| /* |
| * ADTS muxer. |
| * Copyright (c) 2006 Baptiste Coudurier <baptiste.coudurier@smartjog.com> |
| * Mans Rullgard <mans@mansr.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 "libavcodec/get_bits.h" |
| #include "libavcodec/put_bits.h" |
| #include "libavcodec/avcodec.h" |
| #include "libavcodec/mpeg4audio.h" |
| #include "libavutil/opt.h" |
| #include "avformat.h" |
| #include "apetag.h" |
| #include "id3v2.h" |
| |
| #define ADTS_HEADER_SIZE 7 |
| |
| typedef struct ADTSContext { |
| AVClass *class; |
| int write_adts; |
| int objecttype; |
| int sample_rate_index; |
| int channel_conf; |
| int pce_size; |
| int apetag; |
| int id3v2tag; |
| int mpeg_id; |
| uint8_t pce_data[MAX_PCE_SIZE]; |
| } ADTSContext; |
| |
| #define ADTS_MAX_FRAME_BYTES ((1 << 13) - 1) |
| |
| static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const uint8_t *buf, int size) |
| { |
| GetBitContext gb; |
| PutBitContext pb; |
| MPEG4AudioConfig m4ac; |
| int off; |
| |
| init_get_bits(&gb, buf, size * 8); |
| off = avpriv_mpeg4audio_get_config2(&m4ac, buf, size, 1, s); |
| if (off < 0) |
| return off; |
| skip_bits_long(&gb, off); |
| adts->objecttype = m4ac.object_type - 1; |
| adts->sample_rate_index = m4ac.sampling_index; |
| adts->channel_conf = m4ac.chan_config; |
| |
| if (adts->objecttype > 3U) { |
| av_log(s, AV_LOG_ERROR, "MPEG-4 AOT %d is not allowed in ADTS\n", adts->objecttype+1); |
| return AVERROR_INVALIDDATA; |
| } |
| if (adts->sample_rate_index == 15) { |
| av_log(s, AV_LOG_ERROR, "Escape sample rate index illegal in ADTS\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (get_bits(&gb, 1)) { |
| av_log(s, AV_LOG_ERROR, "960/120 MDCT window is not allowed in ADTS\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (get_bits(&gb, 1)) { |
| av_log(s, AV_LOG_ERROR, "Scalable configurations are not allowed in ADTS\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (get_bits(&gb, 1)) { |
| av_log(s, AV_LOG_ERROR, "Extension flag is not allowed in ADTS\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| if (!adts->channel_conf) { |
| init_put_bits(&pb, adts->pce_data, MAX_PCE_SIZE); |
| |
| put_bits(&pb, 3, 5); //ID_PCE |
| adts->pce_size = (ff_copy_pce_data(&pb, &gb) + 3) / 8; |
| flush_put_bits(&pb); |
| } |
| |
| adts->write_adts = 1; |
| |
| return 0; |
| } |
| |
| static int adts_init(AVFormatContext *s) |
| { |
| ADTSContext *adts = s->priv_data; |
| AVCodecParameters *par = s->streams[0]->codecpar; |
| |
| if (par->codec_id != AV_CODEC_ID_AAC) { |
| av_log(s, AV_LOG_ERROR, "Only AAC streams can be muxed by the ADTS muxer\n"); |
| return AVERROR(EINVAL); |
| } |
| if (par->extradata_size > 0) |
| return adts_decode_extradata(s, adts, par->extradata, |
| par->extradata_size); |
| |
| return 0; |
| } |
| |
| static int adts_write_header(AVFormatContext *s) |
| { |
| ADTSContext *adts = s->priv_data; |
| |
| if (adts->id3v2tag) |
| ff_id3v2_write_simple(s, 4, ID3v2_DEFAULT_MAGIC); |
| |
| return 0; |
| } |
| |
| static int adts_write_frame_header(ADTSContext *ctx, |
| uint8_t *buf, int size, int pce_size) |
| { |
| PutBitContext pb; |
| |
| unsigned full_frame_size = (unsigned)ADTS_HEADER_SIZE + size + pce_size; |
| if (full_frame_size > ADTS_MAX_FRAME_BYTES) { |
| av_log(NULL, AV_LOG_ERROR, "ADTS frame size too large: %u (max %d)\n", |
| full_frame_size, ADTS_MAX_FRAME_BYTES); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| init_put_bits(&pb, buf, ADTS_HEADER_SIZE); |
| |
| /* adts_fixed_header */ |
| put_bits(&pb, 12, 0xfff); /* syncword */ |
| put_bits(&pb, 1, ctx->mpeg_id); /* ID */ |
| put_bits(&pb, 2, 0); /* layer */ |
| put_bits(&pb, 1, 1); /* protection_absent */ |
| put_bits(&pb, 2, ctx->objecttype); /* profile_objecttype */ |
| put_bits(&pb, 4, ctx->sample_rate_index); |
| put_bits(&pb, 1, 0); /* private_bit */ |
| put_bits(&pb, 3, ctx->channel_conf); /* channel_configuration */ |
| put_bits(&pb, 1, 0); /* original_copy */ |
| put_bits(&pb, 1, 0); /* home */ |
| |
| /* adts_variable_header */ |
| put_bits(&pb, 1, 0); /* copyright_identification_bit */ |
| put_bits(&pb, 1, 0); /* copyright_identification_start */ |
| put_bits(&pb, 13, full_frame_size); /* aac_frame_length */ |
| put_bits(&pb, 11, 0x7ff); /* adts_buffer_fullness */ |
| put_bits(&pb, 2, 0); /* number_of_raw_data_blocks_in_frame */ |
| |
| flush_put_bits(&pb); |
| |
| return 0; |
| } |
| |
| static int adts_write_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| ADTSContext *adts = s->priv_data; |
| AVCodecParameters *par = s->streams[0]->codecpar; |
| AVIOContext *pb = s->pb; |
| uint8_t buf[ADTS_HEADER_SIZE]; |
| |
| if (!pkt->size) |
| return 0; |
| if (!par->extradata_size) { |
| uint8_t *side_data; |
| int side_data_size, ret; |
| |
| side_data = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, |
| &side_data_size); |
| if (side_data_size) { |
| ret = adts_decode_extradata(s, adts, side_data, side_data_size); |
| if (ret < 0) |
| return ret; |
| ret = ff_alloc_extradata(par, side_data_size); |
| if (ret < 0) |
| return ret; |
| memcpy(par->extradata, side_data, side_data_size); |
| } |
| } |
| if (adts->write_adts) { |
| int err = adts_write_frame_header(adts, buf, pkt->size, |
| adts->pce_size); |
| if (err < 0) |
| return err; |
| avio_write(pb, buf, ADTS_HEADER_SIZE); |
| if (adts->pce_size) { |
| avio_write(pb, adts->pce_data, adts->pce_size); |
| adts->pce_size = 0; |
| } |
| } |
| avio_write(pb, pkt->data, pkt->size); |
| |
| return 0; |
| } |
| |
| static int adts_write_trailer(AVFormatContext *s) |
| { |
| ADTSContext *adts = s->priv_data; |
| |
| if (adts->apetag) |
| ff_ape_write_tag(s); |
| |
| return 0; |
| } |
| |
| #define ENC AV_OPT_FLAG_ENCODING_PARAM |
| #define OFFSET(obj) offsetof(ADTSContext, obj) |
| static const AVOption options[] = { |
| { "write_id3v2", "Enable ID3v2 tag writing", OFFSET(id3v2tag), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC}, |
| { "write_apetag", "Enable APE tag writing", OFFSET(apetag), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC}, |
| { "write_mpeg2", "Use MPE2 ID when writing", OFFSET(mpeg_id), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, ENC, "mpeg_id"}, |
| { NULL }, |
| }; |
| |
| static const AVClass adts_muxer_class = { |
| .class_name = "ADTS muxer", |
| .item_name = av_default_item_name, |
| .option = options, |
| .version = LIBAVUTIL_VERSION_INT, |
| }; |
| |
| AVOutputFormat ff_adts_muxer = { |
| .name = "adts", |
| .long_name = NULL_IF_CONFIG_SMALL("ADTS AAC (Advanced Audio Coding)"), |
| .mime_type = "audio/aac", |
| .extensions = "aac,adts", |
| .priv_data_size = sizeof(ADTSContext), |
| .audio_codec = AV_CODEC_ID_AAC, |
| .video_codec = AV_CODEC_ID_NONE, |
| .init = adts_init, |
| .write_header = adts_write_header, |
| .write_packet = adts_write_packet, |
| .write_trailer = adts_write_trailer, |
| .priv_class = &adts_muxer_class, |
| .flags = AVFMT_NOTIMESTAMPS, |
| }; |
