From 63db9380f84cb3eb35d2de430b0783afa5773e85 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Sun, 4 Sep 2022 00:39:24 -0500
Subject: implement callbacks

---
 examples/CMakeLists.txt |  5 +++++
 examples/callback.c     | 55 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+)
 create mode 100644 examples/callback.c

(limited to 'examples')

diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt
index 7fe2030..aea5060 100644
--- a/examples/CMakeLists.txt
+++ b/examples/CMakeLists.txt
@@ -13,3 +13,8 @@ add_dependencies(examples panning)
 add_executable(loop ${CMAKE_CURRENT_LIST_DIR}/loop.c)
 target_link_libraries(loop mossrose)
 add_dependencies(examples loop)
+
+
+add_executable(callback ${CMAKE_CURRENT_LIST_DIR}/callback.c)
+target_link_libraries(callback mossrose)
+add_dependencies(examples callback)
diff --git a/examples/callback.c b/examples/callback.c
new file mode 100644
index 0000000..bf7e187
--- /dev/null
+++ b/examples/callback.c
@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include <math.h>
+#include <mossrose.h>
+#include <portaudio.h>
+
+#define PI 3.14159
+
+
+#define SAMPLE_RATE 44100
+#define N_CHANNELS 8
+
+float f(float t)
+{
+	const int f0 = 440;
+	const int f1 = 880;
+	return ( t*f1 ) + ( (1-t)*f0 );
+}
+
+
+void callback(int chan, void *d)
+{
+	bool *loop = d;
+	*loop = false;
+	printf("channel %d waves goodnight!\n", chan);
+}
+
+
+int main()
+{
+	float data[SAMPLE_RATE];
+	for (long i=0; i<SAMPLE_RATE; i++) {
+		float time = ((float)i)/SAMPLE_RATE;
+		data[i] = sin(2*PI*f(time)*time);
+	}
+
+	struct mossrose_sound_t sound = {
+		.left = data, .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");
+
+	int chan = mossrose_play(&sound, -1, 1);
+
+	bool loop = true;
+	mossrose_channel_set_callback(chan, callback, &loop);
+
+	while(loop) {
+		mossrose_poll_callbacks();
+	}
+
+	mossrose_terminate();
+	return 0;
+}
-- 
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