4446d1bc85
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25140 a1c6a512-1295-4272-9138-f99709370657
105 lines
3.1 KiB
C
105 lines
3.1 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) 2010 Yoshihisa Uchida
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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 <inttypes.h>
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#include "system.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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static const unsigned char bitspersamples[9] = {
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0, /* encoding */
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8, /* 1: G.711 MULAW */
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8, /* 2: Linear PCM 8bit */
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16, /* 3: Linear PCM 16bit */
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24, /* 4: Linear PCM 24bit */
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32, /* 5: Linear PCM 32bit */
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32, /* 6: IEEE float 32bit */
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64, /* 7: IEEE float 64bit */
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/* encoding 8 - 26 unsupported. */
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8, /* 27: G.711 ALAW */
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};
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static inline unsigned char get_au_bitspersample(unsigned int encoding)
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{
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if (encoding < 8)
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return bitspersamples[encoding];
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else if (encoding == 27)
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return bitspersamples[8];
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return 0;
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}
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bool get_au_metadata(int fd, struct mp3entry* id3)
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{
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/* temporary buffer */
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unsigned char* buf = (unsigned char *)id3->path;
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unsigned long numbytes = 0;
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int offset;
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id3->vbr = false; /* All Sun audio files are CBR */
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id3->filesize = filesize(fd);
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id3->length = 0;
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lseek(fd, 0, SEEK_SET);
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if ((read(fd, buf, 24) < 24) || (memcmp(buf, ".snd", 4) != 0))
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{
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/*
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* no header
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*
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* frequency: 8000 Hz
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* bits per sample: 8 bit
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* channel: mono
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*/
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numbytes = id3->filesize;
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id3->frequency = 8000;
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id3->bitrate = 8;
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}
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else
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{
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/* parse header */
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/* data offset */
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offset = get_long_be(buf + 4);
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if (offset < 24)
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{
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DEBUGF("CODEC_ERROR: sun audio offset size is small: %d\n", offset);
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return false;
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}
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/* data size */
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numbytes = get_long_be(buf + 8);
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if (numbytes == (uint32_t)0xffffffff)
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numbytes = id3->filesize - offset;
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id3->frequency = get_long_be(buf + 16);
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id3->bitrate = get_au_bitspersample(get_long_be(buf + 12)) * get_long_be(buf + 20)
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* id3->frequency / 1000;
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}
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/* Calculate track length [ms] */
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if (id3->bitrate)
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id3->length = (numbytes << 3) / id3->bitrate;
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return true;
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}
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