import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

dom/media/webm/NesteggPacketHolder.h

@@ -0,0 +1,124 @@
+/* -*- 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/. */
+#if !defined(NesteggPacketHolder_h_)
+#define NesteggPacketHolder_h_
+
+#include <stdint.h>
+#include "nsAutoRef.h"
+#include "nestegg/nestegg.h"
+
+namespace mozilla {
+
+// Holds a nestegg_packet, and its file offset. This is needed so we
+// know the offset in the file we've played up to, in order to calculate
+// whether it's likely we can play through to the end without needing
+// to stop to buffer, given the current download rate.
+class NesteggPacketHolder {
+public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(NesteggPacketHolder)
+  NesteggPacketHolder()
+    : mPacket(nullptr)
+    , mOffset(-1)
+    , mTimestamp(-1)
+    , mDuration(-1)
+    , mIsKeyframe(false) {}
+
+  bool Init(nestegg_packet* aPacket, int64_t aOffset, unsigned aTrack, bool aIsKeyframe)
+  {
+    uint64_t timestamp_ns;
+    if (nestegg_packet_tstamp(aPacket, &timestamp_ns) == -1) {
+      return false;
+    }
+
+    // We store the timestamp as signed microseconds so that it's easily
+    // comparable to other timestamps we have in the system.
+    mTimestamp = timestamp_ns / 1000;
+    mPacket = aPacket;
+    mOffset = aOffset;
+    mTrack = aTrack;
+    mIsKeyframe = aIsKeyframe;
+
+    uint64_t duration_ns;
+    if (!nestegg_packet_duration(aPacket, &duration_ns)) {
+      mDuration = duration_ns / 1000;
+    }
+    return true;
+  }
+
+  nestegg_packet* Packet() { MOZ_ASSERT(IsInitialized()); return mPacket; }
+  int64_t Offset() { MOZ_ASSERT(IsInitialized()); return mOffset; }
+  int64_t Timestamp() { MOZ_ASSERT(IsInitialized()); return mTimestamp; }
+  int64_t Duration() { MOZ_ASSERT(IsInitialized()); return mDuration; }
+  unsigned Track() { MOZ_ASSERT(IsInitialized()); return mTrack; }
+  bool IsKeyframe() { MOZ_ASSERT(IsInitialized()); return mIsKeyframe; }
+
+private:
+  ~NesteggPacketHolder()
+  {
+    nestegg_free_packet(mPacket);
+  }
+
+  bool IsInitialized() { return mOffset >= 0; }
+
+  nestegg_packet* mPacket;
+
+  // Offset in bytes. This is the offset of the end of the Block
+  // which contains the packet.
+  int64_t mOffset;
+
+  // Packet presentation timestamp in microseconds.
+  int64_t mTimestamp;
+
+  // Packet duration in microseconds; -1 if unknown or retrieval failed.
+  int64_t mDuration;
+
+  // Track ID.
+  unsigned mTrack;
+
+  // Does this packet contain a keyframe?
+  bool mIsKeyframe;
+
+  // Copy constructor and assignment operator not implemented. Don't use them!
+  NesteggPacketHolder(const NesteggPacketHolder &aOther);
+  NesteggPacketHolder& operator= (NesteggPacketHolder const& aOther);
+};
+
+// Queue for holding nestegg packets.
+class WebMPacketQueue {
+ public:
+  int32_t GetSize() {
+    return mQueue.size();
+  }
+
+  void Push(NesteggPacketHolder* aItem) {
+    mQueue.push_back(aItem);
+  }
+
+  void PushFront(NesteggPacketHolder* aItem) {
+    mQueue.push_front(Move(aItem));
+  }
+
+  already_AddRefed<NesteggPacketHolder> PopFront() {
+    RefPtr<NesteggPacketHolder> result = mQueue.front().forget();
+    mQueue.pop_front();
+    return result.forget();
+  }
+
+  void Reset() {
+    while (!mQueue.empty()) {
+      mQueue.pop_front();
+    }
+  }
+
+private:
+  std::deque<RefPtr<NesteggPacketHolder>> mQueue;
+};
+
+
+} // namespace mozilla
+
+#endif
+