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mpv/stream/cache2.c

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/*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
// Initial draft of my new cache system...
// Note it runs in 2 processes (using fork()), but doesn't require locking!!
// TODO: seeking, data consistency checking
#define READ_SLEEP_TIME 10
// These defines are used to reduce the cost of many successive
// seeks (e.g. when a file has no index) by spinning quickly at first.
#define INITIAL_FILL_USLEEP_TIME 1000
#define INITIAL_FILL_USLEEP_COUNT 10
#define FILL_USLEEP_TIME 50000
#define PREFILL_SLEEP_TIME 200
#define CONTROL_SLEEP_TIME 0
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <libavutil/common.h>
#include "config.h"
#include "osdep/shmem.h"
#include "osdep/timer.h"
#if defined(__MINGW32__)
#include <windows.h>
static void ThreadProc( void *s );
#elif defined(PTHREAD_CACHE)
#include <pthread.h>
static void *ThreadProc(void *s);
#else
#include <sys/wait.h>
#define FORKED_CACHE 1
#endif
#ifndef FORKED_CACHE
#define FORKED_CACHE 0
#endif
#include "mp_msg.h"
#include "stream.h"
#include "cache2.h"
#include "mpcommon.h"
typedef struct {
// constats:
unsigned char *buffer; // base pointer of the allocated buffer memory
int64_t buffer_size; // size of the allocated buffer memory
int sector_size; // size of a single sector (2048/2324)
int64_t back_size; // we should keep back_size amount of old bytes for backward seek
int64_t fill_limit; // we should fill buffer only if space>=fill_limit
int64_t seek_limit; // keep filling cache if distance is less that seek limit
#if FORKED_CACHE
pid_t ppid; // parent PID to detect killed parent
#endif
// filler's pointers:
int eof;
int64_t min_filepos; // buffer contain only a part of the file, from min-max pos
int64_t max_filepos;
int64_t offset; // filepos <-> bufferpos offset value (filepos of the buffer's first byte)
// reader's pointers:
int64_t read_filepos;
// commands/locking:
// int seek_lock; // 1 if we will seek/reset buffer, 2 if we are ready for cmd
// int fifo_flag; // 1 if we should use FIFO to notice cache about buffer reads.
// callback
stream_t* stream;
volatile int control;
volatile unsigned control_uint_arg;
volatile double control_double_arg;
volatile struct stream_lang_req control_lang_arg;
volatile int control_res;
volatile double stream_time_length;
volatile double stream_time_pos;
} cache_vars_t;
static void cache_wakeup(stream_t *s)
{
#if FORKED_CACHE
// signal process to wake up immediately
kill(s->cache_pid, SIGUSR1);
#endif
}
static void cache_flush(cache_vars_t *s)
{
s->offset= // FIXME!?
s->min_filepos=s->max_filepos=s->read_filepos; // drop cache content :(
}
static int cache_read(cache_vars_t *s, unsigned char *buf, int size)
{
int total=0;
int sleep_count = 0;
int64_t last_max = s->max_filepos;
while(size>0){
int64_t pos,newb,len;
//printf("CACHE2_READ: 0x%X <= 0x%X <= 0x%X \n",s->min_filepos,s->read_filepos,s->max_filepos);
if(s->read_filepos>=s->max_filepos || s->read_filepos<s->min_filepos){
// eof?
if(s->eof) break;
if (s->max_filepos == last_max) {
if (sleep_count++ == 10)
mp_msg(MSGT_CACHE, MSGL_WARN, "Cache empty, consider increasing -cache and/or -cache-min. [performance issue]\n");
} else {
last_max = s->max_filepos;
sleep_count = 0;
}
// waiting for buffer fill...
if (stream_check_interrupt(READ_SLEEP_TIME)) {
s->eof = 1;
break;
}
continue; // try again...
}
sleep_count = 0;
newb=s->max_filepos-s->read_filepos; // new bytes in the buffer
// printf("*** newb: %d bytes ***\n",newb);
pos=s->read_filepos - s->offset;
if(pos<0) pos+=s->buffer_size; else
if(pos>=s->buffer_size) pos-=s->buffer_size;
if(newb>s->buffer_size-pos) newb=s->buffer_size-pos; // handle wrap...
if(newb>size) newb=size;
// check:
if(s->read_filepos<s->min_filepos) mp_msg(MSGT_CACHE,MSGL_ERR,"Ehh. s->read_filepos<s->min_filepos !!! Report bug...\n");
// len=write(mem,newb)
//printf("Buffer read: %d bytes\n",newb);
memcpy(buf,&s->buffer[pos],newb);
buf+=newb;
len=newb;
// ...
s->read_filepos+=len;
size-=len;
total+=len;
}
return total;
}
static int cache_fill(cache_vars_t *s)
{
int64_t back,back2,newb,space,len,pos;
int64_t read=s->read_filepos;
int read_chunk;
int wraparound_copy = 0;
if(read<s->min_filepos || read>s->max_filepos){
// seek...
mp_msg(MSGT_CACHE,MSGL_DBG2,"Out of boundaries... seeking to 0x%"PRIX64" \n",read);
// drop cache contents only if seeking backward or too much fwd.
// This is also done for on-disk files, since it loses the backseek cache.
// That in turn can cause major bandwidth increase and performance
// issues with e.g. mov or badly interleaved files
if(read<s->min_filepos || read>=s->max_filepos+s->seek_limit)
{
cache_flush(s);
if(s->stream->eof) stream_reset(s->stream);
stream_seek_internal(s->stream,read);
mp_msg(MSGT_CACHE,MSGL_DBG2,"Seek done. new pos: 0x%"PRIX64" \n",(int64_t)stream_tell(s->stream));
}
}
// calc number of back-bytes:
back=read - s->min_filepos;
if(back<0) back=0; // strange...
if(back>s->back_size) back=s->back_size;
// calc number of new bytes:
newb=s->max_filepos - read;
if(newb<0) newb=0; // strange...
// calc free buffer space:
space=s->buffer_size - (newb+back);
// calc bufferpos:
pos=s->max_filepos - s->offset;
if(pos>=s->buffer_size) pos-=s->buffer_size; // wrap-around
if(space<s->fill_limit){
// printf("Buffer is full (%d bytes free, limit: %d)\n",space,s->fill_limit);
return 0; // no fill...
}
// printf("### read=0x%X back=%d newb=%d space=%d pos=%d\n",read,back,newb,space,pos);
// try to avoid wrap-around. If not possible due to sector size
// do an extra copy.
if(space>s->buffer_size-pos) {
if (s->buffer_size-pos >= s->sector_size) {
space=s->buffer_size-pos;
} else {
space = s->sector_size;
wraparound_copy = 1;
}
}
// limit one-time block size
read_chunk = s->stream->read_chunk;
if (!read_chunk) read_chunk = 4*s->sector_size;
space = FFMIN(space, read_chunk);
#if 1
// back+newb+space <= buffer_size
back2=s->buffer_size-(space+newb); // max back size
if(s->min_filepos<(read-back2)) s->min_filepos=read-back2;
#else
s->min_filepos=read-back; // avoid seeking-back to temp area...
#endif
if (wraparound_copy) {
int to_copy;
len = stream_read_internal(s->stream, s->stream->buffer, space);
to_copy = FFMIN(len, s->buffer_size-pos);
memcpy(s->buffer + pos, s->stream->buffer, to_copy);
memcpy(s->buffer, s->stream->buffer + to_copy, len - to_copy);
} else
len = stream_read_internal(s->stream, &s->buffer[pos], space);
s->eof= !len;
s->max_filepos+=len;
if(pos+len>=s->buffer_size){
// wrap...
s->offset+=s->buffer_size;
}
return len;
}
static int cache_execute_control(cache_vars_t *s) {
double double_res;
unsigned uint_res;
int needs_flush = 0;
static unsigned last;
int quit = s->control == -2;
uint64_t old_pos = s->stream->pos;
int old_eof = s->stream->eof;
if (quit || !s->stream->control) {
s->stream_time_length = 0;
s->stream_time_pos = MP_NOPTS_VALUE;
s->control_res = STREAM_UNSUPPORTED;
s->control = -1;
return !quit;
}
if (GetTimerMS() - last > 99) {
double len, pos;
if (s->stream->control(s->stream, STREAM_CTRL_GET_TIME_LENGTH, &len) == STREAM_OK)
s->stream_time_length = len;
else
s->stream_time_length = 0;
if (s->stream->control(s->stream, STREAM_CTRL_GET_CURRENT_TIME, &pos) == STREAM_OK)
s->stream_time_pos = pos;
else
s->stream_time_pos = MP_NOPTS_VALUE;
#if FORKED_CACHE
// if parent PID changed, main process was killed -> exit
if (s->ppid != getppid()) {
mp_msg(MSGT_CACHE, MSGL_WARN, "Parent process disappeared, exiting cache process.\n");
return 0;
}
#endif
last = GetTimerMS();
}
if (s->control == -1) return 1;
switch (s->control) {
case STREAM_CTRL_SEEK_TO_TIME:
needs_flush = 1;
double_res = s->control_double_arg;
case STREAM_CTRL_GET_CURRENT_TIME:
case STREAM_CTRL_GET_ASPECT_RATIO:
s->control_res = s->stream->control(s->stream, s->control, &double_res);
s->control_double_arg = double_res;
break;
case STREAM_CTRL_SEEK_TO_CHAPTER:
case STREAM_CTRL_SET_ANGLE:
needs_flush = 1;
uint_res = s->control_uint_arg;
case STREAM_CTRL_GET_NUM_CHAPTERS:
case STREAM_CTRL_GET_CURRENT_CHAPTER:
case STREAM_CTRL_GET_NUM_ANGLES:
case STREAM_CTRL_GET_ANGLE:
s->control_res = s->stream->control(s->stream, s->control, &uint_res);
s->control_uint_arg = uint_res;
break;
case STREAM_CTRL_GET_LANG:
s->control_res = s->stream->control(s->stream, s->control, (void *)&s->control_lang_arg);
break;
default:
s->control_res = STREAM_UNSUPPORTED;
break;
}
if (s->control_res == STREAM_OK && needs_flush) {
s->read_filepos = s->stream->pos;
s->eof = s->stream->eof;
cache_flush(s);
} else if (needs_flush &&
(old_pos != s->stream->pos || old_eof != s->stream->eof))
mp_msg(MSGT_STREAM, MSGL_ERR, "STREAM_CTRL changed stream pos but returned error, this is not allowed!\n");
s->control = -1;
return 1;
}
static void *shared_alloc(int64_t size) {
#if FORKED_CACHE
return shmem_alloc(size);
#else
return malloc(size);
#endif
}
static void shared_free(void *ptr, int64_t size) {
#if FORKED_CACHE
shmem_free(ptr, size);
#else
free(ptr);
#endif
}
static cache_vars_t* cache_init(int64_t size,int sector){
int64_t num;
cache_vars_t* s=shared_alloc(sizeof(cache_vars_t));
if(s==NULL) return NULL;
memset(s,0,sizeof(cache_vars_t));
num=size/sector;
if(num < 16){
num = 16;
}//32kb min_size
s->buffer_size=num*sector;
s->sector_size=sector;
s->buffer=shared_alloc(s->buffer_size);
if(s->buffer == NULL){
shared_free(s, sizeof(cache_vars_t));
return NULL;
}
s->fill_limit=8*sector;
s->back_size=s->buffer_size/2;
#if FORKED_CACHE
s->ppid = getpid();
#endif
return s;
}
void cache_uninit(stream_t *s) {
cache_vars_t* c = s->cache_data;
if(s->cache_pid) {
#if !FORKED_CACHE
cache_do_control(s, -2, NULL);
#else
kill(s->cache_pid,SIGKILL);
waitpid(s->cache_pid,NULL,0);
#endif
s->cache_pid = 0;
}
if(!c) return;
shared_free(c->buffer, c->buffer_size);
c->buffer = NULL;
c->stream = NULL;
shared_free(s->cache_data, sizeof(cache_vars_t));
s->cache_data = NULL;
}
#if FORKED_CACHE
static void exit_sighandler(int x){
// close stream
exit(0);
}
static void dummy_sighandler(int x) {
}
#endif
/**
* Main loop of the cache process or thread.
*/
static void cache_mainloop(cache_vars_t *s) {
int sleep_count = 0;
#if FORKED_CACHE
struct sigaction sa = { .sa_handler = SIG_IGN };
sigaction(SIGUSR1, &sa, NULL);
#endif
do {
if (!cache_fill(s)) {
#if FORKED_CACHE
// Let signal wake us up, we cannot leave this
// enabled since we do not handle EINTR in most places.
// This might need extra code to work on BSD.
sa.sa_handler = dummy_sighandler;
sigaction(SIGUSR1, &sa, NULL);
#endif
if (sleep_count < INITIAL_FILL_USLEEP_COUNT) {
sleep_count++;
usec_sleep(INITIAL_FILL_USLEEP_TIME);
} else
usec_sleep(FILL_USLEEP_TIME); // idle
#if FORKED_CACHE
sa.sa_handler = SIG_IGN;
sigaction(SIGUSR1, &sa, NULL);
#endif
} else
sleep_count = 0;
} while (cache_execute_control(s));
}
int stream_enable_cache_percent(stream_t *stream, int64_t stream_cache_size,
float stream_cache_min_percent, float stream_cache_seek_min_percent)
{
return stream_enable_cache(stream, stream_cache_size * 1024,
stream_cache_size * 1024 * (stream_cache_min_percent / 100.0),
stream_cache_size * 1024 * (stream_cache_seek_min_percent / 100.0));
}
/**
* \return 1 on success, 0 if the function was interrupted and -1 on error
*/
int stream_enable_cache(stream_t *stream,int64_t size,int64_t min,int64_t seek_limit){
int ss = stream->sector_size ? stream->sector_size : STREAM_BUFFER_SIZE;
int res = -1;
cache_vars_t* s;
if (size > SIZE_MAX) {
mp_msg(MSGT_CACHE, MSGL_FATAL, "Cache size larger than max. allocation size\n");
return -1;
}
s=cache_init(size,ss);
if(s == NULL) return -1;
stream->cache_data=s;
s->stream=stream; // callback
s->seek_limit=seek_limit;
//make sure that we won't wait from cache_fill
//more data than it is allowed to fill
if (s->seek_limit > s->buffer_size - s->fill_limit ){
s->seek_limit = s->buffer_size - s->fill_limit;
}
if (min > s->buffer_size - s->fill_limit) {
min = s->buffer_size - s->fill_limit;
}
// to make sure we wait for the cache process/thread to be active
// before continuing
if (min <= 0)
min = 1;
#if FORKED_CACHE
if((stream->cache_pid=fork())){
if ((pid_t)stream->cache_pid == -1)
stream->cache_pid = 0;
#else
{
stream_t* stream2=malloc(sizeof(stream_t));
memcpy(stream2,s->stream,sizeof(stream_t));
s->stream=stream2;
#if defined(__MINGW32__)
stream->cache_pid = _beginthread( ThreadProc, 0, s );
#else
{
pthread_t tid;
pthread_create(&tid, NULL, ThreadProc, s);
stream->cache_pid = 1;
}
#endif
#endif
if (!stream->cache_pid) {
mp_msg(MSGT_CACHE, MSGL_ERR,
"Starting cache process/thread failed: %s.\n", strerror(errno));
goto err_out;
}
// wait until cache is filled at least prefill_init %
mp_msg(MSGT_CACHE,MSGL_V,"CACHE_PRE_INIT: %"PRId64" [%"PRId64"] %"PRId64" pre:%"PRId64" eof:%d \n",
s->min_filepos,s->read_filepos,s->max_filepos,min,s->eof);
while(s->read_filepos<s->min_filepos || s->max_filepos-s->read_filepos<min){
mp_tmsg(MSGT_CACHE,MSGL_STATUS,"\rCache fill: %5.2f%% (%"PRId64" bytes) ",
100.0*(float)(s->max_filepos-s->read_filepos)/(float)(s->buffer_size),
s->max_filepos-s->read_filepos
);
if(s->eof) break; // file is smaller than prefill size
if(stream_check_interrupt(PREFILL_SLEEP_TIME)) {
res = 0;
goto err_out;
}
}
mp_msg(MSGT_CACHE,MSGL_STATUS,"\n");
return 1; // parent exits
err_out:
cache_uninit(stream);
return res;
}
#if FORKED_CACHE
signal(SIGTERM,exit_sighandler); // kill
cache_mainloop(s);
// make sure forked code never leaves this function
exit(0);
#endif
}
#if !FORKED_CACHE
#if defined(__MINGW32__)
static void ThreadProc( void *s ){
cache_mainloop(s);
_endthread();
}
#else
static void *ThreadProc( void *s ){
cache_mainloop(s);
return NULL;
}
#endif
#endif
int cache_stream_fill_buffer(stream_t *s){
int len;
int sector_size;
if(!s->cache_pid) return stream_fill_buffer(s);
if(s->pos!=((cache_vars_t*)s->cache_data)->read_filepos) mp_msg(MSGT_CACHE,MSGL_ERR,"!!! read_filepos differs!!! report this bug...\n");
sector_size = ((cache_vars_t*)s->cache_data)->sector_size;
if (sector_size > STREAM_MAX_SECTOR_SIZE) {
mp_msg(MSGT_CACHE, MSGL_ERR, "Sector size %i larger than maximum %i\n", sector_size, STREAM_MAX_SECTOR_SIZE);
sector_size = STREAM_MAX_SECTOR_SIZE;
}
len=cache_read(s->cache_data,s->buffer, sector_size);
//printf("cache_stream_fill_buffer->read -> %d\n",len);
if(len<=0){ s->eof=1; s->buf_pos=s->buf_len=0; return 0; }
s->eof=0;
s->buf_pos=0;
s->buf_len=len;
s->pos+=len;
// printf("[%d]",len);fflush(stdout);
return len;
}
int cache_fill_status(stream_t *s) {
cache_vars_t *cv;
if (!s || !s->cache_data)
return -1;
cv = s->cache_data;
return (cv->max_filepos-cv->read_filepos)/(cv->buffer_size / 100);
}
int cache_stream_seek_long(stream_t *stream,int64_t pos){
cache_vars_t* s;
int64_t newpos;
if(!stream->cache_pid) return stream_seek_long(stream,pos);
s=stream->cache_data;
// s->seek_lock=1;
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);
newpos=pos/s->sector_size; newpos*=s->sector_size; // align
stream->pos=s->read_filepos=newpos;
s->eof=0; // !!!!!!!
cache_wakeup(stream);
cache_stream_fill_buffer(stream);
pos-=newpos;
if(pos>=0 && pos<=stream->buf_len){
stream->buf_pos=pos; // byte position in sector
return 1;
}
// stream->buf_pos=stream->buf_len=0;
// return 1;
mp_msg(MSGT_CACHE,MSGL_V,"cache_stream_seek: WARNING! Can't seek to 0x%"PRIX64" !\n",pos+newpos);
return 0;
}
int cache_do_control(stream_t *stream, int cmd, void *arg) {
int sleep_count = 0;
int pos_change = 0;
cache_vars_t* s = stream->cache_data;
switch (cmd) {
case STREAM_CTRL_SEEK_TO_TIME:
s->control_double_arg = *(double *)arg;
s->control = cmd;
pos_change = 1;
break;
case STREAM_CTRL_SEEK_TO_CHAPTER:
case STREAM_CTRL_SET_ANGLE:
s->control_uint_arg = *(unsigned *)arg;
s->control = cmd;
pos_change = 1;
break;
// the core might call these every frame, so cache them...
case STREAM_CTRL_GET_TIME_LENGTH:
*(double *)arg = s->stream_time_length;
return s->stream_time_length ? STREAM_OK : STREAM_UNSUPPORTED;
case STREAM_CTRL_GET_CURRENT_TIME:
*(double *)arg = s->stream_time_pos;
return s->stream_time_pos != MP_NOPTS_VALUE ? STREAM_OK : STREAM_UNSUPPORTED;
case STREAM_CTRL_GET_LANG:
s->control_lang_arg = *(struct stream_lang_req *)arg;
case STREAM_CTRL_GET_NUM_CHAPTERS:
case STREAM_CTRL_GET_CURRENT_CHAPTER:
case STREAM_CTRL_GET_ASPECT_RATIO:
case STREAM_CTRL_GET_NUM_ANGLES:
case STREAM_CTRL_GET_ANGLE:
case -2:
s->control = cmd;
break;
default:
return STREAM_UNSUPPORTED;
}
cache_wakeup(stream);
while (s->control != -1) {
if (sleep_count++ == 1000)
mp_msg(MSGT_CACHE, MSGL_WARN, "Cache not responding! [performance issue]\n");
if (stream_check_interrupt(CONTROL_SLEEP_TIME)) {
s->eof = 1;
return STREAM_UNSUPPORTED;
}
}
if (s->control_res != STREAM_OK)
return s->control_res;
// We cannot do this on failure, since this would cause the
// stream position to jump when e.g. STREAM_CTRL_SEEK_TO_TIME
// is unsupported - but in that case we need the old value
// to do the fallback seek.
// This unfortunately can lead to slightly different behaviour
// with and without cache if the protocol changes pos even
// when an error happened.
if (pos_change) {
stream->pos = s->read_filepos;
stream->eof = s->eof;
}
switch (cmd) {
case STREAM_CTRL_GET_TIME_LENGTH:
case STREAM_CTRL_GET_CURRENT_TIME:
case STREAM_CTRL_GET_ASPECT_RATIO:
*(double *)arg = s->control_double_arg;
break;
case STREAM_CTRL_GET_NUM_CHAPTERS:
case STREAM_CTRL_GET_CURRENT_CHAPTER:
case STREAM_CTRL_GET_NUM_ANGLES:
case STREAM_CTRL_GET_ANGLE:
*(unsigned *)arg = s->control_uint_arg;
break;
case STREAM_CTRL_GET_LANG:
*(struct stream_lang_req *)arg = s->control_lang_arg;
break;
}
return s->control_res;
}
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