OpenSL的代码编写

#include <jni.h>
#include <string>
#include <SLES/OpenSLES.h>
#include <SLES/OpenSLES_Android.h>


//1 创建引擎
static SLObjectItf  engineSL = NULL;
SLEngineItf CreateSL()
{
    SLresult re;
    SLEngineItf en;
    re = slCreateEngine(&engineSL,0,0,0,0,0);
    if(re != SL_RESULT_SUCCESS) return NULL;
    re = (*engineSL)->Realize(engineSL,SL_BOOLEAN_FALSE);
    if(re != SL_RESULT_SUCCESS) return NULL;
    re = (*engineSL)->GetInterface(engineSL,SL_IID_ENGINE,&en);
    if(re != SL_RESULT_SUCCESS) return NULL;
    return en;
}

void PcmCall(SLAndroidSimpleBufferQueueItf bf,void *contex)
{
    LOGD("PcmCall");
    static FILE *fp = NULL;
    static char *buf = NULL;
    if(!buf)
    {
        buf = new char[1024*1024];
    }
    if(!fp)
    {
        fp = fopen("/sdcard/shape.pcm","rb");
    }
    if(!fp)return;
    if(feof(fp) == 0)
    {
        int len = fread(buf,1,1024,fp);
        if(len > 0)
            (*bf)->Enqueue(bf,buf,len);
    }



}

extern "C"
JNIEXPORT jstring

JNICALL
Java_com_example_user_player_Play_stringFromJNI(
        JNIEnv *env,
        jobject /* this */) {
    std::string hello = "Hello from C++";

    //1 创建引擎
    SLEngineItf eng = CreateSL();
    if(eng){
        LOGD("CreateSL success！ ");
    }else{
        LOGD("CreateSL failed！ ");
    }

    //2 创建混音器
    SLObjectItf mix = NULL;
    SLresult re = 0;
    re = (*eng)->CreateOutputMix(eng,&mix,0,0,0);
    if(re !=SL_RESULT_SUCCESS )
    {
        LOGD("SL_RESULT_SUCCESS failed!");
    }
    re = (*mix)->Realize(mix,SL_BOOLEAN_FALSE);
    if(re !=SL_RESULT_SUCCESS )
    {
        LOGD("(*mix)->Realize failed!");
    }
    SLDataLocator_OutputMix outmix = {SL_DATALOCATOR_OUTPUTMIX,mix};
    SLDataSink audioSink= {&outmix,0};

    //3 配置音频信息
    //缓冲队列
    SLDataLocator_AndroidSimpleBufferQueue que = {SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE,10};
    //音频格式
    SLDataFormat_PCM pcm = {
            SL_DATAFORMAT_PCM,
            2,//    声道数
            SL_SAMPLINGRATE_44_1,
            SL_PCMSAMPLEFORMAT_FIXED_16,
            SL_PCMSAMPLEFORMAT_FIXED_16,
            SL_SPEAKER_FRONT_LEFT|SL_SPEAKER_FRONT_RIGHT,
            SL_BYTEORDER_LITTLEENDIAN //字节序，小端
    };
    SLDataSource ds = {&que,&pcm};


    //4 创建播放器
    SLObjectItf player = NULL;
    SLPlayItf iplayer = NULL;
    SLAndroidSimpleBufferQueueItf pcmQue = NULL;
    const SLInterfaceID ids[] = {SL_IID_BUFFERQUEUE};
    const SLboolean req[] = {SL_BOOLEAN_TRUE};
    re = (*eng)->CreateAudioPlayer(eng,&player,&ds,&audioSink,sizeof(ids)/sizeof(SLInterfaceID),ids,req);
    if(re !=SL_RESULT_SUCCESS )
    {
        LOGD("CreateAudioPlayer failed!");
    } else{
        LOGD("CreateAudioPlayer success!");
    }
    (*player)->Realize(player,SL_BOOLEAN_FALSE);
    //获取player接口
    re = (*player)->GetInterface(player,SL_IID_PLAY,&iplayer);
    if(re !=SL_RESULT_SUCCESS )
    {
        LOGD("GetInterface SL_IID_PLAY failed!");
    }
    re = (*player)->GetInterface(player,SL_IID_BUFFERQUEUE,&pcmQue);
    if(re !=SL_RESULT_SUCCESS )
    {
        LOGD("GetInterface SL_IID_BUFFERQUEUE failed!");
    }

    //设置回调函数，播放队列空调用
    (*pcmQue)->RegisterCallback(pcmQue,PcmCall,0);

    //设置为播放状态
    (*iplayer)->SetPlayState(iplayer,SL_PLAYSTATE_PLAYING);

    //启动队列回调
    (*pcmQue)->Enqueue(pcmQue,"",1);




错误的代码：

//1.创建引擎
SLEngineItf eng = CreateSL();


//2.创建输出设备
SLObjectItf mix = NULL;
(*eng)->CreateOutputMix(eng , &mix ,0 ,0 ,0);
//实例化mix
(*mix)->Realize(mix , SL_BOOLEAN_FALSE);
//配置输出设备
SLDataLocator_OutputMix outMix = {SL_DATALOCATOR_OUTPUTMIX , mix};
SLDataSink audioSink = {&outMix , 0};
//配置PCM格式信息
//缓冲格式
SLDataLocator_AndroidSimpleBufferQueue queue = {SL_DATALOCATOR_ANDROIDSIMPLEBUFFERQUEUE
        , 10};
//音频格式
SLDataFormat_PCM pcm = {
        SL_DATAFORMAT_PCM,
        2,
        SL_SAMPLINGRATE_44_1,
        SL_PCMSAMPLEFORMAT_FIXED_16,
        SL_PCMSAMPLEFORMAT_FIXED_16,
        SL_SPEAKER_FRONT_RIGHT | SL_SPEAKER_FRONT_LEFT,  //SL_SPEAKER_BACK_RIGHT,
        SL_BYTEORDER_LITTLEENDIAN    //字节序,小断------还有大段

};

SLDataSource ds = {&queue , &pcm};



//创建播放器
SLObjectItf player = NULL;
SLPlayItf iplayer = NULL ;
const SLInterfaceID  ids[] = {SL_IID_BUFFERQUEUE};
const SLboolean  req[] = {SL_BOOLEAN_TRUE};
(*eng)->CreateAudioPlayer(eng,&player,&ds,&audioSink,sizeof(ids)/sizeof(SLInterfaceID),ids,req); //如果只用player接口就不用传其他
//实例化播放器                                                       //参数，因为调用到内部类的接口，
(*player)->Realize(player ,SL_BOOLEAN_FALSE);                      //所以必须传入其他参数
//获取接口
(*player)->GetInterface(player, SL_IID_PLAY, &iplayer);


//获取队列的接口
SLAndroidSimpleBufferQueueItf pcmQue = NULL;
(*player)->GetInterface(player, SL_IID_BUFFERQUEUE, &pcmQue);

//设置回调函数
(*pcmQue)->RegisterCallback(pcmQue, PcmCall, 0);

//设置播放状态
(*iplayer)->SetPlayState(iplayer , SL_PLAYSTATE_PLAYING);

//启动队列回调
(*pcmQue)->Enqueue(pcmQue , " ",1);