HarmonyOS FFmpeg解码后的rgba数据绘制到Xcomponent有demo提供吗？

Question

FFmpeg解码后的rgba数据怎么绘制到Xcomponent上面有没有参考的demo？

使用了NativeImage：

void OhosSWDisplay::CopyToNativeImage(int width, int height, uint8_t *ragaBuffer) {
  if (nativeImage_ == nullptr) {
    return;
  }
  // 获取生产者NativeWindow
  OHNativeWindow *nativeWindow = OH_NativeImage_AcquireNativeWindow(nativeImage_);
  if (!nativeWindow) {
    ALOGE("OH_NativeImage_AcquireNativeWindow failed");
    return;
  }
  // 设置NativeWindow的宽高。
  int code = SET_BUFFER_GEOMETRY;
  int32_t ret = OH_NativeWindow_NativeWindowHandleOpt(nativeWindow, code, width, height);
  if (ret != 0) {
    ALOGE("OH_NativeWindow_NativeWindowHandleOpt failed");
    return;
  }

  // 从NativeWindow中获取NativeWindowBuffer。
  OHNativeWindowBuffer *buffer = nullptr;
  int fenceFd;
  // 通过 OH_NativeWindow_NativeWindowRequestBuffer 获取 OHNativeWindowBuffer 实例
  ret = OH_NativeWindow_NativeWindowRequestBuffer(nativeWindow, &buffer, &fenceFd);
  if (ret != 0) {
    ALOGE("OH_NativeWindow_NativeWindowRequestBuffer failed");
    return;
  }
  BufferHandle *handle = OH_NativeWindow_GetBufferHandleFromNative(buffer);
  if (!handle) {
    ALOGE("OH_NativeWindow_GetBufferHandleFromNative failed");
    return;
  }

  // 将生产的内容写入NativeWindowBuffer。
  // 使用系统mmap接口拿到bufferHandle的内存虚拟地址
  void *mappedAddr = mmap(handle->virAddr, handle->size, PROT_READ | PROT_WRITE, MAP_SHARED, handle->fd, 0);
  if (mappedAddr == MAP_FAILED) {
    ALOGE("mmap failed");
    return;
  }
  uint32_t *pixel = static_cast<uint32_t *>(mappedAddr);
  for (uint32_t x = 0; x < width; x++) {
    for (uint32_t y = 0; y < height; y++) {
      *pixel++ = *ragaBuffer++;
    }
  }
  // 内存使用完记得去掉内存映射
  int result = munmap(mappedAddr, handle->size);
  if (result == -1) {
    ALOGE("munmap failed");
  }

  // 将NativeWindowBuffer提交到NativeWindow。
  // 设置刷新区域，如果Region中的Rect为nullptr,或者rectNumber为0，则认为NativeWindowBuffer全部有内容更改。
  Region region{nullptr, 0};
  // 通过OH_NativeWindow_NativeWindowFlushBuffer 提交给消费者使用，例如：显示在屏幕上。
  OH_NativeWindow_NativeWindowFlushBuffer(nativeWindow, buffer, fenceFd, region);
  // 用完需要销毁NativeWindow。
  OH_NativeWindow_DestroyNativeWindow(nativeWindow);
}

但是在调用几次后OH\_NativeWindow\_NativeWindowRequestBuffer就是崩溃。

Reason:Signal:SIGSEGV(SEGV_MAPERR)@0x006b6b6b6b6b6b6b 

Answer 1

可以参考如下demo：https://gitee.com/openharmony/applications\_app\_samples/tree/master/code/BasicFeature/Native/NdkNativeWindow