavformat/rtpdec.c | 1 +
libavformat/rtpdec_formats.h | 1 +
libavformat/rtpdec_h261.c | 202 +++++++++++++++++++++++++++++++++++++++++++
libavformat/rtpenc.c | 4 +
libavformat/rtpenc.h | 1 +
libavformat/rtpenc_h261.c | 102 ++++++++++++++++++++++
libavformat/sdp.c | 13 +++
libavformat/version.h | 4 +-
10 files changed, 329 insertions(+), 2 deletions(-)
create mode 100644 libavformat/rtpdec_h261.c
create mode 100644 libavformat/rtpenc_h261.c
diff --git a/libavformat/sdp.c b/libavformat/sdp.c
index a14a239..c033267 100644
--- a/libavformat/sdp.c
+++ b/libavformat/sdp.c
@@ -498,6 +498,19 @@ static char *sdp_write_media_attributes(char *buff, int
size, AVCodecContext *c,
payload_type, mode, config ? config : "");
break;
}
+ case AV_CODEC_ID_H261:
+ {
+ const char *pic_fmt = NULL;
+ /* only QCIF and CIF are specified as supported in RFC 4587 */
+ if (c->width == 176 && c->height == 144)
+ pic_fmt = "QCIF=1";
+ else if (c->width == 352 && c->height == 288)
+ pic_fmt = "CIF=1";
+ av_strlcatf(buff, size, "a=rtpmap:%d H261/90000\r\n",
payload_type);
+ if (pic_fmt)
+ av_strlcatf(buff, size, "a=fmtp:%d %s\r\n", payload_type,
pic_fmt);
+ break;
+ }
Actually, I'd add an "if (payload_type >= RTP_PT_PRIVATE)" before the
rtpmap line - normally we don't print rtpmap lines for formats with a
statically allcated payload type.
// Martin
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