[automerge] Move common JNI code out of AudioTrack 2p: 26845c3dfd (e8678551) · Commits · e / os / android_frameworks_base

core/jni/android_media_AudioTrack.cpp

+8 −39

Original line number	Diff line number	Diff line
		@@ -37,6 +37,7 @@
		#include "android_media_AudioFormat.h"
		#include "android_media_AudioTrackCallback.h"
		#include "android_media_DeviceCallback.h"
		#include "android_media_JNIUtils.h"
		#include "android_media_MediaMetricsJNI.h"
		#include "android_media_PlaybackParams.h"
		#include "android_media_VolumeShaper.h"
		@@ -82,7 +83,7 @@ class AudioTrackCallbackImpl : public AudioTrack::IAudioTrackCallback {
		AudioTrackCallbackImpl(jclass audioTrackClass, jobject audioTrackWeakRef, bool isOffload)
		: mIsOffload(isOffload)
		{
		const auto env = getJNIEnv();
		const auto env = getJNIEnvOrDie();
		mAudioTrackClass = (jclass)env->NewGlobalRef(audioTrackClass);
		// we use a weak reference so the AudioTrack object can be garbage collected.
		mAudioTrackWeakRef = env->NewGlobalRef(audioTrackWeakRef);
		@@ -92,7 +93,7 @@ class AudioTrackCallbackImpl : public AudioTrack::IAudioTrackCallback {
		AudioTrackCallbackImpl(const AudioTrackCallbackImpl&) = delete;
		AudioTrackCallbackImpl& operator=(const AudioTrackCallbackImpl&) = delete;
		~AudioTrackCallbackImpl() {
		const auto env = getJNIEnv();
		const auto env = getJNIEnvOrDie();
		env->DeleteGlobalRef(mAudioTrackClass);
		env->DeleteGlobalRef(mAudioTrackWeakRef);
		}
		@@ -129,16 +130,9 @@ class AudioTrackCallbackImpl : public AudioTrack::IAudioTrackCallback {
		protected:
		jobject mAudioTrackWeakRef;
		private:
		JNIEnv* getJNIEnv() {
		auto jni = AndroidRuntime::getJNIEnv();
		if (jni == nullptr) {
		LOG_ALWAYS_FATAL("AudioTrackCallback thread JNI reference is null");
		}
		return jni;
		}

		void postEvent(int event, int arg = 0) {
		auto env = getJNIEnv();
		auto env = getJNIEnvOrDie();
		env->CallStaticVoidMethod(
		mAudioTrackClass,
		javaAudioTrackFields.postNativeEventInJava,
		@@ -216,7 +210,6 @@ public:
		static void initCheckOrDie(JNIEnv *env) { (void)getIds(env); }
		};

		static Mutex sLock;

		// ----------------------------------------------------------------------------
		#define DEFAULT_OUTPUT_SAMPLE_RATE 44100
		@@ -235,32 +228,6 @@ sp<IMemory> allocSharedMem(int sizeInBytes) {
		}
		return sp<MemoryBase>::make(heap, 0, sizeInBytes);
		}
		// TODO(b/218351957) move somewhere?
		template<typename T>
		sp<T> getFieldSp(JNIEnv* env, jobject thiz, jfieldID id)
		{
		// make these fields atomic longs on the java side
		Mutex::Autolock l(sLock);
		return sp<T>::fromExisting(reinterpret_cast<T*>(env->GetLongField(thiz, id)));
		}

		// This (semantically) should only be called on AudioTrack creation and release
		template <typename T>
		sp<T> setFieldSp(JNIEnv* env, jobject thiz, const sp<T>& at, jfieldID id)
		{
		Mutex::Autolock l(sLock);
		// I don't think this synchronization actually prevents a race
		// We can still invalidate under our feet in release
		sp<T> old = sp<T>::fromExisting(reinterpret_cast<T*>(env->GetLongField(thiz, id)));
		if (at.get()) {
		at->incStrong((void*)setFieldSp<T>);
		}
		if (old != 0) {
		old->decStrong((void*)setFieldSp<T>);
		}
		env->SetLongField(thiz, id, (jlong)at.get());
		return old;
		}

		sp<AudioTrack> getAudioTrack(JNIEnv* env, jobject thiz) {
		return getFieldSp<AudioTrack>(env, thiz, javaAudioTrackFields.nativeTrackInJavaObj);
		@@ -268,8 +235,9 @@ sp<AudioTrack> getAudioTrack(JNIEnv* env, jobject thiz) {

		} // anonymous
		// ----------------------------------------------------------------------------
		// For MediaSync
		sp<AudioTrack> android_media_AudioTrack_getAudioTrack(JNIEnv* env, jobject audioTrackObj) {
		return getFieldSp<AudioTrack>(env, audioTrackObj, javaAudioTrackFields.nativeTrackInJavaObj);
		return getAudioTrack(env, audioTrackObj);
		}

		// ----------------------------------------------------------------------------
		@@ -524,8 +492,9 @@ native_init_failure:
		if (nSession != NULL) {
		env->ReleasePrimitiveArrayCritical(jSession, nSession, 0);
		}
		env->SetLongField(thiz, javaAudioTrackFields.jniData, 0);

		setFieldSp(env, thiz, sp<AudioTrack>{}, javaAudioTrackFields.nativeTrackInJavaObj);
		setFieldSp(env, thiz, sp<AudioTrackJniStorage>{}, javaAudioTrackFields.jniData);
		// lpTrack goes out of scope, so reference count drops to zero
		return (jint) AUDIOTRACK_ERROR_SETUP_NATIVEINITFAILED;
		}

core/jni/android_media_JNIUtils.h

0 → 100644

+68 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2022 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.
		*/

		#pragma once

		#include <jni.h>

		#include <mutex>

		#include <android_runtime/AndroidRuntime.h>
		#include <log/log_main.h>
		#include <utils/RefBase.h>

		namespace android {

		// TODO (b/218351957) remove static lock
		// This lock is intentionally static, it is local to each TU which is
		// responsible for a single Java class.
		static std::mutex sFieldSpLock;

		// getFieldSp and setFieldSp are used to logically represent an owning reference
		// to a native object from across the JNI. The data (underlying ptr) is stored
		// in a field in the Java object as a long. Setting a Java field to a sp
		// involves incrementing the reference count to prevent object destruction.
		// Resetting the field decrements the reference count to avoid memory leaks.

		template <typename T>
		sp<T> getFieldSp(JNIEnv* env, jobject thiz, jfieldID id) {
		const std::lock_guard l{sFieldSpLock};
		return sp<T>::fromExisting(reinterpret_cast<T*>(env->GetLongField(thiz, id)));
		}

		template <typename T>
		sp<T> setFieldSp(JNIEnv* env, jobject thiz, const sp<T>& newSp, jfieldID id) {
		const std::lock_guard l{sFieldSpLock};
		sp<T> old = sp<T>::fromExisting(reinterpret_cast<T*>(env->GetLongField(thiz, id)));
		if (newSp) {
		newSp->incStrong((void*)setFieldSp<T>);
		}
		if (old) {
		old->decStrong((void*)setFieldSp<T>);
		}
		env->SetLongField(thiz, id, (jlong)newSp.get());
		return old;
		}

		inline JNIEnv* getJNIEnvOrDie() {
		const auto env = AndroidRuntime::getJNIEnv();
		LOG_ALWAYS_FATAL_IF(env == nullptr,
		"Thread JNI reference is null. Thread not prepared for Java.");
		return env;
		}


		} // namespace android