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