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clean up frame extraction code

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This commit is contained in:
ccd0 2013-11-30 02:07:05 -08:00
parent 2175e84834
commit 14ac1b562d
2 changed files with 105 additions and 18 deletions
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34
matroska.php
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@ -9,6 +9,7 @@ class EBMLElementType {
// Information needed to parse all possible element types in a document
class EBMLElementTypeList {
private $_els;
private $_ids;
public function __construct($filename) {
$lines = file($filename);
@ -27,6 +28,7 @@ class EBMLElementTypeList {
}
}
$this->_els[$id] = $t;
$this->_ids[strtoupper($t->name)] = $id;
}
}
@ -39,6 +41,12 @@ class EBMLElementTypeList {
return $this->_els[$id]->name;
}
public function id($name) {
$name = strtoupper($name);
if (!isset($this->_ids[$name])) return NULL;
return $this->_ids[$name];
}
public function datatype($id) {
if ($id == 'root') return 'container';
if (!isset($this->_els[$id])) return 'binary';
@ -379,7 +387,7 @@ class EBMLElementList extends EBMLElement implements Iterator {
foreach ($this as $element) {
$iElement++;
if ($iElement > self::$MAX_ELEMENTS) throw new Exception('not supported: too many elements');
if ($element->name() == $name) {
if (strtoupper($element->name()) == strtoupper($name)) {
return $element->value();
}
}
@ -488,3 +496,27 @@ function readMatroska($fileHandle) {
}
return $root;
}
function encodeVarInt($n) {
$data = '';
$flag = 0x80;
while ($n >= $flag) {
if ($flag == 0) {
throw new Exception('not supported: number too large');
}
$data = chr($n & 0xFF) . $data;
$n = $n >> 8;
$flag = $flag >> 1;
}
$data = chr($n | $flag) . $data;
return $data;
}
function encodeElementName($name) {
global $EBML_ELEMENTS;
return encodeVarInt($EBML_ELEMENTS->id($name));
}
function encodeElement($name, $content) {
return encodeElementName($name) . encodeVarInt(strlen($content)) . $content;
}