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141 lines
3.9 KiB
C
141 lines
3.9 KiB
C
/*
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* ttadec.h
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*
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* Description: TTAv1 decoder definitions and prototypes
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* Developed by: Alexander Djourik <sasha@iszf.irk.ru>
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* Pavel Zhilin <pzh@iszf.irk.ru>
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*
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* Copyright (c) 1999-2004 Alexander Djourik. All rights reserved.
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*
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*/
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/*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; 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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* Please see the file COPYING in this directory for full copyright
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* information.
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*/
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#ifndef TTADEC_H_
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#define TTADEC_H_
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#ifdef _WIN32
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#pragma pack(1)
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#define __ATTRIBUTE_PACKED__
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#else
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#define __ATTRIBUTE_PACKED__ __attribute__((packed))
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#endif
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#define TTA1_SIGN 0x31415454
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#define FRAME_TIME 1.04489795918367346939
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#define MAX_ORDER 8
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#ifndef WAVE_FORMAT_PCM
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#define WAVE_FORMAT_PCM 1
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#endif
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#ifdef _WIN32
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typedef unsigned __int64 uint64;
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#else
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typedef unsigned long long uint64;
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#endif
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/**
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* moved to gstttadec.c to silence gcc warnings
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*/
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/*
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static const unsigned long bit_mask[] = {
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0x00000000, 0x00000001, 0x00000003, 0x00000007,
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0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f,
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0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff,
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0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff,
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0x0000ffff, 0x0001ffff, 0x0003ffff, 0x0007ffff,
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0x000fffff, 0x001fffff, 0x003fffff, 0x007fffff,
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0x00ffffff, 0x01ffffff, 0x03ffffff, 0x07ffffff,
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0x0fffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff,
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0xffffffff
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};
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static const unsigned long bit_shift[] = {
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0x00000001, 0x00000002, 0x00000004, 0x00000008,
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0x00000010, 0x00000020, 0x00000040, 0x00000080,
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0x00000100, 0x00000200, 0x00000400, 0x00000800,
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0x00001000, 0x00002000, 0x00004000, 0x00008000,
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0x00010000, 0x00020000, 0x00040000, 0x00080000,
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0x00100000, 0x00200000, 0x00400000, 0x00800000,
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0x01000000, 0x02000000, 0x04000000, 0x08000000,
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0x10000000, 0x20000000, 0x40000000, 0x80000000,
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0x80000000, 0x80000000, 0x80000000, 0x80000000,
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0x80000000, 0x80000000, 0x80000000, 0x80000000
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};
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static const unsigned long *shift_16 = bit_shift + 4;
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*/
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typedef unsigned char byte;
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#ifdef _BIG_ENDIAN
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#define ENDSWAP_INT16(x) (((((x)>>8)&0xFF)|(((x)&0xFF)<<8)))
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#define ENDSWAP_INT32(x) (((((x)>>24)&0xFF)|(((x)>>8)&0xFF00)|(((x)&0xFF00)<<8)|(((x)&0xFF)<<24)))
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#define WRITE_BUFFER(x, bsize, out) { \
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if (bsize > 2) *out++ = (byte)(*x >> 16); \
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if (bsize > 1) *out++ = (byte)(*x >> 8); \
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*out++ = (byte) *x; }
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#else
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#define ENDSWAP_INT16(x) (x)
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#define ENDSWAP_INT32(x) (x)
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#define WRITE_BUFFER(x, bsize, out) { \
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*out++ = (byte) *x; \
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if (bsize > 1) *out++ = (byte)(*x >> 8); \
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if (bsize > 2) *out++ = (byte)(*x >> 16); }
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#endif
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#define PREDICTOR1(x, k) ((long)((((uint64)x << k) - x) >> k))
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#define DEC(x) (((x)&1)?(++(x)>>1):(-(x)>>1))
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typedef struct {
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unsigned long TTAid;
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unsigned short AudioFormat;
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unsigned short NumChannels;
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unsigned short BitsPerSample;
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unsigned long SampleRate;
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unsigned long DataLength;
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unsigned long CRC32;
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} __ATTRIBUTE_PACKED__ tta_hdr;
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typedef struct {
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unsigned long k0;
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unsigned long k1;
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unsigned long sum0;
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unsigned long sum1;
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} adapt;
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typedef struct {
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long shift;
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long round;
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long error;
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long mutex;
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long qm[MAX_ORDER+1];
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long dx[MAX_ORDER+1];
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long dl[MAX_ORDER+1];
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} fltst;
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typedef struct {
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fltst fst;
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adapt rice;
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long last;
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} decoder;
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#endif /* TTADEC_H_ */
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