summaryrefslogtreecommitdiff
path: root/dom/media/eme/CDMCaps.cpp
blob: 474ae70fc4663aec0f87adcf6be5a48812aed612 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "mozilla/CDMCaps.h"
#include "mozilla/EMEUtils.h"
#include "nsThreadUtils.h"
#include "SamplesWaitingForKey.h"

namespace mozilla {

CDMCaps::CDMCaps()
  : mMonitor("CDMCaps")
{
}

CDMCaps::~CDMCaps()
{
}

void
CDMCaps::Lock()
{
  mMonitor.Lock();
}

void
CDMCaps::Unlock()
{
  mMonitor.Unlock();
}

CDMCaps::AutoLock::AutoLock(CDMCaps& aInstance)
  : mData(aInstance)
{
  mData.Lock();
}

CDMCaps::AutoLock::~AutoLock()
{
  mData.Unlock();
}

// Keys with kGMPUsable, kGMPOutputDownscaled, or kGMPOutputRestricted status
// can be used by the CDM to decrypt or decrypt-and-decode samples.
static bool
IsUsableStatus(GMPMediaKeyStatus aStatus)
{
  return aStatus == kGMPUsable ||
         aStatus == kGMPOutputRestricted ||
         aStatus == kGMPOutputDownscaled;
}

bool
CDMCaps::AutoLock::IsKeyUsable(const CencKeyId& aKeyId)
{
  mData.mMonitor.AssertCurrentThreadOwns();
  for (const KeyStatus& keyStatus : mData.mKeyStatuses) {
    if (keyStatus.mId == aKeyId) {
      return IsUsableStatus(keyStatus.mStatus);
    }
  }
  return false;
}

bool
CDMCaps::AutoLock::SetKeyStatus(const CencKeyId& aKeyId,
                                const nsString& aSessionId,
                                GMPMediaKeyStatus aStatus)
{
  mData.mMonitor.AssertCurrentThreadOwns();
  KeyStatus key(aKeyId, aSessionId, aStatus);

  if (aStatus == kGMPUnknown) {
    // Return true if the element is found to notify key changes.
    return mData.mKeyStatuses.RemoveElement(key);
  }

  auto index = mData.mKeyStatuses.IndexOf(key);
  if (index != mData.mKeyStatuses.NoIndex) {
    if (mData.mKeyStatuses[index].mStatus == aStatus) {
      // No change.
      return false;
    }
    auto oldStatus = mData.mKeyStatuses[index].mStatus;
    mData.mKeyStatuses[index].mStatus = aStatus;
    // The old key status was one for which we can decrypt media. We don't
    // need to do the "notify usable" step below, as it should be impossible
    // for us to have anything waiting on this key to become usable, since it
    // was already usable.
    if (IsUsableStatus(oldStatus)) {
      return true;
    }
  } else {
    mData.mKeyStatuses.AppendElement(key);
  }

  // Only call NotifyUsable() for a key when we are going from non-usable
  // to usable state.
  if (!IsUsableStatus(aStatus)) {
    return true;
  }

  auto& waiters = mData.mWaitForKeys;
  size_t i = 0;
  while (i < waiters.Length()) {
    auto& w = waiters[i];
    if (w.mKeyId == aKeyId) {
      w.mListener->NotifyUsable(aKeyId);
      waiters.RemoveElementAt(i);
    } else {
      i++;
    }
  }
  return true;
}

void
CDMCaps::AutoLock::NotifyWhenKeyIdUsable(const CencKeyId& aKey,
                                         SamplesWaitingForKey* aListener)
{
  mData.mMonitor.AssertCurrentThreadOwns();
  MOZ_ASSERT(!IsKeyUsable(aKey));
  MOZ_ASSERT(aListener);
  mData.mWaitForKeys.AppendElement(WaitForKeys(aKey, aListener));
}

void
CDMCaps::AutoLock::GetKeyStatusesForSession(const nsAString& aSessionId,
                                            nsTArray<KeyStatus>& aOutKeyStatuses)
{
  for (const KeyStatus& keyStatus : mData.mKeyStatuses) {
    if (keyStatus.mSessionId.Equals(aSessionId)) {
      aOutKeyStatuses.AppendElement(keyStatus);
    }
  }
}

void
CDMCaps::AutoLock::GetSessionIdsForKeyId(const CencKeyId& aKeyId,
                                         nsTArray<nsCString>& aOutSessionIds)
{
  for (const KeyStatus& keyStatus : mData.mKeyStatuses) {
    if (keyStatus.mId == aKeyId) {
      aOutSessionIds.AppendElement(NS_ConvertUTF16toUTF8(keyStatus.mSessionId));
    }
  }
}

bool
CDMCaps::AutoLock::RemoveKeysForSession(const nsString& aSessionId)
{
  bool changed = false;
  nsTArray<KeyStatus> statuses;
  GetKeyStatusesForSession(aSessionId, statuses);
  for (const KeyStatus& keyStatus : statuses) {
    changed |= SetKeyStatus(keyStatus.mId, aSessionId, kGMPUnknown);
  }
  return changed;
}

} // namespace mozilla