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Read length of mp3
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<?php | |
ini_set("max_execution_time", "30000"); | |
// how much detail we want. Larger number means less detail | |
// (basically, how many bytes/frames to skip processing) | |
// the lower the number means longer processing time | |
define("DETAIL", 5); | |
define("DEFAULT_WIDTH", 500); | |
define("DEFAULT_HEIGHT", 100); | |
define("DEFAULT_FOREGROUND", "#FF0000"); | |
define("DEFAULT_BACKGROUND", "#FFFFFF"); | |
/** | |
* GENERAL FUNCTIONS | |
*/ | |
function findValues($byte1, $byte2){ | |
$byte1 = hexdec(bin2hex($byte1)); | |
$byte2 = hexdec(bin2hex($byte2)); | |
return ($byte1 + ($byte2*256)); | |
} | |
/** | |
* Great function slightly modified as posted by Minux at | |
* http://forums.clantemplates.com/showthread.php?t=133805 | |
*/ | |
function html2rgb($input) { | |
$input=($input[0]=="#")?substr($input, 1,6):substr($input, 0,6); | |
return array( | |
hexdec(substr($input, 0, 2)), | |
hexdec(substr($input, 2, 2)), | |
hexdec(substr($input, 4, 2)) | |
); | |
} | |
if (isset($_FILES["mp3"])) { | |
/** | |
* PROCESS THE FILE | |
*/ | |
// temporary file name | |
$tmpname = substr(md5(time()), 0, 10); | |
// copy from temp upload directory to current | |
copy($_FILES["mp3"]["tmp_name"], "{$tmpname}_o.mp3"); | |
// support for stereo waveform? | |
$stereo = isset($_POST["stereo"]) && $_POST["stereo"] == "on" ? true : false; | |
// array of wavs that need to be processed | |
$wavs_to_process = array(); | |
/** | |
* convert mp3 to wav using lame decoder | |
* First, resample the original mp3 using as mono (-m m), 16 bit (-b 16), and 8 KHz (--resample 8) | |
* Secondly, convert that resampled mp3 into a wav | |
* We don't necessarily need high quality audio to produce a waveform, doing this process reduces the WAV | |
* to it's simplest form and makes processing significantly faster | |
*/ | |
if ($stereo) { | |
// scale right channel down (a scale of 0 does not work) | |
exec("lame {$tmpname}_o.mp3 --scale-r 0.1 -m m -S -f -b 16 --resample 8 {$tmpname}.mp3 && lame -S --decode {$tmpname}.mp3 {$tmpname}_l.wav"); | |
// same as above, left channel | |
exec("lame {$tmpname}_o.mp3 --scale-l 0.1 -m m -S -f -b 16 --resample 8 {$tmpname}.mp3 && lame -S --decode {$tmpname}.mp3 {$tmpname}_r.wav"); | |
$wavs_to_process[] = "{$tmpname}_l.wav"; | |
$wavs_to_process[] = "{$tmpname}_r.wav"; | |
} else { | |
exec("lame {$tmpname}_o.mp3 -m m -S -f -b 16 --resample 8 {$tmpname}.mp3 && lame -S --decode {$tmpname}.mp3 {$tmpname}.wav"); | |
$wavs_to_process[] = "{$tmpname}.wav"; | |
} | |
// delete temporary files | |
unlink("{$tmpname}_o.mp3"); | |
unlink("{$tmpname}.mp3"); | |
// get user vars from form | |
$width = isset($_POST["width"]) ? (int) $_POST["width"] : DEFAULT_WIDTH; | |
$height = isset($_POST["height"]) ? (int) $_POST["height"] : DEFAULT_HEIGHT; | |
$foreground = isset($_POST["foreground"]) ? $_POST["foreground"] : DEFAULT_FOREGROUND; | |
$background = isset($_POST["background"]) ? $_POST["background"] : DEFAULT_BACKGROUND; | |
$draw_flat = isset($_POST["flat"]) && $_POST["flat"] == "on" ? true : false; | |
$img = false; | |
// generate foreground color | |
list($r, $g, $b) = html2rgb($foreground); | |
// process each wav individually | |
for($wav = 1; $wav <= sizeof($wavs_to_process); $wav++) { | |
$filename = $wavs_to_process[$wav - 1]; | |
/** | |
* Below as posted by "zvoneM" on | |
* http://forums.devshed.com/php-development-5/reading-16-bit-wav-file-318740.html | |
* as findValues() defined above | |
* Translated from Croation to English - July 11, 2011 | |
*/ | |
$handle = fopen($filename, "r"); | |
// wav file header retrieval | |
$heading[] = fread($handle, 4); | |
$heading[] = bin2hex(fread($handle, 4)); | |
$heading[] = fread($handle, 4); | |
$heading[] = fread($handle, 4); | |
$heading[] = bin2hex(fread($handle, 4)); | |
$heading[] = bin2hex(fread($handle, 2)); | |
$heading[] = bin2hex(fread($handle, 2)); | |
$heading[] = bin2hex(fread($handle, 4)); | |
$heading[] = bin2hex(fread($handle, 4)); | |
$heading[] = bin2hex(fread($handle, 2)); | |
$heading[] = bin2hex(fread($handle, 2)); | |
$heading[] = fread($handle, 4); | |
$heading[] = bin2hex(fread($handle, 4)); | |
// wav bitrate | |
$peek = hexdec(substr($heading[10], 0, 2)); | |
$byte = $peek / 8; | |
// checking whether a mono or stereo wav | |
$channel = hexdec(substr($heading[6], 0, 2)); | |
$ratio = ($channel == 2 ? 40 : 80); | |
// start putting together the initial canvas | |
// $data_size = (size_of_file - header_bytes_read) / skipped_bytes + 1 | |
$data_size = floor((filesize($filename) - 44) / ($ratio + $byte) + 1); | |
$data_point = 0; | |
// now that we have the data_size for a single channel (they both will be the same) | |
// we can initialize our image canvas | |
if (!$img) { | |
// create original image width based on amount of detail | |
// each waveform to be processed with be $height high, but will be condensed | |
// and resized later (if specified) | |
$img = imagecreatetruecolor($data_size / DETAIL, $height * sizeof($wavs_to_process)); | |
// fill background of image | |
if ($background == "") { | |
// transparent background specified | |
imagesavealpha($img, true); | |
$transparentColor = imagecolorallocatealpha($img, 0, 0, 0, 127); | |
imagefill($img, 0, 0, $transparentColor); | |
} else { | |
list($br, $bg, $bb) = html2rgb($background); | |
imagefilledrectangle($img, 0, 0, (int) ($data_size / DETAIL), $height * sizeof($wavs_to_process), imagecolorallocate($img, $br, $bg, $bb)); | |
} | |
} | |
while(!feof($handle) && $data_point < $data_size){ | |
if ($data_point++ % DETAIL == 0) { | |
$bytes = array(); | |
// get number of bytes depending on bitrate | |
for ($i = 0; $i < $byte; $i++) | |
$bytes[$i] = fgetc($handle); | |
switch($byte){ | |
// get value for 8-bit wav | |
case 1: | |
$data = findValues($bytes[0], $bytes[1]); | |
break; | |
// get value for 16-bit wav | |
case 2: | |
if(ord($bytes[1]) & 128) | |
$temp = 0; | |
else | |
$temp = 128; | |
$temp = chr((ord($bytes[1]) & 127) + $temp); | |
$data = floor(findValues($bytes[0], $temp) / 256); | |
break; | |
} | |
// skip bytes for memory optimization | |
fseek($handle, $ratio, SEEK_CUR); | |
// draw this data point | |
// relative value based on height of image being generated | |
// data values can range between 0 and 255 | |
$v = (int) ($data / 255 * $height); | |
// don't print flat values on the canvas if not necessary | |
if (!($v / $height == 0.5 && !$draw_flat)) | |
// draw the line on the image using the $v value and centering it vertically on the canvas | |
imageline( | |
$img, | |
// x1 | |
(int) ($data_point / DETAIL), | |
// y1: height of the image minus $v as a percentage of the height for the wave amplitude | |
$height * $wav - $v, | |
// x2 | |
(int) ($data_point / DETAIL), | |
// y2: same as y1, but from the bottom of the image | |
$height * $wav - ($height - $v), | |
imagecolorallocate($img, $r, $g, $b) | |
); | |
} else { | |
// skip this one due to lack of detail | |
fseek($handle, $ratio + $byte, SEEK_CUR); | |
} | |
} | |
// close and cleanup | |
fclose($handle); | |
// delete the processed wav file | |
unlink($filename); | |
} | |
header("Content-Type: image/png"); | |
// want it resized? | |
if ($width) { | |
// resample the image to the proportions defined in the form | |
$rimg = imagecreatetruecolor($width, $height); | |
// save alpha from original image | |
imagesavealpha($rimg, true); | |
imagealphablending($rimg, false); | |
// copy to resized | |
imagecopyresampled($rimg, $img, 0, 0, 0, 0, $width, $height, imagesx($img), imagesy($img)); | |
imagepng($rimg); | |
imagedestroy($rimg); | |
} else { | |
imagepng($img); | |
} | |
imagedestroy($img); | |
} else { | |
?> | |
<form method="post" action="<?php print $_SERVER["REQUEST_URI"]; ?>" enctype="multipart/form-data"> | |
<p>MP3 File:<br /> | |
<input type="file" name="mp3" /></p> | |
<p>Image Width:<br /> | |
<input type="text" name="width" value="<?php print DEFAULT_WIDTH; ?>" /></p> | |
<p>Image Height:<br /> | |
<input type="text" name="height" value="<?php print DEFAULT_HEIGHT; ?>" /></p> | |
<p>Foreground Color: <small>(HEX/HTML color code)</small><br /> | |
<input type="text" name="foreground" value="<?php print DEFAULT_FOREGROUND; ?>" /></p> | |
<p>Background Color: (Leave blank for transparent background) <small>(HEX/HTML color code)</small><br /> | |
<input type="text" name="background" value="<?php print DEFAULT_BACKGROUND; ?>" /></p> | |
<p>Draw flat-line? <input type="checkbox" name="flat" /></p> | |
<p>Stereo waveform? <input type="checkbox" name="stereo" /></p> | |
<p><input type="submit" value="Generate Waveform" /></p> | |
</form> | |
<?php | |
} |
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