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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.
#include "base/macros.h"
#include "media/base/demuxer_stream.h"
#include "media/base/media_export.h"
#include "media/base/media_url_params.h"
#include "url/gurl.h"
namespace media {
// Abstract class that defines how to retrieve "media sources" in DemuxerStream
// form (for most cases) or URL form (for the MediaPlayerRenderer case).
// The sub-classes do not stricly provide demuxer streams, but because all
// sub-classes are for the moment Demuxers, this class has not been renamed to
// "MediaProvider". This class would be a good candidate for renaming, if
// ever Pipeline were to support this class directly, instead of the Demuxer
// interface.
// TODO(tguilbert): Rename this class. See
// 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 DemuxerStreamProvider {
enum Type {
STREAM, // Indicates GetStream() should be used
URL, // Indicates GetUrl() should be used
virtual ~DemuxerStreamProvider();
// For Type::STREAM:
// Returns the first stream of the given stream type (which is not allowed
// to be DemuxerStream::TEXT), or NULL if that type of stream is not
// present.
// NOTE: Once a DemuxerStream pointer is returned from GetStream it is
// guaranteed to stay valid for as long as the Demuxer/DemuxerStreamProvider
// 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.
// Other types:
// Should not be called.
virtual DemuxerStream* GetStream(DemuxerStream::Type type) = 0;
// 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 MediaUrlParams GetMediaUrlParams() const;
virtual DemuxerStreamProvider::Type GetType() const;
} // namespace media