1 files changed, 79 insertions, 0 deletions
diff --git a/dom/media/platforms/agnostic/eme/SamplesWaitingForKey.cpp b/dom/media/platforms/agnostic/eme/SamplesWaitingForKey.cpp
new file mode 100644
index 0000000000..23d79ce56a
--- /dev/null
+++ b/dom/media/platforms/agnostic/eme/SamplesWaitingForKey.cpp
@@ -0,0 +1,79 @@
+/* -*- 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 "SamplesWaitingForKey.h"
+
+#include "MediaData.h"
+#include "MediaEventSource.h"
+#include "mozilla/CDMCaps.h"
+#include "mozilla/CDMProxy.h"
+#include "mozilla/TaskQueue.h"
+
+namespace mozilla {
+
+SamplesWaitingForKey::SamplesWaitingForKey(
+    CDMProxy* aProxy, TrackInfo::TrackType aType,
+    const std::function<MediaEventProducer<TrackInfo::TrackType>*()>&
+        aOnWaitingForKeyEvent)
+    : mMutex("SamplesWaitingForKey"),
+      mProxy(aProxy),
+      mType(aType),
+      mOnWaitingForKeyEvent(aOnWaitingForKeyEvent) {}
+
+SamplesWaitingForKey::~SamplesWaitingForKey() { Flush(); }
+
+RefPtr<SamplesWaitingForKey::WaitForKeyPromise>
+SamplesWaitingForKey::WaitIfKeyNotUsable(MediaRawData* aSample) {
+  if (!aSample || !aSample->mCrypto.IsEncrypted() || !mProxy) {
+    return WaitForKeyPromise::CreateAndResolve(aSample, __func__);
+  }
+  auto caps = mProxy->Capabilites().Lock();
+  const auto& keyid = aSample->mCrypto.mKeyId;
+  if (caps->IsKeyUsable(keyid)) {
+    return WaitForKeyPromise::CreateAndResolve(aSample, __func__);
+  }
+  SampleEntry entry;
+  entry.mSample = aSample;
+  RefPtr<WaitForKeyPromise> p = entry.mPromise.Ensure(__func__);
+  {
+    MutexAutoLock lock(mMutex);
+    mSamples.AppendElement(std::move(entry));
+  }
+  if (mOnWaitingForKeyEvent && mOnWaitingForKeyEvent()) {
+    mOnWaitingForKeyEvent()->Notify(mType);
+  }
+  caps->NotifyWhenKeyIdUsable(aSample->mCrypto.mKeyId, this);
+  return p;
+}
+
+void SamplesWaitingForKey::NotifyUsable(const CencKeyId& aKeyId) {
+  MutexAutoLock lock(mMutex);
+  size_t i = 0;
+  while (i < mSamples.Length()) {
+    auto& entry = mSamples[i];
+    if (aKeyId == entry.mSample->mCrypto.mKeyId) {
+      entry.mPromise.Resolve(entry.mSample, __func__);
+      mSamples.RemoveElementAt(i);
+    } else {
+      i++;
+    }
+  }
+}
+
+void SamplesWaitingForKey::Flush() {
+  MutexAutoLock lock(mMutex);
+  for (auto& sample : mSamples) {
+    sample.mPromise.Reject(true, __func__);
+  }
+  mSamples.Clear();
+}
+
+void SamplesWaitingForKey::BreakCycles() {
+  MutexAutoLock lock(mMutex);
+  mProxy = nullptr;
+}
+
+}  // namespace mozilla