yading@11: /*
yading@11:  * RTP VP8 Packetizer
yading@11:  * Copyright (c) 2010 Josh Allmann
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: #include "rtpenc.h"
yading@11: 
yading@11: /* Based on a draft spec for VP8 RTP.
yading@11:  * ( http://tools.ietf.org/html/draft-ietf-payload-vp8-05 ) */
yading@11: void ff_rtp_send_vp8(AVFormatContext *s1, const uint8_t *buf, int size)
yading@11: {
yading@11:     RTPMuxContext *s = s1->priv_data;
yading@11:     int len, max_packet_size, header_size;
yading@11: 
yading@11:     s->buf_ptr      = s->buf;
yading@11:     s->timestamp    = s->cur_timestamp;
yading@11: 
yading@11:     // extended control bit set, reference frame, start of partition,
yading@11:     // partition id 0
yading@11:     *s->buf_ptr++ = 0x90;
yading@11:     *s->buf_ptr++ = 0x80; // Picture id present
yading@11:     *s->buf_ptr++ = s->frame_count++ & 0x7f;
yading@11:     // Calculate the number of remaining bytes
yading@11:     header_size     = s->buf_ptr - s->buf;
yading@11:     max_packet_size = s->max_payload_size - header_size;
yading@11: 
yading@11:     while (size > 0) {
yading@11:         len = FFMIN(size, max_packet_size);
yading@11: 
yading@11:         memcpy(s->buf_ptr, buf, len);
yading@11:         // marker bit is last packet in frame
yading@11:         ff_rtp_send_data(s1, s->buf, len + header_size, size == len);
yading@11: 
yading@11:         size         -= len;
yading@11:         buf          += len;
yading@11:         // Clear the partition start bit, keep the rest of the header untouched
yading@11:         s->buf[0]    &= ~0x10;
yading@11:     }
yading@11: }