git.sesse.net Git - vlc/blob - src/video_decoder/video_decoder.c

   1 /*****************************************************************************
   2  * video_decoder.c : video decoder thread
   3  *****************************************************************************
   4  * Copyright (C) 1999, 2000 VideoLAN
   5  * $Id: video_decoder.c,v 1.58 2001/09/05 16:07:50 massiot Exp $
   6  *
   7  * Authors: Christophe Massiot <massiot@via.ecp.fr>
   8  *          Michel Lespinasse <walken@zoy.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include "defs.h"
  29
  30 #ifdef HAVE_UNISTD_H
  31 #include <unistd.h>                                              /* getpid() */
  32 #endif
  33
  34 #include <stdlib.h>                                                /* free() */
  35 #include <string.h>                                    /* memcpy(), memset() */
  36 #include <errno.h>                                                  /* errno */
  37
  38 #include "config.h"
  39 #include "common.h"
  40 #include "threads.h"
  41 #include "mtime.h"
  42
  43 #include "intf_msg.h"
  44
  45 #include "stream_control.h"
  46 #include "input_ext-dec.h"
  47
  48 #include "video.h"
  49 #include "video_output.h"
  50
  51 #include "vdec_ext-plugins.h"
  52 #include "video_decoder.h"
  53 #include "vpar_pool.h"
  54 #include "video_parser.h"
  55
  56 /*
  57  * Local prototypes
  58  */
  59 static void     RunThread           ( vdec_thread_t *p_vdec );
  60
  61 /*****************************************************************************
  62  * vdec_CreateThread: create a video decoder thread
  63  *****************************************************************************
  64  * This function creates a new video decoder thread, and returns a pointer
  65  * to its description. On error, it returns NULL.
  66  *****************************************************************************/
  67 vdec_thread_t * vdec_CreateThread( vdec_pool_t * p_pool )
  68 {
  69     vdec_thread_t *     p_vdec;
  70
  71     intf_DbgMsg("vdec debug: creating video decoder thread");
  72
  73     /* Allocate the memory needed to store the thread's structure */
  74     if ( (p_vdec = (vdec_thread_t *)malloc( sizeof(vdec_thread_t) )) == NULL )
  75     {
  76         intf_ErrMsg("vdec error: not enough memory for vdec_CreateThread() to create the new thread");
  77         return( NULL );
  78     }
  79
  80     /*
  81      * Initialize the thread properties
  82      */
  83     p_vdec->b_die = 0;
  84
  85     /*
  86      * Initialize the parser properties
  87      */
  88     p_vdec->p_pool = p_pool;
  89
  90     /* Spawn the video decoder thread */
  91     if ( vlc_thread_create(&p_vdec->thread_id, "video decoder",
  92          (vlc_thread_func_t)RunThread, (void *)p_vdec) )
  93     {
  94         intf_ErrMsg("vdec error: can't spawn video decoder thread");
  95         free( p_vdec );
  96         return( NULL );
  97     }
  98
  99     intf_DbgMsg("vdec debug: video decoder thread (%p) created", p_vdec);
 100     return( p_vdec );
 101 }
 102
 103 /*****************************************************************************
 104  * vdec_DestroyThread: destroy a video decoder thread
 105  *****************************************************************************/
 106 void vdec_DestroyThread( vdec_thread_t *p_vdec )
 107 {
 108     intf_DbgMsg("vdec debug: requesting termination of video decoder thread %p", p_vdec);
 109
 110     /* Ask thread to kill itself */
 111     p_vdec->b_die = 1;
 112
 113     /* Make sure the decoder thread leaves the vpar_GetMacroblock() function */
 114     vlc_mutex_lock( &p_vdec->p_pool->lock );
 115     vlc_cond_broadcast( &p_vdec->p_pool->wait_undecoded );
 116     vlc_mutex_unlock( &p_vdec->p_pool->lock );
 117
 118     /* Waiting for the decoder thread to exit */
 119     vlc_thread_join( p_vdec->thread_id );
 120 }
 121
 122 /* following functions are local */
 123
 124 /*****************************************************************************
 125  * vdec_InitThread: initialize video decoder thread
 126  *****************************************************************************
 127  * This function is called from RunThread and performs the second step of the
 128  * initialization.
 129  *****************************************************************************/
 130 void vdec_InitThread( vdec_thread_t * p_vdec )
 131 {
 132     intf_DbgMsg("vdec debug: initializing video decoder thread %p", p_vdec);
 133
 134 #if !defined(SYS_BEOS)
 135 #   if VDEC_NICE
 136     /* Re-nice ourself - otherwise we would steal CPU time from the video
 137      * output, which would make a poor display. */
 138 #       if !defined(WIN32)
 139     if( nice(VDEC_NICE) == -1 )
 140 #       else
 141     if( !SetThreadPriority( GetCurrentThread(),
 142                             THREAD_PRIORITY_BELOW_NORMAL ) )
 143 #       endif
 144     {
 145         intf_WarnMsg( 2, "vpar warning : couldn't nice() (%s)",
 146                       strerror(errno) );
 147     }
 148 #   endif
 149 #endif
 150
 151     p_vdec->p_idct_data = NULL;
 152
 153     p_vdec->p_pool->pf_idct_init( &p_vdec->p_idct_data );
 154
 155     /* Mark thread as running and return */
 156     intf_DbgMsg("vdec debug: InitThread(%p) succeeded", p_vdec);
 157 }
 158
 159 /*****************************************************************************
 160  * vdec_EndThread: thread destruction
 161  *****************************************************************************
 162  * This function is called when the thread ends after a sucessful
 163  * initialization.
 164  *****************************************************************************/
 165 void vdec_EndThread( vdec_thread_t * p_vdec )
 166 {
 167     intf_DbgMsg("vdec debug: EndThread(%p)", p_vdec);
 168
 169     if( p_vdec->p_idct_data != NULL )
 170     {
 171         free( p_vdec->p_idct_data );
 172     }
 173
 174     free( p_vdec );
 175 }
 176
 177 /*****************************************************************************
 178  * MotionBlock: does one component of the motion compensation
 179  *****************************************************************************/
 180 static __inline__ void MotionBlock( vdec_pool_t * p_pool,
 181                                     boolean_t b_average,
 182                                     int i_x_pred, int i_y_pred,
 183                                     yuv_data_t * pp_dest[3], int i_dest_offset,
 184                                     yuv_data_t * pp_src[3], int i_src_offset,
 185                                     int i_stride, int i_height,
 186                                     boolean_t b_second_half, boolean_t b_color )
 187 {
 188     int             i_xy_half;
 189     yuv_data_t *    p_src1;
 190     yuv_data_t *    p_src2;
 191
 192     i_xy_half = ((i_y_pred & 1) << 1) | (i_x_pred & 1);
 193
 194     p_src1 = pp_src[0] + i_src_offset
 195                 + (i_x_pred >> 1) + (i_y_pred >> 1) * i_stride
 196                 + b_second_half * (i_stride << 3);
 197
 198     p_pool->ppppf_motion[b_average][0][i_xy_half]
 199             ( pp_dest[0] + i_dest_offset + b_second_half * (i_stride << 3),
 200               p_src1, i_stride, i_height );
 201
 202     if( b_color )
 203     {
 204         /* Expanded at compile-time. */
 205         i_x_pred /= 2;
 206         i_y_pred /= 2;
 207
 208         i_xy_half = ((i_y_pred & 1) << 1) | (i_x_pred & 1);
 209         i_stride >>= 1;
 210         i_height >>= 1;
 211         i_src_offset >>= 1;
 212         i_src_offset += b_second_half * (i_stride << 2);
 213         i_dest_offset >>= 1;
 214         i_dest_offset += b_second_half * (i_stride << 2);
 215
 216         p_src1 = pp_src[1] + i_src_offset
 217                     + (i_x_pred >> 1) + (i_y_pred >> 1) * i_stride;
 218         p_src2 = pp_src[2] + i_src_offset
 219                     + (i_x_pred >> 1) + (i_y_pred >> 1) * i_stride;
 220
 221         p_pool->ppppf_motion[b_average][1][i_xy_half]
 222                 ( pp_dest[1] + i_dest_offset, p_src1, i_stride, i_height );
 223         p_pool->ppppf_motion[b_average][1][i_xy_half]
 224                 ( pp_dest[2] + i_dest_offset, p_src2, i_stride, i_height );
 225     }
 226 }
 227
 228
 229 /*****************************************************************************
 230  * DecodeMacroblock: decode a macroblock
 231  *****************************************************************************/
 232 #define DECLARE_DECODEMB( PSZ_NAME, B_COLOR )                               \
 233 void PSZ_NAME ( vdec_thread_t *p_vdec, macroblock_t * p_mb )                \
 234 {                                                                           \
 235     int             i;                                                      \
 236     idct_inner_t *  p_idct;                                                 \
 237     vdec_pool_t *   p_pool = p_vdec->p_pool;                                \
 238                                                                             \
 239     if( !(p_mb->i_mb_modes & MB_INTRA) )                                    \
 240     {                                                                       \
 241         /*                                                                  \
 242          * Motion Compensation (ISO/IEC 13818-2 section 7.6)                \
 243          */                                                                 \
 244         for( i = 0; i < p_mb->i_nb_motions; i++ )                           \
 245         {                                                                   \
 246             motion_inner_t *    p_motion = &p_mb->p_motions[i];             \
 247             MotionBlock( p_pool, p_motion->b_average,                       \
 248                          p_motion->i_x_pred, p_motion->i_y_pred,            \
 249                          p_mb->pp_dest, p_motion->i_dest_offset,            \
 250                          p_motion->pp_source, p_motion->i_src_offset,       \
 251                          p_motion->i_stride, p_motion->i_height,            \
 252                          p_motion->b_second_half, B_COLOR );                \
 253         }                                                                   \
 254                                                                             \
 255         for( i = 0, p_idct = p_mb->p_idcts; i < 4 + 2 * B_COLOR;            \
 256              i++, p_idct++ )                                                \
 257         {                                                                   \
 258             if( p_mb->i_coded_block_pattern & (1 << (5 - i)) )              \
 259             {                                                               \
 260                 /*                                                          \
 261                  * Inverse DCT (ISO/IEC 13818-2 section Annex A) and        \
 262                  * adding prediction and coefficient data (ISO/IEC          \
 263                  * 13818-2 section 7.6.8)                                   \
 264                  */                                                         \
 265                 p_idct->pf_idct( p_idct->pi_block, p_idct->p_dct_data,      \
 266                                  i < 4 ? p_mb->i_lum_dct_stride :           \
 267                                          p_mb->i_chrom_dct_stride,          \
 268                                  p_vdec->p_idct_data,                       \
 269                                  p_idct->i_sparse_pos );                    \
 270             }                                                               \
 271         }                                                                   \
 272     }                                                                       \
 273     else                                                                    \
 274     {                                                                       \
 275         /* Intra macroblock */                                              \
 276         for( i = 0, p_idct = p_mb->p_idcts; i < 4 + 2 * B_COLOR;            \
 277              i++, p_idct++ )                                                \
 278         {                                                                   \
 279             p_idct->pf_idct( p_idct->pi_block, p_idct->p_dct_data,          \
 280                              i < 4 ? p_mb->i_lum_dct_stride :               \
 281                                      p_mb->i_chrom_dct_stride,              \
 282                              p_vdec->p_idct_data,                           \
 283                              p_idct->i_sparse_pos );                        \
 284         }                                                                   \
 285     }                                                                       \
 286 }
 287
 288 DECLARE_DECODEMB( vdec_DecodeMacroblockC, 1 );
 289 DECLARE_DECODEMB( vdec_DecodeMacroblockBW, 0 );
 290
 291 #undef DECLARE_DECODEMB
 292
 293 /*****************************************************************************
 294  * RunThread: video decoder thread
 295  *****************************************************************************
 296  * Video decoder thread. This function does only return when the thread is
 297  * terminated.
 298  *****************************************************************************/
 299 static void RunThread( vdec_thread_t *p_vdec )
 300 {
 301     intf_DbgMsg("vdec debug: running video decoder thread (%p) (pid == %i)",
 302                 p_vdec, getpid());
 303
 304     vdec_InitThread( p_vdec );
 305
 306     /*
 307      * Main loop
 308      */
 309     while( !p_vdec->b_die )
 310     {
 311         macroblock_t *          p_mb;
 312
 313         if( (p_mb = vpar_GetMacroblock( p_vdec->p_pool, &p_vdec->b_die )) != NULL )
 314         {
 315             p_vdec->p_pool->pf_vdec_decode( p_vdec, p_mb );
 316
 317             /* Decoding is finished, release the macroblock and free
 318              * unneeded memory. */
 319             p_vdec->p_pool->pf_free_mb( p_vdec->p_pool, p_mb );
 320         }
 321     }
 322
 323     /* End of thread */
 324     vdec_EndThread( p_vdec );
 325 }
 326