2006-02-10 02:24:32 +01:00
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/*
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* ADTS muxer.
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* Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
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2007-07-05 22:08:51 +02:00
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* Mans Rullgard <mans@mansr.com>
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2006-02-10 02:24:32 +01:00
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*
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2006-10-07 17:30:46 +02:00
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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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2006-02-10 02:24:32 +01:00
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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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2006-10-07 17:30:46 +02:00
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* version 2.1 of the License, or (at your option) any later version.
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2006-02-10 02:24:32 +01:00
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*
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2006-10-07 17:30:46 +02:00
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* FFmpeg is distributed in the hope that it will be useful,
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2006-02-10 02:24:32 +01:00
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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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2006-10-07 17:30:46 +02:00
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* License along with FFmpeg; if not, write to the Free Software
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2006-02-10 02:24:32 +01:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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2008-05-09 13:56:36 +02:00
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2009-04-13 18:20:26 +02:00
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#include "libavcodec/get_bits.h"
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2009-04-12 10:35:26 +02:00
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#include "libavcodec/put_bits.h"
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2021-05-21 19:16:10 +02:00
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#include "libavcodec/codec_id.h"
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#include "libavcodec/codec_par.h"
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#include "libavcodec/packet.h"
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2010-07-01 16:49:32 +02:00
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#include "libavcodec/mpeg4audio.h"
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2013-07-12 01:40:17 +02:00
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#include "libavutil/opt.h"
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2006-02-10 02:24:32 +01:00
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#include "avformat.h"
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2013-07-12 01:40:17 +02:00
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#include "apetag.h"
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2014-07-21 21:05:08 +02:00
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#include "id3v2.h"
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2012-05-29 14:48:38 +02:00
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#define ADTS_HEADER_SIZE 7
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2014-09-22 09:19:33 +02:00
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typedef struct ADTSContext {
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2013-07-12 01:40:17 +02:00
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AVClass *class;
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2012-05-29 14:48:38 +02:00
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int write_adts;
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int objecttype;
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int sample_rate_index;
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int channel_conf;
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int pce_size;
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2013-07-12 01:40:17 +02:00
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int apetag;
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2014-07-21 21:05:08 +02:00
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int id3v2tag;
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2020-08-29 13:57:13 +02:00
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int mpeg_id;
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2012-05-29 14:48:38 +02:00
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uint8_t pce_data[MAX_PCE_SIZE];
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} ADTSContext;
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2006-02-10 02:24:32 +01:00
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2021-04-25 18:47:29 +02:00
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#define ADTS_MAX_FRAME_BYTES ((1 << 14) - 1)
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2011-11-28 09:48:53 +01:00
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2014-09-22 18:47:14 +02:00
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static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const uint8_t *buf, int size)
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2006-02-10 02:24:32 +01:00
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{
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GetBitContext gb;
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2009-05-14 00:59:58 +02:00
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PutBitContext pb;
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2010-07-01 16:49:32 +02:00
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MPEG4AudioConfig m4ac;
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2021-08-04 22:15:18 +02:00
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int off, ret;
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2006-02-10 02:24:32 +01:00
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2021-08-04 22:15:18 +02:00
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ret = init_get_bits8(&gb, buf, size);
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if (ret < 0)
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return ret;
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2019-09-22 01:06:48 +02:00
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off = avpriv_mpeg4audio_get_config2(&m4ac, buf, size, 1, s);
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2010-07-01 16:49:32 +02:00
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if (off < 0)
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return off;
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skip_bits_long(&gb, off);
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adts->objecttype = m4ac.object_type - 1;
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adts->sample_rate_index = m4ac.sampling_index;
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adts->channel_conf = m4ac.chan_config;
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2006-02-10 02:24:32 +01:00
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2009-03-06 22:19:16 +01:00
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if (adts->objecttype > 3U) {
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2009-02-13 04:51:15 +01:00
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av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
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2014-08-15 13:37:24 +02:00
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return AVERROR_INVALIDDATA;
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2009-02-13 00:51:08 +01:00
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}
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if (adts->sample_rate_index == 15) {
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av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
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2014-08-15 13:37:24 +02:00
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return AVERROR_INVALIDDATA;
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2009-02-13 00:51:08 +01:00
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}
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2009-03-06 22:19:16 +01:00
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if (get_bits(&gb, 1)) {
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av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n");
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2014-08-15 13:37:24 +02:00
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return AVERROR_INVALIDDATA;
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2009-03-06 22:19:16 +01:00
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}
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if (get_bits(&gb, 1)) {
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av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n");
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2014-08-15 13:37:24 +02:00
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return AVERROR_INVALIDDATA;
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2009-03-06 22:19:16 +01:00
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}
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2011-06-29 22:41:47 +02:00
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if (get_bits(&gb, 1)) {
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av_log(s, AV_LOG_ERROR, "Extension flag is not allowed in ADTS\n");
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2014-08-15 13:37:24 +02:00
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return AVERROR_INVALIDDATA;
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2011-06-29 22:41:47 +02:00
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}
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2009-05-14 00:59:58 +02:00
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if (!adts->channel_conf) {
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init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);
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put_bits(&pb, 3, 5); //ID_PCE
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2017-03-16 17:34:12 +01:00
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adts->pce_size = (ff_copy_pce_data(&pb, &gb) + 3) / 8;
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2009-05-14 00:59:58 +02:00
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flush_put_bits(&pb);
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}
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2009-02-13 00:51:08 +01:00
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2006-02-10 02:24:32 +01:00
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adts->write_adts = 1;
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return 0;
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}
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2017-05-29 23:12:51 +02:00
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static int adts_init(AVFormatContext *s)
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2006-02-10 02:24:32 +01:00
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{
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ADTSContext *adts = s->priv_data;
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lavf: replace AVStream.codec with AVStream.codecpar
Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.
In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.
There are multiple important problems with this approach:
- the fields in AVCodecContext are in general one of
* stream parameters
* codec options
* codec state
However, it's not clear which ones are which. It is consequently
unclear which fields are a demuxer allowed to set or a muxer allowed to
read. This leads to erratic behaviour depending on whether decoding or
encoding is being performed or not (and whether it uses the AVStream
embedded codec context).
- various synchronization issues arising from the fact that the same
context is used by several different APIs (muxers/demuxers,
parsers, bitstream filters and encoders/decoders) simultaneously, with
there being no clear rules for who can modify what and the different
processes being typically delayed with respect to each other.
- avformat_find_stream_info() making it necessary to support opening
and closing a single codec context multiple times, thus
complicating the semantics of freeing various allocated objects in the
codec context.
Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 20:42:52 +02:00
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AVCodecParameters *par = s->streams[0]->codecpar;
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2006-02-10 02:24:32 +01:00
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2018-01-14 13:00:23 +01:00
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if (par->codec_id != AV_CODEC_ID_AAC) {
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av_log(s, AV_LOG_ERROR, "Only AAC streams can be muxed by the ADTS muxer\n");
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return AVERROR(EINVAL);
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}
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lavf: replace AVStream.codec with AVStream.codecpar
Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.
In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.
There are multiple important problems with this approach:
- the fields in AVCodecContext are in general one of
* stream parameters
* codec options
* codec state
However, it's not clear which ones are which. It is consequently
unclear which fields are a demuxer allowed to set or a muxer allowed to
read. This leads to erratic behaviour depending on whether decoding or
encoding is being performed or not (and whether it uses the AVStream
embedded codec context).
- various synchronization issues arising from the fact that the same
context is used by several different APIs (muxers/demuxers,
parsers, bitstream filters and encoders/decoders) simultaneously, with
there being no clear rules for who can modify what and the different
processes being typically delayed with respect to each other.
- avformat_find_stream_info() making it necessary to support opening
and closing a single codec context multiple times, thus
complicating the semantics of freeing various allocated objects in the
codec context.
Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 20:42:52 +02:00
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if (par->extradata_size > 0)
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return adts_decode_extradata(s, adts, par->extradata,
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par->extradata_size);
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2006-02-10 02:24:32 +01:00
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return 0;
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}
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2017-05-29 23:12:51 +02:00
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static int adts_write_header(AVFormatContext *s)
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{
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ADTSContext *adts = s->priv_data;
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if (adts->id3v2tag)
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ff_id3v2_write_simple(s, 4, ID3v2_DEFAULT_MAGIC);
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return 0;
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}
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2012-05-29 14:48:38 +02:00
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static int adts_write_frame_header(ADTSContext *ctx,
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uint8_t *buf, int size, int pce_size)
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2006-02-10 02:24:32 +01:00
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{
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PutBitContext pb;
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2011-11-28 09:48:53 +01:00
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unsigned full_frame_size = (unsigned)ADTS_HEADER_SIZE + size + pce_size;
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if (full_frame_size > ADTS_MAX_FRAME_BYTES) {
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av_log(NULL, AV_LOG_ERROR, "ADTS frame size too large: %u (max %d)\n",
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full_frame_size, ADTS_MAX_FRAME_BYTES);
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return AVERROR_INVALIDDATA;
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}
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2006-02-10 02:24:32 +01:00
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init_put_bits(&pb, buf, ADTS_HEADER_SIZE);
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/* adts_fixed_header */
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put_bits(&pb, 12, 0xfff); /* syncword */
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2020-08-29 13:57:13 +02:00
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put_bits(&pb, 1, ctx->mpeg_id); /* ID */
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2006-02-10 02:24:32 +01:00
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put_bits(&pb, 2, 0); /* layer */
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put_bits(&pb, 1, 1); /* protection_absent */
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put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */
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put_bits(&pb, 4, ctx->sample_rate_index);
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put_bits(&pb, 1, 0); /* private_bit */
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put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */
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put_bits(&pb, 1, 0); /* original_copy */
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put_bits(&pb, 1, 0); /* home */
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/* adts_variable_header */
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put_bits(&pb, 1, 0); /* copyright_identification_bit */
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put_bits(&pb, 1, 0); /* copyright_identification_start */
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2011-11-28 09:48:53 +01:00
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put_bits(&pb, 13, full_frame_size); /* aac_frame_length */
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2006-02-10 02:24:32 +01:00
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put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */
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put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */
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flush_put_bits(&pb);
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return 0;
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}
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static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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ADTSContext *adts = s->priv_data;
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2017-05-24 22:02:08 +02:00
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AVCodecParameters *par = s->streams[0]->codecpar;
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2011-02-20 11:04:12 +01:00
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AVIOContext *pb = s->pb;
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2010-03-09 01:18:49 +01:00
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uint8_t buf[ADTS_HEADER_SIZE];
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2006-02-10 02:24:32 +01:00
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2006-03-27 18:43:04 +02:00
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if (!pkt->size)
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return 0;
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2017-05-24 22:02:08 +02:00
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if (!par->extradata_size) {
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uint8_t *side_data;
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2021-04-14 14:59:32 +02:00
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size_t side_data_size;
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2021-03-06 17:29:54 +01:00
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int ret;
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2017-05-24 22:02:08 +02:00
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side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
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&side_data_size);
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if (side_data_size) {
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ret = adts_decode_extradata(s, adts, side_data, side_data_size);
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if (ret < 0)
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return ret;
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ret = ff_alloc_extradata(par, side_data_size);
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if (ret < 0)
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return ret;
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memcpy(par->extradata, side_data, side_data_size);
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}
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}
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2010-07-07 22:03:15 +02:00
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if (adts->write_adts) {
|
2012-05-29 14:48:38 +02:00
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int err = adts_write_frame_header(adts, buf, pkt->size,
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2011-11-28 09:48:53 +01:00
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adts->pce_size);
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if (err < 0)
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return err;
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2011-02-21 19:28:17 +01:00
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avio_write(pb, buf, ADTS_HEADER_SIZE);
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2010-07-07 22:03:15 +02:00
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if (adts->pce_size) {
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2011-02-21 19:28:17 +01:00
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avio_write(pb, adts->pce_data, adts->pce_size);
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2010-03-09 01:18:49 +01:00
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adts->pce_size = 0;
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}
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}
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2011-02-21 19:28:17 +01:00
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avio_write(pb, pkt->data, pkt->size);
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2006-02-10 02:24:32 +01:00
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return 0;
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}
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|
2013-07-12 01:40:17 +02:00
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static int adts_write_trailer(AVFormatContext *s)
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{
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ADTSContext *adts = s->priv_data;
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if (adts->apetag)
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ff_ape_write_tag(s);
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return 0;
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}
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#define ENC AV_OPT_FLAG_ENCODING_PARAM
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#define OFFSET(obj) offsetof(ADTSContext, obj)
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static const AVOption options[] = {
|
2021-04-27 05:51:43 +02:00
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{ "write_id3v2", "Enable ID3v2 tag writing", OFFSET(id3v2tag), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
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{ "write_apetag", "Enable APE tag writing", OFFSET(apetag), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
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{ "write_mpeg2", "Set MPEG version to MPEG-2", OFFSET(mpeg_id), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
|
2013-07-12 01:40:17 +02:00
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{ NULL },
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};
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static const AVClass adts_muxer_class = {
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.class_name = "ADTS muxer",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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|
2021-04-19 19:45:24 +02:00
|
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|
const AVOutputFormat ff_adts_muxer = {
|
2011-07-16 22:18:12 +02:00
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.name = "adts",
|
2012-07-24 03:23:48 +02:00
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|
.long_name = NULL_IF_CONFIG_SMALL("ADTS AAC (Advanced Audio Coding)"),
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2011-07-16 22:18:12 +02:00
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.mime_type = "audio/aac",
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.extensions = "aac,adts",
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.priv_data_size = sizeof(ADTSContext),
|
2012-08-05 11:11:04 +02:00
|
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|
.audio_codec = AV_CODEC_ID_AAC,
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.video_codec = AV_CODEC_ID_NONE,
|
2017-05-29 23:12:51 +02:00
|
|
|
.init = adts_init,
|
2011-07-16 22:18:12 +02:00
|
|
|
.write_header = adts_write_header,
|
|
|
|
.write_packet = adts_write_packet,
|
2013-07-12 01:40:17 +02:00
|
|
|
.write_trailer = adts_write_trailer,
|
|
|
|
.priv_class = &adts_muxer_class,
|
2014-05-29 07:06:52 +02:00
|
|
|
.flags = AVFMT_NOTIMESTAMPS,
|
2006-02-10 02:24:32 +01:00
|
|
|
};
|