From e49d216884074bea33e7f1e947094bdf4c64427e Mon Sep 17 00:00:00 2001
From: Themaister <maister@archlinux.us>
Date: Sat, 19 Nov 2011 14:16:55 +0100
Subject: [PATCH] Check for large skews in timing.

---
 driver.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/driver.c b/driver.c
index c82bc45c45..6f6752264f 100644
--- a/driver.c
+++ b/driver.c
@@ -228,6 +228,19 @@ static void adjust_audio_input_rate(void)
    if (!first)
       return;
 
+   if (g_extern.system.timing_set)
+   {
+      float timing_skew = fabs(1.0f - g_extern.system.timing.fps / g_settings.video.refresh_rate);
+      if (timing_skew > 0.05f) // We don't want to adjust pitch too much. If we have extreme cases, just don't readjust at all.
+      {
+         SSNES_LOG("Timings deviate too much. Will not adjust. (Display = %.2f Hz, Game = %.2lf Hz)\n",
+               g_settings.video.refresh_rate,
+               g_extern.system.timing.fps);
+
+         g_settings.video.refresh_rate = g_extern.system.timing.fps;
+      }
+   }
+
    if (g_extern.system.timing_set)
    {
       g_settings.audio.in_rate = g_extern.system.timing.sample_rate *
@@ -239,7 +252,7 @@ static void adjust_audio_input_rate(void)
          (g_settings.video.refresh_rate / (21477272.0 / 357366.0)); // SNES metrics.
    }
 
-   SSNES_LOG("Adjusted audio input rate to: %.2f Hz.\n", g_settings.audio.in_rate);
+   SSNES_LOG("Set audio input rate to: %.2f Hz.\n", g_settings.audio.in_rate);
    first = false;
 }