mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
c00cd007e8
All versions of MSVC that support C11 (namely >= v19.27)
also support the restrict keyword, therefore av_restrict
is no longer necessary since 75697836b1.
Reviewed-by: Martin Storsjö <martin@martin.st>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
/*
|
|
* RTP packetization for H.263 video
|
|
* Copyright (c) 2009 Luca Abeni
|
|
* Copyright (c) 2009 Martin Storsjo
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "rtpenc.h"
|
|
|
|
const uint8_t *ff_h263_find_resync_marker_reverse(const uint8_t *restrict start,
|
|
const uint8_t *restrict end)
|
|
{
|
|
const uint8_t *p = end - 1;
|
|
start += 1; /* Make sure we never return the original start. */
|
|
for (; p > start; p -= 2) {
|
|
if (!*p) {
|
|
if (!p[ 1] && p[2]) return p;
|
|
else if (!p[-1] && p[1]) return p - 1;
|
|
}
|
|
}
|
|
return end;
|
|
}
|
|
|
|
/**
|
|
* Packetize H.263 frames into RTP packets according to RFC 4629
|
|
*/
|
|
void ff_rtp_send_h263(AVFormatContext *s1, const uint8_t *buf1, int size)
|
|
{
|
|
RTPMuxContext *s = s1->priv_data;
|
|
int len, max_packet_size;
|
|
uint8_t *q;
|
|
|
|
max_packet_size = s->max_payload_size;
|
|
|
|
while (size > 0) {
|
|
q = s->buf;
|
|
if (size >= 2 && (buf1[0] == 0) && (buf1[1] == 0)) {
|
|
*q++ = 0x04;
|
|
buf1 += 2;
|
|
size -= 2;
|
|
} else {
|
|
*q++ = 0;
|
|
}
|
|
*q++ = 0;
|
|
|
|
len = FFMIN(max_packet_size - 2, size);
|
|
|
|
/* Look for a better place to split the frame into packets. */
|
|
if (len < size) {
|
|
const uint8_t *end = ff_h263_find_resync_marker_reverse(buf1,
|
|
buf1 + len);
|
|
len = end - buf1;
|
|
}
|
|
|
|
memcpy(q, buf1, len);
|
|
q += len;
|
|
|
|
/* 90 KHz time stamp */
|
|
s->timestamp = s->cur_timestamp;
|
|
ff_rtp_send_data(s1, s->buf, q - s->buf, (len == size));
|
|
|
|
buf1 += len;
|
|
size -= len;
|
|
}
|
|
}
|