1 /*
2 * Copyright (C) 2020 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 "AudioTrackCallback-JNI"
20
21 #include <algorithm>
22
23 #include <nativehelper/JNIHelp.h>
24 #include <utils/Errors.h>
25 #include <utils/Log.h>
26
27 #include "android_media_AudioTrackCallback.h"
28 #include "core_jni_helpers.h"
29
30 using namespace android;
31
32 #define BYTE_BUFFER_NAME "java/nio/ByteBuffer"
33 #define BYTE_BUFFER_ALLOCATE_DIRECT_NAME "allocateDirect"
34
JNIAudioTrackCallback(JNIEnv * env,jobject thiz,jobject weak_thiz,jmethodID postEventFromNative)35 JNIAudioTrackCallback::JNIAudioTrackCallback(JNIEnv* env, jobject thiz, jobject weak_thiz,
36 jmethodID postEventFromNative) {
37 // Hold onto the AudioTrack 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 == nullptr) {
41 return;
42 }
43 mClass = (jclass)env->NewGlobalRef(clazz);
44
45 // We use a weak reference so the AudioTrack 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 jclass byteBufferClass = FindClassOrDie(env, BYTE_BUFFER_NAME);
52 mByteBufferClass = (jclass)env->NewGlobalRef(byteBufferClass);
53 mAllocateDirectMethod =
54 GetStaticMethodIDOrDie(env, mByteBufferClass, BYTE_BUFFER_ALLOCATE_DIRECT_NAME,
55 "(I)Ljava/nio/ByteBuffer;");
56 }
57
~JNIAudioTrackCallback()58 JNIAudioTrackCallback::~JNIAudioTrackCallback() {
59 // remove global references
60 JNIEnv* env = AndroidRuntime::getJNIEnv();
61 if (env == nullptr) {
62 return;
63 }
64 env->DeleteGlobalRef(mObject);
65 env->DeleteGlobalRef(mClass);
66 env->DeleteGlobalRef(mByteBufferClass);
67 }
68
onCodecFormatChanged(const std::vector<uint8_t> & audioMetadata)69 binder::Status JNIAudioTrackCallback::onCodecFormatChanged(
70 const std::vector<uint8_t>& audioMetadata) {
71 JNIEnv* env = AndroidRuntime::getJNIEnv();
72 if (env == nullptr) {
73 return binder::Status::ok();
74 }
75
76 jobject byteBuffer = env->CallStaticObjectMethod(mByteBufferClass, mAllocateDirectMethod,
77 (jint)audioMetadata.size());
78 if (env->ExceptionCheck()) {
79 ALOGW("An exception occurred while allocating direct buffer");
80 env->ExceptionDescribe();
81 env->ExceptionClear();
82 }
83 if (byteBuffer == nullptr) {
84 ALOGE("Failed allocating a direct ByteBuffer");
85 return binder::Status::fromStatusT(NO_MEMORY);
86 }
87
88 uint8_t* byteBufferAddr = (uint8_t*)env->GetDirectBufferAddress(byteBuffer);
89 std::copy(audioMetadata.begin(), audioMetadata.end(), byteBufferAddr);
90 env->CallStaticVoidMethod(mClass, mPostEventFromNative, mObject,
91 AUDIO_NATIVE_EVENT_CODEC_FORMAT_CHANGE, 0, 0, byteBuffer);
92 if (env->ExceptionCheck()) {
93 ALOGW("An exception occurred while notifying codec format changed.");
94 env->ExceptionDescribe();
95 env->ExceptionClear();
96 }
97
98 return binder::Status::ok();
99 }
100