Android OpenSL播放PCM数据记录

最新推荐文章于 2024-07-08 03:09:07 发布

try_zp_catch

最新推荐文章于 2024-07-08 03:09:07 发布

阅读量149

点赞数

本文链接：https://blog.youkuaiyun.com/try_zp_catch/article/details/119423432

版权

这篇博客详细介绍了如何使用OpenSL ES在Android平台上创建音频引擎、混音器和播放器，以及配置音频信息和播放队列。通过示例代码展示了如何实现从PCM文件读取音频数据并进行播放的操作，同时也涉及到文件操作和回调函数的设置。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

赶紧记录一下不然又找不到了：

//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) {
    LOGE("PcmCall");
    static FILE *fp = NULL;
    static char *buf = NULL;
    if (!buf) {
        buf = new char[1024 * 1024];
    }
    if (!fp) {
        fp = fopen("/sdcard/audio.pcm", "rb");
    }else{
        LOGE("open file failed ! %s",fp);
    }
    if (!fp)return;
    if (feof(fp) == 0) {
        int len = fread(buf, 1, 1024, fp);
        if (len > 0)
            (*bf)->Enqueue(bf, buf, len);
    }
}
PlayAudio(JNIEnv *env, jobject thiz, jstring paths_) {
    const char *paths = env->GetStringUTFChars(paths_, 0);
//    LOGE("path:%s",path);
    const char *out = "/sdcard/zhou.pcm";

    //1 创建引擎
    SLEngineItf eng = CreateSL();
    if (eng) {
        LOGE("CreateSL success！ ");
    } else {
        LOGE("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) {
        LOGE("SL_RESULT_SUCCESS failed!");
    }
    re = (*mix)->Realize(mix, SL_BOOLEAN_FALSE);
    if (re != SL_RESULT_SUCCESS) {
        LOGE("(*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) {
        LOGE("CreateAudioPlayer failed!");
    } else {
        LOGE("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) {
        LOGE("GetInterface SL_IID_PLAY failed!");
    }
    re = (*player)->GetInterface(player, SL_IID_BUFFERQUEUE, &pcmQue);
    if (re != SL_RESULT_SUCCESS) {
        LOGE("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);


    env->ReleaseStringUTFChars(paths_, paths);
}

找不到原文了，好多都是抄的，我在夏老师视频学的。侵删！