From 91790a5e081ca6738ef803c554aa47105a6cf80a Mon Sep 17 00:00:00 2001
From: Brandon Wright <bearoso@gmail.com>
Date: Thu, 3 Nov 2016 15:47:33 -0500
Subject: [PATCH] Generate sample example.

---
 apu/apu.cpp | 16 ++++++++--------
 msu1.cpp    | 16 ++++++++++------
 msu1.h      |  2 +-
 3 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/apu/apu.cpp b/apu/apu.cpp
index 2fecd7e5..f31153a7 100644
--- a/apu/apu.cpp
+++ b/apu/apu.cpp
@@ -383,7 +383,13 @@ void S9xFinalizeSamples (void)
 {
 	if (!Settings.Mute)
 	{
-		if (!spc::resampler->push((short *) spc::landing_buffer, SNES::dsp.spc_dsp.sample_count ()))
+		if (Settings.MSU1)
+		{
+			S9xMSU1Generate (SNES::dsp.spc_dsp.sample_count());
+			msu::resampler->push((short *) msu::landing_buffer, S9xMSU1Samples());
+		}
+
+		if (!spc::resampler->push((short *) spc::landing_buffer, SNES::dsp.spc_dsp.sample_count()))
 		{
 			/* We weren't able to process the entire buffer. Potential overrun. */
 			spc::sound_in_sync = FALSE;
@@ -391,13 +397,9 @@ void S9xFinalizeSamples (void)
 			if (Settings.SoundSync && !Settings.TurboMode)
 				return;
 		}
-
-		if (Settings.MSU1 && !msu::resampler->push((short *) msu::landing_buffer, S9xMSU1Samples()))
-		{
-
-		}
 	}
 
+
 	if (!Settings.SoundSync || Settings.TurboMode || Settings.Mute)
 		spc::sound_in_sync = TRUE;
 	else
@@ -649,8 +651,6 @@ void S9xAPUEndScanline (void)
 	S9xAPUExecute();
 	SNES::dsp.synchronize();
 
-	S9xMSU1Execute();
-
 	if (SNES::dsp.spc_dsp.sample_count() >= APU_MINIMUM_SAMPLE_BLOCK || !spc::sound_in_sync)
 		S9xLandSamples();
 }
diff --git a/msu1.cpp b/msu1.cpp
index e86b3bbc..f15a04b3 100644
--- a/msu1.cpp
+++ b/msu1.cpp
@@ -199,6 +199,7 @@ std::ifstream dataFile, audioFile;
 uint32 dataPos, audioPos, audioResumePos, audioLoopPos;
 uint16 audioTrack, audioResumeTrack;
 char fName[64];
+uint32 partial_samples;
 
 // Sample buffer
 int16 *bufPos, *bufBegin, *bufEnd;
@@ -222,6 +223,8 @@ void S9xMSU1Init(void)
 	bufBegin			= 0;
 	bufEnd				= 0;
 
+	partial_samples = 0;
+
 	if (dataFile.is_open())
 		dataFile.close();
 
@@ -231,20 +234,19 @@ void S9xMSU1Init(void)
 	dataFile.open(S9xGetFilename(".msu", ROMFILENAME_DIR), std::ios::in | std::ios::binary);
 }
 
-void S9xMSU1Execute(void)
+void S9xMSU1Generate(int sample_count)
 {
-	static long long hitcount = 0;
-	//return; // Dummy out for now because it's broken
-	while ((bufPos < bufEnd) && (MSU1.MSU1_STATUS & AudioPlaying))
+	partial_samples += 441000 * sample_count;
+
+	while ((bufPos < bufEnd) && (MSU1.MSU1_STATUS & AudioPlaying) && partial_samples > 320405)
 	{
-		hitcount++;
 		if (audioFile.good())
 		{
 			audioPos += 2;
 			int16 sample = 0;
 			((uint8 *)&sample)[0] = audioFile.get();
 			((uint8 *)&sample)[1] = audioFile.get();
-			
+
 			sample = (double)sample * (double)MSU1.MSU1_VOLUME / 255.0;
 
 			*bufPos = ((uint8 *)&sample)[0];
@@ -252,6 +254,8 @@ void S9xMSU1Execute(void)
 
 			bufPos += 2;
 
+			partial_samples -= 320405;
+
 			if (audioFile.eof())
 			{
 				if (MSU1.MSU1_STATUS & AudioRepeating)
diff --git a/msu1.h b/msu1.h
index acfde1c9..ddf0728a 100644
--- a/msu1.h
+++ b/msu1.h
@@ -216,7 +216,7 @@ enum SMSU1_FLAG : uint8 {
 extern struct SMSU1	MSU1;
 
 void S9xMSU1Init(void);
-void S9xMSU1Execute(void);
+void S9xMSU1Generate(int sample_count);
 uint8 S9xMSU1ReadPort(int port);
 void S9xMSU1WritePort(int port, uint8 byte);
 uint16 S9xMSU1Samples(void);