media/gpu/V4L2VEA: Create ImageProcessor with multi-planar input layout

The input VideoFrame of ImageProcessor on V4L2VEA is the one given
by the VEA client. The input config of the ImageProcessor should
be multi-planar layout so that ImageProcessor can deal with
arbitrary offsets of the VideoFrame.

Bug: 1033799
Test: appr.tc on kukui
Change-Id: I43df37bb4c2dc9ab1221acd14d19d2413f2c4402
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2102938
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Alexandre Courbot <acourbot@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751223}

media/gpu/v4l2/v4l2_video_encode_accelerator.cc

@@ -117,6 +117,15 @@ base::Optional<ImageProcessor::PortConfig> VideoFrameLayoutToPortConfig(
                                     layout.planes(), visible_rect,
                                     preferred_storage_types);
 }
+
+// Create Layout from |layout| with is_multi_planar = true.
+base::Optional<VideoFrameLayout> AsMultiPlanarLayout(
+    const VideoFrameLayout& layout) {
+  if (layout.is_multi_planar())
+    return base::make_optional<VideoFrameLayout>(layout);
+  return VideoFrameLayout::CreateMultiPlanar(
+      layout.format(), layout.coded_size(), layout.planes());
+}
 }  // namespace
 
 struct V4L2VideoEncodeAccelerator::BitstreamBufferRef {
@@ -282,8 +291,6 @@ void V4L2VideoEncodeAccelerator::InitializeTask(const Config& config,
     VLOGF(2) << "Input format: " << config.input_format << " is not supported "
              << "by the HW. Will try to convert to "
              << device_input_layout_->format();
-
-    // TODO(hiroh): Decide the appropriate planar in some way.
     auto input_layout = VideoFrameLayout::CreateMultiPlanar(
         config.input_format, encoder_input_visible_rect_.size(),
         std::vector<ColorPlaneLayout>(
@@ -354,12 +361,15 @@ bool V4L2VideoEncodeAccelerator::CreateImageProcessor(
   DCHECK_CALLED_ON_VALID_SEQUENCE(encoder_sequence_checker_);
   DCHECK_NE(input_layout.format(), output_layout.format());
 
+  auto ip_input_layout = AsMultiPlanarLayout(std::move(input_layout));
+  if (!ip_input_layout)
+    return false;
+
   VideoFrame::StorageType input_storage_type =
       native_input_mode_ ? VideoFrame::STORAGE_GPU_MEMORY_BUFFER
                          : VideoFrame::STORAGE_MOJO_SHARED_BUFFER;
-
   auto input_config = VideoFrameLayoutToPortConfig(
-      input_layout, input_visible_rect, {input_storage_type});
+      *ip_input_layout, input_visible_rect, {input_storage_type});
   if (!input_config)
     return false;
   auto output_config =