cadb3627fc
librbcodec users must provide these two files when the library is built. rbcodecconfig.h provides configuration #defines and basic types, and will be included by public librbcodec headers, so it must not conflict with the user's code. rbcodecplatform.h provides various OS functions, and will only be included by source files and private headers. This system is intended to provide maximum flexibility for use on embedded systems, where no operating system headers are included. Unix systems can just copy rbcodecconfig-example.h and rbcodecplatform-unix.h with minimal changes. Change-Id: I350a2274d173da391fd1ca00c4202e9760d91def Reviewed-on: http://gerrit.rockbox.org/143 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
103 lines
3.1 KiB
C
103 lines
3.1 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 Dave Chapman
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include <stdio.h>
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#include "metadata.h"
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#include "logf.h"
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#include "metadata_parsers.h"
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#include "platform.h"
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static const unsigned short a52_bitrates[] =
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{
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32, 40, 48, 56, 64, 80, 96, 112, 128, 160,
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192, 224, 256, 320, 384, 448, 512, 576, 640
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};
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/* Only store frame sizes for 44.1KHz - others are simply multiples
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of the bitrate */
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static const unsigned short a52_441framesizes[] =
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{
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69 * 2, 70 * 2, 87 * 2, 88 * 2, 104 * 2, 105 * 2, 121 * 2,
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122 * 2, 139 * 2, 140 * 2, 174 * 2, 175 * 2, 208 * 2, 209 * 2,
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243 * 2, 244 * 2, 278 * 2, 279 * 2, 348 * 2, 349 * 2, 417 * 2,
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418 * 2, 487 * 2, 488 * 2, 557 * 2, 558 * 2, 696 * 2, 697 * 2,
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835 * 2, 836 * 2, 975 * 2, 976 * 2, 1114 * 2, 1115 * 2, 1253 * 2,
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1254 * 2, 1393 * 2, 1394 * 2
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};
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bool get_a52_metadata(int fd, struct mp3entry *id3)
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{
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/* Use the trackname part of the id3 structure as a temporary buffer */
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unsigned char* buf = (unsigned char *)id3->path;
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unsigned long totalsamples;
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int i;
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if ((lseek(fd, 0, SEEK_SET) < 0) || (read(fd, buf, 5) < 5))
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{
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return false;
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}
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if ((buf[0] != 0x0b) || (buf[1] != 0x77))
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{
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logf("not an A52/AC3 file\n");
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return false;
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}
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i = buf[4] & 0x3e;
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if (i > 36)
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{
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logf("A52: Invalid frmsizecod: %d\n",i);
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return false;
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}
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id3->bitrate = a52_bitrates[i >> 1];
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id3->vbr = false;
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id3->filesize = filesize(fd);
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switch (buf[4] & 0xc0)
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{
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case 0x00:
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id3->frequency = 48000;
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id3->bytesperframe=id3->bitrate * 2 * 2;
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break;
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case 0x40:
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id3->frequency = 44100;
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id3->bytesperframe = a52_441framesizes[i];
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break;
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case 0x80:
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id3->frequency = 32000;
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id3->bytesperframe = id3->bitrate * 3 * 2;
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break;
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default:
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logf("A52: Invalid samplerate code: 0x%02x\n", buf[4] & 0xc0);
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return false;
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break;
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}
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/* One A52 frame contains 6 blocks, each containing 256 samples */
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totalsamples = id3->filesize / id3->bytesperframe * 6 * 256;
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id3->length = totalsamples / id3->frequency * 1000;
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return true;
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}
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