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// 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 MEDIA_BASE_VIDEO_RENDERER_H_
#define MEDIA_BASE_VIDEO_RENDERER_H_
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "media/base/buffering_state.h"
#include "media/base/media_export.h"
#include "media/base/pipeline_status.h"
#include "media/base/time_source.h"
namespace media {
class CdmContext;
class DemuxerStream;
class VideoDecoder;
class VideoFrame;
class MEDIA_EXPORT VideoRenderer {
public:
// Used to paint VideoFrame.
typedef base::Callback<void(const scoped_refptr<VideoFrame>&)> PaintCB;
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 |error_cb|) will
// be called.
//
// |cdm_context| can be used to handle encrypted streams. May be null if the
// stream is not encrypted.
//
// |statistics_cb| is executed periodically with video rendering stats, such
// as dropped frames.
//
// |buffering_state_cb| is executed when video rendering has either run out of
// data or has enough data to continue playback.
//
// |ended_cb| is executed when video rendering has reached the end of stream.
//
// |error_cb| is executed if an error was encountered after initialization.
//
// |wall_clock_time_cb| is used to convert media timestamps into wallclock
// timestamps.
//
// |waiting_for_decryption_key_cb| is executed whenever the key needed to
// decrypt the stream is not available.
virtual void Initialize(
DemuxerStream* stream,
const PipelineStatusCB& init_cb,
CdmContext* cdm_context,
const StatisticsCB& statistics_cb,
const BufferingStateCB& buffering_state_cb,
const base::Closure& ended_cb,
const PipelineStatusCB& error_cb,
const TimeSource::WallClockTimeCB& wall_clock_time_cb,
const base::Closure& waiting_for_decryption_key_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_progressing| will be false.
virtual void OnTimeStateChanged(bool time_progressing) = 0;
private:
DISALLOW_COPY_AND_ASSIGN(VideoRenderer);
};
} // namespace media
#endif // MEDIA_BASE_VIDEO_RENDERER_H_
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