1 // Copyright 2013 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "media/base/media.h" 6 7 #include "base/files/file_path.h" 8 #include "base/lazy_instance.h" 9 #include "base/path_service.h" 10 #include "base/synchronization/lock.h" 11 #include "build/build_config.h" 12 #include "media/base/yuv_convert.h" 13 14 namespace media { 15 16 namespace internal { 17 // Platform specific initialization method. 18 extern bool InitializeMediaLibraryInternal(const base::FilePath& module_dir); 19 } // namespace internal 20 21 // Media must only be initialized once, so use a LazyInstance to ensure this. 22 class MediaInitializer { 23 public: Initialize(const base::FilePath & module_dir)24 bool Initialize(const base::FilePath& module_dir) { 25 base::AutoLock auto_lock(lock_); 26 if (!tried_initialize_) { 27 tried_initialize_ = true; 28 initialized_ = internal::InitializeMediaLibraryInternal(module_dir); 29 } 30 return initialized_; 31 } 32 IsInitialized()33 bool IsInitialized() { 34 base::AutoLock auto_lock(lock_); 35 return initialized_; 36 } 37 38 private: 39 friend struct base::DefaultLazyInstanceTraits<MediaInitializer>; 40 MediaInitializer()41 MediaInitializer() 42 : initialized_(false), 43 tried_initialize_(false) { 44 // Perform initialization of libraries which require runtime CPU detection. 45 InitializeCPUSpecificYUVConversions(); 46 } 47 ~MediaInitializer()48 ~MediaInitializer() { 49 NOTREACHED() << "MediaInitializer should be leaky!"; 50 } 51 52 base::Lock lock_; 53 bool initialized_; 54 bool tried_initialize_; 55 56 DISALLOW_COPY_AND_ASSIGN(MediaInitializer); 57 }; 58 59 static base::LazyInstance<MediaInitializer>::Leaky g_media_library = 60 LAZY_INSTANCE_INITIALIZER; 61 InitializeMediaLibrary(const base::FilePath & module_dir)62bool InitializeMediaLibrary(const base::FilePath& module_dir) { 63 return g_media_library.Get().Initialize(module_dir); 64 } 65 InitializeMediaLibraryForTesting()66void InitializeMediaLibraryForTesting() { 67 base::FilePath module_dir; 68 CHECK(PathService::Get(base::DIR_EXE, &module_dir)); 69 CHECK(g_media_library.Get().Initialize(module_dir)); 70 } 71 IsMediaLibraryInitialized()72bool IsMediaLibraryInitialized() { 73 return g_media_library.Get().IsInitialized(); 74 } 75 InitializeCPUSpecificMediaFeatures()76void InitializeCPUSpecificMediaFeatures() { 77 // Force initialization of the media initializer, but don't call Initialize(). 78 g_media_library.Get(); 79 } 80 81 } // namespace media 82