1 /*****************************************************************************
2 * chain.c : chain multiple video filter modules as a last resort solution
3 *****************************************************************************
4 * Copyright (C) 2007-2008 the VideoLAN team
7 * Authors: Antoine Cellerier <dionoea at videolan dot org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
32 #include <vlc_common.h>
33 #include <vlc_plugin.h>
34 #include <vlc_filter.h>
36 /*****************************************************************************
38 *****************************************************************************/
39 static int Activate ( vlc_object_t * );
40 static void Destroy ( vlc_object_t * );
43 set_description( N_("Video filtering using a chain of video filter modules") )
44 set_capability( "video filter2", 1 )
45 set_callbacks( Activate, Destroy )
48 /*****************************************************************************
50 *****************************************************************************/
51 static picture_t *Chain ( filter_t *, picture_t * );
52 static int BufferAllocationInit ( filter_t *, void * );
54 static int BuildChromaResize( filter_t * );
55 static int BuildChromaChain( filter_t *p_filter );
57 static int CreateChain( filter_chain_t *p_chain, es_format_t *p_fmt_mid );
58 static void EsFormatMergeSize( es_format_t *p_dst,
59 const es_format_t *p_base,
60 const es_format_t *p_size );
62 static const vlc_fourcc_t pi_allowed_chromas[] = {
72 filter_chain_t *p_chain;
75 #define CHAIN_LEVEL_MAX 4
77 /*****************************************************************************
78 * Activate: allocate a chroma function
79 *****************************************************************************
80 * This function allocates and initializes a chroma function
81 *****************************************************************************/
82 static int Activate( vlc_object_t *p_this )
84 filter_t *p_filter = (filter_t *)p_this;
88 const bool b_chroma = p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma;
89 const bool b_resize = p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width ||
90 p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height;
92 /* XXX Remove check on b_resize to build chroma chain (untested) */
93 if( !b_chroma || !b_resize )
96 p_sys = p_filter->p_sys = malloc( sizeof( *p_sys ) );
100 memset( p_sys, 0, sizeof( *p_sys ) );
102 p_sys->p_chain = filter_chain_New( p_filter, "video filter2", false, BufferAllocationInit, NULL, p_filter );
103 if( !p_sys->p_chain )
108 filter_chain_Reset( p_sys->p_chain, &p_filter->fmt_in, &p_filter->fmt_out );
110 if( b_chroma && b_resize )
111 i_ret = BuildChromaResize( p_filter );
113 i_ret = BuildChromaChain( p_filter );
115 i_ret = VLC_EGENERIC;
119 /* Hum ... looks like this really isn't going to work. Too bad. */
120 filter_chain_Delete( p_sys->p_chain );
125 p_filter->pf_video_filter = Chain;
129 static void Destroy( vlc_object_t *p_this )
131 filter_t *p_filter = (filter_t *)p_this;
132 filter_chain_Delete( p_filter->p_sys->p_chain );
133 free( p_filter->p_sys );
136 /*****************************************************************************
138 *****************************************************************************/
139 static picture_t *Chain( filter_t *p_filter, picture_t *p_pic )
141 return filter_chain_VideoFilter( p_filter->p_sys->p_chain, p_pic );
144 /*****************************************************************************
146 *****************************************************************************/
147 static int BuildChromaResize( filter_t *p_filter )
149 filter_sys_t *p_sys = p_filter->p_sys;
153 /* Lets try resizing and then doing the chroma conversion */
154 msg_Dbg( p_filter, "Trying to build resize+chroma" );
155 EsFormatMergeSize( &fmt_mid, &p_filter->fmt_in, &p_filter->fmt_out );
156 i_ret = CreateChain( p_sys->p_chain, &fmt_mid );
157 es_format_Clean( &fmt_mid );
158 if( i_ret == VLC_SUCCESS )
161 /* Lets try it the other way arround (chroma and then resize) */
162 msg_Dbg( p_filter, "Trying to build chroma+resize" );
163 EsFormatMergeSize( &fmt_mid, &p_filter->fmt_out, &p_filter->fmt_in );
164 i_ret = CreateChain( p_sys->p_chain, &fmt_mid );
165 es_format_Clean( &fmt_mid );
166 if( i_ret == VLC_SUCCESS )
172 static int BuildChromaChain( filter_t *p_filter )
174 filter_sys_t *p_sys = p_filter->p_sys;
179 /* We have to protect ourself against a too high recursion */
180 const char *psz_option = MODULE_STRING"-level";
181 bool b_first = !var_Type( p_filter, psz_option );
183 if( var_Create( p_filter, MODULE_STRING"-level", VLC_VAR_INTEGER | (b_first ? VLC_VAR_DOINHERIT : 0 ) ) )
185 msg_Err( p_filter, "Failed to create %s variable", psz_option );
188 int i_level = var_GetInteger( p_filter, psz_option );
189 if( i_level >= CHAIN_LEVEL_MAX )
191 msg_Err( p_filter, "Too high level of recursion (%d)", i_level );
194 var_SetInteger( p_filter, psz_option, i_level + 1 );
196 /* Now try chroma format list */
197 for( i = 0; pi_allowed_chromas[i]; i++ )
199 const vlc_fourcc_t i_chroma = pi_allowed_chromas[i];
201 msg_Dbg( p_filter, "Trying to use chroma %4.4s as middle man",
204 es_format_Copy( &fmt_mid, &p_filter->fmt_in );
205 fmt_mid.video.i_chroma = i_chroma;
207 i_ret = CreateChain( p_sys->p_chain, &fmt_mid );
208 es_format_Clean( &fmt_mid );
210 if( i_ret == VLC_SUCCESS )
216 /*****************************************************************************
218 *****************************************************************************/
219 static picture_t *BufferNew( filter_t *p_filter )
221 filter_t *p_parent = (filter_t*)p_filter->p_owner;
223 return filter_NewPicture( p_parent );
225 static void BufferDel( filter_t *p_filter, picture_t *p_pic )
227 filter_t *p_parent = (filter_t*)p_filter->p_owner;
229 return filter_DeletePicture( p_parent, p_pic );
231 static int BufferAllocationInit ( filter_t *p_filter, void *p_data )
233 p_filter->pf_vout_buffer_new = BufferNew;
234 p_filter->pf_vout_buffer_del = BufferDel;
235 p_filter->p_owner = p_data;
239 /*****************************************************************************
241 *****************************************************************************/
242 static int CreateChain( filter_chain_t *p_chain, es_format_t *p_fmt_mid )
246 filter_chain_AppendFilter( p_chain, NULL, NULL, NULL, p_fmt_mid )) )
248 if( !filter_chain_AppendFilter( p_chain, NULL, NULL, p_fmt_mid, NULL ) )
250 filter_chain_DeleteFilter( p_chain, p_filter1 );
256 static void EsFormatMergeSize( es_format_t *p_dst,
257 const es_format_t *p_base,
258 const es_format_t *p_size )
260 es_format_Copy( p_dst, p_base );
262 p_dst->video.i_width = p_size->video.i_width;
263 p_dst->video.i_height = p_size->video.i_height;
265 p_dst->video.i_visible_width = p_size->video.i_visible_width;
266 p_dst->video.i_visible_height = p_size->video.i_visible_height;