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libavformat
rtpenc_amr.c
Go to the documentation of this file.
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/*
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* RTP packetization for AMR audio
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* Copyright (c) 2007 Luca Abeni
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* Copyright (c) 2009 Martin Storsjo
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "
avformat.h
"
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#include "
rtpenc.h
"
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void
ff_rtp_send_amr
(
AVFormatContext
*s1,
const
uint8_t
*buff,
int
size
)
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{
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RTPMuxContext
*s = s1->
priv_data
;
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int
max_header_toc_size = 1 + s->
max_frames_per_packet
;
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uint8_t
*p;
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int
len
;
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/* Test if the packet must be sent. */
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len = s->
buf_ptr
- s->
buf
;
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if
(s->
num_frames
== s->
max_frames_per_packet
|| (len && len + size - 1 > s->
max_payload_size
)) {
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int
header_size = s->
num_frames
+ 1;
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p = s->
buf
+ max_header_toc_size - header_size;
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if
(p != s->
buf
)
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memmove(p, s->
buf
, header_size);
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ff_rtp_send_data
(s1, p, s->
buf_ptr
- p, 1);
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s->
num_frames
= 0;
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}
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if
(!s->
num_frames
) {
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s->
buf
[0] = 0xf0;
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s->
buf_ptr
= s->
buf
+ max_header_toc_size;
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s->
timestamp
= s->
cur_timestamp
;
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}
else
{
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/* Mark the previous TOC entry as having more entries following. */
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s->
buf
[1 + s->
num_frames
- 1] |= 0x80;
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}
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/* Copy the frame type and quality bits. */
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s->
buf
[1 + s->
num_frames
++] = buff[0] & 0x7C;
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buff++;
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size--;
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memcpy(s->
buf_ptr
, buff, size);
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s->
buf_ptr
+=
size
;
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}
size
int size
Definition:
twinvq_data.h:11134
RTPMuxContext::max_payload_size
int max_payload_size
Definition:
rtpenc.h:38
AVFormatContext
Format I/O context.
Definition:
avformat.h:922
uint8_t
uint8_t
Definition:
audio_convert.c:194
RTPMuxContext::max_frames_per_packet
int max_frames_per_packet
Definition:
rtpenc.h:52
RTPMuxContext::buf
uint8_t * buf
Definition:
rtpenc.h:49
rtpenc.h
ff_rtp_send_amr
void ff_rtp_send_amr(AVFormatContext *s1, const uint8_t *buff, int size)
Packetize AMR frames into RTP packets according to RFC 3267, in octet-aligned mode.
Definition:
rtpenc_amr.c:30
ff_rtp_send_data
void ff_rtp_send_data(AVFormatContext *s1, const uint8_t *buf1, int len, int m)
Definition:
rtpenc.c:313
RTPMuxContext
Definition:
rtpenc.h:27
RTPMuxContext::cur_timestamp
uint32_t cur_timestamp
Definition:
rtpenc.h:37
RTPMuxContext::num_frames
int num_frames
Definition:
rtpenc.h:39
RTPMuxContext::buf_ptr
uint8_t * buf_ptr
Definition:
rtpenc.h:50
avformat.h
Main libavformat public API header.
RTPMuxContext::timestamp
uint32_t timestamp
Definition:
rtpenc.h:35
len
int len
Definition:
vorbis_enc_data.h:452
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition:
avformat.h:950
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