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wavpack.h

////////////////////////////////////////////////////////////////////////////
//                           **** WAVPACK ****                            //
//                  Hybrid Lossless Wavefile Compressor                   //
//              Copyright (c) 1998 - 2006 Conifer Software.               //
//                          All Rights Reserved.                          //
//      Distributed under the BSD Software License (see license.txt)      //
////////////////////////////////////////////////////////////////////////////

// wavpack.h

#ifndef WAVPACK_H
#define WAVPACK_H

// This header file contains all the definitions required to use the
// functions in "wputils.c" to read and write WavPack files and streams.

#include <sys/types.h>

#if defined(_WIN32) && !defined(__MINGW32__)
#include <stdlib.h>
typedef unsigned __int64 uint64_t;
typedef unsigned __int32 uint32_t;
typedef unsigned __int16 uint16_t;
typedef unsigned __int8 uint8_t;
typedef __int64 int64_t;
typedef __int32 int32_t;
typedef __int16 int16_t;
typedef __int8  int8_t;
typedef float float32_t;
#else
#include <inttypes.h>
#endif

typedef unsigned char   uchar;

#if !defined(__GNUC__) || defined(WIN32)
typedef unsigned short  ushort;
typedef unsigned int    uint;
#endif

// RIFF / wav header formats (these occur at the beginning of both wav files
// and pre-4.0 WavPack files that are not in the "raw" mode). Generally, an
// application using the library to read or write WavPack files will not be
// concerned with any of these.

typedef struct {
    char ckID [4];
    uint32_t ckSize;
    char formType [4];
} RiffChunkHeader;

typedef struct {
    char ckID [4];
    uint32_t ckSize;
} ChunkHeader;

#define ChunkHeaderFormat "4L"

typedef struct {
    ushort FormatTag, NumChannels;
    uint32_t SampleRate, BytesPerSecond;
    ushort BlockAlign, BitsPerSample;
    ushort cbSize, ValidBitsPerSample;
    int32_t ChannelMask;
    ushort SubFormat;
    char GUID [14];
} WaveHeader;

#define WaveHeaderFormat "SSLLSSSSLS"

// This is the ONLY structure that occurs in WavPack files (as of version
// 4.0), and is the preamble to every block in both the .wv and .wvc
// files (in little-endian format). Normally, this structure has no use
// to an application using the library to read or write WavPack files,
// but if an application needs to manually parse WavPack files then this
// would be used (with appropriate endian correction).

typedef struct {
    char ckID [4];
    uint32_t ckSize;
    short version;
    uchar track_no, index_no;
    uint32_t total_samples, block_index, block_samples, flags, crc;
} WavpackHeader;

#define WavpackHeaderFormat "4LS2LLLLL"

// or-values for WavpackHeader.flags
#define BYTES_STORED    3       // 1-4 bytes/sample
#define MONO_FLAG       4       // not stereo
#define HYBRID_FLAG     8       // hybrid mode
#define JOINT_STEREO    0x10    // joint stereo
#define CROSS_DECORR    0x20    // no-delay cross decorrelation
#define HYBRID_SHAPE    0x40    // noise shape (hybrid mode only)
#define FLOAT_DATA      0x80    // ieee 32-bit floating point data

#define INT32_DATA      0x100   // special extended int handling
#define HYBRID_BITRATE  0x200   // bitrate noise (hybrid mode only)
#define HYBRID_BALANCE  0x400   // balance noise (hybrid stereo mode only)

#define INITIAL_BLOCK   0x800   // initial block of multichannel segment
#define FINAL_BLOCK     0x1000  // final block of multichannel segment

#define SHIFT_LSB       13
#define SHIFT_MASK      (0x1fL << SHIFT_LSB)

#define MAG_LSB         18
#define MAG_MASK        (0x1fL << MAG_LSB)

#define SRATE_LSB       23
#define SRATE_MASK      (0xfL << SRATE_LSB)

#define FALSE_STEREO    0x40000000      // block is stereo, but data is mono

#define IGNORED_FLAGS   0x18000000      // reserved, but ignore if encountered
#define NEW_SHAPING     0x20000000      // use IIR filter for negative shaping
#define UNKNOWN_FLAGS   0x80000000      // also reserved, but refuse decode if
                                        //  encountered

#define MONO_DATA (MONO_FLAG | FALSE_STEREO)

#define MIN_STREAM_VERS     0x402       // lowest stream version we'll decode
#define MAX_STREAM_VERS     0x410       // highest stream version we'll decode or encode
#define CUR_STREAM_VERS     0x405       // stream version we are writing now

// These are the mask bit definitions for the metadata chunk id byte (see format.txt)

#define ID_UNIQUE               0x3f
#define ID_OPTIONAL_DATA        0x20
#define ID_ODD_SIZE             0x40
#define ID_LARGE                0x80

#define ID_DUMMY                0x0
#define ID_ENCODER_INFO         0x1
#define ID_DECORR_TERMS         0x2
#define ID_DECORR_WEIGHTS       0x3
#define ID_DECORR_SAMPLES       0x4
#define ID_ENTROPY_VARS         0x5
#define ID_HYBRID_PROFILE       0x6
#define ID_SHAPING_WEIGHTS      0x7
#define ID_FLOAT_INFO           0x8
#define ID_INT32_INFO           0x9
#define ID_WV_BITSTREAM         0xa
#define ID_WVC_BITSTREAM        0xb
#define ID_WVX_BITSTREAM        0xc
#define ID_CHANNEL_INFO         0xd

#define ID_RIFF_HEADER          (ID_OPTIONAL_DATA | 0x1)
#define ID_RIFF_TRAILER         (ID_OPTIONAL_DATA | 0x2)
#define ID_REPLAY_GAIN          (ID_OPTIONAL_DATA | 0x3)    // never used (APEv2)
#define ID_CUESHEET             (ID_OPTIONAL_DATA | 0x4)    // never used (APEv2)
#define ID_CONFIG_BLOCK         (ID_OPTIONAL_DATA | 0x5)
#define ID_MD5_CHECKSUM         (ID_OPTIONAL_DATA | 0x6)
#define ID_SAMPLE_RATE          (ID_OPTIONAL_DATA | 0x7)

///////////////////////// WavPack Configuration ///////////////////////////////

// This external structure is used during encode to provide configuration to
// the encoding engine and during decoding to provide fle information back to
// the higher level functions. Not all fields are used in both modes.

typedef struct {
    float bitrate, shaping_weight;
    int bits_per_sample, bytes_per_sample;
    int qmode, flags, xmode, num_channels, float_norm_exp;
    int32_t block_samples, extra_flags, sample_rate, channel_mask;
    uchar md5_checksum [16], md5_read;
    int num_tag_strings;
    char **tag_strings;
} WavpackConfig;

#define CONFIG_HYBRID_FLAG      8       // hybrid mode
#define CONFIG_JOINT_STEREO     0x10    // joint stereo
#define CONFIG_HYBRID_SHAPE     0x40    // noise shape (hybrid mode only)
#define CONFIG_FAST_FLAG        0x200   // fast mode
#define CONFIG_HIGH_FLAG        0x800   // high quality mode
#define CONFIG_VERY_HIGH_FLAG   0x1000  // very high
#define CONFIG_BITRATE_KBPS     0x2000  // bitrate is kbps, not bits / sample
#define CONFIG_SHAPE_OVERRIDE   0x8000  // shaping mode specified
#define CONFIG_JOINT_OVERRIDE   0x10000 // joint-stereo mode specified
#define CONFIG_CREATE_EXE       0x40000 // create executable
#define CONFIG_CREATE_WVC       0x80000 // create correction file
#define CONFIG_OPTIMIZE_WVC     0x100000 // maximize bybrid compression
#define CONFIG_CALC_NOISE       0x800000 // calc noise in hybrid mode
#define CONFIG_EXTRA_MODE       0x2000000 // extra processing mode
#define CONFIG_SKIP_WVX         0x4000000 // no wvx stream w/ floats & big ints
#define CONFIG_MD5_CHECKSUM     0x8000000 // store MD5 signature
#define CONFIG_OPTIMIZE_MONO    0x80000000 // optimize for mono streams posing as stereo

////////////// Callbacks used for reading & writing WavPack streams //////////

typedef struct {
    int32_t (*read_bytes)(void *id, void *data, int32_t bcount);
    uint32_t (*get_pos)(void *id);
    int (*set_pos_abs)(void *id, uint32_t pos);
    int (*set_pos_rel)(void *id, int32_t delta, int mode);
    int (*push_back_byte)(void *id, int c);
    uint32_t (*get_length)(void *id);
    int (*can_seek)(void *id);

    // this callback is for writing edited tags only
    int32_t (*write_bytes)(void *id, void *data, int32_t bcount);
} WavpackStreamReader;

typedef int (*WavpackBlockOutput)(void *id, void *data, int32_t bcount);

//////////////////////////// function prototypes /////////////////////////////

// Note: See wputils.c sourcecode for descriptions for using these functions.

typedef void WavpackContext;

#ifdef __cplusplus
extern "C" {
#endif

WavpackContext *WavpackOpenFileInputEx (WavpackStreamReader *reader, void *wv_id, void *wvc_id, char *error, int flags, int norm_offset);
WavpackContext *WavpackOpenFileInput (const char *infilename, char *error, int flags, int norm_offset);

#define OPEN_WVC        0x1     // open/read "correction" file
#define OPEN_TAGS       0x2     // read ID3v1 / APEv2 tags (seekable file)
#define OPEN_WRAPPER    0x4     // make audio wrapper available (i.e. RIFF)
#define OPEN_2CH_MAX    0x8     // open multichannel as stereo (no downmix)
#define OPEN_NORMALIZE  0x10    // normalize floating point data to +/- 1.0
#define OPEN_STREAMING  0x20    // "streaming" mode blindly unpacks blocks
                                // w/o regard to header file position info
#define OPEN_EDIT_TAGS  0x40    // allow editing of tags

int WavpackGetMode (WavpackContext *wpc);

#define MODE_WVC        0x1
#define MODE_LOSSLESS   0x2
#define MODE_HYBRID     0x4
#define MODE_FLOAT      0x8
#define MODE_VALID_TAG  0x10
#define MODE_HIGH       0x20
#define MODE_FAST       0x40
#define MODE_EXTRA      0x80
#define MODE_APETAG     0x100
#define MODE_SFX        0x200
#define MODE_VERY_HIGH  0x400
#define MODE_MD5        0x800

char *WavpackGetErrorMessage (WavpackContext *wpc);
int WavpackGetVersion (WavpackContext *wpc);
uint32_t WavpackUnpackSamples (WavpackContext *wpc, int32_t *buffer, uint32_t samples);
uint32_t WavpackGetNumSamples (WavpackContext *wpc);
uint32_t WavpackGetSampleIndex (WavpackContext *wpc);
int WavpackGetNumErrors (WavpackContext *wpc);
int WavpackLossyBlocks (WavpackContext *wpc);
int WavpackSeekSample (WavpackContext *wpc, uint32_t sample);
WavpackContext *WavpackCloseFile (WavpackContext *wpc);
uint32_t WavpackGetSampleRate (WavpackContext *wpc);
int WavpackGetBitsPerSample (WavpackContext *wpc);
int WavpackGetBytesPerSample (WavpackContext *wpc);
int WavpackGetNumChannels (WavpackContext *wpc);
int WavpackGetChannelMask (WavpackContext *wpc);
int WavpackGetReducedChannels (WavpackContext *wpc);
int WavpackGetFloatNormExp (WavpackContext *wpc);
int WavpackGetMD5Sum (WavpackContext *wpc, uchar data [16]);
uint32_t WavpackGetWrapperBytes (WavpackContext *wpc);
uchar *WavpackGetWrapperData (WavpackContext *wpc);
void WavpackFreeWrapper (WavpackContext *wpc);
void WavpackSeekTrailingWrapper (WavpackContext *wpc);
double WavpackGetProgress (WavpackContext *wpc);
uint32_t WavpackGetFileSize (WavpackContext *wpc);
double WavpackGetRatio (WavpackContext *wpc);
double WavpackGetAverageBitrate (WavpackContext *wpc, int count_wvc);
double WavpackGetInstantBitrate (WavpackContext *wpc);
int WavpackGetNumTagItems (WavpackContext *wpc);
int WavpackGetTagItem (WavpackContext *wpc, const char *item, char *value, int size);
int WavpackGetTagItemIndexed (WavpackContext *wpc, int index, char *item, int size);
int WavpackAppendTagItem (WavpackContext *wpc, const char *item, const char *value, int vsize);
int WavpackDeleteTagItem (WavpackContext *wpc, const char *item);
int WavpackWriteTag (WavpackContext *wpc);

WavpackContext *WavpackOpenFileOutput (WavpackBlockOutput blockout, void *wv_id, void *wvc_id);
int WavpackSetConfiguration (WavpackContext *wpc, WavpackConfig *config, uint32_t total_samples);
int WavpackAddWrapper (WavpackContext *wpc, void *data, uint32_t bcount);
int WavpackStoreMD5Sum (WavpackContext *wpc, uchar data [16]);
int WavpackPackInit (WavpackContext *wpc);
int WavpackPackSamples (WavpackContext *wpc, int32_t *sample_buffer, uint32_t sample_count);
int WavpackFlushSamples (WavpackContext *wpc);
void WavpackUpdateNumSamples (WavpackContext *wpc, void *first_block);
void *WavpackGetWrapperLocation (void *first_block, uint32_t *size);
double WavpackGetEncodedNoise (WavpackContext *wpc, double *peak);

void WavpackFloatNormalize (int32_t *values, int32_t num_values, int delta_exp);

void WavpackLittleEndianToNative (void *data, char *format);
void WavpackNativeToLittleEndian (void *data, char *format);

uint32_t WavpackGetLibraryVersion ();
const char *WavpackGetLibraryVersionString ();

#ifdef __cplusplus
}
#endif

#endif

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