FIX: Stream audio in browser (#1872)

This fixes browsers like Safari and allows them to stream audio within
the browser vs downloading the audio.

app/recordings/recordings.php

@@ -85,6 +85,11 @@ require_once "resources/check_auth.php";
 				}
 
 			if (file_exists($full_recording_path)) {
+				//content-range
+				if (isset($_SERVER['HTTP_RANGE']))  {
+					range_download($full_recording_path);
+				}
+				
 				$fd = fopen($full_recording_path, "rb");
 				if ($_GET['t'] == "bin") {
 					header("Content-Type: application/force-download");
@@ -104,7 +109,7 @@ require_once "resources/check_auth.php";
 				header('Content-Disposition: attachment; filename="'.$recording_filename.'"');
 				header("Cache-Control: no-cache, must-revalidate"); // HTTP/1.1
 				header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past
-				header("Content-Length: " . filesize($full_recording_path));
+				// header("Content-Length: " . filesize($full_recording_path));
 				ob_clean();
 				fpassthru($fd);
 			}
@@ -377,4 +382,101 @@ require_once "resources/check_auth.php";
 //include the footer
 	require_once "resources/footer.php";
 
+
+function range_download($file) {
+
+	$fp = @fopen($file, 'rb');
+
+	$size   = filesize($file); // File size
+	$length = $size;           // Content length
+	$start  = 0;               // Start byte
+	$end    = $size - 1;       // End byte
+	// Now that we've gotten so far without errors we send the accept range header
+	/* At the moment we only support single ranges.
+	 * Multiple ranges requires some more work to ensure it works correctly
+	 * and comply with the spesifications: http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
+	 *
+	 * Multirange support annouces itself with:
+	 * header('Accept-Ranges: bytes');
+	 *
+	 * Multirange content must be sent with multipart/byteranges mediatype,
+	 * (mediatype = mimetype)
+	 * as well as a boundry header to indicate the various chunks of data.
+	 */
+	header("Accept-Ranges: 0-$length");
+	// header('Accept-Ranges: bytes');
+	// multipart/byteranges
+	// http://www.w3.org/Protocols/rfc2616/rfc2616-sec19.html#sec19.2
+	if (isset($_SERVER['HTTP_RANGE'])) {
+
+		$c_start = $start;
+		$c_end   = $end;
+		// Extract the range string
+		list(, $range) = explode('=', $_SERVER['HTTP_RANGE'], 2);
+		// Make sure the client hasn't sent us a multibyte range
+		if (strpos($range, ',') !== false) {
+
+			// (?) Shoud this be issued here, or should the first
+			// range be used? Or should the header be ignored and
+			// we output the whole content?
+			header('HTTP/1.1 416 Requested Range Not Satisfiable');
+			header("Content-Range: bytes $start-$end/$size");
+			// (?) Echo some info to the client?
+			exit;
+		}
+		// If the range starts with an '-' we start from the beginning
+		// If not, we forward the file pointer
+		// And make sure to get the end byte if spesified
+		if ($range0 == '-') {
+
+			// The n-number of the last bytes is requested
+			$c_start = $size - substr($range, 1);
+		}
+		else {
+
+			$range  = explode('-', $range);
+			$c_start = $range[0];
+			$c_end   = (isset($range[1]) && is_numeric($range[1])) ? $range[1] : $size;
+		}
+		/* Check the range and make sure it's treated according to the specs.
+		 * http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html
+		 */
+		// End bytes can not be larger than $end.
+		$c_end = ($c_end > $end) ? $end : $c_end;
+		// Validate the requested range and return an error if it's not correct.
+		if ($c_start > $c_end || $c_start > $size - 1 || $c_end >= $size) {
+
+			header('HTTP/1.1 416 Requested Range Not Satisfiable');
+			header("Content-Range: bytes $start-$end/$size");
+			// (?) Echo some info to the client?
+			exit;
+		}
+		$start  = $c_start;
+		$end    = $c_end;
+		$length = $end - $start + 1; // Calculate new content length
+		fseek($fp, $start);
+		header('HTTP/1.1 206 Partial Content');
+	}
+	// Notify the client the byte range we'll be outputting
+	header("Content-Range: bytes $start-$end/$size");
+	header("Content-Length: $length");
+
+	// Start buffered download
+	$buffer = 1024 * 8;
+	while(!feof($fp) && ($p = ftell($fp)) <= $end) {
+
+		if ($p + $buffer > $end) {
+
+			// In case we're only outputtin a chunk, make sure we don't
+			// read past the length
+			$buffer = $end - $p + 1;
+		}
+		set_time_limit(0); // Reset time limit for big files
+		echo fread($fp, $buffer);
+		flush(); // Free up memory. Otherwise large files will trigger PHP's memory limit.
+	}
+
+	fclose($fp);
+
+}
 ?>

themes/default/template.php

@@ -247,6 +247,16 @@
 				recording_audio.play();
 				document.getElementById('recording_button_'+recording_id).innerHTML = "<?php echo str_replace("class='list_control_icon'", "class='list_control_icon' style='opacity: 1;'", $v_link_label_pause); ?>";
 				audio_clock = setInterval(function () { update_progress(recording_id); }, 20);
+
+				$("[id*=recording_button]").not("[id*=recording_button_"+recording_id+"]").html("<?php echo $v_link_label_play; ?>");
+				$("[id*=recording_progress_bar]").not("[id*=recording_progress_bar_"+recording_id+"]").css('display', 'none');
+				
+				$('audio').each(function(){
+					if ($(this).get(0) != recording_audio) {
+					    $(this).get(0).pause(); // Stop playing
+					    $(this).get(0).currentTime = 0; // Reset time
+					}
+				});
 			}
 			else {
 				recording_audio.pause();