forked from len0rd/rockbox
6a9a8197b3
Patch by Thomas Jarosch. git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28892 a1c6a512-1295-4272-9138-f99709370657
189 lines
6.9 KiB
C
189 lines
6.9 KiB
C
/*
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 oma.c
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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.
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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 <stdio.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <string.h>
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#include "metadata.h"
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#include "metadata_parsers.h"
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#define EA3_HEADER_SIZE 96
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#if 0
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#define DEBUGF printf
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#else
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#define DEBUGF(...)
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#endif
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/* Various helper macros taken from ffmpeg for reading *
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* and writing buffers with a specified endianess. */
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# define AV_RB16(x) \
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((((const uint8_t*)(x))[0] << 8) | \
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((const uint8_t*)(x))[1])
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# define AV_RB24(x) \
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((((const uint8_t*)(x))[0] << 16) | \
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(((const uint8_t*)(x))[1] << 8) | \
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((const uint8_t*)(x))[2])
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# define AV_RB32(x) \
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((((const uint8_t*)(x))[0] << 24) | \
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(((const uint8_t*)(x))[1] << 16) | \
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(((const uint8_t*)(x))[2] << 8) | \
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((const uint8_t*)(x))[3])
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# define AV_WL32(p, d) do { \
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((uint8_t*)(p))[0] = (d); \
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((uint8_t*)(p))[1] = (d)>>8; \
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((uint8_t*)(p))[2] = (d)>>16; \
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((uint8_t*)(p))[3] = (d)>>24; \
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} while(0)
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# define AV_WL16(p, d) do { \
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((uint8_t*)(p))[0] = (d); \
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((uint8_t*)(p))[1] = (d)>>8; \
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} while(0)
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/* Different codecs that could be present in a Sony OMA *
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* container file. */
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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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/* FIXME: This functions currently read different file *
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* parameters required for decoding. It still *
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* does not read the metadata - which should be *
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* present in the ea3 (first) header. The *
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* metadata in ea3 is stored as a variation of *
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* the ID3v2 metadata format. */
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static int oma_read_header(int fd, struct mp3entry* id3)
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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, ea3_taglen, EA3_pos, jsflag;
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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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ret = read(fd, buf, 10);
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if (ret != 10)
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return -1;
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ea3_taglen = ((buf[6] & 0x7f) << 21) | ((buf[7] & 0x7f) << 14) | ((buf[8] & 0x7f) << 7) | (buf[9] & 0x7f);
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EA3_pos = ea3_taglen + 10;
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if (buf[5] & 0x10)
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EA3_pos += 10;
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lseek(fd, EA3_pos, SEEK_SET);
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ret = read(fd, buf, EA3_HEADER_SIZE);
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if (ret != EA3_HEADER_SIZE)
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return -1;
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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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DEBUGF("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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DEBUGF("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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switch (buf[32]) {
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case OMA_CODECID_ATRAC3:
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id3->frequency = srate_tab[(codec_params >> 13) & 7]*100;
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if (id3->frequency != 44100) {
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DEBUGF("Unsupported sample rate, send sample file to developers: %d\n", id3->frequency);
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return -1;
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}
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id3->bytesperframe = (codec_params & 0x3FF) * 8;
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id3->codectype = AFMT_OMA_ATRAC3;
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jsflag = (codec_params >> 17) & 1; /* get stereo coding mode, 1 for joint-stereo */
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id3->bitrate = id3->frequency * id3->bytesperframe * 8 / (1024 * 1000);
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/* fake the atrac3 extradata (wav format, makes stream copy to wav work) */
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/* ATRAC3 expects and extra-data size of 14 bytes for wav format, and *
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* looks for that in the id3v2buf. */
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id3->extradata_size = 14;
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AV_WL16(&id3->id3v2buf[0], 1); // always 1
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AV_WL32(&id3->id3v2buf[2], id3->frequency); // samples rate
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AV_WL16(&id3->id3v2buf[6], jsflag); // coding mode
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AV_WL16(&id3->id3v2buf[8], jsflag); // coding mode
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AV_WL16(&id3->id3v2buf[10], 1); // always 1
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AV_WL16(&id3->id3v2buf[12], 0); // always 0
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id3->channels = 2;
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DEBUGF("sample_rate = %d\n", id3->frequency);
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DEBUGF("frame_size = %d\n", id3->bytesperframe);
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DEBUGF("stereo_coding_mode = %d\n", jsflag);
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break;
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default:
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DEBUGF("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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/* Store the the offset of the first audio frame, to be able to seek to it *
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* directly in atrac3_oma.codec. */
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id3->first_frame_offset = EA3_pos + EA3_HEADER_SIZE;
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return 0;
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}
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bool get_oma_metadata(int fd, struct mp3entry* id3)
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{
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if(oma_read_header(fd, id3) < 0)
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return false;
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/* Currently, there's no means of knowing the duration *
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* directly from the the file so we calculate it. */
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id3->filesize = filesize(fd);
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id3->length = ((id3->filesize - id3->first_frame_offset) * 8) / id3->bitrate;
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return true;
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}
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