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Diffstat (limited to 'getid3/module.audio.midi.php')
| -rw-r--r-- | getid3/module.audio.midi.php | 522 |
1 files changed, 522 insertions, 0 deletions
diff --git a/getid3/module.audio.midi.php b/getid3/module.audio.midi.php new file mode 100644 index 0000000..0fd7c9b --- /dev/null +++ b/getid3/module.audio.midi.php @@ -0,0 +1,522 @@ +<?php +///////////////////////////////////////////////////////////////// +/// getID3() by James Heinrich <info@getid3.org> // +// available at http://getid3.sourceforge.net // +// or http://www.getid3.org // +///////////////////////////////////////////////////////////////// +// See readme.txt for more details // +///////////////////////////////////////////////////////////////// +// // +// module.audio.midi.php // +// module for Midi Audio files // +// dependencies: NONE // +// /// +///////////////////////////////////////////////////////////////// + + +class getid3_midi +{ + + function getid3_midi(&$fd, &$ThisFileInfo, $scanwholefile=true) { + + // shortcut + $ThisFileInfo['midi']['raw'] = array(); + $thisfile_midi = &$ThisFileInfo['midi']; + $thisfile_midi_raw = &$thisfile_midi['raw']; + + $ThisFileInfo['fileformat'] = 'midi'; + $ThisFileInfo['audio']['dataformat'] = 'midi'; + + fseek($fd, $ThisFileInfo['avdataoffset'], SEEK_SET); + $MIDIdata = fread($fd, GETID3_FREAD_BUFFER_SIZE); + $offset = 0; + $MIDIheaderID = substr($MIDIdata, $offset, 4); // 'MThd' + if ($MIDIheaderID != 'MThd') { + $ThisFileInfo['error'][] = 'Expecting "MThd" at offset '.$ThisFileInfo['avdataoffset'].', found "'.$MIDIheaderID.'"'; + unset($ThisFileInfo['fileformat']); + return false; + } + $offset += 4; + $thisfile_midi_raw['headersize'] = getid3_lib::BigEndian2Int(substr($MIDIdata, $offset, 4)); + $offset += 4; + $thisfile_midi_raw['fileformat'] = getid3_lib::BigEndian2Int(substr($MIDIdata, $offset, 2)); + $offset += 2; + $thisfile_midi_raw['tracks'] = getid3_lib::BigEndian2Int(substr($MIDIdata, $offset, 2)); + $offset += 2; + $thisfile_midi_raw['ticksperqnote'] = getid3_lib::BigEndian2Int(substr($MIDIdata, $offset, 2)); + $offset += 2; + + for ($i = 0; $i < $thisfile_midi_raw['tracks']; $i++) { + if ((strlen($MIDIdata) - $offset) < 8) { + $MIDIdata .= fread($fd, GETID3_FREAD_BUFFER_SIZE); + } + $trackID = substr($MIDIdata, $offset, 4); + $offset += 4; + if ($trackID == 'MTrk') { + $tracksize = getid3_lib::BigEndian2Int(substr($MIDIdata, $offset, 4)); + $offset += 4; + // $thisfile_midi['tracks'][$i]['size'] = $tracksize; + $trackdataarray[$i] = substr($MIDIdata, $offset, $tracksize); + $offset += $tracksize; + } else { + $ThisFileInfo['error'][] = 'Expecting "MTrk" at '.$offset.', found '.$trackID.' instead'; + return false; + } + } + + if (!isset($trackdataarray) || !is_array($trackdataarray)) { + $ThisFileInfo['error'][] = 'Cannot find MIDI track information'; + unset($thisfile_midi); + unset($ThisFileInfo['fileformat']); + return false; + } + + if ($scanwholefile) { // this can take quite a long time, so have the option to bypass it if speed is very important + $thisfile_midi['totalticks'] = 0; + $ThisFileInfo['playtime_seconds'] = 0; + $CurrentMicroSecondsPerBeat = 500000; // 120 beats per minute; 60,000,000 microseconds per minute -> 500,000 microseconds per beat + $CurrentBeatsPerMinute = 120; // 120 beats per minute; 60,000,000 microseconds per minute -> 500,000 microseconds per beat + $MicroSecondsPerQuarterNoteAfter = array (); + + foreach ($trackdataarray as $tracknumber => $trackdata) { + + $eventsoffset = 0; + $LastIssuedMIDIcommand = 0; + $LastIssuedMIDIchannel = 0; + $CumulativeDeltaTime = 0; + $TicksAtCurrentBPM = 0; + while ($eventsoffset < strlen($trackdata)) { + $eventid = 0; + if (isset($MIDIevents[$tracknumber]) && is_array($MIDIevents[$tracknumber])) { + $eventid = count($MIDIevents[$tracknumber]); + } + $deltatime = 0; + for ($i = 0; $i < 4; $i++) { + $deltatimebyte = ord(substr($trackdata, $eventsoffset++, 1)); + $deltatime = ($deltatime << 7) + ($deltatimebyte & 0x7F); + if ($deltatimebyte & 0x80) { + // another byte follows + } else { + break; + } + } + $CumulativeDeltaTime += $deltatime; + $TicksAtCurrentBPM += $deltatime; + $MIDIevents[$tracknumber][$eventid]['deltatime'] = $deltatime; + $MIDI_event_channel = ord(substr($trackdata, $eventsoffset++, 1)); + if ($MIDI_event_channel & 0x80) { + // OK, normal event - MIDI command has MSB set + $LastIssuedMIDIcommand = $MIDI_event_channel >> 4; + $LastIssuedMIDIchannel = $MIDI_event_channel & 0x0F; + } else { + // running event - assume last command + $eventsoffset--; + } + $MIDIevents[$tracknumber][$eventid]['eventid'] = $LastIssuedMIDIcommand; + $MIDIevents[$tracknumber][$eventid]['channel'] = $LastIssuedMIDIchannel; + if ($MIDIevents[$tracknumber][$eventid]['eventid'] == 0x08) { // Note off (key is released) + + $notenumber = ord(substr($trackdata, $eventsoffset++, 1)); + $velocity = ord(substr($trackdata, $eventsoffset++, 1)); + + } elseif ($MIDIevents[$tracknumber][$eventid]['eventid'] == 0x09) { // Note on (key is pressed) + + $notenumber = ord(substr($trackdata, $eventsoffset++, 1)); + $velocity = ord(substr($trackdata, $eventsoffset++, 1)); + + } elseif ($MIDIevents[$tracknumber][$eventid]['eventid'] == 0x0A) { // Key after-touch + + $notenumber = ord(substr($trackdata, $eventsoffset++, 1)); + $velocity = ord(substr($trackdata, $eventsoffset++, 1)); + + } elseif ($MIDIevents[$tracknumber][$eventid]['eventid'] == 0x0B) { // Control Change + + $controllernum = ord(substr($trackdata, $eventsoffset++, 1)); + $newvalue = ord(substr($trackdata, $eventsoffset++, 1)); + + } elseif ($MIDIevents[$tracknumber][$eventid]['eventid'] == 0x0C) { // Program (patch) change + + $newprogramnum = ord(substr($trackdata, $eventsoffset++, 1)); + + $thisfile_midi_raw['track'][$tracknumber]['instrumentid'] = $newprogramnum; + if ($tracknumber == 10) { + $thisfile_midi_raw['track'][$tracknumber]['instrument'] = $this->GeneralMIDIpercussionLookup($newprogramnum); + } else { + $thisfile_midi_raw['track'][$tracknumber]['instrument'] = $this->GeneralMIDIinstrumentLookup($newprogramnum); + } + + } elseif ($MIDIevents[$tracknumber][$eventid]['eventid'] == 0x0D) { // Channel after-touch + + $channelnumber = ord(substr($trackdata, $eventsoffset++, 1)); + + } elseif ($MIDIevents[$tracknumber][$eventid]['eventid'] == 0x0E) { // Pitch wheel change (2000H is normal or no change) + + $changeLSB = ord(substr($trackdata, $eventsoffset++, 1)); + $changeMSB = ord(substr($trackdata, $eventsoffset++, 1)); + $pitchwheelchange = (($changeMSB & 0x7F) << 7) & ($changeLSB & 0x7F); + + } elseif (($MIDIevents[$tracknumber][$eventid]['eventid'] == 0x0F) && ($MIDIevents[$tracknumber][$eventid]['channel'] == 0x0F)) { + + $METAeventCommand = ord(substr($trackdata, $eventsoffset++, 1)); + $METAeventLength = ord(substr($trackdata, $eventsoffset++, 1)); + $METAeventData = substr($trackdata, $eventsoffset, $METAeventLength); + $eventsoffset += $METAeventLength; + switch ($METAeventCommand) { + case 0x00: // Set track sequence number + $track_sequence_number = getid3_lib::BigEndian2Int(substr($METAeventData, 0, $METAeventLength)); + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['seqno'] = $track_sequence_number; + break; + + case 0x01: // Text: generic + $text_generic = substr($METAeventData, 0, $METAeventLength); + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['text'] = $text_generic; + $thisfile_midi['comments']['comment'][] = $text_generic; + break; + + case 0x02: // Text: copyright + $text_copyright = substr($METAeventData, 0, $METAeventLength); + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['copyright'] = $text_copyright; + $thisfile_midi['comments']['copyright'][] = $text_copyright; + break; + + case 0x03: // Text: track name + $text_trackname = substr($METAeventData, 0, $METAeventLength); + $thisfile_midi_raw['track'][$tracknumber]['name'] = $text_trackname; + break; + + case 0x04: // Text: track instrument name + $text_instrument = substr($METAeventData, 0, $METAeventLength); + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['instrument'] = $text_instrument; + break; + + case 0x05: // Text: lyrics + $text_lyrics = substr($METAeventData, 0, $METAeventLength); + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['lyrics'] = $text_lyrics; + if (!isset($thisfile_midi['lyrics'])) { + $thisfile_midi['lyrics'] = ''; + } + $thisfile_midi['lyrics'] .= $text_lyrics."\n"; + break; + + case 0x06: // Text: marker + $text_marker = substr($METAeventData, 0, $METAeventLength); + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['marker'] = $text_marker; + break; + + case 0x07: // Text: cue point + $text_cuepoint = substr($METAeventData, 0, $METAeventLength); + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['cuepoint'] = $text_cuepoint; + break; + + case 0x2F: // End Of Track + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['EOT'] = $CumulativeDeltaTime; + break; + + case 0x51: // Tempo: microseconds / quarter note + $CurrentMicroSecondsPerBeat = getid3_lib::BigEndian2Int(substr($METAeventData, 0, $METAeventLength)); + if ($CurrentMicroSecondsPerBeat == 0) { + $ThisFileInfo['error'][] = 'Corrupt MIDI file: CurrentMicroSecondsPerBeat == zero'; + return false; + } + $thisfile_midi_raw['events'][$tracknumber][$CumulativeDeltaTime]['us_qnote'] = $CurrentMicroSecondsPerBeat; + $CurrentBeatsPerMinute = (1000000 / $CurrentMicroSecondsPerBeat) * 60; + $MicroSecondsPerQuarterNoteAfter[$CumulativeDeltaTime] = $CurrentMicroSecondsPerBeat; + $TicksAtCurrentBPM = 0; + break; + + case 0x58: // Time signature + $timesig_numerator = getid3_lib::BigEndian2Int($METAeventData{0}); + $timesig_denominator = pow(2, getid3_lib::BigEndian2Int($METAeventData{1})); // $02 -> x/4, $03 -> x/8, etc + $timesig_32inqnote = getid3_lib::BigEndian2Int($METAeventData{2}); // number of 32nd notes to the quarter note + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['timesig_32inqnote'] = $timesig_32inqnote; + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['timesig_numerator'] = $timesig_numerator; + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['timesig_denominator'] = $timesig_denominator; + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['timesig_text'] = $timesig_numerator.'/'.$timesig_denominator; + $thisfile_midi['timesignature'][] = $timesig_numerator.'/'.$timesig_denominator; + break; + + case 0x59: // Keysignature + $keysig_sharpsflats = getid3_lib::BigEndian2Int($METAeventData{0}); + if ($keysig_sharpsflats & 0x80) { + // (-7 -> 7 flats, 0 ->key of C, 7 -> 7 sharps) + $keysig_sharpsflats -= 256; + } + + $keysig_majorminor = getid3_lib::BigEndian2Int($METAeventData{1}); // 0 -> major, 1 -> minor + $keysigs = array(-7=>'Cb', -6=>'Gb', -5=>'Db', -4=>'Ab', -3=>'Eb', -2=>'Bb', -1=>'F', 0=>'C', 1=>'G', 2=>'D', 3=>'A', 4=>'E', 5=>'B', 6=>'F#', 7=>'C#'); + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['keysig_sharps'] = (($keysig_sharpsflats > 0) ? abs($keysig_sharpsflats) : 0); + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['keysig_flats'] = (($keysig_sharpsflats < 0) ? abs($keysig_sharpsflats) : 0); + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['keysig_minor'] = (bool) $keysig_majorminor; + //$thisfile_midi_raw['events'][$tracknumber][$eventid]['keysig_text'] = $keysigs[$keysig_sharpsflats].' '.($thisfile_midi_raw['events'][$tracknumber][$eventid]['keysig_minor'] ? 'minor' : 'major'); + + // $keysigs[$keysig_sharpsflats] gets an int key (correct) - $keysigs["$keysig_sharpsflats"] gets a string key (incorrect) + $thisfile_midi['keysignature'][] = $keysigs[$keysig_sharpsflats].' '.((bool) $keysig_majorminor ? 'minor' : 'major'); + break; + + case 0x7F: // Sequencer specific information + $custom_data = substr($METAeventData, 0, $METAeventLength); + break; + + default: + $ThisFileInfo['warning'][] = 'Unhandled META Event Command: '.$METAeventCommand; + break; + } + + } else { + + $ThisFileInfo['warning'][] = 'Unhandled MIDI Event ID: '.$MIDIevents[$tracknumber][$eventid]['eventid'].' + Channel ID: '.$MIDIevents[$tracknumber][$eventid]['channel']; + + } + } + if (($tracknumber > 0) || (count($trackdataarray) == 1)) { + $thisfile_midi['totalticks'] = max($thisfile_midi['totalticks'], $CumulativeDeltaTime); + } + } + $previoustickoffset = null; + + ksort($MicroSecondsPerQuarterNoteAfter); + foreach ($MicroSecondsPerQuarterNoteAfter as $tickoffset => $microsecondsperbeat) { + if (is_null($previoustickoffset)) { + $prevmicrosecondsperbeat = $microsecondsperbeat; + $previoustickoffset = $tickoffset; + continue; + } + if ($thisfile_midi['totalticks'] > $tickoffset) { + + if ($thisfile_midi_raw['ticksperqnote'] == 0) { + $ThisFileInfo['error'][] = 'Corrupt MIDI file: ticksperqnote == zero'; + return false; + } + + $ThisFileInfo['playtime_seconds'] += (($tickoffset - $previoustickoffset) / $thisfile_midi_raw['ticksperqnote']) * ($prevmicrosecondsperbeat / 1000000); + + $prevmicrosecondsperbeat = $microsecondsperbeat; + $previoustickoffset = $tickoffset; + } + } + if ($thisfile_midi['totalticks'] > $previoustickoffset) { + + if ($thisfile_midi_raw['ticksperqnote'] == 0) { + $ThisFileInfo['error'][] = 'Corrupt MIDI file: ticksperqnote == zero'; + return false; + } + + $ThisFileInfo['playtime_seconds'] += (($thisfile_midi['totalticks'] - $previoustickoffset) / $thisfile_midi_raw['ticksperqnote']) * ($microsecondsperbeat / 1000000); + + } + } + + + if (@$ThisFileInfo['playtime_seconds'] > 0) { + $ThisFileInfo['bitrate'] = (($ThisFileInfo['avdataend'] - $ThisFileInfo['avdataoffset']) * 8) / $ThisFileInfo['playtime_seconds']; + } + + if (!empty($thisfile_midi['lyrics'])) { + $thisfile_midi['comments']['lyrics'][] = $thisfile_midi['lyrics']; + } + + return true; + } + + function GeneralMIDIinstrumentLookup($instrumentid) { + + $begin = __LINE__; + + /** This is not a comment! + + 0 Acoustic Grand + 1 Bright Acoustic + 2 Electric Grand + 3 Honky-Tonk + 4 Electric Piano 1 + 5 Electric Piano 2 + 6 Harpsichord + 7 Clavier + 8 Celesta + 9 Glockenspiel + 10 Music Box + 11 Vibraphone + 12 Marimba + 13 Xylophone + 14 Tubular Bells + 15 Dulcimer + 16 Drawbar Organ + 17 Percussive Organ + 18 Rock Organ + 19 Church Organ + 20 Reed Organ + 21 Accordian + 22 Harmonica + 23 Tango Accordian + 24 Acoustic Guitar (nylon) + 25 Acoustic Guitar (steel) + 26 Electric Guitar (jazz) + 27 Electric Guitar (clean) + 28 Electric Guitar (muted) + 29 Overdriven Guitar + 30 Distortion Guitar + 31 Guitar Harmonics + 32 Acoustic Bass + 33 Electric Bass (finger) + 34 Electric Bass (pick) + 35 Fretless Bass + 36 Slap Bass 1 + 37 Slap Bass 2 + 38 Synth Bass 1 + 39 Synth Bass 2 + 40 Violin + 41 Viola + 42 Cello + 43 Contrabass + 44 Tremolo Strings + 45 Pizzicato Strings + 46 Orchestral Strings + 47 Timpani + 48 String Ensemble 1 + 49 String Ensemble 2 + 50 SynthStrings 1 + 51 SynthStrings 2 + 52 Choir Aahs + 53 Voice Oohs + 54 Synth Voice + 55 Orchestra Hit + 56 Trumpet + 57 Trombone + 58 Tuba + 59 Muted Trumpet + 60 French Horn + 61 Brass Section + 62 SynthBrass 1 + 63 SynthBrass 2 + 64 Soprano Sax + 65 Alto Sax + 66 Tenor Sax + 67 Baritone Sax + 68 Oboe + 69 English Horn + 70 Bassoon + 71 Clarinet + 72 Piccolo + 73 Flute + 74 Recorder + 75 Pan Flute + 76 Blown Bottle + 77 Shakuhachi + 78 Whistle + 79 Ocarina + 80 Lead 1 (square) + 81 Lead 2 (sawtooth) + 82 Lead 3 (calliope) + 83 Lead 4 (chiff) + 84 Lead 5 (charang) + 85 Lead 6 (voice) + 86 Lead 7 (fifths) + 87 Lead 8 (bass + lead) + 88 Pad 1 (new age) + 89 Pad 2 (warm) + 90 Pad 3 (polysynth) + 91 Pad 4 (choir) + 92 Pad 5 (bowed) + 93 Pad 6 (metallic) + 94 Pad 7 (halo) + 95 Pad 8 (sweep) + 96 FX 1 (rain) + 97 FX 2 (soundtrack) + 98 FX 3 (crystal) + 99 FX 4 (atmosphere) + 100 FX 5 (brightness) + 101 FX 6 (goblins) + 102 FX 7 (echoes) + 103 FX 8 (sci-fi) + 104 Sitar + 105 Banjo + 106 Shamisen + 107 Koto + 108 Kalimba + 109 Bagpipe + 110 Fiddle + 111 Shanai + 112 Tinkle Bell + 113 Agogo + 114 Steel Drums + 115 Woodblock + 116 Taiko Drum + 117 Melodic Tom + 118 Synth Drum + 119 Reverse Cymbal + 120 Guitar Fret Noise + 121 Breath Noise + 122 Seashore + 123 Bird Tweet + 124 Telephone Ring + 125 Helicopter + 126 Applause + 127 Gunshot + + */ + + return getid3_lib::EmbeddedLookup($instrumentid, $begin, __LINE__, __FILE__, 'GeneralMIDIinstrument'); + } + + function GeneralMIDIpercussionLookup($instrumentid) { + + $begin = __LINE__; + + /** This is not a comment! + + 35 Acoustic Bass Drum + 36 Bass Drum 1 + 37 Side Stick + 38 Acoustic Snare + 39 Hand Clap + 40 Electric Snare + 41 Low Floor Tom + 42 Closed Hi-Hat + 43 High Floor Tom + 44 Pedal Hi-Hat + 45 Low Tom + 46 Open Hi-Hat + 47 Low-Mid Tom + 48 Hi-Mid Tom + 49 Crash Cymbal 1 + 50 High Tom + 51 Ride Cymbal 1 + 52 Chinese Cymbal + 53 Ride Bell + 54 Tambourine + 55 Splash Cymbal + 56 Cowbell + 57 Crash Cymbal 2 + 59 Ride Cymbal 2 + 60 Hi Bongo + 61 Low Bongo + 62 Mute Hi Conga + 63 Open Hi Conga + 64 Low Conga + 65 High Timbale + 66 Low Timbale + 67 High Agogo + 68 Low Agogo + 69 Cabasa + 70 Maracas + 71 Short Whistle + 72 Long Whistle + 73 Short Guiro + 74 Long Guiro + 75 Claves + 76 Hi Wood Block + 77 Low Wood Block + 78 Mute Cuica + 79 Open Cuica + 80 Mute Triangle + 81 Open Triangle + + */ + + return getid3_lib::EmbeddedLookup($instrumentid, $begin, __LINE__, __FILE__, 'GeneralMIDIpercussion'); + } + +} + + +?>
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