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

   1 /*****************************************************************************
   2  * video_decoder.c : video decoder thread
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 VideoLAN
   5  * $Id: video_decoder.c,v 1.2 2001/11/28 15:08:05 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 "intf_msg.h"
  41 #include "threads.h"
  42 #include "mtime.h"
  43
  44 #include "video.h"
  45 #include "video_output.h"
  46
  47 #include "modules_export.h"
  48 #include "stream_control.h"
  49 #include "input_ext-dec.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,
 187                                     int i_chroma_format )
 188 {
 189     int             i_xy_half;
 190     yuv_data_t *    p_src1;
 191     yuv_data_t *    p_src2;
 192
 193     i_xy_half = ((i_y_pred & 1) << 1) | (i_x_pred & 1);
 194
 195     p_src1 = pp_src[0] + i_src_offset
 196                 + (i_x_pred >> 1) + (i_y_pred >> 1) * i_stride
 197                 + b_second_half * (i_stride << 3);
 198
 199     p_pool->ppppf_motion[b_average][0][i_xy_half]
 200             ( pp_dest[0] + i_dest_offset + b_second_half * (i_stride << 3),
 201               p_src1, i_stride, i_height );
 202
 203     if( i_chroma_format != CHROMA_NONE )
 204     {
 205         /* Expanded at compile-time. */
 206         if( i_chroma_format != CHROMA_444 )
 207         {
 208             i_x_pred /= 2;
 209             i_stride >>= 1;
 210             i_src_offset >>= 1;
 211             i_dest_offset >>= 1;
 212         }
 213         if( i_chroma_format == CHROMA_420 )
 214         {
 215             i_y_pred /= 2;
 216             i_height >>= 1;
 217         }
 218
 219         i_xy_half = ((i_y_pred & 1) << 1) | (i_x_pred & 1);
 220
 221         i_src_offset += b_second_half * (i_stride << 3);
 222         i_dest_offset += b_second_half * (i_stride << 3);
 223
 224         p_src1 = pp_src[1] + i_src_offset
 225                     + (i_x_pred >> 1) + (i_y_pred >> 1) * i_stride;
 226         p_src2 = pp_src[2] + i_src_offset
 227                     + (i_x_pred >> 1) + (i_y_pred >> 1) * i_stride;
 228
 229         p_pool->ppppf_motion[b_average][(i_chroma_format != CHROMA_444)]
 230                             [i_xy_half]
 231                 ( pp_dest[1] + i_dest_offset, p_src1, i_stride, i_height );
 232         p_pool->ppppf_motion[b_average][(i_chroma_format != CHROMA_444)]
 233                             [i_xy_half]
 234                 ( pp_dest[2] + i_dest_offset, p_src2, i_stride, i_height );
 235     }
 236 }
 237
 238
 239 /*****************************************************************************
 240  * DecodeMacroblock: decode a macroblock
 241  *****************************************************************************/
 242 #define DECODE_INTRA_BLOCK( i_b, p_dest, I_CHROMA )                         \
 243     p_idct = &p_mb->p_idcts[i_b];                                           \
 244     p_idct->pf_idct( p_idct->pi_block, p_dest,                              \
 245                      i_b < 4 ? i_lum_dct_stride :                           \
 246                          I_CHROMA == CHROMA_420 ?                           \
 247                          p_vpar->picture.i_field_width >> 1 :               \
 248                          i_chrom_dct_stride,                                \
 249                      p_vdec->p_idct_data, p_idct->i_sparse_pos );
 250
 251 #define DECODE_NONINTRA_BLOCK( i_b, p_dest, I_CHROMA )                      \
 252     if( p_mb->i_coded_block_pattern & (1 << (11 - (i_b))) )                 \
 253     {                                                                       \
 254         DECODE_INTRA_BLOCK( i_b, p_dest, I_CHROMA );                        \
 255     }
 256
 257 #define DECLARE_DECODEMB( PSZ_NAME, I_CHROMA )                              \
 258 void PSZ_NAME ( vdec_thread_t *p_vdec, macroblock_t * p_mb )                \
 259 {                                                                           \
 260     int             i, i_lum_dct_offset, i_lum_dct_stride;                  \
 261     /* This is to keep the compiler happy with CHROMA_420 and CHROMA_NONE */\
 262     int             i_chrom_dct_offset __attribute__((unused));             \
 263     int             i_chrom_dct_stride __attribute__((unused));             \
 264     idct_inner_t *  p_idct;                                                 \
 265     vdec_pool_t *   p_pool = p_vdec->p_pool;                                \
 266     vpar_thread_t * p_vpar = p_pool->p_vpar;                                \
 267                                                                             \
 268     if( p_mb->i_mb_modes & DCT_TYPE_INTERLACED )                            \
 269     {                                                                       \
 270         i_lum_dct_offset = p_vpar->picture.i_field_width;                   \
 271         i_lum_dct_stride = p_vpar->picture.i_field_width * 2;             \
 272         if( I_CHROMA == CHROMA_422 )                                        \
 273         {                                                                   \
 274             i_chrom_dct_offset = p_vpar->picture.i_field_width >> 1;        \
 275             i_chrom_dct_stride = p_vpar->picture.i_field_width;             \
 276         }                                                                   \
 277         else if( I_CHROMA == CHROMA_444 )                                   \
 278         {                                                                   \
 279             i_chrom_dct_offset = p_vpar->picture.i_field_width;             \
 280             i_chrom_dct_stride = p_vpar->picture.i_field_width * 2;         \
 281         }                                                                   \
 282     }                                                                       \
 283     else                                                                    \
 284     {                                                                       \
 285         i_lum_dct_offset = p_vpar->picture.i_field_width * 8;               \
 286         i_lum_dct_stride = p_vpar->picture.i_field_width;                   \
 287         if( I_CHROMA == CHROMA_422 )                                        \
 288         {                                                                   \
 289             i_chrom_dct_offset = p_vpar->picture.i_field_width * 4;         \
 290             i_chrom_dct_stride = p_vpar->picture.i_field_width >> 1;        \
 291         }                                                                   \
 292         else if( I_CHROMA == CHROMA_444 )                                   \
 293         {                                                                   \
 294             i_chrom_dct_offset = p_vpar->picture.i_field_width * 8;         \
 295             i_chrom_dct_stride = p_vpar->picture.i_field_width;             \
 296         }                                                                   \
 297     }                                                                       \
 298                                                                             \
 299     if( !(p_mb->i_mb_modes & MB_INTRA) )                                    \
 300     {                                                                       \
 301         /*                                                                  \
 302          * Motion Compensation (ISO/IEC 13818-2 section 7.6)                \
 303          */                                                                 \
 304         for( i = 0; i < p_mb->i_nb_motions; i++ )                           \
 305         {                                                                   \
 306             motion_inner_t *    p_motion = &p_mb->p_motions[i];             \
 307             MotionBlock( p_pool, p_motion->b_average,                       \
 308                          p_motion->i_x_pred, p_motion->i_y_pred,            \
 309                          p_mb->pp_dest, p_motion->i_dest_offset,            \
 310                          p_motion->pp_source, p_motion->i_src_offset,       \
 311                          p_motion->i_stride, p_motion->i_height,            \
 312                          p_motion->b_second_half, I_CHROMA );               \
 313         }                                                                   \
 314                                                                             \
 315         /*                                                                  \
 316          * Inverse DCT (ISO/IEC 13818-2 section Annex A) and                \
 317          * adding prediction and coefficient data (ISO/IEC                  \
 318          * 13818-2 section 7.6.8)                                           \
 319          */                                                                 \
 320         DECODE_NONINTRA_BLOCK( 0, p_mb->p_y_data, I_CHROMA );               \
 321         DECODE_NONINTRA_BLOCK( 1, p_mb->p_y_data + 8, I_CHROMA );           \
 322         DECODE_NONINTRA_BLOCK( 2, p_mb->p_y_data + i_lum_dct_offset,        \
 323                                I_CHROMA );                                  \
 324         DECODE_NONINTRA_BLOCK( 3, p_mb->p_y_data + i_lum_dct_offset + 8,    \
 325                                I_CHROMA );                                  \
 326         if( I_CHROMA != CHROMA_NONE )                                       \
 327         {                                                                   \
 328             DECODE_NONINTRA_BLOCK( 4, p_mb->p_u_data, I_CHROMA );           \
 329             DECODE_NONINTRA_BLOCK( 5, p_mb->p_v_data, I_CHROMA );           \
 330             if( I_CHROMA != CHROMA_420 )                                    \
 331             {                                                               \
 332                 DECODE_NONINTRA_BLOCK( 6, p_mb->p_u_data                    \
 333                                            + i_chrom_dct_offset, I_CHROMA );\
 334                 DECODE_NONINTRA_BLOCK( 7, p_mb->p_v_data                    \
 335                                            + i_chrom_dct_offset, I_CHROMA );\
 336                 if( I_CHROMA == CHROMA_444 )                                \
 337                 {                                                           \
 338                     DECODE_NONINTRA_BLOCK( 8, p_mb->p_u_data + 8,           \
 339                                            I_CHROMA );                      \
 340                     DECODE_NONINTRA_BLOCK( 9, p_mb->p_v_data + 8,           \
 341                                            I_CHROMA );                      \
 342                     DECODE_NONINTRA_BLOCK( 10, p_mb->p_u_data + 8           \
 343                                            + i_chrom_dct_offset, I_CHROMA );\
 344                     DECODE_NONINTRA_BLOCK( 11, p_mb->p_v_data + 8           \
 345                                            + i_chrom_dct_offset, I_CHROMA );\
 346                 }                                                           \
 347             }                                                               \
 348         }                                                                   \
 349     }                                                                       \
 350     else                                                                    \
 351     {                                                                       \
 352         /* Intra macroblock */                                              \
 353         DECODE_INTRA_BLOCK( 0, p_mb->p_y_data, I_CHROMA );                  \
 354         DECODE_INTRA_BLOCK( 1, p_mb->p_y_data + 8, I_CHROMA );              \
 355         DECODE_INTRA_BLOCK( 2, p_mb->p_y_data + i_lum_dct_offset,           \
 356                             I_CHROMA );                                     \
 357         DECODE_INTRA_BLOCK( 3, p_mb->p_y_data + i_lum_dct_offset + 8,       \
 358                             I_CHROMA );                                     \
 359         if( I_CHROMA != CHROMA_NONE )                                       \
 360         {                                                                   \
 361             DECODE_INTRA_BLOCK( 4, p_mb->p_u_data, I_CHROMA );              \
 362             DECODE_INTRA_BLOCK( 5, p_mb->p_v_data, I_CHROMA );              \
 363             if( I_CHROMA != CHROMA_420 )                                    \
 364             {                                                               \
 365                 DECODE_INTRA_BLOCK( 6, p_mb->p_u_data                       \
 366                                         + i_chrom_dct_offset, I_CHROMA );   \
 367                 DECODE_INTRA_BLOCK( 7, p_mb->p_v_data                       \
 368                                         + i_chrom_dct_offset, I_CHROMA );   \
 369                 if( I_CHROMA == CHROMA_444 )                                \
 370                 {                                                           \
 371                     DECODE_INTRA_BLOCK( 8, p_mb->p_u_data + 8, I_CHROMA );  \
 372                     DECODE_INTRA_BLOCK( 9, p_mb->p_v_data + 8, I_CHROMA );  \
 373                     DECODE_INTRA_BLOCK( 10, p_mb->p_u_data + 8              \
 374                                            + i_chrom_dct_offset, I_CHROMA );\
 375                     DECODE_INTRA_BLOCK( 11, p_mb->p_v_data + 8              \
 376                                            + i_chrom_dct_offset, I_CHROMA );\
 377                 }                                                           \
 378             }                                                               \
 379         }                                                                   \
 380     }                                                                       \
 381 }
 382
 383 DECLARE_DECODEMB( vdec_DecodeMacroblockBW, CHROMA_NONE );
 384 DECLARE_DECODEMB( vdec_DecodeMacroblock420, CHROMA_420 );
 385 DECLARE_DECODEMB( vdec_DecodeMacroblock422, CHROMA_422 );
 386 DECLARE_DECODEMB( vdec_DecodeMacroblock444, CHROMA_444 );
 387
 388 #undef DECLARE_DECODEMB
 389
 390 /*****************************************************************************
 391  * RunThread: video decoder thread
 392  *****************************************************************************
 393  * Video decoder thread. This function does only return when the thread is
 394  * terminated.
 395  *****************************************************************************/
 396 static void RunThread( vdec_thread_t *p_vdec )
 397 {
 398     intf_DbgMsg("vdec debug: running video decoder thread (%p) (pid == %i)",
 399                 p_vdec, getpid());
 400
 401     vdec_InitThread( p_vdec );
 402
 403     /*
 404      * Main loop
 405      */
 406     while( !p_vdec->b_die )
 407     {
 408         macroblock_t *          p_mb;
 409
 410         if( (p_mb = vpar_GetMacroblock( p_vdec->p_pool, &p_vdec->b_die )) != NULL )
 411         {
 412             p_vdec->p_pool->pf_vdec_decode( p_vdec, p_mb );
 413
 414             /* Decoding is finished, release the macroblock and free
 415              * unneeded memory. */
 416             p_vdec->p_pool->pf_free_mb( p_vdec->p_pool, p_mb );
 417         }
 418     }
 419
 420     /* End of thread */
 421     vdec_EndThread( p_vdec );
 422 }
 423