2d00f0c8b2
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29685 a1c6a512-1295-4272-9138-f99709370657
118 lines
3.9 KiB
C
118 lines
3.9 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 <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <inttypes.h>
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#include "system.h"
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#include "metadata.h"
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#include "metadata_common.h"
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#include "metadata_parsers.h"
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#include "debug.h"
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bool get_adx_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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int chanstart, channels;
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int looping = 0, start_adr = 0, end_adr = 0;
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/* try to get the basic header */
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if ((lseek(fd, 0, SEEK_SET) < 0)
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|| (read(fd, buf, 0x38) < 0x38))
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{
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DEBUGF("lseek or read failed\n");
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return false;
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}
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/* ADX starts with 0x80 */
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if (buf[0] != 0x80) {
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DEBUGF("get_adx_metadata: wrong first byte %c\n",buf[0]);
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return false;
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}
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/* check for a reasonable offset */
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chanstart = ((buf[2] << 8) | buf[3]) + 4;
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if (chanstart > 4096) {
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DEBUGF("get_adx_metadata: bad chanstart %i\n", chanstart);
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return false;
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}
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/* check for a workable number of channels */
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channels = buf[7];
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if (channels != 1 && channels != 2) {
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DEBUGF("get_adx_metadata: bad channel count %i\n",channels);
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return false;
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}
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id3->frequency = get_long_be(&buf[8]);
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/* 32 samples per 18 bytes */
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id3->bitrate = id3->frequency * channels * 18 * 8 / 32 / 1000;
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id3->length = get_long_be(&buf[12]) / id3->frequency * 1000;
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id3->vbr = false;
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id3->filesize = filesize(fd);
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/* get loop info */
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if (!memcmp(buf+0x10,"\x01\xF4\x03\x00",4)) {
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/* Soul Calibur 2 style (type 03) */
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DEBUGF("get_adx_metadata: type 03 found\n");
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/* check if header is too small for loop data */
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if (chanstart-6 < 0x2c) looping=0;
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else {
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looping = get_long_be(&buf[0x18]);
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end_adr = get_long_be(&buf[0x28]);
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start_adr = get_long_be(&buf[0x1c])/32*channels*18+chanstart;
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}
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} else if (!memcmp(buf+0x10,"\x01\xF4\x04\x00",4)) {
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/* Standard (type 04) */
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DEBUGF("get_adx_metadata: type 04 found\n");
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/* check if header is too small for loop data */
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if (chanstart-6 < 0x38) looping=0;
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else {
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looping = get_long_be(&buf[0x24]);
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end_adr = get_long_be(&buf[0x34]);
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start_adr = get_long_be(&buf[0x28])/32*channels*18+chanstart;
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}
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} else {
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DEBUGF("get_adx_metadata: error, couldn't determine ADX type\n");
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return false;
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}
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if (looping) {
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/* 2 loops, 10 second fade */
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id3->length = (start_adr-chanstart + 2*(end_adr-start_adr))
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*8 / id3->bitrate + 10000;
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}
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/* try to get the channel header */
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if ((lseek(fd, chanstart-6, SEEK_SET) < 0)
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|| (read(fd, buf, 6) < 6))
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{
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return false;
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}
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/* check channel header */
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if (memcmp(buf, "(c)CRI", 6) != 0) return false;
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return true;
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}
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