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Diffstat (limited to 'apps/codecs/demac/libdemac/parser.h')
| -rw-r--r-- | apps/codecs/demac/libdemac/parser.h | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/apps/codecs/demac/libdemac/parser.h b/apps/codecs/demac/libdemac/parser.h new file mode 100644 index 0000000000..edf4222fd5 --- /dev/null +++ b/apps/codecs/demac/libdemac/parser.h @@ -0,0 +1,137 @@ +/* + +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; + + /* 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 |