vlc_filter.h
资源名称:vlc-1.0.5.zip [点击查看]
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上传日期:2020-07-06
资源大小:29949k
文件大小:11k
源码类别:
midi
开发平台:
Unix_Linux
- /*****************************************************************************
- * vlc_filter.h: filter related structures and functions
- *****************************************************************************
- * Copyright (C) 1999-2008 the VideoLAN team
- * $Id: a7404a74cee114d1ee4363977e7e5de4dc47ec0e $
- *
- * Authors: Gildas Bazin <gbazin@videolan.org>
- * Antoine Cellerier <dionoea at videolan dot org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
- *****************************************************************************/
- #ifndef VLC_FILTER_H
- #define VLC_FILTER_H 1
- #include <vlc_es.h>
- /**
- * file
- * This file defines the structure and types used by video and audio filters
- */
- typedef struct filter_owner_sys_t filter_owner_sys_t;
- /** Structure describing a filter
- * @warning BIG FAT WARNING : the code relies on the first 4 members of
- * filter_t and decoder_t to be the same, so if you have anything to add,
- * do it at the end of the structure.
- */
- struct filter_t
- {
- VLC_COMMON_MEMBERS
- /* Module properties */
- module_t * p_module;
- filter_sys_t * p_sys;
- /* Input format */
- es_format_t fmt_in;
- /* Output format of filter */
- es_format_t fmt_out;
- bool b_allow_fmt_out_change;
- /* Filter configuration */
- config_chain_t * p_cfg;
- picture_t * ( * pf_video_filter ) ( filter_t *, picture_t * );
- block_t * ( * pf_audio_filter ) ( filter_t *, block_t * );
- void ( * pf_video_blend ) ( filter_t *,
- picture_t *, picture_t *,
- int, int, int );
- subpicture_t * ( *pf_sub_filter ) ( filter_t *, mtime_t );
- int ( *pf_render_text ) ( filter_t *, subpicture_region_t *,
- subpicture_region_t * );
- int ( *pf_render_html ) ( filter_t *, subpicture_region_t *,
- subpicture_region_t * );
- /*
- * Buffers allocation
- */
- /* Audio output callbacks */
- block_t * ( * pf_audio_buffer_new) ( filter_t *, int );
- /* Video output callbacks */
- picture_t * ( * pf_vout_buffer_new) ( filter_t * );
- void ( * pf_vout_buffer_del) ( filter_t *, picture_t * );
- /* void ( * pf_picture_link) ( picture_t * );
- void ( * pf_picture_unlink) ( picture_t * ); */
- /* SPU output callbacks */
- subpicture_t * ( * pf_sub_buffer_new) ( filter_t * );
- void ( * pf_sub_buffer_del) ( filter_t *, subpicture_t * );
- /* Private structure for the owner of the decoder */
- filter_owner_sys_t *p_owner;
- };
- /**
- * This function will return a new picture usable by p_filter as an output
- * buffer. You have to release it using filter_DeletePicture 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 *p_picture = p_filter->pf_vout_buffer_new( p_filter );
- if( !p_picture )
- msg_Warn( p_filter, "can't get output picture" );
- return p_picture;
- }
- /**
- * This function will release a picture create by filter_NewPicture.
- * Provided for convenience.
- *
- * param p_filter filter_t object
- * param p_picture picture to be deleted
- */
- static inline void filter_DeletePicture( filter_t *p_filter, picture_t *p_picture )
- {
- p_filter->pf_vout_buffer_del( p_filter, p_picture );
- }
- /**
- * This function will return a new subpicture usable by p_filter as an output
- * buffer. You have to release it using filter_DeleteSubpicture or by returning
- * it to the caller as a pf_sub_filter 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 *p_subpicture = p_filter->pf_sub_buffer_new( p_filter );
- if( !p_subpicture )
- msg_Warn( p_filter, "can't get output subpicture" );
- return p_subpicture;
- }
- /**
- * This function will release a subpicture create by filter_NewSubicture.
- * Provided for convenience.
- *
- * param p_filter filter_t object
- * param p_subpicture to be released
- */
- static inline void filter_DeleteSubpicture( filter_t *p_filter, subpicture_t *p_subpicture )
- {
- p_filter->pf_sub_buffer_del( p_filter, p_subpicture );
- }
- /**
- * This function will return a new audio buffer usable by p_filter as an
- * output buffer. You have to release it using block_Release or by returning
- * it to the caller as a pf_audio_filter return value.
- * Provided for convenience.
- *
- * param p_filter filter_t object
- * param i_size size of audio buffer requested
- * return block to be used as audio output buffer
- */
- static inline block_t *filter_NewAudioBuffer( filter_t *p_filter, int i_size )
- {
- block_t *p_block = p_filter->pf_audio_buffer_new( p_filter, i_size );
- if( !p_block )
- msg_Warn( p_filter, "can't get output block" );
- return p_block;
- }
- /**
- * 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
- * param pf_buffer_allocation_init callback function to initialize buffer allocations
- * param pf_buffer_allocation_clear callback function to clear buffer allocation initialization
- * param p_buffer_allocation_data pointer to private allocation data
- * return pointer to a filter chain
- */
- VLC_EXPORT( filter_chain_t *, __filter_chain_New, ( vlc_object_t *, const char *, bool, int (*)( filter_t *, void * ), void (*)( filter_t * ), void * ) );
- #define filter_chain_New( a, b, c, d, e, f ) __filter_chain_New( VLC_OBJECT( a ), b, c, d, e, f )
- /**
- * 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_EXPORT( 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_EXPORT( 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_EXPORT( 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_EXPORT( 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
- * return VLC_SUCCESS on succes, else VLC_EGENERIC
- */
- VLC_EXPORT( int, filter_chain_DeleteFilter, ( filter_chain_t *, filter_t * ) );
- /**
- * Get filter by name of position in the filter chain.
- *
- * param p_chain pointer to filter chain
- * param i_position position of filter in filter chain
- * param psz_name name of filter to get
- * return filter object based on position or name provided
- */
- VLC_EXPORT( filter_t *, filter_chain_GetFilter, ( filter_chain_t *, int, const char * ) );
- /**
- * 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_EXPORT( 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_EXPORT( 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_EXPORT( picture_t *, filter_chain_VideoFilter, ( filter_chain_t *, picture_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_EXPORT( 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
- */
- VLC_EXPORT( void, filter_chain_SubFilter, ( filter_chain_t *, mtime_t ) );
- #endif /* _VLC_FILTER_H */