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/*
libdemac - A Monkey's Audio decoder
$Id$
Copyright (C) Dave Chapman 2007
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 program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
*/
#ifndef _APE_PARSER_H
#define _APE_PARSER_H
#include <inttypes.h>
#ifdef ROCKBOX
/* Include the Rockbox Codec API when building for Rockbox */
#define APE_OUTPUT_DEPTH 29
#ifndef ROCKBOX_PLUGIN
#include "../lib/codeclib.h"
#include <codecs.h>
#endif
#else
#define APE_OUTPUT_DEPTH (ape_ctx->bps)
#define IBSS_ATTR
#define ICONST_ATTR
#define ICODE_ATTR
#endif
/* The earliest and latest file formats supported by this library */
#define APE_MIN_VERSION 3970
#define APE_MAX_VERSION 3990
#define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]
#define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE]
#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE]
#define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE]
#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level
#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored)
/* Special frame codes:
MONO_SILENCE - All PCM samples in frame are zero (mono streams only)
LEFT_SILENCE - All PCM samples for left channel in frame are zero (stereo streams)
RIGHT_SILENCE - All PCM samples for left channel in frame are zero (stereo streams)
PSEUDO_STEREO - Left and Right channels are identical
*/
#define APE_FRAMECODE_MONO_SILENCE 1
#define APE_FRAMECODE_STEREO_SILENCE 3
#define APE_FRAMECODE_PSEUDO_STEREO 4
#define HISTORY_SIZE 512
#define PREDICTOR_ORDER 8
struct predictor_t
{
/* Adaption co-efficients */
int32_t coeffsA[4];
int32_t coeffsB[5];
/* Filter histories */
int32_t historybuffer[HISTORY_SIZE + PREDICTOR_ORDER * 4];
int32_t* delayA;
int32_t* delayB;
int32_t* adaptcoeffsA;
int32_t* adaptcoeffsB;
int32_t lastA;
int32_t filterA;
int32_t filterB;
};
struct ape_ctx_t
{
/* Derived fields */
uint32_t junklength;
uint32_t firstframe;
uint32_t totalsamples;
/* Info from Descriptor Block */
char magic[4];
int16_t fileversion;
int16_t padding1;
uint32_t descriptorlength;
uint32_t headerlength;
uint32_t seektablelength;
uint32_t wavheaderlength;
uint32_t audiodatalength;
uint32_t audiodatalength_high;
uint32_t wavtaillength;
uint8_t md5[16];
/* Info from Header Block */
uint16_t compressiontype;
uint16_t formatflags;
uint32_t blocksperframe;
uint32_t finalframeblocks;
uint32_t totalframes;
uint16_t bps;
uint16_t channels;
uint32_t samplerate;
/* Seektable */
uint32_t* seektable; /* Seektable buffer */
uint32_t maxseekpoints; /* Max seekpoints we can store (size of seektable buffer) */
uint32_t numseekpoints; /* Number of seekpoints */
int seektablefilepos; /* Location in .ape file of seektable */
/* Decoder state */
uint32_t CRC;
int frameflags;
int currentframeblocks;
int blocksdecoded;
struct predictor_t predictorY;
struct predictor_t predictorX;
};
int ape_parseheader(int fd, struct ape_ctx_t* ape_ctx);
int ape_parseheaderbuf(unsigned char* buf, struct ape_ctx_t* ape_ctx);
void ape_dumpinfo(struct ape_ctx_t* ape_ctx);
#endif
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