FFmpeg
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 & 0x7f00) >> 8) | 0x80;
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*
s
->buf_ptr++ =
s
->frame_count++ & 0xff;
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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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}
ff_rtp_send_data
void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m)
Definition:
rtpenc.c:335
s
#define s(width, name)
Definition:
cbs_vp9.c:198
s1
#define s1
Definition:
regdef.h:38
AVFormatContext
Format I/O context.
Definition:
avformat.h:1115
RTPMuxContext
Definition:
rtpenc.h:27
size
int size
Definition:
twinvq_data.h:10344
FFMIN
#define FFMIN(a, b)
Definition:
macros.h:49
len
int len
Definition:
vorbis_enc_data.h:426
rtpenc.h
ff_rtp_send_vp8
void ff_rtp_send_vp8(AVFormatContext *s1, const uint8_t *buf, int size)
Definition:
rtpenc_vp8.c:26
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