forked from KolibriOS/kolibrios
212 lines
6.6 KiB
C
212 lines
6.6 KiB
C
|
/*
|
||
|
|
* ADTS muxer.
|
||
|
|
* Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
|
||
|
|
* Mans Rullgard <mans@mansr.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 "libavcodec/get_bits.h"
|
||
|
|
#include "libavcodec/put_bits.h"
|
||
|
|
#include "libavcodec/avcodec.h"
|
||
|
|
#include "libavcodec/mpeg4audio.h"
|
||
|
|
#include "libavutil/opt.h"
|
||
|
|
#include "avformat.h"
|
||
|
|
#include "apetag.h"
|
||
|
|
#include "id3v2.h"
|
||
|
|
|
||
|
|
#define ADTS_HEADER_SIZE 7
|
||
|
|
|
||
|
|
typedef struct ADTSContext {
|
||
|
|
AVClass *class;
|
||
|
|
int write_adts;
|
||
|
|
int objecttype;
|
||
|
|
int sample_rate_index;
|
||
|
|
int channel_conf;
|
||
|
|
int pce_size;
|
||
|
|
int apetag;
|
||
|
|
int id3v2tag;
|
||
|
|
uint8_t pce_data[MAX_PCE_SIZE];
|
||
|
|
} ADTSContext;
|
||
|
|
|
||
|
|
#define ADTS_MAX_FRAME_BYTES ((1 << 13) - 1)
|
||
|
|
|
||
|
|
static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const uint8_t *buf, int size)
|
||
|
|
{
|
||
|
|
GetBitContext gb;
|
||
|
|
PutBitContext pb;
|
||
|
|
MPEG4AudioConfig m4ac;
|
||
|
|
int off;
|
||
|
|
|
||
|
|
init_get_bits(&gb, buf, size * 8);
|
||
|
|
off = avpriv_mpeg4audio_get_config(&m4ac, buf, size * 8, 1);
|
||
|
|
if (off < 0)
|
||
|
|
return off;
|
||
|
|
skip_bits_long(&gb, off);
|
||
|
|
adts->objecttype = m4ac.object_type - 1;
|
||
|
|
adts->sample_rate_index = m4ac.sampling_index;
|
||
|
|
adts->channel_conf = m4ac.chan_config;
|
||
|
|
|
||
|
|
if (adts->objecttype > 3U) {
|
||
|
|
av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
if (adts->sample_rate_index == 15) {
|
||
|
|
av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
if (get_bits(&gb, 1)) {
|
||
|
|
av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n");
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
if (get_bits(&gb, 1)) {
|
||
|
|
av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n");
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
if (get_bits(&gb, 1)) {
|
||
|
|
av_log(s, AV_LOG_ERROR, "Extension flag is not allowed in ADTS\n");
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
if (!adts->channel_conf) {
|
||
|
|
init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);
|
||
|
|
|
||
|
|
put_bits(&pb, 3, 5); //ID_PCE
|
||
|
|
adts->pce_size = (avpriv_copy_pce_data(&pb, &gb) + 3) / 8;
|
||
|
|
flush_put_bits(&pb);
|
||
|
|
}
|
||
|
|
|
||
|
|
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 (adts->id3v2tag)
|
||
|
|
ff_id3v2_write_simple(s, 4, ID3v2_DEFAULT_MAGIC);
|
||
|
|
if (avc->extradata_size > 0)
|
||
|
|
return adts_decode_extradata(s, adts, avc->extradata,
|
||
|
|
avc->extradata_size);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int adts_write_frame_header(ADTSContext *ctx,
|
||
|
|
uint8_t *buf, int size, int pce_size)
|
||
|
|
{
|
||
|
|
PutBitContext pb;
|
||
|
|
|
||
|
|
unsigned full_frame_size = (unsigned)ADTS_HEADER_SIZE + size + pce_size;
|
||
|
|
if (full_frame_size > ADTS_MAX_FRAME_BYTES) {
|
||
|
|
av_log(NULL, AV_LOG_ERROR, "ADTS frame size too large: %u (max %d)\n",
|
||
|
|
full_frame_size, ADTS_MAX_FRAME_BYTES);
|
||
|
|
return AVERROR_INVALIDDATA;
|
||
|
|
}
|
||
|
|
|
||
|
|
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, full_frame_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);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
|
||
|
|
{
|
||
|
|
ADTSContext *adts = s->priv_data;
|
||
|
|
AVIOContext *pb = s->pb;
|
||
|
|
uint8_t buf[ADTS_HEADER_SIZE];
|
||
|
|
|
||
|
|
if (!pkt->size)
|
||
|
|
return 0;
|
||
|
|
if (adts->write_adts) {
|
||
|
|
int err = adts_write_frame_header(adts, buf, pkt->size,
|
||
|
|
adts->pce_size);
|
||
|
|
if (err < 0)
|
||
|
|
return err;
|
||
|
|
avio_write(pb, buf, ADTS_HEADER_SIZE);
|
||
|
|
if (adts->pce_size) {
|
||
|
|
avio_write(pb, adts->pce_data, adts->pce_size);
|
||
|
|
adts->pce_size = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
avio_write(pb, pkt->data, pkt->size);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int adts_write_trailer(AVFormatContext *s)
|
||
|
|
{
|
||
|
|
ADTSContext *adts = s->priv_data;
|
||
|
|
|
||
|
|
if (adts->apetag)
|
||
|
|
ff_ape_write_tag(s);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define ENC AV_OPT_FLAG_ENCODING_PARAM
|
||
|
|
#define OFFSET(obj) offsetof(ADTSContext, obj)
|
||
|
|
static const AVOption options[] = {
|
||
|
|
{ "write_id3v2", "Enable ID3v2 tag writing", OFFSET(id3v2tag), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, ENC},
|
||
|
|
{ "write_apetag", "Enable APE tag writing", OFFSET(apetag), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, ENC},
|
||
|
|
{ NULL },
|
||
|
|
};
|
||
|
|
|
||
|
|
static const AVClass adts_muxer_class = {
|
||
|
|
.class_name = "ADTS muxer",
|
||
|
|
.item_name = av_default_item_name,
|
||
|
|
.option = options,
|
||
|
|
.version = LIBAVUTIL_VERSION_INT,
|
||
|
|
};
|
||
|
|
|
||
|
|
AVOutputFormat ff_adts_muxer = {
|
||
|
|
.name = "adts",
|
||
|
|
.long_name = NULL_IF_CONFIG_SMALL("ADTS AAC (Advanced Audio Coding)"),
|
||
|
|
.mime_type = "audio/aac",
|
||
|
|
.extensions = "aac,adts",
|
||
|
|
.priv_data_size = sizeof(ADTSContext),
|
||
|
|
.audio_codec = AV_CODEC_ID_AAC,
|
||
|
|
.video_codec = AV_CODEC_ID_NONE,
|
||
|
|
.write_header = adts_write_header,
|
||
|
|
.write_packet = adts_write_packet,
|
||
|
|
.write_trailer = adts_write_trailer,
|
||
|
|
.priv_class = &adts_muxer_class,
|
||
|
|
.flags = AVFMT_NOTIMESTAMPS,
|
||
|
|
};
|