mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-23 19:30:05 +00:00
120 lines
4.1 KiB
C
120 lines
4.1 KiB
C
/*
|
|
* MPEG-2/4 AAC ADTS to MPEG-4 Audio Specific Configuration bitstream filter
|
|
* Copyright (c) 2009 Alex Converse <alex.converse@gmail.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 "avcodec.h"
|
|
#include "aacadtsdec.h"
|
|
#include "put_bits.h"
|
|
#include "get_bits.h"
|
|
#include "mpeg4audio.h"
|
|
#include "internal.h"
|
|
|
|
typedef struct AACBSFContext {
|
|
int first_frame_done;
|
|
} AACBSFContext;
|
|
|
|
/**
|
|
* This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4
|
|
* ADTS header and removes the ADTS header.
|
|
*/
|
|
static int aac_adtstoasc_filter(AVBitStreamFilterContext *bsfc,
|
|
AVCodecContext *avctx, const char *args,
|
|
uint8_t **poutbuf, int *poutbuf_size,
|
|
const uint8_t *buf, int buf_size,
|
|
int keyframe)
|
|
{
|
|
GetBitContext gb;
|
|
PutBitContext pb;
|
|
AACADTSHeaderInfo hdr;
|
|
|
|
AACBSFContext *ctx = bsfc->priv_data;
|
|
|
|
init_get_bits(&gb, buf, AAC_ADTS_HEADER_SIZE*8);
|
|
|
|
*poutbuf = (uint8_t*) buf;
|
|
*poutbuf_size = buf_size;
|
|
|
|
if (avctx->extradata)
|
|
if (show_bits(&gb, 12) != 0xfff)
|
|
return 0;
|
|
|
|
if (avpriv_aac_parse_header(&gb, &hdr) < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Error parsing ADTS frame header!\n");
|
|
return -1;
|
|
}
|
|
|
|
if (!hdr.crc_absent && hdr.num_aac_frames > 1) {
|
|
avpriv_report_missing_feature(avctx,
|
|
"Multiple RDBs per frame with CRC");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
|
|
buf += AAC_ADTS_HEADER_SIZE + 2*!hdr.crc_absent;
|
|
buf_size -= AAC_ADTS_HEADER_SIZE + 2*!hdr.crc_absent;
|
|
|
|
if (!ctx->first_frame_done) {
|
|
int pce_size = 0;
|
|
uint8_t pce_data[MAX_PCE_SIZE];
|
|
if (!hdr.chan_config) {
|
|
init_get_bits(&gb, buf, buf_size * 8);
|
|
if (get_bits(&gb, 3) != 5) {
|
|
avpriv_report_missing_feature(avctx,
|
|
"PCE-based channel configuration "
|
|
"without PCE as first syntax "
|
|
"element");
|
|
return AVERROR_PATCHWELCOME;
|
|
}
|
|
init_put_bits(&pb, pce_data, MAX_PCE_SIZE);
|
|
pce_size = avpriv_copy_pce_data(&pb, &gb)/8;
|
|
flush_put_bits(&pb);
|
|
buf_size -= get_bits_count(&gb)/8;
|
|
buf += get_bits_count(&gb)/8;
|
|
}
|
|
av_free(avctx->extradata);
|
|
avctx->extradata_size = 2 + pce_size;
|
|
avctx->extradata = av_mallocz(avctx->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
|
|
init_put_bits(&pb, avctx->extradata, avctx->extradata_size);
|
|
put_bits(&pb, 5, hdr.object_type);
|
|
put_bits(&pb, 4, hdr.sampling_index);
|
|
put_bits(&pb, 4, hdr.chan_config);
|
|
put_bits(&pb, 1, 0); //frame length - 1024 samples
|
|
put_bits(&pb, 1, 0); //does not depend on core coder
|
|
put_bits(&pb, 1, 0); //is not extension
|
|
flush_put_bits(&pb);
|
|
if (pce_size) {
|
|
memcpy(avctx->extradata + 2, pce_data, pce_size);
|
|
}
|
|
|
|
ctx->first_frame_done = 1;
|
|
}
|
|
|
|
*poutbuf = (uint8_t*) buf;
|
|
*poutbuf_size = buf_size;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVBitStreamFilter ff_aac_adtstoasc_bsf = {
|
|
.name = "aac_adtstoasc",
|
|
.priv_data_size = sizeof(AACBSFContext),
|
|
.filter = aac_adtstoasc_filter,
|
|
};
|