From 8bc3d3ac5cab924f07dfea74d8e5d89b52fd2dc0 Mon Sep 17 00:00:00 2001
From: Themaister <maister@archlinux.us>
Date: Mon, 23 May 2011 14:04:31 +0200
Subject: [PATCH] Add possibility for audio driver to override sample rate.

---
 audio/ext.c             | 3 +++
 audio/ext/ssnes_audio.h | 9 ++++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/audio/ext.c b/audio/ext.c
index 4e2b0081e6..931778643b 100644
--- a/audio/ext.c
+++ b/audio/ext.c
@@ -100,6 +100,9 @@ static void* audio_ext_init(const char *device, unsigned rate, unsigned latency)
       goto error;
    }
 
+   if (ext->driver->sample_rate)
+      g_settings.audio.out_rate = ext->driver->sample_rate(ext->handle);
+
    return ext;
 
 error:
diff --git a/audio/ext/ssnes_audio.h b/audio/ext/ssnes_audio.h
index dc56808d4d..b9c32f1d47 100644
--- a/audio/ext/ssnes_audio.h
+++ b/audio/ext/ssnes_audio.h
@@ -38,7 +38,7 @@ extern "C" {
 #define SSNES_ERROR 0
 #endif
 
-#define SSNES_AUDIO_API_VERSION 1
+#define SSNES_AUDIO_API_VERSION 2
 
 typedef struct ssnes_audio_driver_info
 {
@@ -103,6 +103,13 @@ typedef struct ssnes_audio_driver
    // [-1.0, 1.0].
    int (*use_float)(void *data);
 
+   // The driver might be forced to use a certain output frequency
+   // (i.e. Jack), and thus to avoid double resampling, the driver
+   // can request SSNES to resample to a different sample rate.
+   // This function can be set to NULL if the driver does not
+   // desire to override the sample rate.
+   unsigned (*sample_rate)(void *data);
+
    // Human readable identification string for the driver.
    const char *ident;