rtpenc_vp8.c
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1 /*
2  * RTP VP8 Packetizer
3  * Copyright (c) 2010 Josh Allmann
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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://www.webmproject.org/code/specs/rtp/ ) */
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;
30 
31  s->buf_ptr = s->buf;
32  s->timestamp = s->cur_timestamp;
33  max_packet_size = s->max_payload_size - 1; // minus one for header byte
34 
35  *s->buf_ptr++ = 1; // 0b1 indicates start of frame
36  while (size > 0) {
37  len = FFMIN(size, max_packet_size);
38 
39  memcpy(s->buf_ptr, buf, len);
40  ff_rtp_send_data(s1, s->buf, len+1, size == len); // marker bit is last packet in frame
41 
42  size -= len;
43  buf += len;
44  s->buf_ptr = s->buf;
45  *s->buf_ptr++ = 0; // payload descriptor
46  }
47 }