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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/file_util.h"
     10 #include "base/files/file_path.h"
     11 #include "base/metrics/field_trial.h"
     12 #include "base/native_library.h"
     13 #include "base/path_service.h"
     14 #include "talk/base/basictypes.h"
     15 #include "third_party/libjingle/overrides/talk/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 #if defined(LIBPEERCONNECTION_LIB)
     36 
     37 // libpeerconnection is being compiled as a static lib.  In this case
     38 // we don't need to do any initializing but to keep things simple we
     39 // provide an empty intialization routine so that this #ifdef doesn't
     40 // have to be in other places.
     41 bool InitializeWebRtcModule() {
     42   webrtc::SetupEventTracer(&GetCategoryGroupEnabled, &AddTraceEvent);
     43   return true;
     44 }
     45 
     46 // Define webrtc:field_trial::FindFullName to provide webrtc with a field trial
     47 // implementation. When compiled as a static library this can be done directly
     48 // and without pointers to functions.
     49 namespace webrtc {
     50 namespace field_trial {
     51 std::string FindFullName(const std::string& trial_name) {
     52   return base::FieldTrialList::FindFullName(trial_name);
     53 }
     54 }  // namespace field_trial
     55 }  // namespace webrtc
     56 
     57 #else  // !LIBPEERCONNECTION_LIB
     58 
     59 // When being compiled as a shared library, we need to bridge the gap between
     60 // the current module and the libpeerconnection module, so things get a tad
     61 // more complicated.
     62 
     63 // Global function pointers to the factory functions in the shared library.
     64 CreateWebRtcMediaEngineFunction g_create_webrtc_media_engine = NULL;
     65 DestroyWebRtcMediaEngineFunction g_destroy_webrtc_media_engine = NULL;
     66 
     67 // Returns the full or relative path to the libpeerconnection module depending
     68 // on what platform we're on.
     69 static base::FilePath GetLibPeerConnectionPath() {
     70   base::FilePath path;
     71   CHECK(PathService::Get(base::DIR_MODULE, &path));
     72 #if defined(OS_WIN)
     73   path = path.Append(FILE_PATH_LITERAL("libpeerconnection.dll"));
     74 #elif defined(OS_MACOSX)
     75   // Simulate '@loader_path/Libraries'.
     76   path = path.Append(FILE_PATH_LITERAL("Libraries"))
     77              .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
     78 #elif defined(OS_ANDROID)
     79   path = path.Append(FILE_PATH_LITERAL("libpeerconnection.so"));
     80 #else
     81   path = path.Append(FILE_PATH_LITERAL("lib"))
     82              .Append(FILE_PATH_LITERAL("libpeerconnection.so"));
     83 #endif
     84   return path;
     85 }
     86 
     87 bool InitializeWebRtcModule() {
     88   TRACE_EVENT0("webrtc", "InitializeWebRtcModule");
     89 
     90   if (g_create_webrtc_media_engine)
     91     return true;  // InitializeWebRtcModule has already been called.
     92 
     93   base::FilePath path(GetLibPeerConnectionPath());
     94   DVLOG(1) << "Loading WebRTC module: " << path.value();
     95 
     96   base::NativeLibraryLoadError error;
     97   static base::NativeLibrary lib = base::LoadNativeLibrary(path, &error);
     98 #if defined(OS_WIN)
     99   // We've been seeing problems on Windows with loading the DLL and we're
    100   // not sure exactly why.  It could be that AV programs are quarantining the
    101   // file or disallowing loading the DLL. To get a better picture of the errors
    102   // we're checking these specific error codes.
    103   if (error.code == ERROR_MOD_NOT_FOUND) {
    104     // It's possible that we get this error due to failure to load other
    105     // dependencies, so check first that libpeerconnection actually exists.
    106     CHECK(base::PathExists(path));  // libpeerconnection itself is missing.
    107     CHECK(lib);  // If we hit this, a dependency is missing.
    108   } else if (error.code == ERROR_ACCESS_DENIED) {
    109     CHECK(lib);  // AV blocking access?
    110   }
    111 #endif
    112 
    113   // Catch-all error handler for all other sorts of errors.
    114   CHECK(lib) << error.ToString();
    115 
    116   InitializeModuleFunction initialize_module =
    117       reinterpret_cast<InitializeModuleFunction>(
    118           base::GetFunctionPointerFromNativeLibrary(
    119               lib, "InitializeModule"));
    120 
    121   // Initialize the proxy by supplying it with a pointer to our
    122   // allocator/deallocator routines.
    123   // On mac we use malloc zones, which are global, so we provide NULLs for
    124   // the alloc/dealloc functions.
    125   // PS: This function is actually implemented in allocator_proxy.cc with the
    126   // new/delete overrides.
    127   InitDiagnosticLoggingDelegateFunctionFunction init_diagnostic_logging = NULL;
    128   bool init_ok = initialize_module(*CommandLine::ForCurrentProcess(),
    129 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
    130       &Allocate, &Dellocate,
    131 #endif
    132       &base::FieldTrialList::FindFullName,
    133       logging::GetLogMessageHandler(),
    134       &GetCategoryGroupEnabled, &AddTraceEvent,
    135       &g_create_webrtc_media_engine, &g_destroy_webrtc_media_engine,
    136       &init_diagnostic_logging);
    137 
    138   if (init_ok)
    139     talk_base::SetExtraLoggingInit(init_diagnostic_logging);
    140   return init_ok;
    141 }
    142 
    143 cricket::MediaEngineInterface* CreateWebRtcMediaEngine(
    144     webrtc::AudioDeviceModule* adm,
    145     webrtc::AudioDeviceModule* adm_sc,
    146     cricket::WebRtcVideoEncoderFactory* encoder_factory,
    147     cricket::WebRtcVideoDecoderFactory* decoder_factory) {
    148   // For convenience of tests etc, we call InitializeWebRtcModule here.
    149   // For Chrome however, InitializeWebRtcModule must be called
    150   // explicitly before the sandbox is initialized.  In that case, this call is
    151   // effectively a noop.
    152   InitializeWebRtcModule();
    153   return g_create_webrtc_media_engine(adm, adm_sc, encoder_factory,
    154       decoder_factory);
    155 }
    156 
    157 void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {
    158   g_destroy_webrtc_media_engine(media_engine);
    159 }
    160 
    161 #endif  // LIBPEERCONNECTION_LIB
    162