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