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/files/file_path.h"
10 #include "base/files/file_util.h"
11 #include "base/metrics/field_trial.h"
12 #include "base/native_library.h"
13 #include "base/path_service.h"
14 #include "webrtc/base/basictypes.h"
15 #include "webrtc/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 // Define webrtc:field_trial::FindFullName to provide webrtc with a field trial
36 // implementation.
37 namespace webrtc {
38 namespace field_trial {
FindFullName(const std::string & trial_name)39 std::string FindFullName(const std::string& trial_name) {
40 return base::FieldTrialList::FindFullName(trial_name);
41 }
42 } // namespace field_trial
43 } // namespace webrtc
44
45 #if defined(LIBPEERCONNECTION_LIB)
46
47 // libpeerconnection is being compiled as a static lib. In this case
48 // we don't need to do any initializing but to keep things simple we
49 // provide an empty intialization routine so that this #ifdef doesn't
50 // have to be in other places.
InitializeWebRtcModule()51 bool InitializeWebRtcModule() {
52 webrtc::SetupEventTracer(&GetCategoryGroupEnabled, &AddTraceEvent);
53 return true;
54 }
55
56 #else // !LIBPEERCONNECTION_LIB
57
58 // When being compiled as a shared library, we need to bridge the gap between
59 // the current module and the libpeerconnection module, so things get a tad
60 // more complicated.
61
62 // Global function pointers to the factory functions in the shared library.
63 CreateWebRtcMediaEngineFunction g_create_webrtc_media_engine = NULL;
64 DestroyWebRtcMediaEngineFunction g_destroy_webrtc_media_engine = NULL;
65
66 // Returns the full or relative path to the libpeerconnection module depending
67 // on what platform we're on.
GetLibPeerConnectionPath()68 static base::FilePath GetLibPeerConnectionPath() {
69 base::FilePath path;
70 CHECK(PathService::Get(base::DIR_MODULE, &path));
71 #if defined(OS_WIN)
72 path = path.Append(FILE_PATH_LITERAL("libpeerconnection.dll"));
73 #elif defined(OS_MACOSX)
74 // Simulate '@loader_path/Libraries'.
75 path = path.Append(FILE_PATH_LITERAL("Libraries"))
76 .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
77 #elif defined(OS_ANDROID)
78 path = path.Append(FILE_PATH_LITERAL("libpeerconnection.so"));
79 #else
80 path = path.Append(FILE_PATH_LITERAL("lib"))
81 .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
82 #endif
83 return path;
84 }
85
InitializeWebRtcModule()86 bool InitializeWebRtcModule() {
87 TRACE_EVENT0("webrtc", "InitializeWebRtcModule");
88
89 if (g_create_webrtc_media_engine)
90 return true; // InitializeWebRtcModule has already been called.
91
92 base::FilePath path(GetLibPeerConnectionPath());
93 DVLOG(1) << "Loading WebRTC module: " << path.value();
94
95 base::NativeLibraryLoadError error;
96 static base::NativeLibrary lib = base::LoadNativeLibrary(path, &error);
97 #if defined(OS_WIN)
98 // We've been seeing problems on Windows with loading the DLL and we're
99 // not sure exactly why. It could be that AV programs are quarantining the
100 // file or disallowing loading the DLL. To get a better picture of the errors
101 // we're checking these specific error codes.
102 if (error.code == ERROR_MOD_NOT_FOUND) {
103 // It's possible that we get this error due to failure to load other
104 // dependencies, so check first that libpeerconnection actually exists.
105 CHECK(base::PathExists(path)); // libpeerconnection itself is missing.
106 CHECK(lib); // If we hit this, a dependency is missing.
107 } else if (error.code == ERROR_ACCESS_DENIED) {
108 CHECK(lib); // AV blocking access?
109 }
110 #endif
111
112 // Catch-all error handler for all other sorts of errors.
113 CHECK(lib) << error.ToString();
114
115 InitializeModuleFunction initialize_module =
116 reinterpret_cast<InitializeModuleFunction>(
117 base::GetFunctionPointerFromNativeLibrary(
118 lib, "InitializeModule"));
119
120 // Initialize the proxy by supplying it with a pointer to our
121 // allocator/deallocator routines.
122 // On mac we use malloc zones, which are global, so we provide NULLs for
123 // the alloc/dealloc functions.
124 // PS: This function is actually implemented in allocator_proxy.cc with the
125 // new/delete overrides.
126 InitDiagnosticLoggingDelegateFunctionFunction init_diagnostic_logging = NULL;
127 bool init_ok = initialize_module(*CommandLine::ForCurrentProcess(),
128 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
129 &Allocate,
130 &Dellocate,
131 #endif
132 &webrtc::field_trial::FindFullName,
133 logging::GetLogMessageHandler(),
134 &GetCategoryGroupEnabled,
135 &AddTraceEvent,
136 &g_create_webrtc_media_engine,
137 &g_destroy_webrtc_media_engine,
138 &init_diagnostic_logging);
139
140 if (init_ok)
141 rtc::SetExtraLoggingInit(init_diagnostic_logging);
142 return init_ok;
143 }
144
CreateWebRtcMediaEngine(webrtc::AudioDeviceModule * adm,webrtc::AudioDeviceModule * adm_sc,cricket::WebRtcVideoEncoderFactory * encoder_factory,cricket::WebRtcVideoDecoderFactory * decoder_factory)145 cricket::MediaEngineInterface* CreateWebRtcMediaEngine(
146 webrtc::AudioDeviceModule* adm,
147 webrtc::AudioDeviceModule* adm_sc,
148 cricket::WebRtcVideoEncoderFactory* encoder_factory,
149 cricket::WebRtcVideoDecoderFactory* decoder_factory) {
150 // For convenience of tests etc, we call InitializeWebRtcModule here.
151 // For Chrome however, InitializeWebRtcModule must be called
152 // explicitly before the sandbox is initialized. In that case, this call is
153 // effectively a noop.
154 InitializeWebRtcModule();
155 return g_create_webrtc_media_engine(adm, adm_sc, encoder_factory,
156 decoder_factory);
157 }
158
DestroyWebRtcMediaEngine(cricket::MediaEngineInterface * media_engine)159 void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {
160 g_destroy_webrtc_media_engine(media_engine);
161 }
162
163 #endif // LIBPEERCONNECTION_LIB
164