Oma demuxer

Originally committed as revision 13712 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 190 insertions, 0 deletions

diff --git a/libavformat/oma.c b/libavformat/oma.c
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+++ b/libavformat/oma.c
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+/*
+ * 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 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,
+};
+
+static const AVCodecTag codec_oma_tags[] = {
+    { CODEC_ID_ATRAC3,  OMA_CODECID_ATRAC3 },
+    { CODEC_ID_ATRAC3P, OMA_CODECID_ATRAC3P },
+};
+
+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, channel_id;
+    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, (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]);
+    channel_id = (codec_params >> 10) & 7;
+    samplerate = srate_tab[(codec_params >> 13) & 7]*100;
+
+    st = av_new_stream(s, 0);
+    if (!st)
+        return AVERROR(ENOMEM);
+
+    switch (buf[32]) {
+        case OMA_CODECID_ATRAC3:
+            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 */
+            channel_id = 2;
+
+            /* 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
+            break;
+        case OMA_CODECID_ATRAC3P:
+            framesize = ((codec_params & 0x3FF) * 8) + 8;
+            av_log(s, AV_LOG_ERROR, "Unsupported codec ATRAC3+!\n");
+            break;
+        default:
+            av_log(s, AV_LOG_ERROR, "Unsupported codec %d!\n",buf[32]);
+            return -1;
+            break;
+    }
+
+    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);
+    st->codec->channels    = channel_id;
+    st->codec->sample_rate = samplerate;
+    st->codec->bit_rate    = samplerate * framesize * 8 / 1024;
+    st->codec->block_align = framesize;
+
+    st->start_time = 0;
+    av_set_pts_info(st, 64, 1, st->codec->sample_rate);
+
+    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, (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*[]){codec_oma_tags, 0},
+};
+