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Side by Side Diff: mojo/services/media/common/interfaces/rate_control.mojom

Issue 1741963002: Auto-formatted all .mojom files. (Closed) Base URL: https://github.com/domokit/mojo.git@master
Patch Set: Created 4 years, 9 months ago
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1 // Copyright 2015 The Chromium Authors. All rights reserved. 1 // Copyright 2015 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be 2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file. 3 // found in the LICENSE file.
4 4
5 [DartPackage="mojo_services"] 5 [DartPackage="mojo_services"]
6 module mojo.media; 6 module mojo.media;
7 7
8 // TimelineQuad 8 // TimelineQuad
9 // TODO(dalesat): Rename reference -> presentation. 9 // TODO(dalesat): Rename reference -> presentation.
10 // TODO(dalesat): Rename target -> reference. 10 // TODO(dalesat): Rename target -> reference.
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26 // 26 //
27 // Given that r and t represent the same instant in time (in a single frame of 27 // Given that r and t represent the same instant in time (in a single frame of
28 // reference) 28 // reference)
29 // 29 //
30 // t = f(r) = (((r - ref_offset) * tgt_delta) / ref_delta) + tgt_offset 30 // t = f(r) = (((r - ref_offset) * tgt_delta) / ref_delta) + tgt_offset
31 // r = F(t) = (((t - tgt_offset) * ref_delta) / tgt_delta) + ref_offset 31 // r = F(t) = (((t - tgt_offset) * ref_delta) / tgt_delta) + ref_offset
32 // 32 //
33 // See also... 33 // See also...
34 // mojo/services/media/common/linear_transform.h 34 // mojo/services/media/common/linear_transform.h
35 // 35 //
36 // no-format
36 struct TimelineQuad { 37 struct TimelineQuad {
37 int64 reference_offset = 0; 38 int64 reference_offset = 0;
38 int64 target_offset = 0; 39 int64 target_offset = 0;
39 int32 reference_delta = 0; 40 int32 reference_delta = 0;
40 uint32 target_delta = 1; 41 uint32 target_delta = 1;
41 }; 42 };
43 // end-no-format
42 44
43 // TimelineTransform 45 // TimelineTransform
44 // TODO(dalesat): Rename reference -> presentation. 46 // TODO(dalesat): Rename reference -> presentation.
45 // TODO(dalesat): Rename target -> reference. 47 // TODO(dalesat): Rename target -> reference.
46 // 48 //
47 // A structure which holds both a timeline quad, and a pair of identifiers which 49 // A structure which holds both a timeline quad, and a pair of identifiers which
48 // define the specific timelines which are the reference and target timelines. 50 // define the specific timelines which are the reference and target timelines.
49 struct TimelineTransform { 51 struct TimelineTransform {
50 // TODO: These constants should probably defined by a central time management 52 // TODO: These constants should probably defined by a central time management
51 // service, not here. 53 // service, not here.
52 const uint32 kLocalTimeID = 0xFFFFFFFF; 54 const uint32 kLocalTimeID = 0xFFFFFFFF;
53 const uint32 kContextual = 0xFFFFFFFE; 55 const uint32 kContextual = 0xFFFFFFFE;
54 56
55 TimelineQuad quad; 57 TimelineQuad quad;
56 uint32 reference_timeline_id = kContextual; 58 uint32 reference_timeline_id = kContextual;
57 uint32 target_timeline_id = kLocalTimeID; 59 uint32 target_timeline_id = kLocalTimeID;
58 }; 60 };
59 61
60 // RateControl 62 // RateControl
61 // 63 //
62 // An interface typically exposed by media renderers which allow producers of 64 // An interface typically exposed by media renderers which allow producers of
63 // media to specify how the presentation time stamps of the media queued to the 65 // media to specify how the presentation time stamps of the media queued to the
64 // renderer relate to real time. Users may initialize the transformation with a 66 // renderer relate to real time. Users may initialize the transformation with a
65 // specific Quad, change the rate immediately in a first order contiguous 67 // specific Quad, change the rate immediately in a first order contiguous
66 // fashion, or schedule ranges in the rate at points in time on either the 68 // fashion, or schedule ranges in the rate at points in time on either the
67 // reference or target timelines. 69 // reference or target timelines.
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91 int64 reference_time); 93 int64 reference_time);
92 94
93 // Schedule a first order continuous rate change at the specified target time. 95 // Schedule a first order continuous rate change at the specified target time.
94 SetRateAtTargetTime(int32 reference_delta, 96 SetRateAtTargetTime(int32 reference_delta,
95 uint32 target_delta, 97 uint32 target_delta,
96 int64 target_time); 98 int64 target_time);
97 99
98 // Cancel any pending rate changes 100 // Cancel any pending rate changes
99 CancelPendingChanges(); 101 CancelPendingChanges();
100 }; 102 };
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