Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

12 files changed, 1654 insertions, 0 deletions

diff --git a/dom/media/mediacapabilities/BenchmarkStorageChild.cpp b/dom/media/mediacapabilities/BenchmarkStorageChild.cpp
new file mode 100644
index 0000000000..32bf9adac2
--- /dev/null
+++ b/dom/media/mediacapabilities/BenchmarkStorageChild.cpp
@@ -0,0 +1,36 @@
+/* -*- 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 "BenchmarkStorageChild.h"
+#include "mozilla/dom/ContentChild.h"
+
+namespace mozilla {
+
+static PBenchmarkStorageChild* sChild = nullptr;
+
+/* static */
+PBenchmarkStorageChild* BenchmarkStorageChild::Instance() {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (!sChild) {
+    sChild = new BenchmarkStorageChild();
+    PContentChild* contentChild = dom::ContentChild::GetSingleton();
+    MOZ_ASSERT(contentChild);
+    if (!contentChild->SendPBenchmarkStorageConstructor()) {
+      MOZ_CRASH("SendPBenchmarkStorageConstructor failed");
+    }
+  }
+  MOZ_ASSERT(sChild);
+  return sChild;
+}
+
+BenchmarkStorageChild::~BenchmarkStorageChild() {
+  MOZ_ASSERT(NS_IsMainThread());
+  if (sChild == this) {
+    sChild = nullptr;
+  }
+}
+
+}  // namespace mozilla
diff --git a/dom/media/mediacapabilities/BenchmarkStorageChild.h b/dom/media/mediacapabilities/BenchmarkStorageChild.h
new file mode 100644
index 0000000000..c53571e13b
--- /dev/null
+++ b/dom/media/mediacapabilities/BenchmarkStorageChild.h
@@ -0,0 +1,28 @@
+/* -*- 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/. */
+
+#ifndef include_dom_media_mediacapabilities_BenchmarkStorageChild_h
+#define include_dom_media_mediacapabilities_BenchmarkStorageChild_h
+
+#include "mozilla/PBenchmarkStorageChild.h"
+
+namespace mozilla {
+
+class BenchmarkStorageChild : public PBenchmarkStorageChild {
+ public:
+  /* Singleton class to avoid recreating the protocol every time we need access
+   * to the storage. */
+  static PBenchmarkStorageChild* Instance();
+
+  ~BenchmarkStorageChild();
+
+ private:
+  BenchmarkStorageChild() = default;
+};
+
+}  // namespace mozilla
+
+#endif  // include_dom_media_mediacapabilities_BenchmarkStorageChild_h
diff --git a/dom/media/mediacapabilities/BenchmarkStorageParent.cpp b/dom/media/mediacapabilities/BenchmarkStorageParent.cpp
new file mode 100644
index 0000000000..64ae6ddd44
--- /dev/null
+++ b/dom/media/mediacapabilities/BenchmarkStorageParent.cpp
@@ -0,0 +1,130 @@
+/* -*- 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 "BenchmarkStorageParent.h"
+#include "KeyValueStorage.h"
+
+namespace mozilla {
+
+/* Moving average window size. */
+const int32_t AVG_WINDOW = 20;
+/* Calculate the moving average for the new value aValue for the current window
+ * aWindow and the already existing average aAverage. When the method returns
+ * aAverage will contain the new average and aWindow will contain the new
+ * window.*/
+void BenchmarkStorageParent::MovingAverage(int32_t& aAverage, int32_t& aWindow,
+                                           const int32_t aValue) {
+  if (aWindow < AVG_WINDOW) {
+    aAverage = (aAverage * aWindow + aValue) / (aWindow + 1);
+    aWindow++;
+    return;
+  }
+  MOZ_ASSERT(aWindow == AVG_WINDOW);
+  aAverage = (aAverage - aAverage / aWindow) + (aValue / aWindow);
+}
+
+/* In order to decrease the number of times the database is accessed when the
+ * moving average is stored or retrieved we use the same value to store _both_
+ * the window and the average. The range of the average is limited since it is
+ * a percentage (0-100), and the range of the window is limited
+ * (1-20). Thus the number that is stored in the database is in the form
+ * (digits): WWAAA. For example, the value stored when an average(A) of 88
+ * corresponds to a window(W) 7 is 7088. The average of 100 that corresponds to
+ * a window of 20 is 20100. The following methods are helpers to extract or
+ * construct the stored value according to the above. */
+
+/* Stored value will be in the form WWAAA(19098). We need to extract the window
+ * (19) and the average score (98). The aValue will
+ * be parsed, the aWindow will contain the window (of the moving average) and
+ * the return value will contain the average itself. */
+int32_t BenchmarkStorageParent::ParseStoredValue(int32_t aValue,
+                                                 int32_t& aWindow) {
+  MOZ_ASSERT(aValue > 999);
+  MOZ_ASSERT(aValue < 100000);
+
+  int32_t score = aValue % 1000;
+  aWindow = (aValue / 1000) % 100;
+  return score;
+}
+
+int32_t BenchmarkStorageParent::PrepareStoredValue(int32_t aScore,
+                                                   int32_t aWindow) {
+  MOZ_ASSERT(aScore >= 0);
+  MOZ_ASSERT(aScore <= 100);
+  MOZ_ASSERT(aWindow > 0);
+  MOZ_ASSERT(aWindow < 21);
+
+  return aWindow * 1000 + aScore;
+}
+
+BenchmarkStorageParent::BenchmarkStorageParent()
+    : mStorage(new KeyValueStorage) {}
+
+IPCResult BenchmarkStorageParent::RecvPut(const nsCString& aDbName,
+                                          const nsCString& aKey,
+                                          const int32_t& aValue) {
+  // In order to calculate and store the new moving average, we need to get the
+  // stored value and window first, to calculate the new score and window, and
+  // then to store the new aggregated value.
+  mStorage->Get(aDbName, aKey)
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [storage = mStorage, aDbName, aKey, aValue](int32_t aResult) {
+            int32_t window = 0;
+            int32_t average = 0;
+            if (aResult >= 0) {
+              // The key found.
+              average = ParseStoredValue(aResult, window);
+            }
+            MovingAverage(average, window, aValue);
+            int32_t newValue = PrepareStoredValue(average, window);
+            // Avoid storing if the values are the same. This is an optimization
+            // to minimize the disk usage.
+            if (aResult != newValue) {
+              storage->Put(aDbName, aKey, newValue);
+            }
+          },
+          [](nsresult rv) { /*do nothing*/ });
+
+  return IPC_OK();
+}
+
+IPCResult BenchmarkStorageParent::RecvGet(const nsCString& aDbName,
+                                          const nsCString& aKey,
+                                          GetResolver&& aResolve) {
+  mStorage->Get(aDbName, aKey)
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [aResolve](int32_t aResult) {
+            int32_t window = 0;  // not used
+            aResolve(aResult < 0 ? -1 : ParseStoredValue(aResult, window));
+          },
+          [aResolve](nsresult rv) { aResolve(-1); });
+
+  return IPC_OK();
+}
+
+IPCResult BenchmarkStorageParent::RecvCheckVersion(const nsCString& aDbName,
+                                                   int32_t aVersion) {
+  mStorage->Get(aDbName, "Version"_ns)
+      ->Then(
+          GetCurrentSerialEventTarget(), __func__,
+          [storage = mStorage, aDbName, aVersion](int32_t aResult) {
+            if (aVersion != aResult) {
+              storage->Clear(aDbName)->Then(
+                  GetCurrentSerialEventTarget(), __func__,
+                  [storage, aDbName, aVersion](bool) {
+                    storage->Put(aDbName, "Version"_ns, aVersion);
+                  },
+                  [](nsresult rv) { /*do nothing*/ });
+            }
+          },
+          [](nsresult rv) { /*do nothing*/ });
+
+  return IPC_OK();
+}
+
+};  // namespace mozilla
diff --git a/dom/media/mediacapabilities/BenchmarkStorageParent.h b/dom/media/mediacapabilities/BenchmarkStorageParent.h
new file mode 100644
index 0000000000..e9c8f9dd9b
--- /dev/null
+++ b/dom/media/mediacapabilities/BenchmarkStorageParent.h
@@ -0,0 +1,43 @@
+/* -*- 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/. */
+
+#ifndef include_dom_media_mediacapabilities_BenchmarkStorageParent_h
+#define include_dom_media_mediacapabilities_BenchmarkStorageParent_h
+
+#include "mozilla/PBenchmarkStorageParent.h"
+
+namespace mozilla {
+class KeyValueStorage;
+
+using mozilla::ipc::IPCResult;
+
+class BenchmarkStorageParent : public PBenchmarkStorageParent {
+  friend class PBenchmarkStorageParent;
+
+ public:
+  BenchmarkStorageParent();
+
+  IPCResult RecvPut(const nsCString& aDbName, const nsCString& aKey,
+                    const int32_t& aValue);
+
+  IPCResult RecvGet(const nsCString& aDbName, const nsCString& aKey,
+                    GetResolver&& aResolve);
+
+  IPCResult RecvCheckVersion(const nsCString& aDbName, int32_t aVersion);
+
+  /* Helper methods exposed here to be tested via gtest. */
+  static void MovingAverage(int32_t& aAverage, int32_t& aWindow,
+                            const int32_t aValue);
+  static int32_t ParseStoredValue(int32_t aValue, int32_t& aWindow);
+  static int32_t PrepareStoredValue(int32_t aScore, int32_t aWindow);
+
+ private:
+  RefPtr<KeyValueStorage> mStorage;
+};
+
+}  // namespace mozilla
+
+#endif  // include_dom_media_mediacapabilities_BenchmarkStorageParent_h
diff --git a/dom/media/mediacapabilities/DecoderBenchmark.cpp b/dom/media/mediacapabilities/DecoderBenchmark.cpp
new file mode 100644
index 0000000000..b5c9a2a693
--- /dev/null
+++ b/dom/media/mediacapabilities/DecoderBenchmark.cpp
@@ -0,0 +1,243 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 "DecoderBenchmark.h"
+#include "mozilla/BenchmarkStorageChild.h"
+#include "mozilla/media/MediaUtils.h"
+#include "mozilla/StaticPrefs_media.h"
+
+namespace mozilla {
+
+void DecoderBenchmark::StoreScore(const nsACString& aDecoderName,
+                                  const nsACString& aKey,
+                                  RefPtr<FrameStatistics> aStats) {
+  FrameStatisticsData statsData = aStats->GetFrameStatisticsData();
+  uint64_t totalFrames = FrameStatistics::GetTotalFrames(statsData);
+  uint64_t droppedFrames = FrameStatistics::GetDroppedFrames(statsData);
+
+  MOZ_ASSERT(droppedFrames <= totalFrames);
+  MOZ_ASSERT(totalFrames >= mLastTotalFrames);
+  MOZ_ASSERT(droppedFrames >= mLastDroppedFrames);
+
+  uint64_t diffTotalFrames = totalFrames - mLastTotalFrames;
+  uint64_t diffDroppedFrames = droppedFrames - mLastDroppedFrames;
+
+  /* Update now in case the method returns at the if check bellow. */
+  mLastTotalFrames = totalFrames;
+  mLastDroppedFrames = droppedFrames;
+
+  /* A minimum number of 10 frames is required to store the score. */
+  if (diffTotalFrames < 10) {
+    return;
+  }
+
+  int32_t percentage =
+      100 - 100 * float(diffDroppedFrames) / float(diffTotalFrames);
+
+  MOZ_ASSERT(percentage >= 0);
+
+  Put(aDecoderName, aKey, percentage);
+}
+
+void DecoderBenchmark::Put(const nsACString& aDecoderName,
+                           const nsACString& aKey, int32_t aValue) {
+  MOZ_ASSERT(NS_IsMainThread());
+  const nsCString name(aDecoderName);
+  const nsCString key(aKey);
+  BenchmarkStorageChild::Instance()->SendPut(name, key, aValue);
+}
+
+RefPtr<BenchmarkScorePromise> DecoderBenchmark::GetScore(
+    const nsACString& aDecoderName, const nsACString& aKey) {
+  if (NS_IsMainThread()) {
+    return Get(aDecoderName, aKey);
+  }
+
+  RefPtr<DecoderBenchmark> self = this;
+  const nsCString decoderName(aDecoderName);
+  const nsCString key(aKey);
+  return InvokeAsync(
+      GetMainThreadSerialEventTarget(), __func__,
+      [self, decoderName, key] { return self->Get(decoderName, key); });
+}
+
+RefPtr<BenchmarkScorePromise> DecoderBenchmark::Get(
+    const nsACString& aDecoderName, const nsACString& aKey) {
+  MOZ_ASSERT(NS_IsMainThread());
+
+  const nsCString name(aDecoderName);
+  const nsCString key(aKey);
+  return BenchmarkStorageChild::Instance()->SendGet(name, key)->Then(
+      GetCurrentSerialEventTarget(), __func__,
+      [](int32_t aResult) {
+        return BenchmarkScorePromise::CreateAndResolve(aResult, __func__);
+      },
+      [](ipc::ResponseRejectReason&&) {
+        return BenchmarkScorePromise::CreateAndReject(NS_ERROR_FAILURE,
+                                                      __func__);
+      });
+}
+
+/* The key string consists of the video properties resolution, framerate,
+ * and bitdepth. There are various levels for each of them. The key is
+ * formated by the closest level, for example, a video with width=1920,
+ * height=1080, frameRate=24, and bitdepth=8bit will have the key:
+ * "ResolutionLevel5-FrameRateLevel1-8bit". */
+
+#define NELEMS(x) (sizeof(x) / sizeof((x)[0]))
+
+/* Keep them sorted */
+const uint32_t PixelLevels[] = {
+    /* 256x144   =*/36864,
+    /* 426x240   =*/102240,
+    /* 640x360   =*/230400,
+    /* 854x480   =*/409920,
+    /* 1280x720  =*/921600,
+    /* 1920x1080 =*/2073600,
+    /* 2560x1440 =*/3686400,
+    /* 3840x2160 =*/8294400,
+};
+const size_t PixelLevelsSize = NELEMS(PixelLevels);
+
+const uint32_t FrameRateLevels[] = {
+    15, 24, 30, 50, 60,
+};
+const size_t FrameRateLevelsSize = NELEMS(FrameRateLevels);
+
+/* static */
+nsCString KeyUtil::FindLevel(const uint32_t aLevels[], const size_t length,
+                             uint32_t aValue) {
+  MOZ_ASSERT(aValue);
+  if (aValue <= aLevels[0]) {
+    return "Level0"_ns;
+  }
+  nsAutoCString level("Level");
+  size_t lastIndex = length - 1;
+  if (aValue >= aLevels[lastIndex]) {
+    level.AppendInt(static_cast<uint32_t>(lastIndex));
+    return std::move(level);
+  }
+  for (size_t i = 0; i < lastIndex; ++i) {
+    if (aValue >= aLevels[i + 1]) {
+      continue;
+    }
+    if (aValue - aLevels[i] < aLevels[i + 1] - aValue) {
+      level.AppendInt(static_cast<uint32_t>(i));
+      return std::move(level);
+    }
+    level.AppendInt(static_cast<uint32_t>(i + 1));
+    return std::move(level);
+  }
+  MOZ_CRASH("Array is not sorted");
+  return ""_ns;
+}
+
+/* static */
+nsCString KeyUtil::BitDepthToStr(uint8_t aBitDepth) {
+  switch (aBitDepth) {
+    case 8:  // ColorDepth::COLOR_8
+      return "-8bit"_ns;
+    case 10:  // ColorDepth::COLOR_10
+    case 12:  // ColorDepth::COLOR_12
+    case 16:  // ColorDepth::COLOR_16
+      return "-non8bit"_ns;
+  }
+  MOZ_ASSERT_UNREACHABLE("invalid color depth value");
+  return ""_ns;
+}
+
+/* static */
+nsCString KeyUtil::CreateKey(const DecoderBenchmarkInfo& aBenchInfo) {
+  nsAutoCString key("Resolution");
+  key.Append(FindLevel(PixelLevels, PixelLevelsSize,
+                       aBenchInfo.mWidth * aBenchInfo.mHeight));
+
+  key.Append("-FrameRate");
+  key.Append(
+      FindLevel(FrameRateLevels, FrameRateLevelsSize, aBenchInfo.mFrameRate));
+
+  key.Append(BitDepthToStr(aBenchInfo.mBitDepth));
+
+  return std::move(key);
+}
+
+void DecoderBenchmark::Store(const DecoderBenchmarkInfo& aBenchInfo,
+                             RefPtr<FrameStatistics> aStats) {
+  if (!XRE_IsContentProcess()) {
+    NS_WARNING(
+        "Storing a benchmark is only allowed only from the content process.");
+    return;
+  }
+  StoreScore(aBenchInfo.mContentType, KeyUtil::CreateKey(aBenchInfo), aStats);
+}
+
+/* static */
+RefPtr<BenchmarkScorePromise> DecoderBenchmark::Get(
+    const DecoderBenchmarkInfo& aBenchInfo) {
+  if (!XRE_IsContentProcess()) {
+    NS_WARNING(
+        "Getting a benchmark is only allowed only from the content process.");
+    return BenchmarkScorePromise::CreateAndReject(NS_ERROR_FAILURE, __func__);
+  }
+  // There is no need for any of the data members to query the database, thus
+  // it can be a static method.
+  auto bench = MakeRefPtr<DecoderBenchmark>();
+  return bench->GetScore(aBenchInfo.mContentType,
+                         KeyUtil::CreateKey(aBenchInfo));
+}
+
+static nsTHashMap<nsCStringHashKey, int32_t> DecoderVersionTable() {
+  nsTHashMap<nsCStringHashKey, int32_t> decoderVersionTable;
+
+  /*
+   * For the decoders listed here, the benchmark version number will be checked.
+   * If the version number does not exist in the database or is different than
+   * the version number listed here, all the benchmark entries for this decoder
+   * will be erased. An example of assigning the version number `1` for AV1
+   * decoder is:
+   *
+   * decoderVersionTable.InsertOrUpdate("video/av1"_ns, 1);
+   *
+   * For the decoders not listed here the `CheckVersion` method exits early, to
+   * avoid sending unecessary IPC messages.
+   */
+
+  return decoderVersionTable;
+}
+
+/* static */
+void DecoderBenchmark::CheckVersion(const nsACString& aDecoderName) {
+  if (!XRE_IsContentProcess()) {
+    NS_WARNING(
+        "Checking version is only allowed only from the content process.");
+    return;
+  }
+
+  if (!StaticPrefs::media_mediacapabilities_from_database()) {
+    return;
+  }
+
+  nsCString name(aDecoderName);
+  int32_t version;
+  if (!DecoderVersionTable().Get(name, &version)) {
+    // A version is not set for that decoder ignore.
+    return;
+  }
+
+  if (NS_IsMainThread()) {
+    BenchmarkStorageChild::Instance()->SendCheckVersion(name, version);
+    return;
+  }
+
+  DebugOnly<nsresult> rv =
+      GetMainThreadSerialEventTarget()->Dispatch(NS_NewRunnableFunction(
+          "DecoderBenchmark::CheckVersion", [name, version]() {
+            BenchmarkStorageChild::Instance()->SendCheckVersion(name, version);
+          }));
+  MOZ_ASSERT(NS_SUCCEEDED(rv));
+}
+
+}  // namespace mozilla
diff --git a/dom/media/mediacapabilities/DecoderBenchmark.h b/dom/media/mediacapabilities/DecoderBenchmark.h
new file mode 100644
index 0000000000..af730fcef3
--- /dev/null
+++ b/dom/media/mediacapabilities/DecoderBenchmark.h
@@ -0,0 +1,77 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+
+#ifndef MOZILLA_DECODER_BENCHMARK_H
+#define MOZILLA_DECODER_BENCHMARK_H
+
+#include "FrameStatistics.h"
+#include "mozilla/BenchmarkStorageChild.h"
+#include "mozilla/KeyValueStorage.h"
+
+namespace mozilla {
+
+typedef KeyValueStorage::GetPromise BenchmarkScorePromise;
+
+struct DecoderBenchmarkInfo final {
+  const nsCString mContentType;
+  const int32_t mWidth;
+  const int32_t mHeight;
+  const int32_t mFrameRate;
+  const uint32_t mBitDepth;
+};
+
+class DecoderBenchmark final {
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DecoderBenchmark)
+
+ public:
+  void Store(const DecoderBenchmarkInfo& aBenchInfo,
+             RefPtr<FrameStatistics> aStats);
+
+  static RefPtr<BenchmarkScorePromise> Get(
+      const DecoderBenchmarkInfo& aBenchInfo);
+
+  /* For the specific decoder, specified by aDecoderName, it compares the
+   * version number, from a static list of versions, to the version number
+   * found in the database. If those numbers are different all benchmark
+   * entries for that decoder are deleted. */
+  static void CheckVersion(const nsACString& aDecoderName);
+
+ private:
+  void StoreScore(const nsACString& aDecoderName, const nsACString& aKey,
+                  RefPtr<FrameStatistics> aStats);
+
+  RefPtr<BenchmarkScorePromise> GetScore(const nsACString& aDecoderName,
+                                         const nsACString& aKey);
+
+  void Put(const nsACString& aDecoderName, const nsACString& aKey,
+           int32_t aValue);
+
+  RefPtr<BenchmarkScorePromise> Get(const nsACString& aDecoderName,
+                                    const nsACString& aKey);
+  ~DecoderBenchmark() = default;
+
+  // Keep the last TotalFrames and DroppedFrames from FrameStatistics.
+  // FrameStatistics keep an ever-increasing counter across the entire video and
+  // even when there are resolution changes. This code is called whenever there
+  // is a resolution change and we need to calculate the benchmark since the
+  // last call.
+  uint64_t mLastTotalFrames = 0;
+  uint64_t mLastDroppedFrames = 0;
+};
+
+class KeyUtil {
+ public:
+  static nsCString CreateKey(const DecoderBenchmarkInfo& aBenchInfo);
+
+ private:
+  static nsCString BitDepthToStr(uint8_t aBitDepth);
+  static nsCString FindLevel(const uint32_t aLevels[], const size_t length,
+                             uint32_t aValue);
+};
+
+}  // namespace mozilla
+
+#endif  // MOZILLA_DECODER_BENCHMARK_H
diff --git a/dom/media/mediacapabilities/KeyValueStorage.cpp b/dom/media/mediacapabilities/KeyValueStorage.cpp
new file mode 100644
index 0000000000..f0ac0aad7d
--- /dev/null
+++ b/dom/media/mediacapabilities/KeyValueStorage.cpp
@@ -0,0 +1,234 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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 "KeyValueStorage.h"
+
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsDirectoryServiceUtils.h"
+#include "nsServiceManagerUtils.h"
+#include "nsVariant.h"
+
+namespace mozilla {
+
+class DatabaseCallback final : public nsIKeyValueDatabaseCallback {
+ public:
+  NS_DECL_ISUPPORTS
+
+  explicit DatabaseCallback(RefPtr<nsIKeyValueDatabase>& aDatabase)
+      : mDatabase(aDatabase) {}
+  NS_IMETHOD Resolve(nsIKeyValueDatabase* aDatabase) override {
+    if (!aDatabase) {
+      mResultPromise.Reject(NS_ERROR_FAILURE, __func__);
+    }
+    mDatabase = aDatabase;
+    mResultPromise.Resolve(true, __func__);
+    return NS_OK;
+  }
+  NS_IMETHOD Reject(const nsACString&) override {
+    mResultPromise.Reject(NS_ERROR_FAILURE, __func__);
+    return NS_OK;
+  }
+  RefPtr<GenericPromise> Ensure() { return mResultPromise.Ensure(__func__); }
+
+ protected:
+  ~DatabaseCallback() = default;
+  RefPtr<nsIKeyValueDatabase>& mDatabase;
+  MozPromiseHolder<GenericPromise> mResultPromise;
+};
+NS_IMPL_ISUPPORTS(DatabaseCallback, nsIKeyValueDatabaseCallback);
+
+RefPtr<GenericPromise> KeyValueStorage::Init() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(!mDatabaseName.IsEmpty());
+  nsresult rv;
+
+  nsCOMPtr<nsIFile> profileDir;
+  rv = NS_GetSpecialDirectory(NS_APP_USER_PROFILE_50_DIR,
+                              getter_AddRefs(profileDir));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return GenericPromise::CreateAndReject(rv, __func__);
+  }
+  MOZ_ASSERT(profileDir);
+
+  rv = profileDir->AppendNative("mediacapabilities"_ns);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return GenericPromise::CreateAndReject(rv, __func__);
+  }
+
+  rv = profileDir->Create(nsIFile::DIRECTORY_TYPE, 0700);
+  if (rv != NS_ERROR_FILE_ALREADY_EXISTS && NS_WARN_IF(NS_FAILED(rv))) {
+    return GenericPromise::CreateAndReject(rv, __func__);
+  }
+
+  nsCOMPtr<nsIKeyValueService> keyValueService =
+      do_GetService("@mozilla.org/key-value-service;1", &rv);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return GenericPromise::CreateAndReject(rv, __func__);
+  }
+  MOZ_ASSERT(keyValueService);
+
+  auto callback = MakeRefPtr<DatabaseCallback>(mDatabase);
+
+  nsString path;
+  profileDir->GetPath(path);
+  keyValueService->GetOrCreate(callback, NS_ConvertUTF16toUTF8(path),
+                               mDatabaseName);
+  return callback->Ensure();
+}
+
+class VoidCallback final : public nsIKeyValueVoidCallback {
+ public:
+  NS_DECL_ISUPPORTS
+
+  explicit VoidCallback(const RefPtr<KeyValueStorage>& aOwner)
+      : nsIKeyValueVoidCallback(), mOwner(aOwner) {}
+
+  NS_IMETHOD Resolve() override {
+    mResultPromise.Resolve(true, __func__);
+    return NS_OK;
+  }
+  NS_IMETHOD Reject(const nsACString&) override {
+    mResultPromise.Reject(NS_ERROR_FAILURE, __func__);
+    return NS_OK;
+  }
+  RefPtr<GenericPromise> Ensure(const char* aMethodName) {
+    return mResultPromise.Ensure(aMethodName);
+  }
+
+ protected:
+  ~VoidCallback() = default;
+  MozPromiseHolder<GenericPromise> mResultPromise;
+  RefPtr<KeyValueStorage> mOwner;
+};
+NS_IMPL_ISUPPORTS(VoidCallback, nsIKeyValueVoidCallback);
+
+RefPtr<GenericPromise> KeyValueStorage::Put(const nsACString& aKey,
+                                            int32_t aValue) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mDatabase);
+  MOZ_ASSERT(!mDatabaseName.IsEmpty());
+
+  auto value = MakeRefPtr<nsVariant>();
+  nsresult rv = value->SetAsInt32(aValue);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return GenericPromise::CreateAndReject(rv, __func__);
+  }
+
+  auto callback = MakeRefPtr<VoidCallback>(this);
+  rv = mDatabase->Put(callback, aKey, value);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return GenericPromise::CreateAndReject(rv, __func__);
+  }
+  return callback->Ensure(__func__);
+}
+
+RefPtr<GenericPromise> KeyValueStorage::Put(const nsACString& aName,
+                                            const nsACString& aKey,
+                                            int32_t aValue) {
+  if (!mDatabase || !mDatabaseName.Equals(aName)) {
+    mDatabaseName = aName;
+    RefPtr<KeyValueStorage> self = this;
+    const nsCString key(aKey);
+    return Init()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [self, key, aValue](bool) { return self->Put(key, aValue); },
+        [](nsresult rv) {
+          return GenericPromise::CreateAndReject(rv, __func__);
+        });
+  }
+  return Put(aKey, aValue);
+}
+
+class GetValueCallback final : public nsIKeyValueVariantCallback {
+ public:
+  NS_DECL_ISUPPORTS
+
+  NS_IMETHOD Resolve(nsIVariant* aResult) override {
+    int32_t value = 0;
+    Unused << aResult->GetAsInt32(&value);
+    mResultPromise.Resolve(value, __func__);
+    return NS_OK;
+  }
+  NS_IMETHOD Reject(const nsACString&) override {
+    mResultPromise.Reject(NS_ERROR_FAILURE, __func__);
+    return NS_OK;
+  }
+  RefPtr<KeyValueStorage::GetPromise> Ensure() {
+    return mResultPromise.Ensure(__func__);
+  }
+
+ protected:
+  ~GetValueCallback() = default;
+
+ private:
+  MozPromiseHolder<KeyValueStorage::GetPromise> mResultPromise;
+};
+NS_IMPL_ISUPPORTS(GetValueCallback, nsIKeyValueVariantCallback);
+
+RefPtr<KeyValueStorage::GetPromise> KeyValueStorage::Get(
+    const nsACString& aKey) {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mDatabase);
+  MOZ_ASSERT(!mDatabaseName.IsEmpty());
+
+  RefPtr<nsVariant> defaultValue = new nsVariant;
+  nsresult rv = defaultValue->SetAsInt32(-1);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return KeyValueStorage::GetPromise::CreateAndReject(rv, __func__);
+  }
+
+  auto callback = MakeRefPtr<GetValueCallback>();
+  rv = mDatabase->Get(callback, aKey, defaultValue);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return KeyValueStorage::GetPromise::CreateAndReject(rv, __func__);
+  }
+  return callback->Ensure();
+}
+
+RefPtr<KeyValueStorage::GetPromise> KeyValueStorage::Get(
+    const nsACString& aName, const nsACString& aKey) {
+  if (!mDatabase || !mDatabaseName.Equals(aName)) {
+    mDatabaseName = aName;
+    RefPtr<KeyValueStorage> self = this;
+    const nsCString key(aKey);
+    return Init()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [self, key](bool) { return self->Get(key); },
+        [](nsresult rv) {
+          return KeyValueStorage::GetPromise::CreateAndReject(rv, __func__);
+        });
+  }
+  return Get(aKey);
+}
+
+RefPtr<GenericPromise> KeyValueStorage::Clear() {
+  MOZ_ASSERT(NS_IsMainThread());
+  MOZ_ASSERT(mDatabase);
+  MOZ_ASSERT(!mDatabaseName.IsEmpty());
+
+  auto callback = MakeRefPtr<VoidCallback>(this);
+  nsresult rv = mDatabase->Clear(callback);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return GenericPromise::CreateAndReject(rv, __func__);
+  }
+  return callback->Ensure(__func__);
+}
+
+RefPtr<GenericPromise> KeyValueStorage::Clear(const nsACString& aName) {
+  if (!mDatabase || !mDatabaseName.Equals(aName)) {
+    mDatabaseName = aName;
+    RefPtr<KeyValueStorage> self = this;
+    return Init()->Then(
+        GetCurrentSerialEventTarget(), __func__,
+        [self](bool) { return self->Clear(); },
+        [](nsresult rv) {
+          return GenericPromise::CreateAndReject(rv, __func__);
+        });
+  }
+  return Clear();
+}
+
+}  // namespace mozilla
diff --git a/dom/media/mediacapabilities/KeyValueStorage.h b/dom/media/mediacapabilities/KeyValueStorage.h
new file mode 100644
index 0000000000..60d72a6c6d
--- /dev/null
+++ b/dom/media/mediacapabilities/KeyValueStorage.h
@@ -0,0 +1,48 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+
+#ifndef MOZILLA_KEY_VALUE_STORAGE_H
+#define MOZILLA_KEY_VALUE_STORAGE_H
+
+#include "mozilla/MozPromise.h"
+#include "nsIKeyValue.h"
+
+namespace mozilla {
+
+/* A wrapper class around kv store service, which allows storing a pair of key
+ * value permanently. The class must be used from the parent process, where
+ * there is no sandbox because it requires access to the directory that the
+ * database is located. */
+class KeyValueStorage final {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(KeyValueStorage)
+
+  /* Store permanently the value in the Key. */
+  RefPtr<GenericPromise> Put(const nsACString& aName, const nsACString& aKey,
+                             int32_t aValue);
+  /* Get the value stored in the aKey. If the aKey does not exist the promise is
+   * resolved with the value -1. */
+  typedef MozPromise<int32_t, nsresult, true> GetPromise;
+  RefPtr<GetPromise> Get(const nsACString& aName, const nsACString& aKey);
+
+  /* Clear all the key/value pairs from the aName database. */
+  RefPtr<GenericPromise> Clear(const nsACString& aName);
+
+ private:
+  /* Create, if doesn't exist, and initialize the database with a given name. */
+  RefPtr<GenericPromise> Init();
+  RefPtr<GenericPromise> Put(const nsACString& aKey, int32_t aValue);
+  RefPtr<GetPromise> Get(const nsACString& aKey);
+  RefPtr<GenericPromise> Clear();
+  ~KeyValueStorage() = default;
+
+  RefPtr<nsIKeyValueDatabase> mDatabase;
+  nsCString mDatabaseName;
+};
+
+}  // namespace mozilla
+
+#endif  // MOZILLA_KEY_VALUE_STORAGE_H
diff --git a/dom/media/mediacapabilities/MediaCapabilities.cpp b/dom/media/mediacapabilities/MediaCapabilities.cpp
new file mode 100644
index 0000000000..abc83dae4d
--- /dev/null
+++ b/dom/media/mediacapabilities/MediaCapabilities.cpp
@@ -0,0 +1,656 @@
+/* -*- 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 "MediaCapabilities.h"
+
+#include <inttypes.h>
+
+#include <utility>
+
+#include "AllocationPolicy.h"
+#include "Benchmark.h"
+#include "DecoderBenchmark.h"
+#include "DecoderTraits.h"
+#include "MediaInfo.h"
+#include "MediaRecorder.h"
+#include "PDMFactory.h"
+#include "VPXDecoder.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/SchedulerGroup.h"
+#include "mozilla/StaticPrefs_media.h"
+#include "mozilla/TaskQueue.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/DOMMozPromiseRequestHolder.h"
+#include "mozilla/dom/MediaCapabilitiesBinding.h"
+#include "mozilla/dom/MediaSource.h"
+#include "mozilla/dom/Promise.h"
+#include "mozilla/dom/WorkerPrivate.h"
+#include "mozilla/dom/WorkerRef.h"
+#include "mozilla/layers/KnowsCompositor.h"
+#include "nsContentUtils.h"
+#include "WindowRenderer.h"
+
+static mozilla::LazyLogModule sMediaCapabilitiesLog("MediaCapabilities");
+
+#define LOG(msg, ...) \
+  DDMOZ_LOG(sMediaCapabilitiesLog, LogLevel::Debug, msg, ##__VA_ARGS__)
+
+namespace mozilla::dom {
+
+static nsCString VideoConfigurationToStr(const VideoConfiguration* aConfig) {
+  if (!aConfig) {
+    return nsCString();
+  }
+
+  nsCString hdrMetaType(
+      aConfig->mHdrMetadataType.WasPassed()
+          ? HdrMetadataTypeValues::GetString(aConfig->mHdrMetadataType.Value())
+          : "?");
+
+  nsCString colorGamut(
+      aConfig->mColorGamut.WasPassed()
+          ? ColorGamutValues::GetString(aConfig->mColorGamut.Value())
+          : "?");
+
+  nsCString transferFunction(aConfig->mTransferFunction.WasPassed()
+                                 ? TransferFunctionValues::GetString(
+                                       aConfig->mTransferFunction.Value())
+                                 : "?");
+
+  auto str = nsPrintfCString(
+      "[contentType:%s width:%d height:%d bitrate:%" PRIu64
+      " framerate:%lf hasAlphaChannel:%s hdrMetadataType:%s colorGamut:%s "
+      "transferFunction:%s scalabilityMode:%s]",
+      NS_ConvertUTF16toUTF8(aConfig->mContentType).get(), aConfig->mWidth,
+      aConfig->mHeight, aConfig->mBitrate, aConfig->mFramerate,
+      aConfig->mHasAlphaChannel.WasPassed()
+          ? aConfig->mHasAlphaChannel.Value() ? "true" : "false"
+          : "?",
+      hdrMetaType.get(), colorGamut.get(), transferFunction.get(),
+      aConfig->mScalabilityMode.WasPassed()
+          ? NS_ConvertUTF16toUTF8(aConfig->mScalabilityMode.Value()).get()
+          : "?");
+  return std::move(str);
+}
+
+static nsCString AudioConfigurationToStr(const AudioConfiguration* aConfig) {
+  if (!aConfig) {
+    return nsCString();
+  }
+  auto str = nsPrintfCString(
+      "[contentType:%s channels:%s bitrate:%" PRIu64 " samplerate:%d]",
+      NS_ConvertUTF16toUTF8(aConfig->mContentType).get(),
+      aConfig->mChannels.WasPassed()
+          ? NS_ConvertUTF16toUTF8(aConfig->mChannels.Value()).get()
+          : "?",
+      aConfig->mBitrate.WasPassed() ? aConfig->mBitrate.Value() : 0,
+      aConfig->mSamplerate.WasPassed() ? aConfig->mSamplerate.Value() : 0);
+  return std::move(str);
+}
+
+static nsCString MediaCapabilitiesInfoToStr(
+    const MediaCapabilitiesInfo* aInfo) {
+  if (!aInfo) {
+    return nsCString();
+  }
+  auto str = nsPrintfCString("[supported:%s smooth:%s powerEfficient:%s]",
+                             aInfo->Supported() ? "true" : "false",
+                             aInfo->Smooth() ? "true" : "false",
+                             aInfo->PowerEfficient() ? "true" : "false");
+  return std::move(str);
+}
+
+static nsCString MediaDecodingConfigurationToStr(
+    const MediaDecodingConfiguration& aConfig) {
+  nsCString str;
+  str += "["_ns;
+  if (aConfig.mVideo.WasPassed()) {
+    str += "video:"_ns + VideoConfigurationToStr(&aConfig.mVideo.Value());
+    if (aConfig.mAudio.WasPassed()) {
+      str += " "_ns;
+    }
+  }
+  if (aConfig.mAudio.WasPassed()) {
+    str += "audio:"_ns + AudioConfigurationToStr(&aConfig.mAudio.Value());
+  }
+  str += "]"_ns;
+  return str;
+}
+
+MediaCapabilities::MediaCapabilities(nsIGlobalObject* aParent)
+    : mParent(aParent) {}
+
+already_AddRefed<Promise> MediaCapabilities::DecodingInfo(
+    const MediaDecodingConfiguration& aConfiguration, ErrorResult& aRv) {
+  RefPtr<Promise> promise = Promise::Create(mParent, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  // If configuration is not a valid MediaConfiguration, return a Promise
+  // rejected with a TypeError.
+  if (!aConfiguration.mVideo.WasPassed() &&
+      !aConfiguration.mAudio.WasPassed()) {
+    aRv.ThrowTypeError<MSG_MISSING_REQUIRED_DICTIONARY_MEMBER>(
+        "'audio' or 'video' member of argument of "
+        "MediaCapabilities.decodingInfo");
+    return nullptr;
+  }
+
+  LOG("Processing %s", MediaDecodingConfigurationToStr(aConfiguration).get());
+
+  bool supported = true;
+  Maybe<MediaContainerType> videoContainer;
+  Maybe<MediaContainerType> audioContainer;
+
+  // If configuration.video is present and is not a valid video configuration,
+  // return a Promise rejected with a TypeError.
+  if (aConfiguration.mVideo.WasPassed()) {
+    videoContainer = CheckVideoConfiguration(aConfiguration.mVideo.Value());
+    if (!videoContainer) {
+      aRv.ThrowTypeError<MSG_INVALID_MEDIA_VIDEO_CONFIGURATION>();
+      return nullptr;
+    }
+
+    // We have a video configuration and it is valid. Check if it is supported.
+    supported &=
+        aConfiguration.mType == MediaDecodingType::File
+            ? CheckTypeForFile(aConfiguration.mVideo.Value().mContentType)
+            : CheckTypeForMediaSource(
+                  aConfiguration.mVideo.Value().mContentType);
+  }
+  if (aConfiguration.mAudio.WasPassed()) {
+    audioContainer = CheckAudioConfiguration(aConfiguration.mAudio.Value());
+    if (!audioContainer) {
+      aRv.ThrowTypeError<MSG_INVALID_MEDIA_AUDIO_CONFIGURATION>();
+      return nullptr;
+    }
+    // We have an audio configuration and it is valid. Check if it is supported.
+    supported &=
+        aConfiguration.mType == MediaDecodingType::File
+            ? CheckTypeForFile(aConfiguration.mAudio.Value().mContentType)
+            : CheckTypeForMediaSource(
+                  aConfiguration.mAudio.Value().mContentType);
+  }
+
+  if (!supported) {
+    auto info = MakeUnique<MediaCapabilitiesInfo>(
+        false /* supported */, false /* smooth */, false /* power efficient */);
+    LOG("%s -> %s", MediaDecodingConfigurationToStr(aConfiguration).get(),
+        MediaCapabilitiesInfoToStr(info.get()).get());
+    promise->MaybeResolve(std::move(info));
+    return promise.forget();
+  }
+
+  nsTArray<UniquePtr<TrackInfo>> tracks;
+  if (aConfiguration.mVideo.WasPassed()) {
+    MOZ_ASSERT(videoContainer.isSome(), "configuration is valid and supported");
+    auto videoTracks = DecoderTraits::GetTracksInfo(*videoContainer);
+    // If the MIME type does not imply a codec, the string MUST
+    // also have one and only one parameter that is named codecs with a value
+    // describing a single media codec. Otherwise, it MUST contain no
+    // parameters.
+    if (videoTracks.Length() != 1) {
+      promise->MaybeRejectWithTypeError<MSG_NO_CODECS_PARAMETER>(
+          videoContainer->OriginalString());
+      return promise.forget();
+    }
+    MOZ_DIAGNOSTIC_ASSERT(videoTracks.ElementAt(0),
+                          "must contain a valid trackinfo");
+    // If the type refers to an audio codec, reject now.
+    if (videoTracks[0]->GetType() != TrackInfo::kVideoTrack) {
+      promise
+          ->MaybeRejectWithTypeError<MSG_INVALID_MEDIA_VIDEO_CONFIGURATION>();
+      return promise.forget();
+    }
+    tracks.AppendElements(std::move(videoTracks));
+  }
+  if (aConfiguration.mAudio.WasPassed()) {
+    MOZ_ASSERT(audioContainer.isSome(), "configuration is valid and supported");
+    auto audioTracks = DecoderTraits::GetTracksInfo(*audioContainer);
+    // If the MIME type does not imply a codec, the string MUST
+    // also have one and only one parameter that is named codecs with a value
+    // describing a single media codec. Otherwise, it MUST contain no
+    // parameters.
+    if (audioTracks.Length() != 1) {
+      promise->MaybeRejectWithTypeError<MSG_NO_CODECS_PARAMETER>(
+          audioContainer->OriginalString());
+      return promise.forget();
+    }
+    MOZ_DIAGNOSTIC_ASSERT(audioTracks.ElementAt(0),
+                          "must contain a valid trackinfo");
+    // If the type refers to a video codec, reject now.
+    if (audioTracks[0]->GetType() != TrackInfo::kAudioTrack) {
+      promise
+          ->MaybeRejectWithTypeError<MSG_INVALID_MEDIA_AUDIO_CONFIGURATION>();
+      return promise.forget();
+    }
+    tracks.AppendElements(std::move(audioTracks));
+  }
+
+  using CapabilitiesPromise = MozPromise<MediaCapabilitiesInfo, MediaResult,
+                                         /* IsExclusive = */ true>;
+  nsTArray<RefPtr<CapabilitiesPromise>> promises;
+
+  RefPtr<TaskQueue> taskQueue =
+      TaskQueue::Create(GetMediaThreadPool(MediaThreadType::PLATFORM_DECODER),
+                        "MediaCapabilities::TaskQueue");
+  for (auto&& config : tracks) {
+    TrackInfo::TrackType type =
+        config->IsVideo() ? TrackInfo::kVideoTrack : TrackInfo::kAudioTrack;
+
+    MOZ_ASSERT(type == TrackInfo::kAudioTrack ||
+                   videoContainer->ExtendedType().GetFramerate().isSome(),
+               "framerate is a required member of VideoConfiguration");
+
+    if (type == TrackInfo::kAudioTrack) {
+      // There's no need to create an audio decoder has we only want to know if
+      // such codec is supported. We do need to call the PDMFactory::Supports
+      // API outside the main thread to get accurate results.
+      promises.AppendElement(
+          InvokeAsync(taskQueue, __func__, [config = std::move(config)]() {
+            RefPtr<PDMFactory> pdm = new PDMFactory();
+            SupportDecoderParams params{*config};
+            if (pdm->Supports(params, nullptr /* decoder doctor */).isEmpty()) {
+              return CapabilitiesPromise::CreateAndReject(NS_ERROR_FAILURE,
+                                                          __func__);
+            }
+            return CapabilitiesPromise::CreateAndResolve(
+                MediaCapabilitiesInfo(true /* supported */, true /* smooth */,
+                                      true /* power efficient */),
+                __func__);
+          }));
+      continue;
+    }
+
+    // On Windows, the MediaDataDecoder expects to be created on a thread
+    // supporting MTA, which the main thread doesn't. So we use our task queue
+    // to create such decoder and perform initialization.
+
+    RefPtr<layers::KnowsCompositor> compositor = GetCompositor();
+    float frameRate =
+        static_cast<float>(videoContainer->ExtendedType().GetFramerate().ref());
+    const bool shouldResistFingerprinting =
+        mParent->ShouldResistFingerprinting(RFPTarget::MediaCapabilities);
+
+    // clang-format off
+    promises.AppendElement(InvokeAsync(
+        taskQueue, __func__,
+        [taskQueue, frameRate, shouldResistFingerprinting, compositor,
+         config = std::move(config)]() mutable -> RefPtr<CapabilitiesPromise> {
+          // MediaDataDecoder keeps a reference to the config object, so we must
+          // keep it alive until the decoder has been shutdown.
+          static Atomic<uint32_t> sTrackingIdCounter(0);
+          TrackingId trackingId(TrackingId::Source::MediaCapabilities,
+                                sTrackingIdCounter++,
+                                TrackingId::TrackAcrossProcesses::Yes);
+          CreateDecoderParams params{
+              *config, compositor,
+              CreateDecoderParams::VideoFrameRate(frameRate),
+              TrackInfo::kVideoTrack, Some(std::move(trackingId))};
+          // We want to ensure that all decoder's queries are occurring only
+          // once at a time as it can quickly exhaust the system resources
+          // otherwise.
+          static RefPtr<AllocPolicy> sVideoAllocPolicy = [&taskQueue]() {
+            SchedulerGroup::Dispatch(
+                NS_NewRunnableFunction(
+                    "MediaCapabilities::AllocPolicy:Video", []() {
+                      ClearOnShutdown(&sVideoAllocPolicy,
+                                      ShutdownPhase::XPCOMShutdownThreads);
+                    }));
+            return new SingleAllocPolicy(TrackInfo::TrackType::kVideoTrack,
+                                         taskQueue);
+          }();
+          return AllocationWrapper::CreateDecoder(params, sVideoAllocPolicy)
+              ->Then(
+                  taskQueue, __func__,
+                  [taskQueue, frameRate, shouldResistFingerprinting,
+                   config = std::move(config)](
+                      AllocationWrapper::AllocateDecoderPromise::
+                          ResolveOrRejectValue&& aValue) mutable {
+                    if (aValue.IsReject()) {
+                      return CapabilitiesPromise::CreateAndReject(
+                          std::move(aValue.RejectValue()), __func__);
+                    }
+                    RefPtr<MediaDataDecoder> decoder =
+                        std::move(aValue.ResolveValue());
+                    // We now query the decoder to determine if it's power
+                    // efficient.
+                    RefPtr<CapabilitiesPromise> p = decoder->Init()->Then(
+                        taskQueue, __func__,
+                        [taskQueue, decoder, frameRate,
+                         shouldResistFingerprinting,
+                         config = std::move(config)](
+                            MediaDataDecoder::InitPromise::
+                                ResolveOrRejectValue&& aValue) mutable {
+                          RefPtr<CapabilitiesPromise> p;
+                          if (aValue.IsReject()) {
+                            p = CapabilitiesPromise::CreateAndReject(
+                                std::move(aValue.RejectValue()), __func__);
+                          } else if (shouldResistFingerprinting) {
+                            p = CapabilitiesPromise::CreateAndResolve(
+                                MediaCapabilitiesInfo(true /* supported */,
+                                true /* smooth */, false /* power efficient */),
+                                __func__);
+                          } else {
+                            MOZ_ASSERT(config->IsVideo());
+                            if (StaticPrefs::media_mediacapabilities_from_database()) {
+                              nsAutoCString reason;
+                              bool powerEfficient =
+                                  decoder->IsHardwareAccelerated(reason);
+
+                              int32_t videoFrameRate = std::clamp<int32_t>(frameRate, 1, INT32_MAX);
+
+                              DecoderBenchmarkInfo benchmarkInfo{
+                                  config->mMimeType,
+                                  config->GetAsVideoInfo()->mImage.width,
+                                  config->GetAsVideoInfo()->mImage.height,
+                                  videoFrameRate, 8};
+
+                              p = DecoderBenchmark::Get(benchmarkInfo)->Then(
+                                  GetMainThreadSerialEventTarget(),
+                                  __func__,
+                                  [powerEfficient](int32_t score) {
+                                    // score < 0 means no entry found.
+                                    bool smooth = score < 0 || score >
+                                      StaticPrefs::
+                                        media_mediacapabilities_drop_threshold();
+                                    return CapabilitiesPromise::
+                                        CreateAndResolve(
+                                            MediaCapabilitiesInfo(
+                                                true, smooth,
+                                                powerEfficient),
+                                            __func__);
+                                  },
+                                  [](nsresult rv) {
+                                    return CapabilitiesPromise::
+                                        CreateAndReject(rv, __func__);
+                                  });
+                            } else if (config->GetAsVideoInfo()->mImage.height < 480) {
+                              // Assume that we can do stuff at 480p or less in
+                              // a power efficient manner and smoothly. If
+                              // greater than 480p we assume that if the video
+                              // decoding is hardware accelerated it will be
+                              // smooth and power efficient, otherwise we use
+                              // the benchmark to estimate
+                              p = CapabilitiesPromise::CreateAndResolve(
+                                  MediaCapabilitiesInfo(true, true, true),
+                                  __func__);
+                            } else {
+                              nsAutoCString reason;
+                              bool smooth = true;
+                              bool powerEfficient =
+                                  decoder->IsHardwareAccelerated(reason);
+                              if (!powerEfficient &&
+                                  VPXDecoder::IsVP9(config->mMimeType)) {
+                                smooth = VP9Benchmark::IsVP9DecodeFast(
+                                    true /* default */);
+                                uint32_t fps =
+                                    VP9Benchmark::MediaBenchmarkVp9Fps();
+                                if (!smooth && fps > 0) {
+                                  // The VP9 estimizer decode a 1280x720 video.
+                                  // Let's adjust the result for the resolution
+                                  // and frame rate of what we actually want. If
+                                  // the result is twice that we need we assume
+                                  // it will be smooth.
+                                  const auto& videoConfig =
+                                      *config->GetAsVideoInfo();
+                                  double needed = ((1280.0 * 720.0) /
+                                                   (videoConfig.mImage.width *
+                                                    videoConfig.mImage.height) *
+                                                   fps) /
+                                                  frameRate;
+                                  smooth = needed > 2;
+                                }
+                              }
+
+                              p = CapabilitiesPromise::CreateAndResolve(
+                                  MediaCapabilitiesInfo(true /* supported */,
+                                                        smooth, powerEfficient),
+                                  __func__);
+                            }
+                          }
+                          MOZ_ASSERT(p.get(), "the promise has been created");
+                          // Let's keep alive the decoder and the config object
+                          // until the decoder has shutdown.
+                          decoder->Shutdown()->Then(
+                              taskQueue, __func__,
+                              [taskQueue, decoder, config = std::move(config)](
+                                  const ShutdownPromise::ResolveOrRejectValue&
+                                      aValue) {});
+                          return p;
+                        });
+                    return p;
+                  });
+        }));
+    // clang-format on
+  }
+
+  auto holder = MakeRefPtr<
+      DOMMozPromiseRequestHolder<CapabilitiesPromise::AllPromiseType>>(mParent);
+  RefPtr<nsISerialEventTarget> targetThread;
+  RefPtr<StrongWorkerRef> workerRef;
+
+  if (NS_IsMainThread()) {
+    targetThread = GetMainThreadSerialEventTarget();
+  } else {
+    WorkerPrivate* wp = GetCurrentThreadWorkerPrivate();
+    MOZ_ASSERT(wp, "Must be called from a worker thread");
+    targetThread = wp->HybridEventTarget();
+    workerRef = StrongWorkerRef::Create(
+        wp, "MediaCapabilities", [holder, targetThread]() {
+          MOZ_ASSERT(targetThread->IsOnCurrentThread());
+          holder->DisconnectIfExists();
+        });
+    if (NS_WARN_IF(!workerRef)) {
+      // The worker is shutting down.
+      aRv.Throw(NS_ERROR_FAILURE);
+      return nullptr;
+    }
+  }
+
+  MOZ_ASSERT(targetThread);
+
+  // this is only captured for use with the LOG macro.
+  RefPtr<MediaCapabilities> self = this;
+
+  CapabilitiesPromise::All(targetThread, promises)
+      ->Then(targetThread, __func__,
+             [promise, tracks = std::move(tracks), workerRef, holder,
+              aConfiguration, self,
+              this](CapabilitiesPromise::AllPromiseType::ResolveOrRejectValue&&
+                        aValue) {
+               holder->Complete();
+               if (aValue.IsReject()) {
+                 auto info = MakeUnique<MediaCapabilitiesInfo>(
+                     false /* supported */, false /* smooth */,
+                     false /* power efficient */);
+                 LOG("%s -> %s",
+                     MediaDecodingConfigurationToStr(aConfiguration).get(),
+                     MediaCapabilitiesInfoToStr(info.get()).get());
+                 promise->MaybeResolve(std::move(info));
+                 return;
+               }
+               bool powerEfficient = true;
+               bool smooth = true;
+               for (auto&& capability : aValue.ResolveValue()) {
+                 smooth &= capability.Smooth();
+                 powerEfficient &= capability.PowerEfficient();
+               }
+               auto info = MakeUnique<MediaCapabilitiesInfo>(
+                   true /* supported */, smooth, powerEfficient);
+               LOG("%s -> %s",
+                   MediaDecodingConfigurationToStr(aConfiguration).get(),
+                   MediaCapabilitiesInfoToStr(info.get()).get());
+               promise->MaybeResolve(std::move(info));
+             })
+      ->Track(*holder);
+
+  return promise.forget();
+}
+
+already_AddRefed<Promise> MediaCapabilities::EncodingInfo(
+    const MediaEncodingConfiguration& aConfiguration, ErrorResult& aRv) {
+  RefPtr<Promise> promise = Promise::Create(mParent, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  // If configuration is not a valid MediaConfiguration, return a Promise
+  // rejected with a TypeError.
+  if (!aConfiguration.mVideo.WasPassed() &&
+      !aConfiguration.mAudio.WasPassed()) {
+    aRv.ThrowTypeError<MSG_MISSING_REQUIRED_DICTIONARY_MEMBER>(
+        "'audio' or 'video' member of argument of "
+        "MediaCapabilities.encodingInfo");
+    return nullptr;
+  }
+
+  bool supported = true;
+
+  // If configuration.video is present and is not a valid video configuration,
+  // return a Promise rejected with a TypeError.
+  if (aConfiguration.mVideo.WasPassed()) {
+    if (!CheckVideoConfiguration(aConfiguration.mVideo.Value())) {
+      aRv.ThrowTypeError<MSG_INVALID_MEDIA_VIDEO_CONFIGURATION>();
+      return nullptr;
+    }
+    // We have a video configuration and it is valid. Check if it is supported.
+    supported &=
+        CheckTypeForEncoder(aConfiguration.mVideo.Value().mContentType);
+  }
+  if (aConfiguration.mAudio.WasPassed()) {
+    if (!CheckAudioConfiguration(aConfiguration.mAudio.Value())) {
+      aRv.ThrowTypeError<MSG_INVALID_MEDIA_AUDIO_CONFIGURATION>();
+      return nullptr;
+    }
+    // We have an audio configuration and it is valid. Check if it is supported.
+    supported &=
+        CheckTypeForEncoder(aConfiguration.mAudio.Value().mContentType);
+  }
+
+  auto info = MakeUnique<MediaCapabilitiesInfo>(supported, supported, false);
+  promise->MaybeResolve(std::move(info));
+
+  return promise.forget();
+}
+
+Maybe<MediaContainerType> MediaCapabilities::CheckVideoConfiguration(
+    const VideoConfiguration& aConfig) const {
+  Maybe<MediaExtendedMIMEType> container = MakeMediaExtendedMIMEType(aConfig);
+  if (!container) {
+    return Nothing();
+  }
+  // A valid video MIME type is a string that is a valid media MIME type and for
+  // which the type per [RFC7231] is either video or application.
+  if (!container->Type().HasVideoMajorType() &&
+      !container->Type().HasApplicationMajorType()) {
+    return Nothing();
+  }
+
+  // If the MIME type does not imply a codec, the string MUST also have one and
+  // only one parameter that is named codecs with a value describing a single
+  // media codec. Otherwise, it MUST contain no parameters.
+  // TODO (nsIMOMEHeaderParam doesn't provide backend to count number of
+  // parameters)
+
+  return Some(MediaContainerType(std::move(*container)));
+}
+
+Maybe<MediaContainerType> MediaCapabilities::CheckAudioConfiguration(
+    const AudioConfiguration& aConfig) const {
+  Maybe<MediaExtendedMIMEType> container = MakeMediaExtendedMIMEType(aConfig);
+  if (!container) {
+    return Nothing();
+  }
+  // A valid audio MIME type is a string that is valid media MIME type and for
+  // which the type per [RFC7231] is either audio or application.
+  if (!container->Type().HasAudioMajorType() &&
+      !container->Type().HasApplicationMajorType()) {
+    return Nothing();
+  }
+
+  // If the MIME type does not imply a codec, the string MUST also have one and
+  // only one parameter that is named codecs with a value describing a single
+  // media codec. Otherwise, it MUST contain no parameters.
+  // TODO (nsIMOMEHeaderParam doesn't provide backend to count number of
+  // parameters)
+
+  return Some(MediaContainerType(std::move(*container)));
+}
+
+bool MediaCapabilities::CheckTypeForMediaSource(const nsAString& aType) {
+  IgnoredErrorResult rv;
+  MediaSource::IsTypeSupported(aType, nullptr /* DecoderDoctorDiagnostics */,
+                               rv);
+
+  return !rv.Failed();
+}
+
+bool MediaCapabilities::CheckTypeForFile(const nsAString& aType) {
+  Maybe<MediaContainerType> containerType = MakeMediaContainerType(aType);
+  if (!containerType) {
+    return false;
+  }
+
+  return DecoderTraits::CanHandleContainerType(
+             *containerType, nullptr /* DecoderDoctorDiagnostics */) !=
+         CANPLAY_NO;
+}
+
+bool MediaCapabilities::CheckTypeForEncoder(const nsAString& aType) {
+  return MediaRecorder::IsTypeSupported(aType);
+}
+
+already_AddRefed<layers::KnowsCompositor> MediaCapabilities::GetCompositor() {
+  nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(GetParentObject());
+  if (NS_WARN_IF(!window)) {
+    return nullptr;
+  }
+
+  nsCOMPtr<Document> doc = window->GetExtantDoc();
+  if (NS_WARN_IF(!doc)) {
+    return nullptr;
+  }
+  WindowRenderer* renderer = nsContentUtils::WindowRendererForDocument(doc);
+  if (NS_WARN_IF(!renderer)) {
+    return nullptr;
+  }
+  RefPtr<layers::KnowsCompositor> knows = renderer->AsKnowsCompositor();
+  if (NS_WARN_IF(!knows)) {
+    return nullptr;
+  }
+  return knows->GetForMedia().forget();
+}
+
+bool MediaCapabilities::Enabled(JSContext* aCx, JSObject* aGlobal) {
+  return StaticPrefs::media_media_capabilities_enabled();
+}
+
+JSObject* MediaCapabilities::WrapObject(JSContext* aCx,
+                                        JS::Handle<JSObject*> aGivenProto) {
+  return MediaCapabilities_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MediaCapabilities)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(MediaCapabilities)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(MediaCapabilities)
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(MediaCapabilities, mParent)
+
+// MediaCapabilitiesInfo
+bool MediaCapabilitiesInfo::WrapObject(
+    JSContext* aCx, JS::Handle<JSObject*> aGivenProto,
+    JS::MutableHandle<JSObject*> aReflector) {
+  return MediaCapabilitiesInfo_Binding::Wrap(aCx, this, aGivenProto,
+                                             aReflector);
+}
+
+}  // namespace mozilla::dom
diff --git a/dom/media/mediacapabilities/MediaCapabilities.h b/dom/media/mediacapabilities/MediaCapabilities.h
new file mode 100644
index 0000000000..b31e12e8ab
--- /dev/null
+++ b/dom/media/mediacapabilities/MediaCapabilities.h
@@ -0,0 +1,104 @@
+/* -*- 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/. */
+
+#ifndef mozilla_dom_MediaCapabilities_h_
+#define mozilla_dom_MediaCapabilities_h_
+
+#include "DDLoggedTypeTraits.h"
+#include "js/TypeDecls.h"
+#include "mozilla/AlreadyAddRefed.h"
+#include "mozilla/Assertions.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/dom/NonRefcountedDOMObject.h"
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsISupports.h"
+#include "nsStringFwd.h"
+#include "nsWrapperCache.h"
+
+class nsIGlobalObject;
+
+namespace mozilla {
+class ErrorResult;
+class MediaContainerType;
+
+namespace layers {
+class KnowsCompositor;
+}
+namespace dom {
+class MediaCapabilities;
+}  // namespace dom
+DDLoggedTypeName(dom::MediaCapabilities);
+
+namespace dom {
+
+struct MediaDecodingConfiguration;
+struct MediaEncodingConfiguration;
+struct AudioConfiguration;
+struct VideoConfiguration;
+class Promise;
+
+class MediaCapabilities final : public nsISupports, public nsWrapperCache {
+ public:
+  // Ref counting and cycle collection
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(MediaCapabilities)
+
+  // WebIDL Methods
+  already_AddRefed<Promise> DecodingInfo(
+      const MediaDecodingConfiguration& aConfiguration, ErrorResult& aRv);
+  already_AddRefed<Promise> EncodingInfo(
+      const MediaEncodingConfiguration& aConfiguration, ErrorResult& aRv);
+  // End WebIDL Methods
+
+  explicit MediaCapabilities(nsIGlobalObject* aParent);
+
+  nsIGlobalObject* GetParentObject() const { return mParent; }
+  JSObject* WrapObject(JSContext* aCx,
+                       JS::Handle<JSObject*> aGivenProto) override;
+
+  static bool Enabled(JSContext* aCx, JSObject* aGlobal);
+
+ private:
+  virtual ~MediaCapabilities() = default;
+  Maybe<MediaContainerType> CheckVideoConfiguration(
+      const VideoConfiguration& aConfig) const;
+  Maybe<MediaContainerType> CheckAudioConfiguration(
+      const AudioConfiguration& aConfig) const;
+  bool CheckTypeForMediaSource(const nsAString& aType);
+  bool CheckTypeForFile(const nsAString& aType);
+  bool CheckTypeForEncoder(const nsAString& aType);
+  already_AddRefed<layers::KnowsCompositor> GetCompositor();
+  nsCOMPtr<nsIGlobalObject> mParent;
+};
+
+class MediaCapabilitiesInfo final : public NonRefcountedDOMObject {
+ public:
+  // WebIDL methods
+  bool Supported() const { return mSupported; }
+  bool Smooth() const { return mSmooth; }
+  bool PowerEfficient() const { return mPowerEfficient; }
+  // End WebIDL methods
+
+  MediaCapabilitiesInfo(bool aSupported, bool aSmooth, bool aPowerEfficient)
+      : mSupported(aSupported),
+        mSmooth(aSmooth),
+        mPowerEfficient(aPowerEfficient) {}
+
+  bool WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto,
+                  JS::MutableHandle<JSObject*> aReflector);
+
+ private:
+  bool mSupported;
+  bool mSmooth;
+  bool mPowerEfficient;
+};
+
+}  // namespace dom
+
+}  // namespace mozilla
+
+#endif /* mozilla_dom_MediaCapabilities_h_ */
diff --git a/dom/media/mediacapabilities/PBenchmarkStorage.ipdl b/dom/media/mediacapabilities/PBenchmarkStorage.ipdl
new file mode 100644
index 0000000000..220d83f978
--- /dev/null
+++ b/dom/media/mediacapabilities/PBenchmarkStorage.ipdl
@@ -0,0 +1,23 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 protocol PContent;
+
+namespace mozilla {
+
+[ManualDealloc]
+async protocol PBenchmarkStorage
+{
+  manager PContent;
+
+parent:
+  async Put(nsCString aDbName, nsCString aKey, int32_t aValue);
+  async Get(nsCString aDbName, nsCString aKey) returns(int32_t aValue);
+  async CheckVersion(nsCString aDbName, int32_t aVersion);
+  async __delete__();
+
+};
+
+} // namespace mozilla
diff --git a/dom/media/mediacapabilities/moz.build b/dom/media/mediacapabilities/moz.build
new file mode 100644
index 0000000000..bafd3de59c
--- /dev/null
+++ b/dom/media/mediacapabilities/moz.build
@@ -0,0 +1,32 @@
+# vim: set filetype=python:
+# 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/.
+
+EXPORTS.mozilla.dom += [
+    "MediaCapabilities.h",
+]
+
+EXPORTS.mozilla += [
+    "BenchmarkStorageChild.h",
+    "BenchmarkStorageParent.h",
+    "KeyValueStorage.h",
+]
+
+EXPORTS += [
+    "DecoderBenchmark.h",
+]
+
+UNIFIED_SOURCES += [
+    "BenchmarkStorageChild.cpp",
+    "BenchmarkStorageParent.cpp",
+    "DecoderBenchmark.cpp",
+    "KeyValueStorage.cpp",
+    "MediaCapabilities.cpp",
+]
+
+IPDL_SOURCES += ["PBenchmarkStorage.ipdl"]
+
+include("/ipc/chromium/chromium-config.mozbuild")
+
+FINAL_LIBRARY = "xul"