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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/files/file_util.h"
     11 #include "base/metrics/field_trial.h"
     12 #include "base/native_library.h"
     13 #include "base/path_service.h"
     14 #include "webrtc/base/basictypes.h"
     15 #include "webrtc/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 // Define webrtc:field_trial::FindFullName to provide webrtc with a field trial
     36 // implementation.
     37 namespace webrtc {
     38 namespace field_trial {
     39 std::string FindFullName(const std::string& trial_name) {
     40   return base::FieldTrialList::FindFullName(trial_name);
     41 }
     42 }  // namespace field_trial
     43 }  // namespace webrtc
     44 
     45 #if defined(LIBPEERCONNECTION_LIB)
     46 
     47 // libpeerconnection is being compiled as a static lib.  In this case
     48 // we don't need to do any initializing but to keep things simple we
     49 // provide an empty intialization routine so that this #ifdef doesn't
     50 // have to be in other places.
     51 bool InitializeWebRtcModule() {
     52   webrtc::SetupEventTracer(&GetCategoryGroupEnabled, &AddTraceEvent);
     53   return true;
     54 }
     55 
     56 #else  // !LIBPEERCONNECTION_LIB
     57 
     58 // When being compiled as a shared library, we need to bridge the gap between
     59 // the current module and the libpeerconnection module, so things get a tad
     60 // more complicated.
     61 
     62 // Global function pointers to the factory functions in the shared library.
     63 CreateWebRtcMediaEngineFunction g_create_webrtc_media_engine = NULL;
     64 DestroyWebRtcMediaEngineFunction g_destroy_webrtc_media_engine = NULL;
     65 
     66 // Returns the full or relative path to the libpeerconnection module depending
     67 // on what platform we're on.
     68 static base::FilePath GetLibPeerConnectionPath() {
     69   base::FilePath path;
     70   CHECK(PathService::Get(base::DIR_MODULE, &path));
     71 #if defined(OS_WIN)
     72   path = path.Append(FILE_PATH_LITERAL("libpeerconnection.dll"));
     73 #elif defined(OS_MACOSX)
     74   // Simulate '@loader_path/Libraries'.
     75   path = path.Append(FILE_PATH_LITERAL("Libraries"))
     76              .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
     77 #elif defined(OS_ANDROID)
     78   path = path.Append(FILE_PATH_LITERAL("libpeerconnection.so"));
     79 #else
     80   path = path.Append(FILE_PATH_LITERAL("lib"))
     81              .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
     82 #endif
     83   return path;
     84 }
     85 
     86 bool InitializeWebRtcModule() {
     87   TRACE_EVENT0("webrtc", "InitializeWebRtcModule");
     88 
     89   if (g_create_webrtc_media_engine)
     90     return true;  // InitializeWebRtcModule has already been called.
     91 
     92   base::FilePath path(GetLibPeerConnectionPath());
     93   DVLOG(1) << "Loading WebRTC module: " << path.value();
     94 
     95   base::NativeLibraryLoadError error;
     96   static base::NativeLibrary lib = base::LoadNativeLibrary(path, &error);
     97 #if defined(OS_WIN)
     98   // We've been seeing problems on Windows with loading the DLL and we're
     99   // not sure exactly why.  It could be that AV programs are quarantining the
    100   // file or disallowing loading the DLL. To get a better picture of the errors
    101   // we're checking these specific error codes.
    102   if (error.code == ERROR_MOD_NOT_FOUND) {
    103     // It's possible that we get this error due to failure to load other
    104     // dependencies, so check first that libpeerconnection actually exists.
    105     CHECK(base::PathExists(path));  // libpeerconnection itself is missing.
    106     CHECK(lib);  // If we hit this, a dependency is missing.
    107   } else if (error.code == ERROR_ACCESS_DENIED) {
    108     CHECK(lib);  // AV blocking access?
    109   }
    110 #endif
    111 
    112   // Catch-all error handler for all other sorts of errors.
    113   CHECK(lib) << error.ToString();
    114 
    115   InitializeModuleFunction initialize_module =
    116       reinterpret_cast<InitializeModuleFunction>(
    117           base::GetFunctionPointerFromNativeLibrary(
    118               lib, "InitializeModule"));
    119 
    120   // Initialize the proxy by supplying it with a pointer to our
    121   // allocator/deallocator routines.
    122   // On mac we use malloc zones, which are global, so we provide NULLs for
    123   // the alloc/dealloc functions.
    124   // PS: This function is actually implemented in allocator_proxy.cc with the
    125   // new/delete overrides.
    126   InitDiagnosticLoggingDelegateFunctionFunction init_diagnostic_logging = NULL;
    127   bool init_ok = initialize_module(*CommandLine::ForCurrentProcess(),
    128 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
    129                                    &Allocate,
    130                                    &Dellocate,
    131 #endif
    132                                    &webrtc::field_trial::FindFullName,
    133                                    logging::GetLogMessageHandler(),
    134                                    &GetCategoryGroupEnabled,
    135                                    &AddTraceEvent,
    136                                    &g_create_webrtc_media_engine,
    137                                    &g_destroy_webrtc_media_engine,
    138                                    &init_diagnostic_logging);
    139 
    140   if (init_ok)
    141     rtc::SetExtraLoggingInit(init_diagnostic_logging);
    142   return init_ok;
    143 }
    144 
    145 cricket::MediaEngineInterface* CreateWebRtcMediaEngine(
    146     webrtc::AudioDeviceModule* adm,
    147     webrtc::AudioDeviceModule* adm_sc,
    148     cricket::WebRtcVideoEncoderFactory* encoder_factory,
    149     cricket::WebRtcVideoDecoderFactory* decoder_factory) {
    150   // For convenience of tests etc, we call InitializeWebRtcModule here.
    151   // For Chrome however, InitializeWebRtcModule must be called
    152   // explicitly before the sandbox is initialized.  In that case, this call is
    153   // effectively a noop.
    154   InitializeWebRtcModule();
    155   return g_create_webrtc_media_engine(adm, adm_sc, encoder_factory,
    156       decoder_factory);
    157 }
    158 
    159 void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {
    160   g_destroy_webrtc_media_engine(media_engine);
    161 }
    162 
    163 #endif  // LIBPEERCONNECTION_LIB
    164