2175d1edf6
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13637 a1c6a512-1295-4272-9138-f99709370657
122 lines
3.6 KiB
C
122 lines
3.6 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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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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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 "id3.h"
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#include "metadata_common.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 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 (true)
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{
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long i;
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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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/* The length of the block */
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i = (buf[1] << 16) | (buf[2] << 8) | buf[3];
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if ((buf[0] & 0x7f) == 0) /* 0 is the STREAMINFO block */
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{
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unsigned long totalsamples;
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/* FIXME: Don't trust the value of i */
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if (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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/* 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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if (id3->length <= 0)
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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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id3->bitrate = (id3->filesize * 8) / id3->length;
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}
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else if ((buf[0] & 0x7f) == 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))
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{
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return rc;
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}
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}
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else
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{
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if (buf[0] & 0x80)
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{
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/* If we have reached the last metadata block, abort. */
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break;
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}
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else
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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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}
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return true;
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}
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