avolkov
c18134d041
git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@3596 8092fc87-c524-0410-9efc-e669fe64eaf9
100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
/*
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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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*
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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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*
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* ABX format encoder/decoder */
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#ifndef ABX_H_INCL
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#define ABX_H_INCL
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#include <stdint.h>
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#include "port.h"
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typedef struct
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{
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uint16_t numFrames; // Number of frames in this file
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uint32_t totalSize; // Total size of uncompressed data
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uint16_t maxBufSize; // Maximum buffer needed for decoded samples
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uint16_t freq; // Base sampling frequency
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} abx_FileHeader;
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typedef struct
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{
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uint32_t ofs; // File offset of frame data
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uint16_t fsize; // Compressed frame size (in file)
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uint16_t usize; // Uncompressed data size
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} abx_FrameInfo;
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typedef struct
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{
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uint16_t usize; // Uncompressed data size
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uint16_t freq; // Sampling frequency
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uint8_t blockSize; // Block size picked by encoder; power of 2 and minimum 8
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uint8_t minSquelch; // INFO: Minimum repeat count for squelching
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uint16_t maxError; // INFO: Maximum total error squared per block
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} abx_FrameHeader;
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#define SQLCH 0x40 // Squelch byte flag
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#define RESYNC 0x80 // Resync byte flag.
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#define DELTAMOD 0x30 // Delta modulation bits.
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#define DELTASHIFT 4 // Delta modulation bits.
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#define ONEBIT 0x10 // One bit delta modulate
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#define TWOBIT 0x20 // Two bit delta modulate
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#define FOURBIT 0x30 // four bit delta modulate
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#define MULTIPLIER 0x0F // Bottom nibble contains multiplier value.
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#define SQUELCHCNT 0x3F // Bits for squelching.
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#define ABX_DEFAULT_FREQ 11025
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#define ABX_DEFAULT_ERROR 32
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#define ABX_DEFAULT_SQUELCH 2
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#define ABX_DEFAULT_BLOCKSIZE 32
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typedef struct
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{
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// read-only
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int last_error;
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unsigned numFrames;
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uint16_t freq;
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// internal
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bool writing;
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FILE *fp;
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abx_FrameInfo *frames;
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unsigned nextFrame;
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unsigned maxFrames;
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uint32_t frames_ofs;
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uint32_t data_ofs;
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uint32_t totalSize;
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int maxError;
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unsigned maxBufSize;
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unsigned maxEncSize;
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uint8_t *buf;
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} abx_File;
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bool abx_open(abx_File *abx, const char *filename);
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bool abx_create(abx_File *abx, const char *filename);
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void abx_close(abx_File *abx);
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bool abx_setSamplingRate(abx_File *abx, uint32_t freq);
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bool abx_setMaxFrames(abx_File *abx, unsigned maxFrames);
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uint32_t abx_getMaxBuffer(abx_File *abx);
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uint32_t abx_readFrame(abx_File *abx, void *buf, uint32_t bufsize);
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uint32_t abx_writeFrame(abx_File *abx, void *buf, uint32_t bufsize);
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#endif /* ABX_H_INCL */
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