From 9994023f09e29f1d73504ebd0620c27885169eb7 Mon Sep 17 00:00:00 2001
From: Brandon Wright <bearoso@gmail.com>
Date: Tue, 5 Feb 2019 19:56:59 -0600
Subject: [PATCH] Allow use of Snes9x-side buffer if needed.

---
 apu/apu.cpp           | 12 ++++++++----
 gtk/src/gtk_sound.cpp |  5 ++++-
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/apu/apu.cpp b/apu/apu.cpp
index d0c0c049..65d6d2c5 100644
--- a/apu/apu.cpp
+++ b/apu/apu.cpp
@@ -224,24 +224,28 @@ static void UpdatePlaybackRate(void)
     }
 }
 
-bool8 S9xInitSound(int unused, int unused2)
+bool8 S9xInitSound(int buffer_ms, int unused2)
 {
     // The resampler and spc unit use samples (16-bit short) as arguments.
+    int buffer_size_samples = MAX_SAMPLE_FRAMES * 2;
+    if (buffer_ms > 0)
+        buffer_size_samples = Settings.SoundPlaybackRate * buffer_ms * 2 / 1000;
+
     if (!spc::resampler)
     {
-        spc::resampler = new HermiteResampler(MAX_SAMPLE_FRAMES * 2);
+        spc::resampler = new HermiteResampler(buffer_size_samples);
         if (!spc::resampler)
             return (FALSE);
     }
 
     if (!msu::resampler)
     {
-        msu::resampler = new HermiteResampler(msu::buffer_size);
+        msu::resampler = new HermiteResampler(buffer_size_samples * 3 / 2);
         if (!msu::resampler)
             return (FALSE);
     }
     else
-        msu::resampler->resize(msu::buffer_size);
+        msu::resampler->resize(buffer_size_samples * 3 / 2);
 
     reset_dsp_output();
 
diff --git a/gtk/src/gtk_sound.cpp b/gtk/src/gtk_sound.cpp
index eeaeab23..ac85728b 100644
--- a/gtk/src/gtk_sound.cpp
+++ b/gtk/src/gtk_sound.cpp
@@ -144,7 +144,10 @@ S9xPortSoundInit ()
 
         Settings.SoundPlaybackRate = playback_rates[gui_config->sound_playback_rate];
 
-        S9xInitSound (gui_config->sound_buffer_size, 0);
+        if (gui_config->sound_driver == sdl_driver)
+            S9xInitSound(gui_config->sound_buffer_size, 0);
+        else
+            S9xInitSound(0, 0);
 
         S9xSetSoundMute (false);
     }