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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 <string>
#include "base/file_path.h"
#include "base/logging.h"
#include "base/path_service.h"
#include "base/strings/stringize_macros.h"
#include "media/ffmpeg/ffmpeg_common.h"
#if !defined(USE_SYSTEM_FFMPEG)
#include "third_party/ffmpeg/ffmpeg_stubs.h"
using third_party_ffmpeg::kNumStubModules;
using third_party_ffmpeg::kModuleFfmpegsumo;
using third_party_ffmpeg::InitializeStubs;
using third_party_ffmpeg::StubPathMap;
#endif // !defined(USE_SYSTEM_FFMPEG)
namespace media {
// Handy to prevent shooting ourselves in the foot with macro wizardry.
#if !defined(LIBAVCODEC_VERSION_MAJOR) || \
!defined(LIBAVFORMAT_VERSION_MAJOR) || \
!defined(LIBAVUTIL_VERSION_MAJOR)
#error FFmpeg headers not included!
#endif
#define AVCODEC_VERSION STRINGIZE(LIBAVCODEC_VERSION_MAJOR)
#define AVFORMAT_VERSION STRINGIZE(LIBAVFORMAT_VERSION_MAJOR)
#define AVUTIL_VERSION STRINGIZE(LIBAVUTIL_VERSION_MAJOR)
#if defined(OS_MACOSX)
// TODO(evan): should be using .so like ffmepgsumo here.
#define DSO_NAME(MODULE, VERSION) ("lib" MODULE "." VERSION ".dylib")
static const FilePath::CharType kSumoLib[] =
FILE_PATH_LITERAL("ffmpegsumo.so");
#elif defined(OS_POSIX)
#define DSO_NAME(MODULE, VERSION) ("lib" MODULE ".so." VERSION)
static const FilePath::CharType kSumoLib[] =
FILE_PATH_LITERAL("libffmpegsumo.so");
#else
#error "Do not know how to construct DSO name for this OS."
#endif
// 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& module_dir) {
DCHECK(!g_media_library_is_initialized);
#if defined(USE_SYSTEM_FFMPEG)
// No initialization is necessary when using system ffmpeg,
// we just link directly with system ffmpeg libraries.
g_media_library_is_initialized = true;
#else
StubPathMap paths;
// First try to initialize with Chrome's sumo library.
DCHECK_EQ(kNumStubModules, 1);
paths[kModuleFfmpegsumo].push_back(module_dir.Append(kSumoLib).value());
// If that fails, see if any system libraries are available.
paths[kModuleFfmpegsumo].push_back(module_dir.Append(
FILE_PATH_LITERAL(DSO_NAME("avutil", AVUTIL_VERSION))).value());
paths[kModuleFfmpegsumo].push_back(module_dir.Append(
FILE_PATH_LITERAL(DSO_NAME("avcodec", AVCODEC_VERSION))).value());
paths[kModuleFfmpegsumo].push_back(module_dir.Append(
FILE_PATH_LITERAL(DSO_NAME("avformat", AVFORMAT_VERSION))).value());
g_media_library_is_initialized = InitializeStubs(paths);
#endif // !defined(USE_SYSTEM_FFMPEG)
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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