cadb3627fc
librbcodec users must provide these two files when the library is built. rbcodecconfig.h provides configuration #defines and basic types, and will be included by public librbcodec headers, so it must not conflict with the user's code. rbcodecplatform.h provides various OS functions, and will only be included by source files and private headers. This system is intended to provide maximum flexibility for use on embedded systems, where no operating system headers are included. Unix systems can just copy rbcodecconfig-example.h and rbcodecplatform-unix.h with minimal changes. Change-Id: I350a2274d173da391fd1ca00c4202e9760d91def Reviewed-on: http://gerrit.rockbox.org/143 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
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 "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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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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