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47 lines
2.1 KiB
Plaintext
47 lines
2.1 KiB
Plaintext
// Copyright 2017 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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module video_capture.mojom;
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import "media/capture/mojo/video_capture_types.mojom";
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import "media/mojo/interfaces/media_types.mojom";
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import "services/video_capture/public/interfaces/producer.mojom";
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import "ui/gfx/geometry/mojo/geometry.mojom";
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// Interface for a producer to feed video frames into a virtual
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// device. These frames will appear to the consumer of the device
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// as if they were produced by a real device.
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//
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// The buffers used for transporting video frames are managed by
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// this interface, and are obtained from a finite size buffer pool.
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// When the producer wants to push a frame, it will first request a buffer
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// via |RequestFrameBuffer|, and a buffer ID will be provided in the
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// response. In the process of assigning a buffer to the producer, a new
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// buffer might be created and/or an old buffer might be retired.
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//
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// To avoid the remapping of buffers in producer after each buffer
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// request, a separate interface |Producer| is used for notifying the
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// producer with the buffer information changes. It is producer's
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// responsibility for caching the buffer information.
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interface VirtualDevice {
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// This is used by the producer for requesting a buffer to store frame
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// data. The frame can subsequently be pushed via |OnFrameReadyInBuffer|.
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// An invalid buffer ID |Constants.kInvalidBufferId| will be returned
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// if no buffer is available.
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//
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// Note: A new buffer might be created and/or an old buffer might be
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// retired as a side-effect of the request. In that case,
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// |Producer.OnNewBufferHandle| and/or |Producer.OnBufferRetired|
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// will be invoked.
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RequestFrameBuffer(gfx.mojom.Size dimension,
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media.mojom.VideoPixelFormat pixel_format,
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media.mojom.VideoPixelStorage pixel_storage)
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=> (int32 buffer_id);
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// Called to indicate that a video frame is ready in the given buffer
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// |buffer_id|.
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OnFrameReadyInBuffer(int32 buffer_id,
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media.mojom.VideoFrameInfo frame_info);
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};
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