1 files changed, 188 insertions, 0 deletions

diff --git a/apps/metadata/oma.c b/apps/metadata/oma.c
new file mode 100644
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+++ b/apps/metadata/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 <stdlib.h>
+#include <inttypes.h>
+#include <string.h>
+#include "metadata.h"
+#include "metadata_parsers.h"
+
+#define EA3_HEADER_SIZE 96
+
+#if 0
+#define DEBUGF printf
+#else
+#define DEBUGF(...)
+#endif
+
+/* Various helper macros taken from ffmpeg for reading *
+ * and writing buffers with a specified endianess.     */
+#   define AV_RB16(x)                           \
+    ((((const uint8_t*)(x))[0] << 8) |          \
+      ((const uint8_t*)(x))[1])
+#   define AV_RB24(x)                           \
+    ((((const uint8_t*)(x))[0] << 16) |         \
+     (((const uint8_t*)(x))[1] <<  8) |         \
+      ((const uint8_t*)(x))[2])
+#   define AV_RB32(x)                           \
+    ((((const uint8_t*)(x))[0] << 24) |         \
+     (((const uint8_t*)(x))[1] << 16) |         \
+     (((const uint8_t*)(x))[2] <<  8) |         \
+      ((const uint8_t*)(x))[3])
+#   define AV_WL32(p, d) do {                   \
+        ((uint8_t*)(p))[0] = (d);               \
+        ((uint8_t*)(p))[1] = (d)>>8;            \
+        ((uint8_t*)(p))[2] = (d)>>16;           \
+        ((uint8_t*)(p))[3] = (d)>>24;           \
+    } while(0)
+#   define AV_WL16(p, d) do {                   \
+        ((uint8_t*)(p))[0] = (d);               \
+        ((uint8_t*)(p))[1] = (d)>>8;            \
+    } while(0)
+
+/* Different codecs that could be present in a Sony OMA *
+ * container file.                                      */
+enum {
+    OMA_CODECID_ATRAC3  = 0,
+    OMA_CODECID_ATRAC3P = 1,
+    OMA_CODECID_MP3     = 3,
+    OMA_CODECID_LPCM    = 4,
+    OMA_CODECID_WMA     = 5,
+};
+
+/* FIXME: This functions currently read different file *
+ *        parameters required for decoding. It still   *
+ *        does not read the metadata - which should be *
+ *        present in the ea3 (first) header. The       *
+ *        metadata in ea3 is stored as a variation of  *
+ *        the ID3v2 metadata format.                   */
+int oma_read_header(int fd, struct mp3entry* id3)
+{
+    static const uint16_t srate_tab[6] = {320,441,480,882,960,0};
+    int     ret, ea3_taglen, EA3_pos, jsflag;
+    uint32_t codec_params;
+    int16_t eid;
+    uint8_t buf[EA3_HEADER_SIZE];
+
+    ret = read(fd, 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;
+
+    lseek(fd, EA3_pos, SEEK_SET);
+    ret = read(fd, 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) {
+        DEBUGF("Couldn't find the EA3 header !\n");
+        return -1;
+    }
+
+    eid = AV_RB16(&buf[6]);
+    if (eid != -1 && eid != -128) {
+        DEBUGF("Encrypted file! Eid: %d\n", eid);
+        return -1;
+    }
+
+    codec_params = AV_RB24(&buf[33]);
+
+    switch (buf[32]) {
+        case OMA_CODECID_ATRAC3:
+            id3->frequency = srate_tab[(codec_params >> 13) & 7]*100;
+            if (id3->frequency != 44100) {
+                DEBUGF("Unsupported sample rate, send sample file to developers: %d\n", samplerate);
+                return -1;
+            }
+
+            id3->bytesperframe = (codec_params & 0x3FF) * 8;
+            id3->codectype = AFMT_OMA_ATRAC3;
+            jsflag = (codec_params >> 17) & 1; /* get stereo coding mode, 1 for joint-stereo */
+
+            id3->bitrate = id3->frequency * id3->bytesperframe * 8 / (1024 * 1000);
+
+            /* fake the atrac3 extradata (wav format, makes stream copy to wav work) */
+            /* ATRAC3 expects and extra-data size of 14 bytes for wav format; extra-data size    *
+             * is stored in ATRAC3Context before initializing the decoder. See atrac3_oma.codec. *
+             * We use id3v2buf to hold the (fake) extra-data provided from the container.        */ 
+
+            AV_WL16(&id3->id3v1buf[0][0],  1);             // always 1
+            AV_WL32(&id3->id3v1buf[0][2],  id3->frequency);    // samples rate
+            AV_WL16(&id3->id3v1buf[0][6],  jsflag);        // coding mode
+            AV_WL16(&id3->id3v1buf[0][8],  jsflag);        // coding mode
+            AV_WL16(&id3->id3v1buf[0][10], 1);             // always 1
+            AV_WL16(&id3->id3v1buf[0][12], 0);             // always 0
+
+            DEBUGF("sample_rate = %d\n", id3->frequency);
+            DEBUGF("frame_size = %d\n", id3->bytesperframe);
+            DEBUGF("stereo_coding_mode = %d\n", jsflag);
+            break;
+        default:
+            DEBUGF("Unsupported codec %d!\n",buf[32]);
+            return -1;
+            break;
+    }
+
+    /* Store the the offset of the first audio frame, to be able to seek to it *
+     * directly in atrac3_oma.codec.                                           */
+    id3->first_frame_offset = EA3_pos + EA3_HEADER_SIZE; 
+    return 0;
+}
+
+bool get_oma_metadata(int fd, struct mp3entry* id3)
+{
+    if(oma_read_header(fd, id3) < 0)
+        return false;
+
+    /* Currently, there's no means of knowing the duration *
+     * directly from the the file so we calculate it.      */
+    id3->filesize = filesize(fd);
+    id3->length   = ((id3->filesize - id3->first_frame_offset) * 8) / id3->bitrate;
+    return true;
+}