content: Add support for Video Decode Acceleration on GBM

content/common/gpu/media/vaapi_wrapper.h

 // Copyright 2013 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.
 //
 // This file contains an implementation of VaapiWrapper, used by
 // VaapiVideoDecodeAccelerator and VaapiH264Decoder for decode,
 // and VaapiVideoEncodeAccelerator for encode, to interface
 // with libva (VA-API library for hardware video codec).
 
 #ifndef CONTENT_COMMON_GPU_MEDIA_VAAPI_WRAPPER_H_
 #define CONTENT_COMMON_GPU_MEDIA_VAAPI_WRAPPER_H_
 
 #include <set>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/synchronization/lock.h"
 #include "content/common/content_export.h"
 #include "content/common/gpu/media/va_surface.h"
 #include "media/base/video_decoder_config.h"
 #include "media/base/video_frame.h"
+#if defined(USE_X11)
 #include "third_party/libva/va/va_x11.h"
+#else
+#include "third_party/libva/va/drm/va_drm.h"
+#endif
 #include "ui/gfx/size.h"
 
 namespace content {
 
 // This class handles VA-API calls and ensures proper locking of VA-API calls
 // to libva, the userspace shim to the HW codec driver. libva is not
 // thread-safe, so we have to perform locking ourselves. This class is fully
 // synchronous and its methods can be called from any thread and may wait on
 // the va_lock_ while other, concurrent calls run.
 //
 // This class is responsible for managing VAAPI connection, contexts and state.
 // It is also responsible for managing and freeing VABuffers (not VASurfaces),
 // which are used to queue parameters and slice data to the HW codec,
 // as well as underlying memory for VASurfaces themselves.
 class CONTENT_EXPORT VaapiWrapper {
  public:
   enum CodecMode {
     kDecode,
     kEncode,
   };
 
   // |report_error_to_uma_cb| will be called independently from reporting
   // errors to clients via method return values.
   static scoped_ptr<VaapiWrapper> Create(
       CodecMode mode,
       media::VideoCodecProfile profile,
-      Display* x_display,
+#if defined(USE_X11)
+      Display* display,
+#else
+      int display,
+#endif
       const base::Closure& report_error_to_uma_cb);
 
   ~VaapiWrapper();
 
   // Create |num_surfaces| backing surfaces in driver for VASurfaces, each
   // of size |size|. Returns true when successful, with the created IDs in
   // |va_surfaces| to be managed and later wrapped in VASurfaces.
   // The client must DestroySurfaces() each time before calling this method
   // again to free the allocated surfaces first, but is not required to do so
   // at destruction time, as this will be done automatically from
@@ skipping 24 matching lines @@
                                   void* buffer);
 
   // Cancel and destroy all buffers queued to the HW codec via SubmitBuffer().
   // Useful when a pending job is to be cancelled (on reset or error).
   void DestroyPendingBuffers();
 
   // Execute job in hardware on target |va_surface_id| and destroy pending
   // buffers. Return false if Execute() fails.
   bool ExecuteAndDestroyPendingBuffers(VASurfaceID va_surface_id);
 
+#if defined(USE_X11)

[scherkus (not reviewing), 2014/07/29 17:48:55]

out of curiosity, is USE_X11 sticking around for vaapi, or is this more of a
transitional thing?

[vignatti (out of this project), 2014/07/30 21:51:30]

it's a good question that I don't know the answer. I just recently started to
deal with vaapi and meet the developers.

It's reasonable to think that X11 will be there while consumers exist for it. I
think we should at least give a feedback for the developers about our usage, say
try to have a common interface for the different backends etc. 

   // Put data from |va_surface_id| into |x_pixmap| of size |size|,
   // converting/scaling to it.
   bool PutSurfaceIntoPixmap(VASurfaceID va_surface_id,
                             Pixmap x_pixmap,
                             gfx::Size dest_size);
+#else
+  // Create RGB image of size |size|, assigning it to |image|.
+  bool CreateRGBImage(gfx::Size size, VAImage* image);
 
+  // Destroy |image|. Should call DestroyImage before destroying the surface it
+  // is bound to.
+  void DestroyImage(VAImage* image);
+
+  // Map data store of the |buffer| into the |image|'s.
+  bool MapImage(VAImage* image, void** buffer);
+
+  // Unmap |image|. This must happens after making changes to a mapped data
+  // store, so the server knows that the data is ready to be consumed.
+  void UnmapImage(VAImage* image);
+
+  // Put data from |va_surface_id| into |va_image|, converting/scaling it.
+  bool PutSurfaceIntoImage(VASurfaceID va_surface_id,
+                           VAImage* va_image);
+#endif
   // Returns true if the VAAPI version is less than the specified version.
   bool VAAPIVersionLessThan(int major, int minor);
 
   // Get a VAImage from a VASurface and map it into memory. The VAImage should
   // be released using the ReturnVaImage function. Returns true when successful.
   // This is intended for testing only.
   bool GetVaImageForTesting(VASurfaceID va_surface_id,
                             VAImage* image,
                             void** mem);
 
@@ skipping 21 matching lines @@
                                      size_t* coded_data_size);
 
   // Destroy all previously-allocated (and not yet destroyed) coded buffers.
   void DestroyCodedBuffers();
 
  private:
   VaapiWrapper();
 
   bool Initialize(CodecMode mode,
                   media::VideoCodecProfile profile,
+#if defined(USE_X11)
                   Display* x_display,
+#else
+                  int display,
+#endif
                   const base::Closure& report_error__to_uma_cb);
   void Deinitialize();
 
   // Execute pending job in hardware and destroy pending buffers. Return false
   // if vaapi driver refuses to accept parameter or slice buffers submitted
   // by client, or if execution fails in hardware.
   bool Execute(VASurfaceID va_surface_id);
 
   // Attempt to set render mode to "render to texture.". Failure is non-fatal.
   void TryToSetVADisplayAttributeToLocalGPU();
@@ skipping 31 matching lines @@
   // Called to report codec errors to UMA. Errors to clients are reported via
   // return values from public methods.
   base::Closure report_error_to_uma_cb_;
 
   DISALLOW_COPY_AND_ASSIGN(VaapiWrapper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_MEDIA_VAAPI_WRAPPER_H_