nativemidi: Prototype demonstrating native access to IMidiDeviceServer (c276c59e) · Commits · e / os / android_frameworks_base

media/java/android/media/midi/MidiDevice.java

+43 −0

Original line number	Diff line number	Diff line
		@@ -35,6 +35,10 @@ import java.io.IOException;
		* Instances of this class are created by {@link MidiManager#openDevice}.
		*/
		public final class MidiDevice implements Closeable {
		static {
		System.loadLibrary("media_jni");
		}

		private static final String TAG = "MidiDevice";

		private final MidiDeviceInfo mDeviceInfo;
		@@ -43,6 +47,7 @@ public final class MidiDevice implements Closeable {
		private final IBinder mClientToken;
		private final IBinder mDeviceToken;
		private boolean mIsDeviceClosed;
		private boolean mIsMirroredToNative;

		private final CloseGuard mGuard = CloseGuard.get();

		@@ -209,10 +214,45 @@ public final class MidiDevice implements Closeable {
		}
		}

		/**
		* Makes Midi Device available to the Native API
		* @hide
		*/
		public void mirrorToNative() throws IOException {
		if (mIsDeviceClosed \|\| mIsMirroredToNative) {
		return;
		}

		int result = mirrorToNative(mDeviceServer.asBinder(), mDeviceInfo.getId());
		if (result != 0) {
		throw new IOException("Failed mirroring to native: " + result);
		}

		mIsMirroredToNative = true;
		}

		/**
		* Makes Midi Device no longer available to the Native API
		* @hide
		*/
		public void removeFromNative() throws IOException {
		if (!mIsMirroredToNative) {
		return;
		}

		int result = removeFromNative(mDeviceInfo.getId());
		if (result != 0) {
		throw new IOException("Failed removing from native: " + result);
		}

		mIsMirroredToNative = false;
		}

		@Override
		public void close() throws IOException {
		synchronized (mGuard) {
		if (!mIsDeviceClosed) {
		removeFromNative();
		mGuard.close();
		mIsDeviceClosed = true;
		try {
		@@ -238,4 +278,7 @@ public final class MidiDevice implements Closeable {
		public String toString() {
		return ("MidiDevice: " + mDeviceInfo.toString());
		}

		private native int mirrorToNative(IBinder deviceServerBinder, int uid);
		private native int removeFromNative(int uid);
		}

media/jni/Android.mk

+3 −0

Original line number	Diff line number	Diff line
		@@ -26,6 +26,7 @@ LOCAL_SRC_FILES:= \
		android_mtp_MtpDatabase.cpp \
		android_mtp_MtpDevice.cpp \
		android_mtp_MtpServer.cpp \
		midi/android_media_midi_MidiDevice.cpp \

		LOCAL_SHARED_LIBRARIES := \
		libandroid_runtime \
		@@ -34,6 +35,7 @@ LOCAL_SHARED_LIBRARIES := \
		libbinder \
		libmedia \
		libmediadrm \
		libmidi \
		libskia \
		libui \
		liblog \
		@@ -55,6 +57,7 @@ LOCAL_C_INCLUDES += \
		external/tremor/Tremor \
		frameworks/base/core/jni \
		frameworks/base/libs/hwui \
		frameworks/base/media/native \
		frameworks/av/media/libmedia \
		frameworks/av/media/libstagefright \
		frameworks/av/media/mtp \

media/jni/midi/android_media_midi_MidiDevice.cpp

0 → 100644

+49 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2017 The Android Open Source Project
		*
		* Licensed under the Apache License, Version 2.0 (the "License");
		* you may not use this file except in compliance with the License.
		* You may obtain a copy of the License at
		*
		* http://www.apache.org/licenses/LICENSE-2.0
		*
		* Unless required by applicable law or agreed to in writing, software
		* distributed under the License is distributed on an "AS IS" BASIS,
		* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		* See the License for the specific language governing permissions and
		* limitations under the License.
		*/

		//#define LOG_NDEBUG 0
		#define LOG_TAG "Midi-JNI"

		#include <android_util_Binder.h>
		#include <midi/MidiDeviceRegistry.h>
		#include <nativehelper/jni.h>
		#include <utils/Log.h>

		using namespace android;
		using namespace android::media::midi;

		extern "C" jint Java_android_media_midi_MidiDevice_mirrorToNative(
		JNIEnv *env, jobject thiz, jobject midiDeviceServer, jint id)
		{
		(void)thiz;
		sp<IBinder> serverBinder = ibinderForJavaObject(env, midiDeviceServer);
		if (serverBinder.get() == NULL) {
		ALOGE("Could not obtain IBinder from passed jobject");
		return -EINVAL;
		}
		// return MidiDeviceManager::getInstance().addDevice(serverBinder, uid);
		return MidiDeviceRegistry::getInstance().addDevice(
		new BpMidiDeviceServer(serverBinder), id);
		}

		extern "C" jint Java_android_media_midi_MidiDevice_removeFromNative(
		JNIEnv *env, jobject thiz, jint uid)
		{
		(void)env;
		(void)thiz;
		// return MidiDeviceManager::getInstance().removeDevice(uid);
		return MidiDeviceRegistry::getInstance().removeDevice(uid);
		}

media/native/midi/Android.bp

0 → 100644

+21 −0

Original line number	Diff line number	Diff line
		// Copyright (C) 2017 The Android Open Source Project
		//
		// Licensed under the Apache License, Version 2.0 (the "License");
		// you may not use this file except in compliance with the License.
		// You may obtain a copy of the License at
		//
		// http://www.apache.org/licenses/LICENSE-2.0
		//
		// Unless required by applicable law or agreed to in writing, software
		// distributed under the License is distributed on an "AS IS" BASIS,
		// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
		// See the License for the specific language governing permissions and
		// limitations under the License.

		// The headers module is in frameworks/media/native/midi/Android.bp.
		ndk_library {
		name: "libmidi.ndk",
		symbol_file: "libmidi.map.txt",
		first_version: "26",
		// unversioned_until: "current",
		}

media/native/midi/Android.mk

0 → 100644

+22 −0

Original line number	Diff line number	Diff line
		LOCAL_PATH:= $(call my-dir)

		include $(CLEAR_VARS)

		LOCAL_SRC_FILES := \
		../../java/android/media/midi/IMidiDeviceServer.aidl \
		midi.cpp \
		MidiDeviceRegistry.cpp \
		MidiPortRegistry.cpp

		LOCAL_AIDL_INCLUDES := \
		$(FRAMEWORKS_BASE_JAVA_SRC_DIRS) \
		frameworks/native/aidl/binder

		LOCAL_CFLAGS += -Wall -Werror -O0

		LOCAL_MODULE := libmidi
		LOCAL_MODULE_TAGS := optional

		LOCAL_SHARED_LIBRARIES := liblog libbinder libutils libmedia

		include $(BUILD_SHARED_LIBRARY)