video_output.c 74.1 KB
Newer Older
1
/*****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
2
 * video_output.c : video output thread
3
 * (c)2000 VideoLAN
4
 *****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
5 6 7
 * This module describes the programming interface for video output threads.
 * It includes functions allowing to open a new thread, send pictures to a
 * thread, and destroy a previously oppenned video output thread.
8
 *****************************************************************************/
Michel Kaempf's avatar
Michel Kaempf committed
9

10
/*****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
11
 * Preamble
12
 *****************************************************************************/
13
#include <errno.h>
Michel Kaempf's avatar
Michel Kaempf committed
14 15 16
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
Vincent Seguin's avatar
Vincent Seguin committed
17

Michel Kaempf's avatar
Michel Kaempf committed
18 19 20
#include "common.h"
#include "config.h"
#include "mtime.h"
21
#include "vlc_thread.h"
Michel Kaempf's avatar
Michel Kaempf committed
22 23
#include "video.h"
#include "video_output.h"
Vincent Seguin's avatar
Vincent Seguin committed
24
#include "video_text.h"
Vincent Seguin's avatar
Vincent Seguin committed
25
#include "video_sys.h"
26
#include "video_yuv.h"
Vincent Seguin's avatar
Vincent Seguin committed
27
#include "intf_msg.h"
28
#include "main.h"
Vincent Seguin's avatar
Vincent Seguin committed
29

30
/*****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
31
 * Local prototypes
32
 *****************************************************************************/
Vincent Seguin's avatar
Vincent Seguin committed
33 34
static int      BinaryLog         ( u32 i );
static void     MaskToShift       ( int *pi_left, int *pi_right, u32 i_mask );
35 36 37 38 39
static int      InitThread        ( vout_thread_t *p_vout );
static void     RunThread         ( vout_thread_t *p_vout );
static void     ErrorThread       ( vout_thread_t *p_vout );
static void     EndThread         ( vout_thread_t *p_vout );
static void     DestroyThread     ( vout_thread_t *p_vout, int i_status );
40
static void     Print             ( vout_thread_t *p_vout, int i_x, int i_y,
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56
                                    int i_h_align, int i_v_align,
                                    unsigned char *psz_text );
static void     SetBufferArea     ( vout_thread_t *p_vout, int i_x, int i_y,
                                    int i_w, int i_h );
static void     SetBufferPicture  ( vout_thread_t *p_vout, picture_t *p_pic );
static void     RenderPicture     ( vout_thread_t *p_vout, picture_t *p_pic );
static void     RenderPictureInfo ( vout_thread_t *p_vout, picture_t *p_pic );
static void     RenderSubPicture  ( vout_thread_t *p_vout,
                                    subpicture_t *p_subpic );
static void     RenderInterface   ( vout_thread_t *p_vout );
static int      RenderIdle        ( vout_thread_t *p_vout );
static void     RenderInfo        ( vout_thread_t *p_vout );
static int      Manage            ( vout_thread_t *p_vout );
static int      Align             ( vout_thread_t *p_vout, int *pi_x,
                                    int *pi_y, int i_width, int i_height,
                                    int i_h_align, int i_v_align );
57 58
static void     SetPalette        ( p_vout_thread_t p_vout, u16 *red,
                                    u16 *green, u16 *blue, u16 *transp );
Michel Kaempf's avatar
Michel Kaempf committed
59

60
/*****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
61
 * vout_CreateThread: creates a new video output thread
62
 *****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
63 64 65
 * This function creates a new video output thread, and returns a pointer
 * to its description. On error, it returns NULL.
 * If pi_status is NULL, then the function will block until the thread is ready.
66
 * If not, it will be updated using one of the THREAD_* constants.
67 68
 *****************************************************************************/
vout_thread_t * vout_CreateThread               ( char *psz_display, int i_root_window,
Vincent Seguin's avatar
Vincent Seguin committed
69
                                                  int i_width, int i_height, int *pi_status )
Michel Kaempf's avatar
Michel Kaempf committed
70
{
71 72 73
    vout_thread_t * p_vout;                             /* thread descriptor */
    int             i_status;                               /* thread status */
    int             i_index;               /* index for array initialization */
Michel Kaempf's avatar
Michel Kaempf committed
74

75
    /* Allocate descriptor */
76
    intf_DbgMsg("\n");
Michel Kaempf's avatar
Michel Kaempf committed
77
    p_vout = (vout_thread_t *) malloc( sizeof(vout_thread_t) );
78
    if( p_vout == NULL )
Michel Kaempf's avatar
Michel Kaempf committed
79
    {
80
        intf_ErrMsg("error: %s\n", strerror(ENOMEM));
Michel Kaempf's avatar
Michel Kaempf committed
81 82
        return( NULL );
    }
83

84
    /* Initialize thread properties - thread id and locks will be initialized
85
     * later */
86
    p_vout->b_die               = 0;
87
    p_vout->b_error             = 0;
88 89
    p_vout->b_active            = 0;
    p_vout->pi_status           = (pi_status != NULL) ? pi_status : &i_status;
90
    *p_vout->pi_status          = THREAD_CREATE;
91

92
    /* Initialize some fields used by the system-dependant method - these fields will
93
     * probably be modified by the method, and are only preferences */
94
    p_vout->i_changes           = 0;
95 96
    p_vout->i_width             = i_width;
    p_vout->i_height            = i_height;
97
    p_vout->i_bytes_per_line    = i_width * 2;
98 99
    p_vout->i_screen_depth      = 15;
    p_vout->i_bytes_per_pixel   = 2;
100
    p_vout->f_gamma             = VOUT_GAMMA;
101

Vincent Seguin's avatar
Vincent Seguin committed
102
    p_vout->b_grayscale         = main_GetIntVariable( VOUT_GRAYSCALE_VAR, VOUT_GRAYSCALE_DEFAULT );
103
    p_vout->b_info              = 0;
104 105
    p_vout->b_interface         = 0;
    p_vout->b_scale             = 0;
106 107

    p_vout->p_set_palette       = SetPalette;
108

Vincent Seguin's avatar
Vincent Seguin committed
109
    intf_DbgMsg("wished configuration: %dx%d, %d/%d bpp (%d Bpl)\n",
110
                p_vout->i_width, p_vout->i_height, p_vout->i_screen_depth,
Vincent Seguin's avatar
Vincent Seguin committed
111
                p_vout->i_bytes_per_pixel * 8, p_vout->i_bytes_per_line );
112

113 114
    /* Initialize idle screen */
    p_vout->last_display_date   = mdate();
115
    p_vout->last_display_date   = 0;
116 117
    p_vout->last_idle_date      = 0;

118 119
#ifdef STATS
    /* Initialize statistics fields */
120 121 122
    p_vout->render_time         = 0;
    p_vout->c_fps_samples       = 0;
#endif
123 124 125 126

    /* Initialize buffer index */
    p_vout->i_buffer_index      = 0;

127
    /* Initialize pictures and subpictures - translation tables and functions
128
     * will be initialized later in InitThread */
129 130
    for( i_index = 0; i_index < VOUT_MAX_PICTURES; i_index++)
    {
131 132 133 134
        p_vout->p_picture[i_index].i_type   =   EMPTY_PICTURE;
        p_vout->p_picture[i_index].i_status =   FREE_PICTURE;
        p_vout->p_subpicture[i_index].i_type  = EMPTY_SUBPICTURE;
        p_vout->p_subpicture[i_index].i_status= FREE_SUBPICTURE;
135
    }
136

137 138
    /* Create and initialize system-dependant method - this function issues its
     * own error messages */
Vincent Seguin's avatar
Vincent Seguin committed
139
    if( vout_SysCreate( p_vout, psz_display, i_root_window ) )
Michel Kaempf's avatar
Michel Kaempf committed
140
    {
Vincent Seguin's avatar
Vincent Seguin committed
141 142
      free( p_vout );
      return( NULL );
Michel Kaempf's avatar
Michel Kaempf committed
143
    }
Vincent Seguin's avatar
Vincent Seguin committed
144
    intf_DbgMsg("actual configuration: %dx%d, %d/%d bpp (%d Bpl), masks: 0x%x/0x%x/0x%x\n",
145
                p_vout->i_width, p_vout->i_height, p_vout->i_screen_depth,
Vincent Seguin's avatar
Vincent Seguin committed
146 147 148 149 150 151 152 153
                p_vout->i_bytes_per_pixel * 8, p_vout->i_bytes_per_line,
                p_vout->i_red_mask, p_vout->i_green_mask, p_vout->i_blue_mask );

    /* Calculate shifts from system-updated masks */
    MaskToShift( &p_vout->i_red_lshift,   &p_vout->i_red_rshift,   p_vout->i_red_mask );
    MaskToShift( &p_vout->i_green_lshift, &p_vout->i_green_rshift, p_vout->i_green_mask );
    MaskToShift( &p_vout->i_blue_lshift,  &p_vout->i_blue_rshift,  p_vout->i_blue_mask );

154
    /* Set some useful colors */
155
    p_vout->i_white_pixel = RGB2PIXEL( p_vout, 255, 255, 255 );
Vincent Seguin's avatar
Vincent Seguin committed
156 157
    p_vout->i_black_pixel = RGB2PIXEL( p_vout, 0, 0, 0 );
    p_vout->i_gray_pixel  = RGB2PIXEL( p_vout, 128, 128, 128 );
158
    p_vout->i_blue_pixel  = RGB2PIXEL( p_vout, 0, 0, 50 );
159

160 161
    /* Load fonts - fonts must be initialized after the systme method since
     * they may be dependant of screen depth and other thread properties */
162
    p_vout->p_default_font      = vout_LoadFont( VOUT_DEFAULT_FONT );
Vincent Seguin's avatar
Vincent Seguin committed
163 164
    if( p_vout->p_default_font == NULL )
    {
165 166 167 168 169
        vout_SysDestroy( p_vout );
        free( p_vout );
        return( NULL );
    }
    p_vout->p_large_font        = vout_LoadFont( VOUT_LARGE_FONT );
Vincent Seguin's avatar
Vincent Seguin committed
170 171
    if( p_vout->p_large_font == NULL )
    {
172 173 174 175 176
        vout_UnloadFont( p_vout->p_default_font );
        vout_SysDestroy( p_vout );
        free( p_vout );
        return( NULL );
    }
Vincent Seguin's avatar
Vincent Seguin committed
177

Michel Kaempf's avatar
Michel Kaempf committed
178
    /* Create thread and set locks */
Vincent Seguin's avatar
Vincent Seguin committed
179
    vlc_mutex_init( &p_vout->picture_lock );
180 181 182
    vlc_mutex_init( &p_vout->subpicture_lock );
    vlc_mutex_init( &p_vout->change_lock );
    vlc_mutex_lock( &p_vout->change_lock );
Vincent Seguin's avatar
Vincent Seguin committed
183
    if( vlc_thread_create( &p_vout->thread_id, "video output", (void *) RunThread, (void *) p_vout) )
Michel Kaempf's avatar
Michel Kaempf committed
184
    {
185
        intf_ErrMsg("error: %s\n", strerror(ENOMEM));
Vincent Seguin's avatar
Vincent Seguin committed
186
        vout_UnloadFont( p_vout->p_default_font );
187
        vout_UnloadFont( p_vout->p_large_font );
Vincent Seguin's avatar
Vincent Seguin committed
188
	vout_SysDestroy( p_vout );
Michel Kaempf's avatar
Michel Kaempf committed
189 190
        free( p_vout );
        return( NULL );
191
    }
Michel Kaempf's avatar
Michel Kaempf committed
192

193
    intf_Msg("Video display initialized (%dx%d, %d/%d bpp)\n", p_vout->i_width,
Vincent Seguin's avatar
Vincent Seguin committed
194
             p_vout->i_height, p_vout->i_screen_depth, p_vout->i_bytes_per_pixel * 8 );
195

Michel Kaempf's avatar
Michel Kaempf committed
196 197 198 199
    /* If status is NULL, wait until the thread is created */
    if( pi_status == NULL )
    {
        do
200
        {
Michel Kaempf's avatar
Michel Kaempf committed
201
            msleep( THREAD_SLEEP );
202
        }while( (i_status != THREAD_READY) && (i_status != THREAD_ERROR)
Michel Kaempf's avatar
Michel Kaempf committed
203 204 205
                && (i_status != THREAD_FATAL) );
        if( i_status != THREAD_READY )
        {
206 207
            return( NULL );
        }
Michel Kaempf's avatar
Michel Kaempf committed
208 209 210 211
    }
    return( p_vout );
}

212
/*****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
213
 * vout_DestroyThread: destroys a previously created thread
214 215
 *****************************************************************************
 * Destroy a terminated thread.
Michel Kaempf's avatar
Michel Kaempf committed
216
 * The function will request a destruction of the specified thread. If pi_error
217
 * is NULL, it will return once the thread is destroyed. Else, it will be
Michel Kaempf's avatar
Michel Kaempf committed
218
 * update using one of the THREAD_* constants.
219
 *****************************************************************************/
Michel Kaempf's avatar
Michel Kaempf committed
220
void vout_DestroyThread( vout_thread_t *p_vout, int *pi_status )
221 222
{
    int     i_status;                                       /* thread status */
Michel Kaempf's avatar
Michel Kaempf committed
223 224

    /* Set status */
225
    intf_DbgMsg("\n");
Michel Kaempf's avatar
Michel Kaempf committed
226
    p_vout->pi_status = (pi_status != NULL) ? pi_status : &i_status;
227 228
    *p_vout->pi_status = THREAD_DESTROY;

Michel Kaempf's avatar
Michel Kaempf committed
229 230 231 232
    /* Request thread destruction */
    p_vout->b_die = 1;

    /* If status is NULL, wait until thread has been destroyed */
233
    if( pi_status == NULL )
Michel Kaempf's avatar
Michel Kaempf committed
234 235 236 237
    {
        do
        {
            msleep( THREAD_SLEEP );
238 239
        }while( (i_status != THREAD_OVER) && (i_status != THREAD_ERROR)
                && (i_status != THREAD_FATAL) );
Michel Kaempf's avatar
Michel Kaempf committed
240 241 242
    }
}

243
/*****************************************************************************
244
 * vout_DisplaySubPicture: display a subpicture unit
245 246
 *****************************************************************************
 * Remove the reservation flag of an subpicture, which will cause it to be ready
247
 * for display. The picture does not need to be locked, since it is ignored by
Vincent Seguin's avatar
Vincent Seguin committed
248
 * the output thread if is reserved.
249
 *****************************************************************************/
250
void  vout_DisplaySubPicture( vout_thread_t *p_vout, subpicture_t *p_subpic )
Vincent Seguin's avatar
Vincent Seguin committed
251 252
{
#ifdef DEBUG_VIDEO
253 254
    char        psz_begin_date[MSTRTIME_MAX_SIZE]; /* buffer for date string */
    char        psz_end_date[MSTRTIME_MAX_SIZE];   /* buffer for date string */
Vincent Seguin's avatar
Vincent Seguin committed
255 256 257 258
#endif

#ifdef DEBUG
    /* Check if status is valid */
259
    if( p_subpic->i_status != RESERVED_SUBPICTURE )
Vincent Seguin's avatar
Vincent Seguin committed
260
    {
261 262 263
        intf_DbgMsg("error: subpicture %p has invalid status %d\n", p_subpic,
                    p_subpic->i_status );
    }
Vincent Seguin's avatar
Vincent Seguin committed
264 265 266
#endif

    /* Remove reservation flag */
267
    p_subpic->i_status = READY_SUBPICTURE;
Vincent Seguin's avatar
Vincent Seguin committed
268 269

#ifdef DEBUG_VIDEO
270
    /* Send subpicture informations */
271 272 273 274
    intf_DbgMsg("subpicture %p: type=%d, begin date=%s, end date=%s\n",
                p_subpic, p_subpic->i_type,
                mstrtime( psz_begin_date, p_subpic->begin_date ),
                mstrtime( psz_end_date, p_subpic->end_date ) );
Vincent Seguin's avatar
Vincent Seguin committed
275 276 277
#endif
}

278
/*****************************************************************************
279
 * vout_CreateSubPicture: allocate an subpicture in the video output heap.
280 281
 *****************************************************************************
 * This function create a reserved subpicture in the video output heap.
Vincent Seguin's avatar
Vincent Seguin committed
282
 * A null pointer is returned if the function fails. This method provides an
283
 * already allocated zone of memory in the spu data fields. It needs locking
284 285 286
 * since several pictures can be created by several producers threads.
 *****************************************************************************/
subpicture_t *vout_CreateSubPicture( vout_thread_t *p_vout, int i_type,
287
                                     int i_size )
Vincent Seguin's avatar
Vincent Seguin committed
288
{
289 290 291
    int                 i_subpic;                        /* subpicture index */
    subpicture_t *      p_free_subpic = NULL;       /* first free subpicture */
    subpicture_t *      p_destroyed_subpic = NULL; /* first destroyed subpic */
292 293 294 295

    /* Get lock */
    vlc_mutex_lock( &p_vout->subpicture_lock );

296 297
    /*
     * Look for an empty place
298 299 300 301 302 303 304 305 306
     */
    for( i_subpic = 0; i_subpic < VOUT_MAX_PICTURES; i_subpic++ )
    {
	if( p_vout->p_subpicture[i_subpic].i_status == DESTROYED_SUBPICTURE )
	{
	    /* Subpicture is marked for destruction, but is still allocated */
	    if( (p_vout->p_subpicture[i_subpic].i_type  == i_type)   &&
		(p_vout->p_subpicture[i_subpic].i_size  >= i_size) )
	    {
307 308
		/* Memory size do match or is smaller : memory will not be reallocated,
                 * and function can end immediately - this is the best possible case,
309 310 311
                 * since no memory allocation needs to be done */
		p_vout->p_subpicture[i_subpic].i_status = RESERVED_SUBPICTURE;
#ifdef DEBUG_VIDEO
312 313
                intf_DbgMsg("subpicture %p (in destroyed subpicture slot)\n",
                            &p_vout->p_subpicture[i_subpic] );
314 315 316 317 318 319 320 321
#endif
		vlc_mutex_unlock( &p_vout->subpicture_lock );
		return( &p_vout->p_subpicture[i_subpic] );
	    }
	    else if( p_destroyed_subpic == NULL )
	    {
		/* Memory size do not match, but subpicture index will be kept in
		 * case no other place are left */
322 323
		p_destroyed_subpic = &p_vout->p_subpicture[i_subpic];
	    }	
324
	}
325
        else if( (p_free_subpic == NULL) &&
326 327 328 329 330 331 332 333 334
                 (p_vout->p_subpicture[i_subpic].i_status == FREE_SUBPICTURE ))
        {
	    /* Subpicture is empty and ready for allocation */
            p_free_subpic = &p_vout->p_subpicture[i_subpic];
        }
    }

    /* If no free subpicture is available, use a destroyed subpicture */
    if( (p_free_subpic == NULL) && (p_destroyed_subpic != NULL ) )
335
    {
336 337
	/* No free subpicture or matching destroyed subpicture has been found, but
	 * a destroyed subpicture is still avalaible */
338
        free( p_destroyed_subpic->p_data );
339 340 341 342 343 344 345 346 347 348 349
        p_free_subpic = p_destroyed_subpic;
    }

    /*
     * Prepare subpicture
     */
    if( p_free_subpic != NULL )
    {
        /* Allocate memory */
        switch( i_type )
        {
350 351
        case TEXT_SUBPICTURE:                             /* text subpicture */
            p_free_subpic->p_data = malloc( i_size + 1 );
352 353 354 355
            break;
#ifdef DEBUG
        default:
            intf_DbgMsg("error: unknown subpicture type %d\n", i_type );
356 357 358
            p_free_subpic->p_data   =  NULL;
            break;
#endif
359 360 361 362 363 364
        }

        if( p_free_subpic->p_data != NULL )
        {                    /* Copy subpicture informations, set some default values */
            p_free_subpic->i_type                      = i_type;
            p_free_subpic->i_status                    = RESERVED_SUBPICTURE;
365
            p_free_subpic->i_size                      = i_size;
366
            p_free_subpic->i_x                         = 0;
367
            p_free_subpic->i_y                         = 0;
368 369
            p_free_subpic->i_width                     = 0;
            p_free_subpic->i_height                    = 0;
370 371
            p_free_subpic->i_horizontal_align          = CENTER_RALIGN;
            p_free_subpic->i_vertical_align            = CENTER_RALIGN;
372 373 374 375
        }
        else
        {
            /* Memory allocation failed : set subpicture as empty */
376 377 378 379
            p_free_subpic->i_type   =  EMPTY_SUBPICTURE;
            p_free_subpic->i_status =  FREE_SUBPICTURE;
            p_free_subpic =            NULL;
            intf_ErrMsg("warning: %s\n", strerror( ENOMEM ) );
380
        }
381

382
#ifdef DEBUG_VIDEO
383
        intf_DbgMsg("subpicture %p (in free subpicture slot)\n", p_free_subpic );
384 385 386 387
#endif
        vlc_mutex_unlock( &p_vout->subpicture_lock );
        return( p_free_subpic );
    }
388

389 390 391 392
    /* No free or destroyed subpicture could be found */
    intf_DbgMsg( "warning: heap is full\n" );
    vlc_mutex_unlock( &p_vout->subpicture_lock );
    return( NULL );
Vincent Seguin's avatar
Vincent Seguin committed
393 394
}

395
/*****************************************************************************
396
 * vout_DestroySubPicture: remove a subpicture from the heap
397
 *****************************************************************************
398
 * This function frees a previously reserved subpicture.
Vincent Seguin's avatar
Vincent Seguin committed
399
 * It is meant to be used when the construction of a picture aborted.
400
 * This function does not need locking since reserved subpictures are ignored
401
 * by the output thread.
402
 *****************************************************************************/
403
void vout_DestroySubPicture( vout_thread_t *p_vout, subpicture_t *p_subpic )
Vincent Seguin's avatar
Vincent Seguin committed
404 405
{
#ifdef DEBUG
406 407
   /* Check if status is valid */
   if( p_subpic->i_status != RESERVED_SUBPICTURE )
Vincent Seguin's avatar
Vincent Seguin committed
408
   {
409 410 411
       intf_DbgMsg("error: subpicture %p has invalid status %d\n",
                   p_subpic, p_subpic->i_status );
   }
Vincent Seguin's avatar
Vincent Seguin committed
412 413
#endif

414
    p_subpic->i_status = DESTROYED_SUBPICTURE;
Vincent Seguin's avatar
Vincent Seguin committed
415 416

#ifdef DEBUG_VIDEO
417
    intf_DbgMsg("subpicture %p\n", p_subpic);
Vincent Seguin's avatar
Vincent Seguin committed
418 419 420
#endif
}

421
/*****************************************************************************
Vincent Seguin's avatar
Vincent Seguin committed
422
 * vout_DisplayPicture: display a picture
423
 *****************************************************************************
Vincent Seguin's avatar
Vincent Seguin committed
424
 * Remove the reservation flag of a picture, which will cause it to be ready for
425
 * display. The picture won't be displayed until vout_DatePicture has been
426
 * called.
427
 *****************************************************************************/
Vincent Seguin's avatar
Vincent Seguin committed
428
void  vout_DisplayPicture( vout_thread_t *p_vout, picture_t *p_pic )
Michel Kaempf's avatar
Michel Kaempf committed
429
{
430 431
    vlc_mutex_lock( &p_vout->picture_lock );
    switch( p_pic->i_status )
432
    {
433
    case RESERVED_PICTURE:
434
        p_pic->i_status = RESERVED_DISP_PICTURE;
435
        break;
436 437
    case RESERVED_DATED_PICTURE:
        p_pic->i_status = READY_PICTURE;
438
        break;
439
#ifdef DEBUG
440 441 442
    default:
        intf_DbgMsg("error: picture %p has invalid status %d\n", p_pic, p_pic->i_status );
        break;
443
#endif
444
    }
Michel Kaempf's avatar
Michel Kaempf committed
445

446
#ifdef DEBUG_VIDEO
Vincent Seguin's avatar
Vincent Seguin committed
447
    intf_DbgMsg("picture %p\n", p_pic);
448
#endif
449
    vlc_mutex_unlock( &p_vout->picture_lock );
Michel Kaempf's avatar
Michel Kaempf committed
450 451
}

452
/*****************************************************************************
453
 * vout_DatePicture: date a picture
454
 *****************************************************************************
455
 * Remove the reservation flag of a picture, which will cause it to be ready for
456
 * display. The picture won't be displayed until vout_DisplayPicture has been
457
 * called.
458
 *****************************************************************************/
459 460
void  vout_DatePicture( vout_thread_t *p_vout, picture_t *p_pic, mtime_t date )
{
Vincent Seguin's avatar
Vincent Seguin committed
461
#ifdef DEBUG_VIDEO
462
    char        psz_date[MSTRTIME_MAX_SIZE];                         /* date */
Vincent Seguin's avatar
Vincent Seguin committed
463 464
#endif

465
    vlc_mutex_lock( &p_vout->picture_lock );
466
    p_pic->date = date;
467 468
    switch( p_pic->i_status )
    {
469
    case RESERVED_PICTURE:
470
        p_pic->i_status = RESERVED_DATED_PICTURE;
471
        break;
472 473
    case RESERVED_DISP_PICTURE:
        p_pic->i_status = READY_PICTURE;
474
        break;
475
#ifdef DEBUG
476 477 478
    default:
        intf_DbgMsg("error: picture %p has invalid status %d\n", p_pic, p_pic->i_status );
        break;
479 480 481 482
#endif
    }

#ifdef DEBUG_VIDEO
Vincent Seguin's avatar
Vincent Seguin committed
483
    intf_DbgMsg("picture %p, display date: %s\n", p_pic, mstrtime( psz_date, p_pic->date) );
484
#endif
485
    vlc_mutex_unlock( &p_vout->picture_lock );
486 487
}

488
/*****************************************************************************
Vincent Seguin's avatar
Vincent Seguin committed
489
 * vout_CreatePicture: allocate a picture in the video output heap.
490 491
 *****************************************************************************
 * This function create a reserved image in the video output heap.
Vincent Seguin's avatar
Vincent Seguin committed
492
 * A null pointer is returned if the function fails. This method provides an
493
 * already allocated zone of memory in the picture data fields. It needs locking
494 495 496
 * since several pictures can be created by several producers threads.
 *****************************************************************************/
picture_t *vout_CreatePicture( vout_thread_t *p_vout, int i_type,
497
			       int i_width, int i_height )
Michel Kaempf's avatar
Michel Kaempf committed
498
{
499 500 501 502
    int         i_picture;                                  /* picture index */
    int         i_chroma_width = 0;                          /* chroma width */
    picture_t * p_free_picture = NULL;                 /* first free picture */
    picture_t * p_destroyed_picture = NULL;       /* first destroyed picture */
Michel Kaempf's avatar
Michel Kaempf committed
503

Vincent Seguin's avatar
Vincent Seguin committed
504
    /* Get lock */
Vincent Seguin's avatar
Vincent Seguin committed
505
    vlc_mutex_lock( &p_vout->picture_lock );
Michel Kaempf's avatar
Michel Kaempf committed
506

507 508
    /*
     * Look for an empty place
Vincent Seguin's avatar
Vincent Seguin committed
509
     */
510
    for( i_picture = 0; i_picture < VOUT_MAX_PICTURES; i_picture++ )
Vincent Seguin's avatar
Vincent Seguin committed
511 512 513
    {
	if( p_vout->p_picture[i_picture].i_status == DESTROYED_PICTURE )
	{
514
	    /* Picture is marked for destruction, but is still allocated - note
515
             * that if width and type are the same for two pictures, chroma_width
516
             * should also be the same */
Vincent Seguin's avatar
Vincent Seguin committed
517 518
	    if( (p_vout->p_picture[i_picture].i_type           == i_type)   &&
		(p_vout->p_picture[i_picture].i_height         == i_height) &&
519
		(p_vout->p_picture[i_picture].i_width          == i_width) )
Vincent Seguin's avatar
Vincent Seguin committed
520 521 522 523 524
	    {
		/* Memory size do match : memory will not be reallocated, and function
                 * can end immediately - this is the best possible case, since no
                 * memory allocation needs to be done */
		p_vout->p_picture[i_picture].i_status = RESERVED_PICTURE;
525
#ifdef DEBUG_VIDEO
526 527
                intf_DbgMsg("picture %p (in destroyed picture slot)\n",
                            &p_vout->p_picture[i_picture] );
528
#endif
Vincent Seguin's avatar
Vincent Seguin committed
529
		vlc_mutex_unlock( &p_vout->picture_lock );
Vincent Seguin's avatar
Vincent Seguin committed
530 531 532 533 534 535
		return( &p_vout->p_picture[i_picture] );
	    }
	    else if( p_destroyed_picture == NULL )
	    {
		/* Memory size do not match, but picture index will be kept in
		 * case no other place are left */
536 537
		p_destroyed_picture = &p_vout->p_picture[i_picture];
	    }	
Vincent Seguin's avatar
Vincent Seguin committed
538
	}
539
        else if( (p_free_picture == NULL) &&
Vincent Seguin's avatar
Vincent Seguin committed
540 541 542
                 (p_vout->p_picture[i_picture].i_status == FREE_PICTURE ))
        {
	    /* Picture is empty and ready for allocation */
543
            p_free_picture = &p_vout->p_picture[i_picture];
Vincent Seguin's avatar
Vincent Seguin committed
544
        }
Michel Kaempf's avatar
Michel Kaempf committed
545 546
    }

Vincent Seguin's avatar
Vincent Seguin committed
547 548
    /* If no free picture is available, use a destroyed picture */
    if( (p_free_picture == NULL) && (p_destroyed_picture != NULL ) )
549
    {
Vincent Seguin's avatar
Vincent Seguin committed
550 551
	/* No free picture or matching destroyed picture has been found, but
	 * a destroyed picture is still avalaible */
552 553
        free( p_destroyed_picture->p_data );
        p_free_picture = p_destroyed_picture;
Michel Kaempf's avatar
Michel Kaempf committed
554 555
    }

Vincent Seguin's avatar
Vincent Seguin committed
556 557 558 559 560 561 562
    /*
     * Prepare picture
     */
    if( p_free_picture != NULL )
    {
        /* Allocate memory */
        switch( i_type )
Michel Kaempf's avatar
Michel Kaempf committed
563
        {
564 565
        case YUV_420_PICTURE:        /* YUV 420: 1,1/4,1/4 samples per pixel */
            i_chroma_width = i_width / 2;
Vincent Seguin's avatar
Vincent Seguin committed
566
            p_free_picture->p_data = malloc( i_height * i_chroma_width * 3 * sizeof( yuv_data_t ) );
567
            p_free_picture->p_y = (yuv_data_t *)p_free_picture->p_data;
Vincent Seguin's avatar
Vincent Seguin committed
568 569
            p_free_picture->p_u = (yuv_data_t *)p_free_picture->p_data +i_height*i_chroma_width*4/2;
            p_free_picture->p_v = (yuv_data_t *)p_free_picture->p_data +i_height*i_chroma_width*5/2;
570
            break;
571 572
        case YUV_422_PICTURE:        /* YUV 422: 1,1/2,1/2 samples per pixel */
            i_chroma_width = i_width / 2;
573 574
            p_free_picture->p_data = malloc( i_height * i_chroma_width * 4 * sizeof( yuv_data_t ) );
            p_free_picture->p_y = (yuv_data_t *)p_free_picture->p_data;
Vincent Seguin's avatar
Vincent Seguin committed
575 576
            p_free_picture->p_u = (yuv_data_t *)p_free_picture->p_data +i_height*i_chroma_width*2;
            p_free_picture->p_v = (yuv_data_t *)p_free_picture->p_data +i_height*i_chroma_width*3;
577
            break;
578 579
        case YUV_444_PICTURE:            /* YUV 444: 1,1,1 samples per pixel */
            i_chroma_width = i_width;
580 581
            p_free_picture->p_data = malloc( i_height * i_chroma_width * 3 * sizeof( yuv_data_t ) );
            p_free_picture->p_y = (yuv_data_t *)p_free_picture->p_data;
Vincent Seguin's avatar
Vincent Seguin committed
582 583
            p_free_picture->p_u = (yuv_data_t *)p_free_picture->p_data +i_height*i_chroma_width;
            p_free_picture->p_v = (yuv_data_t *)p_free_picture->p_data +i_height*i_chroma_width*2;
584
            break;
Vincent Seguin's avatar
Vincent Seguin committed
585 586
#ifdef DEBUG
        default:
587
            intf_DbgMsg("error: unknown picture type %d\n", i_type );
588 589 590
            p_free_picture->p_data   =  NULL;
            break;
#endif
Michel Kaempf's avatar
Michel Kaempf committed
591 592
        }

Vincent Seguin's avatar
Vincent Seguin committed
593
        if( p_free_picture->p_data != NULL )
594
        {
595
            /* Copy picture informations, set some default values */
596 597
            p_free_picture->i_type                      = i_type;
            p_free_picture->i_status                    = RESERVED_PICTURE;
598
            p_free_picture->i_matrix_coefficients       = 1;
599 600
            p_free_picture->i_width                     = i_width;
            p_free_picture->i_height                    = i_height;
601
            p_free_picture->i_chroma_width              = i_chroma_width;
602
            p_free_picture->i_display_horizontal_offset = 0;
603
            p_free_picture->i_display_vertical_offset   = 0;
604 605
            p_free_picture->i_display_width             = i_width;
            p_free_picture->i_display_height            = i_height;
606 607
            p_free_picture->i_aspect_ratio              = AR_SQUARE_PICTURE;
            p_free_picture->i_refcount                  = 0;
Vincent Seguin's avatar
Vincent Seguin committed
608 609 610 611
        }
        else
        {
            /* Memory allocation failed : set picture as empty */
612 613 614 615
            p_free_picture->i_type   =  EMPTY_PICTURE;
            p_free_picture->i_status =  FREE_PICTURE;
            p_free_picture =            NULL;
            intf_ErrMsg("warning: %s\n", strerror( ENOMEM ) );
Vincent Seguin's avatar
Vincent Seguin committed
616
        }
617

618
#ifdef DEBUG_VIDEO
619
        intf_DbgMsg("picture %p (in free picture slot)\n", p_free_picture );
620
#endif
Vincent Seguin's avatar
Vincent Seguin committed
621
        vlc_mutex_unlock( &p_vout->picture_lock );
Vincent Seguin's avatar
Vincent Seguin committed
622
        return( p_free_picture );
Michel Kaempf's avatar
Michel Kaempf committed
623
    }
624

625
    /* No free or destroyed picture could be found */
626
    intf_DbgMsg( "warning: heap is full\n" );
Vincent Seguin's avatar
Vincent Seguin committed
627
    vlc_mutex_unlock( &p_vout->picture_lock );
Vincent Seguin's avatar
Vincent Seguin committed
628
    return( NULL );
Michel Kaempf's avatar
Michel Kaempf committed
629 630
}

631
/*****************************************************************************
632
 * vout_DestroyPicture: remove a permanent or reserved picture from the heap
633
 *****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
634
 * This function frees a previously reserved picture or a permanent
Vincent Seguin's avatar
Vincent Seguin committed
635 636
 * picture. It is meant to be used when the construction of a picture aborted.
 * Note that the picture will be destroyed even if it is linked !
637 638
 * This function does not need locking since reserved pictures are ignored by
 * the output thread.
639
 *****************************************************************************/
Vincent Seguin's avatar
Vincent Seguin committed
640
void vout_DestroyPicture( vout_thread_t *p_vout, picture_t *p_pic )
Michel Kaempf's avatar
Michel Kaempf committed
641
{
642
#ifdef DEBUG
643
   /* Check if picture status is valid */
644
   if( (p_pic->i_status != RESERVED_PICTURE) &&
645 646
       (p_pic->i_status != RESERVED_DATED_PICTURE) &&
       (p_pic->i_status != RESERVED_DISP_PICTURE) )
647
   {
648 649
       intf_DbgMsg("error: picture %p has invalid status %d\n", p_pic, p_pic->i_status );
   }
650 651
#endif

Vincent Seguin's avatar
Vincent Seguin committed
652
    p_pic->i_status = DESTROYED_PICTURE;
653 654

#ifdef DEBUG_VIDEO
655
    intf_DbgMsg("picture %p\n", p_pic);
656
#endif
Michel Kaempf's avatar
Michel Kaempf committed
657 658
}

659
/*****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
660
 * vout_LinkPicture: increment reference counter of a picture
661
 *****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
662
 * This function increment the reference counter of a picture in the video
663
 * heap. It needs a lock since several producer threads can access the picture.
664
 *****************************************************************************/
Michel Kaempf's avatar
Michel Kaempf committed
665 666
void vout_LinkPicture( vout_thread_t *p_vout, picture_t *p_pic )
{
Vincent Seguin's avatar
Vincent Seguin committed
667
    vlc_mutex_lock( &p_vout->picture_lock );
Michel Kaempf's avatar
Michel Kaempf committed
668
    p_pic->i_refcount++;
669 670

#ifdef DEBUG_VIDEO
671
    intf_DbgMsg("picture %p refcount=%d\n", p_pic, p_pic->i_refcount );
672
#endif
673 674

    vlc_mutex_unlock( &p_vout->picture_lock );
Michel Kaempf's avatar
Michel Kaempf committed
675 676
}

677
/*****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
678
 * vout_UnlinkPicture: decrement reference counter of a picture
679
 *****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
680
 * This function decrement the reference counter of a picture in the video heap.
681
 *****************************************************************************/
Michel Kaempf's avatar
Michel Kaempf committed
682 683
void vout_UnlinkPicture( vout_thread_t *p_vout, picture_t *p_pic )
{
Vincent Seguin's avatar
Vincent Seguin committed
684
    vlc_mutex_lock( &p_vout->picture_lock );
Michel Kaempf's avatar
Michel Kaempf committed
685
    p_pic->i_refcount--;
686 687 688 689 690

#ifdef DEBUG_VIDEO
    if( p_pic->i_refcount < 0 )
    {
        intf_DbgMsg("error: refcount < 0\n");
691 692
        p_pic->i_refcount = 0;
    }
693 694
#endif

Vincent Seguin's avatar
Vincent Seguin committed
695
    if( (p_pic->i_refcount == 0) && (p_pic->i_status == DISPLAYED_PICTURE) )
Michel Kaempf's avatar
Michel Kaempf committed
696
    {
Vincent Seguin's avatar
Vincent Seguin committed
697
	p_pic->i_status = DESTROYED_PICTURE;
Michel Kaempf's avatar
Michel Kaempf committed
698
    }
699 700

#ifdef DEBUG_VIDEO
701
    intf_DbgMsg("picture %p refcount=%d\n", p_pic, p_pic->i_refcount );
702
#endif
703 704

    vlc_mutex_unlock( &p_vout->picture_lock );
Michel Kaempf's avatar
Michel Kaempf committed
705 706
}

707
/*****************************************************************************
708
 * vout_SetBuffers: set buffers adresses
709 710
 *****************************************************************************
 * This function is called by system drivers to set buffers video memory
711
 * adresses.
712
 *****************************************************************************/
713
void vout_SetBuffers( vout_thread_t *p_vout, void *p_buf1, void *p_buf2 )
714 715
{
    /* No picture previously */
716 717 718 719 720 721 722 723
    p_vout->p_buffer[0].i_pic_x =         0;
    p_vout->p_buffer[0].i_pic_y =         0;
    p_vout->p_buffer[0].i_pic_width =     0;
    p_vout->p_buffer[0].i_pic_height =    0;
    p_vout->p_buffer[1].i_pic_x =         0;
    p_vout->p_buffer[1].i_pic_y =         0;
    p_vout->p_buffer[1].i_pic_width =     0;
    p_vout->p_buffer[1].i_pic_height =    0;
724 725

    /* The first area covers all the screen */
726 727 728 729 730 731 732 733
    p_vout->p_buffer[0].i_areas =                 1;
    p_vout->p_buffer[0].pi_area_begin[0] =        0;
    p_vout->p_buffer[0].pi_area_end[0] =          p_vout->i_height - 1;
    p_vout->p_buffer[1].i_areas =                 1;
    p_vout->p_buffer[1].pi_area_begin[0] =        0;
    p_vout->p_buffer[1].pi_area_end[0] =          p_vout->i_height - 1;

    /* Set adresses */
734 735
    p_vout->p_buffer[0].p_data = p_buf1;
    p_vout->p_buffer[1].p_data = p_buf2;
736 737
}

Vincent Seguin's avatar
Vincent Seguin committed
738 739 740 741 742 743 744 745 746 747 748 749 750
/*****************************************************************************
 * vout_Pixel2RGB: return red, green and blue from pixel value
 *****************************************************************************
 * Return color values, in 0-255 range, of the decomposition of a pixel. This
 * is a slow routine and should only be used for initialization phase.
 *****************************************************************************/
void vout_Pixel2RGB( vout_thread_t *p_vout, u32 i_pixel, int *pi_red, int *pi_green, int *pi_blue )
{
    *pi_red =   i_pixel & p_vout->i_red_mask;
    *pi_green = i_pixel & p_vout->i_green_mask;
    *pi_blue =  i_pixel & p_vout->i_blue_mask;
}

Michel Kaempf's avatar
Michel Kaempf committed
751 752
/* following functions are local */

Vincent Seguin's avatar
Vincent Seguin committed
753 754 755
/*****************************************************************************
 * BinaryLog: computes the base 2 log of a binary value
 *****************************************************************************
756
 * This functions is used by MaskToShift, to get a bit index from a binary
Vincent Seguin's avatar
Vincent Seguin committed
757 758 759 760 761 762 763
 * value.
 *****************************************************************************/
static int BinaryLog(u32 i)
{
    int i_log;

    i_log = 0;
764 765
    if (i & 0xffff0000)
    {
Vincent Seguin's avatar
Vincent Seguin committed
766
        i_log = 16;
767 768 769
    }
    if (i & 0xff00ff00)
    {
Vincent Seguin's avatar
Vincent Seguin committed
770
        i_log += 8;
771 772 773
    }
    if (i & 0xf0f0f0f0)
    {
Vincent Seguin's avatar
Vincent Seguin committed
774
        i_log += 4;
775 776 777
    }
    if (i & 0xcccccccc)
    {
Vincent Seguin's avatar
Vincent Seguin committed
778
        i_log += 2;
779 780 781
    }
    if (i & 0xaaaaaaaa)
    {
Vincent Seguin's avatar
Vincent Seguin committed
782
        i_log++;
783
    }
Vincent Seguin's avatar
Vincent Seguin committed
784
    if (i != ((u32)1 << i_log))
785 786 787
    {
	intf_ErrMsg("internal error: binary log overflow\n");
    }
Vincent Seguin's avatar
Vincent Seguin committed
788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813

    return( i_log );
}

/*****************************************************************************
 * MaskToShift: transform a color mask into right and left shifts
 *****************************************************************************
 * This function is used for obtaining color shifts from masks.
 *****************************************************************************/
static void MaskToShift( int *pi_left, int *pi_right, u32 i_mask )
{
    u32 i_low, i_high;                 /* lower hand higher bits of the mask */

    /* Get bits */
    i_low =  i_mask & (- i_mask);                   /* lower bit of the mask */
    i_high = i_mask + i_low;                       /* higher bit of the mask */

    /* Transform bits into an index */
    i_low =  BinaryLog (i_low);
    i_high = BinaryLog (i_high);

    /* Update pointers and return */
    *pi_left =   i_low;
    *pi_right = (8 - i_high + i_low);
}

814
/*****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
815
 * InitThread: initialize video output thread
816
 *****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
817 818 819
 * This function is called from RunThread and performs the second step of the
 * initialization. It returns 0 on success. Note that the thread's flag are not
 * modified inside this function.
820
 *****************************************************************************/
Michel Kaempf's avatar
Michel Kaempf committed
821 822 823
static int InitThread( vout_thread_t *p_vout )
{
    /* Update status */
824
    intf_DbgMsg("\n");
825
    *p_vout->pi_status = THREAD_START;
Michel Kaempf's avatar
Michel Kaempf committed
826

827
   /* Initialize output method - this function issues its own error messages */
828
    if( vout_SysInit( p_vout ) )
Michel Kaempf's avatar
Michel Kaempf committed
829 830
    {
        return( 1 );
831
    }
Michel Kaempf's avatar
Michel Kaempf committed
832

833
    /* Initialize convertion tables and functions */
834
    if( vout_InitYUV( p_vout ) )
835
    {
836
        intf_ErrMsg("error: can't allocate YUV translation tables\n");
837
        return( 1 );
Vincent Seguin's avatar
Vincent Seguin committed
838
    }
839

Michel Kaempf's avatar
Michel Kaempf committed
840
    /* Mark thread as running and return */
841 842 843 844
    p_vout->b_active =          1;
    *p_vout->pi_status =        THREAD_READY;
    intf_DbgMsg("thread ready\n");
    return( 0 );
Michel Kaempf's avatar
Michel Kaempf committed
845 846
}

847
/*****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
848
 * RunThread: video output thread
849
 *****************************************************************************
Michel Kaempf's avatar
Michel Kaempf committed
850 851 852
 * Video output thread. This function does only returns when the thread is
 * terminated. It handles the pictures arriving in the video heap and the
 * display device events.
853
 *****************************************************************************/
Michel Kaempf's avatar
Michel Kaempf committed
854 855
static void RunThread( vout_thread_t *p_vout)
{
856 857 858 859 860 861 862 863
    int             i_index;                                /* index in heap */
    mtime_t         current_date;                            /* current date */
    mtime_t         display_date;                            /* display date */
    boolean_t       b_display;                               /* display flag */
    picture_t *     p_pic;                                /* picture pointer */
    subpicture_t *  p_subpic;                          /* subpicture pointer */

    /*
864
     * Initialize thread
Michel Kaempf's avatar
Michel Kaempf committed
865 866 867 868
     */
    p_vout->b_error = InitThread( p_vout );
    if( p_vout->b_error )
    {
869
        DestroyThread( p_vout, THREAD_ERROR );
870 871
        return;
    }
872
    intf_DbgMsg("\n");
Michel Kaempf's avatar
Michel Kaempf committed
873 874 875 876 877 878

    /*
     * Main loop - it is not executed if an error occured during
     * initialization
     */
    while( (!p_vout->b_die) && (!p_vout->b_error) )
879 880 881
    {
        /* Initialize loop variables */
        p_pic =         NULL;
882
        p_subpic =      NULL;
883
        display_date =  0;
884 885
        current_date =  mdate();

886
        /*
887
	 * Find the picture to display - this operation does not need lock,
888
         * since only READY_PICTUREs are handled
889
         */
890
        for( i_index = 0; i_index < VOUT_MAX_PICTURES; i_index++ )
Vincent Seguin's avatar
Vincent Seguin committed
891
	{
892
	    if( (p_vout->p_picture[i_index].i_status == READY_PICTURE) &&
893
		( (p_pic == NULL) ||
894
		  (p_vout->p_picture[i_index].date < display_date) ) )
Vincent Seguin's avatar
Vincent Seguin committed
895
	    {
896
                p_pic = &p_vout->p_picture[i_index];
897
                display_date = p_pic->date;
Vincent Seguin's avatar
Vincent Seguin committed
898 899
	    }
	}
900

Vincent Seguin's avatar
Vincent Seguin committed
901
        if( p_pic )
Michel Kaempf's avatar
Michel Kaempf committed
902
        {
903 904
#ifdef STATS
            /* Computes FPS rate */
905
            p_vout->p_fps_sample[ p_vout->c_fps_samples++ % VOUT_FPS_SAMPLES ] = display_date;
906
#endif	
907
	    if( display_date < current_date )
Vincent Seguin's avatar
Vincent Seguin committed
908
	    {
909 910
		/* Picture is late: it will be destroyed and the thread will sleep and
                 * go to next picture */
Vincent Seguin's avatar
Vincent Seguin committed
911
                vlc_mutex_lock( &p_vout->picture_lock );
912
                p_pic->i_status = p_pic->i_refcount ? DISPLAYED_PICTURE : DESTROYED_PICTURE;
913 914
		intf_DbgMsg( "warning: late picture %p skipped refcount=%d\n", p_pic, p_pic->i_refcount );
                vlc_mutex_unlock( &p_vout->picture_lock );
915 916
                p_pic =         NULL;
                display_date =  0;
Vincent Seguin's avatar
Vincent Seguin committed
917
	    }
918
	    else if( display_date > current_date + VOUT_DISPLAY_DELAY )
Vincent Seguin's avatar
Vincent Seguin committed
919 920 921 922
	    {
		/* A picture is ready to be rendered, but its rendering date is
		 * far from the current one so the thread will perform an empty loop
		 * as if no picture were found. The picture state is unchanged */