1 /*****************************************************************************
2 * svg.c : Put SVG on the video
3 *****************************************************************************
4 * Copyright (C) 2002, 2003 the VideoLAN team
7 * Authors: Olivier Aubert <oaubert@lisi.univ-lyon1.fr>
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 *****************************************************************************/
27 #include <stdlib.h> /* malloc( ), free( ) */
31 #include <vlc_charset.h>
34 #include <vlc_block.h>
35 #include <vlc_filter.h>
37 #ifdef HAVE_SYS_TYPES_H
38 # include <sys/types.h>
43 #elif defined( WIN32 ) && !defined( UNDER_CE )
48 #include <glib/gstdio.h>
49 #include <glib-object.h> /* g_object_unref( ) */
50 #include <librsvg-2/librsvg/rsvg.h>
52 typedef struct svg_rendition_t svg_rendition_t;
54 /*****************************************************************************
56 *****************************************************************************/
57 static int Create ( vlc_object_t * );
58 static void Destroy ( vlc_object_t * );
59 static int RenderText( filter_t *p_filter, subpicture_region_t *p_region_out,
60 subpicture_region_t *p_region_in );
61 static char *svg_GetTemplate( vlc_object_t *p_this );
63 /*****************************************************************************
65 *****************************************************************************/
67 #define TEMPLATE_TEXT N_( "SVG template file" )
68 #define TEMPLATE_LONGTEXT N_( "Location of a file holding a SVG template "\
69 "for automatic string conversion" )
72 set_category( CAT_INPUT);
73 set_category( SUBCAT_INPUT_SCODEC );
74 set_capability( "text renderer", 99 );
75 add_shortcut( "svg" );
76 add_string( "svg-template-file", "", NULL, TEMPLATE_TEXT, TEMPLATE_LONGTEXT, VLC_TRUE );
77 set_callbacks( Create, Destroy );
81 Describes a SVG string to be displayed on the video
83 struct svg_rendition_t
88 /** The SVG source associated with this subpicture */
90 /* The rendered SVG, as a GdkPixbuf */
91 GdkPixbuf *p_rendition;
94 static int Render( filter_t *, subpicture_region_t *, svg_rendition_t *, int, int);
95 static char *svg_GetTemplate ();
96 static void svg_set_size( filter_t *p_filter, int width, int height );
97 static void svg_SizeCallback ( int *width, int *height, gpointer data );
98 static void svg_RenderPicture ( filter_t *p_filter,
99 svg_rendition_t *p_svg );
100 static void FreeString( svg_rendition_t * );
102 /*****************************************************************************
103 * filter_sys_t: svg local data
104 *****************************************************************************
105 * This structure is part of the filter thread descriptor.
106 * It describes the svg specific properties of an output thread.
107 *****************************************************************************/
110 /* The SVG template used to convert strings */
112 /* Default size for rendering. Initialized to the output size. */
118 /*****************************************************************************
119 * Create: allocates svg video thread output method
120 *****************************************************************************
121 * This function allocates and initializes a vout method.
122 *****************************************************************************/
123 static int Create( vlc_object_t *p_this )
125 filter_t *p_filter = ( filter_t * )p_this;
128 /* Allocate structure */
129 p_sys = malloc( sizeof( filter_sys_t ) );
132 msg_Err( p_filter, "out of memory" );
136 /* Initialize psz_template */
137 p_sys->psz_template = svg_GetTemplate( p_this );
138 if( !p_sys->psz_template )
140 msg_Err( p_filter, "out of memory" );
145 p_sys->i_width = p_filter->fmt_out.video.i_width;
146 p_sys->i_height = p_filter->fmt_out.video.i_height;
148 p_filter->pf_render_text = RenderText;
149 p_filter->pf_render_html = NULL;
150 p_filter->p_sys = p_sys;
152 /* MUST call this before any RSVG funcs */
158 static char *svg_GetTemplate( vlc_object_t *p_this )
160 filter_t *p_filter = ( filter_t * )p_this;
165 psz_filename = config_GetPsz( p_filter, "svg-template-file" );
166 if( !psz_filename || (psz_filename[0] == 0) )
168 /* No filename. Use a default value. */
173 /* Read the template */
174 file = utf8_fopen( psz_filename, "rt" );
177 msg_Warn( p_this, "SVG template file %s does not exist.",
186 i_ret = utf8_stat( psz_filename, &s );
189 /* Problem accessing file information. Should not
190 happen as we could open it. */
194 if( ((signed)s.st_size) < 0 )
196 msg_Err( p_this, "SVG template too big" );
201 msg_Dbg( p_this, "reading %ld bytes from template %s",
202 (unsigned long)s.st_size, psz_filename );
204 psz_template = malloc( ( s.st_size + 42 ) * sizeof( char ) );
207 msg_Err( p_filter, "out of memory" );
210 memset( psz_template, 0, s.st_size + 1 );
211 fread( psz_template, s.st_size, 1, file );
218 /* Either there was no file, or there was an error.
219 Use the default value */
220 psz_template = strdup( "<?xml version='1.0' encoding='UTF-8' standalone='no'?> \
221 <svg version='1' preserveAspectRatio='xMinYMin meet' viewBox='0 0 800 600'> \
222 <text x='10' y='560' fill='white' font-size='32' \
223 font-family='sans-serif'>%s</text></svg>" );
229 /*****************************************************************************
230 * Destroy: destroy Clone video thread output method
231 *****************************************************************************
232 * Clean up all data and library connections
233 *****************************************************************************/
234 static void Destroy( vlc_object_t *p_this )
236 filter_t *p_filter = ( filter_t * )p_this;
237 filter_sys_t *p_sys = p_filter->p_sys;
239 free( p_sys->psz_template );
244 /*****************************************************************************
245 * Render: render SVG in picture
246 *****************************************************************************/
247 static int Render( filter_t *p_filter, subpicture_region_t *p_region,
248 svg_rendition_t *p_svg, int i_width, int i_height )
251 uint8_t *p_y, *p_u, *p_v, *p_a;
252 int x, y, i_pitch, i_u_pitch;
253 guchar *pixels_in = NULL;
258 subpicture_region_t *p_region_tmp;
260 if ( p_filter->p_sys->i_width != i_width ||
261 p_filter->p_sys->i_height != i_height )
263 svg_set_size( p_filter, i_width, i_height );
264 p_svg->p_rendition = NULL;
267 if( p_svg->p_rendition == NULL ) {
268 svg_RenderPicture( p_filter, p_svg );
269 if( ! p_svg->p_rendition )
271 msg_Err( p_filter, "Cannot render SVG" );
275 i_width = gdk_pixbuf_get_width( p_svg->p_rendition );
276 i_height = gdk_pixbuf_get_height( p_svg->p_rendition );
278 /* Create a new subpicture region */
279 memset( &fmt, 0, sizeof( video_format_t ) );
280 fmt.i_chroma = VLC_FOURCC( 'Y','U','V','A' );
281 fmt.i_aspect = VOUT_ASPECT_FACTOR;
282 fmt.i_width = fmt.i_visible_width = i_width;
283 fmt.i_height = fmt.i_visible_height = i_height;
284 fmt.i_x_offset = fmt.i_y_offset = 0;
285 p_region_tmp = spu_CreateRegion( p_filter, &fmt );
288 msg_Err( p_filter, "cannot allocate SPU region" );
291 p_region->fmt = p_region_tmp->fmt;
292 p_region->picture = p_region_tmp->picture;
293 free( p_region_tmp );
295 p_region->i_x = p_region->i_y = 0;
296 p_y = p_region->picture.Y_PIXELS;
297 p_u = p_region->picture.U_PIXELS;
298 p_v = p_region->picture.V_PIXELS;
299 p_a = p_region->picture.A_PIXELS;
301 i_pitch = p_region->picture.Y_PITCH;
302 i_u_pitch = p_region->picture.U_PITCH;
304 /* Initialize the region pixels (only the alpha will be changed later) */
305 memset( p_y, 0x00, i_pitch * p_region->fmt.i_height );
306 memset( p_u, 0x80, i_u_pitch * p_region->fmt.i_height );
307 memset( p_v, 0x80, i_u_pitch * p_region->fmt.i_height );
309 p_pic = &p_region->picture;
313 /* This rendering code is in no way optimized. If someone has some time to
314 make it work faster or better, please do.
318 p_pixbuf->get_rowstride() is the number of bytes in a line.
319 p_pixbuf->get_height() is the number of lines.
321 The number of bytes of p_pixbuf->p_pixels is get_rowstride * get_height
324 alpha = pixels [ n_channels * ( y*rowstride + x ) + 3 ];
326 red = pixels [ n_channels * ( y*rowstride ) + x ) ];
327 green = pixels [ n_channels * ( y*rowstride ) + x ) + 1 ];
328 blue = pixels [ n_channels * ( y*rowstride ) + x ) + 2 ];
331 pixels_in = gdk_pixbuf_get_pixels( p_svg->p_rendition );
332 rowstride_in = gdk_pixbuf_get_rowstride( p_svg->p_rendition );
333 channels_in = gdk_pixbuf_get_n_channels( p_svg->p_rendition );
334 alpha = gdk_pixbuf_get_has_alpha( p_svg->p_rendition );
337 This crashes the plugin (if !alpha). As there is always an alpha value,
338 it does not matter for the moment :
341 memset( p_a, 0xFF, i_pitch * p_region->fmt.i_height );
344 #define INDEX_IN( x, y ) ( y * rowstride_in + x * channels_in )
345 #define INDEX_OUT( x, y ) ( y * i_pitch + x * p_pic->p[Y_PLANE].i_pixel_pitch )
347 for( y = 0; y < i_height; y++ )
349 for( x = 0; x < i_width; x++ )
354 p_in = &pixels_in[INDEX_IN( x, y )];
356 #define R( pixel ) *pixel
357 #define G( pixel ) *( pixel+1 )
358 #define B( pixel ) *( pixel+2 )
359 #define ALPHA( pixel ) *( pixel+3 )
361 /* From http://www.geocrawler.com/archives/3/8263/2001/6/0/6020594/ :
362 Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
363 U = -0.1687 * r - 0.3313 * g + 0.5 * b + 128
364 V = 0.5 * r - 0.4187 * g - 0.0813 * b + 128
367 i_out = INDEX_OUT( x, y );
369 p_pic->Y_PIXELS[i_out] = .299 * R( p_in ) + .587 * G( p_in ) + .114 * B( p_in );
371 p_pic->U_PIXELS[i_out] = -.1687 * R( p_in ) - .3313 * G( p_in ) + .5 * B( p_in ) + 128;
372 p_pic->V_PIXELS[i_out] = .5 * R( p_in ) - .4187 * G( p_in ) - .0813 * B( p_in ) + 128;
374 p_pic->A_PIXELS[i_out] = ALPHA( p_in );
382 static void svg_set_size( filter_t *p_filter, int width, int height )
384 p_filter->p_sys->i_width = width;
385 p_filter->p_sys->i_height = height;
388 static void svg_SizeCallback( int *width, int *height, gpointer data )
390 filter_t *p_filter = data;
392 *width = p_filter->p_sys->i_width;
393 *height = p_filter->p_sys->i_height;
397 static void svg_RenderPicture( filter_t *p_filter,
398 svg_rendition_t *p_svg )
400 /* Render the SVG string p_string->psz_text into a new picture_t
401 p_string->p_rendition with dimensions ( ->i_width, ->i_height ) */
402 RsvgHandle *p_handle;
403 GError *error = NULL;
405 p_svg->p_rendition = NULL;
407 p_handle = rsvg_handle_new();
411 msg_Err( p_filter, "Error creating SVG reader: %s", error->message );
415 rsvg_handle_set_size_callback( p_handle, svg_SizeCallback, p_filter, NULL );
417 if( ! rsvg_handle_write( p_handle,
418 ( guchar* )p_svg->psz_text, strlen( p_svg->psz_text ),
421 msg_Err( p_filter, "error while rendering SVG: %s\n", error->message );
422 g_object_unref( G_OBJECT( p_handle ) );
426 if( ! rsvg_handle_close( p_handle, &error ) )
428 msg_Err( p_filter, "error while rendering SVG (close): %s\n", error->message );
429 g_object_unref( G_OBJECT( p_handle ) );
433 p_svg->p_rendition = rsvg_handle_get_pixbuf( p_handle );
435 g_object_unref( G_OBJECT( p_handle ) );
439 static int RenderText( filter_t *p_filter, subpicture_region_t *p_region_out,
440 subpicture_region_t *p_region_in )
442 filter_sys_t *p_sys = p_filter->p_sys;
443 svg_rendition_t *p_svg = NULL;
447 if( !p_region_in || !p_region_out ) return VLC_EGENERIC;
448 psz_string = p_region_in->psz_text;
449 if( !psz_string || !*psz_string ) return VLC_EGENERIC;
451 p_svg = ( svg_rendition_t * )malloc( sizeof( svg_rendition_t ) );
454 msg_Err( p_filter, "out of memory" );
458 p_region_out->i_x = p_region_in->i_x;
459 p_region_out->i_y = p_region_in->i_y;
461 /* Check if the data is SVG or pure text. In the latter case,
462 convert the text to SVG. FIXME: find a better test */
463 if( strstr( psz_string, "<svg" ))
465 /* Data is SVG: duplicate */
466 p_svg->psz_text = strdup( psz_string );
467 if( !p_svg->psz_text )
469 msg_Err( p_filter, "out of memory" );
476 /* Data is text. Convert to SVG */
477 /* FIXME: handle p_style attributes */
479 char* psz_template = p_sys->psz_template;
480 length = strlen( psz_string ) + strlen( psz_template ) + 42;
481 p_svg->psz_text = malloc( ( length + 1 ) * sizeof( char ) );
482 if( !p_svg->psz_text )
484 msg_Err( p_filter, "out of memory" );
488 memset( p_svg->psz_text, 0, length + 1 );
489 snprintf( p_svg->psz_text, length, psz_template, psz_string );
491 p_svg->i_width = p_sys->i_width;
492 p_svg->i_height = p_sys->i_height;
493 p_svg->i_chroma = VLC_FOURCC( 'Y','U','V','A' );
496 The input data is stored in the p_string structure,
497 and the function updates the p_rendition attribute. */
498 svg_RenderPicture( p_filter, p_svg );
500 Render( p_filter, p_region_out, p_svg, p_svg->i_width, p_svg->i_height );
506 static void FreeString( svg_rendition_t *p_svg )
508 if( p_svg->psz_text )
509 free( p_svg->psz_text );
510 /* p_svg->p_rendition is a GdkPixbuf, and its allocation is
511 managed through ref. counting */
512 if( p_svg->p_rendition )
513 g_object_unref( p_svg->p_rendition );