git.sesse.net Git - vlc/blob - plugins/mpeg_vdec/vpar_pool.c

   1 /*****************************************************************************
   2  * vpar_pool.c : management of the pool of decoder threads
   3  *****************************************************************************
   4  * Copyright (C) 2001 VideoLAN
   5  * $Id: vpar_pool.c,v 1.2 2001/11/28 15:08:05 massiot Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  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 General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #include "defs.h"
  28
  29 #include <string.h>                                    /* memcpy(), memset() */
  30 #include <stdlib.h>                                             /* realloc() */
  31
  32 #include "config.h"
  33 #include "common.h"
  34 #include "intf_msg.h"
  35 #include "threads.h"
  36 #include "mtime.h"
  37
  38 #include "video.h"
  39 #include "video_output.h"
  40
  41 #include "modules_export.h"
  42 #include "stream_control.h"
  43 #include "input_ext-dec.h"
  44
  45
  46 #include "vdec_ext-plugins.h"
  47 #include "vpar_pool.h"
  48 #include "video_parser.h"
  49 #include "video_decoder.h"
  50
  51 /*
  52  * Local prototypes
  53  */
  54 static void WaitDummy( vdec_pool_t * p_pool );
  55 static void WaitPool( vdec_pool_t * p_pool );
  56 static void FreeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb );
  57 static void FreeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb );
  58 static macroblock_t * NewMacroblockDummy( vdec_pool_t * p_pool );
  59 static macroblock_t * NewMacroblockPool( vdec_pool_t * p_pool );
  60 static void DecodeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb );
  61 static void DecodeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb );
  62
  63 /*****************************************************************************
  64  * vpar_InitPool: Initializes the pool structure
  65  *****************************************************************************/
  66 void vpar_InitPool( vpar_thread_t * p_vpar )
  67 {
  68     int j;
  69
  70     /* Initialize mutex and cond. */
  71     vlc_mutex_init( &p_vpar->pool.lock );
  72     vlc_cond_init( &p_vpar->pool.wait_empty );
  73     vlc_cond_init( &p_vpar->pool.wait_undecoded );
  74
  75     /* Spawn optional video decoder threads. */
  76     p_vpar->pool.i_smp = 0;
  77     p_vpar->pool.pp_vdec = NULL;
  78     p_vpar->pool.p_macroblocks = NULL;
  79     p_vpar->pool.pp_empty_macroblocks = NULL;
  80     p_vpar->pool.pp_new_macroblocks = NULL;
  81     p_vpar->pool.p_vpar = p_vpar;
  82     vpar_SpawnPool( p_vpar );
  83
  84     /* Initialize fake video decoder structure (used when
  85      * decoder == parser). */
  86     if ( (p_vpar->pool.p_vdec =
  87                 (vdec_thread_t *)malloc( sizeof(vdec_thread_t) )) == NULL )
  88     {
  89         intf_ErrMsg("vdec error: not enough memory for vdec_CreateThread() to create the new thread");
  90         p_vpar->p_fifo->b_error = 1;
  91         return;
  92     }
  93     p_vpar->pool.p_vdec->b_die = 0;
  94     p_vpar->pool.p_vdec->p_pool = &p_vpar->pool;
  95     vdec_InitThread( p_vpar->pool.p_vdec );
  96
  97     for( j = 0; j < 12; j++ )
  98     {
  99         p_vpar->pool.mb.p_idcts[j].pi_block =
 100         memalign( 16, 64 * sizeof(dctelem_t) );
 101     }
 102 }
 103
 104 /*****************************************************************************
 105  * vpar_SpawnPool: Create and cancel video decoder threads at any time
 106  *****************************************************************************
 107  * This function is called on startup, and everytime the user changes the
 108  * number of threads to launch. Please note that *all* decoder threads must
 109  * be idle during this operation, which only happens at the end of
 110  * PictureHeader().
 111  *****************************************************************************/
 112 void vpar_SpawnPool( vpar_thread_t * p_vpar )
 113 {
 114     int                 i_new_smp;
 115     stream_ctrl_t *     p_control;
 116
 117     p_control = p_vpar->p_config->p_stream_ctrl;
 118     vlc_mutex_lock( &p_control->control_lock );
 119     i_new_smp = p_control->i_smp;
 120     vlc_mutex_unlock( &p_control->control_lock );
 121
 122     /* FIXME: No error check because I'm tired. Come back later... */
 123
 124     /* No need to lock p_vpar->pool, since decoders MUST be idle here. */
 125     if( p_vpar->pool.i_smp != i_new_smp )
 126     {
 127         int i;
 128
 129         if( p_vpar->pool.i_smp > i_new_smp )
 130         {
 131             /* The user reduces the number of threads. */
 132
 133             for( i = p_vpar->pool.i_smp - 1; i >= i_new_smp; i-- )
 134             {
 135                 int j;
 136
 137                 vdec_DestroyThread( p_vpar->pool.pp_vdec[i] );
 138
 139                 for( j = 0; j < 12; j++ )
 140                 {
 141                     free( p_vpar->pool.p_macroblocks[i].p_idcts[j].pi_block );
 142                 }
 143             }
 144
 145             p_vpar->pool.pp_vdec = realloc( p_vpar->pool.pp_vdec,
 146                                             i_new_smp * sizeof(vdec_thread_t *) );
 147             p_vpar->pool.p_macroblocks = realloc( p_vpar->pool.p_macroblocks,
 148                                             i_new_smp * sizeof(macroblock_t) );
 149             p_vpar->pool.pp_empty_macroblocks = realloc( p_vpar->pool.pp_empty_macroblocks,
 150                                             i_new_smp * sizeof(macroblock_t *) );
 151             p_vpar->pool.i_index_empty = i_new_smp;
 152             p_vpar->pool.pp_new_macroblocks = realloc( p_vpar->pool.pp_new_macroblocks,
 153                                             i_new_smp * sizeof(macroblock_t *) );
 154             p_vpar->pool.i_index_new = 0;
 155         }
 156         else
 157         {
 158             /* The user raises the number of threads. */
 159
 160             p_vpar->pool.pp_vdec = realloc( p_vpar->pool.pp_vdec,
 161                                             i_new_smp * sizeof(vdec_thread_t *) );
 162             p_vpar->pool.p_macroblocks = realloc( p_vpar->pool.p_macroblocks,
 163                                             i_new_smp * sizeof(macroblock_t) );
 164             p_vpar->pool.pp_empty_macroblocks = realloc( p_vpar->pool.pp_empty_macroblocks,
 165                                             i_new_smp * sizeof(macroblock_t *) );
 166             p_vpar->pool.i_index_empty = i_new_smp;
 167             p_vpar->pool.pp_new_macroblocks = realloc( p_vpar->pool.pp_new_macroblocks,
 168                                             i_new_smp * sizeof(macroblock_t *) );
 169             p_vpar->pool.i_index_new = 0;
 170
 171             for( i = p_vpar->pool.i_smp; i < i_new_smp ; i++ )
 172             {
 173                 int j;
 174
 175                 for( j = 0; j < 12; j++ )
 176                 {
 177                     p_vpar->pool.p_macroblocks[i].p_idcts[j].pi_block =
 178                         memalign( 16, 64 * sizeof(dctelem_t) );
 179                 }
 180
 181                 p_vpar->pool.pp_vdec[i] = vdec_CreateThread( &p_vpar->pool );
 182             }
 183
 184         }
 185         for( i = 0; i < i_new_smp; i++ )
 186         {
 187             p_vpar->pool.pp_empty_macroblocks[i] =
 188                                     &p_vpar->pool.p_macroblocks[i];
 189         }
 190         p_vpar->pool.i_smp = i_new_smp;
 191     }
 192
 193     if( i_new_smp )
 194     {
 195         /* We have at least one decoder thread. */
 196         p_vpar->pool.pf_wait_pool = WaitPool;
 197         p_vpar->pool.pf_new_mb = NewMacroblockPool;
 198         p_vpar->pool.pf_free_mb = FreeMacroblockPool;
 199         p_vpar->pool.pf_decode_mb = DecodeMacroblockPool;
 200     }
 201     else
 202     {
 203         /* No decoder pool. */
 204         p_vpar->pool.pf_wait_pool = WaitDummy;
 205         p_vpar->pool.pf_new_mb = NewMacroblockDummy;
 206         p_vpar->pool.pf_free_mb = FreeMacroblockDummy;
 207         p_vpar->pool.pf_decode_mb = DecodeMacroblockDummy;
 208     }
 209 }
 210
 211 /*****************************************************************************
 212  * vpar_EndPool: Releases the pool structure
 213  *****************************************************************************/
 214 void vpar_EndPool( vpar_thread_t * p_vpar )
 215 {
 216     int i;
 217
 218     for( i = 0; i < p_vpar->pool.i_smp; i++ )
 219     {
 220         int j;
 221
 222         vdec_DestroyThread( p_vpar->pool.pp_vdec[i] );
 223
 224         for( j = 0; j < 12; j++ )
 225         {
 226             free( p_vpar->pool.p_macroblocks[i].p_idcts[j].pi_block );
 227         }
 228     }
 229
 230     if( p_vpar->pool.i_smp )
 231     {
 232         free( p_vpar->pool.pp_vdec );
 233         free( p_vpar->pool.p_macroblocks );
 234         free( p_vpar->pool.pp_new_macroblocks );
 235     }
 236
 237     /* Free fake video decoder (used when parser == decoder). */
 238     vdec_EndThread( p_vpar->pool.p_vdec );
 239
 240     /* Destroy lock and cond. */
 241     vlc_mutex_destroy( &p_vpar->pool.lock );
 242     vlc_cond_destroy( &p_vpar->pool.wait_empty );
 243     vlc_cond_destroy( &p_vpar->pool.wait_undecoded );
 244 }
 245
 246 /*****************************************************************************
 247  * WaitPool: Wait until all decoders are idle
 248  *****************************************************************************/
 249 static void WaitPool( vdec_pool_t * p_pool )
 250 {
 251     vlc_mutex_lock( &p_pool->lock );
 252     while( p_pool->i_index_empty != p_pool->i_smp )
 253     {
 254         vlc_cond_wait( &p_pool->wait_empty, &p_pool->lock );
 255     }
 256     vlc_mutex_unlock( &p_pool->lock );
 257 }
 258
 259 /*****************************************************************************
 260  * WaitDummy: Placeholder used when parser == decoder
 261  *****************************************************************************/
 262 static void WaitDummy( vdec_pool_t * p_pool )
 263 {
 264 }
 265
 266 /*****************************************************************************
 267  * NewMacroblockPool: Get an empty macroblock from the decoder pool
 268  *****************************************************************************/
 269 static macroblock_t * NewMacroblockPool( vdec_pool_t * p_pool )
 270 {
 271     macroblock_t *  p_mb;
 272
 273     vlc_mutex_lock( &p_pool->lock );
 274     while( p_pool->i_index_empty == 0 )
 275     {
 276         vlc_cond_wait( &p_pool->wait_empty, &p_pool->lock );
 277     }
 278     p_mb = p_pool->pp_empty_macroblocks[ --p_pool->i_index_empty ];
 279     vlc_mutex_unlock( &p_pool->lock );
 280     return( p_mb );
 281 }
 282
 283 /*****************************************************************************
 284  * NewMacroblockDummy: Placeholder used when parser == decoder
 285  *****************************************************************************/
 286 static macroblock_t * NewMacroblockDummy( vdec_pool_t * p_pool )
 287 {
 288     return( &p_pool->mb );
 289 }
 290
 291 /*****************************************************************************
 292  * FreeMacroblockPool: Free a macroblock
 293  *****************************************************************************/
 294 static void FreeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb )
 295 {
 296     vlc_mutex_lock( &p_pool->lock );
 297     p_pool->pp_empty_macroblocks[ p_pool->i_index_empty++ ] = p_mb;
 298     vlc_cond_signal( &p_pool->wait_empty );
 299     vlc_mutex_unlock( &p_pool->lock );
 300 }
 301
 302 /*****************************************************************************
 303  * FreeMacroblockDummy: Placeholder used when parser == decoder
 304  *****************************************************************************/
 305 static void FreeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb )
 306 {
 307 }
 308
 309 /*****************************************************************************
 310  * DecodeMacroblockPool: Send a macroblock to a vdec thread
 311  *****************************************************************************/
 312 static void DecodeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb )
 313 {
 314     vlc_mutex_lock( &p_pool->lock );
 315     /* The undecoded macroblock LIFO cannot be full, because
 316      * #macroblocks == size of the LIFO */
 317     p_pool->pp_new_macroblocks[ p_pool->i_index_new++ ] = p_mb;
 318     vlc_cond_signal( &p_pool->wait_undecoded );
 319     vlc_mutex_unlock( &p_pool->lock );
 320 }
 321
 322 /*****************************************************************************
 323  * DecodeMacroblockDummy: Placeholder used when parser == decoder
 324  *****************************************************************************/
 325 static void DecodeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb )
 326 {
 327     p_pool->pf_vdec_decode( p_pool->p_vdec, p_mb );
 328 }
 329