1 /*
2 * Copyright 2018 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 #include <jni.h>
18 #include <string>
19 #include <vector>
20
21 #include "MegaDroneEngine.h"
22
23
convertJavaArrayToVector(JNIEnv * env,jintArray intArray)24 std::vector<int> convertJavaArrayToVector(JNIEnv *env, jintArray intArray) {
25 std::vector<int> v;
26 jsize length = env->GetArrayLength(intArray);
27 if (length > 0) {
28 jint *elements = env->GetIntArrayElements(intArray, nullptr);
29 v.insert(v.end(), &elements[0], &elements[length]);
30 // Unpin the memory for the array, or free the copy.
31 env->ReleaseIntArrayElements(intArray, elements, 0);
32 }
33 return v;
34 }
35
36 extern "C" {
37 /**
38 * Start the audio engine
39 *
40 * @param env
41 * @param instance
42 * @param jCpuIds - CPU core IDs which the audio process should affine to
43 * @return a pointer to the audio engine. This should be passed to other methods
44 */
45 JNIEXPORT jlong JNICALL
Java_com_google_oboe_samples_megadrone_MainActivity_startEngine(JNIEnv * env,jobject,jintArray jCpuIds)46 Java_com_google_oboe_samples_megadrone_MainActivity_startEngine(JNIEnv *env, jobject /*unused*/,
47 jintArray jCpuIds) {
48 std::vector<int> cpuIds = convertJavaArrayToVector(env, jCpuIds);
49 LOGD("cpu ids size: %d", static_cast<int>(cpuIds.size()));
50 MegaDroneEngine *engine = new MegaDroneEngine(std::move(cpuIds));
51
52 if (!engine->start()) {
53 LOGE("Failed to start MegaDrone Engine");
54 delete engine;
55 engine = nullptr;
56 } else {
57 LOGD("Engine Started");
58 }
59 return reinterpret_cast<jlong>(engine);
60 }
61
62 JNIEXPORT void JNICALL
Java_com_google_oboe_samples_megadrone_MainActivity_stopEngine(JNIEnv * env,jobject instance,jlong jEngineHandle)63 Java_com_google_oboe_samples_megadrone_MainActivity_stopEngine(JNIEnv *env, jobject instance,
64 jlong jEngineHandle) {
65 auto engine = reinterpret_cast<MegaDroneEngine*>(jEngineHandle);
66 if (engine) {
67 engine->stop();
68 delete engine;
69 } else {
70 LOGD("Engine invalid, call startEngine() to create");
71 }
72 }
73
74
75 JNIEXPORT void JNICALL
Java_com_google_oboe_samples_megadrone_MainActivity_tap(JNIEnv * env,jobject instance,jlong jEngineHandle,jboolean isDown)76 Java_com_google_oboe_samples_megadrone_MainActivity_tap(JNIEnv *env, jobject instance,
77 jlong jEngineHandle, jboolean isDown) {
78
79 auto *engine = reinterpret_cast<MegaDroneEngine*>(jEngineHandle);
80 if (engine) {
81 engine->tap(isDown);
82 } else {
83 LOGE("Engine handle is invalid, call createEngine() to create a new one");
84 }
85 }
86
87 JNIEXPORT void JNICALL
Java_com_google_oboe_samples_megadrone_MainActivity_native_1setDefaultStreamValues(JNIEnv * env,jclass type,jint sampleRate,jint framesPerBurst)88 Java_com_google_oboe_samples_megadrone_MainActivity_native_1setDefaultStreamValues(JNIEnv *env,
89 jclass type,
90 jint sampleRate,
91 jint framesPerBurst) {
92 oboe::DefaultStreamValues::SampleRate = (int32_t) sampleRate;
93 oboe::DefaultStreamValues::FramesPerBurst = (int32_t) framesPerBurst;
94 }
95
96 } // extern "C"
97