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// Copyright (c) 2011 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_DEMUXER_H_
#define MEDIA_BASE_DEMUXER_H_
#include "base/memory/ref_counted.h"
#include "base/time.h"
#include "media/base/data_source.h"
#include "media/base/demuxer_stream.h"
#include "media/base/media_export.h"
#include "media/base/pipeline_status.h"
#include "media/base/preload.h"
namespace media {
class MEDIA_EXPORT DemuxerHost : public DataSourceHost {
public:
virtual ~DemuxerHost();
// 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;
// Sets the byte offset at which the client is requesting the video.
virtual void SetCurrentReadPosition(int64 offset) = 0;
// Stops execution of the pipeline due to a fatal error. Do not call this
// method with PIPELINE_OK.
virtual void OnDemuxerError(PipelineStatus error) = 0;
};
class MEDIA_EXPORT Demuxer
: public base::RefCountedThreadSafe<Demuxer> {
public:
Demuxer();
// Sets the private member |host_|. This is the first method called by
// the DemuxerHost after a demuxer is created. The host holds a strong
// reference to the demuxer. The reference held by the host is guaranteed
// to be released before the host object is destroyed by the pipeline.
virtual void set_host(DemuxerHost* host);
// The pipeline playback rate has been changed. Demuxers may implement this
// method if they need to respond to this call.
virtual void SetPlaybackRate(float playback_rate);
// Carry out any actions required to seek to the given time, executing the
// callback upon completion.
virtual void Seek(base::TimeDelta time, const PipelineStatusCB& callback);
// The pipeline is being stopped either as a result of an error or because
// the client called Stop().
virtual void Stop(const base::Closure& callback);
// This method is called from the pipeline when the audio renderer
// is disabled. Demuxers can ignore the notification if they do not
// need to react to this event.
//
// TODO(acolwell): Change to generic DisableStream(DemuxerStream::Type).
virtual void OnAudioRendererDisabled();
// Returns the given stream type, or NULL if that type is not present.
virtual scoped_refptr<DemuxerStream> GetStream(DemuxerStream::Type type) = 0;
// Alert the Demuxer that the video preload value has been changed.
virtual void SetPreload(Preload preload) = 0;
// Returns the starting time for the media file.
virtual base::TimeDelta GetStartTime() const = 0;
// Returns the content bitrate. May be obtained from container or
// approximated. Returns 0 if it is unknown.
virtual int GetBitrate() = 0;
// Returns true if the source is from a local file or stream (such as a
// webcam stream), false otherwise.
virtual bool IsLocalSource() = 0;
// Returns true if seeking is possible; false otherwise.
virtual bool IsSeekable() = 0;
protected:
// Only allow derived objects access to the DemuxerHost. This is
// kept out of the public interface because demuxers need to be
// aware of all calls made to the host object so they can insure
// the state presented to the host is always consistent with its own
// state.
DemuxerHost* host() { return host_; }
friend class base::RefCountedThreadSafe<Demuxer>;
virtual ~Demuxer();
private:
DemuxerHost* host_;
DISALLOW_COPY_AND_ASSIGN(Demuxer);
};
} // namespace media
#endif // MEDIA_BASE_DEMUXER_H_
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