1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 //#define LOG_NDEBUG 0
18
19 #define LOG_TAG "AudioDeviceCallback-JNI"
20
21 #include <utils/Log.h>
22 #include <nativehelper/JNIHelp.h>
23 #include "core_jni_helpers.h"
24 #include <media/AudioSystem.h>
25
26 #include "android_media_DeviceCallback.h"
27
28
29 // ----------------------------------------------------------------------------
30
31 using namespace android;
32
JNIDeviceCallback(JNIEnv * env,jobject thiz,jobject weak_thiz,jmethodID postEventFromNative)33 JNIDeviceCallback::JNIDeviceCallback(JNIEnv* env, jobject thiz, jobject weak_thiz,
34 jmethodID postEventFromNative)
35 {
36
37 // Hold onto the AudioTrack/AudioRecord class for use in calling the static method
38 // that posts events to the application thread.
39 jclass clazz = env->GetObjectClass(thiz);
40 if (clazz == NULL) {
41 return;
42 }
43 mClass = (jclass)env->NewGlobalRef(clazz);
44
45 // We use a weak reference so the AudioTrack/AudioRecord object can be garbage collected.
46 // The reference is only used as a proxy for callbacks.
47 mObject = env->NewGlobalRef(weak_thiz);
48
49 mPostEventFromNative = postEventFromNative;
50 }
51
~JNIDeviceCallback()52 JNIDeviceCallback::~JNIDeviceCallback()
53 {
54 // remove global references
55 JNIEnv *env = AndroidRuntime::getJNIEnv();
56 if (env == NULL) {
57 return;
58 }
59 env->DeleteGlobalRef(mObject);
60 env->DeleteGlobalRef(mClass);
61 }
62
onAudioDeviceUpdate(audio_io_handle_t audioIo,const DeviceIdVector & deviceIds)63 void JNIDeviceCallback::onAudioDeviceUpdate(audio_io_handle_t audioIo,
64 const DeviceIdVector& deviceIds) {
65 JNIEnv *env = AndroidRuntime::getJNIEnv();
66 if (env == NULL) {
67 return;
68 }
69
70 ALOGV("%s audioIo %d deviceIds %s", __FUNCTION__, audioIo, toString(deviceIds).c_str());
71 // Java should query the new device ids once it gets the event.
72 // TODO(b/378505346): Pass the deviceIds to Java to avoid race conditions.
73 env->CallStaticVoidMethod(mClass, mPostEventFromNative, mObject,
74 AUDIO_NATIVE_EVENT_ROUTING_CHANGE, 0 /*arg1*/, 0 /*arg2*/,
75 NULL /*obj*/);
76 if (env->ExceptionCheck()) {
77 ALOGW("An exception occurred while notifying an event.");
78 env->ExceptionClear();
79 }
80 }
81