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/native_library.h"
  12 #include "base/path_service.h"
  13 #include "talk/base/basictypes.h"
  14 #include "third_party/libjingle/overrides/talk/base/logging.h"
  15
  16 const unsigned char* GetCategoryGroupEnabled(const char* category_group) {
  17   return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group);
  18 }
  19
  20 void AddTraceEvent(char phase,
  21                    const unsigned char* category_group_enabled,
  22                    const char* name,
  23                    unsigned long long id,
  24                    int num_args,
  25                    const char** arg_names,
  26                    const unsigned char* arg_types,
  27                    const unsigned long long* arg_values,
  28                    unsigned char flags) {
  29   TRACE_EVENT_API_ADD_TRACE_EVENT(phase, category_group_enabled, name, id,
  30                                   num_args, arg_names, arg_types, arg_values,
  31                                   NULL, flags);
  32 }
  33
  34 #if defined(LIBPEERCONNECTION_LIB)
  35
  36 // libpeerconnection is being compiled as a static lib.  In this case
  37 // we don't need to do any initializing but to keep things simple we
  38 // provide an empty intialization routine so that this #ifdef doesn't
  39 // have to be in other places.
  40 bool InitializeWebRtcModule() {
  41   webrtc::SetupEventTracer(&GetCategoryGroupEnabled, &AddTraceEvent);
  42   return true;
  43 }
  44
  45 #else  // !LIBPEERCONNECTION_LIB
  46
  47 // When being compiled as a shared library, we need to bridge the gap between
  48 // the current module and the libpeerconnection module, so things get a tad
  49 // more complicated.
  50
  51 // Global function pointers to the factory functions in the shared library.
  52 CreateWebRtcMediaEngineFunction g_create_webrtc_media_engine = NULL;
  53 DestroyWebRtcMediaEngineFunction g_destroy_webrtc_media_engine = NULL;
  54
  55 // Returns the full or relative path to the libpeerconnection module depending
  56 // on what platform we're on.
  57 static base::FilePath GetLibPeerConnectionPath() {
  58   base::FilePath path;
  59   CHECK(PathService::Get(base::DIR_MODULE, &path));
  60 #if defined(OS_WIN)
  61   path = path.Append(FILE_PATH_LITERAL("libpeerconnection.dll"));
  62 #elif defined(OS_MACOSX)
  63   // Simulate '@loader_path/Libraries'.
  64   path = path.Append(FILE_PATH_LITERAL("Libraries"))
  65              .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
  66 #elif defined(OS_ANDROID)
  67   path = path.Append(FILE_PATH_LITERAL("libpeerconnection.so"));
  68 #else
  69   path = path.Append(FILE_PATH_LITERAL("lib"))
  70              .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
  71 #endif
  72   return path;
  73 }
  74
  75 bool InitializeWebRtcModule() {
  76   TRACE_EVENT0("webrtc", "InitializeWebRtcModule");
  77
  78   if (g_create_webrtc_media_engine)
  79     return true;  // InitializeWebRtcModule has already been called.
  80
  81   base::FilePath path(GetLibPeerConnectionPath());
  82   DVLOG(1) << "Loading WebRTC module: " << path.value();
  83
  84   base::NativeLibraryLoadError error;
  85   static base::NativeLibrary lib = base::LoadNativeLibrary(path, &error);
  86 #if defined(OS_WIN)
  87   // We've been seeing problems on Windows with loading the DLL and we're
  88   // not sure exactly why.  It could be that AV programs are quarantining the
  89   // file or disallowing loading the DLL. To get a better picture of the errors
  90   // we're checking these specific error codes.
  91   if (error.code == ERROR_MOD_NOT_FOUND) {
  92     // It's possible that we get this error due to failure to load other
  93     // dependencies, so check first that libpeerconnection actually exists.
  94     CHECK(base::PathExists(path));  // libpeerconnection itself is missing.
  95     CHECK(lib);  // If we hit this, a dependency is missing.
  96   } else if (error.code == ERROR_ACCESS_DENIED) {
  97     CHECK(lib);  // AV blocking access?
  98   }
  99 #endif
 100
 101   // Catch-all error handler for all other sorts of errors.
 102   CHECK(lib) << error.ToString();
 103
 104   InitializeModuleFunction initialize_module =
 105       reinterpret_cast<InitializeModuleFunction>(
 106           base::GetFunctionPointerFromNativeLibrary(
 107               lib, "InitializeModule"));
 108
 109   // Initialize the proxy by supplying it with a pointer to our
 110   // allocator/deallocator routines.
 111   // On mac we use malloc zones, which are global, so we provide NULLs for
 112   // the alloc/dealloc functions.
 113   // PS: This function is actually implemented in allocator_proxy.cc with the
 114   // new/delete overrides.
 115   InitDiagnosticLoggingDelegateFunctionFunction init_diagnostic_logging = NULL;
 116   bool init_ok = initialize_module(*CommandLine::ForCurrentProcess(),
 117 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
 118       &Allocate, &Dellocate,
 119 #endif
 120       logging::GetLogMessageHandler(),
 121       &GetCategoryGroupEnabled, &AddTraceEvent,
 122       &g_create_webrtc_media_engine, &g_destroy_webrtc_media_engine,
 123       &init_diagnostic_logging);
 124
 125   if (init_ok)
 126     talk_base::SetExtraLoggingInit(init_diagnostic_logging);
 127   return init_ok;
 128 }
 129
 130 cricket::MediaEngineInterface* CreateWebRtcMediaEngine(
 131     webrtc::AudioDeviceModule* adm,
 132     webrtc::AudioDeviceModule* adm_sc,
 133     cricket::WebRtcVideoEncoderFactory* encoder_factory,
 134     cricket::WebRtcVideoDecoderFactory* decoder_factory) {
 135   // For convenience of tests etc, we call InitializeWebRtcModule here.
 136   // For Chrome however, InitializeWebRtcModule must be called
 137   // explicitly before the sandbox is initialized.  In that case, this call is
 138   // effectively a noop.
 139   InitializeWebRtcModule();
 140   return g_create_webrtc_media_engine(adm, adm_sc, encoder_factory,
 141       decoder_factory);
 142 }
 143
 144 void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {
 145   g_destroy_webrtc_media_engine(media_engine);
 146 }
 147
 148 #endif  // LIBPEERCONNECTION_LIB