在安卓系统上的c语言编译器如何实现声音播放程序使用举例?
时间: 2023-06-08 09:06:28 浏览: 203
在安卓系统上实现声音播放程序可以使用Android SDK和NDK结合编写C语言程序。具体步骤如下:
1.编写C语言程序,使用OpenSL ES完成音频的播放和控制。
2.使用Android NDK编译C语言程序,生成可执行文件。
3.将可执行文件导入到Android Studio项目的assets目录下。
4.在Java代码中调用JNI方法,实现C语言程序的调用。
5.使用Android SDK提供的MediaPlayer类实现音频播放。
举例来说,可以先编写一个简单的C语言程序,使用OpenSL ES库实现音频的播放和控制:
#include <SLES/OpenSLES.h>
#include <SLES/OpenSLES_Android.h>
#include <stdio.h>
// 创建OpenSL ES引擎对象
SLresult result;
SLObjectItf engineObject;
void createEngine() {
result = slCreateEngine(&engineObject, 0, NULL, 0, NULL, NULL);
result = (*engineObject)->Realize(engineObject, SL_BOOLEAN_FALSE);
result = (*engineObject)->GetInterface(engineObject, SL_IID_ENGINE, &engineEngine);
}
// 创建混音器对象
SLObjectItf mixObject;
SLEngineItf engineEngine;
void createMix() {
result = (*engineEngine)->CreateOutputMix(engineEngine, &mixObject, 0, NULL, NULL);
result = (*mixObject)->Realize(mixObject, SL_BOOLEAN_FALSE);
}
// 创建播放器对象
SLObjectItf playerObject;
SLPlayItf playInterface;
void createPlayer() {
// 配置音频数据格式
SLDataLocator_AndroidBufferQueue loc_bufq = { SL_DATALOCATOR_ANDROIDBUFFERQUEUE, 2 };
SLDataFormat_PCM format_pcm = { SL_DATAFORMAT_PCM, 2, SL_SAMPLINGRATE_44_1, SL_PCMSAMPLEFORMAT_FIXED_16, SL_PCMSAMPLEFORMAT_FIXED_16, SL_SPEAKER_FRONT_LEFT | SL_SPEAKER_FRONT_RIGHT, SL_BYTEORDER_LITTLE_ENDIAN };
SLDataSource audioSrc = { &loc_bufq, &format_pcm };
// 配置音频输出设备
SLDataLocator_OutputMix loc_outmix = { SL_DATALOCATOR_OUTPUTMIX, mixObject };
SLDataSink audioSnk = { &loc_outmix, NULL };
// 创建播放器
const SLInterfaceID ids[1] = { SL_IID_BUFFERQUEUE };
const SLboolean req[1] = { SL_BOOLEAN_TRUE };
result = (*engineEngine)->CreateAudioPlayer(engineEngine, &playerObject, &audioSrc, &audioSnk, 1, ids, req);
result = (*playerObject)->Realize(playerObject, SL_BOOLEAN_FALSE);
result = (*playerObject)->GetInterface(playerObject, SL_IID_PLAY, &playInterface);
}
// 播放声音
void playSound() {
// 创建AudioBufferQueue缓冲区
SLAndroidSimpleBufferQueueItf queueInterface;
result = (*playerObject)->GetInterface(playerObject, SL_IID_BUFFERQUEUE, &queueInterface);
const short audioData[] = { 32767, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
result = (*queueInterface)->Enqueue(queueInterface, audioData, sizeof(audioData));
result = (*playInterface)->SetPlayState(playInterface, SL_PLAYSTATE_PLAYING);
}
在Android Studio项目中,将C语言程序导入到assets目录下,然后编写Java代码调用JNI方法,实现C语言程序的调用和音频播放:
public class MainActivity extends AppCompatActivity {
// 声明JNI方法
static {
System.loadLibrary("native-lib");
}
private native void createEngine();
private native void createMix();
private native void createPlayer();
private native void playSound();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
createEngine();
createMix();
createPlayer();
playSound();
}
}
通过上述步骤,就可以在安卓系统上实现C语言编写的声音播放程序了。
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