2009-06-03 21:50:46 +03:00
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/*
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* MPEG-2/4 AAC ADTS to MPEG-4 Audio Specific Configuration bitstream filter
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* Copyright (c) 2009 Alex Converse <alex.converse@gmail.com>
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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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2024-04-10 15:17:54 +02:00
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#include "adts_header.h"
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#include "adts_parser.h"
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#include "bsf.h"
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#include "bsf_internal.h"
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#include "put_bits.h"
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#include "get_bits.h"
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#include "mpeg4audio.h"
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#include "mpeg4audio_copy_pce.h"
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2009-06-03 21:50:46 +03:00
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typedef struct AACBSFContext {
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int first_frame_done;
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} AACBSFContext;
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/**
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* This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4
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* ADTS header and removes the ADTS header.
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*/
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2018-03-17 01:06:40 +02:00
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static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *pkt)
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2009-06-03 21:50:46 +03:00
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{
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2013-11-23 13:43:13 +03:00
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AACBSFContext *ctx = bsfc->priv_data;
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2009-06-03 21:50:46 +03:00
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PutBitContext pb;
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AACADTSHeaderInfo hdr;
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2013-11-23 13:43:13 +03:00
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int ret;
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2009-06-03 21:50:46 +03:00
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2018-03-17 01:06:40 +02:00
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ret = ff_bsf_get_packet_ref(bsfc, pkt);
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2013-11-23 13:43:13 +03:00
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if (ret < 0)
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return ret;
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2009-06-03 21:50:46 +03:00
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2018-03-17 01:06:40 +02:00
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if (bsfc->par_in->extradata && pkt->size >= 2 && (AV_RB16(pkt->data) >> 4) != 0xfff)
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return 0;
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2017-04-11 06:03:51 +02:00
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2018-03-17 01:06:40 +02:00
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if (pkt->size < AV_AAC_ADTS_HEADER_SIZE)
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2013-11-23 13:43:13 +03:00
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goto packet_too_small;
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2009-06-03 21:50:46 +03:00
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2024-05-09 16:09:53 +02:00
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if (ff_adts_header_parse_buf(pkt->data, &hdr) < 0) {
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2013-11-23 13:43:13 +03:00
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av_log(bsfc, AV_LOG_ERROR, "Error parsing ADTS frame header!\n");
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ret = AVERROR_INVALIDDATA;
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goto fail;
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2009-06-03 21:50:46 +03:00
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}
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if (!hdr.crc_absent && hdr.num_aac_frames > 1) {
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2013-11-23 13:43:13 +03:00
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avpriv_report_missing_feature(bsfc,
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2013-02-26 01:53:52 +03:00
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"Multiple RDBs per frame with CRC");
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2013-11-23 13:43:13 +03:00
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ret = AVERROR_PATCHWELCOME;
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goto fail;
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2009-06-03 21:50:46 +03:00
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}
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2018-03-17 01:06:40 +02:00
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pkt->size -= AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
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if (pkt->size <= 0)
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2013-11-23 13:43:13 +03:00
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goto packet_too_small;
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2018-03-17 01:06:40 +02:00
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pkt->data += AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
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2009-06-03 21:50:46 +03:00
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if (!ctx->first_frame_done) {
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int pce_size = 0;
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uint8_t pce_data[MAX_PCE_SIZE];
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2013-11-23 13:43:13 +03:00
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uint8_t *extradata;
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2009-06-03 21:50:46 +03:00
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if (!hdr.chan_config) {
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2024-05-09 16:09:53 +02:00
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GetBitContext gb;
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2018-03-17 01:06:40 +02:00
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init_get_bits(&gb, pkt->data, pkt->size * 8);
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2009-06-03 21:50:46 +03:00
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if (get_bits(&gb, 3) != 5) {
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2013-11-23 13:43:13 +03:00
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avpriv_report_missing_feature(bsfc,
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2013-02-26 01:53:52 +03:00
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"PCE-based channel configuration "
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"without PCE as first syntax "
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"element");
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2013-11-23 13:43:13 +03:00
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ret = AVERROR_PATCHWELCOME;
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goto fail;
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2009-06-03 21:50:46 +03:00
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}
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init_put_bits(&pb, pce_data, MAX_PCE_SIZE);
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2017-03-16 18:34:12 +02:00
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pce_size = ff_copy_pce_data(&pb, &gb) / 8;
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2009-06-03 21:50:46 +03:00
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flush_put_bits(&pb);
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2018-03-17 01:06:40 +02:00
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pkt->size -= get_bits_count(&gb)/8;
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pkt->data += get_bits_count(&gb)/8;
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2009-06-03 21:50:46 +03:00
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}
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2018-03-17 01:06:40 +02:00
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extradata = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
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2017-04-10 18:36:19 +02:00
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2 + pce_size);
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2013-11-23 13:43:13 +03:00
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if (!extradata) {
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ret = AVERROR(ENOMEM);
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goto fail;
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2015-02-17 23:58:31 +02:00
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}
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2009-06-03 21:50:46 +03:00
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2013-11-23 13:43:13 +03:00
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init_put_bits(&pb, extradata, 2 + pce_size);
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2009-06-03 21:50:46 +03:00
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put_bits(&pb, 5, hdr.object_type);
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put_bits(&pb, 4, hdr.sampling_index);
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put_bits(&pb, 4, hdr.chan_config);
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put_bits(&pb, 1, 0); //frame length - 1024 samples
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put_bits(&pb, 1, 0); //does not depend on core coder
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put_bits(&pb, 1, 0); //is not extension
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flush_put_bits(&pb);
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if (pce_size) {
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2013-11-23 13:43:13 +03:00
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memcpy(extradata + 2, pce_data, pce_size);
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2009-06-03 21:50:46 +03:00
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}
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ctx->first_frame_done = 1;
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}
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return 0;
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2013-11-23 13:43:13 +03:00
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packet_too_small:
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av_log(bsfc, AV_LOG_ERROR, "Input packet too small\n");
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ret = AVERROR_INVALIDDATA;
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fail:
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2018-03-17 01:06:40 +02:00
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av_packet_unref(pkt);
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2013-11-23 13:43:13 +03:00
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return ret;
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2009-06-03 21:50:46 +03:00
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}
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2013-11-23 13:43:13 +03:00
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static int aac_adtstoasc_init(AVBSFContext *ctx)
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{
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2016-11-25 02:10:47 +02:00
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/* Validate the extradata if the stream is already MPEG-4 AudioSpecificConfig */
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if (ctx->par_in->extradata) {
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MPEG4AudioConfig mp4ac;
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2019-09-22 01:04:33 +02:00
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int ret = avpriv_mpeg4audio_get_config2(&mp4ac, ctx->par_in->extradata,
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ctx->par_in->extradata_size, 1, ctx);
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2016-11-25 02:10:47 +02:00
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if (ret < 0) {
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av_log(ctx, AV_LOG_ERROR, "Error parsing AudioSpecificConfig extradata!\n");
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return ret;
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}
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}
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2009-06-03 21:50:46 +03:00
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return 0;
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}
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2013-11-23 13:43:13 +03:00
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static const enum AVCodecID codec_ids[] = {
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AV_CODEC_ID_AAC, AV_CODEC_ID_NONE,
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};
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2022-03-21 23:25:27 +02:00
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const FFBitStreamFilter ff_aac_adtstoasc_bsf = {
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.p.name = "aac_adtstoasc",
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.p.codec_ids = codec_ids,
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2013-10-02 20:20:29 +03:00
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.priv_data_size = sizeof(AACBSFContext),
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2013-11-23 13:43:13 +03:00
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.init = aac_adtstoasc_init,
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2013-10-02 20:20:29 +03:00
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.filter = aac_adtstoasc_filter,
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2009-06-03 21:50:46 +03:00
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};
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