| /* |
| * Sony OpenMG (OMA) demuxer |
| * |
| * Copyright (c) 2008 Maxim Poliakovski |
| * 2008 Benjamin Larsson |
| * |
| * 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 |
| */ |
| |
| /** |
| * @file libavformat/oma.c |
| * This is a demuxer for Sony OpenMG Music files |
| * |
| * Known file extensions: ".oma", "aa3" |
| * The format of such files consists of three parts: |
| * - "ea3" header carrying overall info and metadata. |
| * - "EA3" header is a Sony-specific header containing information about |
| * the OpenMG file: codec type (usually ATRAC, can also be MP3 or WMA), |
| * codec specific info (packet size, sample rate, channels and so on) |
| * and DRM related info (file encryption, content id). |
| * - Sound data organized in packets follow the EA3 header |
| * (can be encrypted using the Sony DRM!). |
| * |
| * LIMITATIONS: This version supports only plain (unencrypted) OMA files. |
| * If any DRM-protected (encrypted) file is encountered you will get the |
| * corresponding error message. Try to remove the encryption using any |
| * Sony software (for example SonicStage). |
| * CODEC SUPPORT: Only ATRAC3 codec is currently supported! |
| */ |
| |
| #include "avformat.h" |
| #include "libavutil/intreadwrite.h" |
| #include "raw.h" |
| #include "riff.h" |
| |
| #define EA3_HEADER_SIZE 96 |
| |
| enum { |
| OMA_CODECID_ATRAC3 = 0, |
| OMA_CODECID_ATRAC3P = 1, |
| OMA_CODECID_MP3 = 3, |
| OMA_CODECID_LPCM = 4, |
| OMA_CODECID_WMA = 5, |
| }; |
| |
| static const AVCodecTag codec_oma_tags[] = { |
| { CODEC_ID_ATRAC3, OMA_CODECID_ATRAC3 }, |
| { CODEC_ID_ATRAC3P, OMA_CODECID_ATRAC3P }, |
| { CODEC_ID_MP3, OMA_CODECID_MP3 }, |
| }; |
| |
| static int oma_read_header(AVFormatContext *s, |
| AVFormatParameters *ap) |
| { |
| static const uint16_t srate_tab[6] = {320,441,480,882,960,0}; |
| int ret, ea3_taglen, EA3_pos, framesize, jsflag, samplerate; |
| uint32_t codec_params; |
| int16_t eid; |
| uint8_t buf[EA3_HEADER_SIZE]; |
| uint8_t *edata; |
| AVStream *st; |
| |
| ret = get_buffer(s->pb, buf, 10); |
| if (ret != 10) |
| return -1; |
| |
| ea3_taglen = ((buf[6] & 0x7f) << 21) | ((buf[7] & 0x7f) << 14) | ((buf[8] & 0x7f) << 7) | (buf[9] & 0x7f); |
| |
| EA3_pos = ea3_taglen + 10; |
| if (buf[5] & 0x10) |
| EA3_pos += 10; |
| |
| url_fseek(s->pb, EA3_pos, SEEK_SET); |
| ret = get_buffer(s->pb, buf, EA3_HEADER_SIZE); |
| if (ret != EA3_HEADER_SIZE) |
| return -1; |
| |
| if (memcmp(buf, (const uint8_t[]){'E', 'A', '3'},3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) { |
| av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n"); |
| return -1; |
| } |
| |
| eid = AV_RB16(&buf[6]); |
| if (eid != -1 && eid != -128) { |
| av_log(s, AV_LOG_ERROR, "Encrypted file! Eid: %d\n", eid); |
| return -1; |
| } |
| |
| codec_params = AV_RB24(&buf[33]); |
| |
| st = av_new_stream(s, 0); |
| if (!st) |
| return AVERROR(ENOMEM); |
| |
| st->start_time = 0; |
| st->codec->codec_type = CODEC_TYPE_AUDIO; |
| st->codec->codec_tag = buf[32]; |
| st->codec->codec_id = codec_get_id(codec_oma_tags, st->codec->codec_tag); |
| |
| switch (buf[32]) { |
| case OMA_CODECID_ATRAC3: |
| samplerate = srate_tab[(codec_params >> 13) & 7]*100; |
| if (samplerate != 44100) |
| av_log(s, AV_LOG_ERROR, "Unsupported sample rate, send sample file to developers: %d\n", samplerate); |
| |
| framesize = (codec_params & 0x3FF) * 8; |
| jsflag = (codec_params >> 17) & 1; /* get stereo coding mode, 1 for joint-stereo */ |
| st->codec->channels = 2; |
| st->codec->sample_rate = samplerate; |
| st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024; |
| |
| /* fake the atrac3 extradata (wav format, makes stream copy to wav work) */ |
| st->codec->extradata_size = 14; |
| edata = av_mallocz(14 + FF_INPUT_BUFFER_PADDING_SIZE); |
| if (!edata) |
| return AVERROR(ENOMEM); |
| |
| st->codec->extradata = edata; |
| AV_WL16(&edata[0], 1); // always 1 |
| AV_WL32(&edata[2], samplerate); // samples rate |
| AV_WL16(&edata[6], jsflag); // coding mode |
| AV_WL16(&edata[8], jsflag); // coding mode |
| AV_WL16(&edata[10], 1); // always 1 |
| // AV_WL16(&edata[12], 0); // always 0 |
| |
| av_set_pts_info(st, 64, 1, st->codec->sample_rate); |
| break; |
| case OMA_CODECID_ATRAC3P: |
| st->codec->channels = (codec_params >> 10) & 7; |
| framesize = ((codec_params & 0x3FF) * 8) + 8; |
| st->codec->sample_rate = srate_tab[(codec_params >> 13) & 7]*100; |
| st->codec->bit_rate = st->codec->sample_rate * framesize * 8 / 1024; |
| av_set_pts_info(st, 64, 1, st->codec->sample_rate); |
| av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n"); |
| break; |
| case OMA_CODECID_MP3: |
| st->need_parsing = AVSTREAM_PARSE_FULL; |
| framesize = 1024; |
| break; |
| default: |
| av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]); |
| return -1; |
| break; |
| } |
| |
| st->codec->block_align = framesize; |
| url_fseek(s->pb, EA3_pos + EA3_HEADER_SIZE, SEEK_SET); |
| |
| return 0; |
| } |
| |
| |
| static int oma_read_packet(AVFormatContext *s, AVPacket *pkt) |
| { |
| int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align); |
| |
| pkt->stream_index = 0; |
| if (ret <= 0) |
| return AVERROR(EIO); |
| |
| return ret; |
| } |
| |
| static int oma_read_probe(AVProbeData *p) |
| { |
| if (!memcmp(p->buf, (const uint8_t[]){'e', 'a', '3', 3, 0},5)) |
| return AVPROBE_SCORE_MAX; |
| else |
| return 0; |
| } |
| |
| |
| AVInputFormat oma_demuxer = { |
| "oma", |
| NULL_IF_CONFIG_SMALL("Sony OpenMG audio"), |
| 0, |
| oma_read_probe, |
| oma_read_header, |
| oma_read_packet, |
| 0, |
| pcm_read_seek, |
| .flags= AVFMT_GENERIC_INDEX, |
| .extensions = "oma,aa3", |
| .codec_tag= (const AVCodecTag* const []){codec_oma_tags, 0}, |
| }; |
| |
