f40bfc9267
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97 Reviewed-on: http://gerrit.rockbox.org/137 Reviewed-by: Nils Wallménius <nils@rockbox.org> Tested-by: Nils Wallménius <nils@rockbox.org>
137 lines
4.2 KiB
C
137 lines
4.2 KiB
C
/*
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libdemac - A Monkey's Audio decoder
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$Id$
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Copyright (C) Dave Chapman 2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110, USA
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*/
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#ifndef _APE_PARSER_H
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#define _APE_PARSER_H
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#include <inttypes.h>
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#include "demac_config.h"
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/* The earliest and latest file formats supported by this library */
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#define APE_MIN_VERSION 3970
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#define APE_MAX_VERSION 3990
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#define MAC_FORMAT_FLAG_8_BIT 1 // is 8-bit [OBSOLETE]
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#define MAC_FORMAT_FLAG_CRC 2 // uses the new CRC32 error detection [OBSOLETE]
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#define MAC_FORMAT_FLAG_HAS_PEAK_LEVEL 4 // uint32 nPeakLevel after the header [OBSOLETE]
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#define MAC_FORMAT_FLAG_24_BIT 8 // is 24-bit [OBSOLETE]
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#define MAC_FORMAT_FLAG_HAS_SEEK_ELEMENTS 16 // has the number of seek elements after the peak level
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#define MAC_FORMAT_FLAG_CREATE_WAV_HEADER 32 // create the wave header on decompression (not stored)
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/* Special frame codes:
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MONO_SILENCE - All PCM samples in frame are zero (mono streams only)
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LEFT_SILENCE - All PCM samples for left channel in frame are zero (stereo streams)
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RIGHT_SILENCE - All PCM samples for left channel in frame are zero (stereo streams)
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PSEUDO_STEREO - Left and Right channels are identical
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*/
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#define APE_FRAMECODE_MONO_SILENCE 1
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#define APE_FRAMECODE_LEFT_SILENCE 1 /* same as mono */
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#define APE_FRAMECODE_RIGHT_SILENCE 2
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#define APE_FRAMECODE_STEREO_SILENCE 3 /* combined */
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#define APE_FRAMECODE_PSEUDO_STEREO 4
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#define PREDICTOR_ORDER 8
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/* Total size of all predictor histories - 50 * sizeof(int32_t) */
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#define PREDICTOR_SIZE 50
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/* NOTE: This struct is used in predictor-arm.S - any updates need to
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be reflected there. */
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struct predictor_t
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{
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/* Filter histories */
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int32_t* buf;
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int32_t YlastA;
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int32_t XlastA;
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/* NOTE: The order of the next four fields is important for
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predictor-arm.S */
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int32_t YfilterB;
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int32_t XfilterA;
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int32_t XfilterB;
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int32_t YfilterA;
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/* Adaption co-efficients */
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int32_t YcoeffsA[4];
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int32_t XcoeffsA[4];
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int32_t YcoeffsB[5];
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int32_t XcoeffsB[5];
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int32_t historybuffer[PREDICTOR_HISTORY_SIZE + PREDICTOR_SIZE];
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};
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struct ape_ctx_t
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{
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/* Derived fields */
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uint32_t junklength;
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uint32_t firstframe;
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uint32_t totalsamples;
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/* Info from Descriptor Block */
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char magic[4];
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int16_t fileversion;
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int16_t padding1;
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uint32_t descriptorlength;
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uint32_t headerlength;
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uint32_t seektablelength;
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uint32_t wavheaderlength;
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uint32_t audiodatalength;
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uint32_t audiodatalength_high;
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uint32_t wavtaillength;
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uint8_t md5[16];
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/* Info from Header Block */
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uint16_t compressiontype;
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uint16_t formatflags;
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uint32_t blocksperframe;
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uint32_t finalframeblocks;
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uint32_t totalframes;
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uint16_t bps;
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uint16_t channels;
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uint32_t samplerate;
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/* Seektable */
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uint32_t* seektable; /* Seektable buffer */
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uint32_t maxseekpoints; /* Max seekpoints we can store (size of seektable buffer) */
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uint32_t numseekpoints; /* Number of seekpoints */
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int seektablefilepos; /* Location in .ape file of seektable */
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/* Decoder state */
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uint32_t CRC;
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int frameflags;
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int currentframeblocks;
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int blocksdecoded;
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struct predictor_t predictor;
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};
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int ape_parseheader(int fd, struct ape_ctx_t* ape_ctx);
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int ape_parseheaderbuf(unsigned char* buf, struct ape_ctx_t* ape_ctx);
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void ape_dumpinfo(struct ape_ctx_t* ape_ctx);
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#endif
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