/src/mozilla-central/dom/media/eme/CDMCaps.cpp
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1 | | /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
2 | | /* vim: set ts=8 sts=2 et sw=2 tw=80: */ |
3 | | /* This Source Code Form is subject to the terms of the Mozilla Public |
4 | | * License, v. 2.0. If a copy of the MPL was not distributed with this file, |
5 | | * You can obtain one at http://mozilla.org/MPL/2.0/. */ |
6 | | |
7 | | #include "mozilla/CDMCaps.h" |
8 | | #include "mozilla/EMEUtils.h" |
9 | | #include "nsThreadUtils.h" |
10 | | #include "SamplesWaitingForKey.h" |
11 | | |
12 | | namespace mozilla { |
13 | | |
14 | | CDMCaps::CDMCaps() |
15 | 0 | { |
16 | 0 | } |
17 | | |
18 | | CDMCaps::~CDMCaps() |
19 | 0 | { |
20 | 0 | } |
21 | | |
22 | | // Keys with MediaKeyStatus::Usable, MediaKeyStatus::Output_downscaled, |
23 | | // or MediaKeyStatus::Output_restricted status can be used by the CDM |
24 | | // to decrypt or decrypt-and-decode samples. |
25 | | static bool |
26 | | IsUsableStatus(dom::MediaKeyStatus aStatus) |
27 | 0 | { |
28 | 0 | return aStatus == dom::MediaKeyStatus::Usable || |
29 | 0 | aStatus == dom::MediaKeyStatus::Output_restricted || |
30 | 0 | aStatus == dom::MediaKeyStatus::Output_downscaled; |
31 | 0 | } |
32 | | |
33 | | bool |
34 | | CDMCaps::IsKeyUsable(const CencKeyId& aKeyId) |
35 | 0 | { |
36 | 0 | for (const KeyStatus& keyStatus : mKeyStatuses) { |
37 | 0 | if (keyStatus.mId == aKeyId) { |
38 | 0 | return IsUsableStatus(keyStatus.mStatus); |
39 | 0 | } |
40 | 0 | } |
41 | 0 | return false; |
42 | 0 | } |
43 | | |
44 | | bool |
45 | | CDMCaps::SetKeyStatus(const CencKeyId& aKeyId, |
46 | | const nsString& aSessionId, |
47 | | const dom::Optional<dom::MediaKeyStatus>& aStatus) |
48 | 0 | { |
49 | 0 | if (!aStatus.WasPassed()) { |
50 | 0 | // Called from ForgetKeyStatus. |
51 | 0 | // Return true if the element is found to notify key changes. |
52 | 0 | return mKeyStatuses.RemoveElement( |
53 | 0 | KeyStatus(aKeyId, aSessionId, dom::MediaKeyStatus::Internal_error)); |
54 | 0 | } |
55 | 0 | |
56 | 0 | KeyStatus key(aKeyId, aSessionId, aStatus.Value()); |
57 | 0 | auto index = mKeyStatuses.IndexOf(key); |
58 | 0 | if (index != mKeyStatuses.NoIndex) { |
59 | 0 | if (mKeyStatuses[index].mStatus == aStatus.Value()) { |
60 | 0 | // No change. |
61 | 0 | return false; |
62 | 0 | } |
63 | 0 | auto oldStatus = mKeyStatuses[index].mStatus; |
64 | 0 | mKeyStatuses[index].mStatus = aStatus.Value(); |
65 | 0 | // The old key status was one for which we can decrypt media. We don't |
66 | 0 | // need to do the "notify usable" step below, as it should be impossible |
67 | 0 | // for us to have anything waiting on this key to become usable, since it |
68 | 0 | // was already usable. |
69 | 0 | if (IsUsableStatus(oldStatus)) { |
70 | 0 | return true; |
71 | 0 | } |
72 | 0 | } else { |
73 | 0 | mKeyStatuses.AppendElement(key); |
74 | 0 | } |
75 | 0 |
|
76 | 0 | // Only call NotifyUsable() for a key when we are going from non-usable |
77 | 0 | // to usable state. |
78 | 0 | if (!IsUsableStatus(aStatus.Value())) { |
79 | 0 | return true; |
80 | 0 | } |
81 | 0 | |
82 | 0 | auto& waiters = mWaitForKeys; |
83 | 0 | size_t i = 0; |
84 | 0 | while (i < waiters.Length()) { |
85 | 0 | auto& w = waiters[i]; |
86 | 0 | if (w.mKeyId == aKeyId) { |
87 | 0 | w.mListener->NotifyUsable(aKeyId); |
88 | 0 | waiters.RemoveElementAt(i); |
89 | 0 | } else { |
90 | 0 | i++; |
91 | 0 | } |
92 | 0 | } |
93 | 0 | return true; |
94 | 0 | } |
95 | | |
96 | | void |
97 | | CDMCaps::NotifyWhenKeyIdUsable(const CencKeyId& aKey, |
98 | | SamplesWaitingForKey* aListener) |
99 | 0 | { |
100 | 0 | MOZ_ASSERT(!IsKeyUsable(aKey)); |
101 | 0 | MOZ_ASSERT(aListener); |
102 | 0 | mWaitForKeys.AppendElement(WaitForKeys(aKey, aListener)); |
103 | 0 | } |
104 | | |
105 | | void |
106 | | CDMCaps::GetKeyStatusesForSession(const nsAString& aSessionId, |
107 | | nsTArray<KeyStatus>& aOutKeyStatuses) |
108 | 0 | { |
109 | 0 | for (const KeyStatus& keyStatus : mKeyStatuses) { |
110 | 0 | if (keyStatus.mSessionId.Equals(aSessionId)) { |
111 | 0 | aOutKeyStatuses.AppendElement(keyStatus); |
112 | 0 | } |
113 | 0 | } |
114 | 0 | } |
115 | | |
116 | | bool |
117 | | CDMCaps::RemoveKeysForSession(const nsString& aSessionId) |
118 | 0 | { |
119 | 0 | bool changed = false; |
120 | 0 | nsTArray<KeyStatus> statuses; |
121 | 0 | GetKeyStatusesForSession(aSessionId, statuses); |
122 | 0 | for (const KeyStatus& status : statuses) { |
123 | 0 | changed |= SetKeyStatus(status.mId, |
124 | 0 | aSessionId, |
125 | 0 | dom::Optional<dom::MediaKeyStatus>()); |
126 | 0 | } |
127 | 0 | return changed; |
128 | 0 | } |
129 | | |
130 | | } // namespace mozilla |