2 * This file is part of MPlayer.
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.
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.
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.
21 // Initial draft of my new cache system...
22 // Note it runs in 2 processes (using fork()), but doesn't require locking!!
23 // TODO: seeking, data consistency checking
25 #define READ_SLEEP_TIME 10
26 // These defines are used to reduce the cost of many successive
27 // seeks (e.g. when a file has no index) by spinning quickly at first.
28 #define INITIAL_FILL_USLEEP_TIME 1000
29 #define INITIAL_FILL_USLEEP_COUNT 10
30 #define FILL_USLEEP_TIME 50000
31 #define PREFILL_SLEEP_TIME 200
32 #define CONTROL_SLEEP_TIME 0
38 #include <sys/types.h>
42 #include "libavutil/avutil.h"
43 #include "osdep/shmem.h"
44 #include "osdep/timer.h"
45 #if defined(__MINGW32__)
47 static void ThreadProc( void *s
);
48 #elif defined(__OS2__)
51 static void ThreadProc( void *s
);
52 #elif defined(PTHREAD_CACHE)
54 static void *ThreadProc(void *s
);
57 #define FORKED_CACHE 1
60 #define FORKED_CACHE 0
70 unsigned char *buffer
; // base pointer of the allocated buffer memory
71 int buffer_size
; // size of the allocated buffer memory
72 int sector_size
; // size of a single sector (2048/2324)
73 int back_size
; // we should keep back_size amount of old bytes for backward seek
74 int fill_limit
; // we should fill buffer only if space>=fill_limit
75 int seek_limit
; // keep filling cache if distance is less that seek limit
78 off_t min_filepos
; // buffer contain only a part of the file, from min-max pos
80 off_t offset
; // filepos <-> bufferpos offset value (filepos of the buffer's first byte)
84 // int seek_lock; // 1 if we will seek/reset buffer, 2 if we are ready for cmd
85 // int fifo_flag; // 1 if we should use FIFO to notice cache about buffer reads.
89 volatile unsigned control_uint_arg
;
90 volatile double control_double_arg
;
91 volatile int control_res
;
92 volatile off_t control_new_pos
;
93 volatile double stream_time_length
;
96 static int min_fill
=0;
98 int cache_fill_status
=0;
100 static void cache_wakeup(stream_t
*s
)
103 // signal process to wake up immediately
104 kill(s
->cache_pid
, SIGUSR1
);
108 static int cache_read(cache_vars_t
*s
, unsigned char *buf
, int size
)
112 int last_max
= s
->max_filepos
;
116 //printf("CACHE2_READ: 0x%X <= 0x%X <= 0x%X \n",s->min_filepos,s->read_filepos,s->max_filepos);
118 if(s
->read_filepos
>=s
->max_filepos
|| s
->read_filepos
<s
->min_filepos
){
121 if (s
->max_filepos
== last_max
) {
122 if (sleep_count
++ == 10)
123 mp_msg(MSGT_CACHE
, MSGL_WARN
, "Cache not filling!\n");
125 last_max
= s
->max_filepos
;
128 // waiting for buffer fill...
129 if (stream_check_interrupt(READ_SLEEP_TIME
)) {
133 continue; // try again...
137 newb
=s
->max_filepos
-s
->read_filepos
; // new bytes in the buffer
138 if(newb
<min_fill
) min_fill
=newb
; // statistics...
140 // printf("*** newb: %d bytes ***\n",newb);
142 pos
=s
->read_filepos
- s
->offset
;
143 if(pos
<0) pos
+=s
->buffer_size
; else
144 if(pos
>=s
->buffer_size
) pos
-=s
->buffer_size
;
146 if(newb
>s
->buffer_size
-pos
) newb
=s
->buffer_size
-pos
; // handle wrap...
147 if(newb
>size
) newb
=size
;
150 if(s
->read_filepos
<s
->min_filepos
) mp_msg(MSGT_CACHE
,MSGL_ERR
,"Ehh. s->read_filepos<s->min_filepos !!! Report bug...\n");
152 // len=write(mem,newb)
153 //printf("Buffer read: %d bytes\n",newb);
154 memcpy(buf
,&s
->buffer
[pos
],newb
);
159 s
->read_filepos
+=len
;
164 cache_fill_status
=(s
->max_filepos
-s
->read_filepos
)/(s
->buffer_size
/ 100);
168 static int cache_fill(cache_vars_t
*s
)
170 int back
,back2
,newb
,space
,len
,pos
;
171 off_t read
=s
->read_filepos
;
174 if(read
<s
->min_filepos
|| read
>s
->max_filepos
){
176 mp_msg(MSGT_CACHE
,MSGL_DBG2
,"Out of boundaries... seeking to 0x%"PRIX64
" \n",(int64_t)read
);
177 // drop cache contents only if seeking backward or too much fwd.
178 // This is also done for on-disk files, since it loses the backseek cache.
179 // That in turn can cause major bandwidth increase and performance
180 // issues with e.g. mov or badly interleaved files
181 if(read
<s
->min_filepos
|| read
>=s
->max_filepos
+s
->seek_limit
)
183 s
->offset
= // FIXME!?
184 s
->min_filepos
=s
->max_filepos
=read
; // drop cache content :(
185 if(s
->stream
->eof
) stream_reset(s
->stream
);
186 stream_seek_internal(s
->stream
,read
);
187 mp_msg(MSGT_CACHE
,MSGL_DBG2
,"Seek done. new pos: 0x%"PRIX64
" \n",(int64_t)stream_tell(s
->stream
));
191 // calc number of back-bytes:
192 back
=read
- s
->min_filepos
;
193 if(back
<0) back
=0; // strange...
194 if(back
>s
->back_size
) back
=s
->back_size
;
196 // calc number of new bytes:
197 newb
=s
->max_filepos
- read
;
198 if(newb
<0) newb
=0; // strange...
200 // calc free buffer space:
201 space
=s
->buffer_size
- (newb
+back
);
204 pos
=s
->max_filepos
- s
->offset
;
205 if(pos
>=s
->buffer_size
) pos
-=s
->buffer_size
; // wrap-around
207 if(space
<s
->fill_limit
){
208 // printf("Buffer is full (%d bytes free, limit: %d)\n",space,s->fill_limit);
209 return 0; // no fill...
212 // printf("### read=0x%X back=%d newb=%d space=%d pos=%d\n",read,back,newb,space,pos);
214 // reduce space if needed:
215 if(space
>s
->buffer_size
-pos
) space
=s
->buffer_size
-pos
;
217 // limit one-time block size
218 read_chunk
= s
->stream
->read_chunk
;
219 if (!read_chunk
) read_chunk
= 4*s
->sector_size
;
220 space
= FFMIN(space
, read_chunk
);
223 // back+newb+space <= buffer_size
224 back2
=s
->buffer_size
-(space
+newb
); // max back size
225 if(s
->min_filepos
<(read
-back2
)) s
->min_filepos
=read
-back2
;
227 s
->min_filepos
=read
-back
; // avoid seeking-back to temp area...
230 len
= stream_read_internal(s
->stream
, &s
->buffer
[pos
], space
);
234 if(pos
+len
>=s
->buffer_size
){
236 s
->offset
+=s
->buffer_size
;
243 static int cache_execute_control(cache_vars_t
*s
) {
244 static unsigned last
;
245 int quit
= s
->control
== -2;
246 if (quit
|| !s
->stream
->control
) {
247 s
->stream_time_length
= 0;
248 s
->control_new_pos
= 0;
249 s
->control_res
= STREAM_UNSUPPORTED
;
253 if (GetTimerMS() - last
> 99) {
255 if (s
->stream
->control(s
->stream
, STREAM_CTRL_GET_TIME_LENGTH
, &len
) == STREAM_OK
)
256 s
->stream_time_length
= len
;
258 s
->stream_time_length
= 0;
261 if (s
->control
== -1) return 1;
262 switch (s
->control
) {
263 case STREAM_CTRL_GET_CURRENT_TIME
:
264 case STREAM_CTRL_SEEK_TO_TIME
:
265 case STREAM_CTRL_GET_ASPECT_RATIO
:
266 s
->control_res
= s
->stream
->control(s
->stream
, s
->control
, &s
->control_double_arg
);
268 case STREAM_CTRL_SEEK_TO_CHAPTER
:
269 case STREAM_CTRL_GET_NUM_CHAPTERS
:
270 case STREAM_CTRL_GET_CURRENT_CHAPTER
:
271 case STREAM_CTRL_GET_NUM_ANGLES
:
272 case STREAM_CTRL_GET_ANGLE
:
273 case STREAM_CTRL_SET_ANGLE
:
274 s
->control_res
= s
->stream
->control(s
->stream
, s
->control
, &s
->control_uint_arg
);
277 s
->control_res
= STREAM_UNSUPPORTED
;
280 s
->control_new_pos
= s
->stream
->pos
;
285 static void *shared_alloc(int size
) {
287 return shmem_alloc(size
);
293 static void shared_free(void *ptr
, int size
) {
295 shmem_free(ptr
, size
);
301 static cache_vars_t
* cache_init(int size
,int sector
){
303 cache_vars_t
* s
=shared_alloc(sizeof(cache_vars_t
));
304 if(s
==NULL
) return NULL
;
306 memset(s
,0,sizeof(cache_vars_t
));
311 s
->buffer_size
=num
*sector
;
312 s
->sector_size
=sector
;
313 s
->buffer
=shared_alloc(s
->buffer_size
);
315 if(s
->buffer
== NULL
){
316 shared_free(s
, sizeof(cache_vars_t
));
320 s
->fill_limit
=8*sector
;
321 s
->back_size
=s
->buffer_size
/2;
325 void cache_uninit(stream_t
*s
) {
326 cache_vars_t
* c
= s
->cache_data
;
329 cache_do_control(s
, -2, NULL
);
331 kill(s
->cache_pid
,SIGKILL
);
332 waitpid(s
->cache_pid
,NULL
,0);
337 shared_free(c
->buffer
, c
->buffer_size
);
340 shared_free(s
->cache_data
, sizeof(cache_vars_t
));
341 s
->cache_data
= NULL
;
344 static void exit_sighandler(int x
){
349 static void dummy_sighandler(int x
) {
353 * Main loop of the cache process or thread.
355 static void cache_mainloop(cache_vars_t
*s
) {
358 struct sigaction sa
= { .sa_handler
= SIG_IGN
};
359 sigaction(SIGUSR1
, &sa
, NULL
);
362 if (!cache_fill(s
)) {
364 // Let signal wake us up, we cannot leave this
365 // enabled since we do not handle EINTR in most places.
366 // This might need extra code to work on BSD.
367 sa
.sa_handler
= dummy_sighandler
;
368 sigaction(SIGUSR1
, &sa
, NULL
);
370 if (sleep_count
< INITIAL_FILL_USLEEP_COUNT
) {
372 usec_sleep(INITIAL_FILL_USLEEP_TIME
);
374 usec_sleep(FILL_USLEEP_TIME
); // idle
376 sa
.sa_handler
= SIG_IGN
;
377 sigaction(SIGUSR1
, &sa
, NULL
);
381 } while (cache_execute_control(s
));
385 * \return 1 on success, 0 if the function was interrupted and -1 on error
387 int stream_enable_cache(stream_t
*stream
,int size
,int min
,int seek_limit
){
388 int ss
= stream
->sector_size
? stream
->sector_size
: STREAM_BUFFER_SIZE
;
392 if (stream
->flags
& STREAM_NON_CACHEABLE
) {
393 mp_msg(MSGT_CACHE
,MSGL_STATUS
,"\rThis stream is non-cacheable\n");
397 s
=cache_init(size
,ss
);
398 if(s
== NULL
) return -1;
399 stream
->cache_data
=s
;
400 s
->stream
=stream
; // callback
401 s
->seek_limit
=seek_limit
;
404 //make sure that we won't wait from cache_fill
405 //more data than it is allowed to fill
406 if (s
->seek_limit
> s
->buffer_size
- s
->fill_limit
){
407 s
->seek_limit
= s
->buffer_size
- s
->fill_limit
;
409 if (min
> s
->buffer_size
- s
->fill_limit
) {
410 min
= s
->buffer_size
- s
->fill_limit
;
412 // to make sure we wait for the cache process/thread to be active
418 if((stream
->cache_pid
=fork())){
419 if ((pid_t
)stream
->cache_pid
== -1)
420 stream
->cache_pid
= 0;
423 stream_t
* stream2
=malloc(sizeof(stream_t
));
424 memcpy(stream2
,s
->stream
,sizeof(stream_t
));
426 #if defined(__MINGW32__)
427 stream
->cache_pid
= _beginthread( ThreadProc
, 0, s
);
428 #elif defined(__OS2__)
429 stream
->cache_pid
= _beginthread( ThreadProc
, NULL
, 256 * 1024, s
);
433 pthread_create(&tid
, NULL
, ThreadProc
, s
);
434 stream
->cache_pid
= 1;
438 if (!stream
->cache_pid
) {
439 mp_msg(MSGT_CACHE
, MSGL_ERR
,
440 "Starting cache process/thread failed: %s.\n", strerror(errno
));
443 // wait until cache is filled at least prefill_init %
444 mp_msg(MSGT_CACHE
,MSGL_V
,"CACHE_PRE_INIT: %"PRId64
" [%"PRId64
"] %"PRId64
" pre:%d eof:%d \n",
445 (int64_t)s
->min_filepos
,(int64_t)s
->read_filepos
,(int64_t)s
->max_filepos
,min
,s
->eof
);
446 while(s
->read_filepos
<s
->min_filepos
|| s
->max_filepos
-s
->read_filepos
<min
){
447 mp_tmsg(MSGT_CACHE
,MSGL_STATUS
,"\rCache fill: %5.2f%% (%"PRId64
" bytes) ",
448 100.0*(float)(s
->max_filepos
-s
->read_filepos
)/(float)(s
->buffer_size
),
449 (int64_t)s
->max_filepos
-s
->read_filepos
451 if(s
->eof
) break; // file is smaller than prefill size
452 if(stream_check_interrupt(PREFILL_SLEEP_TIME
)) {
457 mp_msg(MSGT_CACHE
,MSGL_STATUS
,"\n");
458 return 1; // parent exits
461 cache_uninit(stream
);
466 signal(SIGTERM
,exit_sighandler
); // kill
468 // make sure forked code never leaves this function
474 #if defined(__MINGW32__) || defined(__OS2__)
475 static void ThreadProc( void *s
){
480 static void *ThreadProc( void *s
){
487 int cache_stream_fill_buffer(stream_t
*s
){
490 if(!s
->cache_pid
) return stream_fill_buffer(s
);
492 if(s
->pos
!=((cache_vars_t
*)s
->cache_data
)->read_filepos
) mp_msg(MSGT_CACHE
,MSGL_ERR
,"!!! read_filepos differs!!! report this bug...\n");
493 sector_size
= ((cache_vars_t
*)s
->cache_data
)->sector_size
;
494 if (sector_size
> STREAM_MAX_SECTOR_SIZE
) {
495 mp_msg(MSGT_CACHE
, MSGL_ERR
, "Sector size %i larger than maximum %i\n", sector_size
, STREAM_MAX_SECTOR_SIZE
);
496 sector_size
= STREAM_MAX_SECTOR_SIZE
;
499 len
=cache_read(s
->cache_data
,s
->buffer
, sector_size
);
500 //printf("cache_stream_fill_buffer->read -> %d\n",len);
502 if(len
<=0){ s
->eof
=1; s
->buf_pos
=s
->buf_len
=0; return 0; }
507 // printf("[%d]",len);fflush(stdout);
509 stream_capture_do(s
);
514 int cache_stream_seek_long(stream_t
*stream
,off_t pos
){
517 if(!stream
->cache_pid
) return stream_seek_long(stream
,pos
);
519 s
=stream
->cache_data
;
522 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
);
524 newpos
=pos
/s
->sector_size
; newpos
*=s
->sector_size
; // align
525 stream
->pos
=s
->read_filepos
=newpos
;
527 cache_wakeup(stream
);
529 cache_stream_fill_buffer(stream
);
532 if(pos
>=0 && pos
<=stream
->buf_len
){
533 stream
->buf_pos
=pos
; // byte position in sector
537 // stream->buf_pos=stream->buf_len=0;
540 mp_msg(MSGT_CACHE
,MSGL_V
,"cache_stream_seek: WARNING! Can't seek to 0x%"PRIX64
" !\n",(int64_t)(pos
+newpos
));
544 int cache_do_control(stream_t
*stream
, int cmd
, void *arg
) {
546 cache_vars_t
* s
= stream
->cache_data
;
548 case STREAM_CTRL_SEEK_TO_TIME
:
549 s
->control_double_arg
= *(double *)arg
;
552 case STREAM_CTRL_SEEK_TO_CHAPTER
:
553 case STREAM_CTRL_SET_ANGLE
:
554 s
->control_uint_arg
= *(unsigned *)arg
;
557 // the core might call these every frame, they are too slow for this...
558 case STREAM_CTRL_GET_TIME_LENGTH
:
559 // case STREAM_CTRL_GET_CURRENT_TIME:
560 *(double *)arg
= s
->stream_time_length
;
561 return s
->stream_time_length
? STREAM_OK
: STREAM_UNSUPPORTED
;
562 case STREAM_CTRL_GET_NUM_CHAPTERS
:
563 case STREAM_CTRL_GET_CURRENT_CHAPTER
:
564 case STREAM_CTRL_GET_ASPECT_RATIO
:
565 case STREAM_CTRL_GET_NUM_ANGLES
:
566 case STREAM_CTRL_GET_ANGLE
:
571 return STREAM_UNSUPPORTED
;
573 cache_wakeup(stream
);
574 while (s
->control
!= -1) {
575 if (sleep_count
++ == 1000)
576 mp_msg(MSGT_CACHE
, MSGL_WARN
, "Cache not responding!\n");
577 if (stream_check_interrupt(CONTROL_SLEEP_TIME
)) {
579 return STREAM_UNSUPPORTED
;
583 case STREAM_CTRL_GET_TIME_LENGTH
:
584 case STREAM_CTRL_GET_CURRENT_TIME
:
585 case STREAM_CTRL_GET_ASPECT_RATIO
:
586 *(double *)arg
= s
->control_double_arg
;
588 case STREAM_CTRL_GET_NUM_CHAPTERS
:
589 case STREAM_CTRL_GET_CURRENT_CHAPTER
:
590 case STREAM_CTRL_GET_NUM_ANGLES
:
591 case STREAM_CTRL_GET_ANGLE
:
592 *(unsigned *)arg
= s
->control_uint_arg
;
594 case STREAM_CTRL_SEEK_TO_CHAPTER
:
595 case STREAM_CTRL_SEEK_TO_TIME
:
596 case STREAM_CTRL_SET_ANGLE
:
597 if (s
->control_res
!= STREAM_UNSUPPORTED
)
598 stream
->pos
= s
->read_filepos
= s
->control_new_pos
;
601 return s
->control_res
;