mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
119 lines
3.6 KiB
C
119 lines
3.6 KiB
C
/*
|
|
* RTP packetization for MPEG video
|
|
* Copyright (c) 2002 Fabrice Bellard.
|
|
* Copyright (c) 2007 Luca Abeni.
|
|
*
|
|
* 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 "libavcodec/mpegvideo.h"
|
|
#include "avformat.h"
|
|
#include "rtp_internal.h"
|
|
|
|
/* NOTE: a single frame must be passed with sequence header if
|
|
needed. XXX: use slices. */
|
|
void ff_rtp_send_mpegvideo(AVFormatContext *s1, const uint8_t *buf1, int size)
|
|
{
|
|
RTPDemuxContext *s = s1->priv_data;
|
|
int len, h, max_packet_size;
|
|
uint8_t *q;
|
|
int begin_of_slice, end_of_slice, frame_type, temporal_reference;
|
|
|
|
max_packet_size = s->max_payload_size;
|
|
begin_of_slice = 1;
|
|
end_of_slice = 0;
|
|
frame_type = 0;
|
|
temporal_reference = 0;
|
|
|
|
while (size > 0) {
|
|
int begin_of_sequence;
|
|
|
|
begin_of_sequence = 0;
|
|
len = max_packet_size - 4;
|
|
|
|
if (len >= size) {
|
|
len = size;
|
|
end_of_slice = 1;
|
|
} else {
|
|
const uint8_t *r, *r1;
|
|
int start_code;
|
|
|
|
r1 = buf1;
|
|
while (1) {
|
|
start_code = -1;
|
|
r = ff_find_start_code(r1, buf1 + size, &start_code);
|
|
if((start_code & 0xFFFFFF00) == 0x100) {
|
|
/* New start code found */
|
|
if (start_code == 0x100) {
|
|
frame_type = (r[1] & 0x38) >> 3;
|
|
temporal_reference = (int)r[0] << 2 | r[1] >> 6;
|
|
}
|
|
if (start_code == 0x1B8) {
|
|
begin_of_sequence = 1;
|
|
}
|
|
|
|
if (r - buf1 - 4 <= len) {
|
|
/* The current slice fits in the packet */
|
|
if (begin_of_slice == 0) {
|
|
/* no slice at the beginning of the packet... */
|
|
end_of_slice = 1;
|
|
len = r - buf1 - 4;
|
|
break;
|
|
}
|
|
r1 = r;
|
|
} else {
|
|
if ((r1 - buf1 > 4) && (r - r1 < max_packet_size)) {
|
|
len = r1 - buf1 - 4;
|
|
end_of_slice = 1;
|
|
}
|
|
break;
|
|
}
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
h = 0;
|
|
h |= temporal_reference << 16;
|
|
h |= begin_of_sequence << 13;
|
|
h |= begin_of_slice << 12;
|
|
h |= end_of_slice << 11;
|
|
h |= frame_type << 8;
|
|
|
|
q = s->buf;
|
|
*q++ = h >> 24;
|
|
*q++ = h >> 16;
|
|
*q++ = h >> 8;
|
|
*q++ = h;
|
|
|
|
memcpy(q, buf1, len);
|
|
q += len;
|
|
|
|
/* 90kHz time stamp */
|
|
s->timestamp = s->cur_timestamp;
|
|
ff_rtp_send_data(s1, s->buf, q - s->buf, (len == size));
|
|
|
|
buf1 += len;
|
|
size -= len;
|
|
begin_of_slice = end_of_slice;
|
|
end_of_slice = 0;
|
|
}
|
|
}
|
|
|
|
|