blob: 671d24575836b664f40a7b2ab0841689cac2b0a8
1 | /* |
2 | * RTP VP8 Packetizer |
3 | * Copyright (c) 2010 Josh Allmann |
4 | * |
5 | * This file is part of FFmpeg. |
6 | * |
7 | * FFmpeg is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU Lesser General Public |
9 | * License as published by the Free Software Foundation; either |
10 | * version 2.1 of the License, or (at your option) any later version. |
11 | * |
12 | * FFmpeg is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | * Lesser General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU Lesser General Public |
18 | * License along with FFmpeg; if not, write to the Free Software |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
20 | */ |
21 | |
22 | #include "rtpenc.h" |
23 | |
24 | /* Based on a draft spec for VP8 RTP. |
25 | * ( http://tools.ietf.org/html/draft-ietf-payload-vp8-05 ) */ |
26 | void ff_rtp_send_vp8(AVFormatContext *s1, const uint8_t *buf, int size) |
27 | { |
28 | RTPMuxContext *s = s1->priv_data; |
29 | int len, max_packet_size, header_size; |
30 | |
31 | s->buf_ptr = s->buf; |
32 | s->timestamp = s->cur_timestamp; |
33 | |
34 | // extended control bit set, reference frame, start of partition, |
35 | // partition id 0 |
36 | *s->buf_ptr++ = 0x90; |
37 | *s->buf_ptr++ = 0x80; // Picture id present |
38 | *s->buf_ptr++ = s->frame_count++ & 0x7f; |
39 | // Calculate the number of remaining bytes |
40 | header_size = s->buf_ptr - s->buf; |
41 | max_packet_size = s->max_payload_size - header_size; |
42 | |
43 | while (size > 0) { |
44 | len = FFMIN(size, max_packet_size); |
45 | |
46 | memcpy(s->buf_ptr, buf, len); |
47 | // marker bit is last packet in frame |
48 | ff_rtp_send_data(s1, s->buf, len + header_size, size == len); |
49 | |
50 | size -= len; |
51 | buf += len; |
52 | // Clear the partition start bit, keep the rest of the header untouched |
53 | s->buf[0] &= ~0x10; |
54 | } |
55 | } |
56 |