stream/cache2.c

   1 #include "config.h"
   2
   3 // Initial draft of my new cache system...
   4 // Note it runs in 2 processes (using fork()), but doesn't requires locking!!
   5 // TODO: seeking, data consistency checking
   6
   7 #define READ_USLEEP_TIME 10000
   8 #define FILL_USLEEP_TIME 50000
   9 #define PREFILL_SLEEP_TIME 200
  10 #define CONTROL_SLEEP_TIME 0
  11
  12 #include <stdio.h>
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <signal.h>
  16 #include <sys/types.h>
  17 #include <unistd.h>
  18
  19 #include "osdep/shmem.h"
  20 #include "osdep/timer.h"
  21 #if defined(__MINGW32__)
  22 #include <windows.h>
  23 static void ThreadProc( void *s );
  24 #elif defined(__OS2__)
  25 #define INCL_DOS
  26 #include <os2.h>
  27 static void ThreadProc( void *s );
  28 #elif defined(PTHREAD_CACHE)
  29 #include <pthread.h>
  30 static void *ThreadProc(void *s);
  31 #else
  32 #include <sys/wait.h>
  33 #endif
  34
  35 #include "mp_msg.h"
  36 #include "help_mp.h"
  37
  38 #include "stream.h"
  39 #include "cache2.h"
  40 extern int use_gui;
  41
  42 typedef struct {
  43   // constats:
  44   unsigned char *buffer;      // base pointer of the alllocated buffer memory
  45   int buffer_size; // size of the alllocated buffer memory
  46   int sector_size; // size of a single sector (2048/2324)
  47   int back_size;   // we should keep back_size amount of old bytes for backward seek
  48   int fill_limit;  // we should fill buffer only if space>=fill_limit
  49   int seek_limit;  // keep filling cache if distanse is less that seek limit
  50   // filler's pointers:
  51   int eof;
  52   off_t min_filepos; // buffer contain only a part of the file, from min-max pos
  53   off_t max_filepos;
  54   off_t offset;      // filepos <-> bufferpos  offset value (filepos of the buffer's first byte)
  55   // reader's pointers:
  56   off_t read_filepos;
  57   // commands/locking:
  58 //  int seek_lock;   // 1 if we will seek/reset buffer, 2 if we are ready for cmd
  59 //  int fifo_flag;  // 1 if we should use FIFO to notice cache about buffer reads.
  60   // callback
  61   stream_t* stream;
  62   volatile int control;
  63   volatile unsigned control_uint_arg;
  64   volatile double control_double_arg;
  65   volatile int control_res;
  66   volatile off_t control_new_pos;
  67   volatile double stream_time_length;
  68 } cache_vars_t;
  69
  70 static int min_fill=0;
  71
  72 int cache_fill_status=0;
  73
  74 static void cache_stats(cache_vars_t* s){
  75   int newb=s->max_filepos-s->read_filepos; // new bytes in the buffer
  76   mp_msg(MSGT_CACHE,MSGL_INFO,"0x%06X  [0x%06X]  0x%06X   ",(int)s->min_filepos,(int)s->read_filepos,(int)s->max_filepos);
  77   mp_msg(MSGT_CACHE,MSGL_INFO,"%3d %%  (%3d%%)\n",100*newb/s->buffer_size,100*min_fill/s->buffer_size);
  78 }
  79
  80 static int cache_read(cache_vars_t* s,unsigned char* buf,int size){
  81   int total=0;
  82   while(size>0){
  83     int pos,newb,len;
  84
  85   //printf("CACHE2_READ: 0x%X <= 0x%X <= 0x%X  \n",s->min_filepos,s->read_filepos,s->max_filepos);
  86
  87     if(s->read_filepos>=s->max_filepos || s->read_filepos<s->min_filepos){
  88         // eof?
  89         if(s->eof) break;
  90         // waiting for buffer fill...
  91         usec_sleep(READ_USLEEP_TIME); // 10ms
  92         continue; // try again...
  93     }
  94
  95     newb=s->max_filepos-s->read_filepos; // new bytes in the buffer
  96     if(newb<min_fill) min_fill=newb; // statistics...
  97
  98 //    printf("*** newb: %d bytes ***\n",newb);
  99
 100     pos=s->read_filepos - s->offset;
 101     if(pos<0) pos+=s->buffer_size; else
 102     if(pos>=s->buffer_size) pos-=s->buffer_size;
 103
 104     if(newb>s->buffer_size-pos) newb=s->buffer_size-pos; // handle wrap...
 105     if(newb>size) newb=size;
 106
 107     // check:
 108     if(s->read_filepos<s->min_filepos) mp_msg(MSGT_CACHE,MSGL_ERR,"Ehh. s->read_filepos<s->min_filepos !!! Report bug...\n");
 109
 110     // len=write(mem,newb)
 111     //printf("Buffer read: %d bytes\n",newb);
 112     memcpy(buf,&s->buffer[pos],newb);
 113     buf+=newb;
 114     len=newb;
 115     // ...
 116
 117     s->read_filepos+=len;
 118     size-=len;
 119     total+=len;
 120
 121   }
 122   cache_fill_status=(s->max_filepos-s->read_filepos)/(s->buffer_size / 100);
 123   return total;
 124 }
 125
 126 static int cache_fill(cache_vars_t* s){
 127   int back,back2,newb,space,len,pos;
 128   off_t read=s->read_filepos;
 129
 130   if(read<s->min_filepos || read>s->max_filepos){
 131       // seek...
 132       mp_msg(MSGT_CACHE,MSGL_DBG2,"Out of boundaries... seeking to 0x%"PRIX64"  \n",(int64_t)read);
 133       // streaming: drop cache contents only if seeking backward or too much fwd:
 134       if(s->stream->type!=STREAMTYPE_STREAM ||
 135           read<s->min_filepos || read>=s->max_filepos+s->seek_limit)
 136       {
 137         s->offset= // FIXME!?
 138         s->min_filepos=s->max_filepos=read; // drop cache content :(
 139         if(s->stream->eof) stream_reset(s->stream);
 140         stream_seek(s->stream,read);
 141         mp_msg(MSGT_CACHE,MSGL_DBG2,"Seek done. new pos: 0x%"PRIX64"  \n",(int64_t)stream_tell(s->stream));
 142       }
 143   }
 144
 145   // calc number of back-bytes:
 146   back=read - s->min_filepos;
 147   if(back<0) back=0; // strange...
 148   if(back>s->back_size) back=s->back_size;
 149
 150   // calc number of new bytes:
 151   newb=s->max_filepos - read;
 152   if(newb<0) newb=0; // strange...
 153
 154   // calc free buffer space:
 155   space=s->buffer_size - (newb+back);
 156
 157   // calc bufferpos:
 158   pos=s->max_filepos - s->offset;
 159   if(pos>=s->buffer_size) pos-=s->buffer_size; // wrap-around
 160
 161   if(space<s->fill_limit){
 162 //    printf("Buffer is full (%d bytes free, limit: %d)\n",space,s->fill_limit);
 163     return 0; // no fill...
 164   }
 165
 166 //  printf("### read=0x%X  back=%d  newb=%d  space=%d  pos=%d\n",read,back,newb,space,pos);
 167
 168   // reduce space if needed:
 169   if(space>s->buffer_size-pos) space=s->buffer_size-pos;
 170
 171 //  if(space>32768) space=32768; // limit one-time block size
 172   if(space>4*s->sector_size) space=4*s->sector_size;
 173
 174 //  if(s->seek_lock) return 0; // FIXME
 175
 176 #if 1
 177   // back+newb+space <= buffer_size
 178   back2=s->buffer_size-(space+newb); // max back size
 179   if(s->min_filepos<(read-back2)) s->min_filepos=read-back2;
 180 #else
 181   s->min_filepos=read-back; // avoid seeking-back to temp area...
 182 #endif
 183
 184   // ....
 185   //printf("Buffer fill: %d bytes of %d\n",space,s->buffer_size);
 186   //len=stream_fill_buffer(s->stream);
 187   //memcpy(&s->buffer[pos],s->stream->buffer,len); // avoid this extra copy!
 188   // ....
 189   len=stream_read(s->stream,&s->buffer[pos],space);
 190   if(!len) s->eof=1;
 191
 192   s->max_filepos+=len;
 193   if(pos+len>=s->buffer_size){
 194       // wrap...
 195       s->offset+=s->buffer_size;
 196   }
 197
 198   return len;
 199
 200 }
 201
 202 static int cache_execute_control(cache_vars_t *s) {
 203   int res = 1;
 204   static unsigned last;
 205   if (!s->stream->control) {
 206     s->stream_time_length = 0;
 207     s->control_new_pos = 0;
 208     s->control_res = STREAM_UNSUPPORTED;
 209     s->control = -1;
 210     return res;
 211   }
 212   if (GetTimerMS() - last > 99) {
 213     double len;
 214     if (s->stream->control(s->stream, STREAM_CTRL_GET_TIME_LENGTH, &len) == STREAM_OK)
 215       s->stream_time_length = len;
 216     else
 217       s->stream_time_length = 0;
 218     last = GetTimerMS();
 219   }
 220   if (s->control == -1) return res;
 221   switch (s->control) {
 222     case STREAM_CTRL_GET_CURRENT_TIME:
 223     case STREAM_CTRL_SEEK_TO_TIME:
 224     case STREAM_CTRL_GET_ASPECT_RATIO:
 225       s->control_res = s->stream->control(s->stream, s->control, &s->control_double_arg);
 226       break;
 227     case STREAM_CTRL_SEEK_TO_CHAPTER:
 228     case STREAM_CTRL_GET_NUM_CHAPTERS:
 229     case STREAM_CTRL_GET_CURRENT_CHAPTER:
 230     case STREAM_CTRL_GET_NUM_ANGLES:
 231     case STREAM_CTRL_GET_ANGLE:
 232     case STREAM_CTRL_SET_ANGLE:
 233       s->control_res = s->stream->control(s->stream, s->control, &s->control_uint_arg);
 234       break;
 235     case -2:
 236       res = 0;
 237     default:
 238       s->control_res = STREAM_UNSUPPORTED;
 239       break;
 240   }
 241   s->control_new_pos = s->stream->pos;
 242   s->control = -1;
 243   return res;
 244 }
 245
 246 static cache_vars_t* cache_init(int size,int sector){
 247   int num;
 248 #if !defined(__MINGW32__) && !defined(PTHREAD_CACHE) && !defined(__OS2__)
 249   cache_vars_t* s=shmem_alloc(sizeof(cache_vars_t));
 250 #else
 251   cache_vars_t* s=malloc(sizeof(cache_vars_t));
 252 #endif
 253   if(s==NULL) return NULL;
 254
 255   memset(s,0,sizeof(cache_vars_t));
 256   num=size/sector;
 257   if(num < 16){
 258      num = 16;
 259   }//32kb min_size
 260   s->buffer_size=num*sector;
 261   s->sector_size=sector;
 262 #if !defined(__MINGW32__) && !defined(PTHREAD_CACHE) && !defined(__OS2__)
 263   s->buffer=shmem_alloc(s->buffer_size);
 264 #else
 265   s->buffer=malloc(s->buffer_size);
 266 #endif
 267
 268   if(s->buffer == NULL){
 269 #if !defined(__MINGW32__) && !defined(PTHREAD_CACHE) && !defined(__OS2__)
 270     shmem_free(s,sizeof(cache_vars_t));
 271 #else
 272     free(s);
 273 #endif
 274     return NULL;
 275   }
 276
 277   s->fill_limit=8*sector;
 278   s->back_size=s->buffer_size/2;
 279   return s;
 280 }
 281
 282 void cache_uninit(stream_t *s) {
 283   cache_vars_t* c = s->cache_data;
 284   if(!s->cache_pid) return;
 285 #if defined(__MINGW32__) || defined(PTHREAD_CACHE) || defined(__OS2__)
 286   cache_do_control(s, -2, NULL);
 287 #else
 288   kill(s->cache_pid,SIGKILL);
 289   waitpid(s->cache_pid,NULL,0);
 290 #endif
 291   if(!c) return;
 292 #if defined(__MINGW32__) || defined(PTHREAD_CACHE) || defined(__OS2__)
 293   free(c->stream);
 294   free(c->buffer);
 295   free(s->cache_data);
 296 #else
 297   shmem_free(c->buffer,c->buffer_size);
 298   shmem_free(s->cache_data,sizeof(cache_vars_t));
 299 #endif
 300 }
 301
 302 static void exit_sighandler(int x){
 303   // close stream
 304   exit(0);
 305 }
 306
 307 int stream_enable_cache(stream_t *stream,int size,int min,int seek_limit){
 308   int ss = stream->sector_size ? stream->sector_size : STREAM_BUFFER_SIZE;
 309   cache_vars_t* s;
 310
 311   if (stream->type==STREAMTYPE_STREAM && stream->fd < 0) {
 312     // The stream has no 'fd' behind it, so is non-cacheable
 313     mp_msg(MSGT_CACHE,MSGL_STATUS,"\rThis stream is non-cacheable\n");
 314     return 1;
 315   }
 316
 317   s=cache_init(size,ss);
 318   if(s == NULL) return 0;
 319   stream->cache_data=s;
 320   s->stream=stream; // callback
 321   s->seek_limit=seek_limit;
 322
 323
 324   //make sure that we won't wait from cache_fill
 325   //more data than it is alowed to fill
 326   if (s->seek_limit > s->buffer_size - s->fill_limit ){
 327      s->seek_limit = s->buffer_size - s->fill_limit;
 328   }
 329   if (min > s->buffer_size - s->fill_limit) {
 330      min = s->buffer_size - s->fill_limit;
 331   }
 332
 333 #if !defined(__MINGW32__) && !defined(PTHREAD_CACHE) && !defined(__OS2__)
 334   if((stream->cache_pid=fork())){
 335 #else
 336   {
 337     stream_t* stream2=malloc(sizeof(stream_t));
 338     memcpy(stream2,s->stream,sizeof(stream_t));
 339     s->stream=stream2;
 340 #if defined(__MINGW32__)
 341     stream->cache_pid = _beginthread( ThreadProc, 0, s );
 342 #elif defined(__OS2__)
 343     stream->cache_pid = _beginthread( ThreadProc, NULL, 256 * 1024, s );
 344 #else
 345     {
 346     pthread_t tid;
 347     pthread_create(&tid, NULL, ThreadProc, s);
 348     stream->cache_pid = 1;
 349     }
 350 #endif
 351 #endif
 352     // wait until cache is filled at least prefill_init %
 353     mp_msg(MSGT_CACHE,MSGL_V,"CACHE_PRE_INIT: %"PRId64" [%"PRId64"] %"PRId64"  pre:%d  eof:%d  \n",
 354         (int64_t)s->min_filepos,(int64_t)s->read_filepos,(int64_t)s->max_filepos,min,s->eof);
 355     while(s->read_filepos<s->min_filepos || s->max_filepos-s->read_filepos<min){
 356         mp_tmsg(MSGT_CACHE,MSGL_STATUS,"\rCache fill: %5.2f%% (%"PRId64" bytes) ",
 357             100.0*(float)(s->max_filepos-s->read_filepos)/(float)(s->buffer_size),
 358             (int64_t)s->max_filepos-s->read_filepos
 359         );
 360         if(s->eof) break; // file is smaller than prefill size
 361         if(stream_check_interrupt(PREFILL_SLEEP_TIME))
 362           return 0;
 363     }
 364     mp_msg(MSGT_CACHE,MSGL_STATUS,"\n");
 365     return 1; // parent exits
 366   }
 367
 368 #if defined(__MINGW32__) || defined(PTHREAD_CACHE) || defined(__OS2__)
 369 }
 370 #ifdef PTHREAD_CACHE
 371 static void *ThreadProc( void *s ){
 372 #else
 373 static void ThreadProc( void *s ){
 374 #endif
 375 #endif
 376
 377 #ifdef CONFIG_GUI
 378   use_gui = 0; // mp_msg may not use gui stuff in forked code
 379 #endif
 380 // cache thread mainloop:
 381   signal(SIGTERM,exit_sighandler); // kill
 382   do {
 383     if(!cache_fill(s)){
 384          usec_sleep(FILL_USLEEP_TIME); // idle
 385     }
 386 //       cache_stats(s->cache_data);
 387   } while (cache_execute_control(s));
 388 #if defined(__MINGW32__) || defined(__OS2__)
 389   _endthread();
 390 #endif
 391 #ifdef PTHREAD_CACHE
 392   return NULL;
 393 #endif
 394 }
 395
 396 int cache_stream_fill_buffer(stream_t *s){
 397   int len;
 398   if(s->eof){ s->buf_pos=s->buf_len=0; return 0; }
 399   if(!s->cache_pid) return stream_fill_buffer(s);
 400
 401 //  cache_stats(s->cache_data);
 402
 403   if(s->pos!=((cache_vars_t*)s->cache_data)->read_filepos) mp_msg(MSGT_CACHE,MSGL_ERR,"!!! read_filepos differs!!! report this bug...\n");
 404
 405   len=cache_read(s->cache_data,s->buffer, ((cache_vars_t*)s->cache_data)->sector_size);
 406   //printf("cache_stream_fill_buffer->read -> %d\n",len);
 407
 408   if(len<=0){ s->eof=1; s->buf_pos=s->buf_len=0; return 0; }
 409   s->buf_pos=0;
 410   s->buf_len=len;
 411   s->pos+=len;
 412 //  printf("[%d]",len);fflush(stdout);
 413   return len;
 414
 415 }
 416
 417 int cache_stream_seek_long(stream_t *stream,off_t pos){
 418   cache_vars_t* s;
 419   off_t newpos;
 420   if(!stream->cache_pid) return stream_seek_long(stream,pos);
 421
 422   s=stream->cache_data;
 423 //  s->seek_lock=1;
 424
 425   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);
 426
 427   newpos=pos/s->sector_size; newpos*=s->sector_size; // align
 428   stream->pos=s->read_filepos=newpos;
 429   s->eof=0; // !!!!!!!
 430
 431   cache_stream_fill_buffer(stream);
 432
 433   pos-=newpos;
 434   if(pos>=0 && pos<=stream->buf_len){
 435     stream->buf_pos=pos; // byte position in sector
 436     return 1;
 437   }
 438
 439 //  stream->buf_pos=stream->buf_len=0;
 440 //  return 1;
 441
 442   mp_msg(MSGT_CACHE,MSGL_V,"cache_stream_seek: WARNING! Can't seek to 0x%"PRIX64" !\n",(int64_t)(pos+newpos));
 443   return 0;
 444 }
 445
 446 int cache_do_control(stream_t *stream, int cmd, void *arg) {
 447   cache_vars_t* s = stream->cache_data;
 448   switch (cmd) {
 449     case STREAM_CTRL_SEEK_TO_TIME:
 450       s->control_double_arg = *(double *)arg;
 451       s->control = cmd;
 452       break;
 453     case STREAM_CTRL_SEEK_TO_CHAPTER:
 454     case STREAM_CTRL_SET_ANGLE:
 455       s->control_uint_arg = *(unsigned *)arg;
 456       s->control = cmd;
 457       break;
 458 // the core might call these every frame, they are too slow for this...
 459     case STREAM_CTRL_GET_TIME_LENGTH:
 460 //    case STREAM_CTRL_GET_CURRENT_TIME:
 461       *(double *)arg = s->stream_time_length;
 462       return s->stream_time_length ? STREAM_OK : STREAM_UNSUPPORTED;
 463     case STREAM_CTRL_GET_NUM_CHAPTERS:
 464     case STREAM_CTRL_GET_CURRENT_CHAPTER:
 465     case STREAM_CTRL_GET_ASPECT_RATIO:
 466     case STREAM_CTRL_GET_NUM_ANGLES:
 467     case STREAM_CTRL_GET_ANGLE:
 468     case -2:
 469       s->control = cmd;
 470       break;
 471     default:
 472       return STREAM_UNSUPPORTED;
 473   }
 474   while (s->control != -1)
 475     usec_sleep(CONTROL_SLEEP_TIME);
 476   switch (cmd) {
 477     case STREAM_CTRL_GET_TIME_LENGTH:
 478     case STREAM_CTRL_GET_CURRENT_TIME:
 479     case STREAM_CTRL_GET_ASPECT_RATIO:
 480       *(double *)arg = s->control_double_arg;
 481       break;
 482     case STREAM_CTRL_GET_NUM_CHAPTERS:
 483     case STREAM_CTRL_GET_CURRENT_CHAPTER:
 484     case STREAM_CTRL_GET_NUM_ANGLES:
 485     case STREAM_CTRL_GET_ANGLE:
 486       *(unsigned *)arg = s->control_uint_arg;
 487       break;
 488     case STREAM_CTRL_SEEK_TO_CHAPTER:
 489     case STREAM_CTRL_SEEK_TO_TIME:
 490     case STREAM_CTRL_SET_ANGLE:
 491       stream->pos = s->read_filepos = s->control_new_pos;
 492       break;
 493   }
 494   return s->control_res;
 495 }