Add 4k HW decode override flag and support larger bitstream buffers in V4L2VDA.

media/base/media_switches.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/base/media_switches.h"
 
 namespace switches {
 
 // Allow users to specify a custom buffer size for debugging purpose.
 const char kAudioBufferSize[] = "audio-buffer-size";
 
 // Set number of threads to use for video decoding.
 const char kVideoThreads[] = "video-threads";
 
 // Enables ADTS stream parser for Media Source Extensions.
 const char kEnableADTSStreamParser[] = "enable-adts-stream-parser";
 
+// Force hardware decode of 4k video even if we were not able to detect
+// this capability.
+const char kForce4kAcceleratedVideoDecode[] =

[Ami GONE FROM CHROMIUM, 2014/05/15 16:00:42]

kAssume4kHWVideoDecodeIsSupported
is closer to what this is.
But really there's nothing in the code that is 4k-specific.

kIgnoreSizeLimitsForAcceleratedVideoDecode is closer to reality.

[Pawel Osciak, 2014/05/16 03:53:01]

I'd prefer s/Size/Resolution/. This will probably become the longest flag name
in Chrome.

[Ami GONE FROM CHROMIUM, 2014/05/16 16:49:59]

\grumpycat{good}
(it's not like this is a flag that should be set by anything _other_ than
/sbin/session_manager_setup.sh or whatever that file is called, right?)

+    "force-4k-accelerated-video-decode";
+
 #if defined(OS_ANDROID)
 // Disables the infobar popup for accessing protected media identifier.
 const char kDisableInfobarForProtectedMediaIdentifier[] =
     "disable-infobar-for-protected-media-identifier";
 
 // Enables use of non-compositing MediaDrm decoding by default for Encrypted
 // Media Extensions implementation.
 const char kMediaDrmEnableNonCompositing[] = "mediadrm-enable-non-compositing";
 #endif
 
@@ skipping 58 matching lines @@
 const char kUseCras[] = "use-cras";
 #endif
 
 // Use fake device for Media Stream to replace actual camera and microphone.
 const char kUseFakeDeviceForMediaStream[] = "use-fake-device-for-media-stream";
 
 // Use a raw video file as fake video capture device.
 const char kUseFileForFakeVideoCapture[] = "use-file-for-fake-video-capture";
 
 }  // namespace switches