Move media/capture/webm_muxer* to media/muxers

media/capture/webm_muxer.h

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef MEDIA_FILTERS_LIBWEBM_MUXER_H_
-#define MEDIA_FILTERS_LIBWEBM_MUXER_H_
-
-#include <stdint.h>
-
-#include <deque>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/numerics/safe_math.h"
-#include "base/strings/string_piece.h"
-#include "base/threading/thread_checker.h"
-#include "base/time/time.h"
-#include "media/base/media_export.h"
-#include "media/base/video_codecs.h"
-#include "third_party/libwebm/source/mkvmuxer.hpp"
-
-namespace gfx {
-class Size;
-}  // namespace gfx
-
-namespace media {
-
-class VideoFrame;
-class AudioParameters;
-
-// Adapter class to manage a WebM container [1], a simplified version of a
-// Matroska container [2], composed of an EBML header, and a single Segment
-// including at least a Track Section and a number of SimpleBlocks each
-// containing a single encoded video or audio frame. WebM container has no
-// Trailer.
-// Clients will push encoded VPx video frames and Opus audio frames one by one
-// via OnEncoded{Video|Audio}(). libwebm will eventually ping the WriteDataCB
-// passed on contructor with the wrapped encoded data.
-// WebmMuxer is designed for use on a single thread.
-// [1] http://www.webmproject.org/docs/container/
-// [2] http://www.matroska.org/technical/specs/index.html
-class MEDIA_EXPORT WebmMuxer : public NON_EXPORTED_BASE(mkvmuxer::IMkvWriter) {
- public:
-  // Callback to be called when WebmMuxer is ready to write a chunk of data,
-  // either any file header or a SingleBlock.
-  using WriteDataCB = base::Callback<void(base::StringPiece)>;
-
-  // |codec| can be VP8 or VP9 and should coincide with whatever is sent in
-  // OnEncodedVideo().
-  WebmMuxer(VideoCodec codec,
-            bool has_video_,
-            bool has_audio_,
-            const WriteDataCB& write_data_callback);
-  ~WebmMuxer() override;
-
-  // Functions to add video and audio frames with |encoded_data.data()|
-  // to WebM Segment.
-  void OnEncodedVideo(const scoped_refptr<VideoFrame>& video_frame,
-                      scoped_ptr<std::string> encoded_data,
-                      base::TimeTicks timestamp,
-                      bool is_key_frame);
-  void OnEncodedAudio(const media::AudioParameters& params,
-                      scoped_ptr<std::string> encoded_data,
-                      base::TimeTicks timestamp);
-
- private:
-  friend class WebmMuxerTest;
-
-  // Methods for creating and adding video and audio tracks, called upon
-  // receiving the first frame of a given Track.
-  // AddVideoTrack adds |frame_size| and |frame_rate| to the Segment
-  // info, although individual frames passed to OnEncodedVideo() can have any
-  // frame size.
-  void AddVideoTrack(const gfx::Size& frame_size, double frame_rate);
-  void AddAudioTrack(const media::AudioParameters& params);
-
-  // IMkvWriter interface.
-  mkvmuxer::int32 Write(const void* buf, mkvmuxer::uint32 len) override;
-  mkvmuxer::int64 Position() const override;
-  mkvmuxer::int32 Position(mkvmuxer::int64 position) override;
-  bool Seekable() const override;
-  void ElementStartNotify(mkvmuxer::uint64 element_id,
-                          mkvmuxer::int64 position) override;
-
-  // Helper to simplify saving frames.
-  void AddFrame(scoped_ptr<std::string> encoded_data,
-                uint8_t track_index,
-                base::TimeTicks timestamp,
-                bool is_key_frame);
-
-  // Used to DCHECK that we are called on the correct thread.
-  base::ThreadChecker thread_checker_;
-
-  // Video Codec configured: VP9 if true, otherwise VP8 is used by default.
-  const bool use_vp9_;
-
-  // Caller-side identifiers to interact with |segment_|, initialised upon
-  // first frame arrival to Add{Video, Audio}Track().
-  uint8_t video_track_index_;
-  uint8_t audio_track_index_;
-
-  // Origin of times for frame timestamps.
-  base::TimeTicks first_frame_timestamp_;
-  base::TimeDelta most_recent_timestamp_;
-
-  // TODO(ajose): Change these when support is added for multiple tracks.
-  // http://crbug.com/528523
-  const bool has_video_;
-  const bool has_audio_;
-
-  // Callback to dump written data as being called by libwebm.
-  const WriteDataCB write_data_callback_;
-
-  // Rolling counter of the position in bytes of the written goo.
-  base::CheckedNumeric<mkvmuxer::int64> position_;
-
-  // The MkvMuxer active element.
-  mkvmuxer::Segment segment_;
-
-  // Hold on to all encoded video frames to dump them with and when audio is
-  // received, if expected, since WebM headers can only be written once.
-  struct EncodedVideoFrame {
-    EncodedVideoFrame(scoped_ptr<std::string> data,
-                      base::TimeTicks timestamp,
-                      bool is_keyframe);
-    ~EncodedVideoFrame();
-
-    scoped_ptr<std::string> data;
-    base::TimeTicks timestamp;
-    bool is_keyframe;
-
-   private:
-    DISALLOW_IMPLICIT_CONSTRUCTORS(EncodedVideoFrame);
-  };
-  std::deque<scoped_ptr<EncodedVideoFrame>> encoded_frames_queue_;
-
-  DISALLOW_COPY_AND_ASSIGN(WebmMuxer);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_FILTERS_LIBWEBM_MUXER_H_