Index: src/wp-admin/includes/media.php
===================================================================
--- src/wp-admin/includes/media.php	(revision 25562)
+++ src/wp-admin/includes/media.php	(working copy)
@@ -21,7 +21,14 @@
 		'library' => __('Media Library')
 	);
 
-	return apply_filters('media_upload_tabs', $_default_tabs);
+	/**
+	 * Filter the available tabs in the legacy (pre-3.5) media popup.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @param array $_default_tabs An array of media tabs in the form of key/value pairs.
+	 */
+	return apply_filters( 'media_upload_tabs', $_default_tabs );
 }
 
 /**
@@ -73,7 +80,12 @@
 		elseif ( isset($_GET['tab']) && array_key_exists($_GET['tab'], $tabs) )
 			$current = $_GET['tab'];
 		else
-			$current = apply_filters('media_upload_default_tab', $default);
+			/**
+			 * Filter the default tab in the legacy (pre-3.5) media popup.
+			 *
+			 * @since 2.5.0
+			 */
+			$current = apply_filters( 'media_upload_default_tab', $default );
 
 		foreach ( $tabs as $callback => $text ) {
 			$class = '';
@@ -113,6 +125,20 @@
 	if ( $url )
 		$html = '<a href="' . esc_attr($url) . "\"$rel>$html</a>";
 
+	/**
+	 * Filter the image HTML markup to send to the editor.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @param string $html     The image HTML markup to send.
+	 * @param int     $id        The attachment id.
+	 * @param string $caption The image caption.
+	 * @param string $title     The image title.
+	 * @param string $align    The image alignment.
+	 * @param string $url       The image source URL.
+	 * @param string $size     The image size.
+	 * @param string $alt       The image alternative, or alt, text.
+	 */
 	$html = apply_filters( 'image_send_to_editor', $html, $id, $caption, $title, $align, $url, $size, $alt );
 
 	return $html;
@@ -135,6 +161,16 @@
  */
 function image_add_caption( $html, $id, $caption, $title, $align, $url, $size, $alt = '' ) {
 
+	/**
+	 * Filter whether to disable captions.
+	 *
+	 * Prevents image captions from being appended to image HTML when inserted into the editor.
+	 *
+	 * @since 2.7.0
+	 *
+	 * @param bool Whether to disable appending captions. Returning true to the filter will disable captions.
+	 *                   Default empty string.
+	 */
 	if ( empty($caption) || apply_filters( 'disable_captions', '' ) )
 		return $html;
 
@@ -156,6 +192,14 @@
 
 	$shcode = '[caption id="' . $id . '" align="align' . $align	. '" width="' . $width . '"]' . $html . ' ' . $caption . '[/caption]';
 
+	/**
+	 * Filter the image HTML markup including the caption shortcode.
+	 *
+	 * @since 2.6.0
+	 *
+	 * @param string $shcode The image HTML markup with caption shortcode.
+	 * @param string $html     The image HTML markup.
+	 */
 	return apply_filters( 'image_add_caption_shortcode', $shcode, $html );
 }
 add_filter( 'image_send_to_editor', 'image_add_caption', 20, 8 );
@@ -397,16 +441,73 @@
 //]]>
 </script>
 <?php
-do_action('admin_enqueue_scripts', 'media-upload-popup');
-do_action('admin_print_styles-media-upload-popup');
-do_action('admin_print_styles');
-do_action('admin_print_scripts-media-upload-popup');
-do_action('admin_print_scripts');
-do_action('admin_head-media-upload-popup');
-do_action('admin_head');
+	/**
+	 * Enqueue scripts for the admin.
+	 *
+	 * @since 2.8.0
+	 * @since 3.5.0
+	 *
+	 * @param Unknown
+	 */
+	do_action( 'admin_enqueue_scripts', 'media-upload-popup' );
 
+	/**
+	 * Prints styles enqueued for the legacy media upload popup.
+	 *
+	 * @since 2.9.0
+	 * @since 3.5.0
+	 */
+	do_action( 'admin_print_styles-media-upload-popup' );
+
+	/**
+	 * Prints styles enqueued for the admin.
+	 *
+	 * @since 2.6.0
+	 */
+	do_action( 'admin_print_styles' );
+
+	/**
+	 * Prints scripts enqueued for the legacy media upload popup.
+	 *
+	 * @since 2.9.0
+	 * @since 3.5.0
+	 */
+	do_action( 'admin_print_scripts-media-upload-popup' );
+
+	/**
+	 * Prints scripts enqueued for the admin.
+	 *
+	 * @since 2.1.0
+	 */
+	do_action( 'admin_print_scripts' );
+
+	/**
+	 * Prints scripts enqueued for the admin header for the legacy media upload popup.
+	 *
+	 * @since 2.9.0
+	 * @since 3.5.0
+	 */
+	do_action( 'admin_head-media-upload-popup' );
+
+	/**
+	 * Fires in the admin header.
+	 *
+	 * @since 1.2.1
+	 */
+	do_action( 'admin_head' );
+
 if ( is_string($content_func) )
-	do_action( "admin_head_{$content_func}" );
+	/**
+	 * Fires in the admin header for specific media upload type forms.
+	 *
+	 * Part of the legacy (pre-3.5) media upload popup.
+	 *
+	 * The dynamic portion of the hook, $content_func, refers
+	 * to the media upload type form callback.
+	 *
+	 * @since 2.5.0
+	 */
+do_action( "admin_head_{$content_func}" );
 ?>
 </head>
 <body<?php if ( isset($GLOBALS['body_id']) ) echo ' id="' . $GLOBALS['body_id'] . '"'; ?> class="wp-core-ui no-js">
@@ -418,6 +519,11 @@
 	$args = array_slice($args, 1);
 	call_user_func_array($content_func, $args);
 
+	/**
+	 * Prints scripts enqueued for the admin footer.
+	 *
+	 * @since 2.8.0
+	 */
 	do_action('admin_print_footer_scripts');
 ?>
 <script type="text/javascript">if(typeof wpOnload=='function')wpOnload();</script>
@@ -446,7 +552,16 @@
 
 	echo '<a href="#" id="insert-media-button" class="button insert-media add_media" data-editor="' . esc_attr( $editor_id ) . '" title="' . esc_attr__( 'Add Media' ) . '">' . $img . __( 'Add Media' ) . '</a>';
 
-	// Don't use this filter. Want to add a button? Use the media_buttons action.
+	/**
+	 * Filter legacy media buttons (deprecated).
+	 *
+	 * Don't use this filter. Want to add a button? Use the 'media_buttons' action.
+	 *
+	 * @since 2.5.0
+	 * @deprecated 3.5.0
+	 *
+	 * @param string Media buttons context.
+	 */
 	$legacy_filter = apply_filters('media_buttons_context', ''); // deprecated
 
 	if ( $legacy_filter ) {
@@ -472,6 +587,15 @@
 	if ( ! empty( $tab ) )
 		$upload_iframe_src = add_query_arg('tab', $tab, $upload_iframe_src);
 
+	/**
+	 * Filter the upload iframe source URL by media type.
+	 *
+	 * The dynamic portion of the hook name, $type, refers to the type of media uploaded.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @param string $upload_iframe_src The upload iframe source URL by type.
+	 */
 	$upload_iframe_src = apply_filters($type . '_upload_iframe_src', $upload_iframe_src);
 
 	return add_query_arg('TB_iframe', true, $upload_iframe_src);
@@ -514,6 +638,14 @@
 				$post['post_parent'] = $attachment['post_parent'];
 		}
 
+		/**
+		 * Filter attachment fields to be saved.
+		 *
+		 * @since 2.5.0
+		 *
+		 * @param WP_Post $post           The WP_Post object.
+		 * @param array      $attachment An array of attachment metadata.
+		 */
 		$post = apply_filters('attachment_fields_to_save', $post, $attachment);
 
 		if ( isset($attachment['image_alt']) ) {
@@ -561,6 +693,15 @@
 			$html = "<a href='{$attachment['url']}'$rel>$html</a>";
 		}
 
+		/**
+		 * Filter the media HTML markup sent to the editor.
+		 *
+		 * @since 2.5.0
+		 *
+		 * @param string $html           The media's HTML markup sent to the editor.
+		 * @param int     $send_id       The first key from the $_POST['send'] data.
+		 * @param array  $attachment The attachment metadata.
+		 */
 		$html = apply_filters('media_send_to_editor', $html, $send_id, $attachment);
 		return media_send_to_editor($html);
 	}
@@ -608,6 +749,17 @@
 				&& ( 'audio' == $ext_type || 'video' == $ext_type ) )
 					$type = $ext_type;
 
+			/**
+			 * Filter the media URL sent to the editor by type.
+			 *
+			 * The dynamic portion of the hook name, $type, refers to the type of media being sent.
+			 *
+			 * @since 3.3.0
+			 *
+			 * @param string $html  The HTML markup sent to the editor.
+			 * @param string $src   The media source URL.
+			 * @param string $title  The media title.
+			 */
 			$html = apply_filters( $type . '_send_to_editor_url', $html, esc_url_raw( $src ), $title );
 		} else {
 			$align = '';
@@ -779,8 +931,22 @@
 function image_size_input_fields( $post, $check = '' ) {
 
 		// get a list of the actual pixel dimensions of each possible intermediate version of this image
-		$size_names = apply_filters( 'image_size_names_choose', array('thumbnail' => __('Thumbnail'), 'medium' => __('Medium'), 'large' => __('Large'), 'full' => __('Full Size')) );
+		$size_names = array(
+			'thumbnail' => __( 'Thumbnail' ),
+			'medium'    => __( 'Medium' ),
+			'large'     => __( 'Large' ),
+			'full'      => __( 'Full Size' )
+		);
 
+		/**
+		 * Filter the names of the default image sizes.
+		 *
+		 * @since 3.3.0
+		 *
+		 * @param array $size_names An array of image sizes and their names.
+		 */
+		$size_names = apply_filters( 'image_size_names_choose', $size_names );
+
 		if ( empty($check) )
 			$check = get_user_setting('imgsize', 'medium');
 
@@ -1061,6 +1227,14 @@
 		unset( $form_fields['image_alt'] );
 	}
 
+	/**
+	 * Filter the attachment fields to edit.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @param array      $form_fields An array of attachment form fields.
+	 * @param WP_Post $post          The WP_Post attachment object.
+	 */
 	$form_fields = apply_filters('attachment_fields_to_edit', $form_fields, $post);
 
 	return $form_fields;
@@ -1126,6 +1300,14 @@
 
 	$default_args = array( 'errors' => null, 'send' => $current_post_id ? post_type_supports( get_post_type( $current_post_id ), 'editor' ) : true, 'delete' => true, 'toggle' => true, 'show_title' => true );
 	$args = wp_parse_args( $args, $default_args );
+
+	/**
+	 * Filter the arguments used to get an image for the edit image form.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @param array $args An array of arguments. @see get_media_item()
+	 */
 	$args = apply_filters( 'get_media_item_args', $args );
 	extract( $args, EXTR_SKIP );
 
@@ -1180,6 +1362,15 @@
 	$meta = wp_get_attachment_metadata( $post->ID );
 	if ( isset( $meta['width'], $meta['height'] ) )
 		$media_dims .= "<span id='media-dims-$post->ID'>{$meta['width']}&nbsp;&times;&nbsp;{$meta['height']}</span> ";
+
+	/**
+	 * Filter the media metadata.
+	 *
+	 * @since 2.5.0
+	 *
+	 * @param string     $media_dims The HTML markup containing the media dimensions.
+	 * @param WP_Post $post          The WP_Post attachment object.
+	 */
 	$media_dims = apply_filters( 'media_meta', $media_dims, $post );
 
 	$image_edit_button = '';
@@ -1343,6 +1534,8 @@
 	$user_can_edit = current_user_can( 'edit_post', $attachment_id );
 
 	$args = wp_parse_args( $args, $default_args );
+
+	//duplicate_hook
 	$args = apply_filters( 'get_media_item_args', $args );
 
 	$form_fields = array();
@@ -1376,6 +1569,7 @@
 	// The recursive merge is easily traversed with array casting: foreach( (array) $things as $thing )
 	$form_fields = array_merge_recursive($form_fields, (array) $args['errors'] );
 
+	//duplicate_hook
 	$form_fields = apply_filters( 'attachment_fields_to_edit', $form_fields, $post );
 
 	unset( $form_fields['image-size'], $form_fields['align'], $form_fields['image_alt'],
@@ -1382,6 +1576,7 @@
 		$form_fields['post_title'], $form_fields['post_excerpt'], $form_fields['post_content'],
 		$form_fields['url'], $form_fields['menu_order'], $form_fields['image_url'] );
 
+	//duplicate_hook
 	$media_meta = apply_filters( 'media_meta', '', $post );
 
 	$defaults = array(
@@ -1545,7 +1740,12 @@
 	return;
 }
 
-do_action('pre-upload-ui');
+/**
+ * Fires just before the legacy (pre-3.5) upload interface is loaded.
+ *
+ * @since 2.6.0
+ */
+do_action( 'pre-upload-ui' );
 
 $post_params = array(
 		"post_id" => $post_id,
@@ -1555,7 +1755,17 @@
 		"short" => "1",
 );
 
-$post_params = apply_filters( 'upload_post_params', $post_params ); // hook change! old name: 'swfupload_post_params'
+/**
+ * Filter the media upload post parameters.
+ *
+ * Previously 'swfupload_post_params'.
+ *
+ * @since 3.3.0
+ * @since 3.5.0
+ *
+ * @param array $post_params An array of media upload parameters used by Plupload.
+ */
+$post_params = apply_filters( 'upload_post_params', $post_params );
 
 $plupload_init = array(
 	'runtimes' => 'html5,silverlight,flash,html4',
@@ -1579,6 +1789,13 @@
 if ( wp_is_mobile() )
 	$plupload_init['multi_selection'] = false;
 
+/**
+ * Filter the default Plupload settings.
+ *
+ * @since 3.3.0
+ *
+ * @param array $plupload_init An array of default settings used by Plupload.
+ */
 $plupload_init = apply_filters( 'plupload_init', $plupload_init );
 
 ?>
@@ -1598,7 +1815,16 @@
 </script>
 
 <div id="plupload-upload-ui" class="hide-if-no-js">
-<?php do_action('pre-plupload-upload-ui'); // hook change, old name: 'pre-flash-upload-ui' ?>
+<?php
+/**
+ * Fires before the upload interface loads.
+ *
+ * Previously named 'pre-flash-upload-ui'.
+ *
+ * @since 3.3.0
+ * @since 3.5.0
+ */
+do_action('pre-plupload-upload-ui'); // hook change, old name: 'pre-flash-upload-ui' ?>
 <div id="drag-drop-area">
 	<div class="drag-drop-inside">
 	<p class="drag-drop-info"><?php _e('Drop files here'); ?></p>
@@ -1606,11 +1832,27 @@
 	<p class="drag-drop-buttons"><input id="plupload-browse-button" type="button" value="<?php esc_attr_e('Select Files'); ?>" class="button" /></p>
 	</div>
 </div>
-<?php do_action('post-plupload-upload-ui'); // hook change, old name: 'post-flash-upload-ui' ?>
+<?php
+/**
+ * Fires after the upload interface loads.
+ *
+ * Previously named 'post-flash-upload-ui'.
+ *
+ * @since 3.3.0
+ * @since 3.5.0
+ */
+do_action( 'post-plupload-upload-ui' ); ?>
 </div>
 
 <div id="html-upload-ui" class="hide-if-js">
-<?php do_action('pre-html-upload-ui'); ?>
+	<?php
+	/**
+	 * Fires before the upload button in the media upload interface.
+	 *
+	 * @since 2.6.0
+	 */
+	do_action( 'pre-html-upload-ui' );
+	?>
 	<p id="async-upload-wrap">
 		<label class="screen-reader-text" for="async-upload"><?php _e('Upload'); ?></label>
 		<input type="file" name="async-upload" id="async-upload" />
@@ -1618,7 +1860,14 @@
 		<a href="#" onclick="try{top.tb_remove();}catch(e){}; return false;"><?php _e('Cancel'); ?></a>
 	</p>
 	<div class="clear"></div>
-<?php do_action('post-html-upload-ui'); ?>
+<?php
+/**
+ * Fires after the upload button in the media upload interface.
+ *
+ * @since 2.6.0
+ */
+do_action( 'post-html-upload-ui' );
+?>
 </div>
 
 <span class="max-upload-size"><?php printf( __( 'Maximum upload file size: %d%s.' ), esc_html($upload_size_unit), esc_html($sizes[$u]) ); ?></span>
@@ -1627,7 +1876,15 @@
 	<span class="big-file-warning"><?php _e('Your browser has some limitations uploading large files with the multi-file uploader. Please use the browser uploader for files over 100MB.'); ?></span>
 <?php }
 
-	do_action('post-upload-ui');
+	/**
+	 * Fires on the post upload UI screen.
+	 *
+	 * Legacy (pre-3.5) media workflow hook.
+	 *
+	 * @since 2.6.0
+	 * @since 3.5.0
+	 */
+	do_action( 'post-upload-ui' );
 }
 
 /**
@@ -1646,6 +1903,15 @@
 	$post_id = isset( $_REQUEST['post_id'] )? intval( $_REQUEST['post_id'] ) : 0;
 
 	$form_action_url = admin_url("media-upload.php?type=$type&tab=type&post_id=$post_id");
+
+	/**
+	 * Filter the media upload form action URL.
+	 *
+	 * @since 2.6.0
+	 *
+	 * @param string $form_action_url The media upload form action URL.
+	 * @param string $type                The type of media. Default 'file'.
+	 */
 	$form_action_url = apply_filters('media_upload_form_url', $form_action_url, $type);
 	$form_class = 'media-upload-form type-form validate';
 
@@ -1711,6 +1977,7 @@
 	$post_id = isset( $_REQUEST['post_id'] ) ? intval( $_REQUEST['post_id'] ) : 0;
 
 	$form_action_url = admin_url("media-upload.php?type=$type&tab=type&post_id=$post_id");
+	//duplicate_hook
 	$form_action_url = apply_filters('media_upload_form_url', $form_action_url, $type);
 	$form_class = 'media-upload-form type-form validate';
 
@@ -1741,7 +2008,10 @@
 		if ( f.alt.value )
 			alt = f.alt.value.replace(/'/g, '&#039;').replace(/"/g, '&quot;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
 
-<?php if ( ! apply_filters( 'disable_captions', '' ) ) { ?>
+<?php
+	//duplicate_hook
+	if ( ! apply_filters( 'disable_captions', '' ) ) {
+		?>
 		if ( f.caption.value ) {
 			caption = f.caption.value.replace(/\r\n|\r/g, '\n');
 			caption = caption.replace(/<[a-zA-Z0-9]+( [^<>]+)?>/g, function(a){
@@ -1818,7 +2088,17 @@
 
 <div id="media-items">
 <div class="media-item media-blank">
-<?php echo apply_filters( 'type_url_form_media', wp_media_insert_url_form( $type ) ); ?>
+<?php
+$form_html = wp_media_insert_url_form( $type );
+/**
+ * Filter the insert from URL form HTML.
+ *
+ * @since 3.3.0
+ *
+ * @param string $form_html The insert from URL form HTML.
+ */
+echo apply_filters( 'type_url_form_media', $form_html );
+?>
 </div>
 </div>
 </form>
@@ -1840,6 +2120,7 @@
 
 	$post_id = intval($_REQUEST['post_id']);
 	$form_action_url = admin_url("media-upload.php?type=$type&tab=gallery&post_id=$post_id");
+	//duplicate_hook
 	$form_action_url = apply_filters('media_upload_form_url', $form_action_url, $type);
 	$form_class = 'media-upload-form validate';
 
@@ -1986,6 +2267,7 @@
 	$post_id = isset( $_REQUEST['post_id'] ) ? intval( $_REQUEST['post_id'] ) : 0;
 
 	$form_action_url = admin_url("media-upload.php?type=$type&tab=library&post_id=$post_id");
+	//duplicate_hook
 	$form_action_url = apply_filters('media_upload_form_url', $form_action_url, $type);
 	$form_class = 'media-upload-form validate';
 
@@ -2049,6 +2331,13 @@
 
 	$type_links[] = "<li><a href='" . esc_url(add_query_arg(array('post_mime_type'=>$mime_type, 'paged'=>false))) . "'$class>" . sprintf( translate_nooped_plural( $label[2], $num_posts[$mime_type] ), "<span id='$mime_type-counter'>" . number_format_i18n( $num_posts[$mime_type] ) . '</span>') . '</a>';
 }
+/**
+ * Filter the media upload mime type list items.
+ *
+ * @since 3.1.0
+ *
+ * @param array $type_links An array of list items containing mime type link HTML.
+ */
 echo implode(' | </li>', apply_filters( 'media_upload_mime_type_links', $type_links ) ) . '</li>';
 unset($type_links);
 ?>
@@ -2148,6 +2437,7 @@
  * @return string the form html
  */
 function wp_media_insert_url_form( $default_view = 'image' ) {
+	//duplicate_hook
 	if ( !apply_filters( 'disable_captions', '' ) ) {
 		$caption = '
 		<tr class="image-only">
@@ -2430,6 +2720,7 @@
 	$meta = wp_get_attachment_metadata( $post->ID );
 	if ( isset( $meta['width'], $meta['height'] ) )
 		$media_dims .= "<span id='media-dims-$post->ID'>{$meta['width']}&nbsp;&times;&nbsp;{$meta['height']}</span> ";
+	//duplicate_hook
 	$media_dims = apply_filters( 'media_meta', $media_dims, $post );
 
 	$att_url = wp_get_attachment_url( $post->ID );
