libvpx: Add VP9 decoder.

source/libvpx/vpx_ports/arm_cpudetect.c.orig

Index: source/libvpx/vpx_ports/arm_cpudetect.c.orig
===================================================================
--- source/libvpx/vpx_ports/arm_cpudetect.c.orig	(revision 0)
+++ source/libvpx/vpx_ports/arm_cpudetect.c.orig	(revision 0)
@@ -0,0 +1,219 @@
+/*
+ *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include "arm.h"
+
+static int arm_cpu_env_flags(int *flags)
+{
+    char *env;
+    env = getenv("VPX_SIMD_CAPS");
+    if (env && *env)
+    {
+        *flags = (int)strtol(env, NULL, 0);
+        return 0;
+    }
+    *flags = 0;
+    return -1;
+}
+
+static int arm_cpu_env_mask(void)
+{
+    char *env;
+    env = getenv("VPX_SIMD_CAPS_MASK");
+    return env && *env ? (int)strtol(env, NULL, 0) : ~0;
+}
+
+#if !CONFIG_RUNTIME_CPU_DETECT
+
+int arm_cpu_caps(void)
+{
+  /* This function should actually be a no-op. There is no way to adjust any of
+   * these because the RTCD tables do not exist: the functions are called
+   * statically */
+    int flags;
+    int mask;
+    if (!arm_cpu_env_flags(&flags))
+    {
+        return flags;
+    }
+    mask = arm_cpu_env_mask();
+#if HAVE_EDSP
+    flags |= HAS_EDSP;
+#endif /* HAVE_EDSP */
+#if HAVE_MEDIA
+    flags |= HAS_MEDIA;
+#endif /* HAVE_MEDIA */
+#if HAVE_NEON
+    flags |= HAS_NEON;
+#endif /* HAVE_NEON */
+    return flags & mask;
+}
+
+#elif defined(_MSC_VER) /* end !CONFIG_RUNTIME_CPU_DETECT */
+/*For GetExceptionCode() and EXCEPTION_ILLEGAL_INSTRUCTION.*/
+#define WIN32_LEAN_AND_MEAN
+#define WIN32_EXTRA_LEAN
+#include <windows.h>
+
+int arm_cpu_caps(void)
+{
+    int flags;
+    int mask;
+    if (!arm_cpu_env_flags(&flags))
+    {
+        return flags;
+    }
+    mask = arm_cpu_env_mask();
+    /* MSVC has no inline __asm support for ARM, but it does let you __emit
+     *  instructions via their assembled hex code.
+     * All of these instructions should be essentially nops.
+     */
+#if HAVE_EDSP
+    if (mask & HAS_EDSP)
+    {
+        __try
+        {
+            /*PLD [r13]*/
+            __emit(0xF5DDF000);
+            flags |= HAS_EDSP;
+        }
+        __except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION)
+        {
+            /*Ignore exception.*/
+        }
+    }
+#if HAVE_MEDIA
+    if (mask & HAS_MEDIA)
+        __try
+        {
+            /*SHADD8 r3,r3,r3*/
+            __emit(0xE6333F93);
+            flags |= HAS_MEDIA;
+        }
+        __except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION)
+        {
+            /*Ignore exception.*/
+        }
+    }
+#if HAVE_NEON
+    if (mask & HAS_NEON)
+    {
+        __try
+        {
+            /*VORR q0,q0,q0*/
+            __emit(0xF2200150);
+            flags |= HAS_NEON;
+        }
+        __except(GetExceptionCode() == EXCEPTION_ILLEGAL_INSTRUCTION)
+        {
+            /*Ignore exception.*/
+        }
+    }
+#endif /* HAVE_NEON */
+#endif /* HAVE_MEDIA */
+#endif /* HAVE_EDSP */
+    return flags & mask;
+}
+
+#elif defined(__ANDROID__) /* end _MSC_VER */
+#include <cpu-features.h>
+
+int arm_cpu_caps(void)
+{
+    int flags;
+    int mask;
+    uint64_t features;
+    if (!arm_cpu_env_flags(&flags))
+    {
+        return flags;
+    }
+    mask = arm_cpu_env_mask();
+    features = android_getCpuFeatures();
+
+#if HAVE_EDSP
+    flags |= HAS_EDSP;
+#endif /* HAVE_EDSP */
+#if HAVE_MEDIA
+    flags |= HAS_MEDIA;
+#endif /* HAVE_MEDIA */
+#if HAVE_NEON
+    if (features & ANDROID_CPU_ARM_FEATURE_NEON)
+        flags |= HAS_NEON;
+#endif /* HAVE_NEON */
+    return flags & mask;
+}
+
+#elif defined(__linux__) /* end __ANDROID__ */
+#include <stdio.h>
+
+int arm_cpu_caps(void)
+{
+    FILE *fin;
+    int flags;
+    int mask;
+    if (!arm_cpu_env_flags(&flags))
+    {
+        return flags;
+    }
+    mask = arm_cpu_env_mask();
+    /* Reading /proc/self/auxv would be easier, but that doesn't work reliably
+     *  on Android.
+     * This also means that detection will fail in Scratchbox.
+     */
+    fin = fopen("/proc/cpuinfo","r");
+    if(fin != NULL)
+    {
+        /* 512 should be enough for anybody (it's even enough for all the flags
+         * that x86 has accumulated... so far).
+         */
+        char buf[512];
+        while (fgets(buf, 511, fin) != NULL)
+        {
+#if HAVE_EDSP || HAVE_NEON
+            if (memcmp(buf, "Features", 8) == 0)
+            {
+                char *p;
+#if HAVE_EDSP
+                p=strstr(buf, " edsp");
+                if (p != NULL && (p[5] == ' ' || p[5] == '\n'))
+                {
+                    flags |= HAS_EDSP;
+                }
+#if HAVE_NEON
+                p = strstr(buf, " neon");
+                if (p != NULL && (p[5] == ' ' || p[5] == '\n'))
+                {
+                    flags |= HAS_NEON;
+                }
+#endif /* HAVE_NEON */
+#endif /* HAVE_EDSP */
+            }
+#endif /* HAVE_EDSP || HAVE_NEON */
+#if HAVE_MEDIA
+            if (memcmp(buf, "CPU architecture:",17) == 0){
+                int version;
+                version = atoi(buf+17);
+                if (version >= 6)
+                {
+                    flags |= HAS_MEDIA;
+                }
+            }
+#endif /* HAVE_MEDIA */
+        }
+        fclose(fin);
+    }
+    return flags & mask;
+}
+#else /* end __linux__ */
+#error "--enable-runtime-cpu-detect selected, but no CPU detection method " \
+ "available for your platform. Reconfigure with --disable-runtime-cpu-detect."
+#endif