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 "init_webrtc.h"
6
7 #include "base/command_line.h"
8 #include "base/debug/trace_event.h"
9 #include "base/file_util.h"
10 #include "base/files/file_path.h"
11 #include "base/metrics/field_trial.h"
12 #include "base/native_library.h"
13 #include "base/path_service.h"
14 #include "talk/base/basictypes.h"
15 #include "third_party/libjingle/overrides/talk/base/logging.h"
16
GetCategoryGroupEnabled(const char * category_group)17 const unsigned char* GetCategoryGroupEnabled(const char* category_group) {
18 return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group);
19 }
20
AddTraceEvent(char phase,const unsigned char * category_group_enabled,const char * name,unsigned long long id,int num_args,const char ** arg_names,const unsigned char * arg_types,const unsigned long long * arg_values,unsigned char flags)21 void AddTraceEvent(char phase,
22 const unsigned char* category_group_enabled,
23 const char* name,
24 unsigned long long id,
25 int num_args,
26 const char** arg_names,
27 const unsigned char* arg_types,
28 const unsigned long long* arg_values,
29 unsigned char flags) {
30 TRACE_EVENT_API_ADD_TRACE_EVENT(phase, category_group_enabled, name, id,
31 num_args, arg_names, arg_types, arg_values,
32 NULL, flags);
33 }
34
35 #if defined(LIBPEERCONNECTION_LIB)
36
37 // libpeerconnection is being compiled as a static lib. In this case
38 // we don't need to do any initializing but to keep things simple we
39 // provide an empty intialization routine so that this #ifdef doesn't
40 // have to be in other places.
InitializeWebRtcModule()41 bool InitializeWebRtcModule() {
42 webrtc::SetupEventTracer(&GetCategoryGroupEnabled, &AddTraceEvent);
43 return true;
44 }
45
46 // Define webrtc:field_trial::FindFullName to provide webrtc with a field trial
47 // implementation. When compiled as a static library this can be done directly
48 // and without pointers to functions.
49 namespace webrtc {
50 namespace field_trial {
FindFullName(const std::string & trial_name)51 std::string FindFullName(const std::string& trial_name) {
52 return base::FieldTrialList::FindFullName(trial_name);
53 }
54 } // namespace field_trial
55 } // namespace webrtc
56
57 #else // !LIBPEERCONNECTION_LIB
58
59 // When being compiled as a shared library, we need to bridge the gap between
60 // the current module and the libpeerconnection module, so things get a tad
61 // more complicated.
62
63 // Global function pointers to the factory functions in the shared library.
64 CreateWebRtcMediaEngineFunction g_create_webrtc_media_engine = NULL;
65 DestroyWebRtcMediaEngineFunction g_destroy_webrtc_media_engine = NULL;
66
67 // Returns the full or relative path to the libpeerconnection module depending
68 // on what platform we're on.
GetLibPeerConnectionPath()69 static base::FilePath GetLibPeerConnectionPath() {
70 base::FilePath path;
71 CHECK(PathService::Get(base::DIR_MODULE, &path));
72 #if defined(OS_WIN)
73 path = path.Append(FILE_PATH_LITERAL("libpeerconnection.dll"));
74 #elif defined(OS_MACOSX)
75 // Simulate '@loader_path/Libraries'.
76 path = path.Append(FILE_PATH_LITERAL("Libraries"))
77 .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
78 #elif defined(OS_ANDROID)
79 path = path.Append(FILE_PATH_LITERAL("libpeerconnection.so"));
80 #else
81 path = path.Append(FILE_PATH_LITERAL("lib"))
82 .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
83 #endif
84 return path;
85 }
86
InitializeWebRtcModule()87 bool InitializeWebRtcModule() {
88 TRACE_EVENT0("webrtc", "InitializeWebRtcModule");
89
90 if (g_create_webrtc_media_engine)
91 return true; // InitializeWebRtcModule has already been called.
92
93 base::FilePath path(GetLibPeerConnectionPath());
94 DVLOG(1) << "Loading WebRTC module: " << path.value();
95
96 base::NativeLibraryLoadError error;
97 static base::NativeLibrary lib = base::LoadNativeLibrary(path, &error);
98 #if defined(OS_WIN)
99 // We've been seeing problems on Windows with loading the DLL and we're
100 // not sure exactly why. It could be that AV programs are quarantining the
101 // file or disallowing loading the DLL. To get a better picture of the errors
102 // we're checking these specific error codes.
103 if (error.code == ERROR_MOD_NOT_FOUND) {
104 // It's possible that we get this error due to failure to load other
105 // dependencies, so check first that libpeerconnection actually exists.
106 CHECK(base::PathExists(path)); // libpeerconnection itself is missing.
107 CHECK(lib); // If we hit this, a dependency is missing.
108 } else if (error.code == ERROR_ACCESS_DENIED) {
109 CHECK(lib); // AV blocking access?
110 }
111 #endif
112
113 // Catch-all error handler for all other sorts of errors.
114 CHECK(lib) << error.ToString();
115
116 InitializeModuleFunction initialize_module =
117 reinterpret_cast<InitializeModuleFunction>(
118 base::GetFunctionPointerFromNativeLibrary(
119 lib, "InitializeModule"));
120
121 // Initialize the proxy by supplying it with a pointer to our
122 // allocator/deallocator routines.
123 // On mac we use malloc zones, which are global, so we provide NULLs for
124 // the alloc/dealloc functions.
125 // PS: This function is actually implemented in allocator_proxy.cc with the
126 // new/delete overrides.
127 InitDiagnosticLoggingDelegateFunctionFunction init_diagnostic_logging = NULL;
128 bool init_ok = initialize_module(*CommandLine::ForCurrentProcess(),
129 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
130 &Allocate, &Dellocate,
131 #endif
132 &base::FieldTrialList::FindFullName,
133 logging::GetLogMessageHandler(),
134 &GetCategoryGroupEnabled, &AddTraceEvent,
135 &g_create_webrtc_media_engine, &g_destroy_webrtc_media_engine,
136 &init_diagnostic_logging);
137
138 if (init_ok)
139 talk_base::SetExtraLoggingInit(init_diagnostic_logging);
140 return init_ok;
141 }
142
CreateWebRtcMediaEngine(webrtc::AudioDeviceModule * adm,webrtc::AudioDeviceModule * adm_sc,cricket::WebRtcVideoEncoderFactory * encoder_factory,cricket::WebRtcVideoDecoderFactory * decoder_factory)143 cricket::MediaEngineInterface* CreateWebRtcMediaEngine(
144 webrtc::AudioDeviceModule* adm,
145 webrtc::AudioDeviceModule* adm_sc,
146 cricket::WebRtcVideoEncoderFactory* encoder_factory,
147 cricket::WebRtcVideoDecoderFactory* decoder_factory) {
148 // For convenience of tests etc, we call InitializeWebRtcModule here.
149 // For Chrome however, InitializeWebRtcModule must be called
150 // explicitly before the sandbox is initialized. In that case, this call is
151 // effectively a noop.
152 InitializeWebRtcModule();
153 return g_create_webrtc_media_engine(adm, adm_sc, encoder_factory,
154 decoder_factory);
155 }
156
DestroyWebRtcMediaEngine(cricket::MediaEngineInterface * media_engine)157 void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {
158 g_destroy_webrtc_media_engine(media_engine);
159 }
160
161 #endif // LIBPEERCONNECTION_LIB
162