cog/Frameworks/WavPack/Files/unpack3.h

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2013-09-30 19:33:50 +00:00
////////////////////////////////////////////////////////////////////////////
// **** WAVPACK **** //
// Hybrid Lossless Wavefile Compressor //
// Copyright (c) 1998 - 2006 Conifer Software. //
// All Rights Reserved. //
// Distributed under the BSD Software License (see license.txt) //
////////////////////////////////////////////////////////////////////////////
// wavpack3.h
// This header file contains all the additional definitions required for
// decoding old (versions 1, 2 & 3) WavPack files.
typedef struct {
unsigned short FormatTag, NumChannels;
uint32_t SampleRate, BytesPerSecond;
unsigned short BlockAlign, BitsPerSample;
} WaveHeader3;
#define WaveHeader3Format "SSLLSS"
typedef struct {
char ckID [4];
int32_t ckSize;
short version;
short bits; // added for version 2.00
short flags, shift; // added for version 3.00
int32_t total_samples, crc, crc2;
char extension [4], extra_bc, extras [3];
} WavpackHeader3;
#define WavpackHeader3Format "4LSSSSLLL4L"
// these flags added for version 3
#undef MONO_FLAG // these definitions changed for WavPack 4.0
#undef CROSS_DECORR
#undef JOINT_STEREO
#define MONO_FLAG 1 // not stereo
#define FAST_FLAG 2 // non-adaptive predictor and stereo mode
#define RAW_FLAG 4 // raw mode (no .wav header)
#define CALC_NOISE 8 // calc noise in lossy mode (no longer stored)
#define HIGH_FLAG 0x10 // high quality mode (all modes)
#define BYTES_3 0x20 // files have 3-byte samples
#define OVER_20 0x40 // samples are over 20 bits
#define WVC_FLAG 0x80 // create/use .wvc (no longer stored)
#define LOSSY_SHAPE 0x100 // noise shape (lossy mode only)
#define VERY_FAST_FLAG 0x200 // double fast (no longer stored)
#define NEW_HIGH_FLAG 0x400 // new high quality mode (lossless only)
#define CANCEL_EXTREME 0x800 // cancel EXTREME_DECORR
#define CROSS_DECORR 0x1000 // decorrelate chans (with EXTREME_DECORR flag)
#define NEW_DECORR_FLAG 0x2000 // new high-mode decorrelator
#define JOINT_STEREO 0x4000 // joint stereo (lossy and high lossless)
#define EXTREME_DECORR 0x8000 // extra decorrelation (+ enables other flags)
#define STORED_FLAGS 0xfd77 // these are only flags that affect unpacking
#define NOT_STORED_FLAGS (~STORED_FLAGS & 0xffff)
// BitStream stuff (bits.c)
typedef struct bs3 {
void (*wrap)(struct bs3 *bs);
unsigned char *buf, *end, *ptr;
uint32_t bufsiz, fpos, sr;
WavpackStreamReader *reader;
int error, bc;
void *id;
} Bitstream3;
#define K_DEPTH 3
#define MAX_NTERMS3 18
typedef struct {
WavpackHeader3 wphdr;
Bitstream3 wvbits, wvcbits;
uint32_t sample_index;
int num_terms;
#ifndef NO_SEEKING
struct index_point {
char saved;
uint32_t sample_index;
} index_points [256];
unsigned char *unpack_data;
uint32_t unpack_size;
#endif
struct {
int32_t sum_level, left_level, right_level, diff_level;
int last_extra_bits, extra_bits_count, m;
int32_t error [2], crc;
int32_t sample [2] [2];
int weight [2] [1];
} dc;
struct decorr_pass decorr_passes [MAX_NTERMS3];
struct {
unsigned int index [2], k_value [2], ave_k [2];
uint32_t zeros_acc, ave_level [K_DEPTH] [2];
} w1;
struct { int last_dbits [2], last_delta_sign [2], bit_limit; } w2;
struct { int ave_dbits [2], bit_limit; } w3;
struct {
uint32_t fast_level [2], slow_level [2];
int bits_acc [2], bitrate;
} w4;
} WavpackStream3;