159 lines
4.6 KiB
C
159 lines
4.6 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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/* compressionType: AIFC QuickTime IMA ADPCM */
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#define AIFC_FORMAT_QT_IMA_ADPCM "ima4"
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static void read_id3_tags(int fd, struct mp3entry* id3)
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{
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id3->tracknum = 0;
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id3->discnum = 0;
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setid3v2title(fd, id3);
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}
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bool get_aiff_metadata(int fd, struct mp3entry* id3)
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{
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unsigned char buf[512];
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unsigned long numChannels = 0;
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unsigned long numSampleFrames = 0;
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unsigned long numbytes = 0;
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unsigned long offset = 0;
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bool is_aifc = false;
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char *p=id3->id3v2buf;
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if ((lseek(fd, 0, SEEK_SET) < 0) || (read(fd, &buf[0], 12) < 12) ||
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(memcmp(&buf[0], "FORM", 4) != 0) || (memcmp(&buf[8], "AIF", 3) != 0) ||
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(!(is_aifc = (buf[11] == 'C')) && buf[11] != 'F'))
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{
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return false;
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}
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while (read(fd, &buf[0], 8) == 8)
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{
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size_t size = get_long_be(&buf[4]); /* chunkSize */
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if (memcmp(&buf[0], "SSND", 4) == 0)
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{
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numbytes = size - 8;
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/* check for ID3 tag */
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offset=lseek(fd, 0, SEEK_CUR);
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lseek(fd, size, SEEK_CUR);
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if ((read(fd, &buf[0], 8) == 8) && (memcmp(&buf[0], "ID3", 3) == 0))
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{
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id3->id3v2len = get_long_be(&buf[4]);
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read_id3_tags(fd, id3);
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}
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else
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DEBUGF("ID3 tag not present immediately after sound data");
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lseek(fd, offset, SEEK_SET);
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break; /* assume COMM was already read */
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}
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/* odd chunk sizes must be padded */
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size += size & 1;
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if (size > sizeof(buf))
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{
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DEBUGF("AIFF \"%4.4s\" chunk too large (%zd > %zd)",
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(char*) &buf[0], size, sizeof(buf));
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}
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if (memcmp(&buf[0], "NAME", 4) == 0)
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{
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read_string(fd, p, 512, 0, size);
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id3->title=p;
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p+=size;
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}
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else if (memcmp(&buf[0], "AUTH", 4) == 0)
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{
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read_string(fd, p, 512, 0, size);
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id3->artist=p;
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p+=size;
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}
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else if (memcmp(&buf[0], "ANNO", 4) == 0)
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{
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read_string(fd, p, 512, 0, size);
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id3->comment=p;
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p+=size;
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}
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else if (memcmp(&buf[0], "ID3", 3) == 0)
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{
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read_id3_tags(fd, id3);
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}
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else if (memcmp(&buf[0], "COMM", 4) == 0)
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{
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if (size > sizeof(buf) || read(fd, &buf[0], size) != (ssize_t)size)
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return false;
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numChannels = ((buf[0]<<8)|buf[1]);
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numSampleFrames = get_long_be(&buf[2]);
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/* sampleRate */
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id3->frequency = get_long_be(&buf[10]);
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id3->frequency >>= (16+14-buf[9]);
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/* save format infos */
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id3->bitrate = ((buf[6]<<8)|buf[7]) * numChannels * id3->frequency;
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id3->bitrate /= 1000;
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if (!is_aifc || memcmp(&buf[18], AIFC_FORMAT_QT_IMA_ADPCM, 4) != 0)
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id3->length = ((int64_t) numSampleFrames * 1000) / id3->frequency;
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else
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{
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/* QuickTime IMA ADPCM is 1block = 64 data for each channel */
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id3->length = ((int64_t) numSampleFrames * 64000LL) / id3->frequency;
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}
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id3->vbr = false; /* AIFF files are CBR */
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id3->filesize = filesize(fd);
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}
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else
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{
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/* skip chunk */
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if (lseek(fd, size, SEEK_CUR) < 0)
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return false;
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}
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}
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return numbytes && numChannels;
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}
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