Not for submission. fastSeek prototype.

media/renderers/video_renderer_impl.h

 // Copyright 2013 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_RENDERERS_VIDEO_RENDERER_IMPL_H_
 #define MEDIA_RENDERERS_VIDEO_RENDERER_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
-#include <deque>
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/condition_variable.h"
 #include "base/synchronization/lock.h"
 #include "base/timer/timer.h"
 #include "media/base/decryptor.h"
 #include "media/base/demuxer_stream.h"
 #include "media/base/media_log.h"
 #include "media/base/pipeline_status.h"
+#include "media/base/stream_position.h"
 #include "media/base/video_decoder.h"
 #include "media/base/video_frame.h"
 #include "media/base/video_renderer.h"
 #include "media/base/video_renderer_sink.h"
 #include "media/filters/decoder_stream.h"
 #include "media/filters/video_renderer_algorithm.h"
 #include "media/renderers/gpu_video_accelerator_factories.h"
 #include "media/video/gpu_memory_buffer_video_frame_pool.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 class TickClock;
 }
 
 namespace media {
 
-// VideoRendererImpl handles reading from a VideoFrameStream storing the
-// results in a queue of decoded frames and executing a callback when a frame is
-// ready for rendering.
+// VideoRendererImpl handles reading from a VideoFrameStream, storing the
+// results in a queue of decoded frames, and selecting the best one for display
+// in response to Render() calls.
 class MEDIA_EXPORT VideoRendererImpl
     : public VideoRenderer,
       public NON_EXPORTED_BASE(VideoRendererSink::RenderCallback) {
  public:
   // |decoders| contains the VideoDecoders to use when initializing.
   //
   // Implementors should avoid doing any sort of heavy work in this method and
   // instead post a task to a common/worker thread to handle rendering.  Slowing
   // down the video thread may result in losing synchronization with audio.
   //
   // Setting |drop_frames_| to true causes the renderer to drop expired frames.
   VideoRendererImpl(
       const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner,
       const scoped_refptr<base::TaskRunner>& worker_task_runner,
       VideoRendererSink* sink,
       ScopedVector<VideoDecoder> decoders,
       bool drop_frames,
       GpuVideoAcceleratorFactories* gpu_factories,
       const scoped_refptr<MediaLog>& media_log);
   ~VideoRendererImpl() override;
 
   // VideoRenderer implementation.
   void Initialize(DemuxerStream* stream,
                   CdmContext* cdm_context,
                   RendererClient* client,
                   const TimeSource::WallClockTimeCB& wall_clock_time_cb,
                   const PipelineStatusCB& init_cb) override;
   void Flush(const base::Closure& callback) override;
-  void StartPlayingFrom(base::TimeDelta timestamp) override;
+  void StartPlayingFrom(StreamPosition position) override;
   void OnTimeStateChanged(bool time_progressing) override;
 
   void SetTickClockForTesting(std::unique_ptr<base::TickClock> tick_clock);
   void SetGpuMemoryBufferVideoForTesting(
       std::unique_ptr<GpuMemoryBufferVideoFramePool> gpu_memory_buffer_pool);
   size_t frames_queued_for_testing() const {
     return algorithm_->frames_queued();
   }
 
   // VideoRendererSink::RenderCallback implementation.
@@ skipping 18 matching lines @@
   // copied asynchronously and FrameReady will be called once finished copying.
   void FrameReadyForCopyingToGpuMemoryBuffers(
       VideoFrameStream::Status status,
       const scoped_refptr<VideoFrame>& frame);
 
   // Callback for |video_frame_stream_| to deliver decoded video frames and
   // report video decoding status.
   void FrameReady(VideoFrameStream::Status status,
                   const scoped_refptr<VideoFrame>& frame);
 
-  // Helper method for enqueueing a frame to |alogorithm_|.
+  // Helper method for enqueueing a frame to |algorithm_|.
   void AddReadyFrame_Locked(const scoped_refptr<VideoFrame>& frame);
 
   // Helper method that schedules an asynchronous read from the
   // |video_frame_stream_| as long as there isn't a pending read and we have
   // capacity.
   void AttemptRead_Locked();
 
   // Called when VideoFrameStream::Reset() completes.
   void OnVideoFrameStreamResetDone();
 
@@ skipping 123 matching lines @@
 
   bool drop_frames_;
 
   BufferingState buffering_state_;
 
   // Playback operation callbacks.
   PipelineStatusCB init_cb_;
   base::Closure flush_cb_;
   TimeSource::WallClockTimeCB wall_clock_time_cb_;
 
+  bool start_rendering_from_first_frame_;
+
   base::TimeDelta start_timestamp_;
 
   // Keeps track of the number of frames decoded and dropped since the
   // last call to |statistics_cb_|. These must be accessed under lock.
   int frames_decoded_;
   int frames_dropped_;
 
   std::unique_ptr<base::TickClock> tick_clock_;
 
   // Algorithm for selecting which frame to render; manages frames and all
@@ skipping 28 matching lines @@
   // want to discard video frames that might be received after the stream has
   // been reset.
   base::WeakPtrFactory<VideoRendererImpl> frame_callback_weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoRendererImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_RENDERERS_VIDEO_RENDERER_IMPL_H_