stream/cache2.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include "config.h"
  20
  21 // Initial draft of my new cache system...
  22 // Note it runs in 2 processes (using fork()), but doesn't requires locking!!
  23 // TODO: seeking, data consistency checking
  24
  25 #define READ_USLEEP_TIME 10000
  26 #define FILL_USLEEP_TIME 50000
  27 #define PREFILL_SLEEP_TIME 200
  28 #define CONTROL_SLEEP_TIME 0
  29
  30 #include <stdio.h>
  31 #include <stdlib.h>
  32 #include <string.h>
  33 #include <signal.h>
  34 #include <sys/types.h>
  35 #include <unistd.h>
  36 #include <errno.h>
  37
  38 #include "osdep/shmem.h"
  39 #include "osdep/timer.h"
  40 #if defined(__MINGW32__)
  41 #include <windows.h>
  42 static void ThreadProc( void *s );
  43 #elif defined(__OS2__)
  44 #define INCL_DOS
  45 #include <os2.h>
  46 static void ThreadProc( void *s );
  47 #elif defined(PTHREAD_CACHE)
  48 #include <pthread.h>
  49 static void *ThreadProc(void *s);
  50 #else
  51 #include <sys/wait.h>
  52 #endif
  53
  54 #include "mp_msg.h"
  55 #include "help_mp.h"
  56
  57 #include "stream.h"
  58 #include "cache2.h"
  59 extern int use_gui;
  60
  61 typedef struct {
  62   // constats:
  63   unsigned char *buffer;      // base pointer of the alllocated buffer memory
  64   int buffer_size; // size of the alllocated buffer memory
  65   int sector_size; // size of a single sector (2048/2324)
  66   int back_size;   // we should keep back_size amount of old bytes for backward seek
  67   int fill_limit;  // we should fill buffer only if space>=fill_limit
  68   int seek_limit;  // keep filling cache if distanse is less that seek limit
  69   // filler's pointers:
  70   int eof;
  71   off_t min_filepos; // buffer contain only a part of the file, from min-max pos
  72   off_t max_filepos;
  73   off_t offset;      // filepos <-> bufferpos  offset value (filepos of the buffer's first byte)
  74   // reader's pointers:
  75   off_t read_filepos;
  76   // commands/locking:
  77 //  int seek_lock;   // 1 if we will seek/reset buffer, 2 if we are ready for cmd
  78 //  int fifo_flag;  // 1 if we should use FIFO to notice cache about buffer reads.
  79   // callback
  80   stream_t* stream;
  81   volatile int control;
  82   volatile unsigned control_uint_arg;
  83   volatile double control_double_arg;
  84   volatile int control_res;
  85   volatile off_t control_new_pos;
  86   volatile double stream_time_length;
  87 } cache_vars_t;
  88
  89 static int min_fill=0;
  90
  91 int cache_fill_status=0;
  92
  93 static void cache_stats(cache_vars_t *s)
  94 {
  95   int newb=s->max_filepos-s->read_filepos; // new bytes in the buffer
  96   mp_msg(MSGT_CACHE,MSGL_INFO,"0x%06X  [0x%06X]  0x%06X   ",(int)s->min_filepos,(int)s->read_filepos,(int)s->max_filepos);
  97   mp_msg(MSGT_CACHE,MSGL_INFO,"%3d %%  (%3d%%)\n",100*newb/s->buffer_size,100*min_fill/s->buffer_size);
  98 }
  99
 100 static int cache_read(cache_vars_t *s, unsigned char *buf, int size)
 101 {
 102   int total=0;
 103   while(size>0){
 104     int pos,newb,len;
 105
 106   //printf("CACHE2_READ: 0x%X <= 0x%X <= 0x%X  \n",s->min_filepos,s->read_filepos,s->max_filepos);
 107
 108     if(s->read_filepos>=s->max_filepos || s->read_filepos<s->min_filepos){
 109         // eof?
 110         if(s->eof) break;
 111         // waiting for buffer fill...
 112         usec_sleep(READ_USLEEP_TIME); // 10ms
 113         continue; // try again...
 114     }
 115
 116     newb=s->max_filepos-s->read_filepos; // new bytes in the buffer
 117     if(newb<min_fill) min_fill=newb; // statistics...
 118
 119 //    printf("*** newb: %d bytes ***\n",newb);
 120
 121     pos=s->read_filepos - s->offset;
 122     if(pos<0) pos+=s->buffer_size; else
 123     if(pos>=s->buffer_size) pos-=s->buffer_size;
 124
 125     if(newb>s->buffer_size-pos) newb=s->buffer_size-pos; // handle wrap...
 126     if(newb>size) newb=size;
 127
 128     // check:
 129     if(s->read_filepos<s->min_filepos) mp_msg(MSGT_CACHE,MSGL_ERR,"Ehh. s->read_filepos<s->min_filepos !!! Report bug...\n");
 130
 131     // len=write(mem,newb)
 132     //printf("Buffer read: %d bytes\n",newb);
 133     memcpy(buf,&s->buffer[pos],newb);
 134     buf+=newb;
 135     len=newb;
 136     // ...
 137
 138     s->read_filepos+=len;
 139     size-=len;
 140     total+=len;
 141
 142   }
 143   cache_fill_status=(s->max_filepos-s->read_filepos)/(s->buffer_size / 100);
 144   return total;
 145 }
 146
 147 static int cache_fill(cache_vars_t *s)
 148 {
 149   int back,back2,newb,space,len,pos;
 150   off_t read=s->read_filepos;
 151
 152   if(read<s->min_filepos || read>s->max_filepos){
 153       // seek...
 154       mp_msg(MSGT_CACHE,MSGL_DBG2,"Out of boundaries... seeking to 0x%"PRIX64"  \n",(int64_t)read);
 155       // streaming: drop cache contents only if seeking backward or too much fwd:
 156       if(s->stream->type!=STREAMTYPE_STREAM ||
 157           read<s->min_filepos || read>=s->max_filepos+s->seek_limit)
 158       {
 159         s->offset= // FIXME!?
 160         s->min_filepos=s->max_filepos=read; // drop cache content :(
 161         if(s->stream->eof) stream_reset(s->stream);
 162         stream_seek(s->stream,read);
 163         mp_msg(MSGT_CACHE,MSGL_DBG2,"Seek done. new pos: 0x%"PRIX64"  \n",(int64_t)stream_tell(s->stream));
 164       }
 165   }
 166
 167   // calc number of back-bytes:
 168   back=read - s->min_filepos;
 169   if(back<0) back=0; // strange...
 170   if(back>s->back_size) back=s->back_size;
 171
 172   // calc number of new bytes:
 173   newb=s->max_filepos - read;
 174   if(newb<0) newb=0; // strange...
 175
 176   // calc free buffer space:
 177   space=s->buffer_size - (newb+back);
 178
 179   // calc bufferpos:
 180   pos=s->max_filepos - s->offset;
 181   if(pos>=s->buffer_size) pos-=s->buffer_size; // wrap-around
 182
 183   if(space<s->fill_limit){
 184 //    printf("Buffer is full (%d bytes free, limit: %d)\n",space,s->fill_limit);
 185     return 0; // no fill...
 186   }
 187
 188 //  printf("### read=0x%X  back=%d  newb=%d  space=%d  pos=%d\n",read,back,newb,space,pos);
 189
 190   // reduce space if needed:
 191   if(space>s->buffer_size-pos) space=s->buffer_size-pos;
 192
 193 //  if(space>32768) space=32768; // limit one-time block size
 194   if(space>4*s->sector_size) space=4*s->sector_size;
 195
 196 //  if(s->seek_lock) return 0; // FIXME
 197
 198 #if 1
 199   // back+newb+space <= buffer_size
 200   back2=s->buffer_size-(space+newb); // max back size
 201   if(s->min_filepos<(read-back2)) s->min_filepos=read-back2;
 202 #else
 203   s->min_filepos=read-back; // avoid seeking-back to temp area...
 204 #endif
 205
 206   // ....
 207   //printf("Buffer fill: %d bytes of %d\n",space,s->buffer_size);
 208   //len=stream_fill_buffer(s->stream);
 209   //memcpy(&s->buffer[pos],s->stream->buffer,len); // avoid this extra copy!
 210   // ....
 211   len=stream_read(s->stream,&s->buffer[pos],space);
 212   if(!len) s->eof=1;
 213
 214   s->max_filepos+=len;
 215   if(pos+len>=s->buffer_size){
 216       // wrap...
 217       s->offset+=s->buffer_size;
 218   }
 219
 220   return len;
 221
 222 }
 223
 224 static int cache_execute_control(cache_vars_t *s) {
 225   static unsigned last;
 226   int quit = s->control == -2;
 227   if (quit || !s->stream->control) {
 228     s->stream_time_length = 0;
 229     s->control_new_pos = 0;
 230     s->control_res = STREAM_UNSUPPORTED;
 231     s->control = -1;
 232     return !quit;
 233   }
 234   if (GetTimerMS() - last > 99) {
 235     double len;
 236     if (s->stream->control(s->stream, STREAM_CTRL_GET_TIME_LENGTH, &len) == STREAM_OK)
 237       s->stream_time_length = len;
 238     else
 239       s->stream_time_length = 0;
 240     last = GetTimerMS();
 241   }
 242   if (s->control == -1) return 1;
 243   switch (s->control) {
 244     case STREAM_CTRL_GET_CURRENT_TIME:
 245     case STREAM_CTRL_SEEK_TO_TIME:
 246     case STREAM_CTRL_GET_ASPECT_RATIO:
 247       s->control_res = s->stream->control(s->stream, s->control, &s->control_double_arg);
 248       break;
 249     case STREAM_CTRL_SEEK_TO_CHAPTER:
 250     case STREAM_CTRL_GET_NUM_CHAPTERS:
 251     case STREAM_CTRL_GET_CURRENT_CHAPTER:
 252     case STREAM_CTRL_GET_NUM_ANGLES:
 253     case STREAM_CTRL_GET_ANGLE:
 254     case STREAM_CTRL_SET_ANGLE:
 255       s->control_res = s->stream->control(s->stream, s->control, &s->control_uint_arg);
 256       break;
 257     default:
 258       s->control_res = STREAM_UNSUPPORTED;
 259       break;
 260   }
 261   s->control_new_pos = s->stream->pos;
 262   s->control = -1;
 263   return 1;
 264 }
 265
 266 static cache_vars_t* cache_init(int size,int sector){
 267   int num;
 268 #if !defined(__MINGW32__) && !defined(PTHREAD_CACHE) && !defined(__OS2__)
 269   cache_vars_t* s=shmem_alloc(sizeof(cache_vars_t));
 270 #else
 271   cache_vars_t* s=malloc(sizeof(cache_vars_t));
 272 #endif
 273   if(s==NULL) return NULL;
 274
 275   memset(s,0,sizeof(cache_vars_t));
 276   num=size/sector;
 277   if(num < 16){
 278      num = 16;
 279   }//32kb min_size
 280   s->buffer_size=num*sector;
 281   s->sector_size=sector;
 282 #if !defined(__MINGW32__) && !defined(PTHREAD_CACHE) && !defined(__OS2__)
 283   s->buffer=shmem_alloc(s->buffer_size);
 284 #else
 285   s->buffer=malloc(s->buffer_size);
 286 #endif
 287
 288   if(s->buffer == NULL){
 289 #if !defined(__MINGW32__) && !defined(PTHREAD_CACHE) && !defined(__OS2__)
 290     shmem_free(s,sizeof(cache_vars_t));
 291 #else
 292     free(s);
 293 #endif
 294     return NULL;
 295   }
 296
 297   s->fill_limit=8*sector;
 298   s->back_size=s->buffer_size/2;
 299   return s;
 300 }
 301
 302 void cache_uninit(stream_t *s) {
 303   cache_vars_t* c = s->cache_data;
 304   if(s->cache_pid) {
 305 #if defined(__MINGW32__) || defined(PTHREAD_CACHE) || defined(__OS2__)
 306     cache_do_control(s, -2, NULL);
 307 #else
 308     kill(s->cache_pid,SIGKILL);
 309     waitpid(s->cache_pid,NULL,0);
 310 #endif
 311     s->cache_pid = 0;
 312   }
 313   if(!c) return;
 314 #if defined(__MINGW32__) || defined(PTHREAD_CACHE) || defined(__OS2__)
 315   free(c->buffer);
 316   c->buffer = NULL;
 317   c->stream = NULL;
 318   free(s->cache_data);
 319 #else
 320   shmem_free(c->buffer,c->buffer_size);
 321   c->buffer = NULL;
 322   shmem_free(s->cache_data,sizeof(cache_vars_t));
 323 #endif
 324   s->cache_data = NULL;
 325 }
 326
 327 static void exit_sighandler(int x){
 328   // close stream
 329   exit(0);
 330 }
 331
 332 /**
 333  * \return 1 on success, 0 if the function was interrupted and -1 on error
 334  */
 335 int stream_enable_cache(stream_t *stream,int size,int min,int seek_limit){
 336   int ss = stream->sector_size ? stream->sector_size : STREAM_BUFFER_SIZE;
 337   int res = -1;
 338   cache_vars_t* s;
 339
 340   if (stream->flags & STREAM_NON_CACHEABLE) {
 341     mp_msg(MSGT_CACHE,MSGL_STATUS,"\rThis stream is non-cacheable\n");
 342     return 1;
 343   }
 344
 345   s=cache_init(size,ss);
 346   if(s == NULL) return -1;
 347   stream->cache_data=s;
 348   s->stream=stream; // callback
 349   s->seek_limit=seek_limit;
 350
 351
 352   //make sure that we won't wait from cache_fill
 353   //more data than it is alowed to fill
 354   if (s->seek_limit > s->buffer_size - s->fill_limit ){
 355      s->seek_limit = s->buffer_size - s->fill_limit;
 356   }
 357   if (min > s->buffer_size - s->fill_limit) {
 358      min = s->buffer_size - s->fill_limit;
 359   }
 360
 361 #if !defined(__MINGW32__) && !defined(PTHREAD_CACHE) && !defined(__OS2__)
 362   if((stream->cache_pid=fork())){
 363     if ((pid_t)stream->cache_pid == -1)
 364       stream->cache_pid = 0;
 365 #else
 366   {
 367     stream_t* stream2=malloc(sizeof(stream_t));
 368     memcpy(stream2,s->stream,sizeof(stream_t));
 369     s->stream=stream2;
 370 #if defined(__MINGW32__)
 371     stream->cache_pid = _beginthread( ThreadProc, 0, s );
 372 #elif defined(__OS2__)
 373     stream->cache_pid = _beginthread( ThreadProc, NULL, 256 * 1024, s );
 374 #else
 375     {
 376     pthread_t tid;
 377     pthread_create(&tid, NULL, ThreadProc, s);
 378     stream->cache_pid = 1;
 379     }
 380 #endif
 381 #endif
 382     if (!stream->cache_pid) {
 383         mp_msg(MSGT_CACHE, MSGL_ERR,
 384                "Starting cache process/thread failed: %s.\n", strerror(errno));
 385         goto err_out;
 386     }
 387     // wait until cache is filled at least prefill_init %
 388     mp_msg(MSGT_CACHE,MSGL_V,"CACHE_PRE_INIT: %"PRId64" [%"PRId64"] %"PRId64"  pre:%d  eof:%d  \n",
 389         (int64_t)s->min_filepos,(int64_t)s->read_filepos,(int64_t)s->max_filepos,min,s->eof);
 390     while(s->read_filepos<s->min_filepos || s->max_filepos-s->read_filepos<min){
 391         mp_msg(MSGT_CACHE,MSGL_STATUS,MSGTR_CacheFill,
 392             100.0*(float)(s->max_filepos-s->read_filepos)/(float)(s->buffer_size),
 393             (int64_t)s->max_filepos-s->read_filepos
 394         );
 395         if(s->eof) break; // file is smaller than prefill size
 396         if(stream_check_interrupt(PREFILL_SLEEP_TIME)) {
 397           res = 0;
 398           goto err_out;
 399         }
 400     }
 401     mp_msg(MSGT_CACHE,MSGL_STATUS,"\n");
 402     return 1; // parent exits
 403
 404 err_out:
 405     cache_uninit(stream);
 406     return res;
 407   }
 408
 409 #if defined(__MINGW32__) || defined(PTHREAD_CACHE) || defined(__OS2__)
 410 }
 411 #ifdef PTHREAD_CACHE
 412 static void *ThreadProc( void *s ){
 413 #else
 414 static void ThreadProc( void *s ){
 415 #endif
 416 #endif
 417
 418 #ifdef CONFIG_GUI
 419   use_gui = 0; // mp_msg may not use gui stuff in forked code
 420 #endif
 421 // cache thread mainloop:
 422   signal(SIGTERM,exit_sighandler); // kill
 423   do {
 424     if(!cache_fill(s)){
 425          usec_sleep(FILL_USLEEP_TIME); // idle
 426     }
 427 //       cache_stats(s->cache_data);
 428   } while (cache_execute_control(s));
 429 #if defined(__MINGW32__) || defined(__OS2__)
 430   _endthread();
 431 #elif defined(PTHREAD_CACHE)
 432   return NULL;
 433 #else
 434   // make sure forked code never leaves this function
 435   exit(0);
 436 #endif
 437 }
 438
 439 int cache_stream_fill_buffer(stream_t *s){
 440   int len;
 441   if(s->eof){ s->buf_pos=s->buf_len=0; return 0; }
 442   if(!s->cache_pid) return stream_fill_buffer(s);
 443
 444 //  cache_stats(s->cache_data);
 445
 446   if(s->pos!=((cache_vars_t*)s->cache_data)->read_filepos) mp_msg(MSGT_CACHE,MSGL_ERR,"!!! read_filepos differs!!! report this bug...\n");
 447
 448   len=cache_read(s->cache_data,s->buffer, ((cache_vars_t*)s->cache_data)->sector_size);
 449   //printf("cache_stream_fill_buffer->read -> %d\n",len);
 450
 451   if(len<=0){ s->eof=1; s->buf_pos=s->buf_len=0; return 0; }
 452   s->buf_pos=0;
 453   s->buf_len=len;
 454   s->pos+=len;
 455 //  printf("[%d]",len);fflush(stdout);
 456   return len;
 457
 458 }
 459
 460 int cache_stream_seek_long(stream_t *stream,off_t pos){
 461   cache_vars_t* s;
 462   off_t newpos;
 463   if(!stream->cache_pid) return stream_seek_long(stream,pos);
 464
 465   s=stream->cache_data;
 466 //  s->seek_lock=1;
 467
 468   mp_msg(MSGT_CACHE,MSGL_DBG2,"CACHE2_SEEK: 0x%"PRIX64" <= 0x%"PRIX64" (0x%"PRIX64") <= 0x%"PRIX64"  \n",s->min_filepos,pos,s->read_filepos,s->max_filepos);
 469
 470   newpos=pos/s->sector_size; newpos*=s->sector_size; // align
 471   stream->pos=s->read_filepos=newpos;
 472   s->eof=0; // !!!!!!!
 473
 474   cache_stream_fill_buffer(stream);
 475
 476   pos-=newpos;
 477   if(pos>=0 && pos<=stream->buf_len){
 478     stream->buf_pos=pos; // byte position in sector
 479     return 1;
 480   }
 481
 482 //  stream->buf_pos=stream->buf_len=0;
 483 //  return 1;
 484
 485   mp_msg(MSGT_CACHE,MSGL_V,"cache_stream_seek: WARNING! Can't seek to 0x%"PRIX64" !\n",(int64_t)(pos+newpos));
 486   return 0;
 487 }
 488
 489 int cache_do_control(stream_t *stream, int cmd, void *arg) {
 490   cache_vars_t* s = stream->cache_data;
 491   switch (cmd) {
 492     case STREAM_CTRL_SEEK_TO_TIME:
 493       s->control_double_arg = *(double *)arg;
 494       s->control = cmd;
 495       break;
 496     case STREAM_CTRL_SEEK_TO_CHAPTER:
 497     case STREAM_CTRL_SET_ANGLE:
 498       s->control_uint_arg = *(unsigned *)arg;
 499       s->control = cmd;
 500       break;
 501 // the core might call these every frame, they are too slow for this...
 502     case STREAM_CTRL_GET_TIME_LENGTH:
 503 //    case STREAM_CTRL_GET_CURRENT_TIME:
 504       *(double *)arg = s->stream_time_length;
 505       return s->stream_time_length ? STREAM_OK : STREAM_UNSUPPORTED;
 506     case STREAM_CTRL_GET_NUM_CHAPTERS:
 507     case STREAM_CTRL_GET_CURRENT_CHAPTER:
 508     case STREAM_CTRL_GET_ASPECT_RATIO:
 509     case STREAM_CTRL_GET_NUM_ANGLES:
 510     case STREAM_CTRL_GET_ANGLE:
 511     case -2:
 512       s->control = cmd;
 513       break;
 514     default:
 515       return STREAM_UNSUPPORTED;
 516   }
 517   while (s->control != -1)
 518     usec_sleep(CONTROL_SLEEP_TIME);
 519   switch (cmd) {
 520     case STREAM_CTRL_GET_TIME_LENGTH:
 521     case STREAM_CTRL_GET_CURRENT_TIME:
 522     case STREAM_CTRL_GET_ASPECT_RATIO:
 523       *(double *)arg = s->control_double_arg;
 524       break;
 525     case STREAM_CTRL_GET_NUM_CHAPTERS:
 526     case STREAM_CTRL_GET_CURRENT_CHAPTER:
 527     case STREAM_CTRL_GET_NUM_ANGLES:
 528     case STREAM_CTRL_GET_ANGLE:
 529       *(unsigned *)arg = s->control_uint_arg;
 530       break;
 531     case STREAM_CTRL_SEEK_TO_CHAPTER:
 532     case STREAM_CTRL_SEEK_TO_TIME:
 533     case STREAM_CTRL_SET_ANGLE:
 534       stream->pos = s->read_filepos = s->control_new_pos;
 535       break;
 536   }
 537   return s->control_res;
 538 }