mambax7 /
xoopseditors
| Total Complexity | 49 |
| Total Lines | 491 |
| Duplicated Lines | 0 % |
| Changes | 1 | ||
| Bugs | 0 | Features | 0 |
Complex classes like getid3_midi often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use getid3_midi, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 24 | class getid3_midi extends getid3_handler |
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| 25 | { |
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| 26 | |||
| 27 | public function Analyze() |
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| 28 | { |
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| 29 | $getid3 = $this->getid3; |
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| 30 | |||
| 31 | $getid3->info['midi']['raw'] = []; |
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| 32 | $info_midi = &$getid3->info['midi']; |
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| 33 | $info_midi_raw = &$info_midi['raw']; |
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| 34 | |||
| 35 | $getid3->info['fileformat'] = 'midi'; |
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| 36 | $getid3->info['audio']['dataformat'] = 'midi'; |
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| 37 | |||
| 38 | fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET); |
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| 39 | $midi_data = fread($getid3->fp, getid3::FREAD_BUFFER_SIZE); |
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| 40 | |||
| 41 | // Magic bytes: 'MThd' |
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| 42 | |||
| 43 | getid3_lib::ReadSequence( |
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| 44 | 'BigEndian2Int', |
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| 45 | $info_midi_raw, |
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| 46 | $midi_data, |
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| 47 | 4, |
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| 48 | [ |
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| 49 | 'headersize' => 4, |
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| 50 | 'fileformat' => 2, |
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| 51 | 'tracks' => 2, |
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| 52 | 'ticksperqnote' => 2 |
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| 53 | ] |
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| 54 | ); |
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| 55 | |||
| 56 | $offset = 14; |
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| 57 | |||
| 58 | for ($i = 0; $i < $info_midi_raw['tracks']; $i++) { |
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| 59 | if ((strlen($midi_data) - $offset) < 8) { |
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| 60 | $midi_data .= fread($getid3->fp, getid3::FREAD_BUFFER_SIZE); |
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| 61 | } |
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| 62 | |||
| 63 | $track_id = substr($midi_data, $offset, 4); |
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| 64 | $offset += 4; |
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| 65 | |||
| 66 | if ('MTrk' != $track_id) { |
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| 67 | throw new getid3_exception('Expecting "MTrk" at ' . $offset . ', found ' . $track_id . ' instead'); |
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| 68 | } |
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| 69 | |||
| 70 | $track_size = getid3_lib::BigEndian2Int(substr($midi_data, $offset, 4)); |
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| 71 | $offset += 4; |
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| 72 | |||
| 73 | $track_data_array[$i] = substr($midi_data, $offset, $track_size); |
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| 74 | $offset += $track_size; |
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| 75 | } |
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| 76 | |||
| 77 | if (!isset($track_data_array) || !is_array($track_data_array)) { |
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|
Comprehensibility
Best Practice
introduced
by
|
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| 78 | throw new getid3_exception('Cannot find MIDI track information'); |
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| 79 | } |
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| 80 | |||
| 81 | $info_midi['totalticks'] = 0; |
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| 82 | $getid3->info['playtime_seconds'] = 0; |
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| 83 | $current_ms_per_beat = 500000; // 120 beats per minute; 60,000,000 microseconds per minute -> 500,000 microseconds per beat |
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| 84 | $current_beats_per_min = 120; // 120 beats per minute; 60,000,000 microseconds per minute -> 500,000 microseconds per beat |
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| 85 | $ms_per_quarter_note_after = []; |
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| 86 | |||
| 87 | foreach ($track_data_array as $track_number => $track_data) { |
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| 88 | $events_offset = $last_issued_midi_command = $last_issued_midi_channel = $cumulative_delta_time = $ticks_at_current_bpm = 0; |
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| 89 | |||
| 90 | while ($events_offset < strlen($track_data)) { |
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| 91 | $event_id = 0; |
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| 92 | if (isset($midi_events[$track_number]) && is_array($midi_events[$track_number])) { |
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| 93 | $event_id = count($midi_events[$track_number]); |
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| 94 | } |
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| 95 | $delta_time = 0; |
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| 96 | for ($i = 0; $i < 4; $i++) { |
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| 97 | $delta_time_byte = ord($track_data{$events_offset++}); |
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| 98 | $delta_time = ($delta_time << 7) + ($delta_time_byte & 0x7F); |
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| 99 | if ($delta_time_byte & 0x80) { |
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| 100 | // another byte follows |
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| 101 | } else { |
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| 102 | break; |
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| 103 | } |
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| 104 | } |
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| 105 | |||
| 106 | $cumulative_delta_time += $delta_time; |
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| 107 | $ticks_at_current_bpm += $delta_time; |
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| 108 | |||
| 109 | $midi_events[$track_number][$event_id]['deltatime'] = $delta_time; |
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| 110 | |||
| 111 | $midi_event_channel = ord($track_data{$events_offset++}); |
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| 112 | |||
| 113 | // OK, normal event - MIDI command has MSB set |
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| 114 | if ($midi_event_channel & 0x80) { |
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| 115 | $last_issued_midi_command = $midi_event_channel >> 4; |
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| 116 | $last_issued_midi_channel = $midi_event_channel & 0x0F; |
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| 117 | } // Running event - assume last command |
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| 118 | else { |
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| 119 | $events_offset--; |
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| 120 | } |
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| 121 | |||
| 122 | $midi_events[$track_number][$event_id]['eventid'] = $last_issued_midi_command; |
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| 123 | $midi_events[$track_number][$event_id]['channel'] = $last_issued_midi_channel; |
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| 124 | |||
| 125 | switch ($midi_events[$track_number][$event_id]['eventid']) { |
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| 126 | case 0x8: // Note off (key is released) |
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| 127 | case 0x9: // Note on (key is pressed) |
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| 128 | case 0xA: // Key after-touch |
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| 129 | |||
| 130 | //$notenumber = ord($track_data{$events_offset++}); |
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| 131 | //$velocity = ord($track_data{$events_offset++}); |
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| 132 | $events_offset += 2; |
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| 133 | break; |
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| 134 | |||
| 135 | case 0xB: // Control Change |
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| 136 | |||
| 137 | //$controllernum = ord($track_data{$events_offset++}); |
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| 138 | //$newvalue = ord($track_data{$events_offset++}); |
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| 139 | $events_offset += 2; |
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| 140 | break; |
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| 141 | |||
| 142 | case 0xC: // Program (patch) change |
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| 143 | |||
| 144 | $new_program_num = ord($track_data{$events_offset++}); |
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| 145 | |||
| 146 | $info_midi_raw['track'][$track_number]['instrumentid'] = $new_program_num; |
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| 147 | $info_midi_raw['track'][$track_number]['instrument'] = 10 == $track_number ? getid3_midi::GeneralMIDIpercussionLookup($new_program_num) : getid3_midi::GeneralMIDIinstrumentLookup($new_program_num); |
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| 148 | break; |
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| 149 | |||
| 150 | case 0xD: // Channel after-touch |
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| 151 | |||
| 152 | //$channelnumber = ord($track_data{$events_offset++}); |
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| 153 | break; |
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| 154 | |||
| 155 | case 0xE: // Pitch wheel change (2000H is normal or no change) |
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| 156 | |||
| 157 | //$changeLSB = ord($track_data{$events_offset++}); |
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| 158 | //$changeMSB = ord($track_data{$events_offset++}); |
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| 159 | //$pitchwheelchange = (($changeMSB & 0x7F) << 7) & ($changeLSB & 0x7F); |
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| 160 | $events_offset += 2; |
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| 161 | break; |
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| 162 | |||
| 163 | case 0xF: |
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| 164 | |||
| 165 | if (0xF == $midi_events[$track_number][$event_id]['channel']) { |
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| 166 | $meta_event_command = ord($track_data{$events_offset++}); |
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| 167 | $meta_event_length = ord($track_data{$events_offset++}); |
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| 168 | $meta_event_data = substr($track_data, $events_offset, $meta_event_length); |
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| 169 | $events_offset += $meta_event_length; |
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| 170 | |||
| 171 | switch ($meta_event_command) { |
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| 172 | case 0x00: // Set track sequence number |
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| 173 | |||
| 174 | //$track_sequence_number = getid3_lib::BigEndian2Int(substr($meta_event_data, 0, $meta_event_length)); |
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| 175 | //$info_midi_raw['events'][$track_number][$event_id]['seqno'] = $track_sequence_number; |
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| 176 | break; |
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| 177 | |||
| 178 | case 0x01: // Text: generic |
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| 179 | |||
| 180 | $text_generic = substr($meta_event_data, 0, $meta_event_length); |
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| 181 | //$info_midi_raw['events'][$track_number][$event_id]['text'] = $text_generic; |
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| 182 | $info_midi['comments']['comment'][] = $text_generic; |
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| 183 | break; |
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| 184 | |||
| 185 | case 0x02: // Text: copyright |
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| 186 | |||
| 187 | $text_copyright = substr($meta_event_data, 0, $meta_event_length); |
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| 188 | //$info_midi_raw['events'][$track_number][$event_id]['copyright'] = $text_copyright; |
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| 189 | $info_midi['comments']['copyright'][] = $text_copyright; |
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| 190 | break; |
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| 191 | |||
| 192 | case 0x03: // Text: track name |
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| 193 | |||
| 194 | $text_trackname = substr($meta_event_data, 0, $meta_event_length); |
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| 195 | $info_midi_raw['track'][$track_number]['name'] = $text_trackname; |
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| 196 | break; |
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| 197 | |||
| 198 | case 0x04: // Text: track instrument name |
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| 199 | |||
| 200 | //$text_instrument = substr($meta_event_data, 0, $meta_event_length); |
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| 201 | //$info_midi_raw['events'][$track_number][$event_id]['instrument'] = $text_instrument; |
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| 202 | break; |
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| 203 | |||
| 204 | case 0x05: // Text: lyrics |
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| 205 | |||
| 206 | $text_lyrics = substr($meta_event_data, 0, $meta_event_length); |
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| 207 | //$info_midi_raw['events'][$track_number][$event_id]['lyrics'] = $text_lyrics; |
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| 208 | if (!isset($info_midi['lyrics'])) { |
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| 209 | $info_midi['lyrics'] = ''; |
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| 210 | } |
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| 211 | $info_midi['lyrics'] .= $text_lyrics . "\n"; |
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| 212 | break; |
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| 213 | |||
| 214 | case 0x06: // Text: marker |
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| 215 | |||
| 216 | //$text_marker = substr($meta_event_data, 0, $meta_event_length); |
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| 217 | //$info_midi_raw['events'][$track_number][$event_id]['marker'] = $text_marker; |
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| 218 | break; |
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| 219 | |||
| 220 | case 0x07: // Text: cue point |
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| 221 | |||
| 222 | //$text_cuepoint = substr($meta_event_data, 0, $meta_event_length); |
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| 223 | //$info_midi_raw['events'][$track_number][$event_id]['cuepoint'] = $text_cuepoint; |
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| 224 | break; |
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| 225 | |||
| 226 | case 0x2F: // End Of Track |
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| 227 | |||
| 228 | //$info_midi_raw['events'][$track_number][$event_id]['EOT'] = $cumulative_delta_time; |
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| 229 | break; |
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| 230 | |||
| 231 | case 0x51: // Tempo: microseconds / quarter note |
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| 232 | |||
| 233 | $current_ms_per_beat = getid3_lib::BigEndian2Int(substr($meta_event_data, 0, $meta_event_length)); |
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| 234 | $info_midi_raw['events'][$track_number][$cumulative_delta_time]['us_qnote'] = $current_ms_per_beat; |
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| 235 | $current_beats_per_min = (1000000 / $current_ms_per_beat) * 60; |
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| 236 | $ms_per_quarter_note_after[$cumulative_delta_time] = $current_ms_per_beat; |
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| 237 | $ticks_at_current_bpm = 0; |
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| 238 | break; |
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| 239 | |||
| 240 | case 0x58: // Time signature |
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| 241 | $timesig_numerator = getid3_lib::BigEndian2Int($meta_event_data[0]); |
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| 242 | $timesig_denominator = pow(2, getid3_lib::BigEndian2Int($meta_event_data[1])); // $02 -> x/4, $03 -> x/8, etc |
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| 243 | //$timesig_32inqnote = getid3_lib::BigEndian2Int($meta_event_data[2]); // number of 32nd notes to the quarter note |
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| 244 | //$info_midi_raw['events'][$track_number][$event_id]['timesig_32inqnote'] = $timesig_32inqnote; |
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| 245 | //$info_midi_raw['events'][$track_number][$event_id]['timesig_numerator'] = $timesig_numerator; |
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| 246 | //$info_midi_raw['events'][$track_number][$event_id]['timesig_denominator'] = $timesig_denominator; |
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| 247 | //$info_midi_raw['events'][$track_number][$event_id]['timesig_text'] = $timesig_numerator.'/'.$timesig_denominator; |
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| 248 | $info_midi['timesignature'][] = $timesig_numerator . '/' . $timesig_denominator; |
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| 249 | break; |
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| 250 | |||
| 251 | case 0x59: // Keysignature |
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| 252 | |||
| 253 | $keysig_sharpsflats = getid3_lib::BigEndian2Int($meta_event_data{0}); |
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| 254 | if ($keysig_sharpsflats & 0x80) { |
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| 255 | // (-7 -> 7 flats, 0 ->key of C, 7 -> 7 sharps) |
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| 256 | $keysig_sharpsflats -= 256; |
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| 257 | } |
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| 258 | |||
| 259 | $keysig_majorminor = getid3_lib::BigEndian2Int($meta_event_data{1}); // 0 -> major, 1 -> minor |
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| 260 | $keysigs = [-7 => 'Cb', -6 => 'Gb', -5 => 'Db', -4 => 'Ab', -3 => 'Eb', -2 => 'Bb', -1 => 'F', 0 => 'C', 1 => 'G', 2 => 'D', 3 => 'A', 4 => 'E', 5 => 'B', 6 => 'F#', 7 => 'C#']; |
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| 261 | //$info_midi_raw['events'][$track_number][$event_id]['keysig_sharps'] = (($keysig_sharpsflats > 0) ? abs($keysig_sharpsflats) : 0); |
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| 262 | //$info_midi_raw['events'][$track_number][$event_id]['keysig_flats'] = (($keysig_sharpsflats < 0) ? abs($keysig_sharpsflats) : 0); |
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| 263 | //$info_midi_raw['events'][$track_number][$event_id]['keysig_minor'] = (bool)$keysig_majorminor; |
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| 264 | //$info_midi_raw['events'][$track_number][$event_id]['keysig_text'] = $keysigs[$keysig_sharpsflats].' '.($info_midi_raw['events'][$track_number][$event_id]['keysig_minor'] ? 'minor' : 'major'); |
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| 265 | |||
| 266 | // $keysigs[$keysig_sharpsflats] gets an int key (correct) - $keysigs["$keysig_sharpsflats"] gets a string key (incorrect) |
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| 267 | $info_midi['keysignature'][] = $keysigs[$keysig_sharpsflats] . ' ' . ((bool)$keysig_majorminor ? 'minor' : 'major'); |
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| 268 | break; |
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| 269 | |||
| 270 | case 0x7F: // Sequencer specific information |
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| 271 | |||
| 272 | $custom_data = substr($meta_event_data, 0, $meta_event_length); |
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| 273 | break; |
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| 274 | |||
| 275 | default: |
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| 276 | |||
| 277 | $getid3->warning('Unhandled META Event Command: ' . $meta_event_command); |
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| 278 | } |
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| 279 | } |
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| 280 | break; |
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| 281 | |||
| 282 | default: |
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| 283 | $getid3->warning('Unhandled MIDI Event ID: ' . $midi_events[$track_number][$event_id]['eventid']); |
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| 284 | } |
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| 285 | } |
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| 286 | |||
| 287 | if (($track_number > 0) || (1 == count($track_data_array))) { |
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| 288 | $info_midi['totalticks'] = max($info_midi['totalticks'], $cumulative_delta_time); |
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| 289 | } |
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| 290 | } |
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| 291 | |||
| 292 | $previous_tick_offset = null; |
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| 293 | |||
| 294 | ksort($ms_per_quarter_note_after); |
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| 295 | foreach ($ms_per_quarter_note_after as $tick_offset => $ms_per_beat) { |
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| 296 | if (is_null($previous_tick_offset)) { |
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| 297 | $prev_ms_per_beat = $ms_per_beat; |
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| 298 | $previous_tick_offset = $tick_offset; |
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| 299 | continue; |
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| 300 | } |
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| 301 | |||
| 302 | if ($info_midi['totalticks'] > $tick_offset) { |
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| 303 | $getid3->info['playtime_seconds'] += (($tick_offset - $previous_tick_offset) / $info_midi_raw['ticksperqnote']) * ($prev_ms_per_beat / 1000000); |
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| 304 | |||
| 305 | $prev_ms_per_beat = $ms_per_beat; |
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| 306 | $previous_tick_offset = $tick_offset; |
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| 307 | } |
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| 308 | } |
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| 309 | |||
| 310 | if ($info_midi['totalticks'] > $previous_tick_offset) { |
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| 311 | $getid3->info['playtime_seconds'] += (($info_midi['totalticks'] - $previous_tick_offset) / $info_midi_raw['ticksperqnote']) * ($ms_per_beat / 1000000); |
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| 312 | } |
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| 313 | |||
| 314 | if (@$getid3->info['playtime_seconds'] > 0) { |
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| 315 | $getid3->info['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['playtime_seconds']; |
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| 316 | } |
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| 317 | |||
| 318 | if (!empty($info_midi['lyrics'])) { |
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| 319 | $info_midi['comments']['lyrics'][] = $info_midi['lyrics']; |
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| 320 | } |
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| 321 | |||
| 322 | return true; |
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| 323 | } |
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| 324 | |||
| 325 | public static function GeneralMIDIinstrumentLookup($instrument_id) |
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| 326 | { |
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| 327 | static $lookup = [ |
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| 328 | |||
| 329 | 0 => 'Acoustic Grand', |
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| 330 | 1 => 'Bright Acoustic', |
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| 331 | 2 => 'Electric Grand', |
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| 332 | 3 => 'Honky-Tonk', |
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| 333 | 4 => 'Electric Piano 1', |
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| 334 | 5 => 'Electric Piano 2', |
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| 335 | 6 => 'Harpsichord', |
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| 336 | 7 => 'Clavier', |
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| 337 | 8 => 'Celesta', |
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| 338 | 9 => 'Glockenspiel', |
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| 339 | 10 => 'Music Box', |
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| 340 | 11 => 'Vibraphone', |
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| 341 | 12 => 'Marimba', |
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| 342 | 13 => 'Xylophone', |
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| 343 | 14 => 'Tubular Bells', |
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| 344 | 15 => 'Dulcimer', |
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| 345 | 16 => 'Drawbar Organ', |
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| 346 | 17 => 'Percussive Organ', |
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| 347 | 18 => 'Rock Organ', |
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| 348 | 19 => 'Church Organ', |
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| 349 | 20 => 'Reed Organ', |
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| 350 | 21 => 'Accordian', |
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| 351 | 22 => 'Harmonica', |
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| 352 | 23 => 'Tango Accordian', |
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| 353 | 24 => 'Acoustic Guitar (nylon)', |
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| 354 | 25 => 'Acoustic Guitar (steel)', |
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| 355 | 26 => 'Electric Guitar (jazz)', |
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| 356 | 27 => 'Electric Guitar (clean)', |
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| 357 | 28 => 'Electric Guitar (muted)', |
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| 358 | 29 => 'Overdriven Guitar', |
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| 359 | 30 => 'Distortion Guitar', |
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| 360 | 31 => 'Guitar Harmonics', |
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| 361 | 32 => 'Acoustic Bass', |
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| 362 | 33 => 'Electric Bass (finger)', |
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| 363 | 34 => 'Electric Bass (pick)', |
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| 364 | 35 => 'Fretless Bass', |
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| 365 | 36 => 'Slap Bass 1', |
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| 366 | 37 => 'Slap Bass 2', |
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| 367 | 38 => 'Synth Bass 1', |
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| 368 | 39 => 'Synth Bass 2', |
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| 369 | 40 => 'Violin', |
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| 370 | 41 => 'Viola', |
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| 371 | 42 => 'Cello', |
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| 372 | 43 => 'Contrabass', |
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| 373 | 44 => 'Tremolo Strings', |
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| 374 | 45 => 'Pizzicato Strings', |
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| 375 | 46 => 'Orchestral Strings', |
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| 376 | 47 => 'Timpani', |
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| 377 | 48 => 'String Ensemble 1', |
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| 378 | 49 => 'String Ensemble 2', |
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| 379 | 50 => 'SynthStrings 1', |
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| 380 | 51 => 'SynthStrings 2', |
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| 381 | 52 => 'Choir Aahs', |
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| 382 | 53 => 'Voice Oohs', |
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| 383 | 54 => 'Synth Voice', |
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| 384 | 55 => 'Orchestra Hit', |
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| 385 | 56 => 'Trumpet', |
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| 386 | 57 => 'Trombone', |
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| 387 | 58 => 'Tuba', |
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| 388 | 59 => 'Muted Trumpet', |
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| 389 | 60 => 'French Horn', |
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| 390 | 61 => 'Brass Section', |
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| 391 | 62 => 'SynthBrass 1', |
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| 392 | 63 => 'SynthBrass 2', |
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| 393 | 64 => 'Soprano Sax', |
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| 394 | 65 => 'Alto Sax', |
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| 395 | 66 => 'Tenor Sax', |
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| 396 | 67 => 'Baritone Sax', |
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| 397 | 68 => 'Oboe', |
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| 398 | 69 => 'English Horn', |
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| 399 | 70 => 'Bassoon', |
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| 400 | 71 => 'Clarinet', |
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| 401 | 72 => 'Piccolo', |
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| 402 | 73 => 'Flute', |
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| 403 | 74 => 'Recorder', |
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| 404 | 75 => 'Pan Flute', |
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| 405 | 76 => 'Blown Bottle', |
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| 406 | 77 => 'Shakuhachi', |
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| 407 | 78 => 'Whistle', |
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| 408 | 79 => 'Ocarina', |
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| 409 | 80 => 'Lead 1 (square)', |
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| 410 | 81 => 'Lead 2 (sawtooth)', |
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| 411 | 82 => 'Lead 3 (calliope)', |
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| 412 | 83 => 'Lead 4 (chiff)', |
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| 413 | 84 => 'Lead 5 (charang)', |
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| 414 | 85 => 'Lead 6 (voice)', |
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| 415 | 86 => 'Lead 7 (fifths)', |
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| 416 | 87 => 'Lead 8 (bass + lead)', |
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| 417 | 88 => 'Pad 1 (new age)', |
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| 418 | 89 => 'Pad 2 (warm)', |
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| 419 | 90 => 'Pad 3 (polysynth)', |
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| 420 | 91 => 'Pad 4 (choir)', |
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| 421 | 92 => 'Pad 5 (bowed)', |
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| 422 | 93 => 'Pad 6 (metallic)', |
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| 423 | 94 => 'Pad 7 (halo)', |
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| 424 | 95 => 'Pad 8 (sweep)', |
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| 425 | 96 => 'FX 1 (rain)', |
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| 426 | 97 => 'FX 2 (soundtrack)', |
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| 427 | 98 => 'FX 3 (crystal)', |
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| 428 | 99 => 'FX 4 (atmosphere)', |
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| 429 | 100 => 'FX 5 (brightness)', |
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| 430 | 101 => 'FX 6 (goblins)', |
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| 431 | 102 => 'FX 7 (echoes)', |
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| 432 | 103 => 'FX 8 (sci-fi)', |
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| 433 | 104 => 'Sitar', |
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| 434 | 105 => 'Banjo', |
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| 435 | 106 => 'Shamisen', |
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| 436 | 107 => 'Koto', |
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| 437 | 108 => 'Kalimba', |
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| 438 | 109 => 'Bagpipe', |
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| 439 | 110 => 'Fiddle', |
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| 440 | 111 => 'Shanai', |
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| 441 | 112 => 'Tinkle Bell', |
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| 442 | 113 => 'Agogo', |
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| 443 | 114 => 'Steel Drums', |
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| 444 | 115 => 'Woodblock', |
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| 445 | 116 => 'Taiko Drum', |
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| 446 | 117 => 'Melodic Tom', |
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| 447 | 118 => 'Synth Drum', |
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| 448 | 119 => 'Reverse Cymbal', |
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| 449 | 120 => 'Guitar Fret Noise', |
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| 450 | 121 => 'Breath Noise', |
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| 451 | 122 => 'Seashore', |
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| 452 | 123 => 'Bird Tweet', |
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| 453 | 124 => 'Telephone Ring', |
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| 454 | 125 => 'Helicopter', |
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| 455 | 126 => 'Applause', |
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| 456 | 127 => 'Gunshot' |
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| 457 | ]; |
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| 458 | |||
| 459 | return @$lookup[$instrument_id]; |
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| 460 | } |
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| 461 | |||
| 462 | public static function GeneralMIDIpercussionLookup($instrument_id) |
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| 515 | } |
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| 516 | |||
| 517 | } |
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| 520 |
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