用php生成mp3波形

本文介绍了用php生成mp3波形的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我需要构建一个将mp3文件转换为波形图像的Web脚本，然后浏览了此网站.

I need to build a web script that converts a mp3 file to a waveform image, and I came across this website.

我已经将LAMB的PHP文件，.dll和.exe文件上传到了我的网站(由主机怪物托管).

I’ve uploaded the PHP file and .dll and .exe file from LAMB to my website (hosted by host monster).

但是当我尝试在网站上上传MP3文件时，它只会生成黑色图像而不是波形图像.

But when I try uploading the MP3 file on the website, it just generates a black image instead of the waveform image.

我对PHP知之甚少，所以我不完全知道出什么问题，但是我猜想它与程序的上载部分有关.

I have little knowledge of PHP, so I don’t exactly know what’s wrong, but I’m guessing it has to do with the uploading part of the program.

有人可以告诉我哪里出了问题以及如何克服吗?

Could anybody tell me what is wrong and how I can get over it?

以下是php代码的原样(也可以在GitHub上的此存储库中).

The following is the php code as is (also available in this repository on GitHub).

<?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 * forums.clantemplates/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 * forums.devshed/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 }

推荐答案

在这里查看一下，它是您要尝试执行的仅PHP实现: www.phpclasses/package/482-PHP-Extracts-attributes-of -audio-files-Visualization.html

Have a look at this here, it is a PHP only implementation of what you are trying to do: www.phpclasses/package/482-PHP-Extracts-attributes-of-audio-files-Visualization.html