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// Copyright (c) 2008-2009 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.
// FilterHost describes an interface for individual filters to access and
// modify global playback information. Every filter is given a filter host
// reference as part of initialization.
//
// This interface is intentionally verbose to cover the needs for the different
// types of filters (see media/base/filters.h for filter definitionss). Filters
// typically use parts of the interface that are relevant to their function.
// For example, an audio renderer filter typically calls SetTime as it feeds
// data to the audio hardware. A video renderer filter typically calls GetTime
// to synchronize video with audio. An audio and video decoder would typically
// have no need to call either SetTime or GetTime.
#ifndef MEDIA_BASE_FILTER_HOST_H_
#define MEDIA_BASE_FILTER_HOST_H_
#include "base/task.h"
#include "media/base/filters.h"
#include "media/base/pipeline.h"
namespace media {
class FilterHost {
public:
// Stops execution of the pipeline due to a fatal error. Do not call this
// method with PIPELINE_OK or PIPELINE_STOPPING (used internally by pipeline).
virtual void SetError(PipelineError error) = 0;
// Gets the current time in microseconds.
virtual base::TimeDelta GetTime() const = 0;
// Updates the current time. Other filters should poll to examine the updated
// time.
virtual void SetTime(base::TimeDelta time) = 0;
// Get the duration of the media in microseconds. If the duration has not
// been determined yet, then returns 0.
virtual void SetDuration(base::TimeDelta duration) = 0;
// Set the approximate amount of playable data buffered so far in micro-
// seconds.
virtual void SetBufferedTime(base::TimeDelta buffered_time) = 0;
// Set the total size of the media file.
virtual void SetTotalBytes(int64 total_bytes) = 0;
// Sets the total number of bytes that are buffered on the client and ready to
// be played.
virtual void SetBufferedBytes(int64 buffered_bytes) = 0;
// Sets the size of the video output in pixel units.
virtual void SetVideoSize(size_t width, size_t height) = 0;
// Sets the flag to indicate that we are doing streaming.
virtual void SetStreaming(bool streaming) = 0;
// Broadcast a message of type |message| to all other filters from |source|.
virtual void BroadcastMessage(FilterMessage message) = 0;
protected:
virtual ~FilterHost() {}
};
} // namespace media
#endif // MEDIA_BASE_FILTER_HOST_H_
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