16 bpp video stream capture, render and createImageBitmap(video) using (CPU) shared memory buffers

media/capture/video/fake_video_capture_device_factory.cc

Index: media/capture/video/fake_video_capture_device_factory.cc
diff --git a/media/capture/video/fake_video_capture_device_factory.cc b/media/capture/video/fake_video_capture_device_factory.cc
index 38ef6054ecb237593f6ec916050fb036b80aa2b0..30c3d8bbc9ef02a04fbb488575273480f6a1da24 100644
--- a/media/capture/video/fake_video_capture_device_factory.cc
+++ b/media/capture/video/fake_video_capture_device_factory.cc
@@ -13,6 +13,16 @@
 #include "build/build_config.h"
 #include "media/base/media_switches.h"
 
+namespace {
+
+media::VideoPixelFormat get_pixelformat(const std::string& device_id) {
+  if (device_id == "/dev/video1")
+    return media::PIXEL_FORMAT_Y16;
+  return media::PIXEL_FORMAT_I420;
+}
+
+}
+
 namespace media {
 
 // Cap the frame rate command line input to reasonable values.
@@ -21,8 +31,9 @@ static const float kFakeCaptureMaxFrameRate = 60.0f;
 // Default rate if none is specified as part of the command line.
 static const float kFakeCaptureDefaultFrameRate = 20.0f;
 
+// Factory has two devices by default; I420 and Y16. See also get_pixelformat().
 FakeVideoCaptureDeviceFactory::FakeVideoCaptureDeviceFactory()
-    : number_of_devices_(1),
+    : number_of_devices_(2),
       fake_vcd_ownership_(FakeVideoCaptureDevice::BufferOwnership::OWN_BUFFERS),
       frame_rate_(kFakeCaptureDefaultFrameRate) {}
 
@@ -35,8 +46,8 @@ std::unique_ptr<VideoCaptureDevice> FakeVideoCaptureDeviceFactory::CreateDevice(
   for (int n = 0; n < number_of_devices_; ++n) {
     std::string possible_id = base::StringPrintf("/dev/video%d", n);
     if (device_descriptor.device_id.compare(possible_id) == 0) {
-      return std::unique_ptr<VideoCaptureDevice>(
-          new FakeVideoCaptureDevice(fake_vcd_ownership_, frame_rate_));
+      return std::unique_ptr<VideoCaptureDevice>(new FakeVideoCaptureDevice(
+          fake_vcd_ownership_, frame_rate_, get_pixelformat(possible_id)));
     }
   }
   return std::unique_ptr<VideoCaptureDevice>();
@@ -66,14 +77,15 @@ void FakeVideoCaptureDeviceFactory::GetSupportedFormats(
     const VideoCaptureDeviceDescriptor& device_descriptor,
     VideoCaptureFormats* supported_formats) {
   DCHECK(thread_checker_.CalledOnValidThread());
-  const gfx::Size supported_sizes[] = {gfx::Size(320, 240),
+  const gfx::Size supported_sizes[] = {gfx::Size(96, 96), // To test cubemap.
+                                       gfx::Size(320, 240),
                                        gfx::Size(640, 480),
                                        gfx::Size(1280, 720),
                                        gfx::Size(1920, 1080)};
   supported_formats->clear();
   for (const auto& size : supported_sizes) {
-    supported_formats->push_back(
-        VideoCaptureFormat(size, frame_rate_, media::PIXEL_FORMAT_I420));
+    supported_formats->push_back(VideoCaptureFormat(
+        size, frame_rate_, get_pixelformat(device_descriptor.device_id)));
   }
 }