Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 | } |