354 lines
13 KiB
PHP
354 lines
13 KiB
PHP
<?php
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/******************************************************************************
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*
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* Filename: pentax.php
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*
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* Description: Pentax (Asahi) Makernote Parser
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* Provides functions to decode an Pentax (Asahi) EXIF makernote and to interpret
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* the resulting array into html.
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*
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* Pentax Makernote Format:
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*
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* Type 1
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*
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* Field Size Description
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* ----------------------------------------------------------------
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* IFD Data Variable NON-Standard IFD Data using Pentax Tags
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* IFD has no Next-IFD pointer at end of IFD,
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* and Offsets are relative to the start
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* of the current IFD tag, not the TIFF header
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* ----------------------------------------------------------------
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*
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*
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* Type 2
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*
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* Field Size Description
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* ----------------------------------------------------------------
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* Header 4 Bytes "AOC\x00"
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* Unknown 2 Bytes Unknown field
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* IFD Data Variable NON-Standard IFD Data using Casio Type 2 Tags
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* IFD has no Next-IFD pointer at end of IFD,
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* and Offsets are relative to the start
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* of the current IFD tag, not the TIFF header
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* ----------------------------------------------------------------
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*
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*
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*
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* Author: Evan Hunter
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*
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* Date: 30/7/2004
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*
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* Project: JPEG Metadata
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*
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* Revision: 1.00
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*
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* URL: http://electronics.ozhiker.com
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*
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* Copyright: Copyright Evan Hunter 2004
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* This file may be used freely for non-commercial purposes.For
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* commercial uses please contact the author: evan@ozhiker.com
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*
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******************************************************************************/
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// Pentax Type 2 makernote uses Casio Type 2 tags - ensure they are included
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include_once $JPEG_TOOLKIT.'Makernotes/casio.php';
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// Add the parser and interpreter functions to the list of Makernote parsers and interpreters.
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$GLOBALS['Makernote_Function_Array']['Read_Makernote_Tag'][] = "get_Pentax_Makernote";
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$GLOBALS['Makernote_Function_Array']['get_Makernote_Text_Value'][] = "get_Pentax_Text_Value";
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$GLOBALS['Makernote_Function_Array']['Interpret_Makernote_to_HTML'][] = "get_Pentax_Makernote_Html";
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/******************************************************************************
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*
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* Function: get_Pentax_Makernote
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*
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* Description: Decodes the Makernote tag and returns the new tag with the decoded
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* information attached. Returns false if this is not a makernote
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* that can be processed with this script
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*
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* Parameters: Makernote_Tag - the element of an EXIF array containing the
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* makernote, as returned from get_EXIF_JPEG
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* EXIF_Array - the entire EXIF array containing the
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* makernote, as returned from get_EXIF_JPEG, in
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* case more information is required for decoding
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* filehnd - an open file handle for the file containing the
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* makernote - does not have to be positioned at the
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* start of the makernote
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* Make_Field - The contents of the EXIF Make field, to aid
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* determining whether this script can decode
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* the makernote
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*
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*
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* Returns: Makernote_Tag - the Makernote_Tag from the parameters, but
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* modified to contain the decoded information
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* FALSE - If this script could not decode the makernote, or if
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* an error occured in decoding
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*
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******************************************************************************/
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function get_Pentax_Makernote( $Makernote_Tag, $EXIF_Array, $filehnd, $Make_Field )
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{
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// Check if the Make Field contains the word Pentax or Asahi
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if ( ( stristr( $Make_Field, "Pentax" ) === FALSE ) &&
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( stristr( $Make_Field, "Asahi" ) === FALSE ) )
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{
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// Couldn't find Pentax or Asahi in the maker - abort
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return FALSE;
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}
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// Check if the header exists at the start of the Makernote
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if ( substr( $Makernote_Tag['Data'], 0, 4 ) == "AOC\x00" )
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{
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// Type 2 Pentax Makernote
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// Seek to the start of the IFD
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fseek($filehnd, $Makernote_Tag['Tiff Offset'] + $Makernote_Tag['Offset'] + 6 );
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// Read the IFD(s) into an array
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$Makernote_Tag['Decoded Data'] = read_Multiple_IFDs( $filehnd, $Makernote_Tag['Tiff Offset'], $Makernote_Tag['ByteAlign'], "Casio Type 2" );
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// Save some information into the Tag element to aid interpretation
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$Makernote_Tag['Decoded'] = TRUE;
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$Makernote_Tag['Makernote Type'] = "Casio Type 2";
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$Makernote_Tag['Makernote Tags'] = "Casio Type 2";
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// Return the new tag
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return $Makernote_Tag;
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}
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else
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{
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// Type 1 Penax Makernote
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// Seek to the start of the IFD
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fseek($filehnd, $Makernote_Tag['Tiff Offset'] + $Makernote_Tag['Offset'] + 0 );
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// Read the IFD(s) into an array
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$Makernote_Tag['Decoded Data'] = read_Multiple_IFDs( $filehnd, $Makernote_Tag['Tiff Offset'], $Makernote_Tag['ByteAlign'], "Pentax" );
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// Save some information into the Tag element to aid interpretation
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$Makernote_Tag['Decoded'] = TRUE;
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$Makernote_Tag['Makernote Type'] = "Pentax";
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$Makernote_Tag['Makernote Tags'] = "Pentax";
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// Return the new tag
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return $Makernote_Tag;
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}
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// Shouldn't get here
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return FALSE;
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}
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/******************************************************************************
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* End of Function: get_Pentax_Makernote
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******************************************************************************/
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/******************************************************************************
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*
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* Function: get_Pentax_Text_Value
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*
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* Description: Provides a text value for any tag marked as special for makernotes
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* that this script can decode. Returns false if this is not a makernote
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* that can be processed with this script
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*
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* Parameters: Exif_Tag - the element of an the Makernote array containing the
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* tag in question, as returned from get_Pentax_Makernote
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* Tag_Definitions_Name - The name of the Tag Definitions group
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* within the global array IFD_Tag_Definitions
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*
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*
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* Returns: output - the text value for the tag
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* FALSE - If this script could not decode the makernote, or if
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* an error occured in decoding
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*
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******************************************************************************/
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function get_Pentax_Text_Value( $Exif_Tag, $Tag_Definitions_Name )
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{
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// Check that this tag uses the Pentax tags, otherwise it can't be interpreted here
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if ( $Tag_Definitions_Name == "Pentax" )
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{
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// No Special Tags so far
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return FALSE;
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}
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return FALSE;
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}
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/******************************************************************************
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* End of Function: get_Pentax_Text_Value
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******************************************************************************/
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/******************************************************************************
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*
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* Function: get_Pentax_Makernote_Html
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*
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* Description: Attempts to interpret a makernote into html. Returns false if
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* it is not a makernote that can be processed with this script
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*
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* Parameters: Makernote_Tag - the element of an EXIF array containing the
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* makernote, as returned from get_EXIF_JPEG
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* filename - the name of the JPEG file being processed ( used
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* by scripts which display embedded thumbnails)
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*
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*
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* Returns: output - the html representing the makernote
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* FALSE - If this script could not interpret the makernote, or if
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* an error occured in decoding
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*
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******************************************************************************/
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function get_Pentax_Makernote_Html( $Makernote_tag, $filename )
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{
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// Check that this is a Pentax type makernote
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if ( $Makernote_tag['Makernote Type'] != "Pentax" )
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{
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// Not a Pentax makernote - abort
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return False;
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}
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// Interpret the IFD and return the html
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return interpret_IFD( $Makernote_tag['Decoded Data'][0], $filename );
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}
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/******************************************************************************
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* End of Function: get_Pentax_Makernote_Html
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******************************************************************************/
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/******************************************************************************
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* Global Variable: IFD_Tag_Definitions, Pentax
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*
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* Contents: This global variable provides definitions of the known Pentax Type 1
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* Makernote tags, indexed by their tag number.
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*
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******************************************************************************/
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$GLOBALS[ "IFD_Tag_Definitions" ]["Pentax"] = array(
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0x0001 => array( 'Name' => "Capture Mode",
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'Type' => "Lookup",
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0 => "Auto",
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1 => "Night-scene",
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2 => "Manual",
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4 => "Multiple" ),
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0x0002 => array( 'Name' => "Quality Level",
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'Type' => "Lookup",
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0 => "Good",
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1 => "Better",
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2 => "Best" ),
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0x0003 => array( 'Name' => "Focus Mode",
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'Type' => "Lookup",
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2 => "Custom",
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3 => "Auto" ),
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0x0004 => array( 'Name' => "Flash Mode",
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'Type' => "Lookup",
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1 => "Auto",
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2 => "Flash on",
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4 => "Flash off",
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6 => "Red-eye Reduction" ),
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0x0007 => array( 'Name' => "White Balance",
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'Type' => "Lookup",
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0 => "Auto",
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1 => "Daylight",
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2 => "Shade",
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3 => "Tungsten",
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4 => "Fluorescent",
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5 => "Manual" ),
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0x000a => array( 'Name' => "Digital Zoom",
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'Type' => "Numeric",
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'Units' => " (0 = Off)" ),
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0x000b => array( 'Name' => "Sharpness",
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'Type' => "Lookup",
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0 => "Normal",
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1 => "Soft",
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2 => "Hard" ),
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0x000c => array( 'Name' => "Contrast",
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'Type' => "Lookup",
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0 => "Normal",
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1 => "Low",
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2 => "High" ),
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0x000d => array( 'Name' => "Saturation",
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'Type' => "Lookup",
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0 => "Normal",
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1 => "Low",
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2 => "High" ),
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0x0014 => array( 'Name' => "ISO Speed",
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'Type' => "Lookup",
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10 => "100",
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16 => "200",
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100 => "100",
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200 => "200" ),
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0x0017 => array( 'Name' => "Colour",
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'Type' => "Lookup",
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1 => "Normal",
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2 => "Black & White",
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3 => "Sepia" ),
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0x0e00 => array( 'Name' => "Print Image Matching Info",
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'Type' => "PIM" ),
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0x1000 => array( 'Name' => "Time Zone",
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'Type' => "String" ),
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0x1001 => array( 'Name' => "Daylight Savings",
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'Type' => "String" ),
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);
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/******************************************************************************
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* End of Global Variable: IFD_Tag_Definitions, Pentax
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******************************************************************************/
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?>
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