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/sinc_resampler.h"
13#include "media/base/vector_math.h"
14#include "media/base/yuv_convert.h"
15
16namespace media {
17
18namespace internal {
19// Platform specific initialization method.
20extern bool InitializeMediaLibraryInternal(const base::FilePath& module_dir);
21}  // namespace internal
22
23// Media must only be initialized once, so use a LazyInstance to ensure this.
24class MediaInitializer {
25 public:
26  bool Initialize(const base::FilePath& module_dir) {
27    base::AutoLock auto_lock(lock_);
28    if (!tried_initialize_) {
29      tried_initialize_ = true;
30      initialized_ = internal::InitializeMediaLibraryInternal(module_dir);
31    }
32    return initialized_;
33  }
34
35  bool IsInitialized() {
36    base::AutoLock auto_lock(lock_);
37    return initialized_;
38  }
39
40 private:
41  friend struct base::DefaultLazyInstanceTraits<MediaInitializer>;
42
43  MediaInitializer()
44      : initialized_(false),
45        tried_initialize_(false) {
46    // Perform initialization of libraries which require runtime CPU detection.
47    // TODO(dalecurtis): Add initialization of YUV, SincResampler.
48    vector_math::Initialize();
49#if !defined(OS_IOS)
50    SincResampler::InitializeCPUSpecificFeatures();
51    InitializeCPUSpecificYUVConversions();
52#endif
53  }
54
55  ~MediaInitializer() {
56    NOTREACHED() << "MediaInitializer should be leaky!";
57  }
58
59  base::Lock lock_;
60  bool initialized_;
61  bool tried_initialize_;
62
63  DISALLOW_COPY_AND_ASSIGN(MediaInitializer);
64};
65
66static base::LazyInstance<MediaInitializer>::Leaky g_media_library =
67    LAZY_INSTANCE_INITIALIZER;
68
69bool InitializeMediaLibrary(const base::FilePath& module_dir) {
70  return g_media_library.Get().Initialize(module_dir);
71}
72
73void InitializeMediaLibraryForTesting() {
74  base::FilePath module_dir;
75  CHECK(PathService::Get(base::DIR_EXE, &module_dir));
76  CHECK(g_media_library.Get().Initialize(module_dir));
77}
78
79bool IsMediaLibraryInitialized() {
80  return g_media_library.Get().IsInitialized();
81}
82
83void InitializeCPUSpecificMediaFeatures() {
84  // Force initialization of the media initializer, but don't call Initialize().
85  g_media_library.Get();
86}
87
88}  // namespace media
89