Strategies and runtime detection/choice of best algorithm

src/Makefile

@@ -50,7 +50,7 @@ LDFLAGS += -lm
 LD = gcc -fopenmp
 YASM = yasm
 ASMOBJS = cpu.o
-OBJS = interface_main.o encmain.o bitstream.o cabac.o config.o context.o encoder.o filter.o inter.o intra.o nal.o picture.o rdo.o sao.o scalinglist.o search.o tables.o transform.o
+OBJS = interface_main.o encmain.o bitstream.o cabac.o config.o context.o encoder.o filter.o inter.o intra.o nal.o picture.o rdo.o sao.o scalinglist.o search.o strategyselector.o tables.o transform.o
 PROG  = ./kvazaar
 PROGS = $(PROG)
 

src/encmain.c

@@ -42,9 +42,7 @@
 #include "picture.h"
 #include "transform.h"
 #include "scalinglist.h"
-
+#include "strategyselector.h"
-// Assembly optimization headers
-#include "x86/cpu.h"
 
 /**
  * \brief Program main function.
@@ -54,9 +52,6 @@
  */
 int main(int argc, char *argv[])
 {
-  int ecx = 0,edx =0;
-  /* CPU feature bits */
-  enum { BIT_SSE3 = 0,BIT_SSSE3 = 9, BIT_SSE41 = 19, BIT_SSE42 = 20, BIT_MMX = 24, BIT_SSE = 25, BIT_SSE2 = 26, BIT_AVX = 28};
   config *cfg  = NULL; //!< Global configuration
   FILE *input  = NULL; //!< input file (YUV)
   FILE *output = NULL; //!< output file (HEVC NAL stream)
@@ -77,6 +72,13 @@ int main(int argc, char *argv[])
       _setmode( _fileno( stderr ), _O_TEXT );
   #endif
 
+  //Initialize strategies
+  if (!strategyselector_init()) {
+    fprintf(stderr, "Failed to initialize strategies.\n");
+    return EXIT_FAILURE;
+  }
+    
+
   // Handle configuration
   cfg = config_alloc();
 
@@ -179,21 +181,6 @@ int main(int argc, char *argv[])
     goto exit_failure;
   }
 
-  // Dig CPU features with cpuid
-  kvz_cpu_cpuid(&ecx,&edx);
-  fprintf(stderr, "CPU features enabled: ");
-  // EDX
-  if (edx & (1<<BIT_MMX))   fprintf(stderr, "MMX ");
-  if (edx & (1<<BIT_SSE))   fprintf(stderr, "SSE ");
-  if (edx & (1<<BIT_SSE2))  fprintf(stderr, "SSE2 ");
-  // ECX
-  if (ecx & (1<<BIT_SSE3))  fprintf(stderr, "SSE3 ");
-  if (ecx & (1<<BIT_SSSE3)) fprintf(stderr, "SSSE3 ");
-  if (ecx & (1<<BIT_SSE41)) fprintf(stderr, "SSE4.1 ");
-  if (ecx & (1<<BIT_SSE42)) fprintf(stderr, "SSE4.2 ");
-  if (ecx & (1<<BIT_AVX))   fprintf(stderr, "AVX ");
-  fprintf(stderr, "\n");
-
   // Check if the input file name is a dash, this means stdin
   if (!strcmp(cfg->input, "-")) {
     input = stdin;
@@ -391,6 +378,8 @@ int main(int argc, char *argv[])
 
   free_exp_golomb();
   
+  strategyselector_free();
+
   return EXIT_SUCCESS;
 
 exit_failure:
@@ -398,5 +387,6 @@ exit_failure:
   if (input) fclose(input);
   if (output) fclose(output);
   if (recout) fclose(recout);
+  strategyselector_free();
   return EXIT_FAILURE;
 }

src/picture.c

@@ -22,6 +22,7 @@
  */
 
 #include "picture.h"
+#include "strategyselector.h"
 
 #include <string.h>
 #include <stdio.h>
@@ -769,42 +770,6 @@ static unsigned hor_sad(const pixel *pic_data, const pixel *ref_data,
 }
 
 
-#if defined(__SSE2__)
-#include "inline-optimizations/picture-sse2.c"
-#elif defined(__ALTIVEC__)
-#include "picture-altivec.c"
-#else
-//Generic implementations
-/**
- * \brief Calculate Sum of Absolute Differences (SAD)
- *
- * Calculate Sum of Absolute Differences (SAD) between two rectangular regions
- * located in arbitrary points in the picture.
- *
- * \param data1   Starting point of the first picture.
- * \param data2   Starting point of the second picture.
- * \param width   Width of the region for which SAD is calculated.
- * \param height  Height of the region for which SAD is calculated.
- * \param stride  Width of the pixel array.
- *
- * \returns Sum of Absolute Differences
- */
-static unsigned reg_sad(const pixel * const data1, const pixel * const data2,
-                        const int width, const int height, const unsigned stride1, const unsigned stride2)
-{
-  int y, x;
-  unsigned sad = 0;
-
-  for (y = 0; y < height; ++y) {
-    for (x = 0; x < width; ++x) {
-      sad += abs(data1[y * stride1 + x] - data2[y * stride2 + x]);
-    }
-  }
-
-  return sad;
-}
-#endif
-
 /**
  * \brief  Handle special cases of comparing blocks that are not completely
  *         inside the frame.

src/strategies/picture-generic.c

@@ -0,0 +1,60 @@
+/*****************************************************************************
+ * This file is part of Kvazaar HEVC encoder.
+ *
+ * Copyright (C) 2013-2014 Tampere University of Technology and others (see
+ * COPYING file).
+ *
+ * Kvazaar is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * Kvazaar 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Kvazaar.  If not, see <http://www.gnu.org/licenses/>.
+ ****************************************************************************/
+
+/*
+ * \file
+ */
+
+#include <stdlib.h>
+
+#include "../strategyselector.h"
+
+
+/**
+ * \brief Calculate Sum of Absolute Differences (SAD)
+ *
+ * Calculate Sum of Absolute Differences (SAD) between two rectangular regions
+ * located in arbitrary points in the picture.
+ *
+ * \param data1   Starting point of the first picture.
+ * \param data2   Starting point of the second picture.
+ * \param width   Width of the region for which SAD is calculated.
+ * \param height  Height of the region for which SAD is calculated.
+ * \param stride  Width of the pixel array.
+ *
+ * \returns Sum of Absolute Differences
+ */
+static unsigned reg_sad_generic(const pixel * const data1, const pixel * const data2,
+                        const int width, const int height, const unsigned stride1, const unsigned stride2)
+{
+  int y, x;
+  unsigned sad = 0;
+
+  for (y = 0; y < height; ++y) {
+    for (x = 0; x < width; ++x) {
+      sad += abs(data1[y * stride1 + x] - data2[y * stride2 + x]);
+    }
+  }
+
+  return sad;
+}
+
+static int strategy_register_picture_generic(void* opaque) {
+  return strategyselector_register(opaque, "reg_sad", "generic", 0, &reg_sad_generic);
+}

src/strategies/picture-sse2.c

@@ -0,0 +1,56 @@
+/*****************************************************************************
+ * This file is part of Kvazaar HEVC encoder.
+ *
+ * Copyright (C) 2013-2014 Tampere University of Technology and others (see
+ * COPYING file).
+ *
+ * Kvazaar is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * Kvazaar 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Kvazaar.  If not, see <http://www.gnu.org/licenses/>.
+ ****************************************************************************/
+
+/*
+ * \file
+ */
+#include "../strategyselector.h"
+#include "../picture.h"
+#include <immintrin.h>
+#include <assert.h>
+
+__attribute__ ((__target__ ("sse2")))
+static unsigned reg_sad_sse2(const pixel * const data1, const pixel * const data2,
+                        const int width, const int height, const unsigned stride1, const unsigned stride2)
+{
+  int y, x;
+  unsigned sad = 0;
+  __m128i sse_inc = _mm_setzero_si128 ();
+  long long int sse_inc_array[2];
+  
+  for (y = 0; y < height; ++y) {
+    for (x = 0; x <= width-16; x+=16) {
+      const __m128i a = _mm_loadu_si128((__m128i const*) &data1[y * stride1 + x]);
+      const __m128i b = _mm_loadu_si128((__m128i const*) &data2[y * stride2 + x]);
+      sse_inc = _mm_add_epi32(sse_inc, _mm_sad_epu8(a,b));
+    }
+
+    for (; x < width; ++x) {
+      sad += abs(data1[y * stride1 + x] - data2[y * stride2 + x]);
+    }
+  }
+  _mm_storeu_si128((__m128i*) sse_inc_array, sse_inc);
+  sad += sse_inc_array[0] + sse_inc_array[1];
+
+  return sad;
+}
+
+static int strategy_register_picture_sse2(void* opaque) {
+  return strategyselector_register(opaque, "reg_sad", "sse2", 10, &reg_sad_sse2);
+}

src/strategies/picture-sse41.c

@@ -20,12 +20,13 @@
 /*
  * \file
  */
-
+#include "../strategyselector.h"
 #include "../picture.h"
 #include <immintrin.h>
+#include <assert.h>
 
-#ifdef __SSE2__
+__attribute__ ((__target__ ("sse2,sse4.1")))
-static unsigned reg_sad(const pixel * const data1, const pixel * const data2,
+static unsigned reg_sad_sse41(const pixel * const data1, const pixel * const data2,
                         const int width, const int height, const unsigned stride1, const unsigned stride2)
 {
   int y, x;
@@ -40,7 +41,6 @@ static unsigned reg_sad(const pixel * const data1, const pixel * const data2,
       sse_inc = _mm_add_epi32(sse_inc, _mm_sad_epu8(a,b));
     }
     
-#ifdef __SSE4_1__
     {
       const __m128i a = _mm_loadu_si128((__m128i const*) &data1[y * stride1 + x]);
       const __m128i b = _mm_loadu_si128((__m128i const*) &data2[y * stride2 + x]);
@@ -74,7 +74,6 @@ static unsigned reg_sad(const pixel * const data1, const pixel * const data2,
       }
       x = (width - (width%2));
     }
-#endif //__SSE4_1__
 
     for (; x < width; ++x) {
       sad += abs(data1[y * stride1 + x] - data2[y * stride2 + x]);
@@ -85,6 +84,7 @@ static unsigned reg_sad(const pixel * const data1, const pixel * const data2,
 
   return sad;
 }
-#else
+
-#error picture-sse2.c requires __SSE2__
+static int strategy_register_picture_sse41(void* opaque) {
-#endif //__SSE2__
+  return strategyselector_register(opaque, "reg_sad", "sse41", 20, &reg_sad_sse41);
+}

src/strategies/picture.c

@@ -0,0 +1,27 @@
+#include "picture-generic.c"
+#if COMPILE_INTEL_SSE2
+#include "picture-sse2.c"
+#endif
+#if COMPILE_INTEL_SSE2 && COMPILE_INTEL_SSE41
+#include "picture-sse41.c"
+#endif
+
+unsigned (*reg_sad)(const pixel * const data1, const pixel * const data2,
+                    const int width, const int height, const unsigned stride1, const unsigned stride2);
+
+
+static int strategy_register_picture(void* opaque) {
+  if (!strategy_register_picture_generic(opaque)) return 0;
+  
+  if (g_hardware_flags.intel_flags.sse2) {
+#if COMPILE_INTEL_SSE2
+    if (!strategy_register_picture_sse2(opaque)) return 0;
+#endif
+    if (g_hardware_flags.intel_flags.sse41) {
+#if COMPILE_INTEL_SSE2 && COMPILE_INTEL_SSE41
+      if (!strategy_register_picture_sse41(opaque)) return 0;
+#endif
+    }
+  }
+  return 1;
+}

src/strategies/picture.h

@@ -0,0 +1,30 @@
+#ifndef STRATEGIES_PICTURE_H_
+#define STRATEGIES_PICTURE_H_
+/*****************************************************************************
+ * This file is part of Kvazaar HEVC encoder.
+ *
+ * Copyright (C) 2013-2014 Tampere University of Technology and others (see
+ * COPYING file).
+ *
+ * Kvazaar is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * Kvazaar 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Kvazaar.  If not, see <http://www.gnu.org/licenses/>.
+ ****************************************************************************/
+
+#include "../picture.h"
+
+//Function pointer to reg_sad
+extern unsigned (*reg_sad)(const pixel * const data1, const pixel * const data2,
+                           const int width, const int height, const unsigned stride1, const unsigned stride2);
+
+#define STRATEGIES_PICTURE_EXPORTS {"reg_sad", (void**) &reg_sad}
+
+#endif //STRATEGIES_PICTURE_H_

src/strategyselector.c

@@ -0,0 +1,220 @@
+/*****************************************************************************
+ * This file is part of Kvazaar HEVC encoder.
+ *
+ * Copyright (C) 2013-2014 Tampere University of Technology and others (see
+ * COPYING file).
+ *
+ * Kvazaar is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * Kvazaar 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Kvazaar.  If not, see <http://www.gnu.org/licenses/>.
+ ****************************************************************************/
+
+/*
+ * \file
+ */
+
+#include <string.h>
+
+#include "strategyselector.h"
+
+hardware_flags g_hardware_flags;
+
+static void set_hardware_flags();
+static void* strategyselector_choose_for(const strategy_list * const strategies, const char * const strategy_type);
+
+//Strategies to include (add new file here)
+#include "strategies/picture.c"
+
+//Returns 1 if successful
+int strategyselector_init() {
+  const strategy_to_select *cur_strategy_to_select = strategies_to_select;
+  strategy_list strategies;
+  
+  strategies.allocated = 0;
+  strategies.count = 0;
+  strategies.strategies = NULL;
+  
+  set_hardware_flags();
+  
+  //Add new register function here
+  if (!strategy_register_picture(&strategies)) {
+    fprintf(stderr, "strategy_register_picture failed!\n");
+    return 0;
+  }
+  
+  while(cur_strategy_to_select->fptr) {
+    *(cur_strategy_to_select->fptr) = strategyselector_choose_for(&strategies, cur_strategy_to_select->strategy_type);
+    
+    if (!(*(cur_strategy_to_select->fptr))) {
+      fprintf(stderr, "Could not find a strategy for %s!\n", cur_strategy_to_select->strategy_type);
+      return 0;
+    }
+    ++cur_strategy_to_select;
+  }
+  
+  //We can free the structure now, as all strategies are statically set to pointers
+  if (strategies.allocated) {
+    free(strategies.strategies);
+  }
+
+  return 1;
+}
+
+void strategyselector_free() {
+  //Do nothing (yet)
+}
+
+//Returns 1 if successful, 0 otherwise
+int strategyselector_register(void * const opaque, const char * const type, const char * const strategy_name, int priority, void * const fptr) {
+  strategy_list * const strategies = opaque;
+  
+  if (strategies->allocated == strategies->count) {
+    strategy* new_strategies = realloc(strategies->strategies, sizeof(strategy) * (strategies->allocated + STRATEGY_LIST_ALLOC_SIZE));
+    if (!new_strategies) {
+      fprintf(stderr, "Could not increase strategies list size!\n");
+      return 0;
+    }
+    strategies->strategies = new_strategies;
+    strategies->allocated += STRATEGY_LIST_ALLOC_SIZE;
+  }
+  
+  {
+    strategy *new_strategy = &strategies->strategies[strategies->count++];
+    new_strategy->type = type;
+    new_strategy->strategy_name = strategy_name;
+    new_strategy->priority = priority;
+    new_strategy->fptr = fptr;
+  }
+#ifdef _DEBUG
+  fprintf(stderr, "Registered strategy %s:%s with priority %d (%p)\n", type, strategy_name, priority, fptr);
+#endif //_DEBUG
+  
+  return 1;
+}
+
+static void* strategyselector_choose_for(const strategy_list * const strategies, const char * const strategy_type) {
+  unsigned int max_priority = 0;
+  int max_priority_i = -1;
+  char buffer[256];
+  char *override = NULL;
+  int i = 0;
+  
+  snprintf(buffer, 255, "KVAZAAR_OVERRIDE_%s", strategy_type);
+  override = getenv(buffer);
+  
+  for (i=0; i < strategies->count; ++i) {
+    if (strcmp(strategies->strategies[i].type, strategy_type) == 0) {
+      if (override && strcmp(strategies->strategies[i].strategy_name, override) == 0) {
+        fprintf(stderr, "%s environment variable present, choosing %s:%s\n", buffer, strategy_type, strategies->strategies[i].strategy_name);
+        return strategies->strategies[i].fptr;
+      }
+      if (strategies->strategies[i].priority >= max_priority) {
+        max_priority_i = i;
+        max_priority = strategies->strategies[i].priority;
+      }
+    }
+  }
+  
+  if (override) {
+    fprintf(stderr, "%s environment variable present, but no strategy %s was found!\n", buffer, override);
+    return NULL;
+  }
+
+#ifdef _DEBUG
+  fprintf(stderr, "Choosing strategy for %s:\n", strategy_type);
+  for (i=0; i < strategies->count; ++i) {
+    if (strcmp(strategies->strategies[i].type, strategy_type) == 0) {
+      if (i != max_priority_i) {
+        fprintf(stderr, "- %s (%d, %p)\n", strategies->strategies[i].strategy_name, strategies->strategies[i].priority, strategies->strategies[i].fptr);
+      } else {
+        fprintf(stderr, "> %s (%d, %p)\n", strategies->strategies[i].strategy_name, strategies->strategies[i].priority, strategies->strategies[i].fptr);
+      }
+    }
+  }
+#endif //_DEBUG
+  
+  
+  if (max_priority_i == -1) {
+    return NULL;
+  }
+  
+  return strategies->strategies[max_priority_i].fptr;
+}
+
+#if COMPILE_INTEL
+#include "x86/cpu.h"
+#endif
+
+static void set_hardware_flags() {
+  memset(&g_hardware_flags, 0, sizeof(g_hardware_flags));
+  
+  g_hardware_flags.arm = COMPILE_ARM;
+  g_hardware_flags.intel = COMPILE_INTEL;
+  g_hardware_flags.powerpc = COMPILE_POWERPC;
+  
+#if COMPILE_INTEL
+  {
+    int ecx = 0,edx =0;
+    /* CPU feature bits */
+    enum { BIT_SSE3 = 0,BIT_SSSE3 = 9, BIT_SSE41 = 19, BIT_SSE42 = 20, BIT_MMX = 24, BIT_SSE = 25, BIT_SSE2 = 26, BIT_AVX = 28};
+
+    // Dig CPU features with cpuid
+    kvz_cpu_cpuid(&ecx,&edx);
+    
+    // EDX
+    if (edx & (1<<BIT_MMX))   g_hardware_flags.intel_flags.mmx = 1;
+    if (edx & (1<<BIT_SSE))   g_hardware_flags.intel_flags.sse = 1;
+    if (edx & (1<<BIT_SSE2))  g_hardware_flags.intel_flags.sse2 = 1;
+    // ECX
+    if (ecx & (1<<BIT_SSE3))  g_hardware_flags.intel_flags.sse3 = 1;;
+    if (ecx & (1<<BIT_SSSE3)) g_hardware_flags.intel_flags.ssse3 = 1;
+    if (ecx & (1<<BIT_SSE41)) g_hardware_flags.intel_flags.sse41 = 1;
+    if (ecx & (1<<BIT_SSE42)) g_hardware_flags.intel_flags.sse42 = 1;
+    if (ecx & (1<<BIT_AVX))   g_hardware_flags.intel_flags.avx = 1;
+    
+    fprintf(stderr, "Compiled: INTEL, flags:");
+#if COMPILE_INTEL_MMX
+    fprintf(stderr, " MMX");
+#endif
+#if COMPILE_INTEL_SSE
+    fprintf(stderr, " SSE");
+#endif
+#if COMPILE_INTEL_SSE2
+    fprintf(stderr, " SSE2");
+#endif
+#if COMPILE_INTEL_SSE3
+    fprintf(stderr, " SSE3");
+#endif
+#if COMPILE_INTEL_SSSE3
+    fprintf(stderr, " SSSE3");
+#endif
+#if COMPILE_INTEL_SSE41
+    fprintf(stderr, " SSE41");
+#endif
+#if COMPILE_INTEL_SSE42
+    fprintf(stderr, " SSE42");
+#endif
+#if COMPILE_INTEL_AVX
+    fprintf(stderr, " AVX");
+#endif
+    fprintf(stderr, "\nRun on  : INTEL, flags:");
+    if (g_hardware_flags.intel_flags.mmx) fprintf(stderr, " MMX");
+    if (g_hardware_flags.intel_flags.sse) fprintf(stderr, " SSE");
+    if (g_hardware_flags.intel_flags.sse2) fprintf(stderr, " SSE2");
+    if (g_hardware_flags.intel_flags.sse3) fprintf(stderr, " SSE3");
+    if (g_hardware_flags.intel_flags.ssse3) fprintf(stderr, " SSSE3");
+    if (g_hardware_flags.intel_flags.sse41) fprintf(stderr, " SSE41");
+    if (g_hardware_flags.intel_flags.sse42) fprintf(stderr, " SSE42");
+    if (g_hardware_flags.intel_flags.avx) fprintf(stderr, " AVX");
+    fprintf(stderr, "\n");
+  }
+#endif //COMPILE_INTEL
+}

src/strategyselector.h

@@ -0,0 +1,141 @@
+#ifndef STRATEGYSELECTOR_H_
+#define STRATEGYSELECTOR_H_
+/*****************************************************************************
+ * This file is part of Kvazaar HEVC encoder.
+ *
+ * Copyright (C) 2013-2014 Tampere University of Technology and others (see
+ * COPYING file).
+ *
+ * Kvazaar is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * Kvazaar 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Kvazaar.  If not, see <http://www.gnu.org/licenses/>.
+ ****************************************************************************/
+
+//Hardware data (abstraction of defines). Extend for other compilers
+
+#if defined(_M_IX86) || defined(__i586__) || defined(__i686__) || defined(_M_X64) || defined(_M_AMD64) || defined(__amd64__) || defined(__x86_64__)
+#define COMPILE_INTEL 1
+
+#if defined(__MMX__)
+#define COMPILE_INTEL_MMX 1
+#endif
+
+#if defined(__SSE__)
+#define COMPILE_INTEL_SSE 1
+#endif
+    
+#if defined(__SSE2__)
+#define COMPILE_INTEL_SSE2 1
+#endif
+
+#if defined(__SSE3__)
+#define COMPILE_INTEL_SSE3 1
+#endif
+
+#if defined(__SSSE3__)
+#define COMPILE_INTEL_SSSE3 1
+#endif
+
+#if defined(__SSE4_1__)
+#define COMPILE_INTEL_SSE41 1
+#endif
+
+#if defined(__SSE4_2__)
+#define COMPILE_INTEL_SSE42 1
+#endif
+
+#if defined(__AVX__)
+#define COMPILE_INTEL_AVX 1
+#endif
+
+#else
+#define COMPILE_INTEL 0
+#endif
+
+#if defined (_M_PPC) || defined(__powerpc64__) || defined(__powerpc__)
+#define COMPILE_POWERPC 1
+#else
+#define COMPILE_POWERPC 0
+#endif
+
+#if defined (_M_ARM) || defined(__arm__) || defined(__thumb__)
+#define COMPILE_ARM 1
+#else
+#define COMPILE_ARM 0
+#endif
+
+
+
+typedef struct {
+  const char *type; //Type of the function, usually its name
+  const char *strategy_name; //Name of the strategy (e.g. sse2)
+  unsigned int priority; //Priority. 0 = lowest (default strategy)
+  void *fptr; //Pointer to the function
+} strategy;
+
+typedef struct {
+  unsigned int count;
+  unsigned int allocated;
+  strategy* strategies;
+} strategy_list;
+
+#define STRATEGY_LIST_ALLOC_SIZE 16
+
+typedef struct {
+  const char *strategy_type;
+  void **fptr;
+} strategy_to_select;
+
+typedef struct {
+  int intel;
+  struct {
+    int mmx;
+    int sse;
+    int sse2;
+    int sse3;
+    int ssse3;
+    int sse41;
+    int sse42;
+    int avx;
+  } intel_flags;
+  
+  int powerpc;
+  struct {
+    int altivec;
+  } powerpc_flags;
+  
+  int arm;
+  struct {
+    int neon;
+  } arm_flags;
+} hardware_flags;
+
+extern hardware_flags g_hardware_flags;
+
+
+int strategyselector_init();
+void strategyselector_free();
+int strategyselector_register(void *opaque, const char *type, const char *strategy_name, int priority, void *fptr);
+
+
+//Strategy to include
+#include "strategies/picture.h"
+
+static const strategy_to_select strategies_to_select[] = {
+  STRATEGIES_PICTURE_EXPORTS,
+  {NULL, NULL},
+};
+
+
+
+
+
+#endif //STRATEGYSELECTOR_H_