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

   1 /*****************************************************************************
   2  * spu_decoder.c : spu decoder thread
   3  *****************************************************************************
   4  * Copyright (C) 2000 VideoLAN
   5  *
   6  * Authors:
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  21  *****************************************************************************/
  22
  23 /* repompé sur video_decoder.c
  24  * FIXME: passer en terminate/destroy avec les signaux supplémentaires ?? */
  25
  26 /*****************************************************************************
  27  * Preamble
  28  *****************************************************************************/
  29 #include "defs.h"
  30
  31 #include <stdlib.h>                                      /* malloc(), free() */
  32 #include <sys/types.h>                        /* on BSD, uio.h needs types.h */
  33 #include <sys/uio.h>                                          /* for input.h */
  34 #include <unistd.h>                                              /* getpid() */
  35
  36 #include "config.h"
  37 #include "common.h"
  38 #include "threads.h"
  39 #include "mtime.h"
  40 #include "plugins.h"
  41
  42 #include "intf_msg.h"
  43 #include "debug.h"                                                 /* ASSERT */
  44
  45 #include "input.h"
  46 #include "input_netlist.h"
  47 #include "decoder_fifo.h"
  48
  49 #include "video.h"
  50 #include "video_output.h"
  51
  52 #include "spu_decoder.h"
  53
  54 /*
  55  * Local prototypes
  56  */
  57 static int      InitThread          ( spudec_thread_t *p_spudec );
  58 static void     RunThread           ( spudec_thread_t *p_spudec );
  59 static void     ErrorThread         ( spudec_thread_t *p_spudec );
  60 static void     EndThread           ( spudec_thread_t *p_spudec );
  61
  62 #define GetWord( i ) \
  63     i  = GetByte( &p_spudec->bit_stream ) << 8; \
  64     i += GetByte( &p_spudec->bit_stream ); \
  65     i_index += 2;
  66
  67 /*****************************************************************************
  68  * spudec_CreateThread: create a spu decoder thread
  69  *****************************************************************************/
  70 spudec_thread_t * spudec_CreateThread( input_thread_t * p_input )
  71 {
  72     spudec_thread_t *     p_spudec;
  73
  74     intf_DbgMsg("spudec debug: creating spu decoder thread\n");
  75
  76     /* Allocate the memory needed to store the thread's structure */
  77     if ( (p_spudec = (spudec_thread_t *)malloc( sizeof(spudec_thread_t) )) == NULL )
  78     {
  79         intf_ErrMsg("spudec error: not enough memory for spudec_CreateThread() to create the new thread\n");
  80         return( NULL );
  81     }
  82
  83     /*
  84      * Initialize the thread properties
  85      */
  86     p_spudec->b_die = 0;
  87     p_spudec->b_error = 0;
  88
  89     /*
  90      * Initialize the input properties
  91      */
  92     /* Initialize the decoder fifo's data lock and conditional variable and set
  93      * its buffer as empty */
  94     vlc_mutex_init( &p_spudec->fifo.data_lock );
  95     vlc_cond_init( &p_spudec->fifo.data_wait );
  96     p_spudec->fifo.i_start = 0;
  97     p_spudec->fifo.i_end = 0;
  98     /* Initialize the bit stream structure */
  99     p_spudec->bit_stream.p_input = p_input;
 100     p_spudec->bit_stream.p_decoder_fifo = &p_spudec->fifo;
 101     p_spudec->bit_stream.fifo.buffer = 0;
 102     p_spudec->bit_stream.fifo.i_available = 0;
 103
 104     /* Get the video output informations */
 105     p_spudec->p_vout = p_input->p_vout;
 106
 107     /* Spawn the spu decoder thread */
 108     if ( vlc_thread_create(&p_spudec->thread_id, "spu decoder",
 109          (vlc_thread_func_t)RunThread, (void *)p_spudec) )
 110     {
 111         intf_ErrMsg("spudec error: can't spawn spu decoder thread\n");
 112         free( p_spudec );
 113         return( NULL );
 114     }
 115
 116     intf_DbgMsg("spudec debug: spu decoder thread (%p) created\n", p_spudec);
 117     return( p_spudec );
 118 }
 119
 120 /*****************************************************************************
 121  * spudec_DestroyThread: destroy a spu decoder thread
 122  *****************************************************************************
 123  * Destroy and terminate thread. This function will return 0 if the thread could
 124  * be destroyed, and non 0 else. The last case probably means that the thread
 125  * was still active, and another try may succeed.
 126  *****************************************************************************/
 127 void spudec_DestroyThread( spudec_thread_t *p_spudec )
 128 {
 129     intf_DbgMsg( "spudec debug: requesting termination of "
 130                  "spu decoder thread %p\n", p_spudec);
 131
 132     /* Ask thread to kill itself */
 133     p_spudec->b_die = 1;
 134
 135     /* Warn the decoder that we're quitting */
 136     vlc_mutex_lock( &p_spudec->fifo.data_lock );
 137     vlc_cond_signal( &p_spudec->fifo.data_wait );
 138     vlc_mutex_unlock( &p_spudec->fifo.data_lock );
 139
 140     /* Waiting for the decoder thread to exit */
 141     /* Remove this as soon as the "status" flag is implemented */
 142     vlc_thread_join( p_spudec->thread_id );
 143 }
 144
 145 /* following functions are local */
 146
 147 /*****************************************************************************
 148  * InitThread: initialize spu decoder thread
 149  *****************************************************************************
 150  * This function is called from RunThread and performs the second step of the
 151  * initialization. It returns 0 on success. Note that the thread's flag are not
 152  * modified inside this function.
 153  *****************************************************************************/
 154 static int InitThread( spudec_thread_t *p_spudec )
 155 {
 156     intf_DbgMsg("spudec debug: initializing spu decoder thread %p\n", p_spudec);
 157
 158     /* Our first job is to initialize the bit stream structure with the
 159      * beginning of the input stream */
 160     vlc_mutex_lock( &p_spudec->fifo.data_lock );
 161     while ( DECODER_FIFO_ISEMPTY(p_spudec->fifo) )
 162     {
 163         if ( p_spudec->b_die )
 164         {
 165             vlc_mutex_unlock( &p_spudec->fifo.data_lock );
 166             return( 1 );
 167         }
 168         vlc_cond_wait( &p_spudec->fifo.data_wait, &p_spudec->fifo.data_lock );
 169     }
 170
 171     p_spudec->bit_stream.p_ts = DECODER_FIFO_START( p_spudec->fifo )->p_first_ts;
 172     p_spudec->bit_stream.p_byte = p_spudec->bit_stream.p_ts->buffer + p_spudec->bit_stream.p_ts->i_payload_start;
 173     p_spudec->bit_stream.p_end = p_spudec->bit_stream.p_ts->buffer + p_spudec->bit_stream.p_ts->i_payload_end;
 174     vlc_mutex_unlock( &p_spudec->fifo.data_lock );
 175
 176     /* Mark thread as running and return */
 177     intf_DbgMsg( "spudec debug: InitThread(%p) succeeded\n", p_spudec );
 178     return( 0 );
 179 }
 180
 181 /*****************************************************************************
 182  * RunThread: spu decoder thread
 183  *****************************************************************************
 184  * spu decoder thread. This function only returns when the thread is
 185  * terminated.
 186  *****************************************************************************/
 187 static void RunThread( spudec_thread_t *p_spudec )
 188 {
 189     intf_DbgMsg("spudec debug: running spu decoder thread (%p) (pid == %i)\n",
 190         p_spudec, getpid());
 191
 192     /*
 193      * Initialize thread and free configuration
 194      */
 195     p_spudec->b_error = InitThread( p_spudec );
 196
 197     p_spudec->b_run = 1;
 198
 199     /*
 200      * Main loop - it is not executed if an error occured during
 201      * initialization
 202      */
 203     while( (!p_spudec->b_die) && (!p_spudec->b_error) )
 204     {
 205         int i_packet_size;
 206         int i_rle_size;
 207         int i_index;
 208         int i_pes_size;
 209         int i_pes_count;
 210         boolean_t       b_finished;
 211         unsigned char * p_spu_data;
 212         subpicture_t  * p_spu = NULL;
 213
 214         while( !DECODER_FIFO_ISEMPTY(p_spudec->fifo) )
 215         {
 216             /* wait for the next SPU ID.
 217              * XXX: We trash 0xff bytes since they probably come from
 218              * an incomplete previous packet */
 219             do
 220             {
 221                 i_packet_size = GetByte( &p_spudec->bit_stream );
 222             }
 223             while( i_packet_size == 0xff );
 224
 225             if( p_spudec->b_die )
 226                 break;
 227
 228             /* the total size - should equal the sum of the
 229              * PES packet size that form the SPU packet */
 230             i_packet_size = ( i_packet_size << 8 )
 231                             + GetByte( &p_spudec->bit_stream );
 232             i_index = 2;
 233
 234             /* get the useful PES size (real size - 10) */
 235             i_pes_size = DECODER_FIFO_START(p_spudec->fifo)->i_pes_size - 9;
 236             i_pes_count = 1;
 237
 238             /* the RLE stuff size */
 239             GetWord( i_rle_size );
 240
 241             /* if the values we got aren't too strange, decode the data */
 242             if( i_rle_size < i_packet_size )
 243             {
 244                 /* allocate the subpicture.
 245                  * FIXME: we should check if the allocation failed */
 246                 p_spu = vout_CreateSubPicture( p_spudec->p_vout,
 247                                            DVD_SUBPICTURE, i_rle_size );
 248                 p_spu_data = p_spu->p_data;
 249
 250                 /* get display time */
 251                 p_spu->begin_date = p_spu->end_date
 252                                 = DECODER_FIFO_START(p_spudec->fifo)->i_pts;
 253
 254                 /* getting the RLE part */
 255                 while( i_index++ < i_rle_size )
 256                 {
 257                     /* skip the leading byte of a PES */
 258                     /* FIXME: this part definitely looks strange */
 259                     if ( !((i_index + 3) % i_pes_size) )
 260                     {
 261                         i_pes_count++;
 262                     }
 263                     *p_spu_data++ = GetByte( &p_spudec->bit_stream );
 264                 }
 265
 266                 /* getting the control part */
 267                 b_finished = 0;
 268                 do
 269                 {
 270                     unsigned char i_cmd;
 271                     unsigned int i_word;
 272                     unsigned int i_date;
 273
 274                     /* the date */
 275                     GetWord( i_date );
 276
 277                     /* next offset, no next offset if == i_index-5 */
 278                     GetWord( i_word );
 279                     b_finished = ( i_index - 5 >= i_word );
 280
 281                     do
 282                     {
 283                         i_cmd = GetByte( &p_spudec->bit_stream );
 284                         i_index++;
 285
 286                         switch( i_cmd )
 287                         {
 288                             case SPU_CMD_FORCE_DISPLAY:
 289                                 /* 00 (force displaying) */
 290                                 break;
 291                             /* FIXME: here we have to calculate dates. It's
 292                              * around i_date * 12000 but I don't know
 293                              * how much exactly.
 294                              */
 295                             case SPU_CMD_START_DISPLAY:
 296                                 /* 01 (start displaying) */
 297                                 p_spu->begin_date += ( i_date * 12000 );
 298                                 break;
 299                             case SPU_CMD_STOP_DISPLAY:
 300                                 /* 02 (stop displaying) */
 301                                 p_spu->end_date += ( i_date * 12000 );
 302                                 break;
 303                             case SPU_CMD_SET_PALETTE:
 304                                 /* 03xxxx (palette) */
 305                                 GetWord( i_word );
 306                                 break;
 307                             case SPU_CMD_SET_ALPHACHANNEL:
 308                                 /* 04xxxx (alpha channel) */
 309                                 GetWord( i_word );
 310                                 break;
 311                             case SPU_CMD_SET_COORDINATES:
 312                                 /* 05xxxyyyxxxyyy (coordinates) */
 313                                 i_word = GetByte( &p_spudec->bit_stream );
 314                                 p_spu->i_x = (i_word << 4)
 315                                     | GetBits( &p_spudec->bit_stream, 4 );
 316
 317                                 i_word = GetBits( &p_spudec->bit_stream, 4 );
 318                                 p_spu->i_width = p_spu->i_x - ( (i_word << 8)
 319                                     | GetByte( &p_spudec->bit_stream ) ) + 1;
 320
 321                                 i_word = GetByte( &p_spudec->bit_stream );
 322                                 p_spu->i_y = (i_word << 4)
 323                                     | GetBits( &p_spudec->bit_stream, 4 );
 324
 325                                 i_word = GetBits( &p_spudec->bit_stream, 4 );
 326                                 p_spu->i_height = p_spu->i_y - ( (i_word << 8)
 327                                     | GetByte( &p_spudec->bit_stream ) ) + 1;
 328
 329                                 i_index += 6;
 330                                 break;
 331                             case SPU_CMD_SET_OFFSETS:
 332                                 /* 06xxxxyyyy (byte offsets) */
 333                                 GetWord( i_word );
 334                                 p_spu->type.spu.i_offset[0] = i_word - 4;
 335                                 GetWord( i_word );
 336                                 p_spu->type.spu.i_offset[1] = i_word - 4;
 337                                 break;
 338                             case SPU_CMD_END:
 339                                 /* ff (end) */
 340                                 break;
 341                             default:
 342                                 /* ?? (unknown command) */
 343                                 intf_ErrMsg( "spudec: unknown command 0x%.2x\n",
 344                                              i_cmd );
 345                                 break;
 346                         }
 347                     }
 348                     while( i_cmd != SPU_CMD_END );
 349                 }
 350                 while( !b_finished );
 351
 352                 /* SPU is finished - we can tell the video output
 353                  * to display it */
 354                 vout_DisplaySubPicture( p_spudec->p_vout, p_spu );
 355             }
 356             else
 357             {
 358                 /* Unexpected PES packet - trash it */
 359                 intf_ErrMsg( "spudec: trying to recover from bad packet\n" );
 360                 vlc_mutex_lock( &p_spudec->fifo.data_lock );
 361                 input_NetlistFreePES( p_spudec->bit_stream.p_input,
 362                                       DECODER_FIFO_START(p_spudec->fifo) );
 363                 DECODER_FIFO_INCSTART( p_spudec->fifo );
 364                 vlc_mutex_unlock( &p_spudec->fifo.data_lock );
 365             }
 366
 367         }
 368     }
 369
 370     /*
 371      * Error loop
 372      */
 373     if( p_spudec->b_error )
 374     {
 375         ErrorThread( p_spudec );
 376     }
 377
 378     p_spudec->b_run = 0;
 379
 380     /* End of thread */
 381     EndThread( p_spudec );
 382 }
 383
 384 /*****************************************************************************
 385  * ErrorThread: RunThread() error loop
 386  *****************************************************************************
 387  * This function is called when an error occured during thread main's loop. The
 388  * thread can still receive feed, but must be ready to terminate as soon as
 389  * possible.
 390  *****************************************************************************/
 391 static void ErrorThread( spudec_thread_t *p_spudec )
 392 {
 393     /* We take the lock, because we are going to read/write the start/end
 394      * indexes of the decoder fifo */
 395     vlc_mutex_lock( &p_spudec->fifo.data_lock );
 396
 397     /* Wait until a `die' order is sent */
 398     while( !p_spudec->b_die )
 399     {
 400         /* Trash all received PES packets */
 401         while( !DECODER_FIFO_ISEMPTY(p_spudec->fifo) )
 402         {
 403             input_NetlistFreePES( p_spudec->bit_stream.p_input, DECODER_FIFO_START(p_spudec->fifo) );
 404             DECODER_FIFO_INCSTART( p_spudec->fifo );
 405         }
 406
 407         /* Waiting for the input thread to put new PES packets in the fifo */
 408         vlc_cond_wait( &p_spudec->fifo.data_wait, &p_spudec->fifo.data_lock );
 409     }
 410
 411     /* We can release the lock before leaving */
 412     vlc_mutex_unlock( &p_spudec->fifo.data_lock );
 413 }
 414
 415 /*****************************************************************************
 416  * EndThread: thread destruction
 417  *****************************************************************************
 418  * This function is called when the thread ends after a sucessful
 419  * initialization.
 420  *****************************************************************************/
 421 static void EndThread( spudec_thread_t *p_spudec )
 422 {
 423     intf_DbgMsg( "spudec debug: destroying spu decoder thread %p\n", p_spudec );
 424     free( p_spudec );
 425     intf_DbgMsg( "spudec debug: spu decoder thread %p destroyed\n", p_spudec);
 426 }
 427