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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef MEDIA_BASE_DEMUXER_STREAM_PROVIDER_H_ | |
6 #define MEDIA_BASE_DEMUXER_STREAM_PROVIDER_H_ | |
7 | |
8 #include "base/macros.h" | |
9 #include "media/base/demuxer_stream.h" | |
10 #include "media/base/media_export.h" | |
11 #include "media/base/media_url_params.h" | |
12 #include "url/gurl.h" | |
13 | |
14 namespace media { | |
15 | |
16 // Abstract class that defines how to retrieve "media sources" in DemuxerStream | |
17 // form (for most cases) or URL form (for the MediaPlayerRenderer case). | |
18 // | |
19 // The sub-classes do not stricly provide demuxer streams, but because all | |
20 // sub-classes are for the moment Demuxers, this class has not been renamed to | |
21 // "MediaProvider". This class would be a good candidate for renaming, if | |
22 // ever Pipeline were to support this class directly, instead of the Demuxer | |
23 // interface. | |
24 // TODO(tguilbert): Rename this class. See crbug.com/658062. | |
25 // | |
26 // The derived classes must return a non-null value for the getter method | |
27 // associated with their type, and return a null/empty value for other getters. | |
28 class MEDIA_EXPORT DemuxerStreamProvider { | |
29 public: | |
30 enum Type { | |
31 STREAM, // Indicates GetStream() should be used | |
32 URL, // Indicates GetUrl() should be used | |
33 }; | |
34 | |
35 DemuxerStreamProvider(); | |
36 virtual ~DemuxerStreamProvider(); | |
37 | |
38 // For Type::STREAM: | |
39 // Returns the first stream of the given stream type (which is not allowed | |
40 // to be DemuxerStream::TEXT), or NULL if that type of stream is not | |
41 // present. | |
42 // NOTE: Once a DemuxerStream pointer is returned from GetStream it is | |
43 // guaranteed to stay valid for as long as the Demuxer/DemuxerStreamProvider | |
44 // is alive. But make no assumption that once GetStream returned a non-null | |
45 // pointer for some stream type then all subsequent calls will also return | |
46 // non-null pointer for the same stream type. In MSE Javascript code can | |
47 // remove SourceBuffer from a MediaSource at any point and this will make | |
48 // some previously existing streams inaccessible/unavailable. | |
49 // Other types: | |
50 // Should not be called. | |
51 virtual DemuxerStream* GetStream(DemuxerStream::Type type) = 0; | |
52 | |
53 // For Type::URL: | |
54 // Returns the URL parameters of the media to play. Empty URLs are legal, | |
55 // and should be handled appropriately by the caller. | |
56 // Other types: | |
57 // Should not be called. | |
58 virtual MediaUrlParams GetMediaUrlParams() const; | |
59 | |
60 virtual DemuxerStreamProvider::Type GetType() const; | |
61 | |
62 private: | |
63 DISALLOW_COPY_AND_ASSIGN(DemuxerStreamProvider); | |
64 }; | |
65 | |
66 } // namespace media | |
67 | |
68 #endif // MEDIA_BASE_DEMUXER_STREAM_PROVIDER_H_ | |
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