android - Android 一个 NDK 方法存在重入问题

Question

这是我的 NDK 方法：

 void FrameReceived(int width, int height, const char *rawImageBytes, int size, jboolean remote)
{
//LOGE(".... **** ....FrameReceived Begin = %d", size);

if(size == 0)
    return;

jboolean isAttached;
JNIEnv *env;
jint jParticipant;
jint jWidth;
jint jHeight;
jbyteArray jRawImageBytes;

env = getJniEnv(&isAttached);

if (env == NULL)
    goto FAIL0;
//LOGE(".... **** ....TRYING TO FIND CALLBACK");
LOGI("FrameReceived will reach here 1");
char *modifiedRawImageBytes = malloc(size);
memcpy(modifiedRawImageBytes, rawImageBytes, size);
jint sizeWH = width * height;
jint quarter = sizeWH/4;
jint v0 = sizeWH + quarter;
for (int u = sizeWH, v = v0, o = sizeWH; u < v0; u++, v++, o += 2) {
        modifiedRawImageBytes[o] = rawImageBytes[v]; // For NV21, V first
        modifiedRawImageBytes[o + 1] = rawImageBytes[u]; // For NV21, U second
}

if(remote)
{
    if(frameReceivedRemoteMethod == NULL)
        frameReceivedRemoteMethod = getApplicationJniMethodId(env, applicationJniObj, "vidyoConferenceFrameReceivedRemoteCallback", "(III[B)V");

    if (frameReceivedRemoteMethod == NULL) {
        //LOGE(".... **** ....CALLBACK NOT FOUND");
        goto FAIL1;
    }
}
else
{
    if(frameReceivedMethod == NULL)
        frameReceivedMethod = getApplicationJniMethodId(env, applicationJniObj, "vidyoConferenceFrameReceivedCallback", "(III[B)V");

    if (frameReceivedMethod == NULL) {
        //LOGE(".... **** ....CALLBACK NOT FOUND");
        goto FAIL1;
    }
}

jWidth = width;
jHeight = height;

jRawImageBytes = (*env)->NewByteArray(env, size);
(*env)->SetByteArrayRegion(env, jRawImageBytes, 0, size, modifiedRawImageBytes);

//LOGE(".... **** ....CALLBACK BEING CALLED");
if(remote)
{
    (*env)->CallVoidMethod(env, applicationJniObj, frameReceivedRemoteMethod, 0, jWidth, jHeight, jRawImageBytes);
}
else
{
    (*env)->CallVoidMethod(env, applicationJniObj, frameReceivedMethod, 0, jWidth, jHeight, jRawImageBytes);
}
//LOGE(".... **** ....CALLBACK CALLED");

(*env)->DeleteLocalRef(env, jRawImageBytes);
free(modifiedRawImageBytes);

if (isAttached)
{
    (*global_vm)->DetachCurrentThread(global_vm);
}
//LOGE("FrameReceived End");
return;
FAIL1:
if (isAttached)
{
    (*global_vm)->DetachCurrentThread(global_vm);
}
FAIL0:
//LOGE("FrameReceived FAILED");
return;
}

根据 jboolean 远程调用这 2 个函数中的 1 个：

 public void vidyoConferenceFrameReceivedCallback(final int participantId, final int width, final int height, final byte[] rawImageBytes) {
    if (selfView == null || selfView.getVisibility() == View.GONE)
        return;
    try {
        selfBitmap = Nv21Image.nv21ToBitmap(rs, rawImageBytes, width, height);
        new Handler(Looper.getMainLooper()).post(new Runnable() {
            @Override
            public void run() {
                selfView.setImageBitmap(selfBitmap);
            }
        });
    } catch (Exception e) {
        Logger.error("Error on vidyoConferenceFrameReceivedCallback: " + e.getMessage());
    }
}

和这个：

public void vidyoConferenceFrameReceivedRemoteCallback(final int participantId, final int width, final int height, final byte[] rawImageBytes) {
    if (remoteView == null || remoteView.getVisibility() == View.GONE)
        return;
    try {
        remoteResolution = width + "x" + height;
        remoteBitmap = Nv21Image.nv21ToBitmap(rs, rawImageBytes, width, height);
        new Handler(Looper.getMainLooper()).post(new Runnable() {
            @Override
            public void run() {
                remoteView.setImageBitmap(remoteBitmap);
            }
        });
    } catch (Exception e) {
        Logger.error("Error on vidyoConferenceFrameReceivedRemoteCallback: " + e.getMessage());
    }
}

如您所见，这两个函数看起来相同，只是图像视图和我保存数据的位图不同。但如果我分析我的应用程序。

第一种方法调用时，它的线程如下所示： https ://s3.amazonaws.com/uploads.hipchat.com/39260/829560/A3lm3QTz4gZN0VK/upload.png 它的平均时间是 4 秒，持续 15 秒分析。

但是第二种方法，远程方法，这样做： https ://s3.amazonaws.com/uploads.hipchat.com/39260/829560/wHp7NtKgKYTTEG7/upload.png 时间是 15 秒中的 15 秒。

在这里你可以清楚地看到，它以某种方式被冗余召回： https ://s3.amazonaws.com/uploads.hipchat.com/39260/829560/wCmS5CH21zbyMBr/upload.png

为什么会这样？

编辑：

我修改了远程功能来简单地做到这一点：

public void vidyoConferenceFrameReceivedRemoteCallback(final int participantId, final int width, final int height, final byte[] rawImageBytes) {
    Log.i("", "vidyoConferenceFrameReceivedRemoteCallback RECEIVED FRAME ");
}

通过分析该线程，我得到了这个： https ://s3.amazonaws.com/uploads.hipchat.com/39260/829560/ZfylnBheyA6GjTe/upload.png

我认为 NDK 中的某些内容导致该函数以某种方式被多次调用

标签： androidoptimizationandroid-ndkredundancyreentrancy