vout_subpictures.c 10.8 KB
Newer Older
Sam Hocevar's avatar
 
Sam Hocevar committed
1 2 3 4
/*****************************************************************************
 * vout_subpictures.c : subpicture management functions
 *****************************************************************************
 * Copyright (C) 2000 VideoLAN
5
 * $Id: vout_subpictures.c,v 1.21 2003/07/15 18:12:05 sigmunau Exp $
Sam Hocevar's avatar
 
Sam Hocevar committed
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
 *
 * Authors: Vincent Seguin <seguin@via.ecp.fr>
 *          Samuel Hocevar <sam@zoy.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>                                                /* free() */
#include <stdio.h>                                              /* sprintf() */
#include <string.h>                                            /* strerror() */

32
#include <vlc/vlc.h>
Sam Hocevar's avatar
 
Sam Hocevar committed
33

34
#include "vlc_video.h"
Sam Hocevar's avatar
 
Sam Hocevar committed
35 36
#include "video_output.h"

37 38 39
/**
 * Display a subpicture unit
 *
Sam Hocevar's avatar
 
Sam Hocevar committed
40 41
 * Remove the reservation flag of a subpicture, which will cause it to be
 * ready for display.
42 43 44
 * \param p_vout the video output this subpicture should be displayed on
 * \param p_subpic the subpicture to display
 */
Sam Hocevar's avatar
 
Sam Hocevar committed
45 46
void  vout_DisplaySubPicture( vout_thread_t *p_vout, subpicture_t *p_subpic )
{
Sam Hocevar's avatar
 
Sam Hocevar committed
47
    int         i_margin;
Sam Hocevar's avatar
 
Sam Hocevar committed
48 49 50 51

    /* Check if status is valid */
    if( p_subpic->i_status != RESERVED_SUBPICTURE )
    {
52 53
        msg_Err( p_vout, "subpicture %p has invalid status #%d",
                         p_subpic, p_subpic->i_status );
Sam Hocevar's avatar
 
Sam Hocevar committed
54 55
    }

Sam Hocevar's avatar
 
Sam Hocevar committed
56 57
    /* If the user requested an SPU margin, we force the position after
     * having checked that it was a valid value. */
58
    i_margin = config_GetInt( p_vout, "spumargin" );
Sam Hocevar's avatar
 
Sam Hocevar committed
59 60 61

    if( i_margin >= 0 )
    {
62 63
        if( p_subpic->i_height + (unsigned int)i_margin
                                                 <= p_vout->output.i_height )
Sam Hocevar's avatar
 
Sam Hocevar committed
64 65 66 67 68 69
        {
            p_subpic->i_y = p_vout->output.i_height
                             - i_margin - p_subpic->i_height;
        }
    }

Sam Hocevar's avatar
 
Sam Hocevar committed
70 71 72 73
    /* Remove reservation flag */
    p_subpic->i_status = READY_SUBPICTURE;
}

74 75 76
/**
 * Allocate a subpicture in the video output heap.
 *
Sam Hocevar's avatar
 
Sam Hocevar committed
77 78 79 80
 * This function create a reserved subpicture in the video output heap.
 * A null pointer is returned if the function fails. This method provides an
 * already allocated zone of memory in the spu data fields. It needs locking
 * since several pictures can be created by several producers threads.
81 82 83 84
 * \param p_vout the vout in which to create the subpicture
 * \param i_type the type of the subpicture
 * \return NULL on error, a reserved subpicture otherwise
 */
85
subpicture_t *vout_CreateSubPicture( vout_thread_t *p_vout, int i_type )
Sam Hocevar's avatar
 
Sam Hocevar committed
86 87
{
    int                 i_subpic;                        /* subpicture index */
88
    subpicture_t *      p_subpic = NULL;            /* first free subpicture */
Sam Hocevar's avatar
 
Sam Hocevar committed
89 90 91 92 93 94 95 96 97

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

    /*
     * Look for an empty place
     */
    for( i_subpic = 0; i_subpic < VOUT_MAX_SUBPICTURES; i_subpic++ )
    {
98
        if( p_vout->p_subpicture[i_subpic].i_status == FREE_SUBPICTURE )
Sam Hocevar's avatar
 
Sam Hocevar committed
99 100
        {
            /* Subpicture is empty and ready for allocation */
101 102 103
            p_subpic = &p_vout->p_subpicture[i_subpic];
            p_vout->p_subpicture[i_subpic].i_status = RESERVED_SUBPICTURE;
            break;
Sam Hocevar's avatar
 
Sam Hocevar committed
104 105 106
        }
    }

107 108
    /* If no free subpicture could be found */
    if( p_subpic == NULL )
Sam Hocevar's avatar
 
Sam Hocevar committed
109
    {
110
        msg_Err( p_vout, "subpicture heap is full" );
Sam Hocevar's avatar
 
Sam Hocevar committed
111
        vlc_mutex_unlock( &p_vout->subpicture_lock );
112
        return NULL;
Sam Hocevar's avatar
 
Sam Hocevar committed
113
    }
Sam Hocevar's avatar
 
Sam Hocevar committed
114

115 116 117
    /* Copy subpicture information, set some default values */
    p_subpic->i_type    = i_type;
    p_subpic->i_status  = RESERVED_SUBPICTURE;
Sam Hocevar's avatar
 
Sam Hocevar committed
118

119 120 121 122 123 124 125 126
    p_subpic->i_start   = 0;
    p_subpic->i_stop    = 0;
    p_subpic->b_ephemer = VLC_FALSE;

    p_subpic->i_x       = 0;
    p_subpic->i_y       = 0;
    p_subpic->i_width   = 0;
    p_subpic->i_height  = 0;
Sam Hocevar's avatar
 
Sam Hocevar committed
127 128

    vlc_mutex_unlock( &p_vout->subpicture_lock );
Sam Hocevar's avatar
 
Sam Hocevar committed
129

130
    return p_subpic;
Sam Hocevar's avatar
 
Sam Hocevar committed
131 132
}

133 134 135
/**
 * Remove a subpicture from the heap
 *
Sam Hocevar's avatar
 
Sam Hocevar committed
136 137 138 139
 * This function frees a previously reserved subpicture.
 * It is meant to be used when the construction of a picture aborted.
 * This function does not need locking since reserved subpictures are ignored
 * by the output thread.
140
 */
Sam Hocevar's avatar
 
Sam Hocevar committed
141 142
void vout_DestroySubPicture( vout_thread_t *p_vout, subpicture_t *p_subpic )
{
Gildas Bazin's avatar
 
Gildas Bazin committed
143 144 145 146 147 148 149 150 151 152
    /* Get lock */
    vlc_mutex_lock( &p_vout->subpicture_lock );

    /* There can be race conditions so we need to check the status */
    if( p_subpic->i_status == FREE_SUBPICTURE )
    {
        vlc_mutex_unlock( &p_vout->subpicture_lock );
        return;
    }

153 154 155 156 157 158 159 160 161 162 163 164 165 166
    /* Check if status is valid */
    if( ( p_subpic->i_status != RESERVED_SUBPICTURE )
           && ( p_subpic->i_status != READY_SUBPICTURE ) )
    {
        msg_Err( p_vout, "subpicture %p has invalid status %d",
                         p_subpic, p_subpic->i_status );
    }

    if( p_subpic->pf_destroy )
    {
        p_subpic->pf_destroy( p_subpic );
    }

    p_subpic->i_status = FREE_SUBPICTURE;
Gildas Bazin's avatar
 
Gildas Bazin committed
167 168

    vlc_mutex_unlock( &p_vout->subpicture_lock );
Sam Hocevar's avatar
 
Sam Hocevar committed
169 170 171 172 173
}

/*****************************************************************************
 * vout_RenderSubPictures: render a subpicture list
 *****************************************************************************
Sam Hocevar's avatar
 
Sam Hocevar committed
174
 * This function renders all sub picture units in the list.
Sam Hocevar's avatar
 
Sam Hocevar committed
175
 *****************************************************************************/
Sam Hocevar's avatar
 
Sam Hocevar committed
176 177
void vout_RenderSubPictures( vout_thread_t *p_vout, picture_t *p_pic,
                             subpicture_t *p_subpic )
Sam Hocevar's avatar
 
Sam Hocevar committed
178
{
Gildas Bazin's avatar
 
Gildas Bazin committed
179 180 181 182 183
    /* Get lock */
    vlc_mutex_lock( &p_vout->subpicture_lock );

    /* Check i_status again to make sure spudec hasn't destroyed the subpic */
    while( p_subpic != NULL && p_subpic->i_status != FREE_SUBPICTURE )
Sam Hocevar's avatar
 
Sam Hocevar committed
184
    {
Sam Hocevar's avatar
 
Sam Hocevar committed
185
        p_subpic->pf_render( p_vout, p_pic, p_subpic );
Sam Hocevar's avatar
 
Sam Hocevar committed
186 187
        p_subpic = p_subpic->p_next;
    }
Gildas Bazin's avatar
 
Gildas Bazin committed
188 189

    vlc_mutex_unlock( &p_vout->subpicture_lock );
Sam Hocevar's avatar
 
Sam Hocevar committed
190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217
}

/*****************************************************************************
 * vout_SortSubPictures: find the subpictures to display
 *****************************************************************************
 * This function parses all subpictures and decides which ones need to be
 * displayed. This operation does not need lock, since only READY_SUBPICTURE
 * are handled. If no picture has been selected, display_date will depend on
 * the subpicture.
 * We also check for ephemer DVD subpictures (subpictures that have
 * to be removed if a newer one is available), which makes it a lot
 * more difficult to guess if a subpicture has to be rendered or not.
 *****************************************************************************/
subpicture_t *vout_SortSubPictures( vout_thread_t *p_vout,
                                    mtime_t display_date )
{
    int i_index;
    subpicture_t *p_subpic     = NULL;
    subpicture_t *p_ephemer    = NULL;
    mtime_t       ephemer_date = 0;

    /* We get an easily parsable chained list of subpictures which
     * ends with NULL since p_subpic was initialized to NULL. */
    for( i_index = 0; i_index < VOUT_MAX_SUBPICTURES; i_index++ )
    {
        if( p_vout->p_subpicture[i_index].i_status == READY_SUBPICTURE )
        {
            /* If it is a DVD subpicture, check its date */
Sam Hocevar's avatar
 
Sam Hocevar committed
218
            if( p_vout->p_subpicture[i_index].i_type == MEMORY_SUBPICTURE )
Sam Hocevar's avatar
 
Sam Hocevar committed
219
            {
220 221
                if( !p_vout->p_subpicture[i_index].b_ephemer
                     && display_date > p_vout->p_subpicture[i_index].i_stop )
Sam Hocevar's avatar
 
Sam Hocevar committed
222 223 224 225 226 227 228
                {
                    /* Too late, destroy the subpic */
                    vout_DestroySubPicture( p_vout,
                                    &p_vout->p_subpicture[i_index] );
                    continue;
                }

229 230
                if( display_date
                     && display_date < p_vout->p_subpicture[i_index].i_start )
Sam Hocevar's avatar
 
Sam Hocevar committed
231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303
                {
                    /* Too early, come back next monday */
                    continue;
                }

                /* If this is an ephemer subpic, see if it's the
                 * youngest we have */
                if( p_vout->p_subpicture[i_index].b_ephemer )
                {
                    if( p_ephemer == NULL )
                    {
                        p_ephemer = &p_vout->p_subpicture[i_index];
                        continue;
                    }

                    if( p_vout->p_subpicture[i_index].i_start
                                                     < p_ephemer->i_start )
                    {
                        /* Link the previous ephemer subpicture and
                         * replace it with the current one */
                        p_ephemer->p_next = p_subpic;
                        p_subpic = p_ephemer;
                        p_ephemer = &p_vout->p_subpicture[i_index];

                        /* If it's the 2nd youngest subpicture,
                         * register its date */
                        if( !ephemer_date
                              || ephemer_date > p_subpic->i_start )
                        {
                            ephemer_date = p_subpic->i_start;
                        }

                        continue;
                    }
                }

                p_vout->p_subpicture[i_index].p_next = p_subpic;
                p_subpic = &p_vout->p_subpicture[i_index];

                /* If it's the 2nd youngest subpicture, register its date */                    if( !ephemer_date || ephemer_date > p_subpic->i_start )
                {
                    ephemer_date = p_subpic->i_start;
                }
            }
            /* If it's not a DVD subpicture, just register it */
            else
            {
                p_vout->p_subpicture[i_index].p_next = p_subpic;
                p_subpic = &p_vout->p_subpicture[i_index];
            }
        }
    }

    /* If we found an ephemer subpicture, check if it has to be
     * displayed */
    if( p_ephemer != NULL )
    {
        if( p_ephemer->i_start < ephemer_date )
        {
            /* Ephemer subpicture has lived too long */
            vout_DestroySubPicture( p_vout, p_ephemer );
        }
        else
        {
            /* Ephemer subpicture can still live a bit */
            p_ephemer->p_next = p_subpic;
            return p_ephemer;
        }
    }

    return p_subpic;
}