update example.c and add panning example

1 files changed, 41 insertions, 0 deletions

diff --git a/examples/panning.c b/examples/panning.c
new file mode 100644
index 0000000..7ee9a76
--- /dev/null
+++ b/examples/panning.c
@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <math.h>
+#include <mossrose.h>
+#include <portaudio.h>
+
+#define PI 3.14159
+
+
+#define SAMPLE_RATE 44100
+#define N_CHANNELS 8
+
+int main()
+{
+	float sine_wave[8*SAMPLE_RATE];
+	const int frequency = 440;
+	for (long i=0; i<8*SAMPLE_RATE; i++) {
+		float time = ((float)i)/SAMPLE_RATE;
+		sine_wave[i] = sin(2*PI*frequency*time);
+	}
+
+	struct mossrose_sound_t sound = {
+		.left = sine_wave, .right = NULL, .mono = true, .len = 8*SAMPLE_RATE
+	};
+
+	int err = mossrose_init(SAMPLE_RATE, N_CHANNELS, true);
+	if (err != 0)
+		fprintf(stderr, "FAILED TO INITIALIZE MOSSROSE\n");
+
+	Pa_Sleep(500);
+
+	int chan = mossrose_play(&sound, -1);
+
+	for (int i=0; i<800; i++) {
+		float time = ((float)i)/100;
+		mossrose_channel_set_pan(chan, cos(2*PI*time), 0);
+		Pa_Sleep(10);
+	}
+
+	mossrose_terminate();
+	return 0;
+}