Experimental "audio-fetching" script added

Signed-off-by: Roland Häder <roland@mxchange.org>

diff --git a/contrib/audio.php b/contrib/audio.php
new file mode 100644 (file)
index 0000000..d0f753a
--- /dev/null
+++ b/contrib/audio.php
@@ -0,0 +1,121 @@
+<?php
+$GLOBALS['options'] = array(
+       'analyze_input' => FALSE,
+       'reduce_noise'  => FALSE,
+       'ignore_noise'  => FALSE,
+       'keep_noise'    => FALSE,
+       'buffer_size'   => 8,
+);
+
+if (isset($_SERVER['argv'][1]) && $_SERVER['argv'][1] == 'a') {
+       $GLOBALS['options']['analyze_input'] = TRUE;
+} elseif (isset($_SERVER['argv'][1]) && $_SERVER['argv'][1] == 'r') {
+       $GLOBALS['options']['reduce_noise'] = TRUE;
+} elseif (isset($_SERVER['argv'][1]) && $_SERVER['argv'][1] == 'k') {
+       $GLOBALS['options']['keep_noise'] = TRUE;
+}
+
+if (isset($_SERVER['argv'][1]) && $_SERVER['argv'][1] == 'i') {
+       $GLOBALS['options']['ignore_noise'] = TRUE;
+} elseif (isset($_SERVER['argv'][2]) && $_SERVER['argv'][2] == 'i') {
+       $GLOBALS['options']['ignore_noise'] = TRUE;
+} elseif (isset($_SERVER['argv'][2]) && $_SERVER['argv'][2] == 'k') {
+       $GLOBALS['options']['keep_noise'] = TRUE;
+}
+
+function analyzeForNoiseOnly ($data) {
+       $GLOBALS['analysis']['breakdown'] = array();
+       $GLOBALS['analysis']['average']   = 0;
+
+       for ($i = 0; $i < strlen($data); $i++) {
+               $ord = ord(substr($data, $i, 1));
+               $GLOBALS['analysis']['breakdown'][$ord] = TRUE;
+               $GLOBALS['analysis']['average'] += $ord;
+       }
+
+       if (!$GLOBALS['options']['keep_noise'] && !$GLOBALS['options']['ignore_noise'] && count($GLOBALS['analysis']['breakdown']) == 2 && isset($GLOBALS['analysis']['breakdown'][127]) && isset($GLOBALS['analysis']['breakdown'][128])) {
+               if ($GLOBALS['options']['analyze_input']) {
+                       //echo 'NOISE1!' . PHP_EOL;
+               }
+               return NULL;
+       } elseif (!$GLOBALS['options']['keep_noise'] && !$GLOBALS['options']['ignore_noise'] && count($GLOBALS['analysis']['breakdown']) == 1 && isset($GLOBALS['analysis']['breakdown'][127])) {
+               if ($GLOBALS['options']['analyze_input']) {
+                       //echo 'NOISE2!' . PHP_EOL;
+               }
+               return NULL;
+       } elseif (!$GLOBALS['options']['keep_noise'] && $GLOBALS['options']['ignore_noise'] && count($GLOBALS['analysis']['breakdown']) < 2) {
+               if ($GLOBALS['options']['analyze_input']) {
+                       //echo 'NOISE3!' . PHP_EOL;
+               }
+               return NULL;
+       }
+
+       // Return given data
+       return $data;
+}
+
+//$pcm = fopen('output1.pcm', 'rb') or die('Cannot read from audio');
+$pcm = fopen('/dev/dsp2', 'rb') or die('Cannot read from audio');
+
+$empty = str_repeat(chr(128), $GLOBALS['options']['buffer_size']);
+
+while (TRUE) {
+       //usleep(100);
+       $data = trim(fread($pcm, $GLOBALS['options']['buffer_size']));
+       if ((empty($data)) || ($data == $empty)) {
+               if ($GLOBALS['options']['analyze_input']) {
+                       //echo 'EMPTY!' . PHP_EOL;
+               }
+               continue;
+       }
+
+       // Detect noise
+       $data = analyzeForNoiseOnly($data);
+
+       // Empty?
+       if (empty($data)) {
+               // Skip this
+               continue;
+       } // END - if
+
+       $GLOBALS['analysis']['average'] = floor($GLOBALS['analysis']['average'] / strlen($data));
+
+       if ($GLOBALS['options']['analyze_input']) {
+               $simpleAnalysis = '';
+               for ($i = 0; $i < strlen($data); $i++) {
+                       $ord = ord(substr($data, $i, 1));
+                       $simpleAnalysis .= str_pad($ord, 3, '0', STR_PAD_LEFT) . '=0x' . str_pad(dechex($ord), 2, '0', STR_PAD_LEFT) . ',';
+               }
+               $simpleAnalysis = substr($simpleAnalysis, 0, -1) . ' (' . count($GLOBALS['analysis']['breakdown']) . ')' . PHP_EOL;
+
+               echo $simpleAnalysis;
+       } elseif ($GLOBALS['options']['reduce_noise']) {
+               $out = '';
+               for ($i = 0; $i < strlen($data); $i++) {
+                       $ord = ord(substr($data, $i, 1));
+                       // @TODO What do here to remove noise?
+                       $ord -= $GLOBALS['analysis']['average'];
+                       $out .= chr($ord);
+               }
+
+               $out = analyzeForNoiseOnly($out);
+
+               if (empty($out)) {
+                       // Skip this
+                       continue;
+               } // END - if
+
+               echo $out;
+       } else {
+               echo $data;
+       }
+
+       if (feof($pcm)) {
+               if ($GLOBALS['options']['analyze_input']) {
+                       echo 'EOF!' . PHP_EOL;
+               }
+               break;
+       }
+}
+
+fclose($pcm);