Home | History | Annotate | Download | only in overrides 
      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
    124