242 lines
7.6 KiB
C
242 lines
7.6 KiB
C
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/*
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* ADTS muxer.
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* Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com>
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* Mans Rullgard <mans@mansr.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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#include "libavcodec/get_bits.h"
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#include "libavcodec/put_bits.h"
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#include "libavcodec/avcodec.h"
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#include "libavcodec/mpeg4audio.h"
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#include "libavutil/opt.h"
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#include "avformat.h"
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#include "apetag.h"
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#include "id3v2.h"
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#define ADTS_HEADER_SIZE 7
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typedef struct ADTSContext {
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AVClass *class;
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int write_adts;
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int objecttype;
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int sample_rate_index;
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int channel_conf;
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int pce_size;
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int apetag;
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int id3v2tag;
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uint8_t pce_data[MAX_PCE_SIZE];
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} ADTSContext;
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#define ADTS_MAX_FRAME_BYTES ((1 << 13) - 1)
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static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const uint8_t *buf, int size)
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{
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GetBitContext gb;
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PutBitContext pb;
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MPEG4AudioConfig m4ac;
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int off;
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init_get_bits(&gb, buf, size * 8);
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off = avpriv_mpeg4audio_get_config2(&m4ac, buf, size, 1, s);
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if (off < 0)
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return off;
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skip_bits_long(&gb, off);
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adts->objecttype = m4ac.object_type - 1;
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adts->sample_rate_index = m4ac.sampling_index;
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adts->channel_conf = m4ac.chan_config;
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if (adts->objecttype > 3U) {
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av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1);
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return AVERROR_INVALIDDATA;
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}
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if (adts->sample_rate_index == 15) {
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av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n");
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return AVERROR_INVALIDDATA;
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}
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if (get_bits(&gb, 1)) {
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av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n");
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return AVERROR_INVALIDDATA;
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}
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if (get_bits(&gb, 1)) {
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av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n");
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return AVERROR_INVALIDDATA;
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}
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if (get_bits(&gb, 1)) {
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av_log(s, AV_LOG_ERROR, "Extension flag is not allowed in ADTS\n");
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return AVERROR_INVALIDDATA;
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}
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if (!adts->channel_conf) {
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init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE);
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put_bits(&pb, 3, 5); //ID_PCE
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adts->pce_size = (ff_copy_pce_data(&pb, &gb) + 3) / 8;
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flush_put_bits(&pb);
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}
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adts->write_adts = 1;
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return 0;
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}
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static int adts_init(AVFormatContext *s)
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{
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ADTSContext *adts = s->priv_data;
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AVCodecParameters *par = s->streams[0]->codecpar;
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if (par->codec_id != AV_CODEC_ID_AAC) {
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av_log(s, AV_LOG_ERROR, "Only AAC streams can be muxed by the ADTS muxer\n");
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return AVERROR(EINVAL);
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}
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if (par->extradata_size > 0)
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return adts_decode_extradata(s, adts, par->extradata,
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par->extradata_size);
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return 0;
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}
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static int adts_write_header(AVFormatContext *s)
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{
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ADTSContext *adts = s->priv_data;
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if (adts->id3v2tag)
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ff_id3v2_write_simple(s, 4, ID3v2_DEFAULT_MAGIC);
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return 0;
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}
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static int adts_write_frame_header(ADTSContext *ctx,
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uint8_t *buf, int size, int pce_size)
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{
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PutBitContext pb;
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unsigned full_frame_size = (unsigned)ADTS_HEADER_SIZE + size + pce_size;
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if (full_frame_size > ADTS_MAX_FRAME_BYTES) {
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av_log(NULL, AV_LOG_ERROR, "ADTS frame size too large: %u (max %d)\n",
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full_frame_size, ADTS_MAX_FRAME_BYTES);
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return AVERROR_INVALIDDATA;
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}
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init_put_bits(&pb, buf, ADTS_HEADER_SIZE);
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/* adts_fixed_header */
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put_bits(&pb, 12, 0xfff); /* syncword */
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put_bits(&pb, 1, 0); /* ID */
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put_bits(&pb, 2, 0); /* layer */
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put_bits(&pb, 1, 1); /* protection_absent */
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put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */
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put_bits(&pb, 4, ctx->sample_rate_index);
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put_bits(&pb, 1, 0); /* private_bit */
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put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */
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put_bits(&pb, 1, 0); /* original_copy */
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put_bits(&pb, 1, 0); /* home */
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/* adts_variable_header */
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put_bits(&pb, 1, 0); /* copyright_identification_bit */
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put_bits(&pb, 1, 0); /* copyright_identification_start */
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put_bits(&pb, 13, full_frame_size); /* aac_frame_length */
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put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */
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put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */
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flush_put_bits(&pb);
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return 0;
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}
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static int adts_write_packet(AVFormatContext *s, AVPacket *pkt)
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{
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ADTSContext *adts = s->priv_data;
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AVCodecParameters *par = s->streams[0]->codecpar;
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AVIOContext *pb = s->pb;
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uint8_t buf[ADTS_HEADER_SIZE];
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if (!pkt->size)
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return 0;
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if (!par->extradata_size) {
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uint8_t *side_data;
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int side_data_size = 0, ret;
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side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA,
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&side_data_size);
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if (side_data_size) {
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ret = adts_decode_extradata(s, adts, side_data, side_data_size);
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if (ret < 0)
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return ret;
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ret = ff_alloc_extradata(par, side_data_size);
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if (ret < 0)
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return ret;
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memcpy(par->extradata, side_data, side_data_size);
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}
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}
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if (adts->write_adts) {
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int err = adts_write_frame_header(adts, buf, pkt->size,
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adts->pce_size);
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if (err < 0)
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return err;
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avio_write(pb, buf, ADTS_HEADER_SIZE);
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if (adts->pce_size) {
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avio_write(pb, adts->pce_data, adts->pce_size);
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adts->pce_size = 0;
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}
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}
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avio_write(pb, pkt->data, pkt->size);
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return 0;
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}
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static int adts_write_trailer(AVFormatContext *s)
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{
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ADTSContext *adts = s->priv_data;
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if (adts->apetag)
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ff_ape_write_tag(s);
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return 0;
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}
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#define ENC AV_OPT_FLAG_ENCODING_PARAM
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#define OFFSET(obj) offsetof(ADTSContext, obj)
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static const AVOption options[] = {
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{ "write_id3v2", "Enable ID3v2 tag writing", OFFSET(id3v2tag), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
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{ "write_apetag", "Enable APE tag writing", OFFSET(apetag), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC},
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{ NULL },
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};
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static const AVClass adts_muxer_class = {
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.class_name = "ADTS muxer",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVOutputFormat ff_adts_muxer = {
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.name = "adts",
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.long_name = NULL_IF_CONFIG_SMALL("ADTS AAC (Advanced Audio Coding)"),
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.mime_type = "audio/aac",
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.extensions = "aac,adts",
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.priv_data_size = sizeof(ADTSContext),
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.audio_codec = AV_CODEC_ID_AAC,
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.video_codec = AV_CODEC_ID_NONE,
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.init = adts_init,
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.write_header = adts_write_header,
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.write_packet = adts_write_packet,
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.write_trailer = adts_write_trailer,
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.priv_class = &adts_muxer_class,
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.flags = AVFMT_NOTIMESTAMPS,
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};
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