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// Copyright 2014 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_RENDERER_H_
#define MEDIA_BASE_RENDERER_H_
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "media/base/buffering_state.h"
#include "media/base/cdm_context.h"
#include "media/base/media_export.h"
#include "media/base/pipeline_status.h"
namespace media {
class DemuxerStreamProvider;
class VideoFrame;
class MEDIA_EXPORT Renderer {
public:
Renderer();
// Stops rendering and fires any pending callbacks.
virtual ~Renderer();
// Initializes the Renderer with |demuxer_stream_provider|, executing
// |init_cb| upon completion. If initialization fails, only |init_cb| (not
// |error_cb|) should be called. |demuxer_stream_provider| must be valid for
// the lifetime of the Renderer object. |init_cb| must only be run after this
// method has returned. Firing |init_cb| may result in the immediate
// destruction of the caller, so it must be run only prior to returning.
//
// Permanent callbacks:
// - |statistics_cb|: Executed periodically with rendering statistics.
// - |buffering_state_cb|: Executed when buffering state is changed.
// - |ended_cb|: Executed when rendering has reached the end of stream.
// - |error_cb|: Executed if any error was encountered after initialization.
// - |waiting_for_decryption_key_cb|: Executed whenever the key needed to
// decrypt the stream is not available.
virtual void Initialize(
DemuxerStreamProvider* demuxer_stream_provider,
const PipelineStatusCB& init_cb,
const StatisticsCB& statistics_cb,
const BufferingStateCB& buffering_state_cb,
const base::Closure& ended_cb,
const PipelineStatusCB& error_cb,
const base::Closure& waiting_for_decryption_key_cb) = 0;
// Associates the |cdm_context| with this Renderer for decryption (and
// decoding) of media data, then fires |cdm_attached_cb| with the result.
virtual void SetCdm(CdmContext* cdm_context,
const CdmAttachedCB& cdm_attached_cb) = 0;
// The following functions must be called after Initialize().
// Discards any buffered data, executing |flush_cb| when completed.
virtual void Flush(const base::Closure& flush_cb) = 0;
// Starts rendering from |time|.
virtual void StartPlayingFrom(base::TimeDelta time) = 0;
// Updates the current playback rate. The default playback rate should be 1.
virtual void SetPlaybackRate(double playback_rate) = 0;
// Sets the output volume. The default volume should be 1.
virtual void SetVolume(float volume) = 0;
// Returns the current media time.
virtual base::TimeDelta GetMediaTime() = 0;
// Returns whether |this| renders audio.
virtual bool HasAudio() = 0;
// Returns whether |this| renders video.
virtual bool HasVideo() = 0;
private:
DISALLOW_COPY_AND_ASSIGN(Renderer);
};
} // namespace media
#endif // MEDIA_BASE_RENDERER_H_
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