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( ) */
30 #ifdef HAVE_SYS_TYPES_H
31 # include <sys/types.h>
33 #ifdef HAVE_SYS_STAT_H
34 # include <sys/stat.h>
38 #elif defined( WIN32 ) && !defined( UNDER_CE )
45 #include "vlc_block.h"
46 #include "vlc_filter.h"
48 #include <librsvg-2/librsvg/rsvg.h>
50 typedef struct svg_rendition_t svg_rendition_t;
52 /*****************************************************************************
54 *****************************************************************************/
55 static int Create ( vlc_object_t * );
56 static void Destroy ( vlc_object_t * );
57 static int RenderText( filter_t *p_filter, subpicture_region_t *p_region_out,
58 subpicture_region_t *p_region_in );
61 /*****************************************************************************
63 *****************************************************************************/
65 #define TEMPLATE_TEXT N_( "SVG template file" )
66 #define TEMPLATE_LONGTEXT N_( "Location of a file holding a SVG template for automatic string conversion" )
69 set_category( CAT_INPUT);
70 set_category( SUBCAT_INPUT_SCODEC );
71 set_capability( "text renderer", 101 );
72 add_shortcut( "svg" );
73 add_string( "svg-template-file", "", NULL, TEMPLATE_TEXT, TEMPLATE_LONGTEXT, VLC_TRUE );
74 set_callbacks( Create, Destroy );
78 Describes a SVG string to be displayed on the video
80 struct svg_rendition_t
85 /** The SVG source associated with this subpicture */
87 /* The rendered SVG, as a GdkPixbuf */
88 GdkPixbuf *p_rendition;
91 static int Render( filter_t *, subpicture_region_t *, svg_rendition_t *, int, int);
92 static byte_t *svg_GetTemplate ();
93 static void svg_set_size( filter_t *p_filter, int width, int height );
94 static void svg_SizeCallback ( int *width, int *height, gpointer data );
95 static void svg_RenderPicture ( filter_t *p_filter,
96 svg_rendition_t *p_svg );
97 static void FreeString( svg_rendition_t * );
99 /*****************************************************************************
100 * filter_sys_t: svg local data
101 *****************************************************************************
102 * This structure is part of the filter thread descriptor.
103 * It describes the svg specific properties of an output thread.
104 *****************************************************************************/
107 /* The SVG template used to convert strings */
108 byte_t *psz_template;
109 /* Default size for rendering. Initialized to the output size. */
115 /*****************************************************************************
116 * Create: allocates svg video thread output method
117 *****************************************************************************
118 * This function allocates and initializes a vout method.
119 *****************************************************************************/
120 static int Create( vlc_object_t *p_this )
122 filter_t *p_filter = ( filter_t * )p_this;
125 /* Allocate structure */
126 p_sys = malloc( sizeof( filter_sys_t ) );
129 msg_Err( p_filter, "Out of memory" );
133 /* Initialize psz_template */
134 p_sys->psz_template = svg_GetTemplate( p_this );
135 if( !p_sys->psz_template )
137 msg_Err( p_filter, "Out of memory" );
141 p_sys->i_width = p_filter->fmt_out.video.i_width;
142 p_sys->i_height = p_filter->fmt_out.video.i_height;
144 p_filter->pf_render_text = RenderText;
145 p_filter->p_sys = p_sys;
147 /* MUST call this before any RSVG funcs */
153 static byte_t *svg_GetTemplate( vlc_object_t *p_this )
155 filter_t *p_filter = ( filter_t * )p_this;
160 psz_filename = config_GetPsz( p_filter, "svg-template-file" );
161 if( !psz_filename || psz_filename[0] == 0 )
163 /* No filename. Use a default value. */
168 /* Read the template */
169 file = fopen( psz_filename, "rt" );
172 msg_Warn( p_this, "SVG template file %s does not exist.", psz_filename );
180 i_ret = lstat( psz_filename, &s );
183 /* Problem accessing file information. Should not
184 happen as we could open it. */
189 msg_Dbg( p_this, "Reading %ld bytes from template %s\n", ( long )s.st_size, psz_filename );
191 psz_template = malloc( s.st_size + 42 );
194 msg_Err( p_filter, "Out of memory" );
197 memset( psz_template, 0, s.st_size + 1 );
198 fread( psz_template, s.st_size, 1, file );
205 /* Either there was no file, or there was an error.
206 Use the default value */
207 psz_template = strdup( "<?xml version='1.0' encoding='UTF-8' standalone='no'?> \
208 <svg version='1' preserveAspectRatio='xMinYMin meet' viewBox='0 0 800 600'> \
209 <text x='10' y='560' fill='white' font-size='32' \
210 font-family='sans-serif'>%s</text></svg>" );
216 /*****************************************************************************
217 * Destroy: destroy Clone video thread output method
218 *****************************************************************************
219 * Clean up all data and library connections
220 *****************************************************************************/
221 static void Destroy( vlc_object_t *p_this )
223 filter_t *p_filter = ( filter_t * )p_this;
224 filter_sys_t *p_sys = p_filter->p_sys;
226 free( p_sys->psz_template );
230 /*****************************************************************************
231 * Render: render SVG in picture
232 *****************************************************************************/
233 static int Render( filter_t *p_filter, subpicture_region_t *p_region,
234 svg_rendition_t *p_svg, int i_width, int i_height )
237 uint8_t *p_y, *p_u, *p_v, *p_a;
238 int x, y, i_pitch, i_u_pitch;
239 guchar *pixels_in = NULL;
244 subpicture_region_t *p_region_tmp;
246 if ( p_filter->p_sys->i_width != i_width ||
247 p_filter->p_sys->i_height != i_height )
249 svg_set_size( p_filter, i_width, i_height );
250 p_svg->p_rendition = NULL;
253 if( p_svg->p_rendition == NULL ) {
254 svg_RenderPicture( p_filter, p_svg );
255 /* FIXME: should do a check here to ensure that
256 the rendition went OK */
258 i_width = gdk_pixbuf_get_width( p_svg->p_rendition );
259 i_height = gdk_pixbuf_get_height( p_svg->p_rendition );
261 /* Create a new subpicture region */
262 memset( &fmt, 0, sizeof( video_format_t ) );
263 fmt.i_chroma = VLC_FOURCC( 'Y','U','V','A' );
264 fmt.i_aspect = VOUT_ASPECT_FACTOR;
265 fmt.i_width = fmt.i_visible_width = i_width;
266 fmt.i_height = fmt.i_visible_height = i_height;
267 fmt.i_x_offset = fmt.i_y_offset = 0;
268 p_region_tmp = spu_CreateRegion( p_filter, &fmt );
271 msg_Err( p_filter, "cannot allocate SPU region" );
274 p_region->fmt = p_region_tmp->fmt;
275 p_region->picture = p_region_tmp->picture;
276 free( p_region_tmp );
278 p_region->i_x = p_region->i_y = 0;
279 p_y = p_region->picture.Y_PIXELS;
280 p_u = p_region->picture.U_PIXELS;
281 p_v = p_region->picture.V_PIXELS;
282 p_a = p_region->picture.A_PIXELS;
284 i_pitch = p_region->picture.Y_PITCH;
285 i_u_pitch = p_region->picture.U_PITCH;
287 /* Initialize the region pixels (only the alpha will be changed later) */
288 memset( p_y, 0x00, i_pitch * p_region->fmt.i_height );
289 memset( p_u, 0x80, i_u_pitch * p_region->fmt.i_height );
290 memset( p_v, 0x80, i_u_pitch * p_region->fmt.i_height );
292 p_pic = &p_region->picture;
296 /* This rendering code is in no way optimized. If someone has some time to
297 make it work faster or better, please do.
301 p_pixbuf->get_rowstride() is the number of bytes in a line.
302 p_pixbuf->get_height() is the number of lines.
304 The number of bytes of p_pixbuf->p_pixels is get_rowstride * get_height
307 alpha = pixels [ n_channels * ( y*rowstride + x ) + 3 ];
309 red = pixels [ n_channels * ( y*rowstride ) + x ) ];
310 green = pixels [ n_channels * ( y*rowstride ) + x ) + 1 ];
311 blue = pixels [ n_channels * ( y*rowstride ) + x ) + 2 ];
314 pixels_in = gdk_pixbuf_get_pixels( p_svg->p_rendition );
315 rowstride_in = gdk_pixbuf_get_rowstride( p_svg->p_rendition );
316 channels_in = gdk_pixbuf_get_n_channels( p_svg->p_rendition );
317 alpha = gdk_pixbuf_get_has_alpha( p_svg->p_rendition );
320 This crashes the plugin (if !alpha). As there is always an alpha value,
321 it does not matter for the moment :
324 memset( p_a, 0xFF, i_pitch * p_region->fmt.i_height );
327 #define INDEX_IN( x, y ) ( y * rowstride_in + x * channels_in )
328 #define INDEX_OUT( x, y ) ( y * i_pitch + x * p_pic->p[Y_PLANE].i_pixel_pitch )
330 for( y = 0; y < i_height; y++ )
332 for( x = 0; x < i_width; x++ )
337 p_in = &pixels_in[INDEX_IN( x, y )];
339 #define R( pixel ) *pixel
340 #define G( pixel ) *( pixel+1 )
341 #define B( pixel ) *( pixel+2 )
342 #define ALPHA( pixel ) *( pixel+3 )
344 /* From http://www.geocrawler.com/archives/3/8263/2001/6/0/6020594/ :
345 Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
346 U = -0.1687 * r - 0.3313 * g + 0.5 * b + 128
347 V = 0.5 * r - 0.4187 * g - 0.0813 * b + 128
350 i_out = INDEX_OUT( x, y );
352 p_pic->Y_PIXELS[i_out] = .299 * R( p_in ) + .587 * G( p_in ) + .114 * B( p_in );
354 p_pic->U_PIXELS[i_out] = -.1687 * R( p_in ) - .3313 * G( p_in ) + .5 * B( p_in ) + 128;
355 p_pic->V_PIXELS[i_out] = .5 * R( p_in ) - .4187 * G( p_in ) - .0813 * B( p_in ) + 128;
357 p_pic->A_PIXELS[i_out] = ALPHA( p_in );
365 static void svg_set_size( filter_t *p_filter, int width, int height )
367 p_filter->p_sys->i_width = width;
368 p_filter->p_sys->i_height = height;
371 static void svg_SizeCallback( int *width, int *height, gpointer data )
373 filter_t *p_filter = data;
375 *width = p_filter->p_sys->i_width;
376 *height = p_filter->p_sys->i_height;
380 static void svg_RenderPicture( filter_t *p_filter,
381 svg_rendition_t *p_svg )
383 /* Render the SVG string p_string->psz_text into a new picture_t
384 p_string->p_rendition with dimensions ( ->i_width, ->i_height ) */
385 RsvgHandle *p_handle;
386 GError *error = NULL;
388 p_handle = rsvg_handle_new();
390 rsvg_handle_set_size_callback( p_handle, svg_SizeCallback, p_filter, NULL );
392 rsvg_handle_write( p_handle,
393 p_svg->psz_text, strlen( p_svg->psz_text ) + 1,
397 msg_Err( p_filter, "Error in handle_write: %s\n", error->message );
400 rsvg_handle_close( p_handle, &error );
402 p_svg->p_rendition = rsvg_handle_get_pixbuf( p_handle );
403 rsvg_handle_free( p_handle );
407 static int RenderText( filter_t *p_filter, subpicture_region_t *p_region_out,
408 subpicture_region_t *p_region_in )
410 filter_sys_t *p_sys = p_filter->p_sys;
411 svg_rendition_t *p_svg = NULL;
415 if( !p_region_in || !p_region_out ) return VLC_EGENERIC;
416 psz_string = p_region_in->psz_text;
417 if( !psz_string || !*psz_string ) return VLC_EGENERIC;
419 p_svg = ( svg_rendition_t * )malloc( sizeof( svg_rendition_t ) );
422 msg_Err( p_filter, "Out of memory" );
426 p_region_out->i_x = p_region_in->i_x;
427 p_region_out->i_y = p_region_in->i_y;
429 /* Check if the data is SVG or pure text. In the latter case,
430 convert the text to SVG. FIXME: find a better test */
431 if( strstr( psz_string, "<svg" ))
433 /* Data is SVG: duplicate */
434 p_svg->psz_text = strdup( psz_string );
435 if( !p_svg->psz_text )
437 msg_Err( p_filter, "Out of memory" );
444 /* Data is text. Convert to SVG */
446 byte_t* psz_template = p_sys->psz_template;
447 length = strlen( psz_string ) + strlen( psz_template ) + 42;
448 p_svg->psz_text = malloc( length + 1 );
449 if( !p_svg->psz_text )
451 msg_Err( p_filter, "Out of memory" );
455 memset( p_svg->psz_text, 0, length + 1 );
456 snprintf( p_svg->psz_text, length, psz_template, psz_string );
458 p_svg->i_width = p_sys->i_width;
459 p_svg->i_height = p_sys->i_height;
460 p_svg->i_chroma = VLC_FOURCC( 'Y','U','V','A' );
463 The input data is stored in the p_string structure,
464 and the function updates the p_rendition attribute. */
465 svg_RenderPicture( p_filter, p_svg );
467 Render( p_filter, p_region_out, p_svg, p_svg->i_width, p_svg->i_height );
473 static void FreeString( svg_rendition_t *p_svg )
475 free( p_svg->psz_text );
476 free( p_svg->p_rendition );