2007-05-08 23:25:31 +00:00
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/*
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2008-08-03 16:42:32 +00:00
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* Common AAC and AC-3 parser
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2009-01-19 15:46:40 +00:00
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* Copyright (c) 2003 Fabrice Bellard
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* Copyright (c) 2003 Michael Niedermayer
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2007-05-08 23:25:31 +00:00
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*
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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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* 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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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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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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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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2022-02-23 12:56:49 +00:00
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#include "config_components.h"
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2013-11-22 16:25:48 +00:00
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#include "libavutil/channel_layout.h"
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2012-08-06 13:49:32 +00:00
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#include "libavutil/common.h"
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2007-05-08 23:25:31 +00:00
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#include "parser.h"
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#include "aac_ac3_parser.h"
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2022-10-22 19:30:52 +00:00
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#include "ac3_parser_internal.h"
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#include "adts_header.h"
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2007-05-08 23:25:31 +00:00
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2007-05-08 23:29:07 +00:00
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int ff_aac_ac3_parse(AVCodecParserContext *s1,
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2007-05-08 23:25:31 +00:00
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AVCodecContext *avctx,
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const uint8_t **poutbuf, int *poutbuf_size,
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const uint8_t *buf, int buf_size)
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{
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2007-05-08 23:29:07 +00:00
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AACAC3ParseContext *s = s1->priv_data;
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2008-04-19 01:50:40 +00:00
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ParseContext *pc = &s->pc;
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int len, i;
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2008-04-19 01:59:55 +00:00
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int new_frame_start;
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2015-11-24 09:20:09 +00:00
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int got_frame = 0;
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2007-05-08 23:25:31 +00:00
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2022-10-22 19:37:01 +00:00
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if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) {
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i = buf_size;
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got_frame = 1;
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} else {
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2008-04-19 02:28:24 +00:00
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get_next:
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2022-10-22 19:57:14 +00:00
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i=END_NOT_FOUND;
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if(s->remaining_size <= buf_size){
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if(s->remaining_size && !s->need_next_header){
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i= s->remaining_size;
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s->remaining_size = 0;
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}else{ //we need a header first
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len=0;
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for(i=s->remaining_size; i<buf_size; i++){
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s->state = (s->state<<8) + buf[i];
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if((len=s->sync(s->state, &s->need_next_header, &new_frame_start)))
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break;
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2008-04-19 11:14:55 +00:00
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}
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2022-10-22 19:57:14 +00:00
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if(len<=0){
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i=END_NOT_FOUND;
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}else{
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got_frame = 1;
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s->state=0;
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i-= s->header_size -1;
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s->remaining_size = len;
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if(!new_frame_start || pc->index+i<=0){
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s->remaining_size += i;
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goto get_next;
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}
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else if (i < 0) {
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s->remaining_size += i;
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}
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2018-04-05 15:09:35 +00:00
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}
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2008-04-19 01:50:40 +00:00
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}
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}
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2007-05-08 23:25:31 +00:00
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2022-10-22 19:57:14 +00:00
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if(ff_combine_frame(pc, i, &buf, &buf_size)<0){
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s->remaining_size -= FFMIN(s->remaining_size, buf_size);
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*poutbuf = NULL;
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*poutbuf_size = 0;
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return buf_size;
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}
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2022-10-22 19:37:01 +00:00
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}
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2008-04-09 22:11:21 +00:00
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2008-04-19 01:50:40 +00:00
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*poutbuf = buf;
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*poutbuf_size = buf_size;
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2007-10-13 09:58:39 +00:00
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2015-11-24 09:20:09 +00:00
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if (got_frame) {
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2022-10-22 19:30:52 +00:00
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int bit_rate;
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2015-11-25 20:53:06 +00:00
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/* Due to backwards compatible HE-AAC the sample rate, channel count,
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and total number of samples found in an AAC ADTS header are not
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reliable. Bit rate is still accurate because the total frame
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duration in seconds is still correct (as is the number of bits in
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the frame). */
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if (avctx->codec_id != AV_CODEC_ID_AAC) {
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2023-06-24 17:37:10 +00:00
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#if CONFIG_AC3_PARSER
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2022-10-22 19:30:52 +00:00
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AC3HeaderInfo hdr, *phrd = &hdr;
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int offset = ff_ac3_find_syncword(buf, buf_size);
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if (offset < 0)
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return i;
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buf += offset;
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buf_size -= offset;
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while (buf_size > 0) {
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int ret = avpriv_ac3_parse_header(&phrd, buf, buf_size);
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if (ret < 0 || hdr.frame_size > buf_size)
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return i;
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if (buf_size > hdr.frame_size) {
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buf += hdr.frame_size;
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buf_size -= hdr.frame_size;
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continue;
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}
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2022-10-22 19:41:41 +00:00
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/* Check for false positives since the syncword is not enough.
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See section 6.1.2 of A/52. */
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if (av_crc(s->crc_ctx, 0, buf + 2, hdr.frame_size - 2))
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return i;
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2022-10-22 19:30:52 +00:00
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break;
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}
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avctx->sample_rate = hdr.sample_rate;
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if (hdr.bitstream_id > 10)
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avctx->codec_id = AV_CODEC_ID_EAC3;
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2021-01-25 11:04:36 +00:00
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if (!CONFIG_EAC3_DECODER || avctx->codec_id != AV_CODEC_ID_EAC3) {
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2013-05-07 05:20:32 +00:00
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av_channel_layout_uninit(&avctx->ch_layout);
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2022-10-22 19:30:52 +00:00
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if (hdr.channel_layout) {
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av_channel_layout_from_mask(&avctx->ch_layout, hdr.channel_layout);
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2013-05-07 05:20:32 +00:00
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} else {
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avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
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2022-10-22 19:30:52 +00:00
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avctx->ch_layout.nb_channels = hdr.channels;
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2013-05-07 05:20:32 +00:00
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}
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2018-03-26 11:47:29 +00:00
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}
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2022-10-22 19:30:52 +00:00
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s1->duration = hdr.num_blocks * 256;
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avctx->audio_service_type = hdr.bitstream_mode;
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if (hdr.bitstream_mode == 0x7 && hdr.channels > 1)
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avctx->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
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bit_rate = hdr.bit_rate;
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2023-06-24 17:37:10 +00:00
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#endif
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2022-10-22 19:30:52 +00:00
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} else {
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2023-06-24 17:37:10 +00:00
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#if CONFIG_AAC_PARSER
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2024-05-09 14:30:11 +00:00
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AACADTSHeaderInfo hdr;
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if (buf_size < AV_AAC_ADTS_HEADER_SIZE ||
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ff_adts_header_parse_buf(buf, &hdr) < 0)
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2022-10-22 19:30:52 +00:00
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return i;
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bit_rate = hdr.bit_rate;
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2023-06-24 17:37:10 +00:00
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#endif
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2010-03-04 02:32:48 +00:00
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}
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2010-03-04 02:30:51 +00:00
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2020-05-17 04:10:05 +00:00
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/* Calculate the average bit rate */
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s->frame_number++;
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2021-01-25 11:04:36 +00:00
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if (!CONFIG_EAC3_DECODER || avctx->codec_id != AV_CODEC_ID_EAC3) {
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2020-07-17 18:51:43 +00:00
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avctx->bit_rate +=
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2022-10-22 19:30:52 +00:00
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(bit_rate - avctx->bit_rate) / s->frame_number;
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2020-05-17 04:10:05 +00:00
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}
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2015-11-24 09:20:09 +00:00
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}
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2008-04-19 01:50:40 +00:00
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return i;
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2007-05-08 23:25:31 +00:00
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}
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