From 139c793b584a76acd42d72ec019d2cabab7d3ee7 Mon Sep 17 00:00:00 2001
From: Nebuleon Fumika
Date: Tue, 25 Dec 2012 22:44:39 -0500
Subject: Smoother sound. Raise the sound sampling frequency to 48000 Hz.

---
 source/nds/ds2_main.c |  5 +++--
 source/nds/ds2sound.h | 24 ++++++++++++++++++++++++
 source/nds/entry.cpp  | 24 ++++++------------------
 3 files changed, 33 insertions(+), 20 deletions(-)
 create mode 100644 source/nds/ds2sound.h

(limited to 'source')

diff --git a/source/nds/ds2_main.c b/source/nds/ds2_main.c
index 2d73313..7229727 100644
--- a/source/nds/ds2_main.c
+++ b/source/nds/ds2_main.c
@@ -23,6 +23,7 @@
 #include "ds2io.h"
 #include "ds2_timer.h"
 #include "ds2_malloc.h"
+#include "ds2sound.h"
 
 #define BLACK_COLOR		RGB15(0, 0, 0)
 #define WHITE_COLOR		RGB15(31, 31, 31)
@@ -45,9 +46,9 @@ void ddump_mem(unsigned char* addr, unsigned int len)
 void ds2_main(void)
 {
 	int err;
-ds2_setCPUclocklevel(13);
+	ds2_setCPUclocklevel(13);
 	//Initial video and audio and other input and output
-	err = ds2io_initb(512, 22050, 0, 0);
+	err = ds2io_initb(DS2_BUFFER_SIZE, SND_SAMPLE_RATE, 0, 0);
 	if(err) goto _failure;
 
 	//Initial file system
diff --git a/source/nds/ds2sound.h b/source/nds/ds2sound.h
new file mode 100644
index 0000000..cf37f6f
--- /dev/null
+++ b/source/nds/ds2sound.h
@@ -0,0 +1,24 @@
+// The sound buffer sizes used on the DS2's side, for each value of
+// Settings.SoundPlaybackRate.
+#define DS2_BUFFER_SIZE_1 256
+#define DS2_BUFFER_SIZE_2 256
+#define DS2_BUFFER_SIZE_3 256
+#define DS2_BUFFER_SIZE_4 512
+#define DS2_BUFFER_SIZE_5 512
+#define DS2_BUFFER_SIZE_6 1024
+#define DS2_BUFFER_SIZE_7 1024
+
+// The sampling rate for the sound, in Hz, for each value of
+// Settings.SoundPlaybackRate.
+#define SND_SAMPLE_RATE_1 8000
+#define SND_SAMPLE_RATE_2 11025
+#define SND_SAMPLE_RATE_3 16000
+#define SND_SAMPLE_RATE_4 22050
+#define SND_SAMPLE_RATE_5 32000
+#define SND_SAMPLE_RATE_6 44100
+#define SND_SAMPLE_RATE_7 48000
+
+// Settings in use. The number should match in all three settings.
+#define DS2_BUFFER_SIZE   DS2_BUFFER_SIZE_7
+#define SND_SAMPLE_RATE   SND_SAMPLE_RATE_7
+#define SNES9X_SRATE_ID   7
diff --git a/source/nds/entry.cpp b/source/nds/entry.cpp
index ce8d732..a8e2217 100644
--- a/source/nds/entry.cpp
+++ b/source/nds/entry.cpp
@@ -20,6 +20,7 @@
 
 #include "draw.h"
 #include "gui.h"
+#include "ds2sound.h"
 
 void S9xProcessSound (unsigned int);
 
@@ -359,9 +360,9 @@ void init_sfc_setting(void)
     Settings.JoystickEnabled = FALSE;
 #endif
 
-    Settings.SoundPlaybackRate = 4;	//2 = 11025, 4 = 22050, 6 = 44100
+    Settings.SoundPlaybackRate = SNES9X_SRATE_ID;	// -> ds2sound.h for defs
     Settings.Stereo = TRUE;
-    Settings.SoundBufferSize = 0;
+    Settings.SoundBufferSize = DS2_BUFFER_SIZE;
     Settings.CyclesPercentage = 100;
     Settings.DisableSoundEcho = FALSE;
 	//sound settings
@@ -767,28 +768,15 @@ void S9xSyncSpeed ()
 #endif
 }
 
-/*
-*   Open sound device
-*/
-static int Rates[8] =
-{
-    0, 8000, 11025, 16000, 22050, 32000, 44100, 48000
-};
-
-static int BufferSizes [8] =
-{
-    0, 256, 256, 256, 512, 512, 1024, 1024
-};
-
 bool8 S9xOpenSoundDevice (int mode, bool8 stereo, int buffer_size)
 {
 	so.sixteen_bit = TRUE;
     so.stereo = stereo;
-    so.playback_rate = Rates[mode & 0x07];
+    so.playback_rate = SND_SAMPLE_RATE;
     S9xSetPlaybackRate (so.playback_rate);
 
     if (buffer_size == 0)
-	    buffer_size = BufferSizes [mode & 7];
+	    buffer_size = DS2_BUFFER_SIZE;
 
     if (buffer_size > MAX_BUFFER_SIZE / 4)
 	    buffer_size = MAX_BUFFER_SIZE / 4;
@@ -936,7 +924,7 @@ void S9xProcessSound (unsigned int)
 //		block_generate_sound = FALSE;
 
 		unsigned short *dst_pt = audiobuff;
-		unsigned short *dst_pt1 = dst_pt + 512;
+		unsigned short *dst_pt1 = dst_pt + DS2_BUFFER_SIZE;
 
 		/* Feed the samples to the soundcard until nothing is left */
 		for(;;)
-- 
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