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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "init_webrtc.h"
#include "base/command_line.h"
#include "base/debug/trace_event.h"
#include "base/file_util.h"
#include "base/files/file_path.h"
#include "base/metrics/field_trial.h"
#include "base/native_library.h"
#include "base/path_service.h"
#include "webrtc/base/basictypes.h"
#include "webrtc/base/logging.h"
const unsigned char* GetCategoryGroupEnabled(const char* category_group) {
return TRACE_EVENT_API_GET_CATEGORY_GROUP_ENABLED(category_group);
}
void AddTraceEvent(char phase,
const unsigned char* category_group_enabled,
const char* name,
unsigned long long id,
int num_args,
const char** arg_names,
const unsigned char* arg_types,
const unsigned long long* arg_values,
unsigned char flags) {
TRACE_EVENT_API_ADD_TRACE_EVENT(phase, category_group_enabled, name, id,
num_args, arg_names, arg_types, arg_values,
NULL, flags);
}
#if defined(LIBPEERCONNECTION_LIB)
// libpeerconnection is being compiled as a static lib. In this case
// we don't need to do any initializing but to keep things simple we
// provide an empty intialization routine so that this #ifdef doesn't
// have to be in other places.
bool InitializeWebRtcModule() {
webrtc::SetupEventTracer(&GetCategoryGroupEnabled, &AddTraceEvent);
return true;
}
// Define webrtc:field_trial::FindFullName to provide webrtc with a field trial
// implementation. When compiled as a static library this can be done directly
// and without pointers to functions.
namespace webrtc {
namespace field_trial {
std::string FindFullName(const std::string& trial_name) {
return base::FieldTrialList::FindFullName(trial_name);
}
} // namespace field_trial
} // namespace webrtc
#else // !LIBPEERCONNECTION_LIB
// When being compiled as a shared library, we need to bridge the gap between
// the current module and the libpeerconnection module, so things get a tad
// more complicated.
// Global function pointers to the factory functions in the shared library.
CreateWebRtcMediaEngineFunction g_create_webrtc_media_engine = NULL;
DestroyWebRtcMediaEngineFunction g_destroy_webrtc_media_engine = NULL;
// Returns the full or relative path to the libpeerconnection module depending
// on what platform we're on.
static base::FilePath GetLibPeerConnectionPath() {
base::FilePath path;
CHECK(PathService::Get(base::DIR_MODULE, &path));
#if defined(OS_WIN)
path = path.Append(FILE_PATH_LITERAL("libpeerconnection.dll"));
#elif defined(OS_MACOSX)
// Simulate '@loader_path/Libraries'.
path = path.Append(FILE_PATH_LITERAL("Libraries"))
.Append(FILE_PATH_LITERAL("libpeerconnection.so"));
#elif defined(OS_ANDROID)
path = path.Append(FILE_PATH_LITERAL("libpeerconnection.so"));
#else
path = path.Append(FILE_PATH_LITERAL("lib"))
.Append(FILE_PATH_LITERAL("libpeerconnection.so"));
#endif
return path;
}
bool InitializeWebRtcModule() {
TRACE_EVENT0("webrtc", "InitializeWebRtcModule");
if (g_create_webrtc_media_engine)
return true; // InitializeWebRtcModule has already been called.
base::FilePath path(GetLibPeerConnectionPath());
DVLOG(1) << "Loading WebRTC module: " << path.value();
base::NativeLibraryLoadError error;
static base::NativeLibrary lib = base::LoadNativeLibrary(path, &error);
#if defined(OS_WIN)
// We've been seeing problems on Windows with loading the DLL and we're
// not sure exactly why. It could be that AV programs are quarantining the
// file or disallowing loading the DLL. To get a better picture of the errors
// we're checking these specific error codes.
if (error.code == ERROR_MOD_NOT_FOUND) {
// It's possible that we get this error due to failure to load other
// dependencies, so check first that libpeerconnection actually exists.
CHECK(base::PathExists(path)); // libpeerconnection itself is missing.
CHECK(lib); // If we hit this, a dependency is missing.
} else if (error.code == ERROR_ACCESS_DENIED) {
CHECK(lib); // AV blocking access?
}
#endif
// Catch-all error handler for all other sorts of errors.
CHECK(lib) << error.ToString();
InitializeModuleFunction initialize_module =
reinterpret_cast<InitializeModuleFunction>(
base::GetFunctionPointerFromNativeLibrary(
lib, "InitializeModule"));
// Initialize the proxy by supplying it with a pointer to our
// allocator/deallocator routines.
// On mac we use malloc zones, which are global, so we provide NULLs for
// the alloc/dealloc functions.
// PS: This function is actually implemented in allocator_proxy.cc with the
// new/delete overrides.
InitDiagnosticLoggingDelegateFunctionFunction init_diagnostic_logging = NULL;
bool init_ok = initialize_module(*CommandLine::ForCurrentProcess(),
#if !defined(OS_MACOSX) && !defined(OS_ANDROID)
&Allocate, &Dellocate,
#endif
&base::FieldTrialList::FindFullName,
logging::GetLogMessageHandler(),
&GetCategoryGroupEnabled, &AddTraceEvent,
&g_create_webrtc_media_engine, &g_destroy_webrtc_media_engine,
&init_diagnostic_logging);
if (init_ok)
rtc::SetExtraLoggingInit(init_diagnostic_logging);
return init_ok;
}
cricket::MediaEngineInterface* CreateWebRtcMediaEngine(
webrtc::AudioDeviceModule* adm,
webrtc::AudioDeviceModule* adm_sc,
cricket::WebRtcVideoEncoderFactory* encoder_factory,
cricket::WebRtcVideoDecoderFactory* decoder_factory) {
// For convenience of tests etc, we call InitializeWebRtcModule here.
// For Chrome however, InitializeWebRtcModule must be called
// explicitly before the sandbox is initialized. In that case, this call is
// effectively a noop.
InitializeWebRtcModule();
return g_create_webrtc_media_engine(adm, adm_sc, encoder_factory,
decoder_factory);
}
void DestroyWebRtcMediaEngine(cricket::MediaEngineInterface* media_engine) {
g_destroy_webrtc_media_engine(media_engine);
}
#endif // LIBPEERCONNECTION_LIB
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