video_frame_buffer.h

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/*
 * Copyright (C) 2020 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
 
#pragma once
 
#include <stddef.h>
#include <stdint.h>
 
#include <memory>
 
namespace cuttlefish {
 
// Base class for video frame buffers. Subclasses provide
// format-specific accessors.
class VideoFrameBuffer {
 public:
  virtual ~VideoFrameBuffer() = default;
 
  virtual int width() const = 0;
  virtual int height() const = 0;
 
  // DRM_FORMAT_* fourcc, or 0 if unknown.
  virtual uint32_t PixelFormat() const { return 0; }
 
  virtual std::unique_ptr<VideoFrameBuffer> Clone() const = 0;
};
 
// Packed pixel formats (ABGR, ARGB, etc.).
class PackedVideoFrameBuffer : public VideoFrameBuffer {
 public:
  virtual uint8_t* Data() const = 0;
  virtual int Stride() const = 0;
  virtual size_t DataSize() const = 0;
};
 
// Planar YUV formats (I420, NV12, etc.).
class PlanarVideoFrameBuffer : public VideoFrameBuffer {
 public:
  virtual int StrideY() const = 0;
  virtual int StrideU() const = 0;
  virtual int StrideV() const = 0;
  virtual uint8_t* DataY() = 0;
  virtual uint8_t* DataU() = 0;
  virtual uint8_t* DataV() = 0;
  virtual size_t DataSizeY() const = 0;
  virtual size_t DataSizeU() const = 0;
  virtual size_t DataSizeV() const = 0;
};
 
}  // namespace cuttlefish