ParseRIFFAMV example

switch ($nextRIFFheaderID) {
                        case 'RIFF':
                            $chunkdata['chunks'] = $this->ParseRIFF($chunkdata['offset'] + 4, $nextRIFFoffset);
                            if (!isset($thisfile_riff[$nextRIFFtype])) {
                                $thisfile_riff[$nextRIFFtype] = array();
                            }
                            $thisfile_riff[$nextRIFFtype][] = $chunkdata;
                            break;

                        case 'AMV ':
                            unset($info['riff']);
                            $info['amv'] = $this->ParseRIFFAMV($chunkdata['offset'] + 4, $nextRIFFoffset);
                            break;

                        case 'JUNK':
                            // ignore                             $thisfile_riff[$nextRIFFheaderID][] = $chunkdata;
                            break;

                        case 'IDVX':
                            $info['divxtag']['comments'] = self::ParseDIVXTAG($this->fread($chunkdata['size']));
                            break;