Extract and save image metadata. Props tellyworth. fixes #5162
git-svn-id: http://svn.automattic.com/wordpress/trunk@6313 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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ryan
parent
6f761b1ef3
commit
dd29614f60
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@ -152,6 +152,12 @@ function wp_generate_attachment_metadata( $attachment_id, $file ) {
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if ( @file_exists($thumb) )
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$metadata['thumb'] = basename($thumb);
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}
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// fetch additional metadata from exif/iptc
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$image_meta = wp_read_image_metadata( $file );
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if ($image_meta)
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$metadata['image_meta'] = $image_meta;
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}
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return apply_filters( 'wp_generate_attachment_metadata', $metadata );
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}
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@ -222,4 +228,84 @@ function wp_shrink_dimensions( $width, $height, $wmax = 128, $hmax = 96 ) {
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}
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}
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// convert a fraction string to a decimal
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function wp_exif_frac2dec($str) {
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@list( $n, $d ) = explode( '/', $str );
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if ( !empty($d) )
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return $n / $d;
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return $str;
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}
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// convert the exif date format to a unix timestamp
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function wp_exif_date2ts($str) {
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// seriously, who formats a date like 'YYYY:MM:DD hh:mm:ss'?
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@list( $date, $time ) = explode( ' ', trim($str) );
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@list( $y, $m, $d ) = explode( ':', $date );
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return strtotime( "{$y}-{$m}-{$d} {$time}" );
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}
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// get extended image metadata, exif or iptc as available
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function wp_read_image_metadata( $file ) {
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if ( !file_exists( $file ) )
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return false;
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// exif contains a bunch of data we'll probably never need formatted in ways that are difficult to use.
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// We'll normalize it and just extract the fields that are likely to be useful. Fractions and numbers
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// are converted to floats, dates to unix timestamps, and everything else to strings.
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$meta = array(
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'aperture' => 0,
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'credit' => '',
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'camera' => '',
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'caption' => '',
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'created_timestamp' => 0,
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'copyright' => '',
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'focal_length' => 0,
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'iso' => 0,
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'shutter_speed' => 0,
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'title' => '',
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);
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// read iptc first, since it might contain data not available in exif such as caption, description etc
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if ( is_callable('iptcparse') ) {
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getimagesize($file, $info);
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if ( !empty($info['APP13']) ) {
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$iptc = iptcparse($info['APP13']);
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if ( !empty($iptc['2#110'][0]) ) // credit
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$meta['credit'] = trim( $iptc['2#110'][0] );
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elseif ( !empty($iptc['2#080'][0]) ) // byline
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$meta['credit'] = trim( $iptc['2#080'][0] );
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if ( !empty($iptc['2#055'][0]) and !empty($iptc['2#060'][0]) ) // created datee and time
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$meta['created_timestamp'] = strtotime($iptc['2#055'][0] . ' ' . $iptc['2#060'][0]);
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if ( !empty($iptc['2#120'][0]) ) // caption
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$meta['caption'] = trim( $iptc['2#120'][0] );
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if ( !empty($iptc['2#116'][0]) ) // copyright
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$meta['copyright'] = trim( $iptc['2#116'][0] );
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if ( !empty($iptc['2#005'][0]) ) // title
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$meta['title'] = trim( $iptc['2#005'][0] );
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}
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}
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// fetch additional info from exif if available
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if ( is_callable('exif_read_data') ) {
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$exif = exif_read_data( $file );
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if (!empty($exif['FNumber']))
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$meta['aperture'] = round( wp_exif_frac2dec( $exif['FNumber'] ), 2 );
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if (!empty($exif['Model']))
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$meta['camera'] = trim( $exif['Model'] );
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if (!empty($exif['DateTimeDigitized']))
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$meta['created_timestamp'] = wp_exif_date2ts($exif['DateTimeDigitized']);
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if (!empty($exif['FocalLength']))
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$meta['focal_length'] = wp_exif_frac2dec( $exif['FocalLength'] );
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if (!empty($exif['ISOSpeedRatings']))
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$meta['iso'] = $exif['ISOSpeedRatings'];
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if (!empty($exif['ExposureTime']))
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$meta['shutter_speed'] = wp_exif_frac2dec( $exif['ExposureTime'] );
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}
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// FIXME: try other exif libraries if available
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return apply_filters( 'wp_read_image_metadata', $meta, $file );
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}
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?>
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@ -15,6 +15,12 @@ function wp_upload_display( $dims = false, $href = '' ) {
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}
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if ( isset($attachment_data['width']) )
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list($width,$height) = wp_shrink_dimensions($attachment_data['width'], $attachment_data['height'], 171, 128);
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// check for extended metadata from exif/iptc
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if ( !isset($attachment_data['image_meta']) && $is_image ) {
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$image_meta = wp_read_image_meta( $filesystem_path );
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$attachment_data['image_meta'] = $image_meta;
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wp_update_attachment_metadata( $id, $attachment_data );
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}
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$post_title = attribute_escape( the_title( '', '', false ) );
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$post_content = attribute_escape(apply_filters( 'content_edit_pre', $post->post_content ));
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@ -163,6 +169,45 @@ function wp_upload_form() {
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<th scope="row"><label for="post_content"><?php _e('Description'); ?></label></th>
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<td><textarea name="post_content" id="post_content"><?php echo $attachment->post_content; ?></textarea></td>
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</tr>
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<?php if (isset($attachment_data['image_meta'])) { ?>
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<tr>
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<th scope="row"><label for="url"><?php _e('Aperture'); ?></label></th>
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<td>f/<?php echo $attachment_data['image_meta']['aperture']; ?></td>
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</tr>
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<tr>
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<th scope="row"><label for="url"><?php _e('Credit'); ?></label></th>
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<td><?php echo $attachment_data['image_meta']['credit']; ?></td>
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</tr>
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<tr>
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<th scope="row"><label for="url"><?php _e('Camera'); ?></label></th>
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<td><?php echo $attachment_data['image_meta']['camera']; ?></td>
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</tr>
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<tr>
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<th scope="row"><label for="url"><?php _e('Created'); ?></label></th>
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<td><?php echo date_i18n(get_option('date_format').' '.get_option('time_format'), $attachment_data['image_meta']['created_timestamp']); ?></td>
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</tr>
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<tr>
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<th scope="row"><label for="url"><?php _e('Copyright'); ?></label></th>
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<td><?php echo $attachment_data['image_meta']['copyright']; ?></td>
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</tr>
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<tr>
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<th scope="row"><label for="url"><?php _e('Focal Length'); ?></label></th>
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<td><?php echo $attachment_data['image_meta']['focal_length']; ?>mm</td>
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</tr>
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<tr>
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<th scope="row"><label for="url"><?php _e('ISO'); ?></label></th>
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<td><?php echo $attachment_data['image_meta']['iso']; ?></td>
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</tr>
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<tr>
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<th scope="row"><label for="url"><?php _e('Shutter Speed'); ?></label></th>
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<td><?php $secs = $attachment_data['image_meta']['shutter_speed'];
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echo ($secs > 0.0 and $secs < 1.0) ? ("1/" . round(1/$secs)) : ($secs); ?>s</td>
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</tr>
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<tr>
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<th scope="row"><label for="url"><?php _e('Title'); ?></label></th>
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<td><?php echo $attachment_data['image_meta']['title']; ?></td>
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</tr>
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<?php } ?>
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<tr id="buttons" class="submit">
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<td colspan='2'>
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<?php if ( $id ) : ?>
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