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 <nativehelper/JniConstants.h>
24 #include "core_jni_helpers.h"
25 #include <media/AudioSystem.h>
26
27 #include "android_media_DeviceCallback.h"
28
29
30 // ----------------------------------------------------------------------------
31
32 using namespace android;
33
JNIDeviceCallback(JNIEnv * env,jobject thiz,jobject weak_thiz,jmethodID postEventFromNative)34 JNIDeviceCallback::JNIDeviceCallback(JNIEnv* env, jobject thiz, jobject weak_thiz,
35 jmethodID postEventFromNative)
36 {
37
38 // Hold onto the AudioTrack/AudioRecord class for use in calling the static method
39 // that posts events to the application thread.
40 jclass clazz = env->GetObjectClass(thiz);
41 if (clazz == NULL) {
42 return;
43 }
44 mClass = (jclass)env->NewGlobalRef(clazz);
45
46 // We use a weak reference so the AudioTrack/AudioRecord object can be garbage collected.
47 // The reference is only used as a proxy for callbacks.
48 mObject = env->NewGlobalRef(weak_thiz);
49
50 mPostEventFromNative = postEventFromNative;
51 }
52
~JNIDeviceCallback()53 JNIDeviceCallback::~JNIDeviceCallback()
54 {
55 // remove global references
56 JNIEnv *env = AndroidRuntime::getJNIEnv();
57 if (env == NULL) {
58 return;
59 }
60 env->DeleteGlobalRef(mObject);
61 env->DeleteGlobalRef(mClass);
62 }
63
onAudioDeviceUpdate(audio_io_handle_t audioIo,audio_port_handle_t deviceId)64 void JNIDeviceCallback::onAudioDeviceUpdate(audio_io_handle_t audioIo,
65 audio_port_handle_t deviceId)
66 {
67 JNIEnv *env = AndroidRuntime::getJNIEnv();
68 if (env == NULL) {
69 return;
70 }
71
72 ALOGV("%s audioIo %d deviceId %d", __FUNCTION__, audioIo, deviceId);
73 env->CallStaticVoidMethod(mClass,
74 mPostEventFromNative,
75 mObject,
76 AUDIO_NATIVE_EVENT_ROUTING_CHANGE, deviceId, 0, NULL);
77 if (env->ExceptionCheck()) {
78 ALOGW("An exception occurred while notifying an event.");
79 env->ExceptionClear();
80 }
81 }
82
83