Php: how to convert a wav file to an image file and display it on the page _ PHP Tutorial

Php converts a wav file into an image file and displays it on the page. Php: convert a wav file to an image file and display it on the page. This document describes how php converts a wav file to an image file and displays it on the page. How php converts wav files into image files and displays them on the page

This example describes how php converts a wav file into an image file and displays it on the page. Share it with you for your reference. The specific analysis is as follows:

Requirement: convert a wav file to a png file and display it.

Wav_To_Png.php:

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Function wav_graph ($ file, $ f = 0, $ w = 0) { Global $ DATA_DIR; If (! Is_file ($ file )) Return 0; $ Fp = fopen ($ DATA_DIR. $ file, 'r '); $ Raw = fread ($ fp, 36 ); $ Str = ''; $ Header = unpack ('a4riff/VSize/A4Wav/A4Head/VHeadSize/vPCM/vChannels/VSampleRate/VByteRate/vBlockAlign/vSampleBits ', $ raw ); Foreach ($ header as $ k => $ v) $ Str. = $ k. ':'. $ v .''; Fseek ($ fp, 36 + $ header ['headsize']-16 ); $ Raw = fread ($ fp, 8 ); $ Data = unpack ('a4data/VDataSize ', $ raw ); Foreach ($ data as $ k => $ v) $ Str. = $ k. ':'. $ v .''; $ B = $ header ['samples']; $ C = $ header ['channels']; $ L = $ B * $ c/8; // sample frame length in bytes $ S = $ data ['datasize ']/$ l; // total number of samples $ R = $ header ['samplerate']; If ($ f) $ H = pow (2, $ B)/$ f; Else {$ H = 200; $ f = pow (2, $ B-1)/$ h ;} If ($ w = 0) $ W = round ($ r/1000); // default to show 1 k sample frames per minute Header ("Content-type: image/png "); $ Im = imagecreate ($ s/$ w, $ h * $ c * 2 ); Imagecolorallocate ($ im, 0xff, 0xff, 0xff); // white bg $ Color = imagecolorallocate ($ im, 0, 0,255); // black Imagestring ($ im, 5, 5, 5, $ str, $ color ); $ X = 0; $ y = array (); $ yn = array (); For ($ I = 0; $ I <$ c; $ I ++) $ y [$ I] = $ h * $ I + $ h; $ N = $ l * $ w; While (1) { If ($ s = 0) Break; If ($ s <$ n) $ N = $ s; $ Samples = fread ($ fp, 1000 * $ n ); If ($ samples === FALSE) Break; $ Packed = unpack ("s *", $ samples ); Foreach ($ packed as $ k => $ v) { $ Cnt = ($ K-1) % ($ w * $ l ); If ($ cnt> $ c-1) Continue; $ Yn [$ cnt] = $ h * $ cnt + $ h-$ v/$ f; Imageline ($ im, $ x, $ y [$ cnt], $ x + 1, $ yn [$ cnt], $ color ); $ Y [$ cnt] = $ yn [$ cnt]; $ X ++; } $ S-= $ n; } Imagepng ($ im ); Imagedestroy ($ im ); } Wav_graph('GetWave.wav '); ?>

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Examples in this article describes how php converts wav files into image files and displays them on the page. Share it with you...