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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 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 #include "media/webm/webm_tracks_parser.h" | 5 #include "media/webm/webm_tracks_parser.h" |
6 | 6 |
7 #include "base/logging.h" | 7 #include "base/logging.h" |
8 #include "base/string_util.h" | 8 #include "base/string_util.h" |
9 #include "media/base/buffers.h" | 9 #include "media/base/buffers.h" |
10 #include "media/webm/webm_constants.h" | 10 #include "media/webm/webm_constants.h" |
11 #include "media/webm/webm_content_encodings.h" | 11 #include "media/webm/webm_content_encodings.h" |
12 | 12 |
13 namespace media { | 13 namespace media { |
14 | 14 |
15 // Values for TrackType element. | 15 // Values for TrackType element. |
16 static const int kWebMTrackTypeVideo = 1; | 16 static const int kWebMTrackTypeVideo = 1; |
17 static const int kWebMTrackTypeAudio = 2; | 17 static const int kWebMTrackTypeAudio = 2; |
18 | 18 |
19 WebMTracksParser::WebMTracksParser() | 19 WebMTracksParser::WebMTracksParser() |
20 : track_type_(-1), | 20 : track_type_(-1), |
21 track_num_(-1), | 21 track_num_(-1), |
22 audio_track_num_(-1), | 22 audio_track_num_(-1), |
23 video_track_num_(-1) { | 23 video_track_num_(-1) { |
24 } | 24 } |
25 | 25 |
26 WebMTracksParser::~WebMTracksParser() {} | 26 WebMTracksParser::~WebMTracksParser() {} |
27 | 27 |
28 const std::string& WebMTracksParser::video_encryption_key_id() const { | |
29 if (!video_content_encodings_client_.get()) | |
30 return EmptyString(); | |
31 | |
32 DCHECK(!video_content_encodings_client_->content_encodings().empty()); | |
33 return video_content_encodings_client_->content_encodings()[0]-> | |
34 encryption_key_id(); | |
35 } | |
36 | |
37 int WebMTracksParser::Parse(const uint8* buf, int size) { | 28 int WebMTracksParser::Parse(const uint8* buf, int size) { |
38 track_type_ =-1; | 29 track_type_ =-1; |
39 track_num_ = -1; | 30 track_num_ = -1; |
40 audio_track_num_ = -1; | 31 audio_track_num_ = -1; |
41 video_track_num_ = -1; | 32 video_track_num_ = -1; |
42 | 33 |
43 WebMListParser parser(kWebMIdTracks, this); | 34 WebMListParser parser(kWebMIdTracks, this); |
44 int result = parser.Parse(buf, size); | 35 int result = parser.Parse(buf, size); |
45 | 36 |
46 if (result <= 0) | 37 if (result <= 0) |
47 return result; | 38 return result; |
48 | 39 |
49 // For now we do all or nothing parsing. | 40 // For now we do all or nothing parsing. |
50 return parser.IsParsingComplete() ? result : 0; | 41 return parser.IsParsingComplete() ? result : 0; |
51 } | 42 } |
52 | 43 |
53 | |
54 WebMParserClient* WebMTracksParser::OnListStart(int id) { | 44 WebMParserClient* WebMTracksParser::OnListStart(int id) { |
55 if (id == kWebMIdContentEncodings) { | 45 if (id == kWebMIdContentEncodings) { |
56 DCHECK(!track_content_encodings_client_.get()); | 46 DCHECK(!track_content_encodings_client_.get()); |
57 track_content_encodings_client_.reset(new WebMContentEncodingsClient); | 47 track_content_encodings_client_.reset(new WebMContentEncodingsClient); |
58 return track_content_encodings_client_->OnListStart(id); | 48 return track_content_encodings_client_->OnListStart(id); |
59 } | 49 } |
60 | 50 |
61 if (id == kWebMIdTrackEntry) { | 51 if (id == kWebMIdTrackEntry) { |
62 track_type_ = -1; | 52 track_type_ = -1; |
63 track_num_ = -1; | 53 track_num_ = -1; |
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74 } | 64 } |
75 | 65 |
76 if (id == kWebMIdTrackEntry) { | 66 if (id == kWebMIdTrackEntry) { |
77 if (track_type_ == -1 || track_num_ == -1) { | 67 if (track_type_ == -1 || track_num_ == -1) { |
78 DVLOG(1) << "Missing TrackEntry data" | 68 DVLOG(1) << "Missing TrackEntry data" |
79 << " TrackType " << track_type_ | 69 << " TrackType " << track_type_ |
80 << " TrackNum " << track_num_; | 70 << " TrackNum " << track_num_; |
81 return false; | 71 return false; |
82 } | 72 } |
83 | 73 |
84 if (track_type_ == kWebMTrackTypeVideo) { | 74 if (track_type_ != kWebMTrackTypeAudio && |
85 video_track_num_ = track_num_; | 75 track_type_ != kWebMTrackTypeVideo) { |
86 if (track_content_encodings_client_.get()) { | |
87 video_content_encodings_client_ = | |
88 track_content_encodings_client_.Pass(); | |
89 } | |
90 } else if (track_type_ == kWebMTrackTypeAudio) { | |
91 audio_track_num_ = track_num_; | |
92 if (track_content_encodings_client_.get()) { | |
93 audio_content_encodings_client_ = | |
94 track_content_encodings_client_.Pass(); | |
95 } | |
96 } else { | |
97 DVLOG(1) << "Unexpected TrackType " << track_type_; | 76 DVLOG(1) << "Unexpected TrackType " << track_type_; |
98 return false; | 77 return false; |
99 } | 78 } |
100 | 79 |
| 80 std::string encryption_key_id; |
| 81 if (track_content_encodings_client_.get()) { |
| 82 DCHECK(!track_content_encodings_client_->content_encodings().empty()); |
| 83 // If we have multiple ContentEncoding in one track. Always choose the |
| 84 // key id in the first ContentEncoding as the key id of the track. |
| 85 encryption_key_id = track_content_encodings_client_-> |
| 86 content_encodings()[0]->encryption_key_id(); |
| 87 } |
| 88 |
| 89 if (track_type_ == kWebMTrackTypeAudio) { |
| 90 audio_track_num_ = track_num_; |
| 91 audio_encryption_key_id_ = encryption_key_id; |
| 92 } else if (track_type_ == kWebMTrackTypeVideo) { |
| 93 video_track_num_ = track_num_; |
| 94 video_encryption_key_id_ = encryption_key_id; |
| 95 } |
| 96 |
101 track_type_ = -1; | 97 track_type_ = -1; |
102 track_num_ = -1; | 98 track_num_ = -1; |
103 track_content_encodings_client_.reset(); | 99 track_content_encodings_client_.reset(); |
104 return true; | 100 return true; |
105 } | 101 } |
106 | 102 |
107 return true; | 103 return true; |
108 } | 104 } |
109 | 105 |
110 bool WebMTracksParser::OnUInt(int id, int64 val) { | 106 bool WebMTracksParser::OnUInt(int id, int64 val) { |
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141 bool WebMTracksParser::OnString(int id, const std::string& str) { | 137 bool WebMTracksParser::OnString(int id, const std::string& str) { |
142 if (id == kWebMIdCodecID && str != "A_VORBIS" && str != "V_VP8") { | 138 if (id == kWebMIdCodecID && str != "A_VORBIS" && str != "V_VP8") { |
143 DVLOG(1) << "Unexpected CodecID " << str; | 139 DVLOG(1) << "Unexpected CodecID " << str; |
144 return false; | 140 return false; |
145 } | 141 } |
146 | 142 |
147 return true; | 143 return true; |
148 } | 144 } |
149 | 145 |
150 } // namespace media | 146 } // namespace media |
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