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 ) */ 26void 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