third_party/libjingle/overrides/init_webrtc.cc

   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
  17 const unsigned char* GetCategoryGroupEnabled(const char* category_group) {
  18   return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group);
  19 }
  20
  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 {
  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.
  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.
  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
  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
 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
 159 void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {
 160   g_destroy_webrtc_media_engine(media_engine);
 161 }
 162
 163 #endif  // LIBPEERCONNECTION_LIB