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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Dave Chapman
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include <inttypes.h>
#include "system.h"
#include "metadata.h"
#include "metadata_common.h"
#include "metadata_parsers.h"
/* compressionType: AIFC QuickTime IMA ADPCM */
#define AIFC_FORMAT_QT_IMA_ADPCM "ima4"
bool get_aiff_metadata(int fd, struct mp3entry* id3)
{
/* Use the trackname part of the id3 structure as a temporary buffer */
unsigned char* buf = (unsigned char *)id3->path;
unsigned long numChannels = 0;
unsigned long numSampleFrames = 0;
unsigned long numbytes = 0;
int read_bytes;
int i;
bool is_aifc = false;
if ((lseek(fd, 0, SEEK_SET) < 0) ||
((read_bytes = read(fd, buf, sizeof(id3->path))) < 54) ||
(memcmp(buf, "FORM", 4) != 0) || (memcmp(buf + 8, "AIF", 3) != 0) ||
(!(is_aifc = (buf[11] == 'C')) && buf[11] != 'F'))
{
return false;
}
i = 12;
while ((numbytes == 0) && (read_bytes >= 8))
{
buf += i;
read_bytes -= i;
/* chunkSize */
i = get_long_be(&buf[4]);
if (memcmp(buf, "COMM", 4) == 0)
{
/* numChannels */
numChannels = ((buf[8]<<8)|buf[9]);
/* numSampleFrames */
numSampleFrames = get_long_be(&buf[10]);
/* sampleRate */
id3->frequency = get_long_be(&buf[18]);
id3->frequency >>= (16+14-buf[17]);
/* save format infos */
id3->bitrate = (((buf[14]<<8)|buf[15]) * numChannels * id3->frequency) / 1000;
if (!is_aifc || memcmp(&buf[26], AIFC_FORMAT_QT_IMA_ADPCM, 4) != 0)
id3->length = ((int64_t) numSampleFrames * 1000) / id3->frequency;
else
{
/* QuickTime IMA ADPCM is 1block = 64 data for each channel */
id3->length = ((int64_t) numSampleFrames * 64000LL) / id3->frequency;
}
id3->vbr = false; /* AIFF files are CBR */
id3->filesize = filesize(fd);
}
else if (memcmp(buf, "SSND", 4) == 0)
{
numbytes = i - 8;
}
/* odd chunk sizes must be padded */
i += 8 + (i & 0x01);
}
return ((numbytes != 0) && (numChannels != 0));
}
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