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
17const unsigned char* GetCategoryGroupEnabled(const char* category_group) {
18  return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group);
19}
20
21void 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.
37namespace webrtc {
38namespace field_trial {
39std::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.
51bool 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.
63CreateWebRtcMediaEngineFunction g_create_webrtc_media_engine = NULL;
64DestroyWebRtcMediaEngineFunction 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.
68static 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
86bool 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
145cricket::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
159void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {
160  g_destroy_webrtc_media_engine(media_engine);
161}
162
163#endif  // LIBPEERCONNECTION_LIB
164