75 lines
2.2 KiB
PHP
75 lines
2.2 KiB
PHP
<?php
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include_once("./_common.php");
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// prepare an array of wavfiles
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$wavs_dir = $g4['path'].'/plugin/captcha/wavs/';
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$number = (string)$_SESSION['ss_captcha_key'];
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$wavs = array();
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for($i=0;$i<strlen($number);$i++){
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$file = $wavs_dir.$number[$i].'.wav';
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$wavs[] = $file;
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}
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header('Content-type: audio/x-wav');
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header('Content-Disposition: attachment;filename=captcha.wav');
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echo joinwavs($wavs);
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/**
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* Join multiple wav files
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*
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* All wave files need to have the same format and need to be uncompressed.
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* The headers of the last file will be used (with recalculated datasize
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* of course)
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*
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* @link http://ccrma.stanford.edu/CCRMA/Courses/422/projects/WaveFormat/
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* @link http://www.thescripts.com/forum/thread3770.html
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*/
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function joinwavs($wavs)
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{
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$fields = join('/',array( 'H8ChunkID', 'VChunkSize', 'H8Format',
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'H8Subchunk1ID', 'VSubchunk1Size',
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'vAudioFormat', 'vNumChannels', 'VSampleRate',
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'VByteRate', 'vBlockAlign', 'vBitsPerSample' ));
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$data = '';
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$info = array();
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foreach($wavs as $wav){
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$fp = fopen($wav,'rb');
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$header = fread($fp,36);
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$info = unpack($fields,$header);
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// read optional extra stuff
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if($info['Subchunk1Size'] > 16){
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$header .= fread($fp,($info['Subchunk1Size']-16));
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}
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// read SubChunk2ID
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$header .= fread($fp,4);
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// read Subchunk2Size
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$size = unpack('vsize',fread($fp, 4));
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$size = $size['size'];
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// read data
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$data .= fread($fp,$size);
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}
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return ''
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.pack('a4', 'RIFF')
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.pack('V', strlen($data) + 36)
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.pack('a4', 'WAVE')
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.pack('a4', 'fmt ')
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.pack('V', $info['Subchunk1Size']) // 16
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.pack('v', $info['AudioFormat']) // 1
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.pack('v', $info['NumChannels']) // 1
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.pack('V', $info['SampleRate']) // 8000
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.pack('V', $info['ByteRate']) // 8000
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.pack('v', $info['BlockAlign']) // 1
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.pack('v', $info['BitsPerSample']) // 8
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.pack('a4', 'data')
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.pack('V', strlen($data))
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.$data;
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}
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?>
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