1 /*****************************************************************************
2 * dynamicoverlay.c : dynamic overlay plugin for vlc
3 *****************************************************************************
4 * Copyright (C) 2007 the VideoLAN team
7 * Author: Søren Bøg <avacore@videolan.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 *****************************************************************************/
31 #include <vlc_common.h>
32 #include <vlc_plugin.h>
35 #include <vlc_filter.h>
42 #include "dynamicoverlay.h"
44 /*****************************************************************************
46 *****************************************************************************/
47 static int Create( vlc_object_t * );
48 static void Destroy( vlc_object_t * );
49 static subpicture_t *Filter( filter_t *, mtime_t );
51 static int AdjustCallback( vlc_object_t *p_this, char const *psz_var,
52 vlc_value_t oldval, vlc_value_t newval,
55 /*****************************************************************************
57 *****************************************************************************/
59 #define INPUT_TEXT N_("Input FIFO")
60 #define INPUT_LONGTEXT N_("FIFO which will be read for commands")
62 #define OUTPUT_TEXT N_("Output FIFO")
63 #define OUTPUT_LONGTEXT N_("FIFO which will be written to for responses")
66 set_description( N_("Dynamic video overlay") )
67 set_shortname( N_("Overlay" ))
68 set_category( CAT_VIDEO )
69 set_subcategory( SUBCAT_VIDEO_VFILTER )
70 set_capability( "sub filter", 0 )
72 add_file( "overlay-input", NULL, NULL, INPUT_TEXT, INPUT_LONGTEXT,
74 add_file( "overlay-output", NULL, NULL, OUTPUT_TEXT, OUTPUT_LONGTEXT,
77 add_shortcut( "overlay" )
78 set_callbacks( Create, Destroy )
81 static const char *const ppsz_filter_options[] = {
82 "input", "output", NULL
85 /*****************************************************************************
86 * Create: allocates adjust video thread output method
87 *****************************************************************************
88 * This function allocates and initializes a adjust vout method.
89 *****************************************************************************/
90 static int Create( vlc_object_t *p_this )
92 filter_t *p_filter = (filter_t *)p_this;
95 /* Allocate structure */
96 p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
97 if( p_filter->p_sys == NULL )
99 p_sys = p_filter->p_sys;
101 BufferInit( &p_sys->input );
102 BufferInit( &p_sys->output );
103 QueueInit( &p_sys->atomic );
104 QueueInit( &p_sys->pending );
105 QueueInit( &p_sys->processed );
106 ListInit( &p_sys->overlays );
108 p_sys->i_inputfd = -1;
109 p_sys->i_outputfd = -1;
110 p_sys->b_updated = true;
111 p_sys->b_atomic = false;
112 vlc_mutex_init( &p_sys->lock );
114 p_filter->pf_sub_filter = Filter;
116 config_ChainParse( p_filter, "overlay-", ppsz_filter_options,
119 p_sys->psz_inputfile = var_CreateGetStringCommand( p_filter,
121 p_sys->psz_outputfile = var_CreateGetStringCommand( p_filter,
124 var_AddCallback( p_filter, "overlay-input", AdjustCallback, p_sys );
125 var_AddCallback( p_filter, "overlay-output", AdjustCallback, p_sys );
127 RegisterCommand( p_filter );
131 /*****************************************************************************
132 * Destroy: destroy adjust video thread output method
133 *****************************************************************************
134 * Terminate an output method created by adjustCreateOutputMethod
135 *****************************************************************************/
136 static void Destroy( vlc_object_t *p_this )
138 filter_t *p_filter = (filter_t *)p_this;
139 filter_sys_t *p_sys = p_filter->p_sys;
141 BufferDestroy( &p_sys->input );
142 BufferDestroy( &p_sys->output );
143 QueueDestroy( &p_sys->atomic );
144 QueueDestroy( &p_sys->pending );
145 QueueDestroy( &p_sys->processed );
146 ListDestroy( &p_sys->overlays );
147 UnregisterCommand( p_filter );
149 var_DelCallback( p_filter, "overlay-input", AdjustCallback, p_sys );
150 var_DelCallback( p_filter, "overlay-output", AdjustCallback, p_sys );
152 vlc_mutex_destroy( &p_sys->lock );
153 free( p_sys->psz_inputfile );
154 free( p_sys->psz_outputfile );
158 /*****************************************************************************
159 * Render: displays previously rendered output
160 *****************************************************************************
161 * This function send the currently rendered image to adjust modified image,
162 * waits until it is displayed and switch the two rendering buffers, preparing
164 *****************************************************************************/
165 static subpicture_t *Filter( filter_t *p_filter, mtime_t date )
167 filter_sys_t *p_sys = p_filter->p_sys;
169 /* We might need to open these at any time. */
170 vlc_mutex_lock( &p_sys->lock );
171 if( p_sys->i_inputfd == -1 )
173 p_sys->i_inputfd = open( p_sys->psz_inputfile, O_RDONLY | O_NONBLOCK );
174 if( p_sys->i_inputfd == -1 )
176 msg_Warn( p_filter, "Failed to grab input file: %s (%s)",
177 p_sys->psz_inputfile, strerror( errno ) );
181 msg_Info( p_filter, "Grabbed input file: %s",
182 p_sys->psz_inputfile );
186 if( p_sys->i_outputfd == -1 )
188 p_sys->i_outputfd = open( p_sys->psz_outputfile,
189 O_WRONLY | O_NONBLOCK );
190 if( p_sys->i_outputfd == -1 )
194 msg_Warn( p_filter, "Failed to grab output file: %s (%s)",
195 p_sys->psz_outputfile, strerror( errno ) );
200 msg_Info( p_filter, "Grabbed output file: %s",
201 p_sys->psz_outputfile );
204 vlc_mutex_unlock( &p_sys->lock );
206 /* Read any waiting commands */
207 if( p_sys->i_inputfd != -1 )
210 ssize_t i_len = read( p_sys->i_inputfd, p_buffer, 1024 );
213 /* We hit an error */
214 if( errno != EAGAIN )
216 msg_Warn( p_filter, "Error on input file: %s",
218 close( p_sys->i_inputfd );
219 p_sys->i_inputfd = -1;
222 else if( i_len == 0 )
224 /* We hit the end-of-file */
228 BufferAdd( &p_sys->input, p_buffer, i_len );
232 /* Parse any complete commands */
234 while( ( p_end = memchr( p_sys->input.p_begin, '\n',
235 p_sys->input.i_length ) ) )
237 commanddesc_t *p_cur = NULL;
238 bool b_found = false;
242 p_cmd = BufferGetToken( &p_sys->input );
244 msg_Info( p_filter, "Search command: %s", p_cmd );
245 for( i_index = 0; i_index < p_sys->i_commands; i_index++ )
247 p_cur = p_sys->pp_commands[i_index];
248 if( !strncmp( p_cur->psz_command, p_cmd, strlen(p_cur->psz_command) ) )
250 p_cmd[strlen(p_cur->psz_command)] = '\0';
258 /* No matching command */
259 msg_Err( p_filter, "Got invalid command: %s", p_cmd );
260 BufferPrintf( &p_sys->output, "FAILURE: %d Invalid Command\n", VLC_EGENERIC );
264 msg_Info( p_filter, "Got valid command: %s", p_cmd );
266 command_t *p_cmddesc = malloc( sizeof( command_t ) );
270 p_cmd = p_cmd + strlen(p_cur->psz_command) +1;
271 p_cmddesc->p_command = p_cur;
272 p_cmddesc->p_command->pf_parser( p_cmd, p_end,
273 &p_cmddesc->params );
275 if( ( p_cmddesc->p_command->b_atomic == true ) &&
276 ( p_sys->b_atomic == true ) )
277 QueueEnqueue( &p_sys->atomic, p_cmddesc );
279 QueueEnqueue( &p_sys->pending, p_cmddesc );
282 BufferDel( &p_sys->input, p_end - p_sys->input.p_begin + 1 );
285 /* Process any pending commands */
286 command_t *p_command = NULL;
287 while( (p_command = QueueDequeue( &p_sys->pending )) )
289 p_command->i_status =
290 p_command->p_command->pf_execute( p_filter, &p_command->params,
291 &p_command->results );
292 QueueEnqueue( &p_sys->processed, p_command );
295 /* Output any processed commands */
296 while( (p_command = QueueDequeue( &p_sys->processed )) )
298 if( p_command->i_status == VLC_SUCCESS )
300 const char *psz_success = "SUCCESS:";
301 const char *psz_nl = "\n";
302 BufferAdd( &p_sys->output, psz_success, 8 );
303 p_command->p_command->pf_unparse( &p_command->results,
305 BufferAdd( &p_sys->output, psz_nl, 1 );
309 BufferPrintf( &p_sys->output, "FAILURE: %d\n",
310 p_command->i_status );
314 /* Try emptying the output buffer */
315 if( p_sys->i_outputfd != -1 )
317 ssize_t i_len = write( p_sys->i_outputfd, p_sys->output.p_begin,
318 p_sys->output.i_length );
321 /* We hit an error */
322 if( errno != EAGAIN )
324 msg_Warn( p_filter, "Error on output file: %s",
326 close( p_sys->i_outputfd );
327 p_sys->i_outputfd = -1;
332 BufferDel( &p_sys->output, i_len );
336 if( p_sys->b_updated == false )
339 subpicture_t *p_spu = NULL;
340 overlay_t *p_overlay = NULL;
342 p_spu = p_filter->pf_sub_buffer_new( p_filter );
345 msg_Err( p_filter, "cannot allocate subpicture" );
349 p_spu->b_absolute = true;
350 p_spu->i_start = date;
352 p_spu->b_ephemer = true;
354 subpicture_region_t **pp_region = &p_spu->p_region;
355 while( (p_overlay = ListWalk( &p_sys->overlays )) )
357 subpicture_region_t *p_region;
359 *pp_region = p_region = subpicture_region_New( &p_overlay->format );
363 msg_Dbg( p_filter, "Displaying overlay: %4.4s, %d, %d, %d",
364 (char*)&p_overlay->format.i_chroma, p_overlay->i_x, p_overlay->i_y,
365 p_overlay->i_alpha );
367 if( p_overlay->format.i_chroma == VLC_CODEC_TEXT )
369 p_region->psz_text = strdup( p_overlay->data.p_text );
370 p_region->p_style = text_style_Duplicate( p_overlay->p_fontstyle );
374 /* FIXME the copy is probably not needed anymore */
375 picture_Copy( p_region->p_picture, p_overlay->data.p_pic );
377 p_region->i_x = p_overlay->i_x;
378 p_region->i_y = p_overlay->i_y;
379 p_region->i_align = OSD_ALIGN_LEFT | OSD_ALIGN_TOP;
380 p_region->i_alpha = p_overlay->i_alpha;
381 pp_region = &p_region->p_next;
384 p_sys->b_updated = false;
388 static int AdjustCallback( vlc_object_t *p_this, char const *psz_var,
389 vlc_value_t oldval, vlc_value_t newval,
392 filter_sys_t *p_sys = (filter_sys_t *)p_data;
393 VLC_UNUSED(p_this); VLC_UNUSED(oldval);
395 vlc_mutex_lock( &p_sys->lock );
396 if( !strncmp( psz_var, "overlay-input", 13 ) )
398 free( p_sys->psz_inputfile );
399 p_sys->psz_inputfile = strdup( newval.psz_string );
401 else if( !strncmp( psz_var, "overlay-output", 14 ) )
403 free( p_sys->psz_outputfile );
404 p_sys->psz_outputfile = strdup( newval.psz_string );
406 vlc_mutex_unlock( &p_sys->lock );