| // Copyright (c) 2012 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 COBALT_MEDIA_BASE_VIDEO_RENDERER_H_ |
| #define COBALT_MEDIA_BASE_VIDEO_RENDERER_H_ |
| |
| #include "base/basictypes.h" |
| #include "base/callback_forward.h" |
| #include "cobalt/media/base/media_export.h" |
| #include "cobalt/media/base/pipeline_status.h" |
| #include "cobalt/media/base/time_source.h" |
| |
| namespace cobalt { |
| namespace media { |
| |
| class CdmContext; |
| class DemuxerStream; |
| class RendererClient; |
| |
| class MEDIA_EXPORT VideoRenderer { |
| public: |
| VideoRenderer(); |
| |
| // Stops all operations and fires all pending callbacks. |
| virtual ~VideoRenderer(); |
| |
| // Initializes a VideoRenderer with |stream|, executing |init_cb| upon |
| // completion. If initialization fails, only |init_cb| |
| // (not RendererClient::OnError) will be called. |
| // |
| // |cdm_context| can be used to handle encrypted streams. May be null if the |
| // stream is not encrypted. |
| // |
| // |wall_clock_time_cb| is used to convert media timestamps into wallclock |
| // timestamps. |
| virtual void Initialize(DemuxerStream* stream, CdmContext* cdm_context, |
| RendererClient* client, |
| const TimeSource::WallClockTimeCB& wall_clock_time_cb, |
| const PipelineStatusCB& init_cb) = 0; |
| |
| // Discards any video data and stops reading from |stream|, executing |
| // |callback| when completed. |
| // |
| // Clients should expect |buffering_state_cb| to be called with |
| // BUFFERING_HAVE_NOTHING while flushing is in progress. |
| virtual void Flush(const base::Closure& callback) = 0; |
| |
| // Starts playback at |timestamp| by reading from |stream| and decoding and |
| // rendering video. |
| // |
| // Only valid to call after a successful Initialize() or Flush(). |
| virtual void StartPlayingFrom(base::TimeDelta timestamp) = 0; |
| |
| // Called when time starts or stops moving. Time progresses when a base time |
| // has been set and the playback rate is > 0. If either condition changes, |
| // time stops progressing. |
| virtual void OnTimeProgressing() = 0; |
| virtual void OnTimeStopped() = 0; |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(VideoRenderer); |
| }; |
| |
| } // namespace media |
| } // namespace cobalt |
| |
| #endif // COBALT_MEDIA_BASE_VIDEO_RENDERER_H_ |