Port folder renaming changes from AOM
Manually cherry-picked commits:
ceef058 libvpx->libaom part2
3d26d91 libvpx -> libaom
cfea7dd vp10/ -> av1/
3a8eff7 Fix a build issue for a test
bf4202e Rename vpx to aom
Change-Id: I1b0eb5a40796e3aaf41c58984b4229a439a597dc
diff --git a/aom_util/debug_util.c b/aom_util/debug_util.c
new file mode 100644
index 0000000..5fe88db
--- /dev/null
+++ b/aom_util/debug_util.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2016 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 "aom_util/debug_util.h"
+#include <assert.h>
+#include <stdio.h>
+#if CONFIG_BITSTREAM_DEBUG
+#define QUEUE_MAX_SIZE 2000000
+static int result_queue[QUEUE_MAX_SIZE];
+static int prob_queue[QUEUE_MAX_SIZE];
+static int queue_r = 0;
+static int queue_w = 0;
+static int queue_prev_w = -1;
+static int skip_r = 0;
+static int skip_w = 0;
+
+void bitstream_queue_set_skip_write(int skip) { skip_w = skip; }
+
+void bitstream_queue_set_skip_read(int skip) { skip_r = skip; }
+
+void bitstream_queue_record_write(void) { queue_prev_w = queue_w; }
+
+void bitstream_queue_reset_write(void) { queue_w = queue_prev_w; }
+
+int bitstream_queue_get_write(void) { return queue_w; }
+
+int bitstream_queue_get_read(void) { return queue_r; }
+
+void bitstream_queue_pop(int *result, int *prob) {
+ if (!skip_r) {
+ if (queue_w == queue_r) {
+ printf("buffer underflow queue_w %d queue_r %d\n", queue_w, queue_r);
+ assert(0);
+ }
+ *result = result_queue[queue_r];
+ *prob = prob_queue[queue_r];
+ queue_r = (queue_r + 1) % QUEUE_MAX_SIZE;
+ }
+}
+
+void bitstream_queue_push(int result, int prob) {
+ if (!skip_w) {
+ result_queue[queue_w] = result;
+ prob_queue[queue_w] = prob;
+ queue_w = (queue_w + 1) % QUEUE_MAX_SIZE;
+ if (queue_w == queue_r) {
+ printf("buffer overflow queue_w %d queue_r %d\n", queue_w, queue_r);
+ assert(0);
+ }
+ }
+}
+#endif // CONFIG_BITSTREAM_DEBUG
diff --git a/aom_util/debug_util.h b/aom_util/debug_util.h
new file mode 100644
index 0000000..0438be4
--- /dev/null
+++ b/aom_util/debug_util.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2016 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.
+ */
+
+#ifndef VPX_UTIL_DEBUG_UTIL_H_
+#define VPX_UTIL_DEBUG_UTIL_H_
+
+#include "./vpx_config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#if CONFIG_BITSTREAM_DEBUG
+/* This is a debug tool used to detect bitstream error. On encoder side, it
+ * pushes each bit and probability into a queue before the bit is written into
+ * the Arithmetic coder. On decoder side, whenever a bit is read out from the
+ * Arithmetic coder, it pops out the reference bit and probability from the
+ * queue as well. If the two results do not match, this debug tool will report
+ * an error. This tool can be used to pin down the bitstream error precisely.
+ * By combining gdb's backtrace method, we can detect which module causes the
+ * bitstream error. */
+int bitstream_queue_get_write(void);
+int bitstream_queue_get_read(void);
+void bitstream_queue_record_write(void);
+void bitstream_queue_reset_write(void);
+void bitstream_queue_pop(int *result, int *prob);
+void bitstream_queue_push(int result, int prob);
+void bitstream_queue_set_skip_write(int skip);
+void bitstream_queue_set_skip_read(int skip);
+#endif // CONFIG_BITSTREAM_DEBUG
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // VPX_UTIL_DEBUG_UTIL_H_
diff --git a/aom_util/endian_inl.h b/aom_util/endian_inl.h
new file mode 100644
index 0000000..36b8138
--- /dev/null
+++ b/aom_util/endian_inl.h
@@ -0,0 +1,118 @@
+// Copyright 2014 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING 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.
+// -----------------------------------------------------------------------------
+//
+// Endian related functions.
+
+#ifndef VPX_UTIL_ENDIAN_INL_H_
+#define VPX_UTIL_ENDIAN_INL_H_
+
+#include <stdlib.h>
+#include "./vpx_config.h"
+#include "aom/vpx_integer.h"
+
+#if defined(__GNUC__)
+#define LOCAL_GCC_VERSION ((__GNUC__ << 8) | __GNUC_MINOR__)
+#define LOCAL_GCC_PREREQ(maj, min) (LOCAL_GCC_VERSION >= (((maj) << 8) | (min)))
+#else
+#define LOCAL_GCC_VERSION 0
+#define LOCAL_GCC_PREREQ(maj, min) 0
+#endif
+
+// handle clang compatibility
+#ifndef __has_builtin
+#define __has_builtin(x) 0
+#endif
+
+// some endian fix (e.g.: mips-gcc doesn't define __BIG_ENDIAN__)
+#if !defined(WORDS_BIGENDIAN) && \
+ (defined(__BIG_ENDIAN__) || defined(_M_PPC) || \
+ (defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)))
+#define WORDS_BIGENDIAN
+#endif
+
+#if defined(WORDS_BIGENDIAN)
+#define HToLE32 BSwap32
+#define HToLE16 BSwap16
+#define HToBE64(x) (x)
+#define HToBE32(x) (x)
+#else
+#define HToLE32(x) (x)
+#define HToLE16(x) (x)
+#define HToBE64(X) BSwap64(X)
+#define HToBE32(X) BSwap32(X)
+#endif
+
+#if LOCAL_GCC_PREREQ(4, 8) || __has_builtin(__builtin_bswap16)
+#define HAVE_BUILTIN_BSWAP16
+#endif
+
+#if LOCAL_GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap32)
+#define HAVE_BUILTIN_BSWAP32
+#endif
+
+#if LOCAL_GCC_PREREQ(4, 3) || __has_builtin(__builtin_bswap64)
+#define HAVE_BUILTIN_BSWAP64
+#endif
+
+#if HAVE_MIPS32 && defined(__mips__) && !defined(__mips64) && \
+ defined(__mips_isa_rev) && (__mips_isa_rev >= 2) && (__mips_isa_rev < 6)
+#define VPX_USE_MIPS32_R2
+#endif
+
+static INLINE uint16_t BSwap16(uint16_t x) {
+#if defined(HAVE_BUILTIN_BSWAP16)
+ return __builtin_bswap16(x);
+#elif defined(_MSC_VER)
+ return _byteswap_ushort(x);
+#else
+ // gcc will recognize a 'rorw $8, ...' here:
+ return (x >> 8) | ((x & 0xff) << 8);
+#endif // HAVE_BUILTIN_BSWAP16
+}
+
+static INLINE uint32_t BSwap32(uint32_t x) {
+#if defined(VPX_USE_MIPS32_R2)
+ uint32_t ret;
+ __asm__ volatile(
+ "wsbh %[ret], %[x] \n\t"
+ "rotr %[ret], %[ret], 16 \n\t"
+ : [ret] "=r"(ret)
+ : [x] "r"(x));
+ return ret;
+#elif defined(HAVE_BUILTIN_BSWAP32)
+ return __builtin_bswap32(x);
+#elif defined(__i386__) || defined(__x86_64__)
+ uint32_t swapped_bytes;
+ __asm__ volatile("bswap %0" : "=r"(swapped_bytes) : "0"(x));
+ return swapped_bytes;
+#elif defined(_MSC_VER)
+ return (uint32_t)_byteswap_ulong(x);
+#else
+ return (x >> 24) | ((x >> 8) & 0xff00) | ((x << 8) & 0xff0000) | (x << 24);
+#endif // HAVE_BUILTIN_BSWAP32
+}
+
+static INLINE uint64_t BSwap64(uint64_t x) {
+#if defined(HAVE_BUILTIN_BSWAP64)
+ return __builtin_bswap64(x);
+#elif defined(__x86_64__)
+ uint64_t swapped_bytes;
+ __asm__ volatile("bswapq %0" : "=r"(swapped_bytes) : "0"(x));
+ return swapped_bytes;
+#elif defined(_MSC_VER)
+ return (uint64_t)_byteswap_uint64(x);
+#else // generic code for swapping 64-bit values (suggested by bdb@)
+ x = ((x & 0xffffffff00000000ull) >> 32) | ((x & 0x00000000ffffffffull) << 32);
+ x = ((x & 0xffff0000ffff0000ull) >> 16) | ((x & 0x0000ffff0000ffffull) << 16);
+ x = ((x & 0xff00ff00ff00ff00ull) >> 8) | ((x & 0x00ff00ff00ff00ffull) << 8);
+ return x;
+#endif // HAVE_BUILTIN_BSWAP64
+}
+
+#endif // VPX_UTIL_ENDIAN_INL_H_
diff --git a/aom_util/vpx_thread.c b/aom_util/vpx_thread.c
new file mode 100644
index 0000000..01930b6
--- /dev/null
+++ b/aom_util/vpx_thread.c
@@ -0,0 +1,181 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING 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.
+// -----------------------------------------------------------------------------
+//
+// Multi-threaded worker
+//
+// Original source:
+// https://chromium.googlesource.com/webm/libwebp
+
+#include <assert.h>
+#include <string.h> // for memset()
+#include "./vpx_thread.h"
+#include "aom_mem/vpx_mem.h"
+
+#if CONFIG_MULTITHREAD
+
+struct VPxWorkerImpl {
+ pthread_mutex_t mutex_;
+ pthread_cond_t condition_;
+ pthread_t thread_;
+};
+
+//------------------------------------------------------------------------------
+
+static void execute(VPxWorker *const worker); // Forward declaration.
+
+static THREADFN thread_loop(void *ptr) {
+ VPxWorker *const worker = (VPxWorker *)ptr;
+ int done = 0;
+ while (!done) {
+ pthread_mutex_lock(&worker->impl_->mutex_);
+ while (worker->status_ == OK) { // wait in idling mode
+ pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
+ }
+ if (worker->status_ == WORK) {
+ execute(worker);
+ worker->status_ = OK;
+ } else if (worker->status_ == NOT_OK) { // finish the worker
+ done = 1;
+ }
+ // signal to the main thread that we're done (for sync())
+ pthread_cond_signal(&worker->impl_->condition_);
+ pthread_mutex_unlock(&worker->impl_->mutex_);
+ }
+ return THREAD_RETURN(NULL); // Thread is finished
+}
+
+// main thread state control
+static void change_state(VPxWorker *const worker, VPxWorkerStatus new_status) {
+ // No-op when attempting to change state on a thread that didn't come up.
+ // Checking status_ without acquiring the lock first would result in a data
+ // race.
+ if (worker->impl_ == NULL) return;
+
+ pthread_mutex_lock(&worker->impl_->mutex_);
+ if (worker->status_ >= OK) {
+ // wait for the worker to finish
+ while (worker->status_ != OK) {
+ pthread_cond_wait(&worker->impl_->condition_, &worker->impl_->mutex_);
+ }
+ // assign new status and release the working thread if needed
+ if (new_status != OK) {
+ worker->status_ = new_status;
+ pthread_cond_signal(&worker->impl_->condition_);
+ }
+ }
+ pthread_mutex_unlock(&worker->impl_->mutex_);
+}
+
+#endif // CONFIG_MULTITHREAD
+
+//------------------------------------------------------------------------------
+
+static void init(VPxWorker *const worker) {
+ memset(worker, 0, sizeof(*worker));
+ worker->status_ = NOT_OK;
+}
+
+static int sync(VPxWorker *const worker) {
+#if CONFIG_MULTITHREAD
+ change_state(worker, OK);
+#endif
+ assert(worker->status_ <= OK);
+ return !worker->had_error;
+}
+
+static int reset(VPxWorker *const worker) {
+ int ok = 1;
+ worker->had_error = 0;
+ if (worker->status_ < OK) {
+#if CONFIG_MULTITHREAD
+ worker->impl_ = (VPxWorkerImpl *)vpx_calloc(1, sizeof(*worker->impl_));
+ if (worker->impl_ == NULL) {
+ return 0;
+ }
+ if (pthread_mutex_init(&worker->impl_->mutex_, NULL)) {
+ goto Error;
+ }
+ if (pthread_cond_init(&worker->impl_->condition_, NULL)) {
+ pthread_mutex_destroy(&worker->impl_->mutex_);
+ goto Error;
+ }
+ pthread_mutex_lock(&worker->impl_->mutex_);
+ ok = !pthread_create(&worker->impl_->thread_, NULL, thread_loop, worker);
+ if (ok) worker->status_ = OK;
+ pthread_mutex_unlock(&worker->impl_->mutex_);
+ if (!ok) {
+ pthread_mutex_destroy(&worker->impl_->mutex_);
+ pthread_cond_destroy(&worker->impl_->condition_);
+ Error:
+ vpx_free(worker->impl_);
+ worker->impl_ = NULL;
+ return 0;
+ }
+#else
+ worker->status_ = OK;
+#endif
+ } else if (worker->status_ > OK) {
+ ok = sync(worker);
+ }
+ assert(!ok || (worker->status_ == OK));
+ return ok;
+}
+
+static void execute(VPxWorker *const worker) {
+ if (worker->hook != NULL) {
+ worker->had_error |= !worker->hook(worker->data1, worker->data2);
+ }
+}
+
+static void launch(VPxWorker *const worker) {
+#if CONFIG_MULTITHREAD
+ change_state(worker, WORK);
+#else
+ execute(worker);
+#endif
+}
+
+static void end(VPxWorker *const worker) {
+#if CONFIG_MULTITHREAD
+ if (worker->impl_ != NULL) {
+ change_state(worker, NOT_OK);
+ pthread_join(worker->impl_->thread_, NULL);
+ pthread_mutex_destroy(&worker->impl_->mutex_);
+ pthread_cond_destroy(&worker->impl_->condition_);
+ vpx_free(worker->impl_);
+ worker->impl_ = NULL;
+ }
+#else
+ worker->status_ = NOT_OK;
+ assert(worker->impl_ == NULL);
+#endif
+ assert(worker->status_ == NOT_OK);
+}
+
+//------------------------------------------------------------------------------
+
+static VPxWorkerInterface g_worker_interface = { init, reset, sync,
+ launch, execute, end };
+
+int vpx_set_worker_interface(const VPxWorkerInterface *const winterface) {
+ if (winterface == NULL || winterface->init == NULL ||
+ winterface->reset == NULL || winterface->sync == NULL ||
+ winterface->launch == NULL || winterface->execute == NULL ||
+ winterface->end == NULL) {
+ return 0;
+ }
+ g_worker_interface = *winterface;
+ return 1;
+}
+
+const VPxWorkerInterface *vpx_get_worker_interface(void) {
+ return &g_worker_interface;
+}
+
+//------------------------------------------------------------------------------
diff --git a/aom_util/vpx_thread.h b/aom_util/vpx_thread.h
new file mode 100644
index 0000000..3b852b2
--- /dev/null
+++ b/aom_util/vpx_thread.h
@@ -0,0 +1,410 @@
+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the COPYING 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.
+// -----------------------------------------------------------------------------
+//
+// Multi-threaded worker
+//
+// Original source:
+// https://chromium.googlesource.com/webm/libwebp
+
+#ifndef VPX_THREAD_H_
+#define VPX_THREAD_H_
+
+#include "./vpx_config.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Set maximum decode threads to be 8 due to the limit of frame buffers
+// and not enough semaphores in the emulation layer on windows.
+#define MAX_DECODE_THREADS 8
+
+#if CONFIG_MULTITHREAD
+
+#if defined(_WIN32) && !HAVE_PTHREAD_H
+#include <errno.h> // NOLINT
+#include <process.h> // NOLINT
+#include <windows.h> // NOLINT
+typedef HANDLE pthread_t;
+typedef CRITICAL_SECTION pthread_mutex_t;
+
+#if _WIN32_WINNT >= 0x0600 // Windows Vista / Server 2008 or greater
+#define USE_WINDOWS_CONDITION_VARIABLE
+typedef CONDITION_VARIABLE pthread_cond_t;
+#else
+typedef struct {
+ HANDLE waiting_sem_;
+ HANDLE received_sem_;
+ HANDLE signal_event_;
+} pthread_cond_t;
+#endif // _WIN32_WINNT >= 0x600
+
+#ifndef WINAPI_FAMILY_PARTITION
+#define WINAPI_PARTITION_DESKTOP 1
+#define WINAPI_FAMILY_PARTITION(x) x
+#endif
+
+#if !WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
+#define USE_CREATE_THREAD
+#endif
+
+//------------------------------------------------------------------------------
+// simplistic pthread emulation layer
+
+// _beginthreadex requires __stdcall
+#define THREADFN unsigned int __stdcall
+#define THREAD_RETURN(val) (unsigned int)((DWORD_PTR)val)
+
+#if _WIN32_WINNT >= 0x0501 // Windows XP or greater
+#define WaitForSingleObject(obj, timeout) \
+ WaitForSingleObjectEx(obj, timeout, FALSE /*bAlertable*/)
+#endif
+
+static INLINE int pthread_create(pthread_t *const thread, const void *attr,
+ unsigned int(__stdcall *start)(void *),
+ void *arg) {
+ (void)attr;
+#ifdef USE_CREATE_THREAD
+ *thread = CreateThread(NULL, /* lpThreadAttributes */
+ 0, /* dwStackSize */
+ start, arg, 0, /* dwStackSize */
+ NULL); /* lpThreadId */
+#else
+ *thread = (pthread_t)_beginthreadex(NULL, /* void *security */
+ 0, /* unsigned stack_size */
+ start, arg, 0, /* unsigned initflag */
+ NULL); /* unsigned *thrdaddr */
+#endif
+ if (*thread == NULL) return 1;
+ SetThreadPriority(*thread, THREAD_PRIORITY_ABOVE_NORMAL);
+ return 0;
+}
+
+static INLINE int pthread_join(pthread_t thread, void **value_ptr) {
+ (void)value_ptr;
+ return (WaitForSingleObject(thread, INFINITE) != WAIT_OBJECT_0 ||
+ CloseHandle(thread) == 0);
+}
+
+// Mutex
+static INLINE int pthread_mutex_init(pthread_mutex_t *const mutex,
+ void *mutexattr) {
+ (void)mutexattr;
+#if _WIN32_WINNT >= 0x0600 // Windows Vista / Server 2008 or greater
+ InitializeCriticalSectionEx(mutex, 0 /*dwSpinCount*/, 0 /*Flags*/);
+#else
+ InitializeCriticalSection(mutex);
+#endif
+ return 0;
+}
+
+static INLINE int pthread_mutex_trylock(pthread_mutex_t *const mutex) {
+ return TryEnterCriticalSection(mutex) ? 0 : EBUSY;
+}
+
+static INLINE int pthread_mutex_lock(pthread_mutex_t *const mutex) {
+ EnterCriticalSection(mutex);
+ return 0;
+}
+
+static INLINE int pthread_mutex_unlock(pthread_mutex_t *const mutex) {
+ LeaveCriticalSection(mutex);
+ return 0;
+}
+
+static INLINE int pthread_mutex_destroy(pthread_mutex_t *const mutex) {
+ DeleteCriticalSection(mutex);
+ return 0;
+}
+
+// Condition
+static INLINE int pthread_cond_destroy(pthread_cond_t *const condition) {
+ int ok = 1;
+#ifdef USE_WINDOWS_CONDITION_VARIABLE
+ (void)condition;
+#else
+ ok &= (CloseHandle(condition->waiting_sem_) != 0);
+ ok &= (CloseHandle(condition->received_sem_) != 0);
+ ok &= (CloseHandle(condition->signal_event_) != 0);
+#endif
+ return !ok;
+}
+
+static INLINE int pthread_cond_init(pthread_cond_t *const condition,
+ void *cond_attr) {
+ (void)cond_attr;
+#ifdef USE_WINDOWS_CONDITION_VARIABLE
+ InitializeConditionVariable(condition);
+#else
+ condition->waiting_sem_ = CreateSemaphore(NULL, 0, MAX_DECODE_THREADS, NULL);
+ condition->received_sem_ = CreateSemaphore(NULL, 0, MAX_DECODE_THREADS, NULL);
+ condition->signal_event_ = CreateEvent(NULL, FALSE, FALSE, NULL);
+ if (condition->waiting_sem_ == NULL || condition->received_sem_ == NULL ||
+ condition->signal_event_ == NULL) {
+ pthread_cond_destroy(condition);
+ return 1;
+ }
+#endif
+ return 0;
+}
+
+static INLINE int pthread_cond_signal(pthread_cond_t *const condition) {
+ int ok = 1;
+#ifdef USE_WINDOWS_CONDITION_VARIABLE
+ WakeConditionVariable(condition);
+#else
+ if (WaitForSingleObject(condition->waiting_sem_, 0) == WAIT_OBJECT_0) {
+ // a thread is waiting in pthread_cond_wait: allow it to be notified
+ ok = SetEvent(condition->signal_event_);
+ // wait until the event is consumed so the signaler cannot consume
+ // the event via its own pthread_cond_wait.
+ ok &= (WaitForSingleObject(condition->received_sem_, INFINITE) !=
+ WAIT_OBJECT_0);
+ }
+#endif
+ return !ok;
+}
+
+static INLINE int pthread_cond_wait(pthread_cond_t *const condition,
+ pthread_mutex_t *const mutex) {
+ int ok;
+#ifdef USE_WINDOWS_CONDITION_VARIABLE
+ ok = SleepConditionVariableCS(condition, mutex, INFINITE);
+#else
+ // note that there is a consumer available so the signal isn't dropped in
+ // pthread_cond_signal
+ if (!ReleaseSemaphore(condition->waiting_sem_, 1, NULL)) return 1;
+ // now unlock the mutex so pthread_cond_signal may be issued
+ pthread_mutex_unlock(mutex);
+ ok = (WaitForSingleObject(condition->signal_event_, INFINITE) ==
+ WAIT_OBJECT_0);
+ ok &= ReleaseSemaphore(condition->received_sem_, 1, NULL);
+ pthread_mutex_lock(mutex);
+#endif
+ return !ok;
+}
+#elif defined(__OS2__)
+#define INCL_DOS
+#include <os2.h> // NOLINT
+
+#include <errno.h> // NOLINT
+#include <stdlib.h> // NOLINT
+#include <sys/builtin.h> // NOLINT
+
+#define pthread_t TID
+#define pthread_mutex_t HMTX
+
+typedef struct {
+ HEV event_sem_;
+ HEV ack_sem_;
+ volatile unsigned wait_count_;
+} pthread_cond_t;
+
+//------------------------------------------------------------------------------
+// simplistic pthread emulation layer
+
+#define THREADFN void *
+#define THREAD_RETURN(val) (val)
+
+typedef struct {
+ void *(*start_)(void *);
+ void *arg_;
+} thread_arg;
+
+static void thread_start(void *arg) {
+ thread_arg targ = *(thread_arg *)arg;
+ free(arg);
+
+ targ.start_(targ.arg_);
+}
+
+static INLINE int pthread_create(pthread_t *const thread, const void *attr,
+ void *(*start)(void *), void *arg) {
+ int tid;
+ thread_arg *targ = (thread_arg *)malloc(sizeof(*targ));
+ if (targ == NULL) return 1;
+
+ (void)attr;
+
+ targ->start_ = start;
+ targ->arg_ = arg;
+ tid = (pthread_t)_beginthread(thread_start, NULL, 1024 * 1024, targ);
+ if (tid == -1) {
+ free(targ);
+ return 1;
+ }
+
+ *thread = tid;
+ return 0;
+}
+
+static INLINE int pthread_join(pthread_t thread, void **value_ptr) {
+ (void)value_ptr;
+ return DosWaitThread(&thread, DCWW_WAIT) != 0;
+}
+
+// Mutex
+static INLINE int pthread_mutex_init(pthread_mutex_t *const mutex,
+ void *mutexattr) {
+ (void)mutexattr;
+ return DosCreateMutexSem(NULL, mutex, 0, FALSE) != 0;
+}
+
+static INLINE int pthread_mutex_trylock(pthread_mutex_t *const mutex) {
+ return DosRequestMutexSem(*mutex, SEM_IMMEDIATE_RETURN) == 0 ? 0 : EBUSY;
+}
+
+static INLINE int pthread_mutex_lock(pthread_mutex_t *const mutex) {
+ return DosRequestMutexSem(*mutex, SEM_INDEFINITE_WAIT) != 0;
+}
+
+static INLINE int pthread_mutex_unlock(pthread_mutex_t *const mutex) {
+ return DosReleaseMutexSem(*mutex) != 0;
+}
+
+static INLINE int pthread_mutex_destroy(pthread_mutex_t *const mutex) {
+ return DosCloseMutexSem(*mutex) != 0;
+}
+
+// Condition
+static INLINE int pthread_cond_destroy(pthread_cond_t *const condition) {
+ int ok = 1;
+ ok &= DosCloseEventSem(condition->event_sem_) == 0;
+ ok &= DosCloseEventSem(condition->ack_sem_) == 0;
+ return !ok;
+}
+
+static INLINE int pthread_cond_init(pthread_cond_t *const condition,
+ void *cond_attr) {
+ int ok = 1;
+ (void)cond_attr;
+
+ ok &=
+ DosCreateEventSem(NULL, &condition->event_sem_, DCE_POSTONE, FALSE) == 0;
+ ok &= DosCreateEventSem(NULL, &condition->ack_sem_, DCE_POSTONE, FALSE) == 0;
+ if (!ok) {
+ pthread_cond_destroy(condition);
+ return 1;
+ }
+ condition->wait_count_ = 0;
+ return 0;
+}
+
+static INLINE int pthread_cond_signal(pthread_cond_t *const condition) {
+ int ok = 1;
+
+ if (!__atomic_cmpxchg32(&condition->wait_count_, 0, 0)) {
+ ok &= DosPostEventSem(condition->event_sem_) == 0;
+ ok &= DosWaitEventSem(condition->ack_sem_, SEM_INDEFINITE_WAIT) == 0;
+ }
+
+ return !ok;
+}
+
+static INLINE int pthread_cond_broadcast(pthread_cond_t *const condition) {
+ int ok = 1;
+
+ while (!__atomic_cmpxchg32(&condition->wait_count_, 0, 0))
+ ok &= pthread_cond_signal(condition) == 0;
+
+ return !ok;
+}
+
+static INLINE int pthread_cond_wait(pthread_cond_t *const condition,
+ pthread_mutex_t *const mutex) {
+ int ok = 1;
+
+ __atomic_increment(&condition->wait_count_);
+
+ ok &= pthread_mutex_unlock(mutex) == 0;
+
+ ok &= DosWaitEventSem(condition->event_sem_, SEM_INDEFINITE_WAIT) == 0;
+
+ __atomic_decrement(&condition->wait_count_);
+
+ ok &= DosPostEventSem(condition->ack_sem_) == 0;
+
+ pthread_mutex_lock(mutex);
+
+ return !ok;
+}
+#else // _WIN32
+#include <pthread.h> // NOLINT
+#define THREADFN void *
+#define THREAD_RETURN(val) val
+#endif
+
+#endif // CONFIG_MULTITHREAD
+
+// State of the worker thread object
+typedef enum {
+ NOT_OK = 0, // object is unusable
+ OK, // ready to work
+ WORK // busy finishing the current task
+} VPxWorkerStatus;
+
+// Function to be called by the worker thread. Takes two opaque pointers as
+// arguments (data1 and data2), and should return false in case of error.
+typedef int (*VPxWorkerHook)(void *, void *);
+
+// Platform-dependent implementation details for the worker.
+typedef struct VPxWorkerImpl VPxWorkerImpl;
+
+// Synchronization object used to launch job in the worker thread
+typedef struct {
+ VPxWorkerImpl *impl_;
+ VPxWorkerStatus status_;
+ VPxWorkerHook hook; // hook to call
+ void *data1; // first argument passed to 'hook'
+ void *data2; // second argument passed to 'hook'
+ int had_error; // return value of the last call to 'hook'
+} VPxWorker;
+
+// The interface for all thread-worker related functions. All these functions
+// must be implemented.
+typedef struct {
+ // Must be called first, before any other method.
+ void (*init)(VPxWorker *const worker);
+ // Must be called to initialize the object and spawn the thread. Re-entrant.
+ // Will potentially launch the thread. Returns false in case of error.
+ int (*reset)(VPxWorker *const worker);
+ // Makes sure the previous work is finished. Returns true if worker->had_error
+ // was not set and no error condition was triggered by the working thread.
+ int (*sync)(VPxWorker *const worker);
+ // Triggers the thread to call hook() with data1 and data2 arguments. These
+ // hook/data1/data2 values can be changed at any time before calling this
+ // function, but not be changed afterward until the next call to Sync().
+ void (*launch)(VPxWorker *const worker);
+ // This function is similar to launch() except that it calls the
+ // hook directly instead of using a thread. Convenient to bypass the thread
+ // mechanism while still using the VPxWorker structs. sync() must
+ // still be called afterward (for error reporting).
+ void (*execute)(VPxWorker *const worker);
+ // Kill the thread and terminate the object. To use the object again, one
+ // must call reset() again.
+ void (*end)(VPxWorker *const worker);
+} VPxWorkerInterface;
+
+// Install a new set of threading functions, overriding the defaults. This
+// should be done before any workers are started, i.e., before any encoding or
+// decoding takes place. The contents of the interface struct are copied, it
+// is safe to free the corresponding memory after this call. This function is
+// not thread-safe. Return false in case of invalid pointer or methods.
+int vpx_set_worker_interface(const VPxWorkerInterface *const winterface);
+
+// Retrieve the currently set thread worker interface.
+const VPxWorkerInterface *vpx_get_worker_interface(void);
+
+//------------------------------------------------------------------------------
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // VPX_THREAD_H_
diff --git a/aom_util/vpx_util.mk b/aom_util/vpx_util.mk
new file mode 100644
index 0000000..480e61f
--- /dev/null
+++ b/aom_util/vpx_util.mk
@@ -0,0 +1,16 @@
+##
+## Copyright (c) 2015 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.
+##
+
+UTIL_SRCS-yes += vpx_util.mk
+UTIL_SRCS-yes += vpx_thread.c
+UTIL_SRCS-yes += vpx_thread.h
+UTIL_SRCS-yes += debug_util.c
+UTIL_SRCS-yes += debug_util.h
+UTIL_SRCS-yes += endian_inl.h
