mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
8ae15b5655
7-bit PictureIDs are not supported by WebRTC: https://groups.google.com/g/discuss-webrtc/c/333-L02vuWA In practice, 15-bit PictureIDs offer better compatibility. Signed-off-by: Kevin Wang <kevin@muxable.com> Signed-off-by: Martin Storsjö <martin@martin.st>
57 lines
1.9 KiB
C
57 lines
1.9 KiB
C
/*
|
|
* RTP VP8 Packetizer
|
|
* Copyright (c) 2010 Josh Allmann
|
|
*
|
|
* 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 "rtpenc.h"
|
|
|
|
/* Based on a draft spec for VP8 RTP.
|
|
* ( http://tools.ietf.org/html/draft-ietf-payload-vp8-05 ) */
|
|
void ff_rtp_send_vp8(AVFormatContext *s1, const uint8_t *buf, int size)
|
|
{
|
|
RTPMuxContext *s = s1->priv_data;
|
|
int len, max_packet_size, header_size;
|
|
|
|
s->buf_ptr = s->buf;
|
|
s->timestamp = s->cur_timestamp;
|
|
|
|
// extended control bit set, reference frame, start of partition,
|
|
// partition id 0
|
|
*s->buf_ptr++ = 0x90;
|
|
*s->buf_ptr++ = 0x80; // Picture id present
|
|
*s->buf_ptr++ = ((s->frame_count & 0x7f00) >> 8) | 0x80;
|
|
*s->buf_ptr++ = s->frame_count++ & 0xff;
|
|
// Calculate the number of remaining bytes
|
|
header_size = s->buf_ptr - s->buf;
|
|
max_packet_size = s->max_payload_size - header_size;
|
|
|
|
while (size > 0) {
|
|
len = FFMIN(size, max_packet_size);
|
|
|
|
memcpy(s->buf_ptr, buf, len);
|
|
// marker bit is last packet in frame
|
|
ff_rtp_send_data(s1, s->buf, len + header_size, size == len);
|
|
|
|
size -= len;
|
|
buf += len;
|
|
// Clear the partition start bit, keep the rest of the header untouched
|
|
s->buf[0] &= ~0x10;
|
|
}
|
|
}
|