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
32using namespace android;
33
34JNIDeviceCallback::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
53JNIDeviceCallback::~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
64void 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