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
14namespace media {
15
16namespace internal {
17// Platform specific initialization method.
18extern 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.
22class MediaInitializer {
23 public:
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
33  bool IsInitialized() {
34    base::AutoLock auto_lock(lock_);
35    return initialized_;
36  }
37
38 private:
39  friend struct base::DefaultLazyInstanceTraits<MediaInitializer>;
40
41  MediaInitializer()
42      : initialized_(false),
43        tried_initialize_(false) {
44    // Perform initialization of libraries which require runtime CPU detection.
45    InitializeCPUSpecificYUVConversions();
46  }
47
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
59static base::LazyInstance<MediaInitializer>::Leaky g_media_library =
60    LAZY_INSTANCE_INITIALIZER;
61
62bool InitializeMediaLibrary(const base::FilePath& module_dir) {
63  return g_media_library.Get().Initialize(module_dir);
64}
65
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
72bool IsMediaLibraryInitialized() {
73  return g_media_library.Get().IsInitialized();
74}
75
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