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// Copyright (c) 2010 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 "base/file_path.h"
#include "base/logging.h"
#include "base/native_library.h"
#include "base/path_service.h"
#include "base/scoped_ptr.h"
// Enable timing code by turning on TESTING macro.
//#define TESTING 1
#ifdef TESTING
#include "base/string_util.h"
#include "base/time.h"
#endif
namespace media {
namespace {
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.
FilePath::CharType* GetDLLName(FFmpegDLLKeys dll_key) {
// TODO(ajwong): Do we want to lock to a specific ffmpeg version?
switch (dll_key) {
case FILE_LIBAVCODEC:
return FILE_PATH_LITERAL("avcodec-52.dll");
case FILE_LIBAVFORMAT:
return FILE_PATH_LITERAL("avformat-52.dll");
case FILE_LIBAVUTIL:
return FILE_PATH_LITERAL("avutil-50.dll");
default:
LOG(DFATAL) << "Invalid DLL key requested: " << dll_key;
return FILE_PATH_LITERAL("");
}
}
} // namespace
// Address of vpx_codec_vp8_cx_algo.
static void* vp8_cx_algo_address = NULL;
// 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) {
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.Append(GetDLLName(path_keys[i]));
#ifdef TESTING
base::TimeTicks dll_loadtime_start = base::TimeTicks::HighResNow();
#endif
// 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;
#ifdef TESTING
base::TimeTicks dll_loadtime_end = base::TimeTicks::HighResNow();
std::wstring outputbuf = StringPrintf(L"DLL loadtime %5.2f ms, %ls\n",
(dll_loadtime_end - dll_loadtime_start).InMillisecondsF(),
cpath);
OutputDebugStringW(outputbuf.c_str());
#endif
}
// TODO(hclam): This is temporary to obtain address of
// vpx_codec_vp8_cx_algo. This should be removed once libvpx has a
// getter method for it.
base::NativeLibrary avcodec_lib =
base::LoadNativeLibrary(FilePath(GetDLLName(media::FILE_LIBAVCODEC)));
if (avcodec_lib) {
vp8_cx_algo_address = base::GetFunctionPointerFromNativeLibrary(
avcodec_lib, "vpx_codec_vp8_cx_algo");
}
// 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.
if (libs[arraysize(libs)-1])
return true;
// 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;
}
bool InitializeOpenMaxLibrary(const FilePath& module_dir) {
NOTIMPLEMENTED() << "OpenMAX is not used in Windows.";
return false;
}
void* GetVp8CxAlgoAddress() {
return vp8_cx_algo_address;
}
} // namespace media
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