Reland: Introduce GpuVideoDecodeAcceleratorFactory.

content/public/gpu/gpu_video_decode_accelerator_factory.h

+// Copyright 2016 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.
+
+#ifndef CONTENT_PUBLIC_GPU_GPU_VIDEO_DECODE_ACCELERATOR_FACTORY_H_
+#define CONTENT_PUBLIC_GPU_GPU_VIDEO_DECODE_ACCELERATOR_FACTORY_H_
+
+#include "base/callback.h"
+#include "base/memory/weak_ptr.h"
+#include "content/common/content_export.h"
+#include "gpu/command_buffer/service/gpu_preferences.h"
+#include "gpu/config/gpu_info.h"
+#include "media/video/video_decode_accelerator.h"
+
+namespace gfx {
+class GLContext;
+}
+
+namespace gl {
+class GLImage;
+}
+
+namespace gpu {
+namespace gles2 {
+class GLES2Decoder;
+}
+}
+
+namespace content {
+
+class GpuVideoDecodeAcceleratorFactoryImpl;
+
+// This factory allows creation of VideoDecodeAccelerator implementations,
+// providing the most applicable VDA for current platform and given
+// configuration. To be used in GPU process only.
+class CONTENT_EXPORT GpuVideoDecodeAcceleratorFactory {
+ public:
+  virtual ~GpuVideoDecodeAcceleratorFactory();
+
+  // Return current GLContext.
+  using GetGLContextCallback = base::Callback<gfx::GLContext*(void)>;
+
+  // Make the applicable GL context current. To be called by VDAs before
+  // executing any GL calls. Return true on success, false otherwise.
+  using MakeGLContextCurrentCallback = base::Callback<bool(void)>;
+
+  // Bind |image| to |client_texture_id| given |texture_target|. If
+  // |can_bind_to_sampler| is true, then the image may be used as a sampler
+  // directly, otherwise a copy to a staging buffer is required.
+  // Return true on success, false otherwise.
+  using BindGLImageCallback =
+      base::Callback<bool(uint32_t client_texture_id,
+                          uint32_t texture_target,
+                          const scoped_refptr<gl::GLImage>& image,
+                          bool can_bind_to_sampler)>;
+
+  // Return a WeakPtr to a GLES2Decoder, if one is available.
+  using GetGLES2DecoderCallback =
+      base::Callback<base::WeakPtr<gpu::gles2::GLES2Decoder>(void)>;
+
+  // Create a factory capable of producing VDA instances for current platform.
+  static scoped_ptr<GpuVideoDecodeAcceleratorFactory> Create(
+      const GetGLContextCallback& get_gl_context_cb,
+      const MakeGLContextCurrentCallback& make_context_current_cb,
+      const BindGLImageCallback& bind_image_cb);
+
+  static scoped_ptr<GpuVideoDecodeAcceleratorFactory> CreateWithGLES2Decoder(
+      const GetGLContextCallback& get_gl_context_cb,
+      const MakeGLContextCurrentCallback& make_context_current_cb,
+      const BindGLImageCallback& bind_image_cb,
+      const GetGLES2DecoderCallback& get_gles2_decoder_cb);
+
+  // Return decoder capabilities supported on the current platform.
+  static gpu::VideoDecodeAcceleratorCapabilities GetDecoderCapabilities(
+      const gpu::GpuPreferences& gpu_preferences);
+
+  // Create a VDA for the current platform for |client| with the given |config|
+  // and for given |gpu_preferences|. Return nullptr on failure.
+  virtual scoped_ptr<media::VideoDecodeAccelerator> CreateVDA(
+      media::VideoDecodeAccelerator::Client* client,
+      const media::VideoDecodeAccelerator::Config& config,
+      const gpu::GpuPreferences& gpu_preferences);
+
+ private:
+  // TODO(posciak): This is temporary and will not be needed once
+  // GpuVideoDecodeAcceleratorFactoryImpl implements
+  // GpuVideoDecodeAcceleratorFactory, see crbug.com/597150 and related.
+  GpuVideoDecodeAcceleratorFactory(
+      scoped_ptr<GpuVideoDecodeAcceleratorFactoryImpl> gvdafactory_impl);
+
+  scoped_ptr<GpuVideoDecodeAcceleratorFactoryImpl> gvdafactory_impl_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_GPU_GPU_VIDEO_DECODE_ACCELERATOR_FACTORY_H_