1 files changed, 127 insertions, 0 deletions
diff --git a/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.h b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.h
new file mode 100644
index 000000000..786df0da1
--- /dev/null
+++ b/dom/media/platforms/ffmpeg/FFmpegVideoDecoder.h
@@ -0,0 +1,127 @@
+/* -*- 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 __FFmpegVideoDecoder_h__
+#define __FFmpegVideoDecoder_h__
+
+#include "FFmpegLibWrapper.h"
+#include "FFmpegDataDecoder.h"
+#include "mozilla/Pair.h"
+#include "nsTArray.h"
+
+namespace mozilla
+{
+
+template <int V>
+class FFmpegVideoDecoder : public FFmpegDataDecoder<V>
+{
+};
+
+template <>
+class FFmpegVideoDecoder<LIBAV_VER> : public FFmpegDataDecoder<LIBAV_VER>
+{
+  typedef mozilla::layers::Image Image;
+  typedef mozilla::layers::ImageContainer ImageContainer;
+
+public:
+  FFmpegVideoDecoder(FFmpegLibWrapper* aLib, TaskQueue* aTaskQueue,
+                     MediaDataDecoderCallback* aCallback,
+                     const VideoInfo& aConfig,
+                     ImageContainer* aImageContainer);
+  virtual ~FFmpegVideoDecoder();
+
+  RefPtr<InitPromise> Init() override;
+  void InitCodecContext() override;
+  const char* GetDescriptionName() const override
+  {
+#ifdef USING_MOZFFVPX
+    return "ffvpx video decoder";
+#else
+    return "ffmpeg video decoder";
+#endif
+  }
+  static AVCodecID GetCodecId(const nsACString& aMimeType);
+
+private:
+  MediaResult DoDecode(MediaRawData* aSample) override;
+  MediaResult DoDecode(MediaRawData* aSample, bool* aGotFrame);
+  MediaResult DoDecode(MediaRawData* aSample, uint8_t* aData, int aSize, bool* aGotFrame);
+  void ProcessDrain() override;
+  void ProcessFlush() override;
+  void OutputDelayedFrames();
+
+  /**
+   * This method allocates a buffer for FFmpeg's decoder, wrapped in an Image.
+   * Currently it only supports Planar YUV420, which appears to be the only
+   * non-hardware accelerated image format that FFmpeg's H264 decoder is
+   * capable of outputting.
+   */
+  int AllocateYUV420PVideoBuffer(AVCodecContext* aCodecContext,
+                                 AVFrame* aFrame);
+
+  RefPtr<ImageContainer> mImageContainer;
+  VideoInfo mInfo;
+
+  // Parser used for VP8 and VP9 decoding.
+  AVCodecParserContext* mCodecParser;
+
+  class PtsCorrectionContext {
+  public:
+    PtsCorrectionContext();
+    int64_t GuessCorrectPts(int64_t aPts, int64_t aDts);
+    void Reset();
+    int64_t LastDts() const { return mLastDts; }
+
+  private:
+    int64_t mNumFaultyPts; /// Number of incorrect PTS values so far
+    int64_t mNumFaultyDts; /// Number of incorrect DTS values so far
+    int64_t mLastPts;       /// PTS of the last frame
+    int64_t mLastDts;       /// DTS of the last frame
+  };
+
+  PtsCorrectionContext mPtsContext;
+  int64_t mLastInputDts;
+
+  class DurationMap {
+  public:
+    typedef Pair<int64_t, int64_t> DurationElement;
+
+    // Insert Key and Duration pair at the end of our map.
+    void Insert(int64_t aKey, int64_t aDuration)
+    {
+      mMap.AppendElement(MakePair(aKey, aDuration));
+    }
+    // Sets aDuration matching aKey and remove it from the map if found.
+    // The element returned is the first one found.
+    // Returns true if found, false otherwise.
+    bool Find(int64_t aKey, int64_t& aDuration)
+    {
+      for (uint32_t i = 0; i < mMap.Length(); i++) {
+        DurationElement& element = mMap[i];
+        if (element.first() == aKey) {
+          aDuration = element.second();
+          mMap.RemoveElementAt(i);
+          return true;
+        }
+      }
+      return false;
+    }
+    // Remove all elements of the map.
+    void Clear()
+    {
+      mMap.Clear();
+    }
+
+  private:
+    AutoTArray<DurationElement, 16> mMap;
+  };
+
+  DurationMap mDurationMap;
+};
+
+} // namespace mozilla
+
+#endif // __FFmpegVideoDecoder_h__