C++ JNICameraContext类代码示例

// disconnect from camera service
// It's okay to call this when the native camera context is already null.
// This handles the case where the user has called release() and the
// finalizer is invoked later.
static void android_hardware_Camera_release(JNIEnv *env, jobject thiz)
{
    // TODO: Change to LOGV
    LOGV("release camera");
    JNICameraContext* context = NULL;
    sp<Camera> camera;
    {
        Mutex::Autolock _l(sLock);
        context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));

        // Make sure we do not attempt to callback on a deleted Java object.
        env->SetIntField(thiz, fields.context, 0);
    }

    // clean up if release has not been called before
    if (context != NULL) {
        camera = context->getCamera();
        context->release();
        LOGV("native_release: context=%p camera=%p", context, camera.get());

        // clear callbacks
        if (camera != NULL) {
            camera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
            camera->disconnect();
        }

        // remove context to prevent further Java access
        context->decStrong(thiz);
    }
}

static void android_hardware_Camera_takePicture(JNIEnv *env, jobject thiz, int msgType)
{
    LOGV("takePicture");
    JNICameraContext* context;
    sp<Camera> camera = get_native_camera(env, thiz, &context);
    if (camera == 0) return;

    /*
     * When CAMERA_MSG_RAW_IMAGE is requested, if the raw image callback
     * buffer is available, CAMERA_MSG_RAW_IMAGE is enabled to get the
     * notification _and_ the data; otherwise, CAMERA_MSG_RAW_IMAGE_NOTIFY
     * is enabled to receive the callback notification but no data.
     *
     * Note that CAMERA_MSG_RAW_IMAGE_NOTIFY is not exposed to the
     * Java application.
     */
    if (msgType & CAMERA_MSG_RAW_IMAGE) {
        LOGV("Enable raw image callback buffer");
        if (!context->isRawImageCallbackBufferAvailable()) {
            LOGV("Enable raw image notification, since no callback buffer exists");
            msgType &= ~CAMERA_MSG_RAW_IMAGE;
            msgType |= CAMERA_MSG_RAW_IMAGE_NOTIFY;
        }
    }

    if (camera->takePicture(msgType) != NO_ERROR) {
        jniThrowRuntimeException(env, "takePicture failed");
        return;
    }
}

static void android_hardware_Camera_addCallbackBuffer(JNIEnv *env, jobject thiz, jbyteArray bytes, int msgType) {
    LOGV("addCallbackBuffer: 0x%x", msgType);

    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));

    if (context != NULL) {
        context->addCallbackBuffer(env, bytes, msgType);
    }
}

// disconnect from camera service
// It's okay to call this when the native camera context is already null.
// This handles the case where the user has called release() and the
// finalizer is invoked later.
static void android_hardware_Camera_release(JNIEnv *env, jobject thiz)
{
    // TODO: Change to ALOGV
    ALOGV("release camera");
    JNICameraContext* context = NULL;
    sp<Camera> camera;
    {
        Mutex::Autolock _l(sLock);
        context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));

        // Make sure we do not attempt to callback on a deleted Java object.
        env->SetIntField(thiz, fields.context, 0);
    }

    // clean up if release has not been called before
    if (context != NULL) {
        camera = context->getCamera();
        context->release();
        ALOGV("native_release: context=%p camera=%p", context, camera.get());

//!++
//#ifdef  MTK_CAMERA_BSP_SUPPORT
#if 1
        ALOGD("(tid:%d)[native_release] + context=%p camera=%p \n", ::gettid(), context, camera.get());
        // clear callbacks
        if (camera != NULL) {
            ALOGD("[native_release] context->getStrongCount(%d) camera->getStrongCount(%d) \n", context->getStrongCount(), camera->getStrongCount());
            camera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
            camera->disconnect();
            camera = NULL;
        }
        ALOGD("(tid:%d)[native_release] - context=%p camera=%p \n", ::gettid(), context, camera.get());
#else
        // clear callbacks
        if (camera != NULL) {
            camera->setPreviewCallbackFlags(CAMERA_FRAME_CALLBACK_FLAG_NOOP);
            camera->disconnect();
        }
#endif  //MTK_CAMERA_BSP_SUPPORT
//!--

        // remove context to prevent further Java access
        context->decStrong((void*)android_hardware_Camera_native_setup);
    }

//!++
//#ifdef  MTK_CAMERA_BSP_SUPPORT
    ALOGD("(tid:%d)[release camera] - X context=%p \n", ::gettid(), context);
//#endif
//!--
}

static void android_hardware_Camera_setHasPreviewCallback(JNIEnv *env, jobject thiz, jboolean installed, jboolean manualBuffer)
{
    LOGV("setHasPreviewCallback: installed:%d, manualBuffer:%d", (int)installed, (int)manualBuffer);
    // Important: Only install preview_callback if the Java code has called
    // setPreviewCallback() with a non-null value, otherwise we'd pay to memcpy
    // each preview frame for nothing.
    JNICameraContext* context;
    sp<Camera> camera = get_native_camera(env, thiz, &context);
    if (camera == 0) return;

    // setCallbackMode will take care of setting the context flags and calling
    // camera->setPreviewCallbackFlags within a mutex for us.
    context->setCallbackMode(env, installed, manualBuffer);
}

sp<Camera> get_native_camera(JNIEnv *env, jobject thiz, JNICameraContext** pContext)
{
    sp<Camera> camera;
    Mutex::Autolock _l(sLock);
    JNICameraContext* context = reinterpret_cast<JNICameraContext*>(env->GetIntField(thiz, fields.context));
    if (context != NULL) {
        camera = context->getCamera();
    }
    LOGV("get_native_camera: context=%p, camera=%p", context, camera.get());
    if (camera == 0) {
        jniThrowRuntimeException(env, "Method called after release()");
    }

    if (pContext != NULL) *pContext = context;
    return camera;
}

static void android_hardware_Camera_setPreviewCallbackSurface(JNIEnv *env,
        jobject thiz, jobject jSurface)
{
    ALOGV("setPreviewCallbackSurface");
    JNICameraContext* context;
    sp<Camera> camera = get_native_camera(env, thiz, &context);
    if (camera == 0) return;

    sp<IGraphicBufferProducer> gbp;
    sp<Surface> surface;
    if (jSurface) {
        surface = android_view_Surface_getSurface(env, jSurface);
        if (surface != NULL) {
            gbp = surface->getIGraphicBufferProducer();
        }
    }
    // Clear out normal preview callbacks
    context->setCallbackMode(env, false, false);
    // Then set up callback surface
    if (camera->setPreviewCallbackTarget(gbp) != NO_ERROR) {
        jniThrowException(env, "java/io/IOException", "setPreviewCallbackTarget failed");
    }
}