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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_MEDIA_RESOURCE_H_
#define MEDIA_BASE_MEDIA_RESOURCE_H_
#include <vector>
#include "base/time/time.h"
#include "media/base/demuxer_stream.h"
#include "media/base/media_export.h"
#include "media/base/media_url_params.h"
namespace media {
// Abstract class that defines how to retrieve "media resources" in
// DemuxerStream form (for most cases) or URL form (for the MediaPlayerRenderer
// case).
//
// The derived classes must return a non-null value for the getter method
// associated with their type, and return a null/empty value for other getters.
class MEDIA_EXPORT MediaResource {
public:
enum Type {
STREAM, // Indicates GetAllStreams() or GetFirstStream() should be used
URL, // Indicates GetUrl() should be used
};
MediaResource();
MediaResource(const MediaResource&) = delete;
MediaResource& operator=(const MediaResource&) = delete;
virtual ~MediaResource();
virtual MediaResource::Type GetType() const;
// For Type::STREAM:
// Returns a collection of available DemuxerStream objects.
// NOTE: Once a DemuxerStream pointer is returned from GetStream it is
// guaranteed to stay valid for as long as the Demuxer/MediaResource
// is alive. But make no assumption that once GetStream returned a non-null
// pointer for some stream type then all subsequent calls will also return
// non-null pointer for the same stream type. In MSE Javascript code can
// remove SourceBuffer from a MediaSource at any point and this will make
// some previously existing streams inaccessible/unavailable.
virtual std::vector<DemuxerStream*> GetAllStreams() = 0;
// A helper function that return the first stream of the given `type` if one
// exists or a null pointer if there is no streams of that type.
DemuxerStream* GetFirstStream(DemuxerStream::Type type);
// For Type::URL:
// Returns the URL parameters of the media to play. Empty URLs are legal,
// and should be handled appropriately by the caller.
// Other types:
// Should not be called.
virtual const MediaUrlParams& GetMediaUrlParams() const;
// This method is only used with the MediaUrlDemuxer, to propagate duration
// changes coming from the MediaPlayerRendereClient.
//
// This method could be refactored if WMPI was aware of the concrete type of
// Demuxer* it is dealing with.
virtual void ForwardDurationChangeToDemuxerHost(base::TimeDelta duration);
};
} // namespace media
#endif // MEDIA_BASE_MEDIA_RESOURCE_H_
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