Corrections to audio buffer size calculations

4 files changed, 34 insertions, 12 deletions

diff --git a/servers/audio/audio_driver_dummy.cpp b/servers/audio/audio_driver_dummy.cpp
index 992fece85f..1ae0e7b96b 100644
--- a/servers/audio/audio_driver_dummy.cpp
+++ b/servers/audio/audio_driver_dummy.cpp
@@ -37,17 +37,16 @@ Error AudioDriverDummy::init() {
 	active = false;
 	thread_exited = false;
 	exit_thread = false;
-	pcm_open = false;
 	samples_in = NULL;
 
-	mix_rate = 44100;
+	mix_rate = DEFAULT_MIX_RATE;
 	speaker_mode = SPEAKER_MODE_STEREO;
 	channels = 2;
 
-	int latency = GLOBAL_DEF("audio/output_latency", 25);
-	buffer_size = next_power_of_2(latency * mix_rate / 1000);
+	int latency = GLOBAL_DEF("audio/output_latency", DEFAULT_OUTPUT_LATENCY);
+	buffer_frames = closest_power_of_2(latency * mix_rate / 1000);
 
-	samples_in = memnew_arr(int32_t, buffer_size * channels);
+	samples_in = memnew_arr(int32_t, buffer_frames * channels);
 
 	mutex = Mutex::create();
 	thread = Thread::create(AudioDriverDummy::thread_func, this);
@@ -59,17 +58,15 @@ void AudioDriverDummy::thread_func(void *p_udata) {
 
 	AudioDriverDummy *ad = (AudioDriverDummy *)p_udata;
 
-	uint64_t usdelay = (ad->buffer_size / float(ad->mix_rate)) * 1000000;
+	uint64_t usdelay = (ad->buffer_frames / float(ad->mix_rate)) * 1000000;
 
 	while (!ad->exit_thread) {
 
-		if (!ad->active) {
-
-		} else {
+		if (ad->active) {
 
 			ad->lock();
 
-			ad->audio_server_process(ad->buffer_size, ad->samples_in);
+			ad->audio_server_process(ad->buffer_frames, ad->samples_in);
 
 			ad->unlock();
 		};
diff --git a/servers/audio/audio_driver_dummy.h b/servers/audio/audio_driver_dummy.h
index b3fea59389..90af1961b7 100644
--- a/servers/audio/audio_driver_dummy.h
+++ b/servers/audio/audio_driver_dummy.h
@@ -43,8 +43,8 @@ class AudioDriverDummy : public AudioDriver {
 	int32_t *samples_in;
 
 	static void thread_func(void *p_udata);
-	int buffer_size;
 
+	unsigned int buffer_frames;
 	unsigned int mix_rate;
 	SpeakerMode speaker_mode;
 
@@ -53,7 +53,6 @@ class AudioDriverDummy : public AudioDriver {
 	bool active;
 	bool thread_exited;
 	mutable bool exit_thread;
-	bool pcm_open;
 
 public:
 	const char *get_name() const {
diff --git a/servers/audio_server.cpp b/servers/audio_server.cpp
index c0343399c3..3139c6bb7a 100644
--- a/servers/audio_server.cpp
+++ b/servers/audio_server.cpp
@@ -155,6 +155,29 @@ void AudioServer::_driver_process(int p_frames, int32_t *p_buffer) {
 		todo -= to_copy;
 		to_mix -= to_copy;
 	}
+
+#ifdef DEBUG_ENABLED
+	if (OS::get_singleton() && OS::get_singleton()->is_stdout_verbose()) {
+		static uint64_t first_ticks = 0;
+		static uint64_t last_ticks = 0;
+		static uint64_t ticks = 0;
+		static int count = 0;
+		static int total = 0;
+
+		ticks = OS::get_singleton()->get_ticks_msec();
+		if ((ticks - first_ticks) > 10 * 1000) {
+			print_line("Audio Driver " + String(AudioDriver::get_singleton()->get_name()) + " average latency: " + itos(total / count) + "ms (frame=" + itos(p_frames) + ")");
+			first_ticks = ticks;
+			total = 0;
+			count = 0;
+		}
+
+		total += ticks - last_ticks;
+		count++;
+
+		last_ticks = ticks;
+	}
+#endif
 }
 
 void AudioServer::_mix_step() {
diff --git a/servers/audio_server.h b/servers/audio_server.h
index 05e92ceaf0..13a74856c8 100644
--- a/servers/audio_server.h
+++ b/servers/audio_server.h
@@ -54,6 +54,9 @@ public:
 		SPEAKER_SURROUND_71,
 	};
 
+	static const int DEFAULT_MIX_RATE = 44100;
+	static const int DEFAULT_OUTPUT_LATENCY = 15;
+
 	static AudioDriver *get_singleton();
 	void set_singleton();