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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
*
av_restrict
start,
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const
uint8_t
*
av_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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}
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