From 0a95a4ea248047a51c665d6214236c560d2aa46f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=D0=A0=D1=83=D1=81=D0=BB=D0=B0=D0=BD=20=D0=98=D0=B6=D0=B1?=
 =?UTF-8?q?=D1=83=D0=BB=D0=B0=D1=82=D0=BE=D0=B2?= <lrn1986@gmail.com>
Date: Sun, 26 Apr 2015 20:55:03 +0000
Subject: [PATCH] libde265: W32 thread count support

This code is imported from GLib g_get_num_processors(). This function
was added in 2.36 but we depend on 2.32.

https://bugzilla.gnome.org/show_bug.cgi?id=748495
---
 ext/libde265/libde265-dec.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/ext/libde265/libde265-dec.c b/ext/libde265/libde265-dec.c
index c47917b198..d52e8ce253 100644
--- a/ext/libde265/libde265-dec.c
+++ b/ext/libde265/libde265-dec.c
@@ -42,6 +42,9 @@
 #ifdef HAVE_UNISTD_H
 #include <unistd.h>
 #endif
+#ifdef G_OS_WIN32
+#include <windows.h>
+#endif
 
 #include "libde265-dec.h"
 
@@ -378,6 +381,30 @@ gst_libde265_dec_start (GstVideoDecoder * decoder)
     threads = sysconf (_SC_NPROC_ONLN);
 #elif defined(_SC_NPROCESSORS_ONLN)
     threads = sysconf (_SC_NPROCESSORS_ONLN);
+#elif defined(G_OS_WIN32)
+    /* FIXME 2.0, use g_get_num_processors() */
+    SYSTEM_INFO sysinfo;
+    DWORD_PTR process_cpus;
+    DWORD_PTR system_cpus;
+
+    /* This *never* fails, but doesn't take CPU affinity into account */
+    GetSystemInfo (&sysinfo);
+    threads = (int) sysinfo.dwNumberOfProcessors;
+
+    /* This *can* fail, but produces correct results if affinity mask is used,
+     * unlike the simpler code above.
+     */
+    if (GetProcessAffinityMask (GetCurrentProcess (),
+            &process_cpus, &system_cpus)) {
+      unsigned int count;
+
+      for (count = 0; process_cpus != 0; process_cpus >>= 1)
+        if (process_cpus & 1)
+          count++;
+
+      if (count > 0)
+        threads = (int) count;
+    }
 #else
 #warning "Don't know how to get number of CPU cores, will use the default thread count"
     threads = DEFAULT_THREAD_COUNT;