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/native_library.h"
11 #include "base/path_service.h"
12 #include "talk/base/basictypes.h"
13 #include "third_party/libjingle/overrides/talk/base/logging.h"
14
GetCategoryGroupEnabled(const char * category_group)15 const unsigned char* GetCategoryGroupEnabled(const char* category_group) {
16 return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group);
17 }
18
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)19 void AddTraceEvent(char phase,
20 const unsigned char* category_group_enabled,
21 const char* name,
22 unsigned long long id,
23 int num_args,
24 const char** arg_names,
25 const unsigned char* arg_types,
26 const unsigned long long* arg_values,
27 unsigned char flags) {
28 TRACE_EVENT_API_ADD_TRACE_EVENT(phase, category_group_enabled, name, id,
29 num_args, arg_names, arg_types, arg_values,
30 NULL, flags);
31 }
32
33 #if defined(LIBPEERCONNECTION_LIB)
34
35 // libpeerconnection is being compiled as a static lib. In this case
36 // we don't need to do any initializing but to keep things simple we
37 // provide an empty intialization routine so that this #ifdef doesn't
38 // have to be in other places.
InitializeWebRtcModule()39 bool InitializeWebRtcModule() {
40 webrtc::SetupEventTracer(&GetCategoryGroupEnabled, &AddTraceEvent);
41 return true;
42 }
43
44 #else // !LIBPEERCONNECTION_LIB
45
46 // When being compiled as a shared library, we need to bridge the gap between
47 // the current module and the libpeerconnection module, so things get a tad
48 // more complicated.
49
50 // Global function pointers to the factory functions in the shared library.
51 CreateWebRtcMediaEngineFunction g_create_webrtc_media_engine = NULL;
52 DestroyWebRtcMediaEngineFunction g_destroy_webrtc_media_engine = NULL;
53
54 // Returns the full or relative path to the libpeerconnection module depending
55 // on what platform we're on.
GetLibPeerConnectionPath()56 static base::FilePath GetLibPeerConnectionPath() {
57 base::FilePath path;
58 CHECK(PathService::Get(base::DIR_MODULE, &path));
59 #if defined(OS_WIN)
60 path = path.Append(FILE_PATH_LITERAL("libpeerconnection.dll"));
61 #elif defined(OS_MACOSX)
62 // Simulate '@loader_path/Libraries'.
63 path = path.Append(FILE_PATH_LITERAL("Libraries"))
64 .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
65 #elif defined(OS_ANDROID)
66 path = path.Append(FILE_PATH_LITERAL("libpeerconnection.so"));
67 #else
68 path = path.Append(FILE_PATH_LITERAL("lib"))
69 .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
70 #endif
71 return path;
72 }
73
InitializeWebRtcModule()74 bool InitializeWebRtcModule() {
75 TRACE_EVENT0("webrtc", "InitializeWebRtcModule");
76
77 if (g_create_webrtc_media_engine)
78 return true; // InitializeWebRtcModule has already been called.
79
80 base::FilePath path(GetLibPeerConnectionPath());
81 DVLOG(1) << "Loading WebRTC module: " << path.value();
82
83 std::string error;
84 static base::NativeLibrary lib =
85 base::LoadNativeLibrary(path, &error);
86 CHECK(lib) << error;
87
88 InitializeModuleFunction initialize_module =
89 reinterpret_cast<InitializeModuleFunction>(
90 base::GetFunctionPointerFromNativeLibrary(
91 lib, "InitializeModule"));
92
93 // Initialize the proxy by supplying it with a pointer to our
94 // allocator/deallocator routines.
95 // On mac we use malloc zones, which are global, so we provide NULLs for
96 // the alloc/dealloc functions.
97 // PS: This function is actually implemented in allocator_proxy.cc with the
98 // new/delete overrides.
99 InitDiagnosticLoggingDelegateFunctionFunction init_diagnostic_logging = NULL;
100 bool init_ok = initialize_module(*CommandLine::ForCurrentProcess(),
101 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
102 &Allocate, &Dellocate,
103 #endif
104 logging::GetLogMessageHandler(),
105 &GetCategoryGroupEnabled, &AddTraceEvent,
106 &g_create_webrtc_media_engine, &g_destroy_webrtc_media_engine,
107 &init_diagnostic_logging);
108
109 if (init_ok)
110 talk_base::SetExtraLoggingInit(init_diagnostic_logging);
111 return init_ok;
112 }
113
CreateWebRtcMediaEngine(webrtc::AudioDeviceModule * adm,webrtc::AudioDeviceModule * adm_sc,cricket::WebRtcVideoEncoderFactory * encoder_factory,cricket::WebRtcVideoDecoderFactory * decoder_factory)114 cricket::MediaEngineInterface* CreateWebRtcMediaEngine(
115 webrtc::AudioDeviceModule* adm,
116 webrtc::AudioDeviceModule* adm_sc,
117 cricket::WebRtcVideoEncoderFactory* encoder_factory,
118 cricket::WebRtcVideoDecoderFactory* decoder_factory) {
119 // For convenience of tests etc, we call InitializeWebRtcModule here.
120 // For Chrome however, InitializeWebRtcModule must be called
121 // explicitly before the sandbox is initialized. In that case, this call is
122 // effectively a noop.
123 InitializeWebRtcModule();
124 return g_create_webrtc_media_engine(adm, adm_sc, encoder_factory,
125 decoder_factory);
126 }
127
DestroyWebRtcMediaEngine(cricket::MediaEngineInterface * media_engine)128 void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {
129 g_destroy_webrtc_media_engine(media_engine);
130 }
131
132 #endif // LIBPEERCONNECTION_LIB
133