128 lines
3.9 KiB
C
128 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 "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 "logf.h"
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bool get_flac_metadata(int fd, struct mp3entry* id3)
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{
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/* A simple parser to read vital metadata from a FLAC file - length,
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* frequency, bitrate etc. This code should either be moved to a
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* seperate file, or discarded in favour of the libFLAC code.
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* The FLAC stream specification can be found at
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* http://flac.sourceforge.net/format.html#stream
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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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bool last_metadata = false;
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bool rc = false;
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if (!skip_id3v2(fd, id3) || (read(fd, buf, 4) < 4))
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{
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return rc;
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}
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if (memcmp(buf, "fLaC", 4) != 0)
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{
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return rc;
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}
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while (!last_metadata)
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{
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unsigned long i;
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int type;
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if (read(fd, buf, 4) < 0)
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{
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return rc;
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}
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last_metadata = buf[0] & 0x80;
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type = buf[0] & 0x7f;
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/* The length of the block */
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i = (buf[1] << 16) | (buf[2] << 8) | buf[3];
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if (type == 0) /* 0 is the STREAMINFO block */
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{
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unsigned long totalsamples;
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if (i >= sizeof(id3->path) || read(fd, buf, i) < 0)
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{
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return rc;
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}
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id3->vbr = true; /* All FLAC files are VBR */
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id3->filesize = filesize(fd);
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id3->frequency = (buf[10] << 12) | (buf[11] << 4)
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| ((buf[12] & 0xf0) >> 4);
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rc = true; /* Got vital metadata */
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/* totalsamples is a 36-bit field, but we assume <= 32 bits are used */
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totalsamples = get_long_be(&buf[14]);
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if(totalsamples > 0)
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{
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/* Calculate track length (in ms) and estimate the bitrate (in kbit/s) */
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id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
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id3->bitrate = (id3->filesize * 8) / id3->length;
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}
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else if (totalsamples == 0)
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{
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id3->length = 0;
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id3->bitrate = 0;
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}
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else
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{
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logf("flac length invalid!");
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return false;
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}
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}
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else if (type == 4) /* 4 is the VORBIS_COMMENT block */
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{
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/* The next i bytes of the file contain the VORBIS COMMENTS. */
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if (read_vorbis_tags(fd, id3, i) == 0)
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{
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return rc;
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}
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}
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else if (!last_metadata)
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{
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/* Skip to next metadata block */
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if (lseek(fd, i, SEEK_CUR) < 0)
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{
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return rc;
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}
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}
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}
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return true;
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}
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