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>
124 lines
4 KiB
C
124 lines
4 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 "platform.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",3)) {
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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",3)) {
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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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/* is file using encryption */
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if (buf[0x13]==0x08) {
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DEBUGF("get_adx_metadata: error, encrypted ADX not supported\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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