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 1.5 2001/12/30 07:09:56 sam 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 <string.h>                                    /* memcpy(), memset() */
  28 #include <stdlib.h>                                             /* realloc() */
  29
  30 #include <videolan/vlc.h>
  31
  32 #include "video.h"
  33 #include "video_output.h"
  34
  35 #include "stream_control.h"
  36 #include "input_ext-dec.h"
  37
  38 #include "vdec_ext-plugins.h"
  39 #include "vpar_pool.h"
  40 #include "video_parser.h"
  41 #include "video_decoder.h"
  42
  43 /*
  44  * Local prototypes
  45  */
  46 static void WaitDummy( vdec_pool_t * p_pool );
  47 static void WaitPool( vdec_pool_t * p_pool );
  48 static void FreeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb );
  49 static void FreeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb );
  50 static macroblock_t * NewMacroblockDummy( vdec_pool_t * p_pool );
  51 static macroblock_t * NewMacroblockPool( vdec_pool_t * p_pool );
  52 static void DecodeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb );
  53 static void DecodeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb );
  54
  55 /*****************************************************************************
  56  * vpar_InitPool: Initializes the pool structure
  57  *****************************************************************************/
  58 void vpar_InitPool( vpar_thread_t * p_vpar )
  59 {
  60     int j;
  61
  62     /* Initialize mutex and cond. */
  63     vlc_mutex_init( &p_vpar->pool.lock );
  64     vlc_cond_init( &p_vpar->pool.wait_empty );
  65     vlc_cond_init( &p_vpar->pool.wait_undecoded );
  66
  67     /* Spawn optional video decoder threads. */
  68     p_vpar->pool.i_smp = 0;
  69     p_vpar->pool.pp_vdec = NULL;
  70     p_vpar->pool.p_macroblocks = NULL;
  71     p_vpar->pool.pp_empty_macroblocks = NULL;
  72     p_vpar->pool.pp_new_macroblocks = NULL;
  73     p_vpar->pool.p_vpar = p_vpar;
  74     vpar_SpawnPool( p_vpar );
  75
  76     /* Initialize fake video decoder structure (used when
  77      * decoder == parser). */
  78     if ( (p_vpar->pool.p_vdec =
  79                 (vdec_thread_t *)malloc( sizeof(vdec_thread_t) )) == NULL )
  80     {
  81         intf_ErrMsg("vdec error: not enough memory for vdec_CreateThread() to create the new thread");
  82         p_vpar->p_fifo->b_error = 1;
  83         return;
  84     }
  85     p_vpar->pool.p_vdec->b_die = 0;
  86     p_vpar->pool.p_vdec->p_pool = &p_vpar->pool;
  87     vdec_InitThread( p_vpar->pool.p_vdec );
  88
  89     for( j = 0; j < 12; j++ )
  90     {
  91         p_vpar->pool.mb.p_idcts[j].pi_block =
  92         memalign( 16, 64 * sizeof(dctelem_t) );
  93     }
  94 }
  95
  96 /*****************************************************************************
  97  * vpar_SpawnPool: Create and cancel video decoder threads at any time
  98  *****************************************************************************
  99  * This function is called on startup, and everytime the user changes the
 100  * number of threads to launch. Please note that *all* decoder threads must
 101  * be idle during this operation, which only happens at the end of
 102  * PictureHeader().
 103  *****************************************************************************/
 104 void vpar_SpawnPool( vpar_thread_t * p_vpar )
 105 {
 106     int                 i_new_smp;
 107     stream_ctrl_t *     p_control;
 108
 109     p_control = p_vpar->p_config->p_stream_ctrl;
 110     vlc_mutex_lock( &p_control->control_lock );
 111     i_new_smp = p_control->i_smp;
 112     vlc_mutex_unlock( &p_control->control_lock );
 113
 114     /* FIXME: No error check because I'm tired. Come back later... */
 115
 116     /* No need to lock p_vpar->pool, since decoders MUST be idle here. */
 117     if( p_vpar->pool.i_smp != i_new_smp )
 118     {
 119         int i;
 120
 121         if( p_vpar->pool.i_smp > i_new_smp )
 122         {
 123             /* The user reduces the number of threads. */
 124
 125             for( i = p_vpar->pool.i_smp - 1; i >= i_new_smp; i-- )
 126             {
 127                 int j;
 128
 129                 vdec_DestroyThread( p_vpar->pool.pp_vdec[i] );
 130
 131                 for( j = 0; j < 12; j++ )
 132                 {
 133                     free( p_vpar->pool.p_macroblocks[i].p_idcts[j].pi_block );
 134                 }
 135             }
 136
 137             p_vpar->pool.pp_vdec = realloc( p_vpar->pool.pp_vdec,
 138                                             i_new_smp * sizeof(vdec_thread_t *) );
 139             p_vpar->pool.p_macroblocks = realloc( p_vpar->pool.p_macroblocks,
 140                                             i_new_smp * sizeof(macroblock_t) );
 141             p_vpar->pool.pp_empty_macroblocks = realloc( p_vpar->pool.pp_empty_macroblocks,
 142                                             i_new_smp * sizeof(macroblock_t *) );
 143             p_vpar->pool.i_index_empty = i_new_smp;
 144             p_vpar->pool.pp_new_macroblocks = realloc( p_vpar->pool.pp_new_macroblocks,
 145                                             i_new_smp * sizeof(macroblock_t *) );
 146             p_vpar->pool.i_index_new = 0;
 147         }
 148         else
 149         {
 150             /* The user raises the number of threads. */
 151
 152             p_vpar->pool.pp_vdec = realloc( p_vpar->pool.pp_vdec,
 153                                             i_new_smp * sizeof(vdec_thread_t *) );
 154             p_vpar->pool.p_macroblocks = realloc( p_vpar->pool.p_macroblocks,
 155                                             i_new_smp * sizeof(macroblock_t) );
 156             p_vpar->pool.pp_empty_macroblocks = realloc( p_vpar->pool.pp_empty_macroblocks,
 157                                             i_new_smp * sizeof(macroblock_t *) );
 158             p_vpar->pool.i_index_empty = i_new_smp;
 159             p_vpar->pool.pp_new_macroblocks = realloc( p_vpar->pool.pp_new_macroblocks,
 160                                             i_new_smp * sizeof(macroblock_t *) );
 161             p_vpar->pool.i_index_new = 0;
 162
 163             for( i = p_vpar->pool.i_smp; i < i_new_smp ; i++ )
 164             {
 165                 int j;
 166
 167                 for( j = 0; j < 12; j++ )
 168                 {
 169                     p_vpar->pool.p_macroblocks[i].p_idcts[j].pi_block =
 170                         memalign( 16, 64 * sizeof(dctelem_t) );
 171                 }
 172
 173                 p_vpar->pool.pp_vdec[i] = vdec_CreateThread( &p_vpar->pool );
 174             }
 175
 176         }
 177         for( i = 0; i < i_new_smp; i++ )
 178         {
 179             p_vpar->pool.pp_empty_macroblocks[i] =
 180                                     &p_vpar->pool.p_macroblocks[i];
 181         }
 182         p_vpar->pool.i_smp = i_new_smp;
 183     }
 184
 185     if( i_new_smp )
 186     {
 187         /* We have at least one decoder thread. */
 188         p_vpar->pool.pf_wait_pool = WaitPool;
 189         p_vpar->pool.pf_new_mb = NewMacroblockPool;
 190         p_vpar->pool.pf_free_mb = FreeMacroblockPool;
 191         p_vpar->pool.pf_decode_mb = DecodeMacroblockPool;
 192     }
 193     else
 194     {
 195         /* No decoder pool. */
 196         p_vpar->pool.pf_wait_pool = WaitDummy;
 197         p_vpar->pool.pf_new_mb = NewMacroblockDummy;
 198         p_vpar->pool.pf_free_mb = FreeMacroblockDummy;
 199         p_vpar->pool.pf_decode_mb = DecodeMacroblockDummy;
 200     }
 201 }
 202
 203 /*****************************************************************************
 204  * vpar_EndPool: Releases the pool structure
 205  *****************************************************************************/
 206 void vpar_EndPool( vpar_thread_t * p_vpar )
 207 {
 208     int i;
 209
 210     for( i = 0; i < p_vpar->pool.i_smp; i++ )
 211     {
 212         int j;
 213
 214         vdec_DestroyThread( p_vpar->pool.pp_vdec[i] );
 215
 216         for( j = 0; j < 12; j++ )
 217         {
 218             free( p_vpar->pool.p_macroblocks[i].p_idcts[j].pi_block );
 219         }
 220     }
 221
 222     if( p_vpar->pool.i_smp )
 223     {
 224         free( p_vpar->pool.pp_vdec );
 225         free( p_vpar->pool.p_macroblocks );
 226         free( p_vpar->pool.pp_new_macroblocks );
 227     }
 228
 229     /* Free fake video decoder (used when parser == decoder). */
 230     vdec_EndThread( p_vpar->pool.p_vdec );
 231
 232     /* Destroy lock and cond. */
 233     vlc_mutex_destroy( &p_vpar->pool.lock );
 234     vlc_cond_destroy( &p_vpar->pool.wait_empty );
 235     vlc_cond_destroy( &p_vpar->pool.wait_undecoded );
 236 }
 237
 238 /*****************************************************************************
 239  * WaitPool: Wait until all decoders are idle
 240  *****************************************************************************/
 241 static void WaitPool( vdec_pool_t * p_pool )
 242 {
 243     vlc_mutex_lock( &p_pool->lock );
 244     while( p_pool->i_index_empty != p_pool->i_smp )
 245     {
 246         vlc_cond_wait( &p_pool->wait_empty, &p_pool->lock );
 247     }
 248     vlc_mutex_unlock( &p_pool->lock );
 249 }
 250
 251 /*****************************************************************************
 252  * WaitDummy: Placeholder used when parser == decoder
 253  *****************************************************************************/
 254 static void WaitDummy( vdec_pool_t * p_pool )
 255 {
 256 }
 257
 258 /*****************************************************************************
 259  * NewMacroblockPool: Get an empty macroblock from the decoder pool
 260  *****************************************************************************/
 261 static macroblock_t * NewMacroblockPool( vdec_pool_t * p_pool )
 262 {
 263     macroblock_t *  p_mb;
 264
 265     vlc_mutex_lock( &p_pool->lock );
 266     while( p_pool->i_index_empty == 0 )
 267     {
 268         vlc_cond_wait( &p_pool->wait_empty, &p_pool->lock );
 269     }
 270     p_mb = p_pool->pp_empty_macroblocks[ --p_pool->i_index_empty ];
 271     vlc_mutex_unlock( &p_pool->lock );
 272     return( p_mb );
 273 }
 274
 275 /*****************************************************************************
 276  * NewMacroblockDummy: Placeholder used when parser == decoder
 277  *****************************************************************************/
 278 static macroblock_t * NewMacroblockDummy( vdec_pool_t * p_pool )
 279 {
 280     return( &p_pool->mb );
 281 }
 282
 283 /*****************************************************************************
 284  * FreeMacroblockPool: Free a macroblock
 285  *****************************************************************************/
 286 static void FreeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb )
 287 {
 288     vlc_mutex_lock( &p_pool->lock );
 289     p_pool->pp_empty_macroblocks[ p_pool->i_index_empty++ ] = p_mb;
 290     vlc_cond_signal( &p_pool->wait_empty );
 291     vlc_mutex_unlock( &p_pool->lock );
 292 }
 293
 294 /*****************************************************************************
 295  * FreeMacroblockDummy: Placeholder used when parser == decoder
 296  *****************************************************************************/
 297 static void FreeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb )
 298 {
 299 }
 300
 301 /*****************************************************************************
 302  * DecodeMacroblockPool: Send a macroblock to a vdec thread
 303  *****************************************************************************/
 304 static void DecodeMacroblockPool( vdec_pool_t * p_pool, macroblock_t * p_mb )
 305 {
 306     vlc_mutex_lock( &p_pool->lock );
 307     /* The undecoded macroblock LIFO cannot be full, because
 308      * #macroblocks == size of the LIFO */
 309     p_pool->pp_new_macroblocks[ p_pool->i_index_new++ ] = p_mb;
 310     vlc_cond_signal( &p_pool->wait_undecoded );
 311     vlc_mutex_unlock( &p_pool->lock );
 312 }
 313
 314 /*****************************************************************************
 315  * DecodeMacroblockDummy: Placeholder used when parser == decoder
 316  *****************************************************************************/
 317 static void DecodeMacroblockDummy( vdec_pool_t * p_pool, macroblock_t * p_mb )
 318 {
 319     p_pool->pf_vdec_decode( p_pool->p_vdec, p_mb );
 320 }
 321