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libavformat
rtpenc_vp8.c
Go to the documentation of this file.
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/*
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* RTP VP8 Packetizer
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* Copyright (c) 2010 Josh Allmann
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "
rtpenc.h
"
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/* Based on a draft spec for VP8 RTP.
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* ( http://tools.ietf.org/html/draft-ietf-payload-vp8-05 ) */
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void
ff_rtp_send_vp8
(
AVFormatContext
*
s1
,
const
uint8_t
*
buf
,
int
size
)
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{
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RTPMuxContext
*
s
= s1->
priv_data
;
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int
len
, max_packet_size, header_size;
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s->
buf_ptr
= s->
buf
;
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s->
timestamp
= s->
cur_timestamp
;
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// extended control bit set, reference frame, start of partition,
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// partition id 0
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*s->
buf_ptr
++ = 0x90;
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*s->
buf_ptr
++ = 0x80;
// Picture id present
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*s->
buf_ptr
++ = s->
frame_count
++ & 0x7f;
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// Calculate the number of remaining bytes
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header_size = s->
buf_ptr
- s->
buf
;
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max_packet_size = s->
max_payload_size
- header_size;
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while
(size > 0) {
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len =
FFMIN
(size, max_packet_size);
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memcpy(s->
buf_ptr
, buf, len);
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// marker bit is last packet in frame
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ff_rtp_send_data
(s1, s->
buf
, len + header_size, size == len);
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size -=
len
;
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buf +=
len
;
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// Clear the partition start bit, keep the rest of the header untouched
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s->
buf
[0] &= ~0x10;
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}
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}
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