2024-03-17 00:34:46 +02:00
|
|
|
/*
|
|
|
|
* AAC decoder
|
|
|
|
* Copyright (c) 2005-2006 Oded Shimon ( ods15 ods15 dyndns org )
|
|
|
|
* Copyright (c) 2006-2007 Maxim Gavrilov ( maxim.gavrilov gmail com )
|
|
|
|
* Copyright (c) 2008-2013 Alex Converse <alex.converse@gmail.com>
|
|
|
|
*
|
|
|
|
* AAC LATM decoder
|
|
|
|
* Copyright (c) 2008-2010 Paul Kendall <paul@kcbbs.gen.nz>
|
|
|
|
* Copyright (c) 2010 Janne Grunau <janne-libav@jannau.net>
|
|
|
|
*
|
|
|
|
* AAC decoder fixed-point implementation
|
|
|
|
* Copyright (c) 2013
|
|
|
|
* MIPS Technologies, Inc., California.
|
|
|
|
*
|
|
|
|
* 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
|
|
|
|
*/
|
|
|
|
|
|
|
|
#ifndef AVCODEC_AAC_AACDEC_LATM_H
|
|
|
|
#define AVCODEC_AAC_AACDEC_LATM_H
|
|
|
|
|
|
|
|
#define LOAS_SYNC_WORD 0x2b7 ///< 11 bits LOAS sync word
|
|
|
|
|
|
|
|
struct LATMContext {
|
|
|
|
AACDecContext aac_ctx; ///< containing AACContext
|
|
|
|
int initialized; ///< initialized after a valid extradata was seen
|
|
|
|
|
|
|
|
// parser data
|
|
|
|
int audio_mux_version_A; ///< LATM syntax version
|
|
|
|
int frame_length_type; ///< 0/1 variable/fixed frame length
|
|
|
|
int frame_length; ///< frame length for fixed frame length
|
|
|
|
};
|
|
|
|
|
|
|
|
static inline uint32_t latm_get_value(GetBitContext *b)
|
|
|
|
{
|
|
|
|
int length = get_bits(b, 2);
|
|
|
|
|
|
|
|
return get_bits_long(b, (length+1)*8);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int latm_decode_audio_specific_config(struct LATMContext *latmctx,
|
|
|
|
GetBitContext *gb, int asclen)
|
|
|
|
{
|
|
|
|
AACDecContext *ac = &latmctx->aac_ctx;
|
|
|
|
AVCodecContext *avctx = ac->avctx;
|
|
|
|
MPEG4AudioConfig m4ac = { 0 };
|
|
|
|
GetBitContext gbc;
|
|
|
|
int config_start_bit = get_bits_count(gb);
|
|
|
|
int sync_extension = 0;
|
|
|
|
int bits_consumed, esize, i;
|
|
|
|
|
|
|
|
if (asclen > 0) {
|
|
|
|
sync_extension = 1;
|
|
|
|
asclen = FFMIN(asclen, get_bits_left(gb));
|
|
|
|
init_get_bits(&gbc, gb->buffer, config_start_bit + asclen);
|
|
|
|
skip_bits_long(&gbc, config_start_bit);
|
|
|
|
} else if (asclen == 0) {
|
|
|
|
gbc = *gb;
|
|
|
|
} else {
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (get_bits_left(gb) <= 0)
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
|
|
|
|
bits_consumed = decode_audio_specific_config_gb(NULL, avctx, &m4ac,
|
|
|
|
&gbc, config_start_bit,
|
|
|
|
sync_extension);
|
|
|
|
|
|
|
|
if (bits_consumed < config_start_bit)
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
bits_consumed -= config_start_bit;
|
|
|
|
|
|
|
|
if (asclen == 0)
|
|
|
|
asclen = bits_consumed;
|
|
|
|
|
|
|
|
if (!latmctx->initialized ||
|
|
|
|
ac->oc[1].m4ac.sample_rate != m4ac.sample_rate ||
|
|
|
|
ac->oc[1].m4ac.chan_config != m4ac.chan_config) {
|
|
|
|
|
|
|
|
if (latmctx->initialized) {
|
|
|
|
av_log(avctx, AV_LOG_INFO, "audio config changed (sample_rate=%d, chan_config=%d)\n", m4ac.sample_rate, m4ac.chan_config);
|
|
|
|
} else {
|
|
|
|
av_log(avctx, AV_LOG_DEBUG, "initializing latmctx\n");
|
|
|
|
}
|
|
|
|
latmctx->initialized = 0;
|
|
|
|
|
|
|
|
esize = (asclen + 7) / 8;
|
|
|
|
|
|
|
|
if (avctx->extradata_size < esize) {
|
|
|
|
av_free(avctx->extradata);
|
|
|
|
avctx->extradata = av_malloc(esize + AV_INPUT_BUFFER_PADDING_SIZE);
|
|
|
|
if (!avctx->extradata)
|
|
|
|
return AVERROR(ENOMEM);
|
|
|
|
}
|
|
|
|
|
|
|
|
avctx->extradata_size = esize;
|
|
|
|
gbc = *gb;
|
|
|
|
for (i = 0; i < esize; i++) {
|
|
|
|
avctx->extradata[i] = get_bits(&gbc, 8);
|
|
|
|
}
|
|
|
|
memset(avctx->extradata+esize, 0, AV_INPUT_BUFFER_PADDING_SIZE);
|
|
|
|
}
|
|
|
|
skip_bits_long(gb, asclen);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int read_stream_mux_config(struct LATMContext *latmctx,
|
|
|
|
GetBitContext *gb)
|
|
|
|
{
|
|
|
|
int ret, audio_mux_version = get_bits(gb, 1);
|
|
|
|
|
|
|
|
latmctx->audio_mux_version_A = 0;
|
|
|
|
if (audio_mux_version)
|
|
|
|
latmctx->audio_mux_version_A = get_bits(gb, 1);
|
|
|
|
|
|
|
|
if (!latmctx->audio_mux_version_A) {
|
|
|
|
|
|
|
|
if (audio_mux_version)
|
|
|
|
latm_get_value(gb); // taraFullness
|
|
|
|
|
|
|
|
skip_bits(gb, 1); // allStreamSameTimeFraming
|
|
|
|
skip_bits(gb, 6); // numSubFrames
|
|
|
|
// numPrograms
|
|
|
|
if (get_bits(gb, 4)) { // numPrograms
|
|
|
|
avpriv_request_sample(latmctx->aac_ctx.avctx, "Multiple programs");
|
|
|
|
return AVERROR_PATCHWELCOME;
|
|
|
|
}
|
|
|
|
|
|
|
|
// for each program (which there is only one in DVB)
|
|
|
|
|
|
|
|
// for each layer (which there is only one in DVB)
|
|
|
|
if (get_bits(gb, 3)) { // numLayer
|
|
|
|
avpriv_request_sample(latmctx->aac_ctx.avctx, "Multiple layers");
|
|
|
|
return AVERROR_PATCHWELCOME;
|
|
|
|
}
|
|
|
|
|
|
|
|
// for all but first stream: use_same_config = get_bits(gb, 1);
|
|
|
|
if (!audio_mux_version) {
|
|
|
|
if ((ret = latm_decode_audio_specific_config(latmctx, gb, 0)) < 0)
|
|
|
|
return ret;
|
|
|
|
} else {
|
|
|
|
int ascLen = latm_get_value(gb);
|
|
|
|
if ((ret = latm_decode_audio_specific_config(latmctx, gb, ascLen)) < 0)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
latmctx->frame_length_type = get_bits(gb, 3);
|
|
|
|
switch (latmctx->frame_length_type) {
|
|
|
|
case 0:
|
|
|
|
skip_bits(gb, 8); // latmBufferFullness
|
|
|
|
break;
|
|
|
|
case 1:
|
|
|
|
latmctx->frame_length = get_bits(gb, 9);
|
|
|
|
break;
|
|
|
|
case 3:
|
|
|
|
case 4:
|
|
|
|
case 5:
|
|
|
|
skip_bits(gb, 6); // CELP frame length table index
|
|
|
|
break;
|
|
|
|
case 6:
|
|
|
|
case 7:
|
|
|
|
skip_bits(gb, 1); // HVXC frame length table index
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (get_bits(gb, 1)) { // other data
|
|
|
|
if (audio_mux_version) {
|
|
|
|
latm_get_value(gb); // other_data_bits
|
|
|
|
} else {
|
|
|
|
int esc;
|
|
|
|
do {
|
|
|
|
if (get_bits_left(gb) < 9)
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
esc = get_bits(gb, 1);
|
|
|
|
skip_bits(gb, 8);
|
|
|
|
} while (esc);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (get_bits(gb, 1)) // crc present
|
|
|
|
skip_bits(gb, 8); // config_crc
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int read_payload_length_info(struct LATMContext *ctx, GetBitContext *gb)
|
|
|
|
{
|
|
|
|
uint8_t tmp;
|
|
|
|
|
|
|
|
if (ctx->frame_length_type == 0) {
|
|
|
|
int mux_slot_length = 0;
|
|
|
|
do {
|
|
|
|
if (get_bits_left(gb) < 8)
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
tmp = get_bits(gb, 8);
|
|
|
|
mux_slot_length += tmp;
|
|
|
|
} while (tmp == 255);
|
|
|
|
return mux_slot_length;
|
|
|
|
} else if (ctx->frame_length_type == 1) {
|
|
|
|
return ctx->frame_length;
|
|
|
|
} else if (ctx->frame_length_type == 3 ||
|
|
|
|
ctx->frame_length_type == 5 ||
|
|
|
|
ctx->frame_length_type == 7) {
|
|
|
|
skip_bits(gb, 2); // mux_slot_length_coded
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int read_audio_mux_element(struct LATMContext *latmctx,
|
|
|
|
GetBitContext *gb)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
uint8_t use_same_mux = get_bits(gb, 1);
|
|
|
|
if (!use_same_mux) {
|
|
|
|
if ((err = read_stream_mux_config(latmctx, gb)) < 0)
|
|
|
|
return err;
|
|
|
|
} else if (!latmctx->aac_ctx.avctx->extradata) {
|
|
|
|
av_log(latmctx->aac_ctx.avctx, AV_LOG_DEBUG,
|
|
|
|
"no decoder config found\n");
|
|
|
|
return 1;
|
|
|
|
}
|
|
|
|
if (latmctx->audio_mux_version_A == 0) {
|
|
|
|
int mux_slot_length_bytes = read_payload_length_info(latmctx, gb);
|
|
|
|
if (mux_slot_length_bytes < 0 || mux_slot_length_bytes * 8LL > get_bits_left(gb)) {
|
|
|
|
av_log(latmctx->aac_ctx.avctx, AV_LOG_ERROR, "incomplete frame\n");
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
} else if (mux_slot_length_bytes * 8 + 256 < get_bits_left(gb)) {
|
|
|
|
av_log(latmctx->aac_ctx.avctx, AV_LOG_ERROR,
|
|
|
|
"frame length mismatch %d << %d\n",
|
|
|
|
mux_slot_length_bytes * 8, get_bits_left(gb));
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static int latm_decode_frame(AVCodecContext *avctx, AVFrame *out,
|
|
|
|
int *got_frame_ptr, AVPacket *avpkt)
|
|
|
|
{
|
|
|
|
struct LATMContext *latmctx = avctx->priv_data;
|
|
|
|
int muxlength, err;
|
|
|
|
GetBitContext gb;
|
|
|
|
|
|
|
|
if ((err = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
// check for LOAS sync word
|
|
|
|
if (get_bits(&gb, 11) != LOAS_SYNC_WORD)
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
|
|
|
|
muxlength = get_bits(&gb, 13) + 3;
|
|
|
|
// not enough data, the parser should have sorted this out
|
|
|
|
if (muxlength > avpkt->size)
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
|
|
|
|
if ((err = read_audio_mux_element(latmctx, &gb)))
|
|
|
|
return (err < 0) ? err : avpkt->size;
|
|
|
|
|
|
|
|
if (!latmctx->initialized) {
|
|
|
|
if (!avctx->extradata) {
|
|
|
|
*got_frame_ptr = 0;
|
|
|
|
return avpkt->size;
|
|
|
|
} else {
|
|
|
|
push_output_configuration(&latmctx->aac_ctx);
|
|
|
|
if ((err = decode_audio_specific_config(
|
|
|
|
&latmctx->aac_ctx, avctx, &latmctx->aac_ctx.oc[1].m4ac,
|
|
|
|
avctx->extradata, avctx->extradata_size*8LL, 1)) < 0) {
|
|
|
|
pop_output_configuration(&latmctx->aac_ctx);
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
latmctx->initialized = 1;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (show_bits(&gb, 12) == 0xfff) {
|
|
|
|
av_log(latmctx->aac_ctx.avctx, AV_LOG_ERROR,
|
|
|
|
"ADTS header detected, probably as result of configuration "
|
|
|
|
"misparsing\n");
|
|
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
}
|
|
|
|
|
|
|
|
switch (latmctx->aac_ctx.oc[1].m4ac.object_type) {
|
|
|
|
case AOT_ER_AAC_LC:
|
|
|
|
case AOT_ER_AAC_LTP:
|
|
|
|
case AOT_ER_AAC_LD:
|
|
|
|
case AOT_ER_AAC_ELD:
|
|
|
|
err = aac_decode_er_frame(avctx, out, got_frame_ptr, &gb);
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
err = aac_decode_frame_int(avctx, out, got_frame_ptr, &gb, avpkt);
|
|
|
|
}
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
|
|
|
|
return muxlength;
|
|
|
|
}
|
|
|
|
|
|
|
|
static av_cold int latm_decode_init(AVCodecContext *avctx)
|
|
|
|
{
|
|
|
|
struct LATMContext *latmctx = avctx->priv_data;
|
2024-05-06 13:28:19 +02:00
|
|
|
int ret = ff_aac_decode_init_float(avctx);
|
2024-03-17 00:34:46 +02:00
|
|
|
|
|
|
|
if (avctx->extradata_size > 0)
|
|
|
|
latmctx->initialized = !ret;
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
Note: This decoder filter is intended to decode LATM streams transferred
|
|
|
|
in MPEG transport streams which only contain one program.
|
|
|
|
To do a more complex LATM demuxing a separate LATM demuxer should be used.
|
|
|
|
*/
|
|
|
|
const FFCodec ff_aac_latm_decoder = {
|
|
|
|
.p.name = "aac_latm",
|
|
|
|
CODEC_LONG_NAME("AAC LATM (Advanced Audio Coding LATM syntax)"),
|
|
|
|
.p.type = AVMEDIA_TYPE_AUDIO,
|
|
|
|
.p.id = AV_CODEC_ID_AAC_LATM,
|
|
|
|
.priv_data_size = sizeof(struct LATMContext),
|
|
|
|
.init = latm_decode_init,
|
2024-03-21 09:20:43 +02:00
|
|
|
.close = decode_close,
|
2024-03-17 00:34:46 +02:00
|
|
|
FF_CODEC_DECODE_CB(latm_decode_frame),
|
|
|
|
.p.sample_fmts = (const enum AVSampleFormat[]) {
|
|
|
|
AV_SAMPLE_FMT_FLTP, AV_SAMPLE_FMT_NONE
|
|
|
|
},
|
|
|
|
.p.capabilities = AV_CODEC_CAP_CHANNEL_CONF | AV_CODEC_CAP_DR1,
|
|
|
|
.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
|
|
|
|
.p.ch_layouts = ff_aac_ch_layout,
|
|
|
|
.flush = flush,
|
|
|
|
.p.profiles = NULL_IF_CONFIG_SMALL(ff_aac_profiles),
|
|
|
|
};
|
|
|
|
|
|
|
|
#endif /* AVCODEC_AAC_AACDEC_LATM_H */
|