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Improve wav file generation
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@dapphp
dapphp committed Apr 13, 2011
1 parent 011656f commit 48a21a3
Showing 1 changed file with 84 additions and 64 deletions.
148 changes: 84 additions & 64 deletions securimage.php
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Expand Up @@ -123,6 +123,7 @@ class Securimage
public $code_length;
public $case_sensitive;
public $charset;
public $expiry_time;

public $session_name;

Expand All @@ -146,6 +147,8 @@ class Securimage
public $code;
public $code_display;

public $audio_path;

public $captcha_type;

protected $im;
Expand Down Expand Up @@ -221,7 +224,15 @@ public function __construct()
$this->namespace = 'default';
}

$this->captcha_type = self::CAPTCHA_MATH;
if ($this->audio_path == null) {
$this->audio_path = $this->securimage_path . '/audio/';
}

if ($this->expiry_time == null) {
$this->expiry_time = 900;
}

//$this->captcha_type = self::CAPTCHA_MATH;
$this->case_sensitive = false;
$this->charset = 'ABCDEFGHKLMNPRSTUVWYZabcdefghklmnprstuvwyz23456789';
}
Expand All @@ -245,19 +256,23 @@ public function check($code)
public function outputAudioFile()
{
if (strtolower($this->audio_format) == 'wav') {
header('Content-type: audio/x-wav');
//header('Content-type: audio/x-wav');
$ext = 'wav';
} else {
header('Content-type: audio/mpeg'); // default to mp3
$ext = 'mp3';
}

//die('here');

header("Content-Disposition: attachment; filename=\"securimage_audio.{$ext}\"");
//header("Content-Disposition: attachment; filename=\"securimage_audio.{$ext}\"");
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Expires: Sun, 1 Jan 2000 12:00:00 GMT');
header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . 'GMT');

$audio = $this->getAudibleCode($ext);

die($audio);

header('Content-Length: ' . strlen($audio));

Expand Down Expand Up @@ -609,7 +624,7 @@ protected function getAudibleCode($format = 'mp3')
for($i = 0; $i < strlen($code); ++$i) {
$letters[] = $code{$i};
}

if ($format == 'mp3') {
return $this->generateMP3($letters);
} else {
Expand Down Expand Up @@ -816,74 +831,79 @@ protected function generateMP3()

protected function generateWAV($letters)
{
$data_len = 0;
$files = array();
$out_data = '';
$data_len = 0;
$files = array();
$out_data = '';
$out_channels = 0;
$out_samplert = 0;
$out_bpersample = 0;
$numSamples = 0;

foreach ($letters as $letter) {
for ($i = 0; $i < sizeof($letters); ++$i) {
$letter = $letters[$i];
$filename = $this->audio_path . strtoupper($letter) . '.wav';

$fp = fopen($filename, 'rb');

$file = array();

$data = fread($fp, filesize($filename)); // read file in
$file = array();
$data = @file_get_contents($filename);

if ($data === false) {
echo 'read failed';
var_dump($filename);
var_dump($letters);
var_dump($letter);
return false;
}

$header = substr($data, 0, 36);
$body = substr($data, 44);


$data = unpack('NChunkID/VChunkSize/NFormat/NSubChunk1ID/VSubChunk1Size/vAudioFormat/vNumChannels/VSampleRate/VByteRate/vBlockAlign/vBitsPerSample', $header);

$file['sub_chunk1_id'] = $data['SubChunk1ID'];
$file['bits_per_sample'] = $data['BitsPerSample'];
$file['channels'] = $data['NumChannels'];
$file['format'] = $data['AudioFormat'];
$file['sample_rate'] = $data['SampleRate'];
$file['size'] = $data['ChunkSize'] + 8;
$file['data'] = $body;

if ( ($p = strpos($file['data'], 'LIST')) !== false) {
// If the LIST data is not at the end of the file, this will probably break your sound file
$info = substr($file['data'], $p + 4, 8);
$data = unpack('Vlength/Vjunk', $info);
$file['data'] = substr($file['data'], 0, $p);
$file['size'] = $file['size'] - (strlen($file['data']) - $p);
$info = unpack('NChunkID/VChunkSize/NFormat/NSubChunk1ID/'
.'VSubChunk1Size/vAudioFormat/vNumChannels/'
.'VSampleRate/VByteRate/vBlockAlign/vBitsPerSample',
$header);

$dataPos = strpos($data, 'data');
$out_channels = $info['NumChannels'];
$out_samplert = $info['SampleRate'];
$out_bpersample = $info['BitsPerSample'];

if ($dataPos === false) {
// wav file with no data?
echo 'no data';
return false;
}

$files[] = $file;
$data = null;
$header = null;
$body = null;

$data_len += strlen($file['data']);

fclose($fp);
}

$out_data = '';
for($i = 0; $i < sizeof($files); ++$i) {
if ($i == 0) { // output header
$out_data .= pack('C4VC8', ord('R'), ord('I'), ord('F'), ord('F'), $data_len + 36, ord('W'), ord('A'), ord('V'), ord('E'), ord('f'), ord('m'), ord('t'), ord(' '));

$out_data .= pack('VvvVVvv',
16,
$files[$i]['format'],
$files[$i]['channels'],
$files[$i]['sample_rate'],
$files[$i]['sample_rate'] * (($files[$i]['bits_per_sample'] * $files[$i]['channels']) / 8),
($files[$i]['bits_per_sample'] * $files[$i]['channels']) / 8,
$files[$i]['bits_per_sample'] );

$out_data .= pack('C4', ord('d'), ord('a'), ord('t'), ord('a'));

$out_data .= pack('V', $data_len);

if ($info['AudioFormat'] != 1) {
// only work with PCM audio
echo 'not pcm';
return false;
}

$out_data .= $files[$i]['data'];

if ($info['SubChunk1Size'] != 16 && $info['SubChunk1Size'] != 18) {
// probably unsupported extension
echo 'bad size';
var_dump($info['SubChunk1Size']);
return false;
}

if ($info['SubChunk1Size'] > 16) {
$header .= substr($data, 36, $info['SubChunk1Size'] - 16);
}

if ($i == 0) {
// create the final file's header, size will be adjusted later
$out_data = $header . 'data';
}

$samples = unpack('VSamples', substr($data, $dataPos + 4, 4));
$out_data .= substr($data, $dataPos + 8, $samples['Samples']);
$numSamples += $samples['Samples'];
}

$this->scrambleAudioData($out_data, 'wav');
$filesize = strlen($out_data);
$chunkSize = $filesize - 8;
$dataCSize = $numSamples;

$out_data = substr_replace($out_data, pack('V', $filesize), 4, 4);
$out_data = substr_replace($out_data, pack('V', $numSamples), 40 + ($info['SubChunk1Size'] - 16), 4);

return $out_data;
}

Expand Down

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