Added test.cpp

src/test.cpp

@@ -0,0 +1,78 @@
+#include <stdio.h>
+#include <cstdint>
+#include <vector>
+
+// For reading FIFO
+#include <fcntl.h>
+#include <unistd.h>
+// Math libs
+#include <math.h>
+#include <fftw3.h>
+
+// Local files
+#include "utility/bitmap.hpp"
+#include "utility/buffer.hpp"
+#include "signal_processing/fft.hpp"
+
+
+// TODO:
+// stereo support (and maybe different bitrates?)
+// Optimization: don't copy filename in buffer?
+// understand consumption rate
+// understand BIN2HZ
+// understand values and sizes (DFT_TOTAL, DFT_NONZERO, etc)
+//   note that wave and spectrum have different sizes
+//
+// MPD interface
+// hid interface to keyboard
+// beat detection
+
+
+
+
+void draw_spectrum_bitmap(
+	const std::vector<size_t>& waveform,
+	Bitmap& bitmap
+) {
+	for (size_t x = 0; x < waveform.size(); x++) {
+		for (size_t y = 0; y < waveform[x]; y++) {
+			bitmap.setpixel(bitmap.get_height() - y - 1, x, 0xFF, 0x00, 0x00);
+		}
+	}
+}
+
+const size_t width = 300;
+const size_t height = 100;
+
+
+int main(int argc, char *argv[]) {
+
+	// buffer size for waveform:
+	// (44100 / fps * 10), make 10 bigger for slower scrolling
+	//
+	// Double both buffer sizes if stereo
+
+	FFT_Visualizer fft = FFT_Visualizer(
+		width, height,
+		20, 20000
+	);
+
+	std::vector<size_t> waveform;
+	waveform.resize(width);
+
+	Buffer buf = Buffer(
+		"/tmp/mpd.fifo",
+		44100 / 2, // Keep 500ms of data in buffer
+		fft.compute_buffer_output_size()
+	);
+
+	Bitmap b = Bitmap(width, height);
+
+	while (1) {
+		b.clear();
+		buf.update();
+		fft.update(buf);
+		draw_spectrum_bitmap(fft.get_output(), b);
+		b.save("/tmp/o.bmp");
+	}
+}