From 700befc8ac877c5c9ee74c69841d31d5f570ee9e Mon Sep 17 00:00:00 2001
From: neonloop
Date: Sun, 27 Mar 2022 17:46:39 +0000
Subject: Changes capacity to occupancy and return whole number as percent

Avoids float operations and redundant "1 -"
---
 main.c     |  8 ++++----
 plat.h     |  2 +-
 plat_sdl.c | 18 ++++++++++--------
 3 files changed, 15 insertions(+), 13 deletions(-)

diff --git a/main.c b/main.c
index e91b832..e004101 100644
--- a/main.c
+++ b/main.c
@@ -31,7 +31,7 @@ static int last_screenshot = 0;
 static uint32_t vsyncs;
 static uint32_t renders;
 
-#define UNDERRUN_THRESHOLD 0.5
+#define UNDERRUN_THRESHOLD 50
 
 static void toggle_fast_forward(int force_off)
 {
@@ -498,11 +498,11 @@ static void adjust_audio(void) {
 	}
 
 	if (current_core.retro_audio_buffer_status) {
-		float occupancy = 1.0 - plat_sound_capacity();
+		int occupancy = plat_sound_occupancy();
 		if (enable_drc)
-			occupancy = MIN(1.0, occupancy * 2.0);
+			occupancy = MIN(100, occupancy * 2);
 
-		current_core.retro_audio_buffer_status(true, (int)(occupancy * 100), occupancy < UNDERRUN_THRESHOLD);
+		current_core.retro_audio_buffer_status(true, occupancy, occupancy < UNDERRUN_THRESHOLD);
 	}
 }
 
diff --git a/plat.h b/plat.h
index fdcb1a9..84e4d1e 100644
--- a/plat.h
+++ b/plat.h
@@ -27,7 +27,7 @@ void plat_video_close(void);
 
 unsigned plat_cpu_ticks(void);
 
-float plat_sound_capacity(void);
+int plat_sound_occupancy(void);
 extern void (*plat_sound_write)(const struct audio_frame *data, int frames);
 void plat_sound_resize_buffer(void);
 
diff --git a/plat_sdl.c b/plat_sdl.c
index 817a47e..af2d6bf 100644
--- a/plat_sdl.c
+++ b/plat_sdl.c
@@ -28,8 +28,8 @@ static void plat_sound_select_resampler(void);
 void (*plat_sound_write)(const struct audio_frame *data, int frames);
 
 #define DRC_MAX_ADJUSTMENT 0.003
-#define DRC_ADJ_BELOW 0.4
-#define DRC_ADJ_ABOVE 0.6
+#define DRC_ADJ_BELOW 40
+#define DRC_ADJ_ABOVE 60
 
 static char msg[HUD_LEN];
 static unsigned msg_priority = 0;
@@ -357,11 +357,11 @@ static int plat_sound_init(void)
 	return 0;
 }
 
-float plat_sound_capacity(void)
+int plat_sound_occupancy(void)
 {
 	int buffered = 0;
 	if (audio.buf_len == 0)
-		return 1.0;
+		return 0;
 
 	if (audio.buf_w != audio.buf_r) {
 		buffered = audio.buf_w > audio.buf_r ?
@@ -369,7 +369,7 @@ float plat_sound_capacity(void)
 			(audio.buf_w + audio.buf_len) - audio.buf_r;
 	}
 
-	return 1.0 - (float)buffered / audio.buf_len;
+	return buffered * 100 / audio.buf_len;
 }
 
 #define BATCH_SIZE 100
@@ -380,10 +380,12 @@ void plat_sound_write_resample(const struct audio_frame *data, int frames, int (
 		return;
 
 	if (drc) {
-		if (plat_sound_capacity() < DRC_ADJ_BELOW) {
-			audio.adj_out_sample_rate = audio.out_sample_rate - audio.sample_rate_adj;
-		} else if (plat_sound_capacity() > DRC_ADJ_ABOVE) {
+		int occupancy = plat_sound_occupancy();
+
+		if (occupancy < DRC_ADJ_BELOW) {
 			audio.adj_out_sample_rate = audio.out_sample_rate + audio.sample_rate_adj;
+		} else if (occupancy > DRC_ADJ_ABOVE) {
+			audio.adj_out_sample_rate = audio.out_sample_rate - audio.sample_rate_adj;
 		} else {
 			audio.adj_out_sample_rate = audio.out_sample_rate;
 		}
-- 
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