2acc0ac542
later. We still need to hunt down snippets used that are not. 1324 modified files... http://www.rockbox.org/mail/archive/rockbox-dev-archive-2008-06/0060.shtml git-svn-id: svn://svn.rockbox.org/rockbox/trunk@17847 a1c6a512-1295-4272-9138-f99709370657
131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
/***************************************************************************
|
|
* __________ __ ___.
|
|
* 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 "id3.h"
|
|
#include "metadata_common.h"
|
|
#include "metadata_parsers.h"
|
|
|
|
bool get_wave_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 totalsamples = 0;
|
|
unsigned long channels = 0;
|
|
unsigned long bitspersample = 0;
|
|
unsigned long numbytes = 0;
|
|
int read_bytes;
|
|
int i;
|
|
|
|
/* get RIFF chunk header */
|
|
if ((lseek(fd, 0, SEEK_SET) < 0)
|
|
|| ((read_bytes = read(fd, buf, 12)) < 12))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if ((memcmp(buf, "RIFF",4) != 0)
|
|
|| (memcmp(&buf[8], "WAVE", 4) !=0 ))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
/* iterate over WAVE chunks until 'data' chunk */
|
|
while (true)
|
|
{
|
|
/* get chunk header */
|
|
if ((read_bytes = read(fd, buf, 8)) < 8)
|
|
return false;
|
|
|
|
/* chunkSize */
|
|
i = get_long_le(&buf[4]);
|
|
|
|
if (memcmp(buf, "fmt ", 4) == 0)
|
|
{
|
|
/* get rest of chunk */
|
|
if ((read_bytes = read(fd, buf, 16)) < 16)
|
|
return false;
|
|
|
|
i -= 16;
|
|
|
|
/* skipping wFormatTag */
|
|
/* wChannels */
|
|
channels = buf[2] | (buf[3] << 8);
|
|
/* dwSamplesPerSec */
|
|
id3->frequency = get_long_le(&buf[4]);
|
|
/* dwAvgBytesPerSec */
|
|
id3->bitrate = (get_long_le(&buf[8]) * 8) / 1000;
|
|
/* skipping wBlockAlign */
|
|
/* wBitsPerSample */
|
|
bitspersample = buf[14] | (buf[15] << 8);
|
|
}
|
|
else if (memcmp(buf, "data", 4) == 0)
|
|
{
|
|
numbytes = i;
|
|
break;
|
|
}
|
|
else if (memcmp(buf, "fact", 4) == 0)
|
|
{
|
|
/* dwSampleLength */
|
|
if (i >= 4)
|
|
{
|
|
/* get rest of chunk */
|
|
if ((read_bytes = read(fd, buf, 4)) < 4)
|
|
return false;
|
|
|
|
i -= 4;
|
|
totalsamples = get_long_le(buf);
|
|
}
|
|
}
|
|
|
|
/* seek to next chunk (even chunk sizes must be padded) */
|
|
if (i & 0x01)
|
|
i++;
|
|
|
|
if(lseek(fd, i, SEEK_CUR) < 0)
|
|
return false;
|
|
}
|
|
|
|
if ((numbytes == 0) || (channels == 0))
|
|
{
|
|
return false;
|
|
}
|
|
|
|
if (totalsamples == 0)
|
|
{
|
|
/* for PCM only */
|
|
totalsamples = numbytes
|
|
/ ((((bitspersample - 1) / 8) + 1) * channels);
|
|
}
|
|
|
|
id3->vbr = false; /* All WAV files are CBR */
|
|
id3->filesize = filesize(fd);
|
|
|
|
/* Calculate track length (in ms) and estimate the bitrate (in kbit/s) */
|
|
id3->length = ((int64_t) totalsamples * 1000) / id3->frequency;
|
|
|
|
return true;
|
|
}
|