update example.c and add panning example

3 files changed, 60 insertions, 4 deletions

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 49dd924..46e02d4 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -3,3 +3,8 @@ project(mossrose)
 add_executable(example ${CMAKE_CURRENT_LIST_DIR}/example.c)
 target_link_libraries(example mossrose)
 add_dependencies(examples example)
+
+
+add_executable(panning ${CMAKE_CURRENT_LIST_DIR}/panning.c)
+target_link_libraries(panning mossrose)
+add_dependencies(examples panning)
diff --git a/examples/example.c b/examples/example.c
index 9ae3acc..5e65d82 100644
--- a/examples/example.c
+++ b/examples/example.c
@@ -20,22 +20,32 @@ int main()
 		sin1[i] = sin(2*PI*f1*time);
 		sin2[i] = sin(2*PI*f2*time);
 	}
-	mossrose_init(SAMPLE_RATE, N_CHANNELS);
+
+	struct mossrose_sound_t sound_440 = {
+		.left = sin1, .right = NULL, .mono = true, .len = SAMPLE_RATE
+	};
+	struct mossrose_sound_t sound_512 = {
+		.left = sin2, .right = NULL, .mono = true, .len = SAMPLE_RATE
+	};
+
+	int err = mossrose_init(SAMPLE_RATE, N_CHANNELS, true);
+	if (err != 0)
+		fprintf(stderr, "FAILED TO INITIALIZE MOSSROSE\n");
 
 	Pa_Sleep(500);
 
 	printf("play 1\n");
-	mossrose_play(sin1, NULL, SAMPLE_RATE, -1);
+	mossrose_play(&sound_512, -1);
 	printf("wait\n");
 	Pa_Sleep(1000);
 
 	printf("play 2\n");
-	mossrose_play(sin2, NULL, SAMPLE_RATE, -1);
+	mossrose_play(&sound_440, -1);
 	printf("wait\n");
 	Pa_Sleep(500);
 
 	printf("play 3\n");
-	mossrose_play(NULL, sin1, SAMPLE_RATE, -1);
+	mossrose_play(&sound_512, -1);
 	printf("wait\n");
 	Pa_Sleep(1000);
 
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;
+}