112 lines
4.3 KiB
C++
112 lines
4.3 KiB
C++
// Copyright 2019 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef MEDIAPIPE_ANDROID_UTIL_ASSET_MANAGER_UTIL_H_
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#define MEDIAPIPE_ANDROID_UTIL_ASSET_MANAGER_UTIL_H_
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#include <string>
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#include <vector>
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#ifdef __ANDROID__
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#include <android/asset_manager.h>
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#include <android/asset_manager_jni.h>
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#include <jni.h>
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#include "mediapipe/framework/port/canonical_errors.h"
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#include "mediapipe/framework/port/singleton.h"
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#include "mediapipe/framework/port/status.h"
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#include "mediapipe/framework/port/statusor.h"
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namespace mediapipe {
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// Thin wrapper over AAssetManager provided by JNI. This class is meant to be
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// used as a singleton.
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// Usage: Call InitializeFromActivity from a JNI function that has access to the
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// Java activity in the Android application. This initializes the asset manager
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// and now files bundled in the assets folder can be read using ReadFile().
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class AssetManager {
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public:
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AssetManager(const AssetManager&) = delete;
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AssetManager& operator=(const AssetManager&) = delete;
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// Returns the asset manager if it has been set by a call to
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// InitializeFromActivity, otherwise returns nullptr.
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AAssetManager* GetAssetManager();
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// Returns true if AAssetManager was successfully initialized.
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bool InitializeFromAssetManager(JNIEnv* env, jobject local_asset_manager,
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const std::string& cache_dir_path);
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// Returns true if AAssetManager was successfully initialized.
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// cache_dir_path should be set to activity.getCacheDir().getAbsolutePath().
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// We could get it from the activity, but we have the Java layer pass it
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// directly for convenience.
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bool InitializeFromActivity(JNIEnv* env, jobject activity,
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const std::string& cache_dir_path);
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// Returns true if AAssetManager was successfully initialized.
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ABSL_DEPRECATED("Use InitializeFromActivity instead.")
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bool InitializeFromAssetManager(JNIEnv* env, jobject local_asset_manager);
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// Returns true if AAssetManager was successfully initialized.
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// cache_dir_path should be set to context.getCacheDir().getAbsolutePath().
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// We could get it from the context, but we have the Java layer pass it
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// directly for convenience.
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bool InitializeFromContext(JNIEnv* env, jobject context,
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const std::string& cache_dir_path);
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// Checks if a file exists. Returns true on success, false otherwise. If it
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// does exist, then 'is_dir' will be set to indicate whether the file is a
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// directory.
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bool FileExists(const std::string& filename, bool* is_dir = nullptr);
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// Reads a file into output. Returns true on success, false otherwise.
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bool ReadFile(const std::string& filename, std::string* output);
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// Reads the raw bytes referred to by the supplied content URI. Returns true
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// on success, false otherwise.
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absl::Status ReadContentUri(const std::string& content_uri,
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std::string* output);
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// Returns the path to the Android cache directory. Will be empty if
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// InitializeFromActivity has not been called.
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const std::string& GetCacheDirPath();
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// Caches the contents of the given asset as a file, and returns a path to
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// that file. This can be used to pass an asset to APIs that require a path
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// to a filesystem file.
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absl::StatusOr<std::string> CachedFileFromAsset(
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const std::string& asset_path);
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private:
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// Private constructor since this class is meant to be a singleton.
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AssetManager() = default;
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// Pointer to asset manager from JNI.
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AAssetManager* asset_manager_ = nullptr;
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// The context from which assets should be loaded.
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jobject context_;
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// Path to the Android cache directory for our context.
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std::string cache_dir_path_;
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friend class Singleton<AssetManager>;
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};
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} // namespace mediapipe
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#endif // __ANDROID__
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#endif // MEDIAPIPE_ANDROID_UTIL_ASSET_MANAGER_UTIL_H_
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