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// Copyright 2018 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 MEDIA_GPU_VIDEO_FRAME_MAPPER_H_
#define MEDIA_GPU_VIDEO_FRAME_MAPPER_H_
#include "base/memory/scoped_refptr.h"
#include "media/base/video_frame.h"
#include "media/base/video_types.h"
#include "media/gpu/media_gpu_export.h"
namespace media {
// The VideoFrameMapper interface allows mapping video frames into memory so
// that their contents can be accessed directly.
// VideoFrameMapper should be created by using VideoFrameMapperFactory.
class MEDIA_GPU_EXPORT VideoFrameMapper {
public:
VideoFrameMapper(const VideoFrameMapper&) = delete;
VideoFrameMapper& operator=(const VideoFrameMapper&) = delete;
virtual ~VideoFrameMapper() = default;
// Maps data referred by |video_frame| and creates a VideoFrame whose dtor
// unmap the mapped memory. The |permissions| parameter is a bitwise OR of the
// permissions the mapping needs if it uses mmap. Valid flags for this
// parameter are combinations of |PROT_READ| and |PROT_WRITE|.
virtual scoped_refptr<VideoFrame> Map(
scoped_refptr<const VideoFrame> video_frame,
int permissions) const = 0;
// Returns the allowed pixel format of video frames on Map().
VideoPixelFormat pixel_format() const { return format_; }
protected:
explicit VideoFrameMapper(VideoPixelFormat format) : format_(format) {}
// The allowed pixel format of video frames on Map().
VideoPixelFormat format_;
};
} // namespace media
#endif // MEDIA_GPU_VIDEO_FRAME_MAPPER_H_
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