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ffmpeg / libavformat / oma.c @ d9dee728

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/*
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 * Sony OpenMG (OMA) demuxer
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 *
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 * Copyright (c) 2008 Maxim Poliakovski
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 *               2008 Benjamin Larsson
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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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/**
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 * @file
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 * This is a demuxer for Sony OpenMG Music files
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 *
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 * Known file extensions: ".oma", "aa3"
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 * The format of such files consists of three parts:
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 * - "ea3" header carrying overall info and metadata. Except for starting with
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 *   "ea" instead of "ID", it's an ID3v2 header.
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 * - "EA3" header is a Sony-specific header containing information about
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 *   the OpenMG file: codec type (usually ATRAC, can also be MP3 or WMA),
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 *   codec specific info (packet size, sample rate, channels and so on)
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 *   and DRM related info (file encryption, content id).
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 * - Sound data organized in packets follow the EA3 header
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 *   (can be encrypted using the Sony DRM!).
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 *
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 * LIMITATIONS: This version supports only plain (unencrypted) OMA files.
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 * If any DRM-protected (encrypted) file is encountered you will get the
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 * corresponding error message. Try to remove the encryption using any
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 * Sony software (for example SonicStage).
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 * CODEC SUPPORT: Only ATRAC3 codec is currently supported!
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 */
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#include "avformat.h"
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#include "libavutil/intreadwrite.h"
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#include "pcm.h"
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#include "riff.h"
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#include "id3v2.h"
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#define EA3_HEADER_SIZE 96
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enum {
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    OMA_CODECID_ATRAC3  = 0,
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    OMA_CODECID_ATRAC3P = 1,
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    OMA_CODECID_MP3     = 3,
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    OMA_CODECID_LPCM    = 4,
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    OMA_CODECID_WMA     = 5,
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};
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static const AVCodecTag codec_oma_tags[] = {
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    { CODEC_ID_ATRAC3,  OMA_CODECID_ATRAC3 },
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    { CODEC_ID_ATRAC3P, OMA_CODECID_ATRAC3P },
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    { CODEC_ID_MP3,     OMA_CODECID_MP3 },
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};
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#define ID3v2_EA3_MAGIC "ea3"
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static int oma_read_header(AVFormatContext *s,
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                           AVFormatParameters *ap)
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{
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    static const uint16_t srate_tab[6] = {320,441,480,882,960,0};
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    int     ret, framesize, jsflag, samplerate;
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    uint32_t codec_params;
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    int16_t eid;
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    uint8_t buf[EA3_HEADER_SIZE];
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    uint8_t *edata;
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    AVStream *st;
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    ff_id3v2_read(s, ID3v2_EA3_MAGIC);
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    ret = avio_read(s->pb, buf, EA3_HEADER_SIZE);
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    if (memcmp(buf, ((const uint8_t[]){'E', 'A', '3'}),3) || buf[4] != 0 || buf[5] != EA3_HEADER_SIZE) {
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        av_log(s, AV_LOG_ERROR, "Couldn't find the EA3 header !\n");
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        return -1;
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    }
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    eid = AV_RB16(&buf[6]);
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    if (eid != -1 && eid != -128) {
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        av_log(s, AV_LOG_ERROR, "Encrypted file! Eid: %d\n", eid);
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        return -1;
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    }
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    codec_params = AV_RB24(&buf[33]);
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    st = av_new_stream(s, 0);
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    if (!st)
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        return AVERROR(ENOMEM);
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    st->start_time = 0;
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    st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
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    st->codec->codec_tag   = buf[32];
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    st->codec->codec_id    = ff_codec_get_id(codec_oma_tags, st->codec->codec_tag);
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    switch (buf[32]) {
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        case OMA_CODECID_ATRAC3:
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            samplerate = srate_tab[(codec_params >> 13) & 7]*100;
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            if (samplerate != 44100)
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                av_log_ask_for_sample(s, "Unsupported sample rate: %d\n",
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                                      samplerate);
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            framesize = (codec_params & 0x3FF) * 8;
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            jsflag = (codec_params >> 17) & 1; /* get stereo coding mode, 1 for joint-stereo */
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            st->codec->channels    = 2;
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            st->codec->sample_rate = samplerate;
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            st->codec->bit_rate    = st->codec->sample_rate * framesize * 8 / 1024;
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            /* fake the atrac3 extradata (wav format, makes stream copy to wav work) */
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            st->codec->extradata_size = 14;
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            edata = av_mallocz(14 + FF_INPUT_BUFFER_PADDING_SIZE);
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            if (!edata)
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                return AVERROR(ENOMEM);
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            st->codec->extradata = edata;
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            AV_WL16(&edata[0],  1);             // always 1
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            AV_WL32(&edata[2],  samplerate);    // samples rate
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            AV_WL16(&edata[6],  jsflag);        // coding mode
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            AV_WL16(&edata[8],  jsflag);        // coding mode
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            AV_WL16(&edata[10], 1);             // always 1
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            // AV_WL16(&edata[12], 0);          // always 0
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            av_set_pts_info(st, 64, 1, st->codec->sample_rate);
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            break;
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        case OMA_CODECID_ATRAC3P:
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            st->codec->channels = (codec_params >> 10) & 7;
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            framesize = ((codec_params & 0x3FF) * 8) + 8;
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            st->codec->sample_rate = srate_tab[(codec_params >> 13) & 7]*100;
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            st->codec->bit_rate    = st->codec->sample_rate * framesize * 8 / 1024;
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            av_set_pts_info(st, 64, 1, st->codec->sample_rate);
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            av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n");
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            break;
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        case OMA_CODECID_MP3:
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            st->need_parsing = AVSTREAM_PARSE_FULL;
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            framesize = 1024;
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            break;
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        default:
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            av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]);
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            return -1;
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            break;
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    }
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    st->codec->block_align = framesize;
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    return 0;
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}
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static int oma_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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    int ret = av_get_packet(s->pb, pkt, s->streams[0]->codec->block_align);
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    pkt->stream_index = 0;
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    if (ret <= 0)
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        return AVERROR(EIO);
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    return ret;
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}
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static int oma_read_probe(AVProbeData *p)
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{
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    const uint8_t *buf;
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    unsigned tag_len = 0;
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    buf = p->buf;
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    /* version must be 3 and flags byte zero */
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    if (ff_id3v2_match(buf, ID3v2_EA3_MAGIC) && buf[3] == 3 && !buf[4])
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        tag_len = ff_id3v2_tag_len(buf);
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    // This check cannot overflow as tag_len has at most 28 bits
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    if (p->buf_size < tag_len + 5)
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        return 0;
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    buf += tag_len;
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    if (!memcmp(buf, "EA3", 3) && !buf[4] && buf[5] == EA3_HEADER_SIZE)
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        return AVPROBE_SCORE_MAX;
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    else
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        return 0;
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}
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AVInputFormat ff_oma_demuxer = {
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    "oma",
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    NULL_IF_CONFIG_SMALL("Sony OpenMG audio"),
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    0,
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    oma_read_probe,
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    oma_read_header,
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    oma_read_packet,
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    0,
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    pcm_read_seek,
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    .flags= AVFMT_GENERIC_INDEX,
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    .extensions = "oma,aa3",
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    .codec_tag= (const AVCodecTag* const []){codec_oma_tags, 0},
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};
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