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-rw-r--r--dom/media/eme/CDMCaps.cpp170
1 files changed, 170 insertions, 0 deletions
diff --git a/dom/media/eme/CDMCaps.cpp b/dom/media/eme/CDMCaps.cpp
new file mode 100644
index 000000000..20ff63bad
--- /dev/null
+++ b/dom/media/eme/CDMCaps.cpp
@@ -0,0 +1,170 @@
+/* -*- 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 MediaKeyStatus::Usable, MediaKeyStatus::Output_downscaled,
+// or MediaKeyStatus::Output_restricted status can be used by the CDM
+// to decrypt or decrypt-and-decode samples.
+static bool
+IsUsableStatus(dom::MediaKeyStatus aStatus)
+{
+ return aStatus == dom::MediaKeyStatus::Usable ||
+ aStatus == dom::MediaKeyStatus::Output_restricted ||
+ aStatus == dom::MediaKeyStatus::Output_downscaled;
+}
+
+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,
+ const dom::Optional<dom::MediaKeyStatus>& aStatus)
+{
+ mData.mMonitor.AssertCurrentThreadOwns();
+
+ if (!aStatus.WasPassed()) {
+ // Called from ForgetKeyStatus.
+ // Return true if the element is found to notify key changes.
+ return mData.mKeyStatuses.RemoveElement(KeyStatus(aKeyId,
+ aSessionId,
+ dom::MediaKeyStatus::Internal_error));
+ }
+
+ KeyStatus key(aKeyId, aSessionId, aStatus.Value());
+ auto index = mData.mKeyStatuses.IndexOf(key);
+ if (index != mData.mKeyStatuses.NoIndex) {
+ if (mData.mKeyStatuses[index].mStatus == aStatus.Value()) {
+ // No change.
+ return false;
+ }
+ auto oldStatus = mData.mKeyStatuses[index].mStatus;
+ mData.mKeyStatuses[index].mStatus = aStatus.Value();
+ // 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.Value())) {
+ 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& status : statuses) {
+ changed |= SetKeyStatus(status.mId,
+ aSessionId,
+ dom::Optional<dom::MediaKeyStatus>());
+ }
+ return changed;
+}
+
+} // namespace mozilla