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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, 10 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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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 struct TimelineQuad { 36 struct TimelineQuad {
37 int64 reference_offset = 0; 37 int64 reference_offset = 0;
38 int64 target_offset = 0; 38 int64 target_offset = 0;
39 int32 reference_delta = 0; 39 int32 reference_delta = 0;
40 uint32 target_delta = 1; 40 uint32 target_delta = 1;
41 }; 41 };
42 42
43 // TimelineTransform 43 // TimelineTransform
44 // TODO(dalesat): Rename reference -> presentation. 44 // TODO(dalesat): Rename reference -> presentation.
45 // TODO(dalesat): Rename target -> reference. 45 // TODO(dalesat): Rename target -> reference.
46 // 46 //
47 // A structure which holds both a timeline quad, and a pair of identifiers which 47 // 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. 48 // define the specific timelines which are the reference and target timelines.
49 struct TimelineTransform { 49 struct TimelineTransform {
50 // TODO: These constants should probably defined by a central time management 50 // TODO: These constants should probably defined by a central time management
51 // service, not here. 51 // service, not here.
52 const uint32 kLocalTimeID = 0xFFFFFFFF; 52 const uint32 kLocalTimeID = 0xFFFFFFFF;
53 const uint32 kContextual = 0xFFFFFFFE; 53 const uint32 kContextual = 0xFFFFFFFE;
54 54
55 TimelineQuad quad; 55 TimelineQuad quad;
56 uint32 reference_timeline_id = kContextual; 56 uint32 reference_timeline_id = kContextual;
57 uint32 target_timeline_id = kLocalTimeID; 57 uint32 target_timeline_id = kLocalTimeID;
58 }; 58 };
59 59
60 // RateControl 60 // RateControl
61 // 61 //
62 // An interface typically exposed by media renderers which allow producers of 62 // 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 63 // 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 64 // renderer relate to real time. Users may initialize the transformation with a
65 // specific Quad, change the rate immediately in a first order contiguous 65 // 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 66 // fashion, or schedule ranges in the rate at points in time on either the
67 // reference or target timelines. 67 // reference or target timelines.
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79 // Configure the target timeline ID. Note, the reference timeline ID will 79 // Configure the target timeline ID. Note, the reference timeline ID will
80 // always be contextual. 80 // always be contextual.
81 SetTargetTimelineID(uint32 id); 81 SetTargetTimelineID(uint32 id);
82 82
83 // Immediately change the rate of the existing transformation in a fashion 83 // Immediately change the rate of the existing transformation in a fashion
84 // which is first order continuous with the current transformation. 84 // which is first order continuous with the current transformation.
85 SetRate(int32 reference_delta, uint32 target_delta); 85 SetRate(int32 reference_delta, uint32 target_delta);
86 86
87 // Schedule a first order continuous rate change at the specified reference 87 // Schedule a first order continuous rate change at the specified reference
88 // time. 88 // time.
89 SetRateAtReferenceTime(int32 reference_delta, 89 SetRateAtReferenceTime(int32 reference_delta, uint32 target_delta, int64 refer ence_time);
90 uint32 target_delta,
91 int64 reference_time);
92 90
93 // Schedule a first order continuous rate change at the specified target time. 91 // Schedule a first order continuous rate change at the specified target time.
94 SetRateAtTargetTime(int32 reference_delta, 92 SetRateAtTargetTime(int32 reference_delta, uint32 target_delta, int64 target_t ime);
95 uint32 target_delta,
96 int64 target_time);
97 93
98 // Cancel any pending rate changes 94 // Cancel any pending rate changes
99 CancelPendingChanges(); 95 CancelPendingChanges();
100 }; 96 };
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