Added CPU detection.

Original commit message from CVS:
Added CPU detection.
Added SSE optimisation to mpeg_play
Modified the mpeg2 decoder and gstidct to use cpu detection.
Cleanups in the mpeg1 and mpeg2 decoders.

gst/Makefile.am

@@ -15,6 +15,8 @@ libgst_la_SOURCES =	\
 	gstbuffer.c	\
 	gstbufferpool.c	\
 	gstclock.c	\
+	gstcpu.c	\
+	gstcpuid_i386.s	\
 	gstelement.c	\
 	gstelementfactory.c	\
 	gstbin.c	\
@@ -42,6 +44,7 @@ libgstinclude_HEADERS =	\
 	gstbuffer.h	\
 	gstbufferpool.h	\
 	gstclock.h	\
+	gstcpu.h	\
 	gstelement.h	\
 	gstbin.h	\
 	gstpipeline.h	\

gst/gst.c

@@ -36,6 +36,7 @@ void gst_init(int *argc,char **argv[]) {
 
   gtk_init(argc,argv);
 
+  _gst_cpu_initialize();
   _gst_type_initialize();
   _gst_plugin_initialize();
   _gst_buffer_initialize();

gst/gst.h

@@ -30,8 +30,8 @@
 #include <gst/gstobject.h>
 #include <gst/gstpad.h>
 #include <gst/gstbuffer.h>
+#include <gst/gstcpu.h>
 #include <gst/gstelement.h>
-
 #include <gst/gstbin.h>
 #include <gst/gstpipeline.h>
 #include <gst/gstthread.h>

gst/gstcpu.c

@@ -0,0 +1,49 @@
+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+#include "config.h"
+#include "gstcpu.h"
+
+static guint32 _gst_cpu_flags;
+
+#ifdef __i386__
+void gst_cpuid_i386(int,long *,long *,long *,long *);
+#define gst_cpuid gst_cpuid_i386
+
+#else
+#define gst_cpuid(o,a,b,c,d)
+#endif
+
+void _gst_cpu_initialize(void) 
+{
+  long eax=0, ebx=0, ecx=0, edx=0;
+
+  gst_cpuid(1, &eax, &ebx, &ecx, &edx);
+
+  if (edx & (1<<23)) _gst_cpu_flags |= GST_CPU_FLAG_MMX;
+  if (edx & (1<<25)) _gst_cpu_flags |= GST_CPU_FLAG_SSE;
+
+  g_print("CPU features (%08x)\n", _gst_cpu_flags);
+}
+
+guint32 gst_cpu_get_flags(void) 
+{
+  return _gst_cpu_flags;
+}

gst/gstcpu.h

@@ -0,0 +1,33 @@
+/* Gnome-Streamer
+ * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+
+#ifndef __GST_CPU_H__
+#define __GST_CPU_H__
+
+#include <glib.h>
+
+#define  GST_CPU_FLAG_MMX 		(1 << 0)
+#define  GST_CPU_FLAG_SSE 		(1 << 1)
+
+void _gst_cpu_initialize();
+
+guint32 gst_cpu_get_flags();
+
+#endif /* __GST_CPU_H__ */

gst/gstcpuid_i386.s

@@ -0,0 +1,45 @@
+	.text
+.globl gst_cpuid_i386
+	.type	 gst_cpuid_i386,@function
+gst_cpuid_i386:
+	pushl %ebp
+	movl %esp,%ebp
+	pushl %edi
+	pushl %ebx
+	pushl %ecx
+	pushl %edx
+	movl 8(%ebp),%eax
+	cpuid
+	movl 12(%ebp),%edi
+	test %edi,%edi
+	jz L1	
+	movl %eax,(%edi)
+L1:	movl 16(%ebp),%edi
+	test %edi,%edi
+	jz L2
+	movl %ebx,(%edi)
+L2:	movl 20(%ebp),%edi
+	test %edi,%edi
+	jz L3
+	movl %ecx,(%edi)
+L3:	movl 24(%ebp),%edi
+	test %edi,%edi
+	jz L4
+	movl %edx,(%edi)
+L4:	popl %edx
+	popl %ecx
+	popl %ebx
+	popl %edi
+	movl %ebp,%esp
+	popl %ebp
+	ret
+
+/ doesn't work in user mode (MSRs are privileged)
+.globl siddisable
+siddisable:
+	movl 0x119,%ecx
+	rdmsr
+	orl 0x200000,%eax
+	wrmsr
+	ret
+	

libs/idct/gstidct.c

@@ -20,6 +20,7 @@
 
 #include <config.h>
 
+#include <gst/gstcpu.h>
 #include "gstidct.h"
 #include "dct.h"
 
@@ -33,10 +34,14 @@ GstIDCT *gst_idct_new(GstIDCTMethod method)
 
   if (method == GST_IDCT_DEFAULT) {
 #ifdef HAVE_LIBMMX
-	 method = GST_IDCT_MMX32;
-#else
-	 method = GST_IDCT_FAST_INT;
+    if (gst_cpu_get_flags() & GST_CPU_FLAG_MMX) {
+      method = GST_IDCT_MMX;
+    }
+    else
 #endif
+    {
+      method = GST_IDCT_FAST_INT;
+    }
   }
 
   new->convert_sparse = gst_idct_int_sparse_idct;