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
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <signal.h>
  15 #include <sys/types.h>
  16 #include <unistd.h>
  17
  18 #include "osdep/timer.h"
  19 #ifndef WIN32
  20 #include <sys/wait.h>
  21 #include "osdep/shmem.h"
  22 #else
  23 #include <windows.h>
  24 static DWORD WINAPI ThreadProc(void* s);
  25 #endif
  26
  27 #include "mp_msg.h"
  28 #include "help_mp.h"
  29
  30 #include "stream.h"
  31 #include "input/input.h"
  32
  33 int stream_fill_buffer(stream_t *s);
  34 int stream_seek_long(stream_t *s,off_t pos);
  35
  36 typedef struct {
  37   // constats:
  38   unsigned char *buffer;      // base pointer of the alllocated buffer memory
  39   int buffer_size; // size of the alllocated buffer memory
  40   int sector_size; // size of a single sector (2048/2324)
  41   int back_size;   // we should keep back_size amount of old bytes for backward seek
  42   int fill_limit;  // we should fill buffer only if space>=fill_limit
  43   int seek_limit;  // keep filling cache if distanse is less that seek limit
  44   // filler's pointers:
  45   int eof;
  46   off_t min_filepos; // buffer contain only a part of the file, from min-max pos
  47   off_t max_filepos;
  48   off_t offset;      // filepos <-> bufferpos  offset value (filepos of the buffer's first byte)
  49   // reader's pointers:
  50   off_t read_filepos;
  51   // commands/locking:
  52 //  int seek_lock;   // 1 if we will seek/reset buffer, 2 if we are ready for cmd
  53 //  int fifo_flag;  // 1 if we should use FIFO to notice cache about buffer reads.
  54   // callback
  55   stream_t* stream;
  56 } cache_vars_t;
  57
  58 static int min_fill=0;
  59
  60 int cache_fill_status=0;
  61
  62 void cache_stats(cache_vars_t* s){
  63   int newb=s->max_filepos-s->read_filepos; // new bytes in the buffer
  64   mp_msg(MSGT_CACHE,MSGL_INFO,"0x%06X  [0x%06X]  0x%06X   ",(int)s->min_filepos,(int)s->read_filepos,(int)s->max_filepos);
  65   mp_msg(MSGT_CACHE,MSGL_INFO,"%3d %%  (%3d%%)\n",100*newb/s->buffer_size,100*min_fill/s->buffer_size);
  66 }
  67
  68 int cache_read(cache_vars_t* s,unsigned char* buf,int size){
  69   int total=0;
  70   while(size>0){
  71     int pos,newb,len;
  72
  73   //printf("CACHE2_READ: 0x%X <= 0x%X <= 0x%X  \n",s->min_filepos,s->read_filepos,s->max_filepos);
  74
  75     if(s->read_filepos>=s->max_filepos || s->read_filepos<s->min_filepos){
  76         // eof?
  77         if(s->eof) break;
  78         // waiting for buffer fill...
  79         usec_sleep(READ_USLEEP_TIME); // 10ms
  80         continue; // try again...
  81     }
  82
  83     newb=s->max_filepos-s->read_filepos; // new bytes in the buffer
  84     if(newb<min_fill) min_fill=newb; // statistics...
  85
  86 //    printf("*** newb: %d bytes ***\n",newb);
  87
  88     pos=s->read_filepos - s->offset;
  89     if(pos<0) pos+=s->buffer_size; else
  90     if(pos>=s->buffer_size) pos-=s->buffer_size;
  91
  92     if(newb>s->buffer_size-pos) newb=s->buffer_size-pos; // handle wrap...
  93     if(newb>size) newb=size;
  94
  95     // check:
  96     if(s->read_filepos<s->min_filepos) mp_msg(MSGT_CACHE,MSGL_ERR,"Ehh. s->read_filepos<s->min_filepos !!! Report bug...\n");
  97
  98     // len=write(mem,newb)
  99     //printf("Buffer read: %d bytes\n",newb);
 100     memcpy(buf,&s->buffer[pos],newb);
 101     buf+=newb;
 102     len=newb;
 103     // ...
 104
 105     s->read_filepos+=len;
 106     size-=len;
 107     total+=len;
 108
 109   }
 110   cache_fill_status=(s->max_filepos-s->read_filepos)/(s->buffer_size / 100);
 111   return total;
 112 }
 113
 114 int cache_fill(cache_vars_t* s){
 115   int back,back2,newb,space,len,pos;
 116   off_t read=s->read_filepos;
 117
 118   if(read<s->min_filepos || read>s->max_filepos){
 119       // seek...
 120       mp_msg(MSGT_CACHE,MSGL_DBG2,"Out of boundaries... seeking to 0x%"PRIX64"  \n",(int64_t)read);
 121       // streaming: drop cache contents only if seeking backward or too much fwd:
 122       if(s->stream->type!=STREAMTYPE_STREAM ||
 123           read<s->min_filepos || read>=s->max_filepos+s->seek_limit)
 124       {
 125         s->offset= // FIXME!?
 126         s->min_filepos=s->max_filepos=read; // drop cache content :(
 127         if(s->stream->eof) stream_reset(s->stream);
 128         stream_seek(s->stream,read);
 129         mp_msg(MSGT_CACHE,MSGL_DBG2,"Seek done. new pos: 0x%"PRIX64"  \n",(int64_t)stream_tell(s->stream));
 130       }
 131   }
 132
 133   // calc number of back-bytes:
 134   back=read - s->min_filepos;
 135   if(back<0) back=0; // strange...
 136   if(back>s->back_size) back=s->back_size;
 137
 138   // calc number of new bytes:
 139   newb=s->max_filepos - read;
 140   if(newb<0) newb=0; // strange...
 141
 142   // calc free buffer space:
 143   space=s->buffer_size - (newb+back);
 144
 145   // calc bufferpos:
 146   pos=s->max_filepos - s->offset;
 147   if(pos>=s->buffer_size) pos-=s->buffer_size; // wrap-around
 148
 149   if(space<s->fill_limit){
 150 //    printf("Buffer is full (%d bytes free, limit: %d)\n",space,s->fill_limit);
 151     return 0; // no fill...
 152   }
 153
 154 //  printf("### read=0x%X  back=%d  newb=%d  space=%d  pos=%d\n",read,back,newb,space,pos);
 155
 156   // reduce space if needed:
 157   if(space>s->buffer_size-pos) space=s->buffer_size-pos;
 158
 159 //  if(space>32768) space=32768; // limit one-time block size
 160   if(space>4*s->sector_size) space=4*s->sector_size;
 161
 162 //  if(s->seek_lock) return 0; // FIXME
 163
 164 #if 1
 165   // back+newb+space <= buffer_size
 166   back2=s->buffer_size-(space+newb); // max back size
 167   if(s->min_filepos<(read-back2)) s->min_filepos=read-back2;
 168 #else
 169   s->min_filepos=read-back; // avoid seeking-back to temp area...
 170 #endif
 171
 172   // ....
 173   //printf("Buffer fill: %d bytes of %d\n",space,s->buffer_size);
 174   //len=stream_fill_buffer(s->stream);
 175   //memcpy(&s->buffer[pos],s->stream->buffer,len); // avoid this extra copy!
 176   // ....
 177   len=stream_read(s->stream,&s->buffer[pos],space);
 178   if(!len) s->eof=1;
 179
 180   s->max_filepos+=len;
 181   if(pos+len>=s->buffer_size){
 182       // wrap...
 183       s->offset+=s->buffer_size;
 184   }
 185
 186   return len;
 187
 188 }
 189
 190 cache_vars_t* cache_init(int size,int sector){
 191   int num;
 192 #ifndef WIN32
 193   cache_vars_t* s=shmem_alloc(sizeof(cache_vars_t));
 194 #else
 195   cache_vars_t* s=malloc(sizeof(cache_vars_t));
 196 #endif
 197   if(s==NULL) return NULL;
 198
 199   memset(s,0,sizeof(cache_vars_t));
 200   num=size/sector;
 201   if(num < 16){
 202      num = 16;
 203   }//32kb min_size
 204   s->buffer_size=num*sector;
 205   s->sector_size=sector;
 206 #ifndef WIN32
 207   s->buffer=shmem_alloc(s->buffer_size);
 208 #else
 209   s->buffer=malloc(s->buffer_size);
 210 #endif
 211
 212   if(s->buffer == NULL){
 213 #ifndef WIN32
 214     shmem_free(s,sizeof(cache_vars_t));
 215 #else
 216     free(s);
 217 #endif
 218     return NULL;
 219   }
 220
 221   s->fill_limit=8*sector;
 222   s->back_size=s->buffer_size/2;
 223   return s;
 224 }
 225
 226 void cache_uninit(stream_t *s) {
 227   cache_vars_t* c = s->cache_data;
 228   if(!s->cache_pid) return;
 229 #ifndef WIN32
 230   kill(s->cache_pid,SIGKILL);
 231   waitpid(s->cache_pid,NULL,0);
 232 #else
 233   TerminateThread((HANDLE)s->cache_pid,0);
 234   free(c->stream);
 235 #endif
 236   if(!c) return;
 237 #ifndef WIN32
 238   shmem_free(c->buffer,c->buffer_size);
 239   shmem_free(s->cache_data,sizeof(cache_vars_t));
 240 #else
 241   free(c->buffer);
 242   free(s->cache_data);
 243 #endif
 244 }
 245
 246 static void exit_sighandler(int x){
 247   // close stream
 248   exit(0);
 249 }
 250
 251 int stream_enable_cache(stream_t *stream,int size,int min,int seek_limit){
 252   int ss=(stream->type==STREAMTYPE_VCD)?VCD_SECTOR_DATA:STREAM_BUFFER_SIZE;
 253   cache_vars_t* s;
 254
 255   if (stream->type==STREAMTYPE_STREAM && stream->fd < 0) {
 256     // The stream has no 'fd' behind it, so is non-cacheable
 257     mp_msg(MSGT_CACHE,MSGL_STATUS,"\rThis stream is non-cacheable\n");
 258     return 1;
 259   }
 260
 261   s=cache_init(size,ss);
 262   if(s == NULL) return 0;
 263   stream->cache_data=s;
 264   s->stream=stream; // callback
 265   s->seek_limit=seek_limit;
 266
 267
 268   //make sure that we won't wait from cache_fill
 269   //more data than it is alowed to fill
 270   if (s->seek_limit > s->buffer_size - s->fill_limit ){
 271      s->seek_limit = s->buffer_size - s->fill_limit;
 272   }
 273   if (min > s->buffer_size - s->fill_limit) {
 274      min = s->buffer_size - s->fill_limit;
 275   }
 276
 277 #ifndef WIN32
 278   if((stream->cache_pid=fork())){
 279 #else
 280   {
 281     DWORD threadId;
 282     stream_t* stream2=malloc(sizeof(stream_t));
 283     memcpy(stream2,s->stream,sizeof(stream_t));
 284     s->stream=stream2;
 285     stream->cache_pid = CreateThread(NULL,0,ThreadProc,s,0,&threadId);
 286 #endif
 287     // wait until cache is filled at least prefill_init %
 288     mp_msg(MSGT_CACHE,MSGL_V,"CACHE_PRE_INIT: %"PRId64" [%"PRId64"] %"PRId64"  pre:%d  eof:%d  \n",
 289         (int64_t)s->min_filepos,(int64_t)s->read_filepos,(int64_t)s->max_filepos,min,s->eof);
 290     while(s->read_filepos<s->min_filepos || s->max_filepos-s->read_filepos<min){
 291         mp_msg(MSGT_CACHE,MSGL_STATUS,MSGTR_CacheFill,
 292             100.0*(float)(s->max_filepos-s->read_filepos)/(float)(s->buffer_size),
 293             (int64_t)s->max_filepos-s->read_filepos
 294         );
 295         if(s->eof) break; // file is smaller than prefill size
 296         if(mp_input_check_interrupt(PREFILL_SLEEP_TIME))
 297           return 0;
 298     }
 299     mp_msg(MSGT_CACHE,MSGL_STATUS,"\n");
 300     return 1; // parent exits
 301   }
 302
 303 #ifdef WIN32
 304 }
 305 static DWORD WINAPI ThreadProc(void*s){
 306 #endif
 307
 308 // cache thread mainloop:
 309   signal(SIGTERM,exit_sighandler); // kill
 310   while(1){
 311     if(!cache_fill((cache_vars_t*)s)){
 312          usec_sleep(FILL_USLEEP_TIME); // idle
 313     }
 314 //       cache_stats(s->cache_data);
 315   }
 316 }
 317
 318 int cache_stream_fill_buffer(stream_t *s){
 319   int len;
 320   if(s->eof){ s->buf_pos=s->buf_len=0; return 0; }
 321   if(!s->cache_pid) return stream_fill_buffer(s);
 322
 323 //  cache_stats(s->cache_data);
 324
 325   if(s->pos!=((cache_vars_t*)s->cache_data)->read_filepos) mp_msg(MSGT_CACHE,MSGL_ERR,"!!! read_filepos differs!!! report this bug...\n");
 326
 327   len=cache_read(s->cache_data,s->buffer, ((cache_vars_t*)s->cache_data)->sector_size);
 328   //printf("cache_stream_fill_buffer->read -> %d\n",len);
 329
 330   if(len<=0){ s->eof=1; s->buf_pos=s->buf_len=0; return 0; }
 331   s->buf_pos=0;
 332   s->buf_len=len;
 333   s->pos+=len;
 334 //  printf("[%d]",len);fflush(stdout);
 335   return len;
 336
 337 }
 338
 339 int cache_stream_seek_long(stream_t *stream,off_t pos){
 340   cache_vars_t* s;
 341   off_t newpos;
 342   if(!stream->cache_pid) return stream_seek_long(stream,pos);
 343
 344   s=stream->cache_data;
 345 //  s->seek_lock=1;
 346
 347   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);
 348
 349   newpos=pos/s->sector_size; newpos*=s->sector_size; // align
 350   stream->pos=s->read_filepos=newpos;
 351   s->eof=0; // !!!!!!!
 352
 353   cache_stream_fill_buffer(stream);
 354
 355   pos-=newpos;
 356   if(pos>=0 && pos<=stream->buf_len){
 357     stream->buf_pos=pos; // byte position in sector
 358     return 1;
 359   }
 360
 361 //  stream->buf_pos=stream->buf_len=0;
 362 //  return 1;
 363
 364   mp_msg(MSGT_CACHE,MSGL_V,"cache_stream_seek: WARNING! Can't seek to 0x%"PRIX64" !\n",(int64_t)(pos+newpos));
 365   return 0;
 366 }