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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 importScripts('function_sequence.js'); | 5 importScripts('function_sequence.js'); |
6 importScripts('function_parallel.js'); | 6 importScripts('function_parallel.js'); |
7 | 7 |
8 function Id3Parser(parent) { | 8 function Id3Parser(parent) { |
9 MetadataParser.call(this, parent, 'id3', /\.(mp3)$/i); | 9 MetadataParser.call(this, parent, 'id3', /\.(mp3)$/i); |
10 } | 10 } |
11 | 11 |
12 Id3Parser.prototype = {__proto__: MetadataParser.prototype}; | 12 Id3Parser.prototype = {__proto__: MetadataParser.prototype}; |
13 | 13 |
14 /** | 14 /** |
15 * Reads synchsafe integer. | 15 * Reads synchsafe integer. |
16 * 'SynchSafe' term is taken from id3 documentation. | 16 * 'SynchSafe' term is taken from id3 documentation. |
17 * | 17 * |
| 18 * @private |
18 * @param {ByteReader} reader - reader to use. | 19 * @param {ByteReader} reader - reader to use. |
19 * @param {int} length - bytes to read. | 20 * @param {int} length - bytes to read. |
20 * @return {int} | 21 * @return {int} |
21 */ | 22 */ |
22 Id3Parser.readSynchSafe_ = function(reader, length) { | 23 Id3Parser.readSynchSafe_ = function(reader, length) { |
23 var rv = 0; | 24 var rv = 0; |
24 | 25 |
25 switch (length) { | 26 switch (length) { |
26 case 4: | 27 case 4: |
27 rv = reader.readScalar(1, false) << 21; | 28 rv = reader.readScalar(1, false) << 21; |
28 case 3: | 29 case 3: |
29 rv |= reader.readScalar(1, false) << 14; | 30 rv |= reader.readScalar(1, false) << 14; |
30 case 2: | 31 case 2: |
31 rv |= reader.readScalar(1, false) << 7; | 32 rv |= reader.readScalar(1, false) << 7; |
32 case 1: | 33 case 1: |
33 rv |= reader.readScalar(1, false); | 34 rv |= reader.readScalar(1, false); |
34 } | 35 } |
35 | 36 |
36 return rv; | 37 return rv; |
37 }; | 38 }; |
38 | 39 |
39 /** | 40 /** |
40 * Reads 3bytes integer. | 41 * Reads 3bytes integer. |
41 * | 42 * |
| 43 * @private |
42 * @param {ByteReader} reader - reader to use. | 44 * @param {ByteReader} reader - reader to use. |
43 * @return {int} | 45 * @return {int} |
44 */ | 46 */ |
45 Id3Parser.readUInt24_ = function(reader) { | 47 Id3Parser.readUInt24_ = function(reader) { |
46 return reader.readScalar(2, false) << 16 | reader.readScalar(1, false); | 48 return reader.readScalar(2, false) << 16 | reader.readScalar(1, false); |
47 }; | 49 }; |
48 | 50 |
49 /** | 51 /** |
50 * Reads string from reader with specified encoding | 52 * Reads string from reader with specified encoding |
51 * | 53 * |
| 54 * @private |
52 * @param {ByteReader} reader reader to use. | 55 * @param {ByteReader} reader reader to use. |
53 * @param {int} encoding string encoding. | 56 * @param {int} encoding string encoding. |
54 * @param {int} size maximum string size. Actual result may be shorter. | 57 * @param {int} size maximum string size. Actual result may be shorter. |
55 * | |
56 */ | 58 */ |
57 Id3Parser.prototype.readString_ = function(reader, encoding, size) { | 59 Id3Parser.prototype.readString_ = function(reader, encoding, size) { |
58 switch (encoding) { | 60 switch (encoding) { |
59 case Id3Parser.v2.ENCODING.ISO_8859_1: | 61 case Id3Parser.v2.ENCODING.ISO_8859_1: |
60 return reader.readNullTerminatedString(size); | 62 return reader.readNullTerminatedString(size); |
61 | 63 |
62 case Id3Parser.v2.ENCODING.UTF_16: | 64 case Id3Parser.v2.ENCODING.UTF_16: |
63 return reader.readNullTerminatedStringUTF16(true, size); | 65 return reader.readNullTerminatedStringUTF16(true, size); |
64 | 66 |
65 case Id3Parser.v2.ENCODING.UTF_16BE: | 67 case Id3Parser.v2.ENCODING.UTF_16BE: |
66 return reader.readNullTerminatedStringUTF16(false, size); | 68 return reader.readNullTerminatedStringUTF16(false, size); |
67 | 69 |
68 case Id3Parser.v2.ENCODING.UTF_8: | 70 case Id3Parser.v2.ENCODING.UTF_8: |
69 // TODO: implement UTF_8. | 71 // TODO: implement UTF_8. |
70 this.log('UTF8 encoding not supported, used ISO_8859_1 instead'); | 72 this.log('UTF8 encoding not supported, used ISO_8859_1 instead'); |
71 return reader.readNullTerminatedString(size); | 73 return reader.readNullTerminatedString(size); |
72 | 74 |
73 default: { | 75 default: { |
74 this.log('Unsupported encoding in ID3 tag: ' + encoding); | 76 this.log('Unsupported encoding in ID3 tag: ' + encoding); |
75 return ''; | 77 return ''; |
76 } | 78 } |
77 } | 79 } |
78 }; | 80 }; |
79 | 81 |
80 /** | 82 /** |
81 * Reads text frame from reader. | 83 * Reads text frame from reader. |
82 * | 84 * |
| 85 * @private |
83 * @param {ByteReader} reader reader to use. | 86 * @param {ByteReader} reader reader to use. |
84 * @param {int} majorVersion major id3 version to use. | 87 * @param {int} majorVersion major id3 version to use. |
85 * @param {Object} frame frame so store data at. | 88 * @param {Object} frame frame so store data at. |
86 * @param {int} end frame end position in reader. | 89 * @param {int} end frame end position in reader. |
87 */ | 90 */ |
88 Id3Parser.prototype.readTextFrame_ = function(reader, | 91 Id3Parser.prototype.readTextFrame_ = function(reader, |
89 majorVersion, | 92 majorVersion, |
90 frame, | 93 frame, |
91 end) { | 94 end) { |
92 frame.encoding = reader.readScalar(1, false, end); | 95 frame.encoding = reader.readScalar(1, false, end); |
93 frame.value = this.readString_(reader, frame.encoding, end - reader.tell()); | 96 frame.value = this.readString_(reader, frame.encoding, end - reader.tell()); |
94 }; | 97 }; |
95 | 98 |
96 /** | 99 /** |
97 * Reads user defined text frame from reader. | 100 * Reads user defined text frame from reader. |
98 * | 101 * |
| 102 * @private |
99 * @param {ByteReader} reader reader to use. | 103 * @param {ByteReader} reader reader to use. |
100 * @param {int} majorVersion major id3 version to use. | 104 * @param {int} majorVersion major id3 version to use. |
101 * @param {Object} frame frame so store data at. | 105 * @param {Object} frame frame so store data at. |
102 * @param {int} end frame end position in reader. | 106 * @param {int} end frame end position in reader. |
103 */ | 107 */ |
104 Id3Parser.prototype.readUserDefinedTextFrame_ = function(reader, | 108 Id3Parser.prototype.readUserDefinedTextFrame_ = function(reader, |
105 majorVersion, | 109 majorVersion, |
106 frame, | 110 frame, |
107 end) { | 111 end) { |
108 frame.encoding = reader.readScalar(1, false, end); | 112 frame.encoding = reader.readScalar(1, false, end); |
109 | 113 |
110 frame.description = this.readString_( | 114 frame.description = this.readString_( |
111 reader, | 115 reader, |
112 frame.encoding, | 116 frame.encoding, |
113 end - reader.tell()); | 117 end - reader.tell()); |
114 | 118 |
115 frame.value = this.readString_( | 119 frame.value = this.readString_( |
116 reader, | 120 reader, |
117 frame.encoding, | 121 frame.encoding, |
118 end - reader.tell()); | 122 end - reader.tell()); |
119 }; | 123 }; |
120 | 124 |
| 125 /** |
| 126 * @private |
| 127 */ |
121 Id3Parser.prototype.readPIC_ = function(reader, majorVersion, frame, end) { | 128 Id3Parser.prototype.readPIC_ = function(reader, majorVersion, frame, end) { |
122 frame.encoding = reader.readScalar(1, false, end); | 129 frame.encoding = reader.readScalar(1, false, end); |
123 frame.format = reader.readNullTerminatedString(3, end - reader.tell()); | 130 frame.format = reader.readNullTerminatedString(3, end - reader.tell()); |
124 frame.pictureType = reader.readScalar(1, false, end); | 131 frame.pictureType = reader.readScalar(1, false, end); |
125 frame.description = this.readString_(reader, | 132 frame.description = this.readString_(reader, |
126 frame.encoding, | 133 frame.encoding, |
127 end - reader.tell()); | 134 end - reader.tell()); |
128 | 135 |
129 | 136 |
130 if (frame.format == '-->') { | 137 if (frame.format == '-->') { |
131 frame.imageUrl = reader.readNullTerminatedString(end - reader.tell()); | 138 frame.imageUrl = reader.readNullTerminatedString(end - reader.tell()); |
132 } else { | 139 } else { |
133 frame.imageUrl = reader.readImage(end - reader.tell()); | 140 frame.imageUrl = reader.readImage(end - reader.tell()); |
134 } | 141 } |
135 }; | 142 }; |
136 | 143 |
| 144 /** |
| 145 * @private |
| 146 */ |
137 Id3Parser.prototype.readAPIC_ = function(reader, majorVersion, frame, end) { | 147 Id3Parser.prototype.readAPIC_ = function(reader, majorVersion, frame, end) { |
138 this.vlog('Extracting picture'); | 148 this.vlog('Extracting picture'); |
139 frame.encoding = reader.readScalar(1, false, end); | 149 frame.encoding = reader.readScalar(1, false, end); |
140 frame.mime = reader.readNullTerminatedString(end - reader.tell()); | 150 frame.mime = reader.readNullTerminatedString(end - reader.tell()); |
141 frame.pictureType = reader.readScalar(1, false, end); | 151 frame.pictureType = reader.readScalar(1, false, end); |
142 frame.description = this.readString_( | 152 frame.description = this.readString_( |
143 reader, | 153 reader, |
144 frame.encoding, | 154 frame.encoding, |
145 end - reader.tell()); | 155 end - reader.tell()); |
146 | 156 |
147 if (frame.mime == '-->') { | 157 if (frame.mime == '-->') { |
148 frame.imageUrl = reader.readNullTerminatedString(end - reader.tell()); | 158 frame.imageUrl = reader.readNullTerminatedString(end - reader.tell()); |
149 } else { | 159 } else { |
150 frame.imageUrl = reader.readImage(end - reader.tell()); | 160 frame.imageUrl = reader.readImage(end - reader.tell()); |
151 } | 161 } |
152 }; | 162 }; |
153 | 163 |
154 /** | 164 /** |
155 * Reads string from reader with specified encoding | 165 * Reads string from reader with specified encoding |
156 * | 166 * |
| 167 * @private |
157 * @param {ByteReader} reader reader to use. | 168 * @param {ByteReader} reader reader to use. |
158 * @return {Object} frame read. | 169 * @return {Object} frame read. |
159 */ | 170 */ |
160 Id3Parser.prototype.readFrame_ = function(reader, majorVersion) { | 171 Id3Parser.prototype.readFrame_ = function(reader, majorVersion) { |
161 if (reader.eof()) | 172 if (reader.eof()) |
162 return null; | 173 return null; |
163 | 174 |
164 var frame = {}; | 175 var frame = {}; |
165 | 176 |
166 reader.pushSeek(reader.tell(), ByteReader.SEEK_BEG); | 177 reader.pushSeek(reader.tell(), ByteReader.SEEK_BEG); |
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669 TYER: 'ID3_YEAR', | 680 TYER: 'ID3_YEAR', |
670 WCOP: 'ID3_COPYRIGHT', | 681 WCOP: 'ID3_COPYRIGHT', |
671 WOAF: 'ID3_OFFICIAL_AUDIO_FILE_WEBPAGE', | 682 WOAF: 'ID3_OFFICIAL_AUDIO_FILE_WEBPAGE', |
672 WOAR: 'ID3_OFFICIAL_ARTIST', | 683 WOAR: 'ID3_OFFICIAL_ARTIST', |
673 WOAS: 'ID3_OFFICIAL_AUDIO_SOURCE_WEBPAGE', | 684 WOAS: 'ID3_OFFICIAL_AUDIO_SOURCE_WEBPAGE', |
674 WPUB: 'ID3_PUBLISHERS_OFFICIAL_WEBPAGE' | 685 WPUB: 'ID3_PUBLISHERS_OFFICIAL_WEBPAGE' |
675 } | 686 } |
676 }; | 687 }; |
677 | 688 |
678 MetadataDispatcher.registerParserClass(Id3Parser); | 689 MetadataDispatcher.registerParserClass(Id3Parser); |
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