OpenSL ES RegisterCallback导致崩溃

Question

我的项目必须使用OpenSL（尝试过Soundpool，但一点都不好）。然而，在多次播放声音（大约连续35次）后，应用程序关闭（我想可能是因为溢出）。

我试图释放缓冲区/内存来解决这个问题（看在上帝的份上，我不知道如何使用这个OpenSL）。所以我决定在文件播放完毕后尝试释放。OpenSL ES为我们提供了RegisterCallback功能，这可能会有所帮助。出现了新问题，在我的情况下（使用URI文件），RegisterCallback导致我的应用程序再次崩溃。它卡住了。

这是我的密码。请帮忙。它在//register callback for uri之后坠毁。

static short fdBuffer[SAWTOOTH_FRAMES];
// create URI audio player
    jboolean Java_jp_mobigame_ayakashi_CardGameActivity_createUriAudioPlayer(JNIEnv* env, jclass clazz,
            jstring uri)
    {
        __android_log_print(ANDROID_LOG_DEBUG, "LOG_TAG", "n createUri n");
        SLresult result;
        // convert Java string to UTF-8
        const jbyte *utf8 = (*env)->GetStringUTFChars(env, uri, NULL);
        assert(NULL != utf8);
        // configure audio source
        // (requires the INTERNET permission depending on the uri parameter)
        SLDataLocator_URI loc_uri = {SL_DATALOCATOR_URI, (SLchar *) utf8};
        SLDataFormat_MIME format_mime = {SL_DATAFORMAT_MIME, NULL, SL_CONTAINERTYPE_UNSPECIFIED};
        SLDataSource audioSrc = {&loc_uri, &format_mime};
        // configure audio sink
        SLDataLocator_OutputMix loc_outmix = {SL_DATALOCATOR_OUTPUTMIX, outputMixObject};
        SLDataSink audioSnk = {&loc_outmix, NULL};
        // create audio player
        const SLInterfaceID ids[3] = {SL_IID_SEEK, SL_IID_MUTESOLO /*SL_IID_BUFFERQUEUE*/, SL_IID_VOLUME};
        const SLboolean req[3] = {SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE, SL_BOOLEAN_TRUE};
        result = (*engineEngine)->CreateAudioPlayer(engineEngine, &uriPlayerObject, &audioSrc,
                &audioSnk, 3, ids, req);
        // note that an invalid URI is not detected here, but during prepare/prefetch on Android,
        // or possibly during Realize on other platforms
        assert(SL_RESULT_SUCCESS == result);
        // release the Java string and UTF-8
        (*env)->ReleaseStringUTFChars(env, uri, utf8);
        // realize the player
        result = (*uriPlayerObject)->Realize(uriPlayerObject, SL_BOOLEAN_FALSE);
        // this will always succeed on Android, but we check result for portability to other platforms
        if (SL_RESULT_SUCCESS != result) {
            (*uriPlayerObject)->Destroy(uriPlayerObject);
            uriPlayerObject = NULL;
            return JNI_FALSE;
        }
        // get the play interface
        result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_PLAY, &uriPlayerPlay);
        assert(SL_RESULT_SUCCESS == result);
        // get the seek interface
        result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_SEEK, &uriPlayerSeek);
        assert(SL_RESULT_SUCCESS == result);

        __android_log_print(ANDROID_LOG_DEBUG, "LOG_TAG", "n createUri 1n");
        //get the buffer queue interface
        result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_ANDROIDSIMPLEBUFFERQUEUE, &uriPlayerBufferQueue);
        assert(SL_RESULT_SUCCESS == result);
        __android_log_print(ANDROID_LOG_DEBUG, "LOG_TAG", "n createUri 2n");

        //register callback for uri
        result = (*uriPlayerBufferQueue)->RegisterCallback(uriPlayerBufferQueue, bqUriPlayerCallback, NULL);
        assert(SL_RESULT_SUCCESS == result);
        __android_log_print(ANDROID_LOG_DEBUG, "LOG_TAG", "n createUri 4n");
        //Enqueue
        __android_log_print(ANDROID_LOG_DEBUG, "LOG_TAG", "n createUri 3n");
        result = (*uriPlayerBufferQueue)->Enqueue(uriPlayerBufferQueue, fdBuffer, sizeof(fdBuffer));

        // get the mute/solo interface
        result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_MUTESOLO, &uriPlayerMuteSolo);
        assert(SL_RESULT_SUCCESS == result);
        // get the volume interface
        result = (*uriPlayerObject)->GetInterface(uriPlayerObject, SL_IID_VOLUME, &uriPlayerVolume);
        assert(SL_RESULT_SUCCESS == result);
        return JNI_TRUE;
    }

Answer 1

尽管您指定了一个uri源，但您似乎正在尝试获得一个缓冲队列接口。您似乎也在查询数据。如果你只是想播放来自uri的音频，你不需要这样做。如果您试图输出到缓冲区而不是扬声器，那么这可能是有效的。无论如何，我都不是OpenSL专家，所以这可能是有原因的。但是，如果没有原因，请尝试在播放器对象上注册回调。

(*uriPlayerPlay)->RegisterCallback(uriPlayerPlay, bqUriPlayerCallback, NULL);

附带说明一下，您可能需要设置回调事件掩码。有几种选择，但我相信你正在寻找的是：

(*uriPlayerPlay)->SetCallbackEventsMask(uriPlayerPlay, SL_PLAYEVENT_HEADATEND)

请注意，这可能存在问题。看见https://groups.google.com/forum/?fromgroups=#！主题/android ndk/7YaqlKlDMO4.

如果这没有帮助，那么查看回调函数的定义可能会有所帮助。我认为它应该看起来像：

static void bqUriPlayerCallback (SLPlayItf caller, void *pContext, SLuint32 playevent)