0,0 → 1,81 |
/* |
* 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 *av_restrict start, |
const uint8_t *av_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; |
} |
} |