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// Copyright (c) 2012 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 "media/base/media.h"
#include <windows.h>
#if defined(_WIN32_WINNT_WIN8)
// The Windows 8 SDK defines FACILITY_VISUALCPP in winerror.h.
#undef FACILITY_VISUALCPP
#endif
#include <delayimp.h>
#include "base/file_path.h"
#include "base/logging.h"
#include "base/native_library.h"
#include "base/path_service.h"
#pragma comment(lib, "delayimp.lib")
namespace media {
// FFmpeg library name.
static const char* kFFmpegDLL = "ffmpegsumo.dll";
// Use a global to indicate whether the library has been initialized or not. We
// rely on function level static initialization in InitializeMediaLibrary() to
// guarantee this is only set once in a thread safe manner.
static bool g_media_library_is_initialized = false;
static bool InitializeMediaLibraryInternal(const FilePath& base_path) {
DCHECK(!g_media_library_is_initialized);
// LoadLibraryEx(..., LOAD_WITH_ALTERED_SEARCH_PATH) cannot handle
// relative path.
if (!base_path.IsAbsolute())
return false;
// Use alternate DLL search path so we don't load dependencies from the
// system path. Refer to http://crbug.com/35857
HMODULE lib = ::LoadLibraryEx(
base_path.AppendASCII(kFFmpegDLL).value().c_str(), NULL,
LOAD_WITH_ALTERED_SEARCH_PATH);
// Check that we loaded the library successfully.
g_media_library_is_initialized = (lib != NULL);
return g_media_library_is_initialized;
}
bool InitializeMediaLibrary(const FilePath& base_path) {
static const bool kMediaLibraryInitialized =
InitializeMediaLibraryInternal(base_path);
DCHECK_EQ(kMediaLibraryInitialized, g_media_library_is_initialized);
return kMediaLibraryInitialized;
}
void InitializeMediaLibraryForTesting() {
FilePath file_path;
CHECK(PathService::Get(base::DIR_EXE, &file_path));
CHECK(InitializeMediaLibrary(file_path));
}
bool IsMediaLibraryInitialized() {
return g_media_library_is_initialized;
}
} // namespace media
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