101 lines
3 KiB
C
101 lines
3 KiB
C
|
/**
|
||
|
|
* PANDA 3D SOFTWARE
|
||
|
|
* Copyright (c) Carnegie Mellon University. All rights reserved.
|
||
|
|
*
|
||
|
|
* All use of this software is subject to the terms of the revised BSD
|
||
|
|
* license. You should have received a copy of this license along
|
||
|
|
* with this source code in a file named "LICENSE."
|
||
|
|
*
|
||
|
|
* @file fftCompressor.h
|
||
|
|
* @author drose
|
||
|
|
* @date 2000-12-11
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef FFTCOMPRESSOR_H
|
||
|
|
#define FFTCOMPRESSOR_H
|
||
|
|
|
||
|
|
#include "pandabase.h"
|
||
|
|
|
||
|
|
#include "pvector.h"
|
||
|
|
#include "pointerToArray.h"
|
||
|
|
#include "vector_stdfloat.h"
|
||
|
|
#include "vector_double.h"
|
||
|
|
#include "luse.h"
|
||
|
|
|
||
|
|
class Datagram;
|
||
|
|
class DatagramIterator;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* This class manages a lossy compression and decompression of a stream of
|
||
|
|
* floating-point numbers to a datagram, based a fourier transform algorithm
|
||
|
|
* (similar in principle to JPEG compression).
|
||
|
|
*
|
||
|
|
* Actually, it doesn't do any real compression on its own; it just outputs a
|
||
|
|
* stream of integers that should compress much tighter via gzip than the
|
||
|
|
* original stream of floats would have.
|
||
|
|
*
|
||
|
|
* This class depends on the external FFTW library; without it, it will fall
|
||
|
|
* back on lossless output of the original data.
|
||
|
|
*/
|
||
|
|
class EXPCL_PANDA_MATHUTIL FFTCompressor {
|
||
|
|
public:
|
||
|
|
FFTCompressor();
|
||
|
|
|
||
|
|
static bool is_compression_available();
|
||
|
|
|
||
|
|
void set_quality(int quality);
|
||
|
|
int get_quality() const;
|
||
|
|
|
||
|
|
void set_use_error_threshold(bool use_error_threshold);
|
||
|
|
bool get_use_error_threshold() const;
|
||
|
|
|
||
|
|
void set_transpose_quats(bool flag);
|
||
|
|
bool get_transpose_quats() const;
|
||
|
|
|
||
|
|
void write_header(Datagram &datagram);
|
||
|
|
void write_reals(Datagram &datagram, const PN_stdfloat *array, int length);
|
||
|
|
void write_hprs(Datagram &datagram, const LVecBase3 *array, int length);
|
||
|
|
|
||
|
|
bool read_header(DatagramIterator &di, int bam_minor_version);
|
||
|
|
bool read_reals(DatagramIterator &di, vector_stdfloat &array);
|
||
|
|
bool read_hprs(DatagramIterator &di, pvector<LVecBase3> &array,
|
||
|
|
bool new_hpr);
|
||
|
|
bool read_hprs(DatagramIterator &di, pvector<LVecBase3> &array);
|
||
|
|
|
||
|
|
static void free_storage();
|
||
|
|
|
||
|
|
private:
|
||
|
|
enum RunWidth {
|
||
|
|
// We write a byte to the datagram at the beginning of each run to encode
|
||
|
|
// the width and length of the run. The width is indicated by the top two
|
||
|
|
// bits, while the length fits in the lower six, except RW_double, which
|
||
|
|
// is a special case.
|
||
|
|
RW_width_mask = 0xc0,
|
||
|
|
RW_length_mask = 0x3f,
|
||
|
|
RW_0 = 0x00,
|
||
|
|
RW_8 = 0x40,
|
||
|
|
RW_16 = 0x80,
|
||
|
|
RW_32 = 0xc0,
|
||
|
|
RW_double = 0xff,
|
||
|
|
RW_invalid = 0x01
|
||
|
|
};
|
||
|
|
|
||
|
|
int write_run(Datagram &datagram, RunWidth run_width,
|
||
|
|
const vector_double &run);
|
||
|
|
int read_run(DatagramIterator &di, vector_double &run);
|
||
|
|
double get_scale_factor(int i, int length) const;
|
||
|
|
static double interpolate(double t, double a, double b);
|
||
|
|
|
||
|
|
PN_stdfloat get_compressability(const PN_stdfloat *data, int length) const;
|
||
|
|
|
||
|
|
int _bam_minor_version;
|
||
|
|
int _quality;
|
||
|
|
bool _use_error_threshold;
|
||
|
|
double _fft_offset;
|
||
|
|
double _fft_factor;
|
||
|
|
double _fft_exponent;
|
||
|
|
bool _transpose_quats;
|
||
|
|
};
|
||
|
|
|
||
|
|
#endif
|