git.sesse.net Git - vlc/blob - modules/video_filter/audiobargraph_v.c

   1 /*****************************************************************************
   2  * audiobargraph_v.c : audiobargraph video plugin for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2003-2006 VLC authors and VideoLAN
   5  *
   6  * Authors: Clement CHESNIN <clement.chesnin@gmail.com>
   7  *          Philippe COENT <philippe.coent@tdf.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU Lesser General Public License as published by
  11  * the Free Software Foundation; either version 2.1 of the License, or
  12  * (at your option) any later version.
  13  *
  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 Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public License
  20  * along with this program; if not, write to the Free Software Foundation,
  21  * Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31 #include <string.h>
  32 #include <math.h>
  33
  34 #include <vlc_common.h>
  35 #include <vlc_plugin.h>
  36 #include <vlc_filter.h>
  37
  38 #include <vlc_image.h>
  39
  40 #ifdef LoadImage
  41 #   undef LoadImage
  42 #endif
  43
  44 /*****************************************************************************
  45  * Module descriptor
  46  *****************************************************************************/
  47
  48 #define I_VALUES_TEXT N_("Value of the audio channels levels")
  49 #define I_VALUES_LONGTEXT N_("Value of the audio level of each channels between 0 and 1. " \
  50     "Each level should be separated with ':'.")
  51 #define POSX_TEXT N_("X coordinate")
  52 #define POSX_LONGTEXT N_("X coordinate of the bargraph." )
  53 #define POSY_TEXT N_("Y coordinate")
  54 #define POSY_LONGTEXT N_("Y coordinate of the bargraph." )
  55 #define TRANS_TEXT N_("Transparency of the bargraph")
  56 #define TRANS_LONGTEXT N_("Bargraph transparency value " \
  57   "(from 0 for full transparency to 255 for full opacity)." )
  58 #define POS_TEXT N_("Bargraph position")
  59 #define POS_LONGTEXT N_( \
  60   "Enforce the bargraph position on the video " \
  61   "(0=center, 1=left, 2=right, 4=top, 8=bottom, you can " \
  62   "also use combinations of these values, eg 6 = top-right).")
  63 #define ALARM_TEXT N_("Alarm")
  64 #define ALARM_LONGTEXT N_("Signals a silence and displays and alert " \
  65                 "(0=no alarm, 1=alarm).")
  66 #define BARWIDTH_TEXT N_("Bar width in pixel (default : 10)")
  67 #define BARWIDTH_LONGTEXT N_("Width in pixel of each bar in the BarGraph to be displayed " \
  68                 "(default : 10).")
  69
  70 #define CFG_PREFIX "audiobargraph_v-"
  71
  72 static const int pi_pos_values[] = { 0, 1, 2, 4, 8, 5, 6, 9, 10 };
  73 static const char *const ppsz_pos_descriptions[] =
  74 { N_("Center"), N_("Left"), N_("Right"), N_("Top"), N_("Bottom"),
  75   N_("Top-Left"), N_("Top-Right"), N_("Bottom-Left"), N_("Bottom-Right") };
  76
  77 static int  OpenSub  ( vlc_object_t * );
  78 static int  OpenVideo( vlc_object_t * );
  79 static void Close    ( vlc_object_t * );
  80
  81 vlc_module_begin ()
  82
  83     set_category( CAT_VIDEO )
  84     set_subcategory( SUBCAT_VIDEO_SUBPIC )
  85
  86     set_capability( "sub source", 0 )
  87     set_callbacks( OpenSub, Close )
  88     set_description( N_("Audio Bar Graph Video sub source") )
  89     set_shortname( N_("Audio Bar Graph Video") )
  90     add_shortcut( "audiobargraph_v" )
  91
  92     add_string( CFG_PREFIX "i_values", NULL, I_VALUES_TEXT, I_VALUES_LONGTEXT, false )
  93     add_integer( CFG_PREFIX "x", 0, POSX_TEXT, POSX_LONGTEXT, true )
  94     add_integer( CFG_PREFIX "y", 0, POSY_TEXT, POSY_LONGTEXT, true )
  95     add_integer_with_range( CFG_PREFIX "transparency", 255, 0, 255,
  96         TRANS_TEXT, TRANS_LONGTEXT, false )
  97     add_integer( CFG_PREFIX "position", -1, POS_TEXT, POS_LONGTEXT, false )
  98         change_integer_list( pi_pos_values, ppsz_pos_descriptions )
  99     add_integer( CFG_PREFIX "alarm", 0, ALARM_TEXT, ALARM_LONGTEXT, true )
 100     add_integer( CFG_PREFIX "barWidth", 10, BARWIDTH_TEXT, BARWIDTH_LONGTEXT, true )
 101
 102     /* video output filter submodule */
 103     add_submodule ()
 104     set_capability( "video filter2", 0 )
 105     set_callbacks( OpenVideo, Close )
 106     set_description( N_("Audio Bar Graph Video sub source") )
 107     add_shortcut( "audiobargraph_v" )
 108 vlc_module_end ()
 109
 110
 111 /*****************************************************************************
 112  * Local prototypes
 113  *****************************************************************************/
 114
 115 /*****************************************************************************
 116  * Structure to hold the Bar Graph properties
 117  ****************************************************************************/
 118 typedef struct
 119 {
 120     int i_alpha;       /* -1 means use default alpha */
 121     int nbChannels;
 122     int *i_values;
 123     picture_t *p_pic;
 124     mtime_t date;
 125     int scale;
 126     int alarm;
 127     int barWidth;
 128
 129 } BarGraph_t;
 130
 131 /**
 132  * Private data holder
 133  */
 134 struct filter_sys_t
 135 {
 136     filter_t *p_blend;
 137
 138     vlc_mutex_t lock;
 139
 140     BarGraph_t p_BarGraph;
 141
 142     int i_pos;
 143     int i_pos_x;
 144     int i_pos_y;
 145     bool b_absolute;
 146
 147     /* On the fly control variable */
 148     bool b_spu_update;
 149 };
 150
 151 static const char *const ppsz_filter_options[] = {
 152     "i_values", "x", "y", "transparency", "position", "alarm", "barWidth", NULL
 153 };
 154
 155 static const char *const ppsz_filter_callbacks[] = {
 156     "audiobargraph_v-i_values",
 157     "audiobargraph_v-x",
 158     "audiobargraph_v-y",
 159     "audiobargraph_v-transparency",
 160     "audiobargraph_v-position",
 161     "audiobargraph_v-alarm",
 162     "audiobargraph_v-barWidth",
 163     NULL
 164 };
 165
 166 static int OpenCommon( vlc_object_t *, bool b_sub );
 167
 168 static subpicture_t *FilterSub( filter_t *, mtime_t );
 169 static picture_t    *FilterVideo( filter_t *, picture_t * );
 170
 171 static int BarGraphCallback( vlc_object_t *, char const *,
 172                          vlc_value_t, vlc_value_t, void * );
 173
 174 static void LoadBarGraph( vlc_object_t *, BarGraph_t *);
 175 void parse_i_values( BarGraph_t *p_BarGraph, char *i_values);
 176 static float iec_scale(float dB);
 177
 178 /**
 179  * Open the sub source
 180  */
 181 static int OpenSub( vlc_object_t *p_this )
 182 {
 183     return OpenCommon( p_this, true );
 184 }
 185
 186 /**
 187  * Open the video filter
 188  */
 189 static int OpenVideo( vlc_object_t *p_this )
 190 {
 191     return OpenCommon( p_this, false );
 192 }
 193
 194 /**
 195  * Common open function
 196  */
 197 static int OpenCommon( vlc_object_t *p_this, bool b_sub )
 198 {
 199     filter_t *p_filter = (filter_t *)p_this;
 200     filter_sys_t *p_sys;
 201     BarGraph_t *p_BarGraph;
 202     char* i_values = NULL;
 203
 204     /* */
 205     if( !b_sub && !es_format_IsSimilar( &p_filter->fmt_in, &p_filter->fmt_out ) )
 206     {
 207         msg_Err( p_filter, "Input and output format does not match" );
 208         return VLC_EGENERIC;
 209     }
 210
 211
 212     /* */
 213     p_filter->p_sys = p_sys = malloc( sizeof( *p_sys ) );
 214     if( !p_sys )
 215         return VLC_ENOMEM;
 216     p_BarGraph = &(p_sys->p_BarGraph);
 217
 218     /* */
 219     p_sys->p_blend = NULL;
 220     if( !b_sub )
 221     {
 222
 223         p_sys->p_blend = filter_NewBlend( VLC_OBJECT(p_filter),
 224                                           &p_filter->fmt_in.video );
 225         if( !p_sys->p_blend )
 226         {
 227             //free( p_BarGraph );
 228             free( p_sys );
 229             return VLC_EGENERIC;
 230         }
 231     }
 232
 233     /* */
 234     config_ChainParse( p_filter, CFG_PREFIX, ppsz_filter_options,
 235                        p_filter->p_cfg );
 236
 237     /* create and initialize variables */
 238     p_sys->i_pos = var_CreateGetIntegerCommand( p_filter, "audiobargraph_v-position" );
 239     p_sys->i_pos_x = var_CreateGetIntegerCommand( p_filter, "audiobargraph_v-x" );
 240     p_sys->i_pos_y = var_CreateGetIntegerCommand( p_filter, "audiobargraph_v-y" );
 241     p_BarGraph->i_alpha = var_CreateGetIntegerCommand( p_filter,
 242                                                         "audiobargraph_v-transparency" );
 243     p_BarGraph->i_alpha = VLC_CLIP( p_BarGraph->i_alpha, 0, 255 );
 244     i_values = var_CreateGetStringCommand( p_filter, "audiobargraph_v-i_values" );
 245     //p_BarGraph->nbChannels = 0;
 246     //p_BarGraph->i_values = NULL;
 247     parse_i_values(p_BarGraph, i_values);
 248     p_BarGraph->alarm = var_CreateGetIntegerCommand( p_filter, "audiobargraph_v-alarm" );
 249     p_BarGraph->barWidth = var_CreateGetIntegerCommand( p_filter, "audiobargraph_v-barWidth" );
 250     p_BarGraph->scale = 400;
 251
 252     /* Ignore aligment if a position is given for video filter */
 253     if( !b_sub && p_sys->i_pos_x >= 0 && p_sys->i_pos_y >= 0 )
 254         p_sys->i_pos = 0;
 255
 256     vlc_mutex_init( &p_sys->lock );
 257     LoadBarGraph( p_this, p_BarGraph );
 258     p_sys->b_spu_update = true;
 259
 260     for( int i = 0; ppsz_filter_callbacks[i]; i++ )
 261         var_AddCallback( p_filter, ppsz_filter_callbacks[i],
 262                          BarGraphCallback, p_sys );
 263
 264     /* Misc init */
 265     if( b_sub )
 266     {
 267         p_filter->pf_sub_source = FilterSub;
 268     }
 269     else
 270     {
 271         p_filter->pf_video_filter = FilterVideo;
 272     }
 273
 274     free( i_values );
 275     return VLC_SUCCESS;
 276 }
 277
 278 /**
 279  * Common close function
 280  */
 281 static void Close( vlc_object_t *p_this )
 282 {
 283     filter_t *p_filter = (filter_t *)p_this;
 284     filter_sys_t *p_sys = p_filter->p_sys;
 285     BarGraph_t *p_BarGraph = &(p_sys->p_BarGraph);
 286
 287     for( int i = 0; ppsz_filter_callbacks[i]; i++ )
 288         var_DelCallback( p_filter, ppsz_filter_callbacks[i],
 289                          BarGraphCallback, p_sys );
 290
 291     if( p_sys->p_blend )
 292         filter_DeleteBlend( p_sys->p_blend );
 293
 294     vlc_mutex_destroy( &p_sys->lock );
 295
 296     if( p_BarGraph->p_pic )
 297     {
 298         picture_Release( p_BarGraph->p_pic );
 299         p_BarGraph->p_pic = NULL;
 300     }
 301     free( p_BarGraph->i_values );
 302
 303     free( p_sys );
 304 }
 305
 306 /**
 307  * Sub source
 308  */
 309 static subpicture_t *FilterSub( filter_t *p_filter, mtime_t date )
 310 {
 311     filter_sys_t *p_sys = p_filter->p_sys;
 312     BarGraph_t *p_BarGraph = &(p_sys->p_BarGraph);
 313
 314     subpicture_t *p_spu;
 315     subpicture_region_t *p_region;
 316     video_format_t fmt;
 317     picture_t *p_pic;
 318
 319     vlc_mutex_lock( &p_sys->lock );
 320     /* Basic test:  b_spu_update occurs on a dynamic change */
 321     if( !p_sys->b_spu_update )
 322     {
 323         vlc_mutex_unlock( &p_sys->lock );
 324         return 0;
 325     }
 326
 327     p_pic = p_BarGraph->p_pic;
 328
 329     /* Allocate the subpicture internal data. */
 330     p_spu = filter_NewSubpicture( p_filter );
 331     if( !p_spu )
 332         goto exit;
 333
 334     p_spu->b_absolute = p_sys->b_absolute;
 335     p_spu->i_start = date;
 336     p_spu->i_stop = 0;
 337     p_spu->b_ephemer = true;
 338
 339     /* Send an empty subpicture to clear the display when needed */
 340     if( !p_pic || !p_BarGraph->i_alpha )
 341         goto exit;
 342
 343     /* Create new SPU region */
 344     memset( &fmt, 0, sizeof(video_format_t) );
 345     fmt.i_chroma = VLC_CODEC_YUVA;
 346     fmt.i_sar_num = fmt.i_sar_den = 1;
 347     fmt.i_width = fmt.i_visible_width = p_pic->p[Y_PLANE].i_visible_pitch;
 348     fmt.i_height = fmt.i_visible_height = p_pic->p[Y_PLANE].i_visible_lines;
 349     fmt.i_x_offset = fmt.i_y_offset = 0;
 350     p_region = subpicture_region_New( &fmt );
 351     if( !p_region )
 352     {
 353         msg_Err( p_filter, "cannot allocate SPU region" );
 354         p_filter->pf_sub_buffer_del( p_filter, p_spu );
 355         p_spu = NULL;
 356         goto exit;
 357     }
 358
 359     /* */
 360     picture_Copy( p_region->p_picture, p_pic );
 361
 362     /*  where to locate the bar graph: */
 363     if( p_sys->i_pos < 0 )
 364     {   /*  set to an absolute xy */
 365         p_region->i_align = SUBPICTURE_ALIGN_RIGHT | SUBPICTURE_ALIGN_TOP;
 366         p_spu->b_absolute = true;
 367     }
 368     else
 369     {   /* set to one of the 9 relative locations */
 370         p_region->i_align = p_sys->i_pos;
 371         p_spu->b_absolute = false;
 372     }
 373
 374     p_region->i_x = p_sys->i_pos_x;
 375     p_region->i_y = p_sys->i_pos_y;
 376
 377     p_spu->p_region = p_region;
 378
 379     p_spu->i_alpha = p_BarGraph->i_alpha ;
 380
 381 exit:
 382     vlc_mutex_unlock( &p_sys->lock );
 383
 384     return p_spu;
 385 }
 386
 387 /**
 388  * Video filter
 389  */
 390 static picture_t *FilterVideo( filter_t *p_filter, picture_t *p_src )
 391 {
 392     filter_sys_t *p_sys = p_filter->p_sys;
 393     BarGraph_t *p_BarGraph = &(p_sys->p_BarGraph);
 394
 395     picture_t *p_dst = filter_NewPicture( p_filter );
 396     if( !p_dst )
 397         goto exit;
 398
 399     picture_Copy( p_dst, p_src );
 400
 401     /* */
 402     vlc_mutex_lock( &p_sys->lock );
 403
 404     /* */
 405     const picture_t *p_pic = p_BarGraph->p_pic;
 406     if( p_pic )
 407     {
 408         const video_format_t *p_fmt = &p_pic->format;
 409         const int i_dst_w = p_filter->fmt_out.video.i_visible_width;
 410         const int i_dst_h = p_filter->fmt_out.video.i_visible_height;
 411
 412         if( p_sys->i_pos )
 413         {
 414             if( p_sys->i_pos & SUBPICTURE_ALIGN_BOTTOM )
 415             {
 416                 p_sys->i_pos_y = i_dst_h - p_fmt->i_visible_height;
 417             }
 418             else if ( !(p_sys->i_pos & SUBPICTURE_ALIGN_TOP) )
 419             {
 420                 p_sys->i_pos_y = ( i_dst_h - p_fmt->i_visible_height ) / 2;
 421             }
 422             else
 423             {
 424                 p_sys->i_pos_y = 0;
 425             }
 426
 427             if( p_sys->i_pos & SUBPICTURE_ALIGN_RIGHT )
 428             {
 429                 p_sys->i_pos_x = i_dst_w - p_fmt->i_visible_width;
 430             }
 431             else if ( !(p_sys->i_pos & SUBPICTURE_ALIGN_LEFT) )
 432             {
 433                 p_sys->i_pos_x = ( i_dst_w - p_fmt->i_visible_width ) / 2;
 434             }
 435             else
 436             {
 437                 p_sys->i_pos_x = 0;
 438             }
 439         }
 440
 441         /* */
 442         const int i_alpha = p_BarGraph->i_alpha;
 443         if( filter_ConfigureBlend( p_sys->p_blend, i_dst_w, i_dst_h, p_fmt ) ||
 444             filter_Blend( p_sys->p_blend, p_dst, p_sys->i_pos_x, p_sys->i_pos_y,
 445                           p_pic, i_alpha ) )
 446         {
 447             msg_Err( p_filter, "failed to blend a picture" );
 448         }
 449     }
 450     vlc_mutex_unlock( &p_sys->lock );
 451
 452 exit:
 453     picture_Release( p_src );
 454     return p_dst;
 455 }
 456
 457 /*****************************************************************************
 458  * Callback to update params on the fly
 459  *****************************************************************************/
 460 static int BarGraphCallback( vlc_object_t *p_this, char const *psz_var,
 461                          vlc_value_t oldval, vlc_value_t newval, void *p_data )
 462 {
 463     VLC_UNUSED(oldval);
 464     filter_sys_t *p_sys = (filter_sys_t *)p_data;
 465     BarGraph_t *p_BarGraph = &(p_sys->p_BarGraph);
 466     char* res = NULL;
 467
 468     vlc_mutex_lock( &p_sys->lock );
 469     if ( !strcmp( psz_var, "audiobargraph_v-x" ) )
 470     {
 471         p_sys->i_pos_x = newval.i_int;
 472     }
 473     else if ( !strcmp( psz_var, "audiobargraph_v-y" ) )
 474     {
 475         p_sys->i_pos_y = newval.i_int;
 476     }
 477     else if ( !strcmp( psz_var, "audiobargraph_v-position" ) )
 478     {
 479         p_sys->i_pos = newval.i_int;
 480     }
 481     else if ( !strcmp( psz_var, "audiobargraph_v-transparency" ) )
 482     {
 483         p_BarGraph->i_alpha = VLC_CLIP( newval.i_int, 0, 255 );
 484     }
 485     else if ( !strcmp( psz_var, "audiobargraph_v-i_values" ) )
 486     {
 487         if( p_BarGraph->p_pic )
 488         {
 489             picture_Release( p_BarGraph->p_pic );
 490             p_BarGraph->p_pic = NULL;
 491         }
 492         char *psz_i_values = strdup( newval.psz_string );
 493         free(p_BarGraph->i_values);
 494         //p_BarGraph->i_values = NULL;
 495         //p_BarGraph->nbChannels = 0;
 496         // in case many answer are received at the same time, only keep one
 497         res = strchr(psz_i_values, '@');
 498         if (res)
 499             *res = 0;
 500         parse_i_values( p_BarGraph, psz_i_values);
 501         free( psz_i_values );
 502         LoadBarGraph(p_this,p_BarGraph);
 503     }
 504     else if ( !strcmp( psz_var, "audiobargraph_v-alarm" ) )
 505     {
 506         if( p_BarGraph->p_pic )
 507         {
 508             picture_Release( p_BarGraph->p_pic );
 509             p_BarGraph->p_pic = NULL;
 510         }
 511         p_BarGraph->alarm = newval.i_int;
 512         LoadBarGraph(p_this,p_BarGraph);
 513     }
 514     else if ( !strcmp( psz_var, "audiobargraph_v-barWidth" ) )
 515     {
 516         if( p_BarGraph->p_pic )
 517         {
 518             picture_Release( p_BarGraph->p_pic );
 519             p_BarGraph->p_pic = NULL;
 520         }
 521         p_BarGraph->barWidth = newval.i_int;
 522         LoadBarGraph(p_this,p_BarGraph);
 523     }
 524     p_sys->b_spu_update = true;
 525     vlc_mutex_unlock( &p_sys->lock );
 526
 527     return VLC_SUCCESS;
 528 }
 529
 530 /*****************************************************************************
 531  * LoadImage: creates and returns the bar graph image
 532  *****************************************************************************/
 533 static picture_t *LoadImage( vlc_object_t *p_this, int nbChannels, int* i_values, int scale, int alarm, int barWidth)
 534 {
 535     VLC_UNUSED(p_this);
 536     picture_t *p_pic;
 537     int i, j, pi;
 538     int i_width = 0;
 539     int i_line;
 540     int minus8, minus10, minus18, minus20, minus30, minus40, minus50, minus60;
 541
 542     if (nbChannels == 0) {
 543         i_width = 20;
 544     } else {
 545         i_width = 2 * nbChannels * barWidth + 10;
 546     }
 547     minus8  = iec_scale(-8)*scale + 20;
 548     minus10 = iec_scale(-10)*scale + 20;
 549     minus18 = iec_scale(-18)*scale + 20;
 550     minus20 = iec_scale(-20)*scale + 20;
 551     minus30 = iec_scale(-30)*scale + 20;
 552     minus40 = iec_scale(-40)*scale + 20;
 553     minus50 = iec_scale(-50)*scale + 20;
 554     minus60 = iec_scale(-60)*scale + 20;
 555
 556     p_pic = picture_New(VLC_FOURCC('Y','U','V','A'), i_width+20, scale+30, 1, 1);
 557
 558
 559 #define DrawLine(a,b,Y,U,V,A) \
 560         for (i=a; i<b; i++) {\
 561             *(p_pic->p[0].p_pixels + (scale + 30 - i_line - 1) * p_pic->p[0].i_pitch + i ) = Y;\
 562             *(p_pic->p[1].p_pixels + (scale + 30 - i_line - 1) * p_pic->p[1].i_pitch + i ) = U;\
 563             *(p_pic->p[2].p_pixels + (scale + 30 - i_line - 1) * p_pic->p[2].i_pitch + i ) = V;\
 564             *(p_pic->p[3].p_pixels + (scale + 30 - i_line - 1) * p_pic->p[3].i_pitch + i ) = A; \
 565         }
 566 #define DrawLineBlack(a,b) DrawLine(a,b,0,128,128,0xFF)
 567 #define DrawLineWhite(a,b) DrawLine(a,b,255,128,128,0xFF)
 568
 569     // blacken the whole picture
 570     for( i = 0 ; i < p_pic->i_planes ; i++ )
 571     {
 572         memset( p_pic->p[i].p_pixels, 0x00,
 573                 p_pic->p[i].i_visible_lines * p_pic->p[i].i_pitch );
 574     }
 575
 576
 577     // side bar
 578     for ( i_line = 20; i_line < scale+20; i_line++ ) {
 579         // vertical line
 580         DrawLineBlack(20,22);
 581         DrawLineWhite(22,24);
 582
 583         // -10dB
 584         if (i_line == minus10 - 2) {
 585             // 1
 586             DrawLineBlack(14,15);
 587             // 0
 588             DrawLineBlack(16,19);
 589         }
 590         if (i_line == minus10 - 1) {
 591             // 1
 592             DrawLineBlack(14,15);
 593             // 0
 594             DrawLineBlack(16,17);
 595             DrawLineBlack(18,19);
 596             // limit
 597             DrawLineWhite(24,27); //White
 598         }
 599         if (i_line == minus10) {
 600             // 1
 601             DrawLineBlack(14,15);
 602             // 0
 603             DrawLineBlack(16,17);
 604             DrawLineBlack(18,19);
 605             // limit
 606             DrawLineBlack(24,27);
 607         }
 608         if (i_line == minus10 + 1) {
 609             // 1
 610             DrawLineBlack(14,15);
 611             // 0
 612             DrawLineBlack(16,17);
 613             DrawLineBlack(18,19);
 614             // limit
 615             DrawLineBlack(24,27);
 616         }
 617         if (i_line == minus10 + 2) {
 618             // 1
 619             DrawLineBlack(14,15);
 620             // 0
 621             DrawLineBlack(16,19);
 622         }
 623
 624         // -20dB
 625         if (i_line == minus20 - 2) {
 626             // 2
 627             DrawLineBlack(12,15);
 628             // 0
 629             DrawLineBlack(16,19);
 630         }
 631         if (i_line == minus20 - 1) {
 632             // 2
 633             DrawLineBlack(12,13);
 634             // 0
 635             DrawLineBlack(16,17);
 636             DrawLineBlack(18,19);
 637             // limit
 638             DrawLineWhite(24,27); //White
 639         }
 640         if (i_line == minus20) {
 641             // 2
 642             DrawLineBlack(12,15);
 643             // 0
 644             DrawLineBlack(16,17);
 645             DrawLineBlack(18,19);
 646             // limit
 647             DrawLineBlack(24,27);
 648         }
 649         if (i_line == minus20 + 1) {
 650             // 2
 651             DrawLineBlack(14,15);
 652             // 0
 653             DrawLineBlack(16,17);
 654             DrawLineBlack(18,19);
 655             // limit
 656             DrawLineBlack(24,27);
 657         }
 658         if (i_line == minus20 + 2) {
 659             // 2
 660             DrawLineBlack(12,15);
 661             // 0
 662             DrawLineBlack(16,19);
 663         }
 664
 665         // -30dB
 666         if (i_line == minus30 - 2) {
 667             // 3
 668             DrawLineBlack(12,15);
 669             // 0
 670             DrawLineBlack(16,19);
 671         }
 672         if (i_line == minus30 - 1) {
 673             // 3
 674             DrawLineBlack(14,15);
 675             // 0
 676             DrawLineBlack(16,17);
 677             DrawLineBlack(18,19);
 678             // limit
 679             DrawLineWhite(24,27); //White
 680         }
 681         if (i_line == minus30) {
 682             // 3
 683             DrawLineBlack(12,15);
 684             // 0
 685             DrawLineBlack(16,17);
 686             DrawLineBlack(18,19);
 687             // limit
 688             DrawLineBlack(24,27);
 689         }
 690         if (i_line == minus30 + 1) {
 691             // 3
 692             DrawLineBlack(14,15);
 693             // 0
 694             DrawLineBlack(16,17);
 695             DrawLineBlack(18,19);
 696             // limit
 697             DrawLineBlack(24,27);
 698         }
 699         if (i_line == minus30 + 2) {
 700             // 3
 701             DrawLineBlack(12,15);
 702             // 0
 703             DrawLineBlack(16,19);
 704         }
 705
 706         // -40dB
 707         if (i_line == minus40 - 2) {
 708             // 4
 709             DrawLineBlack(14,15);
 710             // 0
 711             DrawLineBlack(16,19);
 712         }
 713         if (i_line == minus40 - 1) {
 714             // 4
 715             DrawLineBlack(14,15);
 716             // 0
 717             DrawLineBlack(16,17);
 718             DrawLineBlack(18,19);
 719             // limit
 720             DrawLineWhite(24,27); // white
 721         }
 722         if (i_line == minus40) {
 723             // 4
 724             DrawLineBlack(12,15);
 725             // 0
 726             DrawLineBlack(16,17);
 727             DrawLineBlack(18,19);
 728             // limit
 729             DrawLineBlack(24,27);
 730         }
 731         if (i_line == minus40 + 1) {
 732             // 4
 733             DrawLineBlack(12,13);
 734             DrawLineBlack(14,15);
 735             // 0
 736             DrawLineBlack(16,17);
 737             DrawLineBlack(18,19);
 738             // limit
 739             DrawLineBlack(24,27);
 740         }
 741         if (i_line == minus40 + 2) {
 742             // 4
 743             DrawLineBlack(12,13);
 744             DrawLineBlack(14,15);
 745             // 0
 746             DrawLineBlack(16,19);
 747         }
 748
 749         // -50dB
 750         if (i_line == minus50 - 2) {
 751             // 5
 752             DrawLineBlack(12,15);
 753             // 0
 754             DrawLineBlack(16,19);
 755         }
 756         if (i_line == minus50 - 1) {
 757             // 5
 758             DrawLineBlack(14,15);
 759             // 0
 760             DrawLineBlack(16,17);
 761             DrawLineBlack(18,19);
 762             // limit
 763             DrawLineWhite(24,27); //White
 764         }
 765         if (i_line == minus50) {
 766             // 5
 767             DrawLineBlack(12,15);
 768             // 0
 769             DrawLineBlack(16,17);
 770             DrawLineBlack(18,19);
 771             // limit
 772             DrawLineBlack(24,27);
 773         }
 774         if (i_line == minus50 + 1) {
 775             // 5
 776             DrawLineBlack(12,13);
 777             // 0
 778             DrawLineBlack(16,17);
 779             DrawLineBlack(18,19);
 780             // limit
 781             DrawLineBlack(24,27);
 782         }
 783         if (i_line == minus50 + 2) {
 784             // 2
 785             DrawLineBlack(12,15);
 786             // 0
 787             DrawLineBlack(16,19);
 788         }
 789         // -60dB
 790         if (i_line == minus60 - 2) {
 791             // 6
 792             DrawLineBlack(12,15);
 793             // 0
 794             DrawLineBlack(16,19);
 795         }
 796         if (i_line == minus60 - 1) {
 797             // 6
 798             DrawLineBlack(12,13);
 799             DrawLineBlack(14,15);
 800             // 0
 801             DrawLineBlack(16,17);
 802             DrawLineBlack(18,19);
 803             // limit
 804             DrawLineWhite(24,27); //White
 805         }
 806         if (i_line == minus60) {
 807             // 6
 808             DrawLineBlack(12,15);
 809             // 0
 810             DrawLineBlack(16,17);
 811             DrawLineBlack(18,19);
 812             // limit
 813             DrawLineBlack(24,27);
 814         }
 815         if (i_line == minus60 + 1) {
 816             // 6
 817             DrawLineBlack(12,13);
 818             // 0
 819             DrawLineBlack(16,17);
 820             DrawLineBlack(18,19);
 821             // limit
 822             DrawLineBlack(24,27);
 823         }
 824         if (i_line == minus60 + 2) {
 825             // 6
 826             DrawLineBlack(12,15);
 827             // 0
 828             DrawLineBlack(16,19);
 829         }
 830     }
 831
 832 #define drawPoint(offset,y,u,v,a)  \
 833                 *(p_pic->p[0].p_pixels + (scale + 30 - i_line - 1) * p_pic->p[0].i_pitch + offset ) = y; \
 834                 *(p_pic->p[1].p_pixels + (scale + 30 - i_line - 1) * p_pic->p[1].i_pitch + offset ) = u; \
 835                 *(p_pic->p[2].p_pixels + (scale + 30 - i_line - 1) * p_pic->p[2].i_pitch + offset ) = v; \
 836                 *(p_pic->p[3].p_pixels + (scale + 30 - i_line - 1) * p_pic->p[3].i_pitch + offset ) = a;
 837
 838
 839     // draw the bars and channel indicators
 840     for (i=0; i<nbChannels; i++) {
 841         pi =  25 + ((i+1)*5) + (i*barWidth) ;  // 25 separació amb indicador, 5 separació entre barres
 842
 843         for( j = pi; j < pi + barWidth; j++)
 844         {
 845             // channel indicators
 846             for ( i_line = 12; i_line < 20; i_line++ ) {
 847                 if( alarm ) {
 848                     drawPoint(j,76,85,0xFF,0xFF);  // red
 849                 }
 850                 else {
 851                     drawPoint(j,0,128,128,0xFF); // black             DrawLine(pi,pf,0xFF,128,128,0xFF);
 852                 }
 853             }
 854
 855             // bars
 856             for( i_line = 20; i_line < i_values[i]+20; i_line++ )
 857             {
 858                 if (i_line < minus18) { // green if < -18 dB
 859                     drawPoint(j,150,44,21,0xFF);
 860                     //DrawLine(pi,pf,150,44,21,0xFF);
 861                 } else if (i_line < minus8) { // yellow if > -18dB and < -8dB
 862                     drawPoint(j,226,1,148,0xFF);
 863                     //DrawLine(pi,pf,226,1,148,0xFF);
 864                 } else { // red if > -8 dB
 865                     drawPoint(j,76,85,0xFF,0xFF);
 866                     //DrawLine(pi,pf,76,85,255,0xFF);
 867                 }
 868             }
 869             // bars no signal
 870             for( ; i_line < scale+20; i_line++ )
 871             {
 872                 if (i_line < minus18) { // green if < -18 dB
 873                     drawPoint(j,74,85,74,0xFF);
 874                     //DrawLine(pi,pf,74,85,74,0xFF);
 875                 } else if (i_line < minus8) { // yellow if > -18dB and < -8dB
 876                     drawPoint(j,112,64,138,0xFF);
 877                     //DrawLine(pi,pf,112,64,138,0xFF);
 878                 } else { // red if > -8 dB
 879                     drawPoint(j,37,106,191,0xFF);
 880                     //DrawLine(pi,pf,37,106,191,0xFF);
 881                 }
 882             }
 883         }
 884     }
 885
 886     return p_pic;
 887 }
 888
 889 /*****************************************************************************
 890  * LoadBarGraph: loads the BarGraph images into memory
 891  *****************************************************************************/
 892 static void LoadBarGraph( vlc_object_t *p_this, BarGraph_t *p_BarGraph )
 893 {
 894
 895     p_BarGraph->p_pic = LoadImage( p_this, p_BarGraph->nbChannels, p_BarGraph->i_values, p_BarGraph->scale, p_BarGraph->alarm, p_BarGraph->barWidth);
 896     if( !p_BarGraph->p_pic )
 897     {
 898         msg_Warn( p_this, "error while creating picture" );
 899     }
 900
 901 }
 902
 903 /*****************************************************************************
 904  * parse_i_values : parse i_values parameter and store the corresponding values
 905  *****************************************************************************/
 906 void parse_i_values( BarGraph_t *p_BarGraph, char *i_values)
 907 {
 908     char* res = NULL;
 909     char delim[] = ":";
 910     char* tok;
 911     float db;
 912
 913     p_BarGraph->nbChannels = 0;
 914     p_BarGraph->i_values = NULL;
 915     res = strtok_r(i_values, delim, &tok);
 916     while (res != NULL) {
 917         p_BarGraph->nbChannels++;
 918         p_BarGraph->i_values = xrealloc(p_BarGraph->i_values,
 919                                           p_BarGraph->nbChannels*sizeof(int));
 920         db = log10(atof(res)) * 20;
 921         p_BarGraph->i_values[p_BarGraph->nbChannels-1] = VLC_CLIP( iec_scale(db)*p_BarGraph->scale, 0, p_BarGraph->scale );
 922         res = strtok_r(NULL, delim, &tok);
 923     }
 924
 925 }
 926
 927 /*****************************************************************************
 928  * IEC 268-18  Source: meterbridge
 929  *****************************************************************************/
 930 static float iec_scale(float dB)
 931 {
 932        float fScale = 1.0f;
 933
 934        if (dB < -70.0f)
 935               fScale = 0.0f;
 936        else if (dB < -60.0f)
 937               fScale = (dB + 70.0f) * 0.0025f;
 938        else if (dB < -50.0f)
 939               fScale = (dB + 60.0f) * 0.005f + 0.025f;
 940        else if (dB < -40.0)
 941               fScale = (dB + 50.0f) * 0.0075f + 0.075f;
 942        else if (dB < -30.0f)
 943               fScale = (dB + 40.0f) * 0.015f + 0.15f;
 944        else if (dB < -20.0f)
 945               fScale = (dB + 30.0f) * 0.02f + 0.3f;
 946        else if (dB < -0.001f || dB > 0.001f)  /* if (dB < 0.0f) */
 947               fScale = (dB + 20.0f) * 0.025f + 0.5f;
 948
 949        return fScale;
 950 }