1 files changed, 99 insertions, 0 deletions
diff --git a/dom/media/encoder/VP8TrackEncoder.h b/dom/media/encoder/VP8TrackEncoder.h
new file mode 100644
index 000000000..5a046ee5d
--- /dev/null
+++ b/dom/media/encoder/VP8TrackEncoder.h
@@ -0,0 +1,99 @@
+/* -*- 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/. */
+
+#ifndef VP8TrackEncoder_h_
+#define VP8TrackEncoder_h_
+
+#include "TrackEncoder.h"
+#include "vpx/vpx_codec.h"
+
+namespace mozilla {
+
+typedef struct vpx_codec_ctx vpx_codec_ctx_t;
+typedef struct vpx_codec_enc_cfg vpx_codec_enc_cfg_t;
+typedef struct vpx_image vpx_image_t;
+
+/**
+ * VP8TrackEncoder implements VideoTrackEncoder by using libvpx library.
+ * We implement a realtime and fixed FPS encoder. In order to achieve that,
+ * there is a pick target frame and drop frame encoding policy implemented in
+ * GetEncodedTrack.
+ */
+class VP8TrackEncoder : public VideoTrackEncoder
+{
+  enum EncodeOperation {
+    ENCODE_NORMAL_FRAME, // VP8 track encoder works normally.
+    ENCODE_I_FRAME, // The next frame will be encoded as I-Frame.
+    SKIP_FRAME, // Skip the next frame.
+  };
+public:
+  explicit VP8TrackEncoder(TrackRate aTrackRate);
+  virtual ~VP8TrackEncoder();
+
+  already_AddRefed<TrackMetadataBase> GetMetadata() final override;
+
+  nsresult GetEncodedTrack(EncodedFrameContainer& aData) final override;
+
+  void ReplyGetSourceSurface(already_AddRefed<gfx::SourceSurface> aSurf);
+protected:
+  nsresult Init(int32_t aWidth, int32_t aHeight,
+                int32_t aDisplayWidth, int32_t aDisplayHeight) final override;
+
+private:
+  // Calculate the target frame's encoded duration.
+  StreamTime CalculateEncodedDuration(StreamTime aDurationCopied);
+
+  // Calculate the mRemainingTicks for next target frame.
+  StreamTime CalculateRemainingTicks(StreamTime aDurationCopied,
+                                     StreamTime aEncodedDuration);
+
+  // Get the EncodeOperation for next target frame.
+  EncodeOperation GetNextEncodeOperation(TimeDuration aTimeElapsed,
+                                         StreamTime aProcessedDuration);
+
+  // Get the encoded data from encoder to aData.
+  // Return value: false if the vpx_codec_get_cx_data returns null
+  //               for EOS detection.
+  bool GetEncodedPartitions(EncodedFrameContainer& aData);
+
+  // Prepare the input data to the mVPXImageWrapper for encoding.
+  nsresult PrepareRawFrame(VideoChunk &aChunk);
+
+  already_AddRefed<gfx::SourceSurface> GetSourceSurface(already_AddRefed<layers::Image> aImg);
+
+  // Output frame rate.
+  uint32_t mEncodedFrameRate;
+  // Duration for the output frame, reciprocal to mEncodedFrameRate.
+  StreamTime mEncodedFrameDuration;
+  // Encoded timestamp.
+  StreamTime mEncodedTimestamp;
+  // Duration to the next encode frame.
+  StreamTime mRemainingTicks;
+
+  // Muted frame, we only create it once.
+  RefPtr<layers::Image> mMuteFrame;
+
+  // I420 frame, for converting to I420.
+  nsTArray<uint8_t> mI420Frame;
+
+  /**
+   * A local segment queue which takes the raw data out from mRawSegment in the
+   * call of GetEncodedTrack(). Since we implement the fixed FPS encoding
+   * policy, it needs to be global in order to store the leftover segments
+   * taken from mRawSegment.
+   */
+  VideoSegment mSourceSegment;
+
+  // VP8 relative members.
+  // Codec context structure.
+  nsAutoPtr<vpx_codec_ctx_t> mVPXContext;
+  // Image Descriptor.
+  nsAutoPtr<vpx_image_t> mVPXImageWrapper;
+  RefPtr<gfx::SourceSurface> mSourceSurface;
+};
+
+} // namespace mozilla
+
+#endif