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/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
  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 #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.
  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 {
  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.
  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
  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
 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
 157 void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {
 158   g_destroy_webrtc_media_engine(media_engine);
 159 }
 160
 161 #endif  // LIBPEERCONNECTION_LIB