/* 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 #include "demac_config.h" /* 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_LEFT_SILENCE 1 /* same as mono */ #define APE_FRAMECODE_RIGHT_SILENCE 2 #define APE_FRAMECODE_STEREO_SILENCE 3 /* combined */ #define APE_FRAMECODE_PSEUDO_STEREO 4 #define PREDICTOR_ORDER 8 /* Total size of all predictor histories - 50 * sizeof(int32_t) */ #define PREDICTOR_SIZE 50 /* NOTE: This struct is used in predictor-arm.S - any updates need to be reflected there. */ struct predictor_t { /* Filter histories */ int32_t* buf; int32_t YlastA; int32_t XlastA; /* NOTE: The order of the next four fields is important for predictor-arm.S */ int32_t YfilterB; int32_t XfilterA; int32_t XfilterB; int32_t YfilterA; /* Adaption co-efficients */ int32_t YcoeffsA[4]; int32_t XcoeffsA[4]; int32_t YcoeffsB[5]; int32_t XcoeffsB[5]; int32_t historybuffer[PREDICTOR_HISTORY_SIZE + PREDICTOR_SIZE]; }; 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 predictor; }; 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