155 lines
4.6 KiB
C
155 lines
4.6 KiB
C
/*
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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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#include "avcodec.h"
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#include "aacadtsdec.h"
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#include "bsf.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 "internal.h"
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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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static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *out)
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{
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AACBSFContext *ctx = bsfc->priv_data;
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GetBitContext gb;
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PutBitContext pb;
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AACADTSHeaderInfo hdr;
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AVPacket *in;
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int ret;
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ret = ff_bsf_get_packet(bsfc, &in);
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if (ret < 0)
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return ret;
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if (in->size < AAC_ADTS_HEADER_SIZE)
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goto packet_too_small;
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init_get_bits(&gb, in->data, AAC_ADTS_HEADER_SIZE * 8);
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if (bsfc->par_in->extradata && show_bits(&gb, 12) != 0xfff)
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goto finish;
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if (avpriv_aac_parse_header(&gb, &hdr) < 0) {
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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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}
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if (!hdr.crc_absent && hdr.num_aac_frames > 1) {
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avpriv_report_missing_feature(bsfc,
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"Multiple RDBs per frame with CRC");
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ret = AVERROR_PATCHWELCOME;
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goto fail;
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}
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in->size -= AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
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if (in->size <= 0)
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goto packet_too_small;
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in->data += AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent;
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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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uint8_t *extradata;
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if (!hdr.chan_config) {
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init_get_bits(&gb, in->data, in->size * 8);
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if (get_bits(&gb, 3) != 5) {
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avpriv_report_missing_feature(bsfc,
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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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ret = AVERROR_PATCHWELCOME;
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goto fail;
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}
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init_put_bits(&pb, pce_data, MAX_PCE_SIZE);
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pce_size = avpriv_copy_pce_data(&pb, &gb)/8;
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flush_put_bits(&pb);
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in->size -= get_bits_count(&gb)/8;
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in->data += get_bits_count(&gb)/8;
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}
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extradata = av_packet_new_side_data(in, AV_PKT_DATA_NEW_EXTRADATA,
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2 + pce_size);
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if (!extradata) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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init_put_bits(&pb, extradata, 2 + pce_size);
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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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memcpy(extradata + 2, pce_data, pce_size);
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}
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ctx->first_frame_done = 1;
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}
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finish:
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av_packet_move_ref(out, in);
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av_packet_free(&in);
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return 0;
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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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av_packet_free(&in);
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return ret;
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}
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static int aac_adtstoasc_init(AVBSFContext *ctx)
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{
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av_freep(&ctx->par_out->extradata);
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ctx->par_out->extradata_size = 0;
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return 0;
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}
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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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const AVBitStreamFilter ff_aac_adtstoasc_bsf = {
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.name = "aac_adtstoasc",
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.priv_data_size = sizeof(AACBSFContext),
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.init = aac_adtstoasc_init,
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.filter = aac_adtstoasc_filter,
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.codec_ids = codec_ids,
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};
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