From 10f76202fd55c53463c6c5a4d94846718cd82d10 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Roland=20H=C3=A4der?= <roland@mxchange.org>
Date: Sat, 17 Jun 2017 22:39:12 +0200
Subject: [PATCH] Experimental "audio-fetching" script added
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Signed-off-by: Roland Häder <roland@mxchange.org>
---
 contrib/audio.php | 121 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 121 insertions(+)
 create mode 100644 contrib/audio.php

diff --git a/contrib/audio.php b/contrib/audio.php
new file mode 100644
index 00000000..d0f753a3
--- /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);
-- 
2.39.2