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77 lines
3.2 KiB
Plaintext
77 lines
3.2 KiB
Plaintext
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// 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 media.mojom;
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import "media/mojo/interfaces/media_types.mojom";
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import "mojo/common/time.mojom";
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import "ui/gfx/geometry/mojo/geometry.mojom";
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// This file is the Mojo version of the media::VideoEncodeAccelerator interface
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// and describes the communication between a Client and a remote "service"
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// VideoEncodeAccelerator (VEA) with the purpose of encoding Video Frames by
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// means of hardware accelerated features.
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//
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// Client VideoEncodeAccelerator
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// | ---> Initialize |
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// | RequireBitstreamBuffers(N) <--- |
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// | ---> UseOutputBitstreamBuffer(0) |
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// | ---> UseOutputBitstreamBuffer(1) |
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// | ... |
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// = =
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// The Client requests a remote Encode() and eventually the VEA will leave the
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// encoded results in a pre-shared BitstreamBuffer, that is then restored to the
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// VEA when the Client is finished with it. Note that there might not be a 1:1
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// relationship between Encode() and BitstreamBufferReady() calls.
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// | ---> Encode() |
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// | BitstreamBufferReady(k) <--- |
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// | ---> UseOutputBitstreamBuffer(k) |
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// = =
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// At any time the VEA can send a NotifyError() to the Client. Similarly at any
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// time the Client can send a RequestEncodingParametersChange() to the VEA. None
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// of these messages are acknowledged.
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interface VideoEncodeAcceleratorProvider {
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CreateVideoEncodeAccelerator(VideoEncodeAccelerator& request);
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};
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interface VideoEncodeAccelerator {
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// See media::VideoEncodeAccelerator::Error
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enum Error {
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ILLEGAL_STATE,
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INVALID_ARGUMENT,
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PLATFORM_FAILURE
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};
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// Responded by VideoEncodeAcceleratorClient.RequireBitstreamBuffers().
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// TODO(mcasas): Update to asynchronous, https://crbug.com/744210.
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[Sync]
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Initialize(VideoPixelFormat input_format,
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gfx.mojom.Size input_visible_size,
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VideoCodecProfile output_profile,
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uint32 initial_bitrate,
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VideoEncodeAcceleratorClient client)
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=> (bool result);
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// Encodes a |frame|, being completely done with it after its callback.
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Encode(VideoFrame frame, bool force_keyframe) => ();
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UseOutputBitstreamBuffer(int32 bitstream_buffer_id,
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handle<shared_buffer> buffer);
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RequestEncodingParametersChange(uint32 bitrate, uint32 framerate);
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};
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interface VideoEncodeAcceleratorClient {
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// Response to VideoEncodeAccelerator.Initialize().
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RequireBitstreamBuffers(uint32 input_count,
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gfx.mojom.Size input_coded_size,
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uint32 output_buffer_size);
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BitstreamBufferReady(int32 bitstream_buffer_id, uint32 payload_size,
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bool key_frame, mojo.common.mojom.TimeDelta timestamp);
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NotifyError(VideoEncodeAccelerator.Error error);
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};
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