audio

1 files changed, 98 insertions, 0 deletions

diff --git a/plat.c b/plat.c
index 2101910..e178137 100644
--- a/plat.c
+++ b/plat.c
@@ -427,3 +427,101 @@ void app_end(App* a) {
 }
 
 #endif
+
+
+#ifdef plat_pulse
+#include "maths.h"
+#define inline /* erm sir we are using C90 here... */
+#include <stdlib.h>
+#include <math.h>
+#include <pulse/simple.h>
+#include <pthread.h>
+
+struct {
+	short* buf;
+	pa_simple* dev;
+	int r, play, time;
+	pthread_t worker;
+	pthread_mutex_t mutex;
+} audio;
+
+void* audio_worker(void* arg) {
+	const int s = audio_buffer_size;
+	int i, c = 1;
+	short* buf = audio.buf;
+	pa_simple* dev = audio.dev;
+	(void)arg;
+	while (c) {
+		pthread_mutex_lock(&audio.mutex);
+		if (!audio.r) c = 0;
+		for (
+			i = 0;
+			i < s && audio.play;
+			i++, audio.play--, audio.time++
+		) buf[i] = (short)(sin((double)audio.time / 0.05) * 16000.0);
+		pthread_mutex_unlock(&audio.mutex);
+		for (; i < s; i++) {
+			buf[i] = 0;
+		}
+		pa_simple_write(dev, buf, s * sizeof(short), 0);
+	}
+	return 0;
+}
+
+void init_audio(void) {
+	pa_sample_spec sp = { 0 };
+	sp.format = PA_SAMPLE_S16LE;
+	sp.channels = 1;
+	sp.rate = audio_sample_rate;
+	audio.dev = pa_simple_new(
+		0,
+		game_name,
+		PA_STREAM_PLAYBACK,
+		0,
+		"Game Audio",
+		&sp,
+		0,
+		0,
+		0
+	);
+	audio.r = 0;
+	audio.play = 0;
+	if (!audio.dev) {
+		print_err("Failed to create audio device.\n");
+		print_war("Running without audio.\n");
+		return;
+	}
+	audio.r = 1;
+	audio.buf = malloc(
+		audio_buffer_size *
+		sizeof *audio.buf
+	);
+	pthread_mutex_init(&audio.mutex, 0);
+	pthread_create(
+		&audio.worker,
+		0,
+		audio_worker,
+		0
+	);
+}
+
+void deinit_audio(void) {
+	if (audio.dev) {
+		pthread_mutex_lock(&audio.mutex);
+		audio.r = 0;
+		pthread_mutex_unlock(&audio.mutex);
+		pthread_mutex_destroy(&audio.mutex);
+		pthread_join(audio.worker, 0);
+		pa_simple_drain(audio.dev, 0);
+		pa_simple_free(audio.dev);
+		free(audio.buf);
+	}
+}
+
+void play_sound(int len) {
+	pthread_mutex_lock(&audio.mutex);
+	audio.play += len;
+	pthread_mutex_unlock(&audio.mutex);
+}
+
+#endif