FFmpeg
libavformat
rtpenc_h263.c
Go to the documentation of this file.
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/*
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* RTP packetization for H.263 video
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* Copyright (c) 2009 Luca Abeni
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* Copyright (c) 2009 Martin Storsjo
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "
avformat.h
"
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#include "
rtpenc.h
"
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const
uint8_t *
ff_h263_find_resync_marker_reverse
(
const
uint8_t *restrict start,
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const
uint8_t *restrict end)
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{
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const
uint8_t *p = end - 1;
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start += 1;
/* Make sure we never return the original start. */
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for
(; p > start; p -= 2) {
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if
(!*p) {
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if
(!p[ 1] && p[2])
return
p;
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else
if
(!p[-1] && p[1])
return
p - 1;
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}
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}
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return
end;
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}
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/**
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* Packetize H.263 frames into RTP packets according to RFC 4629
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*/
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void
ff_rtp_send_h263
(
AVFormatContext
*s1,
const
uint8_t *buf1,
int
size
)
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{
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RTPMuxContext
*
s
= s1->
priv_data
;
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int
len
, max_packet_size;
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uint8_t *q;
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max_packet_size =
s
->max_payload_size;
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while
(
size
> 0) {
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q =
s
->buf;
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if
(
size
>= 2 && (buf1[0] == 0) && (buf1[1] == 0)) {
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*q++ = 0x04;
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buf1 += 2;
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size
-= 2;
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}
else
{
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*q++ = 0;
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}
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*q++ = 0;
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len
=
FFMIN
(max_packet_size - 2,
size
);
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/* Look for a better place to split the frame into packets. */
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if
(
len
<
size
) {
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const
uint8_t *end =
ff_h263_find_resync_marker_reverse
(buf1,
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buf1 +
len
);
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len
= end - buf1;
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}
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memcpy(q, buf1,
len
);
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q +=
len
;
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/* 90 KHz time stamp */
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s
->timestamp =
s
->cur_timestamp;
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ff_rtp_send_data
(s1,
s
->buf, q -
s
->buf, (
len
==
size
));
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buf1 +=
len
;
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size
-=
len
;
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}
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}
ff_rtp_send_data
void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m)
Definition:
rtpenc.c:336
ff_rtp_send_h263
void ff_rtp_send_h263(AVFormatContext *s1, const uint8_t *buf1, int size)
Packetize H.263 frames into RTP packets according to RFC 4629.
Definition:
rtpenc_h263.c:43
s
#define s(width, name)
Definition:
cbs_vp9.c:198
AVFormatContext
Format I/O context.
Definition:
avformat.h:1300
RTPMuxContext
Definition:
rtpenc.h:27
size
int size
Definition:
twinvq_data.h:10344
FFMIN
#define FFMIN(a, b)
Definition:
macros.h:49
len
int len
Definition:
vorbis_enc_data.h:426
rtpenc.h
avformat.h
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition:
avformat.h:1328
ff_h263_find_resync_marker_reverse
const uint8_t * ff_h263_find_resync_marker_reverse(const uint8_t *restrict start, const uint8_t *restrict end)
Definition:
rtpenc_h263.c:26
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