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ampache/modules/getid3/module.audio.midi.php

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24 KiB
PHP

<?php
// +----------------------------------------------------------------------+
// | PHP version 5 |
// +----------------------------------------------------------------------+
// | Copyright (c) 2002-2006 James Heinrich, Allan Hansen |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2 of the GPL license, |
// | that is bundled with this package in the file license.txt and is |
// | available through the world-wide-web at the following url: |
// | http://www.gnu.org/copyleft/gpl.html |
// +----------------------------------------------------------------------+
// | getID3() - http://getid3.sourceforge.net or http://www.getid3.org |
// +----------------------------------------------------------------------+
// | Authors: James Heinrich <infoØgetid3*org> |
// | Allan Hansen <ahØartemis*dk> |
// +----------------------------------------------------------------------+
// | module.audio.midi.php |
// | Module for analyzing midi audio files |
// | dependencies: NONE |
// +----------------------------------------------------------------------+
//
// $Id: module.audio.midi.php,v 1.5 2006/11/02 10:48:01 ah Exp $
class getid3_midi extends getid3_handler
{
public function Analyze() {
$getid3 = $this->getid3;
$getid3->info['midi']['raw'] = array ();
$info_midi = &$getid3->info['midi'];
$info_midi_raw = &$info_midi['raw'];
$getid3->info['fileformat'] = 'midi';
$getid3->info['audio']['dataformat'] = 'midi';
fseek($getid3->fp, $getid3->info['avdataoffset'], SEEK_SET);
$midi_data = fread($getid3->fp, getid3::FREAD_BUFFER_SIZE);
// Magic bytes: 'MThd'
getid3_lib::ReadSequence('BigEndian2Int', $info_midi_raw, $midi_data, 4,
array (
'headersize' => 4,
'fileformat' => 2,
'tracks' => 2,
'ticksperqnote' => 2
)
);
$offset = 14;
for ($i = 0; $i < $info_midi_raw['tracks']; $i++) {
if ((strlen($midi_data) - $offset) < 8) {
$midi_data .= fread($getid3->fp, getid3::FREAD_BUFFER_SIZE);
}
$track_id = substr($midi_data, $offset, 4);
$offset += 4;
if ($track_id != 'MTrk') {
throw new getid3_exception('Expecting "MTrk" at '.$offset.', found '.$track_id.' instead');
}
$track_size = getid3_lib::BigEndian2Int(substr($midi_data, $offset, 4));
$offset += 4;
$track_data_array[$i] = substr($midi_data, $offset, $track_size);
$offset += $track_size;
}
if (!isset($track_data_array) || !is_array($track_data_array)) {
throw new getid3_exception('Cannot find MIDI track information');
}
$info_midi['totalticks'] = 0;
$getid3->info['playtime_seconds'] = 0;
$current_ms_per_beat = 500000; // 120 beats per minute; 60,000,000 microseconds per minute -> 500,000 microseconds per beat
$current_beats_per_min = 120; // 120 beats per minute; 60,000,000 microseconds per minute -> 500,000 microseconds per beat
$ms_per_quarter_note_after = array ();
foreach ($track_data_array as $track_number => $track_data) {
$events_offset = $last_issued_midi_command = $last_issued_midi_channel = $cumulative_delta_time = $ticks_at_current_bpm = 0;
while ($events_offset < strlen($track_data)) {
$event_id = 0;
if (isset($midi_events[$track_number]) && is_array($midi_events[$track_number])) {
$event_id = count($midi_events[$track_number]);
}
$delta_time = 0;
for ($i = 0; $i < 4; $i++) {
$delta_time_byte = ord($track_data{$events_offset++});
$delta_time = ($delta_time << 7) + ($delta_time_byte & 0x7F);
if ($delta_time_byte & 0x80) {
// another byte follows
} else {
break;
}
}
$cumulative_delta_time += $delta_time;
$ticks_at_current_bpm += $delta_time;
$midi_events[$track_number][$event_id]['deltatime'] = $delta_time;
$midi_event_channel = ord($track_data{$events_offset++});
// OK, normal event - MIDI command has MSB set
if ($midi_event_channel & 0x80) {
$last_issued_midi_command = $midi_event_channel >> 4;
$last_issued_midi_channel = $midi_event_channel & 0x0F;
}
// Running event - assume last command
else {
$events_offset--;
}
$midi_events[$track_number][$event_id]['eventid'] = $last_issued_midi_command;
$midi_events[$track_number][$event_id]['channel'] = $last_issued_midi_channel;
switch ($midi_events[$track_number][$event_id]['eventid']) {
case 0x8: // Note off (key is released)
case 0x9: // Note on (key is pressed)
case 0xA: // Key after-touch
//$notenumber = ord($track_data{$events_offset++});
//$velocity = ord($track_data{$events_offset++});
$events_offset += 2;
break;
case 0xB: // Control Change
//$controllernum = ord($track_data{$events_offset++});
//$newvalue = ord($track_data{$events_offset++});
$events_offset += 2;
break;
case 0xC: // Program (patch) change
$new_program_num = ord($track_data{$events_offset++});
$info_midi_raw['track'][$track_number]['instrumentid'] = $new_program_num;
$info_midi_raw['track'][$track_number]['instrument'] = $track_number == 10 ? getid3_midi::GeneralMIDIpercussionLookup($new_program_num) : getid3_midi::GeneralMIDIinstrumentLookup($new_program_num);
break;
case 0xD: // Channel after-touch
//$channelnumber = ord($track_data{$events_offset++});
break;
case 0xE: // Pitch wheel change (2000H is normal or no change)
//$changeLSB = ord($track_data{$events_offset++});
//$changeMSB = ord($track_data{$events_offset++});
//$pitchwheelchange = (($changeMSB & 0x7F) << 7) & ($changeLSB & 0x7F);
$events_offset += 2;
break;
case 0xF:
if ($midi_events[$track_number][$event_id]['channel'] == 0xF) {
$meta_event_command = ord($track_data{$events_offset++});
$meta_event_length = ord($track_data{$events_offset++});
$meta_event_data = substr($track_data, $events_offset, $meta_event_length);
$events_offset += $meta_event_length;
switch ($meta_event_command) {
case 0x00: // Set track sequence number
//$track_sequence_number = getid3_lib::BigEndian2Int(substr($meta_event_data, 0, $meta_event_length));
//$info_midi_raw['events'][$track_number][$event_id]['seqno'] = $track_sequence_number;
break;
case 0x01: // Text: generic
$text_generic = substr($meta_event_data, 0, $meta_event_length);
//$info_midi_raw['events'][$track_number][$event_id]['text'] = $text_generic;
$info_midi['comments']['comment'][] = $text_generic;
break;
case 0x02: // Text: copyright
$text_copyright = substr($meta_event_data, 0, $meta_event_length);
//$info_midi_raw['events'][$track_number][$event_id]['copyright'] = $text_copyright;
$info_midi['comments']['copyright'][] = $text_copyright;
break;
case 0x03: // Text: track name
$text_trackname = substr($meta_event_data, 0, $meta_event_length);
$info_midi_raw['track'][$track_number]['name'] = $text_trackname;
break;
case 0x04: // Text: track instrument name
//$text_instrument = substr($meta_event_data, 0, $meta_event_length);
//$info_midi_raw['events'][$track_number][$event_id]['instrument'] = $text_instrument;
break;
case 0x05: // Text: lyrics
$text_lyrics = substr($meta_event_data, 0, $meta_event_length);
//$info_midi_raw['events'][$track_number][$event_id]['lyrics'] = $text_lyrics;
if (!isset($info_midi['lyrics'])) {
$info_midi['lyrics'] = '';
}
$info_midi['lyrics'] .= $text_lyrics . "\n";
break;
case 0x06: // Text: marker
//$text_marker = substr($meta_event_data, 0, $meta_event_length);
//$info_midi_raw['events'][$track_number][$event_id]['marker'] = $text_marker;
break;
case 0x07: // Text: cue point
//$text_cuepoint = substr($meta_event_data, 0, $meta_event_length);
//$info_midi_raw['events'][$track_number][$event_id]['cuepoint'] = $text_cuepoint;
break;
case 0x2F: // End Of Track
//$info_midi_raw['events'][$track_number][$event_id]['EOT'] = $cumulative_delta_time;
break;
case 0x51: // Tempo: microseconds / quarter note
$current_ms_per_beat = getid3_lib::BigEndian2Int(substr($meta_event_data, 0, $meta_event_length));
$info_midi_raw['events'][$track_number][$cumulative_delta_time]['us_qnote'] = $current_ms_per_beat;
$current_beats_per_min = (1000000 / $current_ms_per_beat) * 60;
$ms_per_quarter_note_after[$cumulative_delta_time] = $current_ms_per_beat;
$ticks_at_current_bpm = 0;
break;
case 0x58: // Time signature
$timesig_numerator = getid3_lib::BigEndian2Int($meta_event_data[0]);
$timesig_denominator = pow(2, getid3_lib::BigEndian2Int($meta_event_data[1])); // $02 -> x/4, $03 -> x/8, etc
//$timesig_32inqnote = getid3_lib::BigEndian2Int($meta_event_data[2]); // number of 32nd notes to the quarter note
//$info_midi_raw['events'][$track_number][$event_id]['timesig_32inqnote'] = $timesig_32inqnote;
//$info_midi_raw['events'][$track_number][$event_id]['timesig_numerator'] = $timesig_numerator;
//$info_midi_raw['events'][$track_number][$event_id]['timesig_denominator'] = $timesig_denominator;
//$info_midi_raw['events'][$track_number][$event_id]['timesig_text'] = $timesig_numerator.'/'.$timesig_denominator;
$info_midi['timesignature'][] = $timesig_numerator.'/'.$timesig_denominator;
break;
case 0x59: // Keysignature
$keysig_sharpsflats = getid3_lib::BigEndian2Int($meta_event_data{0});
if ($keysig_sharpsflats & 0x80) {
// (-7 -> 7 flats, 0 ->key of C, 7 -> 7 sharps)
$keysig_sharpsflats -= 256;
}
$keysig_majorminor = getid3_lib::BigEndian2Int($meta_event_data{1}); // 0 -> major, 1 -> minor
$keysigs = array (-7=>'Cb', -6=>'Gb', -5=>'Db', -4=>'Ab', -3=>'Eb', -2=>'Bb', -1=>'F', 0=>'C', 1=>'G', 2=>'D', 3=>'A', 4=>'E', 5=>'B', 6=>'F#', 7=>'C#');
//$info_midi_raw['events'][$track_number][$event_id]['keysig_sharps'] = (($keysig_sharpsflats > 0) ? abs($keysig_sharpsflats) : 0);
//$info_midi_raw['events'][$track_number][$event_id]['keysig_flats'] = (($keysig_sharpsflats < 0) ? abs($keysig_sharpsflats) : 0);
//$info_midi_raw['events'][$track_number][$event_id]['keysig_minor'] = (bool)$keysig_majorminor;
//$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');
// $keysigs[$keysig_sharpsflats] gets an int key (correct) - $keysigs["$keysig_sharpsflats"] gets a string key (incorrect)
$info_midi['keysignature'][] = $keysigs[$keysig_sharpsflats].' '.((bool)$keysig_majorminor ? 'minor' : 'major');
break;
case 0x7F: // Sequencer specific information
$custom_data = substr($meta_event_data, 0, $meta_event_length);
break;
default:
$getid3->warning('Unhandled META Event Command: '.$meta_event_command);
}
}
break;
default:
$getid3->warning('Unhandled MIDI Event ID: '.$midi_events[$track_number][$event_id]['eventid']);
}
}
if (($track_number > 0) || (count($track_data_array) == 1)) {
$info_midi['totalticks'] = max($info_midi['totalticks'], $cumulative_delta_time);
}
}
$previous_tick_offset = null;
ksort($ms_per_quarter_note_after);
foreach ($ms_per_quarter_note_after as $tick_offset => $ms_per_beat) {
if (is_null($previous_tick_offset)) {
$prev_ms_per_beat = $ms_per_beat;
$previous_tick_offset = $tick_offset;
continue;
}
if ($info_midi['totalticks'] > $tick_offset) {
$getid3->info['playtime_seconds'] += (($tick_offset - $previous_tick_offset) / $info_midi_raw['ticksperqnote']) * ($prev_ms_per_beat / 1000000);
$prev_ms_per_beat = $ms_per_beat;
$previous_tick_offset = $tick_offset;
}
}
if ($info_midi['totalticks'] > $previous_tick_offset) {
$getid3->info['playtime_seconds'] += (($info_midi['totalticks'] - $previous_tick_offset) / $info_midi_raw['ticksperqnote']) * ($ms_per_beat / 1000000);
}
if (@$getid3->info['playtime_seconds'] > 0) {
$getid3->info['bitrate'] = (($getid3->info['avdataend'] - $getid3->info['avdataoffset']) * 8) / $getid3->info['playtime_seconds'];
}
if (!empty($info_midi['lyrics'])) {
$info_midi['comments']['lyrics'][] = $info_midi['lyrics'];
}
return true;
}
public static function GeneralMIDIinstrumentLookup($instrument_id) {
static $lookup = array (
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 @$lookup[$instrument_id];
}
public static function GeneralMIDIpercussionLookup($instrument_id) {
static $lookup = array (
35 => 'Acoustic Bass Drum',
36 => 'Bass Drum 1',
37 => 'Side Stick',
38 => 'Acoustic Snare',
39 => 'Hand Clap',
40 => 'Electric Snare',
41 => 'Low Floor Tom',
42 => 'Closed Hi-Hat',
43 => 'High Floor Tom',
44 => 'Pedal Hi-Hat',
45 => 'Low Tom',
46 => 'Open Hi-Hat',
47 => 'Low-Mid Tom',
48 => 'Hi-Mid Tom',
49 => 'Crash Cymbal 1',
50 => 'High Tom',
51 => 'Ride Cymbal 1',
52 => 'Chinese Cymbal',
53 => 'Ride Bell',
54 => 'Tambourine',
55 => 'Splash Cymbal',
56 => 'Cowbell',
57 => 'Crash Cymbal 2',
59 => 'Ride Cymbal 2',
60 => 'Hi Bongo',
61 => 'Low Bongo',
62 => 'Mute Hi Conga',
63 => 'Open Hi Conga',
64 => 'Low Conga',
65 => 'High Timbale',
66 => 'Low Timbale',
67 => 'High Agogo',
68 => 'Low Agogo',
69 => 'Cabasa',
70 => 'Maracas',
71 => 'Short Whistle',
72 => 'Long Whistle',
73 => 'Short Guiro',
74 => 'Long Guiro',
75 => 'Claves',
76 => 'Hi Wood Block',
77 => 'Low Wood Block',
78 => 'Mute Cuica',
79 => 'Open Cuica',
80 => 'Mute Triangle',
81 => 'Open Triangle'
);
return @$lookup[$instrument_id];
}
}
?>