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