mirror of https://code.videolan.org/videolan/vlc
630 lines
22 KiB
C
630 lines
22 KiB
C
/*****************************************************************************
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* vlc_filter.h: filter related structures and functions
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*****************************************************************************
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* Copyright (C) 1999-2014 VLC authors and VideoLAN
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*
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* Authors: Gildas Bazin <gbazin@videolan.org>
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* Antoine Cellerier <dionoea at videolan dot org>
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* Rémi Denis-Courmont
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifndef VLC_FILTER_H
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#define VLC_FILTER_H 1
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#include <vlc_es.h>
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#include <vlc_picture.h>
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#include <vlc_codec.h>
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typedef struct vlc_video_context vlc_video_context;
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struct vlc_audio_loudness;
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/**
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* \defgroup filter Filters
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* \ingroup output
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* Audio, video, text filters
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* @{
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* \file
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* Filter modules interface
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*/
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struct filter_video_callbacks
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{
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picture_t *(*buffer_new)(filter_t *);
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vlc_decoder_device * (*hold_device)(vlc_object_t *, void *sys);
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};
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struct filter_audio_callbacks
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{
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struct
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{
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void (*on_changed)(filter_t *,
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const struct vlc_audio_loudness *loudness);
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} meter_loudness;
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};
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struct filter_subpicture_callbacks
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{
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subpicture_t *(*buffer_new)(filter_t *);
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};
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typedef struct filter_owner_t
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{
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union
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{
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const struct filter_video_callbacks *video;
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const struct filter_audio_callbacks *audio;
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const struct filter_subpicture_callbacks *sub;
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};
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/* Input attachments
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* XXX use filter_GetInputAttachments */
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int (*pf_get_attachments)( filter_t *, input_attachment_t ***, int * );
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void *sys;
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} filter_owner_t;
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struct vlc_mouse_t;
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struct vlc_filter_operations
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{
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/* Operation depending on the type of filter. */
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union
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{
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/** Filter a picture (video filter) */
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picture_t * (*filter_video)(filter_t *, picture_t *);
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/** Filter an audio block (audio filter) */
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block_t * (*filter_audio)(filter_t *, block_t *);
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/** Blend a subpicture onto a picture (video blending) */
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void (*blend_video)(filter_t *, picture_t *, const picture_t *,
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int, int, int);
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/** Generate a subpicture (sub source) */
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subpicture_t *(*source_sub)(filter_t *, vlc_tick_t);
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/** Filter a subpicture (sub filter) */
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subpicture_t *(*filter_sub)(filter_t *, subpicture_t *);
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/** Render text (text renderer)
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*
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* \return a picture-based region or NULL
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*/
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subpicture_region_t * (*render)(filter_t *,
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const subpicture_region_t *, const vlc_fourcc_t *);
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};
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union
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{
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/* TODO: video filter drain */
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/** Drain (audio filter) */
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block_t *(*drain_audio)(filter_t *);
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};
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/** Flush
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*
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* Flush (i.e. discard) any internal buffer in a video or audio filter.
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*/
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void (*flush)(filter_t *);
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/** Change viewpoint
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*
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* Pass a new viewpoint to audio filters. Filters like the spatialaudio one
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* used for Ambisonics rendering will change its output according to this
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* viewpoint.
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*/
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void (*change_viewpoint)(filter_t *, const vlc_viewpoint_t *);
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/** Filter mouse state (video filter).
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*
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* If non-NULL, you must convert from output to input formats:
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* - If VLC_SUCCESS is returned, the mouse state is propagated.
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* - Otherwise, the mouse change is not propagated.
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* If NULL, the mouse state is considered unchanged and will be
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* propagated. */
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int (*video_mouse)(filter_t *, struct vlc_mouse_t *,
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const struct vlc_mouse_t *p_old);
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/** Close the filter and release its resources. */
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void (*close)(filter_t *);
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};
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typedef int (*vlc_open_deinterlace)(filter_t *);
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typedef int (*vlc_video_converter_open)(filter_t *);
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typedef int (*vlc_video_filter_open)(filter_t *);
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typedef int (*vlc_video_text_renderer_open)(filter_t *);
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typedef int (*vlc_video_sub_filter_open)(filter_t *);
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typedef int (*vlc_video_sub_source_open)(filter_t *);
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typedef int (*vlc_video_blending_open)(filter_t *);
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#define set_deinterlace_callback( activate ) \
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{ \
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vlc_open_deinterlace open__ = activate; \
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(void) open__; \
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set_callback(activate) \
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} \
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set_capability( "video filter", 0 ) \
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add_shortcut( "deinterlace" )
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#define set_callback_video_filter( activate ) \
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{ \
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vlc_video_filter_open open__ = activate; \
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(void) open__; \
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set_callback(activate) \
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} \
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set_capability( "video filter", 0 )
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#define set_callback_video_converter( activate, priority ) \
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{ \
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vlc_video_converter_open open__ = activate; \
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(void) open__; \
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set_callback(activate) \
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} \
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set_capability( "video converter", priority )
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#define set_callback_text_renderer( activate, priority ) \
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{ \
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vlc_video_text_renderer_open open__ = activate; \
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(void) open__; \
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set_callback(activate) \
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} \
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set_capability( "text renderer", priority )
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#define set_callback_sub_filter( activate ) \
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{ \
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vlc_video_sub_filter_open open__ = activate; \
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(void) open__; \
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set_callback(activate) \
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} \
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set_capability( "sub filter", 0 )
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#define set_callback_sub_source( activate, priority ) \
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{ \
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vlc_video_sub_source_open open__ = activate; \
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(void) open__; \
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set_callback(activate) \
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} \
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set_capability( "sub source", priority )
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#define set_callback_video_blending( activate, priority ) \
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{ \
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vlc_video_blending_open open__ = activate; \
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(void) open__; \
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set_callback(activate) \
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} \
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set_capability( "video blending", priority )
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/** Structure describing a filter
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* @warning BIG FAT WARNING : the code relies on the first 4 members of
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* filter_t and decoder_t to be the same, so if you have anything to add,
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* do it at the end of the structure.
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*/
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struct filter_t
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{
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struct vlc_object_t obj;
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/* Module properties */
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module_t * p_module;
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void *p_sys;
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/* Input format */
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es_format_t fmt_in;
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vlc_video_context *vctx_in; // video filter, set by owner
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/* Output format of filter */
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es_format_t fmt_out;
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vlc_video_context *vctx_out; // video filter, handled by the filter
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bool b_allow_fmt_out_change;
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/* Name of the "video filter" shortcut that is requested, can be NULL */
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const char * psz_name;
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/* Filter configuration */
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const config_chain_t *p_cfg;
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/* Implementation of filter API */
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const struct vlc_filter_operations *ops;
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/** Private structure for the owner of the filter */
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filter_owner_t owner;
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};
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static inline void filter_Close( filter_t *p_filter )
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{
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if ( p_filter->ops->close )
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p_filter->ops->close( p_filter );
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}
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/**
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* This function will return a new picture usable by p_filter as an output
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* buffer. You have to release it using picture_Release or by returning
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* it to the caller as a ops->filter_video return value.
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* Provided for convenience.
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*
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* \param p_filter filter_t object
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* \return new picture on success or NULL on failure
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*/
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static inline picture_t *filter_NewPicture( filter_t *p_filter )
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{
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picture_t *pic = NULL;
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if ( p_filter->owner.video != NULL && p_filter->owner.video->buffer_new != NULL)
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pic = p_filter->owner.video->buffer_new( p_filter );
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if ( pic == NULL )
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{
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// legacy filter owners not setting a default filter_allocator
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pic = picture_NewFromFormat( &p_filter->fmt_out.video );
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}
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if( pic == NULL )
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msg_Warn( p_filter, "can't get output picture" );
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return pic;
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}
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/**
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* Flush a filter
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*
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* This function will flush the state of a filter (audio or video).
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*/
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static inline void filter_Flush( filter_t *p_filter )
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{
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if( p_filter->ops->flush != NULL )
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p_filter->ops->flush( p_filter );
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}
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static inline void filter_ChangeViewpoint( filter_t *p_filter,
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const vlc_viewpoint_t *vp)
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{
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if( p_filter->ops->change_viewpoint != NULL )
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p_filter->ops->change_viewpoint( p_filter, vp );
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}
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static inline vlc_decoder_device * filter_HoldDecoderDevice( filter_t *p_filter )
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{
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if ( !p_filter->owner.video || !p_filter->owner.video->hold_device )
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return NULL;
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return p_filter->owner.video->hold_device( VLC_OBJECT(p_filter), p_filter->owner.sys );
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}
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static inline vlc_decoder_device * filter_HoldDecoderDeviceType( filter_t *p_filter,
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enum vlc_decoder_device_type type )
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{
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if ( !p_filter->owner.video || !p_filter->owner.video->hold_device )
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return NULL;
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vlc_decoder_device *dec_dev = p_filter->owner.video->hold_device( VLC_OBJECT(p_filter),
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p_filter->owner.sys );
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if ( dec_dev != NULL )
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{
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if ( dec_dev->type == type )
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return dec_dev;
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vlc_decoder_device_Release(dec_dev);
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}
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return NULL;
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}
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/**
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* This function will drain, then flush an audio filter.
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*/
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static inline block_t *filter_DrainAudio( filter_t *p_filter )
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{
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if( p_filter->ops->drain_audio )
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return p_filter->ops->drain_audio( p_filter );
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else
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return NULL;
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}
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static inline void filter_SendAudioLoudness(filter_t *filter,
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const struct vlc_audio_loudness *loudness)
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{
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assert(filter->owner.audio->meter_loudness.on_changed);
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filter->owner.audio->meter_loudness.on_changed(filter, loudness);
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}
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/**
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* This function will return a new subpicture usable by p_filter as an output
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* buffer. You have to release it using subpicture_Delete or by returning it to
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* the caller as a ops->sub_source return value.
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* Provided for convenience.
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*
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* \param p_filter filter_t object
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* \return new subpicture
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*/
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static inline subpicture_t *filter_NewSubpicture( filter_t *p_filter )
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{
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subpicture_t *subpic = p_filter->owner.sub->buffer_new( p_filter );
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if( subpic == NULL )
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msg_Warn( p_filter, "can't get output subpicture" );
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return subpic;
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}
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/**
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* This function gives all input attachments at once.
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*
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* You MUST release the returned values
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*/
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static inline int filter_GetInputAttachments( filter_t *p_filter,
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input_attachment_t ***ppp_attachment,
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int *pi_attachment )
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{
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if( !p_filter->owner.pf_get_attachments )
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return VLC_EGENERIC;
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return p_filter->owner.pf_get_attachments( p_filter,
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ppp_attachment, pi_attachment );
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}
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/**
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* This function duplicates every variables from the filter, and adds a proxy
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* callback to trigger filter events from obj.
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*
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* \param obj the object to add the callback proxy to
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* \param filter the filter object for which the callback will be proxified
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* \param restart_cb a vlc_callback_t to call if the event means restarting the
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* filter (i.e. an event on a non-command variable)
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*/
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VLC_API void filter_AddProxyCallbacks( vlc_object_t *obj, filter_t *filter,
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vlc_callback_t restart_cb );
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# define filter_AddProxyCallbacks(a, b, c) \
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filter_AddProxyCallbacks(VLC_OBJECT(a), b, c)
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/**
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* This function removes the callbacks previously added to every duplicated
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* variables, and removes them afterward.
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*
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* \param obj the object to remove the callback proxy from
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* \param filter the filter object for which the callback was proxified
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* \param restart_cb the same vlc_callback_t passed to filter_AddProxyCallbacks
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*/
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VLC_API void filter_DelProxyCallbacks( vlc_object_t *obj, filter_t *filter,
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vlc_callback_t restart_cb);
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# define filter_DelProxyCallbacks(a, b, c) \
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filter_DelProxyCallbacks(VLC_OBJECT(a), b, c)
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typedef filter_t vlc_blender_t;
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/**
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* It creates a blend filter.
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*
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* Only the chroma properties of the dest format is used (chroma
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* type, rgb masks and shifts)
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*/
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VLC_API vlc_blender_t * filter_NewBlend( vlc_object_t *, const video_format_t *p_dst_chroma ) VLC_USED;
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/**
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* It configures blend filter parameters that are allowed to changed
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* after the creation.
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*/
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VLC_API int filter_ConfigureBlend( vlc_blender_t *, int i_dst_width, int i_dst_height, const video_format_t *p_src );
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/**
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* It blends a picture into another one.
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*
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* The input picture is not modified and not released.
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*/
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VLC_API int filter_Blend( vlc_blender_t *, picture_t *p_dst, int i_dst_x, int i_dst_y, const picture_t *p_src, int i_alpha );
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/**
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* It destroys a blend filter created by filter_NewBlend.
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*/
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VLC_API void filter_DeleteBlend( vlc_blender_t * );
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/**
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* Create a picture_t *(*)( filter_t *, picture_t * ) compatible wrapper
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* using a void (*)( filter_t *, picture_t *, picture_t * ) function
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*
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* Currently used by the chroma video filters
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*/
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#define VIDEO_FILTER_WRAPPER_CLOSE_FILT( name, close_cb ) \
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static picture_t *name ## _Filter ( filter_t *p_filter, \
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picture_t *p_pic ) \
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{ \
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picture_t *p_outpic = filter_NewPicture( p_filter ); \
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if( p_outpic ) \
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{ \
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name( p_filter, p_pic, p_outpic ); \
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picture_CopyProperties( p_outpic, p_pic ); \
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} \
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picture_Release( p_pic ); \
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return p_outpic; \
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} \
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static const struct vlc_filter_operations name ## _ops = { \
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.filter_video = name ## _Filter, .close = close_cb, \
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};
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#define VIDEO_FILTER_WRAPPER_CLOSE( name, close_cb ) \
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static void name (filter_t *, picture_t *, picture_t *); \
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static void close_cb (filter_t *); \
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VIDEO_FILTER_WRAPPER_CLOSE_FILT( name, close_cb )
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#define VIDEO_FILTER_WRAPPER( name ) \
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static void name (filter_t *, picture_t *, picture_t *); \
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VIDEO_FILTER_WRAPPER_CLOSE_FILT( name, NULL )
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/**
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* Wrappers to use when the filter function is not a static function
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*/
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#define VIDEO_FILTER_WRAPPER_EXT( name ) \
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void name (filter_t *, picture_t *, picture_t *); \
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VIDEO_FILTER_WRAPPER_CLOSE_FILT( name, NULL )
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#define VIDEO_FILTER_WRAPPER_CLOSE_EXT( name, close_cb ) \
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void name (filter_t *, picture_t *, picture_t *); \
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static void close_cb (filter_t *); \
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VIDEO_FILTER_WRAPPER_CLOSE_FILT( name, close_cb )
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/**
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* Filter chain management API
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* The filter chain management API is used to dynamically construct filters
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* and add them in a chain.
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*/
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typedef struct filter_chain_t filter_chain_t;
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/**
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* Create new filter chain
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*
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* \param obj pointer to a vlc object
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* \param psz_capability vlc capability of filters in filter chain
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* \return pointer to a filter chain
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*/
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filter_chain_t * filter_chain_NewSPU(vlc_object_t *obj, const char *psz_capability)
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VLC_USED;
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#define filter_chain_NewSPU( a, b ) filter_chain_NewSPU( VLC_OBJECT( a ), b )
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/**
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* Creates a new video filter chain.
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*
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* \param obj pointer to parent VLC object
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* \param change whether to allow changing the output format
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* \param owner owner video buffer callbacks
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* \return new filter chain, or NULL on error
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*/
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VLC_API filter_chain_t * filter_chain_NewVideo( vlc_object_t *obj, bool change,
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const filter_owner_t *owner )
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VLC_USED;
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#define filter_chain_NewVideo( a, b, c ) \
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filter_chain_NewVideo( VLC_OBJECT( a ), b, c )
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/**
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* Delete filter chain will delete all filters in the chain and free all
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* allocated data. The pointer to the filter chain is then no longer valid.
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*
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* \param chain pointer to filter chain
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*/
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VLC_API void filter_chain_Delete(filter_chain_t *chain);
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/**
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* 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 vctx_in new input video context
|
|
* \param p_fmt_out new fmt_out params
|
|
*/
|
|
VLC_API void filter_chain_Reset( filter_chain_t *p_chain,
|
|
const es_format_t *p_fmt_in,
|
|
vlc_video_context *vctx_in,
|
|
const es_format_t *p_fmt_out );
|
|
|
|
/**
|
|
* Remove all existing filters
|
|
*
|
|
* \param p_chain pointer to filter chain
|
|
*/
|
|
VLC_API void filter_chain_Clear(filter_chain_t *);
|
|
|
|
/**
|
|
* Append a filter to the chain.
|
|
*
|
|
* \param chain filter chain to append a filter to
|
|
* \param name filter name
|
|
* \param cfg the configuration chain for the filter
|
|
* \param fmt_out filter output format
|
|
* \return a pointer to the filter or NULL on error
|
|
*/
|
|
VLC_API filter_t *filter_chain_AppendFilter(filter_chain_t *chain,
|
|
const char *name, const config_chain_t *cfg,
|
|
const es_format_t *fmt_out);
|
|
|
|
/**
|
|
* Append a conversion to the chain.
|
|
*
|
|
* \param chain filter chain to append a filter to
|
|
* \param fmt_out filter output format
|
|
* \retval VLC_SUCCESS on success
|
|
*/
|
|
VLC_API int filter_chain_AppendConverter(filter_chain_t *chain,
|
|
const es_format_t *fmt_out);
|
|
|
|
/**
|
|
* Append new filter to filter chain from string.
|
|
*
|
|
* \param chain filter chain to append a filter to
|
|
* \param str filters chain nul-terminated string
|
|
*/
|
|
VLC_API int filter_chain_AppendFromString(filter_chain_t *chain,
|
|
const char *str);
|
|
|
|
/**
|
|
* 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 chain filter chain to remove the filter from
|
|
* \param filter filter to remove from the chain and delete
|
|
*
|
|
* \note the filter must be created with filter_chain_AppendConverter() or
|
|
* filter_chain_AppendFilter().
|
|
*/
|
|
VLC_API void filter_chain_DeleteFilter(filter_chain_t *chain,
|
|
filter_t *filter);
|
|
|
|
/**
|
|
* Checks if the filter chain is empty.
|
|
*
|
|
* \param chain pointer to filter chain
|
|
* \return true if and only if there are no filters in this filter chain
|
|
*/
|
|
VLC_API bool filter_chain_IsEmpty(const filter_chain_t *chain);
|
|
|
|
/**
|
|
* Get last output format of the last element in the filter chain.
|
|
*
|
|
* \param chain filter chain
|
|
*/
|
|
VLC_API const es_format_t *filter_chain_GetFmtOut(const filter_chain_t *chain);
|
|
|
|
/**
|
|
* Get last output video context of the last element in the filter chain.
|
|
* \note doesn't create change the reference count
|
|
*
|
|
* \param chain filter chain
|
|
*/
|
|
VLC_API vlc_video_context *filter_chain_GetVideoCtxOut(const filter_chain_t *chain);
|
|
|
|
/**
|
|
* Apply the filter chain to a video picture.
|
|
*
|
|
* \param chain pointer to filter chain
|
|
* \param pic picture to apply filters to
|
|
* \return modified picture after applying all video filters
|
|
*/
|
|
VLC_API picture_t *filter_chain_VideoFilter(filter_chain_t *chain,
|
|
picture_t *pic);
|
|
|
|
/**
|
|
* Flush a video filter chain.
|
|
*/
|
|
VLC_API void filter_chain_VideoFlush( filter_chain_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 *, struct vlc_mouse_t *,
|
|
const struct vlc_mouse_t * );
|
|
|
|
VLC_API int filter_chain_ForEach( filter_chain_t *chain,
|
|
int (*cb)( filter_t *, void * ), void *opaque );
|
|
|
|
/** @} */
|
|
#endif /* _VLC_FILTER_H */
|