114 lines
3.6 KiB
C
114 lines
3.6 KiB
C
////////////////////////////////////////////////////////////////////////////
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// **** WAVPACK **** //
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// Hybrid Lossless Wavefile Compressor //
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// Copyright (c) 1998 - 2005 Conifer Software. //
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// All Rights Reserved. //
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// Distributed under the BSD Software License (see license.txt) //
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////////////////////////////////////////////////////////////////////////////
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// wavpack3.h
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// This header file contains all the additional definitions required for
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// decoding old (versions 1, 2 & 3) WavPack files.
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typedef struct {
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ushort FormatTag, NumChannels;
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uint32_t SampleRate, BytesPerSecond;
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ushort BlockAlign, BitsPerSample;
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} WaveHeader3;
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#define WaveHeader3Format "SSLLSS"
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typedef struct {
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char ckID [4];
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int32_t ckSize;
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short version;
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short bits; // added for version 2.00
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short flags, shift; // added for version 3.00
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int32_t total_samples, crc, crc2;
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char extension [4], extra_bc, extras [3];
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} WavpackHeader3;
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#define WavpackHeader3Format "4LSSSSLLL4L"
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// these flags added for version 3
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#undef MONO_FLAG // these definitions changed for WavPack 4.0
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#undef CROSS_DECORR
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#undef JOINT_STEREO
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#define MONO_FLAG 1 // not stereo
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#define FAST_FLAG 2 // non-adaptive predictor and stereo mode
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#define RAW_FLAG 4 // raw mode (no .wav header)
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#define CALC_NOISE 8 // calc noise in lossy mode (no longer stored)
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#define HIGH_FLAG 0x10 // high quality mode (all modes)
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#define BYTES_3 0x20 // files have 3-byte samples
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#define OVER_20 0x40 // samples are over 20 bits
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#define WVC_FLAG 0x80 // create/use .wvc (no longer stored)
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#define LOSSY_SHAPE 0x100 // noise shape (lossy mode only)
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#define VERY_FAST_FLAG 0x200 // double fast (no longer stored)
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#define NEW_HIGH_FLAG 0x400 // new high quality mode (lossless only)
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#define CANCEL_EXTREME 0x800 // cancel EXTREME_DECORR
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#define CROSS_DECORR 0x1000 // decorrelate chans (with EXTREME_DECORR flag)
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#define NEW_DECORR_FLAG 0x2000 // new high-mode decorrelator
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#define JOINT_STEREO 0x4000 // joint stereo (lossy and high lossless)
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#define EXTREME_DECORR 0x8000 // extra decorrelation (+ enables other flags)
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#define STORED_FLAGS 0xfd77 // these are only flags that affect unpacking
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#define NOT_STORED_FLAGS (~STORED_FLAGS & 0xffff)
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// BitStream stuff (bits.c)
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typedef struct bs3 {
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void (*wrap)(struct bs3 *bs);
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uchar *buf, *end, *ptr;
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uint32_t bufsiz, fpos, sr;
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WavpackStreamReader *reader;
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int error, bc;
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void *id;
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} Bitstream3;
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#define K_DEPTH 3
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#define MAX_NTERMS3 18
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typedef struct {
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WavpackHeader3 wphdr;
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Bitstream3 wvbits, wvcbits;
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uint32_t sample_index;
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int num_terms;
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#ifdef SEEKING
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struct index_point {
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char saved;
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uint32_t sample_index;
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} index_points [256];
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uchar *unpack_data;
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uint32_t unpack_size;
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#endif
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struct {
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int32_t sum_level, left_level, right_level, diff_level;
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int last_extra_bits, extra_bits_count, m;
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int32_t error [2], crc;
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int32_t sample [2] [2];
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int weight [2] [1];
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} dc;
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struct decorr_pass decorr_passes [MAX_NTERMS3];
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struct {
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uint index [2], k_value [2], ave_k [2];
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uint32_t zeros_acc, ave_level [K_DEPTH] [2];
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} w1;
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struct { int last_dbits [2], last_delta_sign [2], bit_limit; } w2;
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struct { int ave_dbits [2], bit_limit; } w3;
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struct {
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uint32_t fast_level [2], slow_level [2];
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int bits_acc [2], bitrate;
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} w4;
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} WavpackStream3;
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