+++ /dev/null
-
-/*
- * CINELERRA
- * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
-
-#ifndef FOURIER_H
-#define FOURIER_H
-
-
-#include "samples.inc"
-
-#include <stdint.h>
-
-
-class FFT
-{
- static uint8_t rev_bytes[256];
- static unsigned int reverse_bits(unsigned int index, unsigned int bits);
- static void bit_reverse(unsigned int samples,
- double *real_in, double *imag_in,
- double *real_out, double *imag_out);
-public:
- FFT();
- virtual ~FFT();
- // can be in place, but imag_out must exist, imag_in optional
- int do_fft(int samples, // must be a power of 2
- int inverse, // 0 = forward FFT, 1 = inverse
- double *real_in, double *imag_in, // complex input
- double *real_out, double *imag_out); // complex output
- int do_fft(int samples, int inverse, double *real, double *imag) {
- return do_fft(samples, inverse, real, imag, real, imag);
- }
- static unsigned int samples_to_bits(unsigned int samples);
- static int symmetry(int size, double *freq_real, double *freq_imag);
- virtual int update_progress(int current_position);
-};
-
-class CrossfadeFFT : public FFT
-{
-public:
- CrossfadeFFT();
- virtual ~CrossfadeFFT();
-
- int reset();
- int initialize(int window_size);
- long get_delay(); // Number of samples fifo is delayed
- int reconfigure();
- int fix_window_size();
- int delete_fft();
-
-
-// Read enough samples from input to generate the requested number of samples.
-// output_sample - tells it if we've seeked and the output overflow is invalid.
-// return - 0 on success 1 on failure
-// output_sample - start of samples if forward. End of samples if reverse.
-// It's always contiguous.
-// output_ptr - if nonzero, output is put here
-// direction - PLAY_FORWARD or PLAY_REVERSE
- int process_buffer(int64_t output_sample,
- long size,
- Samples *output_ptr,
- int direction);
-
-// Called by process_buffer to read samples from input.
-// Returns 1 on error or 0 on success.
- virtual int read_samples(int64_t output_sample,
- int samples,
- Samples *buffer);
-
-// Process a window in the frequency domain
- virtual int signal_process();
-// Process a window in the time domain after the frequency domain
- virtual int post_process();
-
-// Size of a window. Automatically fixed to a power of 2
- long window_size;
-
-// Frequency domain output of FFT
- double *freq_real;
- double *freq_imag;
-// Time domain output of FFT
- double *output_real;
- double *output_imag;
-
-private:
-
-// input for complete windows
- Samples *input_buffer;
-// output for crossfaded windows with overflow
- double *output_buffer;
-
-// samples in input_buffer
- long input_size;
-// window_size
- long input_allocation;
-// Samples in output buffer less window border
- long output_size;
-// Space in output buffer including window border
- long output_allocation;
-// Starting sample of output buffer in project
- int64_t output_sample;
-// Starting sample of input buffer in project
- int64_t input_sample;
-// Don't crossfade the first window
- int first_window;
-};
-
-#endif
projects / goodguy / history.git / blobdiff