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/* -*- 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() = default;
CDMCaps::~CDMCaps() = default;
// 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::IsKeyUsable(const CencKeyId& aKeyId) {
for (const KeyStatus& keyStatus : mKeyStatuses) {
if (keyStatus.mId == aKeyId) {
return IsUsableStatus(keyStatus.mStatus);
}
}
return false;
}
bool CDMCaps::SetKeyStatus(const CencKeyId& aKeyId, const nsString& aSessionId,
const dom::Optional<dom::MediaKeyStatus>& aStatus) {
if (!aStatus.WasPassed()) {
// Called from ForgetKeyStatus.
// Return true if the element is found to notify key changes.
return mKeyStatuses.RemoveElement(
KeyStatus(aKeyId, aSessionId, dom::MediaKeyStatus::Internal_error));
}
KeyStatus key(aKeyId, aSessionId, aStatus.Value());
auto index = mKeyStatuses.IndexOf(key);
if (index != mKeyStatuses.NoIndex) {
if (mKeyStatuses[index].mStatus == aStatus.Value()) {
// No change.
return false;
}
auto oldStatus = mKeyStatuses[index].mStatus;
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 {
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 = 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::NotifyWhenKeyIdUsable(const CencKeyId& aKey,
SamplesWaitingForKey* aListener) {
MOZ_ASSERT(!IsKeyUsable(aKey));
MOZ_ASSERT(aListener);
mWaitForKeys.AppendElement(WaitForKeys(aKey, aListener));
}
void CDMCaps::GetKeyStatusesForSession(const nsAString& aSessionId,
nsTArray<KeyStatus>& aOutKeyStatuses) {
for (const KeyStatus& keyStatus : mKeyStatuses) {
if (keyStatus.mSessionId.Equals(aSessionId)) {
aOutKeyStatuses.AppendElement(keyStatus);
}
}
}
bool CDMCaps::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