+/**
+ * This function will return a new picture usable by p_filter as an output
+ * buffer. You have to release it using picture_Release or by returning
+ * it to the caller as a pf_video_filter return value.
+ * Provided for convenience.
+ *
+ * \param p_filter filter_t object
+ * \return new picture on success or NULL on failure
+ */
+static inline picture_t *filter_NewPicture( filter_t *p_filter )
+{
+ picture_t *pic = p_filter->owner.video.buffer_new( p_filter );
+ if( pic == NULL )
+ msg_Warn( p_filter, "can't get output picture" );
+ return pic;
+}
+
+/**
+ * This function will flush the state of a video filter.
+ */
+static inline void filter_FlushPictures( filter_t *p_filter )
+{
+ if( p_filter->pf_video_flush )
+ p_filter->pf_video_flush( p_filter );
+}
+
+/**
+ * This function will return a new subpicture usable by p_filter as an output
+ * buffer. You have to release it using subpicture_Delete or by returning it to
+ * the caller as a pf_sub_source return value.
+ * Provided for convenience.
+ *
+ * \param p_filter filter_t object
+ * \return new subpicture
+ */
+static inline subpicture_t *filter_NewSubpicture( filter_t *p_filter )
+{
+ subpicture_t *subpic = p_filter->owner.sub.buffer_new( p_filter );
+ if( subpic == NULL )
+ msg_Warn( p_filter, "can't get output subpicture" );
+ return subpic;
+}
+
+/**
+ * This function gives all input attachments at once.
+ *
+ * You MUST release the returned values
+ */
+static inline int filter_GetInputAttachments( filter_t *p_filter,
+ input_attachment_t ***ppp_attachment,
+ int *pi_attachment )
+{
+ if( !p_filter->pf_get_attachments )
+ return VLC_EGENERIC;
+ return p_filter->pf_get_attachments( p_filter,
+ ppp_attachment, pi_attachment );
+}
+
+/**
+ * It creates a blend filter.
+ *
+ * Only the chroma properties of the dest format is used (chroma
+ * type, rgb masks and shifts)
+ */
+VLC_API filter_t * filter_NewBlend( vlc_object_t *, const video_format_t *p_dst_chroma ) VLC_USED;
+
+/**
+ * It configures blend filter parameters that are allowed to changed
+ * after the creation.
+ */
+VLC_API int filter_ConfigureBlend( filter_t *, int i_dst_width, int i_dst_height, const video_format_t *p_src );
+
+/**
+ * It blends a picture into another one.
+ *
+ * The input picture is not modified and not released.
+ */
+VLC_API int filter_Blend( filter_t *, picture_t *p_dst, int i_dst_x, int i_dst_y, const picture_t *p_src, int i_alpha );
+
+/**
+ * It destroys a blend filter created by filter_NewBlend.
+ */
+VLC_API void filter_DeleteBlend( filter_t * );
+
+/**
+ * Create a picture_t *(*)( filter_t *, picture_t * ) compatible wrapper
+ * using a void (*)( filter_t *, picture_t *, picture_t * ) function
+ *
+ * Currently used by the chroma video filters
+ */
+#define VIDEO_FILTER_WRAPPER( name ) \
+ static picture_t *name ## _Filter ( filter_t *p_filter, \
+ picture_t *p_pic ) \
+ { \
+ picture_t *p_outpic = filter_NewPicture( p_filter ); \
+ if( p_outpic ) \
+ { \
+ name( p_filter, p_pic, p_outpic ); \
+ picture_CopyProperties( p_outpic, p_pic ); \
+ } \
+ picture_Release( p_pic ); \
+ return p_outpic; \
+ }
+
+/**
+ * Filter chain management API
+ * The filter chain management API is used to dynamically construct filters
+ * and add them in a chain.
+ */
+
+typedef struct filter_chain_t filter_chain_t;
+
+/**
+ * Create new filter chain
+ *
+ * \param p_object pointer to a vlc object
+ * \param psz_capability vlc capability of filters in filter chain
+ * \param b_allow_format_fmt_change allow changing of fmt
+ * \return pointer to a filter chain
+ */
+VLC_API filter_chain_t * filter_chain_New( vlc_object_t *, const char *, bool )
+VLC_USED;
+#define filter_chain_New( a, b, c ) filter_chain_New( VLC_OBJECT( a ), b, c )
+
+/**
+ * Creates a new video filter chain.
+ *
+ * \param obj pointer to parent VLC object
+ * \param change whether to allow changing the output format
+ * \param owner owner video buffer callbacks
+ * \return new filter chain, or NULL on error
+ */
+VLC_API filter_chain_t * filter_chain_NewVideo( vlc_object_t *obj, bool change,
+ const filter_owner_t *owner )
+VLC_USED;
+#define filter_chain_NewVideo( a, b, c ) \
+ filter_chain_NewVideo( VLC_OBJECT( a ), b, c )
+
+/**
+ * Delete filter chain will delete all filters in the chain and free all
+ * allocated data. The pointer to the filter chain is then no longer valid.
+ *
+ * \param p_chain pointer to filter chain
+ */
+VLC_API void filter_chain_Delete( filter_chain_t * );
+
+/**
+ * Reset filter chain will delete all filters in the chain and
+ * reset p_fmt_in and p_fmt_out to the new values.
+ *
+ * \param p_chain pointer to filter chain
+ * \param p_fmt_in new fmt_in params
+ * \param p_fmt_out new fmt_out params
+ */
+VLC_API void filter_chain_Reset( filter_chain_t *, const es_format_t *, const es_format_t * );
+
+/**
+ * Append filter to the end of the chain.
+ *
+ * \param p_chain pointer to filter chain
+ * \param psz_name name of filter
+ * \param p_cfg
+ * \param p_fmt_in input es_format_t
+ * \param p_fmt_out output es_format_t
+ * \return pointer to filter chain
+ */
+VLC_API filter_t * filter_chain_AppendFilter( filter_chain_t *, const char *, config_chain_t *, const es_format_t *, const es_format_t * );
+
+/**
+ * Append new filter to filter chain from string.
+ *
+ * \param p_chain pointer to filter chain
+ * \param psz_string string of filters
+ * \return 0 for success
+ */
+VLC_API int filter_chain_AppendFromString( filter_chain_t *, const char * );
+
+/**
+ * Delete filter from filter chain. This function also releases the filter
+ * object and unloads the filter modules. The pointer to p_filter is no
+ * longer valid after this function successfully returns.
+ *
+ * \param p_chain pointer to filter chain
+ * \param p_filter pointer to filter object
+ */
+VLC_API void filter_chain_DeleteFilter( filter_chain_t *, filter_t * );
+
+/**
+ * Get the number of filters in the filter chain.
+ *
+ * \param p_chain pointer to filter chain
+ * \return number of filters in this filter chain
+ */
+VLC_API int filter_chain_GetLength( filter_chain_t * );
+
+/**
+ * Get last p_fmt_out in the chain.
+ *
+ * \param p_chain pointer to filter chain
+ * \return last p_fmt (es_format_t) of this filter chain
+ */
+VLC_API const es_format_t * filter_chain_GetFmtOut( filter_chain_t * );
+
+/**
+ * Apply the filter chain to a video picture.
+ *
+ * \param p_chain pointer to filter chain
+ * \param p_picture picture to apply filters on
+ * \return modified picture after applying all video filters
+ */
+VLC_API picture_t * filter_chain_VideoFilter( filter_chain_t *, picture_t * );
+
+/**
+ * Flush a video filter chain.
+ */
+VLC_API void filter_chain_VideoFlush( filter_chain_t * );
+
+/**
+ * Apply the filter chain to a audio block.
+ *
+ * \param p_chain pointer to filter chain
+ * \param p_block audio frame to apply filters on
+ * \return modified audio frame after applying all audio filters
+ */
+VLC_API block_t * filter_chain_AudioFilter( filter_chain_t *, block_t * );
+
+/**
+ * Apply filter chain to subpictures.
+ *
+ * \param p_chain pointer to filter chain
+ * \param display_date of subpictures
+ */
+void filter_chain_SubSource( filter_chain_t *, spu_t *, mtime_t );
+
+/**
+ * Apply filter chain to subpictures.
+ *
+ * \param p_chain pointer to filter chain
+ * \param p_subpicture subpicture to apply filters on
+ * \return modified subpicture after applying all subpicture filters
+ */
+VLC_API subpicture_t * filter_chain_SubFilter( filter_chain_t *, subpicture_t * );
+
+/**
+ * Apply the filter chain to a mouse state.
+ *
+ * It will be applied from the output to the input. It makes sense only
+ * for a video filter chain.
+ *
+ * The vlc_mouse_t* pointers may be the same.
+ */
+VLC_API int filter_chain_MouseFilter( filter_chain_t *, vlc_mouse_t *, const vlc_mouse_t * );
+
+/**
+ * Inform the filter chain of mouse state.
+ *
+ * It makes sense only for a sub source chain.
+ */
+VLC_API int filter_chain_MouseEvent( filter_chain_t *, const vlc_mouse_t *, const video_format_t * );
+
+int filter_chain_ForEach( filter_chain_t *chain,
+ int (*cb)( filter_t *, void * ), void *opaque );
+