| /* |
| * 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++ & 0x7f; |
| // 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; |
| } |
| } |