mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-14 21:35:06 +02:00
![Michael Niedermayer](/assets/img/avatar_default.png)
* commit 'f792d3cbb8e8e35c54a9358a55dd596b7a40f228': lavf: add the notimestamps flag to the muxers missing it Conflicts: libavformat/adtsenc.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
232 lines
7.3 KiB
C
232 lines
7.3 KiB
C
/*
|
|
* LATM/LOAS muxer
|
|
* Copyright (c) 2011 Kieran Kunhya <kieran@kunhya.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 "rawenc.h"
|
|
|
|
#define MAX_EXTRADATA_SIZE 1024
|
|
|
|
typedef struct {
|
|
AVClass *av_class;
|
|
int off;
|
|
int channel_conf;
|
|
int object_type;
|
|
int counter;
|
|
int mod;
|
|
uint8_t buffer[0x1fff + MAX_EXTRADATA_SIZE + 1024];
|
|
} LATMContext;
|
|
|
|
static const AVOption options[] = {
|
|
{"smc-interval", "StreamMuxConfig interval.",
|
|
offsetof(LATMContext, mod), AV_OPT_TYPE_INT, {.i64 = 0x0014}, 0x0001, 0xffff, AV_OPT_FLAG_ENCODING_PARAM},
|
|
{NULL},
|
|
};
|
|
|
|
static const AVClass latm_muxer_class = {
|
|
.class_name = "LATM/LOAS muxer",
|
|
.item_name = av_default_item_name,
|
|
.option = options,
|
|
.version = LIBAVUTIL_VERSION_INT,
|
|
};
|
|
|
|
static int latm_decode_extradata(LATMContext *ctx, uint8_t *buf, int size)
|
|
{
|
|
MPEG4AudioConfig m4ac;
|
|
|
|
if (size > MAX_EXTRADATA_SIZE) {
|
|
av_log(ctx, AV_LOG_ERROR, "Extradata is larger than currently supported.\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
ctx->off = avpriv_mpeg4audio_get_config(&m4ac, buf, size * 8, 1);
|
|
if (ctx->off < 0)
|
|
return ctx->off;
|
|
|
|
if (ctx->object_type == AOT_ALS && (ctx->off & 7)) {
|
|
// as long as avpriv_mpeg4audio_get_config works correctly this is impossible
|
|
av_log(ctx, AV_LOG_ERROR, "BUG: ALS offset is not byte-aligned\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
/* FIXME: are any formats not allowed in LATM? */
|
|
|
|
if (m4ac.object_type > AOT_SBR && m4ac.object_type != AOT_ALS) {
|
|
av_log(ctx, AV_LOG_ERROR, "Muxing MPEG-4 AOT %d in LATM is not supported\n", m4ac.object_type);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
ctx->channel_conf = m4ac.chan_config;
|
|
ctx->object_type = m4ac.object_type;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int latm_write_header(AVFormatContext *s)
|
|
{
|
|
LATMContext *ctx = s->priv_data;
|
|
AVCodecContext *avctx = s->streams[0]->codec;
|
|
|
|
if (avctx->codec_id == AV_CODEC_ID_AAC_LATM)
|
|
return 0;
|
|
|
|
if (avctx->extradata_size > 0 &&
|
|
latm_decode_extradata(ctx, avctx->extradata, avctx->extradata_size) < 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void latm_write_frame_header(AVFormatContext *s, PutBitContext *bs)
|
|
{
|
|
LATMContext *ctx = s->priv_data;
|
|
AVCodecContext *avctx = s->streams[0]->codec;
|
|
int header_size;
|
|
|
|
/* AudioMuxElement */
|
|
put_bits(bs, 1, !!ctx->counter);
|
|
|
|
if (!ctx->counter) {
|
|
/* StreamMuxConfig */
|
|
put_bits(bs, 1, 0); /* audioMuxVersion */
|
|
put_bits(bs, 1, 1); /* allStreamsSameTimeFraming */
|
|
put_bits(bs, 6, 0); /* numSubFrames */
|
|
put_bits(bs, 4, 0); /* numProgram */
|
|
put_bits(bs, 3, 0); /* numLayer */
|
|
|
|
/* AudioSpecificConfig */
|
|
if (ctx->object_type == AOT_ALS) {
|
|
header_size = avctx->extradata_size-(ctx->off >> 3);
|
|
avpriv_copy_bits(bs, &avctx->extradata[ctx->off >> 3], header_size);
|
|
} else {
|
|
// + 3 assumes not scalable and dependsOnCoreCoder == 0,
|
|
// see decode_ga_specific_config in libavcodec/aacdec.c
|
|
avpriv_copy_bits(bs, avctx->extradata, ctx->off + 3);
|
|
|
|
if (!ctx->channel_conf) {
|
|
GetBitContext gb;
|
|
init_get_bits8(&gb, avctx->extradata, avctx->extradata_size);
|
|
skip_bits_long(&gb, ctx->off + 3);
|
|
avpriv_copy_pce_data(bs, &gb);
|
|
}
|
|
}
|
|
|
|
put_bits(bs, 3, 0); /* frameLengthType */
|
|
put_bits(bs, 8, 0xff); /* latmBufferFullness */
|
|
|
|
put_bits(bs, 1, 0); /* otherDataPresent */
|
|
put_bits(bs, 1, 0); /* crcCheckPresent */
|
|
}
|
|
|
|
ctx->counter++;
|
|
ctx->counter %= ctx->mod;
|
|
}
|
|
|
|
static int latm_write_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
LATMContext *ctx = s->priv_data;
|
|
AVIOContext *pb = s->pb;
|
|
PutBitContext bs;
|
|
int i, len;
|
|
uint8_t loas_header[] = "\x56\xe0\x00";
|
|
|
|
if (s->streams[0]->codec->codec_id == AV_CODEC_ID_AAC_LATM)
|
|
return ff_raw_write_packet(s, pkt);
|
|
|
|
if (pkt->size > 2 && pkt->data[0] == 0xff && (pkt->data[1] >> 4) == 0xf) {
|
|
av_log(s, AV_LOG_ERROR, "ADTS header detected - ADTS will not be incorrectly muxed into LATM\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (!s->streams[0]->codec->extradata) {
|
|
if(pkt->size > 2 && pkt->data[0] == 0x56 && (pkt->data[1] >> 4) == 0xe &&
|
|
(AV_RB16(pkt->data + 1) & 0x1FFF) + 3 == pkt->size)
|
|
return ff_raw_write_packet(s, pkt);
|
|
else
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if (pkt->size > 0x1fff)
|
|
goto too_large;
|
|
|
|
init_put_bits(&bs, ctx->buffer, pkt->size+1024+MAX_EXTRADATA_SIZE);
|
|
|
|
latm_write_frame_header(s, &bs);
|
|
|
|
/* PayloadLengthInfo() */
|
|
for (i = 0; i <= pkt->size-255; i+=255)
|
|
put_bits(&bs, 8, 255);
|
|
|
|
put_bits(&bs, 8, pkt->size-i);
|
|
|
|
/* The LATM payload is written unaligned */
|
|
|
|
/* PayloadMux() */
|
|
if (pkt->size && (pkt->data[0] & 0xe1) == 0x81) {
|
|
// Convert byte-aligned DSE to non-aligned.
|
|
// Due to the input format encoding we know that
|
|
// it is naturally byte-aligned in the input stream,
|
|
// so there are no padding bits to account for.
|
|
// To avoid having to add padding bits and rearrange
|
|
// the whole stream we just remove the byte-align flag.
|
|
// This allows us to remux our FATE AAC samples into latm
|
|
// files that are still playable with minimal effort.
|
|
put_bits(&bs, 8, pkt->data[0] & 0xfe);
|
|
avpriv_copy_bits(&bs, pkt->data + 1, 8*pkt->size - 8);
|
|
} else
|
|
avpriv_copy_bits(&bs, pkt->data, 8*pkt->size);
|
|
|
|
avpriv_align_put_bits(&bs);
|
|
flush_put_bits(&bs);
|
|
|
|
len = put_bits_count(&bs) >> 3;
|
|
|
|
if (len > 0x1fff)
|
|
goto too_large;
|
|
|
|
loas_header[1] |= (len >> 8) & 0x1f;
|
|
loas_header[2] |= len & 0xff;
|
|
|
|
avio_write(pb, loas_header, 3);
|
|
avio_write(pb, ctx->buffer, len);
|
|
|
|
return 0;
|
|
|
|
too_large:
|
|
av_log(s, AV_LOG_ERROR, "LATM packet size larger than maximum size 0x1fff\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
AVOutputFormat ff_latm_muxer = {
|
|
.name = "latm",
|
|
.long_name = NULL_IF_CONFIG_SMALL("LOAS/LATM"),
|
|
.mime_type = "audio/MP4A-LATM",
|
|
.extensions = "latm,loas",
|
|
.priv_data_size = sizeof(LATMContext),
|
|
.audio_codec = AV_CODEC_ID_AAC,
|
|
.video_codec = AV_CODEC_ID_NONE,
|
|
.write_header = latm_write_header,
|
|
.write_packet = latm_write_packet,
|
|
.priv_class = &latm_muxer_class,
|
|
.flags = AVFMT_NOTIMESTAMPS,
|
|
};
|