From 184fe19a794a5cc08a7e4eefa5d4d5f980455943 Mon Sep 17 00:00:00 2001
From: twinaphex <libretro@gmail.com>
Date: Sat, 11 Apr 2015 06:56:02 +0200
Subject: [PATCH] Implement stub versions of write_avail for SDL and CTR audio
 drivers

---
 audio/audio_driver.c      | 8 ++++----
 audio/drivers/ctr_audio.c | 9 ++++++++-
 audio/drivers/sdl_audio.c | 1 +
 3 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/audio/audio_driver.c b/audio/audio_driver.c
index 8f43b673c0..5c90047fcf 100644
--- a/audio/audio_driver.c
+++ b/audio/audio_driver.c
@@ -409,7 +409,9 @@ void init_audio(void)
    if (!global->system.audio_callback.callback && driver->audio_active &&
          settings->audio.rate_control)
    {
-      if (driver->audio->buffer_size && driver->audio->write_avail)
+      /* Audio rate control requires write_avail
+       * and buffer_size to be implemented. */
+      if (driver->audio->buffer_size)
       {
          global->audio_data.driver_buffer_size = 
             driver->audio->buffer_size(driver->audio_data);
@@ -473,9 +475,7 @@ static int audio_driver_write_avail(void)
    driver_t *driver     = driver_get_ptr();
    const audio_driver_t *audio = audio_get_ptr(driver);
 
-   if (audio->write_avail)
-      return audio->write_avail(driver->audio_data);
-   return 0;
+   return audio->write_avail(driver->audio_data);
 }
 
 /*
diff --git a/audio/drivers/ctr_audio.c b/audio/drivers/ctr_audio.c
index 50e46c0561..a82f15561c 100644
--- a/audio/drivers/ctr_audio.c
+++ b/audio/drivers/ctr_audio.c
@@ -204,6 +204,13 @@ static bool ctr_audio_use_float(void *data)
    return false;
 }
 
+static size_t ctr_audio_write_avail(void *data)
+{
+   /* stub */
+   (void)data;
+   return 0;
+}
+
 audio_driver_t audio_ctr = {
    ctr_audio_init,
    ctr_audio_write,
@@ -214,6 +221,6 @@ audio_driver_t audio_ctr = {
    ctr_audio_free,
    ctr_audio_use_float,
    "ctr",
-   NULL,
+   ctr_audio_write_avail,
    NULL
 };
diff --git a/audio/drivers/sdl_audio.c b/audio/drivers/sdl_audio.c
index 0d05836874..bdccd0d2ce 100644
--- a/audio/drivers/sdl_audio.c
+++ b/audio/drivers/sdl_audio.c
@@ -233,6 +233,7 @@ static bool sdl_audio_use_float(void *data)
 
 static size_t sdl_audio_write_avail(void *data)
 {
+   /* stub */
    (void)data;
    return 0;
 }