1 files changed, 281 insertions, 0 deletions
diff --git a/dom/media/gmp/GMPPlatform.cpp b/dom/media/gmp/GMPPlatform.cpp
new file mode 100644
index 0000000000..1a76015ed4
--- /dev/null
+++ b/dom/media/gmp/GMPPlatform.cpp
@@ -0,0 +1,281 @@
+/* -*- 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 "GMPPlatform.h"
+#include "GMPStorageChild.h"
+#include "GMPTimerChild.h"
+#include "mozilla/Monitor.h"
+#include "GMPChild.h"
+#include "mozilla/Mutex.h"
+#include "base/thread.h"
+#include "base/time.h"
+#include "mozilla/ReentrantMonitor.h"
+
+#include <ctime>
+
+namespace mozilla::gmp {
+
+static MessageLoop* sMainLoop = nullptr;
+static GMPChild* sChild = nullptr;
+
+static bool IsOnChildMainThread() {
+  return sMainLoop && sMainLoop == MessageLoop::current();
+}
+
+// We just need a refcounted wrapper for GMPTask objects.
+class GMPRunnable final {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPRunnable)
+
+  explicit GMPRunnable(GMPTask* aTask) : mTask(aTask) { MOZ_ASSERT(mTask); }
+
+  void Run() {
+    mTask->Run();
+    mTask->Destroy();
+    mTask = nullptr;
+  }
+
+ private:
+  ~GMPRunnable() = default;
+
+  GMPTask* mTask;
+};
+
+class GMPSyncRunnable final {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(GMPSyncRunnable)
+
+  GMPSyncRunnable(GMPTask* aTask, MessageLoop* aMessageLoop)
+      : mDone(false),
+        mTask(aTask),
+        mMessageLoop(aMessageLoop),
+        mMonitor("GMPSyncRunnable") {
+    MOZ_ASSERT(mTask);
+    MOZ_ASSERT(mMessageLoop);
+  }
+
+  void Post() {
+    // We assert here for two reasons.
+    // 1) Nobody should be blocking the main thread.
+    // 2) This prevents deadlocks when doing sync calls to main which if the
+    //    main thread tries to do a sync call back to the calling thread.
+    MOZ_ASSERT(!IsOnChildMainThread());
+
+    mMessageLoop->PostTask(NewRunnableMethod("gmp::GMPSyncRunnable::Run", this,
+                                             &GMPSyncRunnable::Run));
+    MonitorAutoLock lock(mMonitor);
+    while (!mDone) {
+      lock.Wait();
+    }
+  }
+
+  void Run() {
+    mTask->Run();
+    mTask->Destroy();
+    mTask = nullptr;
+    MonitorAutoLock lock(mMonitor);
+    mDone = true;
+    lock.Notify();
+  }
+
+ private:
+  ~GMPSyncRunnable() = default;
+
+  bool mDone;
+  GMPTask* mTask;
+  MessageLoop* mMessageLoop;
+  Monitor mMonitor MOZ_UNANNOTATED;
+};
+
+class GMPThreadImpl : public GMPThread {
+ public:
+  GMPThreadImpl();
+  virtual ~GMPThreadImpl();
+
+  // GMPThread
+  void Post(GMPTask* aTask) override;
+  void Join() override;
+
+ private:
+  Mutex mMutex MOZ_UNANNOTATED;
+  base::Thread mThread;
+};
+
+GMPErr CreateThread(GMPThread** aThread) {
+  if (!aThread) {
+    return GMPGenericErr;
+  }
+
+  *aThread = new GMPThreadImpl();
+
+  return GMPNoErr;
+}
+
+GMPErr RunOnMainThread(GMPTask* aTask) {
+  if (!aTask || !sMainLoop) {
+    return GMPGenericErr;
+  }
+
+  RefPtr<GMPRunnable> r = new GMPRunnable(aTask);
+  sMainLoop->PostTask(
+      NewRunnableMethod("gmp::GMPRunnable::Run", r, &GMPRunnable::Run));
+
+  return GMPNoErr;
+}
+
+GMPErr SyncRunOnMainThread(GMPTask* aTask) {
+  if (!aTask || !sMainLoop || IsOnChildMainThread()) {
+    return GMPGenericErr;
+  }
+
+  RefPtr<GMPSyncRunnable> r = new GMPSyncRunnable(aTask, sMainLoop);
+
+  r->Post();
+
+  return GMPNoErr;
+}
+
+class GMPMutexImpl : public GMPMutex {
+ public:
+  GMPMutexImpl();
+  virtual ~GMPMutexImpl();
+
+  // GMPMutex
+  void Acquire() override;
+  void Release() override;
+  void Destroy() override;
+
+ private:
+  ReentrantMonitor mMonitor MOZ_UNANNOTATED;
+};
+
+GMPErr CreateMutex(GMPMutex** aMutex) {
+  if (!aMutex) {
+    return GMPGenericErr;
+  }
+
+  *aMutex = new GMPMutexImpl();
+
+  return GMPNoErr;
+}
+
+GMPErr CreateRecord(const char* aRecordName, uint32_t aRecordNameSize,
+                    GMPRecord** aOutRecord, GMPRecordClient* aClient) {
+  if (aRecordNameSize > GMP_MAX_RECORD_NAME_SIZE || aRecordNameSize == 0) {
+    NS_WARNING("GMP tried to CreateRecord with too long or 0 record name");
+    return GMPGenericErr;
+  }
+  GMPStorageChild* storage = sChild->GetGMPStorage();
+  if (!storage) {
+    return GMPGenericErr;
+  }
+  MOZ_ASSERT(storage);
+  return storage->CreateRecord(nsDependentCString(aRecordName, aRecordNameSize),
+                               aOutRecord, aClient);
+}
+
+GMPErr SetTimerOnMainThread(GMPTask* aTask, int64_t aTimeoutMS) {
+  if (!aTask || !sMainLoop || !IsOnChildMainThread()) {
+    return GMPGenericErr;
+  }
+  GMPTimerChild* timers = sChild->GetGMPTimers();
+  NS_ENSURE_TRUE(timers, GMPGenericErr);
+  return timers->SetTimer(aTask, aTimeoutMS);
+}
+
+GMPErr GetClock(GMPTimestamp* aOutTime) {
+  if (!aOutTime) {
+    return GMPGenericErr;
+  }
+  *aOutTime = base::Time::Now().ToDoubleT() * 1000.0;
+  return GMPNoErr;
+}
+
+void InitPlatformAPI(GMPPlatformAPI& aPlatformAPI, GMPChild* aChild) {
+  if (!sMainLoop) {
+    sMainLoop = MessageLoop::current();
+  }
+  if (!sChild) {
+    sChild = aChild;
+  }
+
+  aPlatformAPI.version = 0;
+  aPlatformAPI.createthread = &CreateThread;
+  aPlatformAPI.runonmainthread = &RunOnMainThread;
+  aPlatformAPI.syncrunonmainthread = &SyncRunOnMainThread;
+  aPlatformAPI.createmutex = &CreateMutex;
+  aPlatformAPI.createrecord = &CreateRecord;
+  aPlatformAPI.settimer = &SetTimerOnMainThread;
+  aPlatformAPI.getcurrenttime = &GetClock;
+}
+
+void SendFOGData(ipc::ByteBuf&& buf) {
+  if (sChild) {
+    sChild->SendFOGData(std::move(buf));
+  }
+}
+
+GMPThreadImpl::GMPThreadImpl() : mMutex("GMPThreadImpl"), mThread("GMPThread") {
+  MOZ_COUNT_CTOR(GMPThread);
+}
+
+GMPThreadImpl::~GMPThreadImpl() { MOZ_COUNT_DTOR(GMPThread); }
+
+void GMPThreadImpl::Post(GMPTask* aTask) {
+  MutexAutoLock lock(mMutex);
+
+  if (!mThread.IsRunning()) {
+    bool started = mThread.Start();
+    if (!started) {
+      NS_WARNING("Unable to start GMPThread!");
+      return;
+    }
+  }
+
+  RefPtr<GMPRunnable> r = new GMPRunnable(aTask);
+  mThread.message_loop()->PostTask(
+      NewRunnableMethod("gmp::GMPRunnable::Run", r.get(), &GMPRunnable::Run));
+}
+
+void GMPThreadImpl::Join() {
+  {
+    MutexAutoLock lock(mMutex);
+    if (mThread.IsRunning()) {
+      mThread.Stop();
+    }
+  }
+  delete this;
+}
+
+GMPMutexImpl::GMPMutexImpl() : mMonitor("gmp-mutex") {
+  MOZ_COUNT_CTOR(GMPMutexImpl);
+}
+
+GMPMutexImpl::~GMPMutexImpl() { MOZ_COUNT_DTOR(GMPMutexImpl); }
+
+void GMPMutexImpl::Destroy() { delete this; }
+
+MOZ_PUSH_IGNORE_THREAD_SAFETY
+void GMPMutexImpl::Acquire() { mMonitor.Enter(); }
+
+void GMPMutexImpl::Release() { mMonitor.Exit(); }
+MOZ_POP_THREAD_SAFETY
+
+GMPTask* NewGMPTask(std::function<void()>&& aFunction) {
+  class Task : public GMPTask {
+   public:
+    explicit Task(std::function<void()>&& aFunction)
+        : mFunction(std::move(aFunction)) {}
+    void Destroy() override { delete this; }
+    ~Task() override = default;
+    void Run() override { mFunction(); }
+
+   private:
+    std::function<void()> mFunction;
+  };
+  return new Task(std::move(aFunction));
+}
+
+}  // namespace mozilla::gmp