diff options
| -rw-r--r-- | matroska.php | 34 | ||||
| -rw-r--r-- | videodata.php | 89 |
2 files changed, 105 insertions, 18 deletions
diff --git a/matroska.php b/matroska.php index aad18c08..ff6ce03d 100644 --- a/matroska.php +++ b/matroska.php @@ -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)) . $content; +} diff --git a/videodata.php b/videodata.php index 3fe9eeee..ec302fdc 100644 --- a/videodata.php +++ b/videodata.php @@ -1,22 +1,77 @@ <?php require dirname(__FILE__) . '/matroska.php'; -// Header for single VPx keyframe -function vpxFrameHeader($size, $width, $height, $codecID) { - return "\x1A\x45\xDF\xA3\x9F\x42\x86\x81\x01\x42\xF7\x81\x01\x42\xF2\x81" - . "\x04\x42\xF3\x81\x08\x42\x82\x84\x77\x65\x62\x6D\x42\x87\x81\x02" - . "\x42\x85\x81\x02\x18\x53\x80\x67\x08" . pack('N', $size + 173) . "\x11\x4D\x9B" - . "\x74\xB8\x4D\xBB\x8B\x53\xAB\x84\x15\x49\xA9\x66\x53\xAC\x81\x3D" - . "\x4D\xBB\x8B\x53\xAB\x84\x16\x54\xAE\x6B\x53\xAC\x81\x58\x4D\xBB" - . "\x8B\x53\xAB\x84\x1C\x53\xBB\x6B\x53\xAC\x81\x85\x4D\xBB\x8B\x53" - . "\xAB\x84\x1F\x43\xB6\x75\x53\xAC\x81\x97\x15\x49\xA9\x66\x96\x2A" - . "\xD7\xB1\x83\x0F\x42\x40\x44\x89\x84\x41\x20\x00\x00\x4D\x80\x81" - . "\x66\x57\x41\x81\x66\x16\x54\xAE\x6B\xA8\xAE\xA6\xD7\x81\x01\x73" - . "\xC5\x81\x01\x83\x81\x01\x23\xE3\x83\x83\x98\x96\x80\x86\x85" . $codecID - . "\xE0\x8C\xB0\x84" . pack('N', $width) . "\xBA\x84" . pack('N', $height) - . "\x1C\x53\xBB\x6B\x8D\xBB\x8B\xB3\x81\x00\xB7\x86\xF7\x81" - . "\x01\xF1\x81\x97\x1F\x43\xB6\x75\x08" . pack('N', $size + 13) . "\xE7\x81\x00" - . "\xA3\x08" . pack('N', $size + 4) . "\x81\x00\x00\x80"; +// Make video from single VPx keyframe +function muxVPxFrame($width, $height, $codecID, $data) { + $size = strlen($data); + $lenSeekHead = 61; + $lenCues = 18; + $ebml = encodeElement('EBML', + encodeElement('EBMLVersion', "\x01") + . encodeElement('EBMLReadVersion', "\x01") + . encodeElement('EBMLMaxIDLength', "\x04") + . encodeElement('EBMLMaxSizeLength', "\x08") + . encodeElement('DocType', "webm") + . encodeElement('DocTypeVersion', "\x02") + . encodeElement('DocTypeReadVersion', "\x02") + ); + $info = encodeElement('Info', + encodeElement('TimecodeScale', "\x0F\x42\x40") + . encodeElement('Duration', "\x41\x20\x00\x00") + . encodeElement('MuxingApp', 'f') + . encodeElement('WritingApp', 'f') + ); + $tracks = encodeElement('Tracks', + encodeElement('TrackEntry', + encodeElement('TrackNumber', "\x01") + . encodeElement('TrackUID', "\x01") + . encodeElement('TrackType', "\x01") + . encodeElement('DefaultDuration', "\x98\x96\x80") + . encodeElement('CodecID', $codecID) + . encodeElement('Video', + encodeElement('PixelWidth', pack('N', $width)) + . encodeElement('PixelHeight', pack('N', $height)) + ) + ) + ); + $cues = encodeElement('Cues', + encodeElement('CuePoint', + encodeElement('CueTime', "\x00") + . encodeElement('CueTrackPositions', + encodeElement('CueTrack', "\x01") + . encodeElement('CueClusterPosition', chr($lenSeekHead + strlen($info) + strlen($tracks) + $lenCues)) + ) + ) + ); + $seekHead = encodeElement('SeekHead', + encodeElement('Seek', + encodeElement('SeekID', encodeElementName('Info')) + . encodeElement('SeekPosition', chr($lenSeekHead)) + ) + . encodeElement('Seek', + encodeElement('SeekID', encodeElementName('Tracks')) + . encodeElement('SeekPosition', chr($lenSeekHead + strlen($info))) + ) + . encodeElement('Seek', + encodeElement('SeekID', encodeElementName('Cues')) + . encodeElement('SeekPosition', chr($lenSeekHead + strlen($info) + strlen($tracks))) + ) + . encodeElement('Seek', + encodeElement('SeekID', encodeElementName('Cluster')) + . encodeElement('SeekPosition', chr($lenSeekHead + strlen($info) + strlen($tracks) + $lenCues)) + ) + ); + $cluster = "\x1F\x43\xB6\x75\x08" . pack('N', $size + 13) . ( + //. encodeElement('Cluster', + encodeElement('Timecode', "\x00") + . "\xA3\x08" . pack('N', $size + 4) . ("\x81\x00\x00\x80" . $data) + //. encodeElement('SimpleBlock', "\x81\x00\x00\x80" . $data) + ); + $segment = "\x18\x53\x80\x67\x08" . pack('N', $size + 173) . ( + // . encodeElement('Segment', + $seekHead . $info . $tracks . $cues . $cluster + ); + return $ebml . $segment; } // Locate first VPx keyframe of track $trackNumber after timecode $skip @@ -120,7 +175,7 @@ function videoData($filename) { } $frame = firstVPxFrame($segment, $trackNumber, $skip); if (!isset($frame)) throw new Exception('no keyframes'); - $data['frame'] = vpxFrameHeader($frame->size(), $pixelWidth, $pixelHeight, $codecID) . $frame->readAll(); + $data['frame'] = muxVPxFrame($pixelWidth, $pixelHeight, $codecID, $frame->readAll()); } catch (Exception $e) { error_log($e->getMessage()); |