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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>
#include <delayimp.h>
#include "base/file_path.h"
#include "base/logging.h"
#include "base/memory/scoped_ptr.h"
#include "base/native_library.h"
#include "base/path_service.h"
#pragma comment(lib, "delayimp.lib")
namespace media {
enum FFmpegDLLKeys {
FILE_LIBAVCODEC, // full path to libavcodec media decoding library.
FILE_LIBAVFORMAT, // full path to libavformat media parsing library.
FILE_LIBAVUTIL, // full path to libavutil media utility library.
};
// Retrieves the DLLName for the given key.
static const char* GetDLLName(FFmpegDLLKeys dll_key) {
// TODO(ajwong): Do we want to lock to a specific ffmpeg version?
switch (dll_key) {
case FILE_LIBAVCODEC:
return "avcodec-53.dll";
case FILE_LIBAVFORMAT:
return "avformat-53.dll";
case FILE_LIBAVUTIL:
return "avutil-51.dll";
default:
LOG(DFATAL) << "Invalid DLL key requested: " << dll_key;
return "";
}
}
static bool g_media_library_is_initialized = false;
// Attempts to initialize the media library (loading DLLs, DSOs, etc.).
// Returns true if everything was successfully initialized, false otherwise.
bool InitializeMediaLibrary(const FilePath& base_path) {
if (g_media_library_is_initialized)
return true;
// LoadLibraryEx(..., LOAD_WITH_ALTERED_SEARCH_PATH) cannot handle
// relative path.
if (!base_path.IsAbsolute())
return false;
FFmpegDLLKeys path_keys[] = {
media::FILE_LIBAVCODEC,
media::FILE_LIBAVFORMAT,
media::FILE_LIBAVUTIL
};
HMODULE libs[arraysize(path_keys)] = {NULL};
for (size_t i = 0; i < arraysize(path_keys); ++i) {
FilePath path = base_path.AppendASCII(GetDLLName(path_keys[i]));
// Use alternate DLL search path so we don't load dependencies from the
// system path. Refer to http://crbug.com/35857
const wchar_t* cpath = path.value().c_str();
libs[i] = ::LoadLibraryEx(cpath, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
if (!libs[i])
break;
}
// Check that we loaded all libraries successfully. We only need to check the
// last array element because the loop above will break without initializing
// it on any prior error.
bool media_library_is_initialized = (libs[arraysize(libs) - 1] != NULL);
if (!media_library_is_initialized) {
// Free any loaded libraries if we weren't successful.
for (size_t i = 0; i < arraysize(libs) && libs[i] != NULL; ++i) {
FreeLibrary(libs[i]);
libs[i] = NULL; // Just to be safe.
}
return false;
}
// Workaround for http://crbug.com/110983
// LoadLibrary() sometimes AV's when called by delay load helper when we
// call function in ffmpeg for the first time, and we don't know why.
// Force delay load helper to fix import table here instead.
// Theoretically, there is no need to call LoadLibrary() before
// __HrLoadAllImportsForDll(), it will call LoadLibrary() itself, but there
// is no way to specify LOAD_WITH_ALTERED_SEARCH_PATH when calling
// __HrLoadAllImportsForDll(). So we do everything in 2 steps -- first call
// LoadLibraryEx(..., LOAD_WITH_ALTERED_SEARCH_PATH), then call
// __HrLoadAllImportsForDll(). Overhead is negligible compared to disk
// access time.
// Note: in case of error we are not unloading DLL because unload requires
// extra resources and should not be necessary; if we ever decide to
// unload by calling __FUnloadDelayLoadedDLL() please add /DELAY:UNLOAD
// to the linker command line.
// TODO(enal): remove that code when we find underlying issue. Delay load
// should work if library is alreday in memory, regardless of permissions...
for (size_t i = 0; i < arraysize(path_keys); ++i) {
if (FAILED(::__HrLoadAllImportsForDll(GetDLLName(path_keys[i]))))
media_library_is_initialized = false;
}
g_media_library_is_initialized = media_library_is_initialized;
return media_library_is_initialized;
}
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;
}
bool InitializeOpenMaxLibrary(const FilePath& module_dir) {
NOTIMPLEMENTED() << "OpenMAX is not used in Windows.";
return false;
}
} // namespace media
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