mirror of
https://github.com/xenia-project/FFmpeg.git
synced 2024-11-30 06:50:44 +00:00
b78e7197a8
and fix GPL/LGPL version mismatches. Originally committed as revision 6577 to svn://svn.ffmpeg.org/ffmpeg/trunk
124 lines
3.4 KiB
C
124 lines
3.4 KiB
C
/*
|
|
* ADTS muxer.
|
|
* Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
|
|
* Mans Rullgard <mru@inprovide.com>
|
|
*
|
|
* 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 "avformat.h"
|
|
#include "bitstream.h"
|
|
|
|
#define ADTS_HEADER_SIZE 7
|
|
|
|
typedef struct {
|
|
int write_adts;
|
|
int objecttype;
|
|
int sample_rate_index;
|
|
int channel_conf;
|
|
} ADTSContext;
|
|
|
|
static int decode_extradata(ADTSContext *adts, uint8_t *buf, int size)
|
|
{
|
|
GetBitContext gb;
|
|
|
|
init_get_bits(&gb, buf, size * 8);
|
|
adts->objecttype = get_bits(&gb, 5) - 1;
|
|
adts->sample_rate_index = get_bits(&gb, 4);
|
|
adts->channel_conf = get_bits(&gb, 4);
|
|
|
|
adts->write_adts = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int adts_write_header(AVFormatContext *s)
|
|
{
|
|
ADTSContext *adts = s->priv_data;
|
|
AVCodecContext *avc = s->streams[0]->codec;
|
|
|
|
if(avc->extradata_size > 0)
|
|
decode_extradata(adts, avc->extradata, avc->extradata_size);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int adts_write_frame_header(AVFormatContext *s, int size)
|
|
{
|
|
ADTSContext *ctx = s->priv_data;
|
|
PutBitContext pb;
|
|
uint8_t buf[ADTS_HEADER_SIZE];
|
|
|
|
init_put_bits(&pb, buf, ADTS_HEADER_SIZE);
|
|
|
|
/* adts_fixed_header */
|
|
put_bits(&pb, 12, 0xfff); /* syncword */
|
|
put_bits(&pb, 1, 0); /* ID */
|
|
put_bits(&pb, 2, 0); /* layer */
|
|
put_bits(&pb, 1, 1); /* protection_absent */
|
|
put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */
|
|
put_bits(&pb, 4, ctx->sample_rate_index);
|
|
put_bits(&pb, 1, 0); /* private_bit */
|
|
put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */
|
|
put_bits(&pb, 1, 0); /* original_copy */
|
|
put_bits(&pb, 1, 0); /* home */
|
|
|
|
/* adts_variable_header */
|
|
put_bits(&pb, 1, 0); /* copyright_identification_bit */
|
|
put_bits(&pb, 1, 0); /* copyright_identification_start */
|
|
put_bits(&pb, 13, ADTS_HEADER_SIZE + size); /* aac_frame_length */
|
|
put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */
|
|
put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */
|
|
|
|
flush_put_bits(&pb);
|
|
put_buffer(&s->pb, buf, ADTS_HEADER_SIZE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int adts_write_trailer(AVFormatContext *s)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
ADTSContext *adts = s->priv_data;
|
|
ByteIOContext *pb = &s->pb;
|
|
|
|
if (!pkt->size)
|
|
return 0;
|
|
if(adts->write_adts)
|
|
adts_write_frame_header(s, pkt->size);
|
|
put_buffer(pb, pkt->data, pkt->size);
|
|
put_flush_packet(pb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVOutputFormat adts_muxer = {
|
|
"adts",
|
|
"ADTS AAC",
|
|
"audio/aac",
|
|
"aac",
|
|
sizeof(ADTSContext),
|
|
CODEC_ID_AAC,
|
|
CODEC_ID_NONE,
|
|
adts_write_header,
|
|
adts_write_packet,
|
|
adts_write_trailer,
|
|
};
|