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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef MEDIA_BASE_MEDIA_TRACK_H_ | 5 #ifndef MEDIA_BASE_MEDIA_TRACK_H_ |
6 #define MEDIA_BASE_MEDIA_TRACK_H_ | 6 #define MEDIA_BASE_MEDIA_TRACK_H_ |
7 | 7 |
8 #include <string> | 8 #include <string> |
9 | 9 |
10 #include "media/base/media_export.h" | 10 #include "media/base/media_export.h" |
11 #include "media/base/stream_parser.h" | 11 #include "media/base/stream_parser.h" |
12 | 12 |
13 namespace media { | 13 namespace media { |
14 | 14 |
15 class MEDIA_EXPORT MediaTrack { | 15 class MEDIA_EXPORT MediaTrack { |
16 public: | 16 public: |
17 enum Type { Text, Audio, Video }; | 17 enum Type { Text, Audio, Video }; |
18 using Id = std::string; | |
18 MediaTrack(Type type, | 19 MediaTrack(Type type, |
19 StreamParser::TrackId bytestream_track_id, | 20 StreamParser::TrackId bytestream_track_id, |
20 const std::string& kind, | 21 const std::string& kind, |
21 const std::string& label, | 22 const std::string& label, |
22 const std::string& lang); | 23 const std::string& lang); |
23 ~MediaTrack(); | 24 ~MediaTrack(); |
24 | 25 |
25 Type type() const { return type_; } | 26 Type type() const { return type_; } |
26 | 27 |
27 StreamParser::TrackId bytestream_track_id() const { | 28 StreamParser::TrackId bytestream_track_id() const { |
28 return bytestream_track_id_; | 29 return bytestream_track_id_; |
29 } | 30 } |
30 const std::string& kind() const { return kind_; } | 31 const std::string& kind() const { return kind_; } |
31 const std::string& label() const { return label_; } | 32 const std::string& label() const { return label_; } |
32 const std::string& language() const { return language_; } | 33 const std::string& language() const { return language_; } |
33 | 34 |
35 Id id() const { return id_; } | |
36 void set_id(Id id) { | |
37 DCHECK(id_.empty()); | |
38 DCHECK(!id.empty()); | |
39 id_ = id; | |
40 } | |
xhwang
2016/06/10 17:06:53
I wonder whether we can generate this ID when we c
servolk
2016/06/10 22:05:25
I don't think we can simplify this much further. I
| |
41 | |
34 private: | 42 private: |
35 Type type_; | 43 Type type_; |
44 | |
45 // |bytestream_track_id_| is read from the bytestream and is guaranteed to be | |
46 // unique only within the scope of single bytestream. But we might have | |
47 // multiple bytestreams (MediaSource might have multiple SourceBuffers | |
48 // attached to it, which translates into ChunkDemuxer having multiple | |
49 // MediaSourceStates and multiple bytestreams). Thus bytestream track ids | |
50 // are not guaranteed to be unique at the Demuxer and HTMLMediaElement level. | |
51 // So we generate truly unique media track |id_| on the Demuxer level. | |
xhwang
2016/06/10 17:06:54
I <3 this comment. Thanks!
servolk
2016/06/10 22:05:25
Acknowledged.
| |
36 StreamParser::TrackId bytestream_track_id_; | 52 StreamParser::TrackId bytestream_track_id_; |
xhwang
2016/06/10 17:06:53
nit: I wonder whether StreamParser::TrackId should
servolk
2016/06/10 22:05:25
Yes, I think we could rename StreamParser::TrackId
| |
53 Id id_; | |
54 | |
55 // These properties are read from input streams by stream parsers as specified | |
56 // in https://dev.w3.org/html5/html-sourcing-inband-tracks/. | |
37 std::string kind_; | 57 std::string kind_; |
38 std::string label_; | 58 std::string label_; |
39 std::string language_; | 59 std::string language_; |
40 }; | 60 }; |
41 | 61 |
42 } // namespace media | 62 } // namespace media |
43 | 63 |
44 #endif // MEDIA_BASE_MEDIA_TRACK_H_ | 64 #endif // MEDIA_BASE_MEDIA_TRACK_H_ |
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