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<?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');
}
}
?>
|
