1 files changed, 297 insertions, 0 deletions
diff --git a/dom/media/ipc/RemoteDecoderChild.cpp b/dom/media/ipc/RemoteDecoderChild.cpp
new file mode 100644
index 0000000000..d20856f667
--- /dev/null
+++ b/dom/media/ipc/RemoteDecoderChild.cpp
@@ -0,0 +1,297 @@
+/* -*- 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 "RemoteDecoderChild.h"
+
+#include "RemoteDecoderManagerChild.h"
+
+#include "mozilla/RemoteDecodeUtils.h"
+
+namespace mozilla {
+
+RemoteDecoderChild::RemoteDecoderChild(RemoteDecodeIn aLocation)
+    : ShmemRecycleAllocator(this),
+      mLocation(aLocation),
+      mThread(GetCurrentSerialEventTarget()) {
+  MOZ_DIAGNOSTIC_ASSERT(
+      RemoteDecoderManagerChild::GetManagerThread() &&
+          RemoteDecoderManagerChild::GetManagerThread()->IsOnCurrentThread(),
+      "Must be created on the manager thread");
+}
+
+RemoteDecoderChild::~RemoteDecoderChild() = default;
+
+void RemoteDecoderChild::HandleRejectionError(
+    const ipc::ResponseRejectReason& aReason,
+    std::function<void(const MediaResult&)>&& aCallback) {
+  // If the channel goes down and CanSend() returns false, the IPDL promise will
+  // be rejected with SendError rather than ActorDestroyed. Both means the same
+  // thing and we can consider that the parent has crashed. The child can no
+  // longer be used.
+  //
+
+  // The GPU/RDD process crashed.
+  if (mLocation == RemoteDecodeIn::GpuProcess) {
+    // The GPU process will get automatically restarted by the parent process.
+    // Once it has been restarted the ContentChild will receive the message and
+    // will call GetManager()->InitForGPUProcess.
+    // We defer reporting an error until we've recreated the RemoteDecoder
+    // manager so that it'll be safe for MediaFormatReader to recreate decoders
+    RefPtr<RemoteDecoderChild> self = this;
+    GetManager()->RunWhenGPUProcessRecreated(NS_NewRunnableFunction(
+        "RemoteDecoderChild::HandleRejectionError",
+        [self, callback = std::move(aCallback)]() {
+          MediaResult error(
+              NS_ERROR_DOM_MEDIA_REMOTE_DECODER_CRASHED_RDD_OR_GPU_ERR,
+              __func__);
+          callback(error);
+        }));
+    return;
+  }
+
+  nsresult err = ((mLocation == RemoteDecodeIn::GpuProcess) ||
+                  (mLocation == RemoteDecodeIn::RddProcess))
+                     ? NS_ERROR_DOM_MEDIA_REMOTE_DECODER_CRASHED_RDD_OR_GPU_ERR
+                     : NS_ERROR_DOM_MEDIA_REMOTE_DECODER_CRASHED_UTILITY_ERR;
+  // The RDD process is restarted on demand and asynchronously, we can
+  // immediately inform the caller that a new decoder is needed. The RDD will
+  // then be restarted during the new decoder creation by
+  aCallback(MediaResult(err, __func__));
+}
+
+// ActorDestroy is called if the channel goes down while waiting for a response.
+void RemoteDecoderChild::ActorDestroy(ActorDestroyReason aWhy) {
+  mRemoteDecoderCrashed = (aWhy == AbnormalShutdown);
+  mDecodedData.Clear();
+  CleanupShmemRecycleAllocator();
+  RecordShutdownTelemetry(mRemoteDecoderCrashed);
+}
+
+void RemoteDecoderChild::DestroyIPDL() {
+  AssertOnManagerThread();
+  MOZ_DIAGNOSTIC_ASSERT(mInitPromise.IsEmpty() && mDecodePromise.IsEmpty() &&
+                            mDrainPromise.IsEmpty() &&
+                            mFlushPromise.IsEmpty() &&
+                            mShutdownPromise.IsEmpty(),
+                        "All promises should have been rejected");
+  if (CanSend()) {
+    PRemoteDecoderChild::Send__delete__(this);
+  }
+}
+
+void RemoteDecoderChild::IPDLActorDestroyed() { mIPDLSelfRef = nullptr; }
+
+// MediaDataDecoder methods
+
+RefPtr<MediaDataDecoder::InitPromise> RemoteDecoderChild::Init() {
+  AssertOnManagerThread();
+
+  mRemoteDecoderCrashed = false;
+
+  RefPtr<RemoteDecoderChild> self = this;
+  SendInit()
+      ->Then(
+          mThread, __func__,
+          [self, this](InitResultIPDL&& aResponse) {
+            mInitPromiseRequest.Complete();
+            if (aResponse.type() == InitResultIPDL::TMediaResult) {
+              mInitPromise.Reject(aResponse.get_MediaResult(), __func__);
+              return;
+            }
+            const auto& initResponse = aResponse.get_InitCompletionIPDL();
+            mDescription = initResponse.decoderDescription();
+            mDescription.Append(" (");
+            mDescription.Append(RemoteDecodeInToStr(GetManager()->Location()));
+            mDescription.Append(" remote)");
+
+            mIsHardwareAccelerated = initResponse.hardware();
+            mHardwareAcceleratedReason = initResponse.hardwareReason();
+            mConversion = initResponse.conversion();
+            // Either the promise has not yet been resolved or the handler has
+            // been disconnected and we can't get here.
+            mInitPromise.Resolve(initResponse.type(), __func__);
+          },
+          [self](const mozilla::ipc::ResponseRejectReason& aReason) {
+            self->mInitPromiseRequest.Complete();
+            self->HandleRejectionError(
+                aReason, [self](const MediaResult& aError) {
+                  self->mInitPromise.RejectIfExists(aError, __func__);
+                });
+          })
+      ->Track(mInitPromiseRequest);
+
+  return mInitPromise.Ensure(__func__);
+}
+
+RefPtr<MediaDataDecoder::DecodePromise> RemoteDecoderChild::Decode(
+    const nsTArray<RefPtr<MediaRawData>>& aSamples) {
+  AssertOnManagerThread();
+
+  if (mRemoteDecoderCrashed) {
+    nsresult err =
+        ((mLocation == RemoteDecodeIn::GpuProcess) ||
+         (mLocation == RemoteDecodeIn::RddProcess))
+            ? NS_ERROR_DOM_MEDIA_REMOTE_DECODER_CRASHED_RDD_OR_GPU_ERR
+            : NS_ERROR_DOM_MEDIA_REMOTE_DECODER_CRASHED_UTILITY_ERR;
+    return MediaDataDecoder::DecodePromise::CreateAndReject(err, __func__);
+  }
+
+  auto samples = MakeRefPtr<ArrayOfRemoteMediaRawData>();
+  if (!samples->Fill(aSamples,
+                     [&](size_t aSize) { return AllocateBuffer(aSize); })) {
+    return MediaDataDecoder::DecodePromise::CreateAndReject(
+        NS_ERROR_OUT_OF_MEMORY, __func__);
+  }
+  SendDecode(samples)->Then(
+      mThread, __func__,
+      [self = RefPtr{this}, this](
+          PRemoteDecoderChild::DecodePromise::ResolveOrRejectValue&& aValue) {
+        // We no longer need the samples as the data has been
+        // processed by the parent.
+        // If the parent died, the error being fatal will cause the
+        // decoder to be torn down and all shmem in the pool will be
+        // deallocated.
+        ReleaseAllBuffers();
+
+        if (aValue.IsReject()) {
+          HandleRejectionError(
+              aValue.RejectValue(), [self](const MediaResult& aError) {
+                self->mDecodePromise.RejectIfExists(aError, __func__);
+              });
+          return;
+        }
+        MOZ_DIAGNOSTIC_ASSERT(CanSend(),
+                              "The parent unexpectedly died, promise should "
+                              "have been rejected first");
+        if (mDecodePromise.IsEmpty()) {
+          // We got flushed.
+          return;
+        }
+        auto response = std::move(aValue.ResolveValue());
+        if (response.type() == DecodeResultIPDL::TMediaResult &&
+            NS_FAILED(response.get_MediaResult())) {
+          mDecodePromise.Reject(response.get_MediaResult(), __func__);
+          return;
+        }
+        if (response.type() == DecodeResultIPDL::TDecodedOutputIPDL) {
+          ProcessOutput(std::move(response.get_DecodedOutputIPDL()));
+        }
+        mDecodePromise.Resolve(std::move(mDecodedData), __func__);
+        mDecodedData = MediaDataDecoder::DecodedData();
+      });
+
+  return mDecodePromise.Ensure(__func__);
+}
+
+RefPtr<MediaDataDecoder::FlushPromise> RemoteDecoderChild::Flush() {
+  AssertOnManagerThread();
+  mDecodePromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
+  mDrainPromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
+
+  RefPtr<RemoteDecoderChild> self = this;
+  SendFlush()->Then(
+      mThread, __func__,
+      [self](const MediaResult& aResult) {
+        if (NS_SUCCEEDED(aResult)) {
+          self->mFlushPromise.ResolveIfExists(true, __func__);
+        } else {
+          self->mFlushPromise.RejectIfExists(aResult, __func__);
+        }
+      },
+      [self](const mozilla::ipc::ResponseRejectReason& aReason) {
+        self->HandleRejectionError(aReason, [self](const MediaResult& aError) {
+          self->mFlushPromise.RejectIfExists(aError, __func__);
+        });
+      });
+  return mFlushPromise.Ensure(__func__);
+}
+
+RefPtr<MediaDataDecoder::DecodePromise> RemoteDecoderChild::Drain() {
+  AssertOnManagerThread();
+
+  RefPtr<RemoteDecoderChild> self = this;
+  SendDrain()->Then(
+      mThread, __func__,
+      [self, this](DecodeResultIPDL&& aResponse) {
+        if (mDrainPromise.IsEmpty()) {
+          // We got flushed.
+          return;
+        }
+        if (aResponse.type() == DecodeResultIPDL::TMediaResult &&
+            NS_FAILED(aResponse.get_MediaResult())) {
+          mDrainPromise.Reject(aResponse.get_MediaResult(), __func__);
+          return;
+        }
+        MOZ_DIAGNOSTIC_ASSERT(CanSend(),
+                              "The parent unexpectedly died, promise should "
+                              "have been rejected first");
+        if (aResponse.type() == DecodeResultIPDL::TDecodedOutputIPDL) {
+          ProcessOutput(std::move(aResponse.get_DecodedOutputIPDL()));
+        }
+        mDrainPromise.Resolve(std::move(mDecodedData), __func__);
+        mDecodedData = MediaDataDecoder::DecodedData();
+      },
+      [self](const mozilla::ipc::ResponseRejectReason& aReason) {
+        self->HandleRejectionError(aReason, [self](const MediaResult& aError) {
+          self->mDrainPromise.RejectIfExists(aError, __func__);
+        });
+      });
+  return mDrainPromise.Ensure(__func__);
+}
+
+RefPtr<mozilla::ShutdownPromise> RemoteDecoderChild::Shutdown() {
+  AssertOnManagerThread();
+  // Shutdown() can be called while an InitPromise is pending.
+  mInitPromiseRequest.DisconnectIfExists();
+  mInitPromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
+  mDecodePromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
+  mDrainPromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
+  mFlushPromise.RejectIfExists(NS_ERROR_DOM_MEDIA_CANCELED, __func__);
+
+  RefPtr<RemoteDecoderChild> self = this;
+  SendShutdown()->Then(
+      mThread, __func__,
+      [self](
+          PRemoteDecoderChild::ShutdownPromise::ResolveOrRejectValue&& aValue) {
+        self->mShutdownPromise.Resolve(aValue.IsResolve(), __func__);
+      });
+  return mShutdownPromise.Ensure(__func__);
+}
+
+bool RemoteDecoderChild::IsHardwareAccelerated(
+    nsACString& aFailureReason) const {
+  AssertOnManagerThread();
+  aFailureReason = mHardwareAcceleratedReason;
+  return mIsHardwareAccelerated;
+}
+
+nsCString RemoteDecoderChild::GetDescriptionName() const {
+  AssertOnManagerThread();
+  return mDescription;
+}
+
+void RemoteDecoderChild::SetSeekThreshold(const media::TimeUnit& aTime) {
+  AssertOnManagerThread();
+  Unused << SendSetSeekThreshold(aTime);
+}
+
+MediaDataDecoder::ConversionRequired RemoteDecoderChild::NeedsConversion()
+    const {
+  AssertOnManagerThread();
+  return mConversion;
+}
+
+void RemoteDecoderChild::AssertOnManagerThread() const {
+  MOZ_ASSERT(mThread->IsOnCurrentThread());
+}
+
+RemoteDecoderManagerChild* RemoteDecoderChild::GetManager() {
+  if (!CanSend()) {
+    return nullptr;
+  }
+  return static_cast<RemoteDecoderManagerChild*>(Manager());
+}
+
+}  // namespace mozilla