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mpv/stream/cache.c

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
// Time in seconds the main thread waits for the cache thread. On wakeups, the
// code checks for user requested aborts and also prints warnings that the
// cache is being slow.
#define CACHE_WAIT_TIME 1.0
// The time the cache sleeps in idle mode. This controls how often the cache
// retries reading from the stream after EOF has reached (in case the stream is
// actually readable again, for example if data has been appended to a file).
// Note that if this timeout is too low, the player will waste too much CPU
// when player is paused.
#define CACHE_IDLE_SLEEP_TIME 1.0
// Time in seconds the cache updates "cached" controls. Note that idle mode
// will block the cache from doing this, and this timeout is honored only if
// the cache is active.
#define CACHE_UPDATE_CONTROLS_TIME 2.0
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <pthread.h>
#include <time.h>
#include <math.h>
#include <sys/time.h>
#include <libavutil/common.h>
#include "config.h"
#include "osdep/timer.h"
#include "osdep/threads.h"
#include "common/msg.h"
#include "common/tags.h"
#include "options/options.h"
#include "stream.h"
#include "common/common.h"
#define OPT_BASE_STRUCT struct mp_cache_opts
const struct m_sub_options stream_cache_conf = {
.opts = (const struct m_option[]){
OPT_CHOICE_OR_INT("cache", size, 0, 32, 0x7fffffff,
({"no", 0},
{"auto", -1},
{"yes", -2})),
OPT_CHOICE_OR_INT("cache-default", def_size, 0, 32, 0x7fffffff,
({"no", 0})),
OPT_INTRANGE("cache-initial", initial, 0, 0, 0x7fffffff),
OPT_INTRANGE("cache-seek-min", seek_min, 0, 0, 0x7fffffff),
OPT_INTRANGE("cache-backbuffer", back_buffer, 0, 0, 0x7fffffff),
OPT_STRING("cache-file", file, M_OPT_FILE),
OPT_INTRANGE("cache-file-size", file_max, 0, 0, 0x7fffffff),
{0}
},
.size = sizeof(struct mp_cache_opts),
.defaults = &(const struct mp_cache_opts){
.size = -1,
.def_size = 10000,
.initial = 0,
.seek_min = 500,
.back_buffer = 10000,
.file_max = 1024 * 1024,
},
};
// Note: (struct priv*)(cache->priv)->cache == cache
struct priv {
pthread_t cache_thread;
bool cache_thread_running;
pthread_mutex_t mutex;
pthread_cond_t wakeup;
// Constants (as long as cache thread is running)
// Some of these might actually be changed by a synced cache resize.
unsigned char *buffer; // base pointer of the allocated buffer memory
int64_t buffer_size; // size of the allocated buffer memory
int64_t back_size; // keep back_size amount of old bytes for backward seek
int64_t seek_limit; // keep filling cache if distance is less that seek limit
bool seekable; // underlying stream is seekable
struct mp_log *log;
// Owned by the main thread
stream_t *cache; // wrapper stream, used by demuxer etc.
// Owned by the cache thread
stream_t *stream; // "real" stream, used to read from the source media
int64_t bytes_until_wakeup; // wakeup cache thread after this many bytes
// All the following members are shared between the threads.
// You must lock the mutex to access them.
// Ringbuffer
int64_t min_filepos; // range of file that is cached in the buffer
int64_t max_filepos; // ... max_filepos being the last read position
bool eof; // true if max_filepos = EOF
int64_t offset; // buffer[WRAP(s->max_filepos - offset)] corresponds
// to the byte at max_filepos (must be wrapped by
// buffer_size)
bool idle; // cache thread has stopped reading
int64_t reads; // number of actual read attempts performed
int64_t speed_start; // start time (us) for calculating download speed
int64_t speed_amount; // bytes read since speed_start
double speed;
bool enable_readahead; // actively read beyond read() position
int64_t read_filepos; // client read position (mirrors cache->pos)
int64_t read_min; // file position until which the thread should
// read even if readahead is disabled
int64_t eof_pos;
bool read_seek_failed; // let a read fail because an async seek failed
int control; // requested STREAM_CTRL_... or CACHE_CTRL_...
void *control_arg; // temporary for executing STREAM_CTRLs
int control_res;
bool control_flush;
// Cached STREAM_CTRLs
double stream_time_length;
int64_t stream_size;
struct mp_tags *stream_metadata;
double start_pts;
bool has_avseek;
};
enum {
CACHE_CTRL_NONE = 0,
CACHE_CTRL_QUIT = -1,
CACHE_CTRL_PING = -2,
CACHE_CTRL_SEEK = -3,
// we should fill buffer only if space>=FILL_LIMIT
FILL_LIMIT = 16 * 1024,
};
// Used by the main thread to wakeup the cache thread, and to wait for the
// cache thread. The cache mutex has to be locked when calling this function.
// *retry_time should be set to 0 on the first call.
// Return false if the stream has been aborted.
static bool cache_wakeup_and_wait(struct priv *s, double *retry_time)
{
double start = mp_time_sec();
if (*retry_time >= CACHE_WAIT_TIME) {
MP_VERBOSE(s, "Cache is not responding - slow/stuck network connection?\n");
*retry_time = -1; // do not warn again for this call
}
pthread_cond_signal(&s->wakeup);
struct timespec ts = mp_rel_time_to_timespec(CACHE_WAIT_TIME);
pthread_cond_timedwait(&s->wakeup, &s->mutex, &ts);
if (*retry_time >= 0)
*retry_time += mp_time_sec() - start;
return !mp_cancel_test(s->cache->cancel);
}
// Runs in the cache thread
static void cache_drop_contents(struct priv *s)
{
s->offset = s->min_filepos = s->max_filepos = s->read_filepos;
s->eof = false;
s->start_pts = MP_NOPTS_VALUE;
}
static void update_speed(struct priv *s)
{
int64_t now = mp_time_us();
if (s->speed_start + 1000000 <= now) {
s->speed = s->speed_amount * 1e6 / (now - s->speed_start);
s->speed_amount = 0;
s->speed_start = now;
}
}
// Copy at most dst_size from the cache at the given absolute file position pos.
// Return number of bytes that could actually be read.
// Does not advance the file position, or change anything else.
// Can be called from anywhere, as long as the mutex is held.
static size_t read_buffer(struct priv *s, unsigned char *dst,
size_t dst_size, int64_t pos)
{
size_t read = 0;
while (read < dst_size) {
if (pos >= s->max_filepos || pos < s->min_filepos)
break;
int64_t newb = s->max_filepos - pos; // new bytes in the buffer
int64_t bpos = pos - s->offset; // file pos to buffer memory pos
if (bpos < 0) {
bpos += s->buffer_size;
} else if (bpos >= s->buffer_size) {
bpos -= s->buffer_size;
}
if (newb > s->buffer_size - bpos)
newb = s->buffer_size - bpos; // handle wrap...
newb = MPMIN(newb, dst_size - read);
assert(newb >= 0 && read + newb <= dst_size);
assert(bpos >= 0 && bpos + newb <= s->buffer_size);
memcpy(&dst[read], &s->buffer[bpos], newb);
read += newb;
pos += newb;
}
return read;
}
// Whether a seek will be needed to get to the position. This honors seek_limit,
// which is a heuristic to prevent dropping the cache with small forward seeks.
// This helps in situations where waiting for network a bit longer would quickly
// reach the target position. Especially if the demuxer seeks back and forth,
// not dropping the backwards cache will be a major performance win.
static bool needs_seek(struct priv *s, int64_t pos)
{
return pos < s->min_filepos || pos > s->max_filepos + s->seek_limit;
}
static bool cache_update_stream_position(struct priv *s)
{
int64_t read = s->read_filepos;
s->read_seek_failed = false;
if (needs_seek(s, read)) {
MP_VERBOSE(s, "Dropping cache at pos %"PRId64", "
"cached range: %"PRId64"-%"PRId64".\n", read,
s->min_filepos, s->max_filepos);
cache_drop_contents(s);
}
if (stream_tell(s->stream) != s->max_filepos && s->seekable) {
MP_VERBOSE(s, "Seeking underlying stream: %"PRId64" -> %"PRId64"\n",
stream_tell(s->stream), s->max_filepos);
if (!stream_seek(s->stream, s->max_filepos)) {
s->read_seek_failed = true;
return false;
}
}
return stream_tell(s->stream) == s->max_filepos;
}
// Runs in the cache thread.
static void cache_fill(struct priv *s)
{
int64_t read = s->read_filepos;
bool read_attempted = false;
int len = 0;
if (!cache_update_stream_position(s))
goto done;
if (!s->enable_readahead && s->read_min <= s->max_filepos)
goto done;
if (mp_cancel_test(s->cache->cancel))
goto done;
// number of buffer bytes which should be preserved in backwards direction
int64_t back = MPCLAMP(read - s->min_filepos, 0, s->back_size);
// limit maximum readahead so that the backbuffer space is reserved, even
// if the backbuffer is not used. limit it to ensure that we don't stall the
// network when starting a file, or we wouldn't download new data until we
// get new free space again. (unless everything fits in the cache.)
if (s->stream_size > s->buffer_size)
back = MPMAX(back, s->back_size);
// number of buffer bytes that are valid and can be read
int64_t newb = FFMAX(s->max_filepos - read, 0);
// max. number of bytes that can be written (starting from max_filepos)
int64_t space = s->buffer_size - (newb + back);
// offset into the buffer that maps to max_filepos
int64_t pos = s->max_filepos - s->offset;
if (pos >= s->buffer_size)
pos -= s->buffer_size; // wrap-around
if (space < FILL_LIMIT)
goto done;
// limit to end of buffer (without wrapping)
if (pos + space >= s->buffer_size)
space = s->buffer_size - pos;
// limit read size (or else would block and read the entire buffer in 1 call)
space = FFMIN(space, s->stream->read_chunk);
// back+newb+space <= buffer_size
int64_t back2 = s->buffer_size - (space + newb); // max back size
if (s->min_filepos < (read - back2))
s->min_filepos = read - back2;
// The read call might take a long time and block, so drop the lock.
pthread_mutex_unlock(&s->mutex);
len = stream_read_partial(s->stream, &s->buffer[pos], space);
pthread_mutex_lock(&s->mutex);
// Do this after reading a block, because at least libdvdnav updates the
// stream position only after actually reading something after a seek.
if (s->start_pts == MP_NOPTS_VALUE) {
double pts;
if (stream_control(s->stream, STREAM_CTRL_GET_CURRENT_TIME, &pts) > 0)
s->start_pts = pts;
}
s->max_filepos += len;
if (pos + len == s->buffer_size)
s->offset += s->buffer_size; // wrap...
s->speed_amount += len;
read_attempted = true;
done: ;
bool prev_eof = s->eof;
if (read_attempted)
s->eof = len <= 0;
if (!prev_eof && s->eof) {
s->eof_pos = stream_tell(s->stream);
MP_VERBOSE(s, "EOF reached.\n");
}
s->idle = s->eof || !read_attempted;
s->reads++;
update_speed(s);
pthread_cond_signal(&s->wakeup);
}
// This is called both during init and at runtime.
// The size argument is the readahead half only; s->back_size is the backbuffer.
static int resize_cache(struct priv *s, int64_t size)
{
int64_t min_size = FILL_LIMIT * 2;
int64_t max_size = ((size_t)-1) / 8;
if (s->stream_size > 0) {
size = MPMIN(size, s->stream_size);
if (size >= s->stream_size) {
MP_VERBOSE(s, "no backbuffer needed\n");
s->back_size = 0;
}
}
int64_t buffer_size = MPCLAMP(size, min_size, max_size);
s->back_size = MPCLAMP(s->back_size, min_size, max_size);
buffer_size += s->back_size;
unsigned char *buffer = malloc(buffer_size);
if (!buffer)
return STREAM_ERROR;
if (s->buffer) {
// Copy & free the old ringbuffer data.
// If the buffer is too small, prefer to copy these regions:
// 1. Data starting from read_filepos, until cache end
size_t read_1 = read_buffer(s, buffer, buffer_size, s->read_filepos);
// 2. then data from before read_filepos until cache start
// (this one needs to be copied to the end of the ringbuffer)
size_t read_2 = 0;
if (s->min_filepos < s->read_filepos) {
size_t copy_len = buffer_size - read_1;
copy_len = MPMIN(copy_len, s->read_filepos - s->min_filepos);
assert(copy_len + read_1 <= buffer_size);
read_2 = read_buffer(s, buffer + buffer_size - copy_len, copy_len,
s->read_filepos - copy_len);
// This shouldn't happen, unless copy_len was computed incorrectly.
assert(read_2 == copy_len);
}
// Set it up such that read_1 is at buffer pos 0, and read_2 wraps
// around below it, so that it is located at the end of the buffer.
s->min_filepos = s->read_filepos - read_2;
s->max_filepos = s->read_filepos + read_1;
s->offset = s->max_filepos - read_1;
} else {
cache_drop_contents(s);
}
free(s->buffer);
s->buffer_size = buffer_size;
s->buffer = buffer;
s->idle = false;
s->eof = false;
//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 - FILL_LIMIT)
s->seek_limit = s->buffer_size - FILL_LIMIT;
MP_VERBOSE(s, "Cache size set to %lld KiB (%lld KiB backbuffer)\n",
(long long)(s->buffer_size / 1024),
(long long)(s->back_size / 1024));
assert(s->back_size < s->buffer_size);
return STREAM_OK;
}
static void update_cached_controls(struct priv *s)
{
int64_t i64;
double d;
struct mp_tags *tags;
s->stream_time_length = 0;
if (stream_control(s->stream, STREAM_CTRL_GET_TIME_LENGTH, &d) == STREAM_OK)
s->stream_time_length = d;
if (stream_control(s->stream, STREAM_CTRL_GET_METADATA, &tags) == STREAM_OK) {
talloc_free(s->stream_metadata);
s->stream_metadata = talloc_steal(s, tags);
}
s->stream_size = s->eof_pos;
i64 = stream_get_size(s->stream);
if (i64 >= 0)
s->stream_size = i64;
s->has_avseek = stream_control(s->stream, STREAM_CTRL_HAS_AVSEEK, NULL) > 0;
}
// the core might call these every frame, so cache them...
static int cache_get_cached_control(stream_t *cache, int cmd, void *arg)
{
struct priv *s = cache->priv;
switch (cmd) {
case STREAM_CTRL_GET_CACHE_INFO:
*(struct stream_cache_info *)arg = (struct stream_cache_info) {
.size = s->buffer_size - s->back_size,
.fill = s->max_filepos - s->read_filepos,
.idle = s->idle,
.speed = llrint(s->speed),
};
return STREAM_OK;
case STREAM_CTRL_SET_READAHEAD:
s->enable_readahead = *(int *)arg;
pthread_cond_signal(&s->wakeup);
return STREAM_OK;
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_SIZE:
if (s->stream_size < 0)
return STREAM_UNSUPPORTED;
*(int64_t *)arg = s->stream_size;
return STREAM_OK;
case STREAM_CTRL_GET_CURRENT_TIME: {
if (s->start_pts == MP_NOPTS_VALUE)
return STREAM_UNSUPPORTED;
*(double *)arg = s->start_pts;
return STREAM_OK;
}
case STREAM_CTRL_HAS_AVSEEK:
return s->has_avseek ? STREAM_OK : STREAM_UNSUPPORTED;
case STREAM_CTRL_GET_METADATA: {
if (s->stream_metadata) {
ta_set_parent(s->stream_metadata, NULL);
*(struct mp_tags **)arg = s->stream_metadata;
s->stream_metadata = NULL;
return STREAM_OK;
}
return STREAM_UNSUPPORTED;
}
case STREAM_CTRL_AVSEEK:
if (!s->has_avseek)
return STREAM_UNSUPPORTED;
break;
}
return STREAM_ERROR;
}
static bool control_needs_flush(int stream_ctrl)
{
switch (stream_ctrl) {
case STREAM_CTRL_SEEK_TO_TIME:
case STREAM_CTRL_AVSEEK:
case STREAM_CTRL_SET_ANGLE:
case STREAM_CTRL_SET_CURRENT_TITLE:
case STREAM_CTRL_DVB_SET_CHANNEL:
case STREAM_CTRL_DVB_SET_CHANNEL_NAME:
case STREAM_CTRL_DVB_STEP_CHANNEL:
return true;
}
return false;
}
// Runs in the cache thread
static void cache_execute_control(struct priv *s)
{
uint64_t old_pos = stream_tell(s->stream);
s->control_flush = false;
switch (s->control) {
case STREAM_CTRL_SET_CACHE_SIZE:
s->control_res = resize_cache(s, *(int64_t *)s->control_arg);
break;
default:
s->control_res = stream_control(s->stream, s->control, s->control_arg);
}
bool pos_changed = old_pos != stream_tell(s->stream);
bool ok = s->control_res == STREAM_OK;
if (pos_changed && !ok) {
MP_ERR(s, "STREAM_CTRL changed stream pos but "
"returned error, this is not allowed!\n");
} else if (pos_changed || (ok && control_needs_flush(s->control))) {
MP_VERBOSE(s, "Dropping cache due to control()\n");
s->read_filepos = stream_tell(s->stream);
s->read_min = s->read_filepos;
s->control_flush = true;
cache_drop_contents(s);
}
update_cached_controls(s);
s->control = CACHE_CTRL_NONE;
pthread_cond_signal(&s->wakeup);
}
static void *cache_thread(void *arg)
{
struct priv *s = arg;
mpthread_set_name("cache");
pthread_mutex_lock(&s->mutex);
update_cached_controls(s);
double last = mp_time_sec();
while (s->control != CACHE_CTRL_QUIT) {
if (mp_time_sec() - last > CACHE_UPDATE_CONTROLS_TIME) {
update_cached_controls(s);
last = mp_time_sec();
}
if (s->control > 0) {
cache_execute_control(s);
} else if (s->control == CACHE_CTRL_SEEK) {
s->control_res = cache_update_stream_position(s);
s->control = CACHE_CTRL_NONE;
pthread_cond_signal(&s->wakeup);
} else {
cache_fill(s);
}
if (s->control == CACHE_CTRL_PING) {
pthread_cond_signal(&s->wakeup);
s->control = CACHE_CTRL_NONE;
}
if (s->idle && s->control == CACHE_CTRL_NONE) {
struct timespec ts = mp_rel_time_to_timespec(CACHE_IDLE_SLEEP_TIME);
pthread_cond_timedwait(&s->wakeup, &s->mutex, &ts);
}
}
pthread_cond_signal(&s->wakeup);
pthread_mutex_unlock(&s->mutex);
MP_VERBOSE(s, "Cache exiting...\n");
return NULL;
}
static int cache_fill_buffer(struct stream *cache, char *buffer, int max_len)
{
struct priv *s = cache->priv;
assert(s->cache_thread_running);
pthread_mutex_lock(&s->mutex);
if (cache->pos != s->read_filepos)
MP_ERR(s, "!!! read_filepos differs !!! report this bug...\n");
int readb = 0;
if (max_len > 0) {
double retry_time = 0;
int64_t retry = s->reads - 1; // try at least 1 read on EOF
while (1) {
s->read_min = s->read_filepos + max_len + 64 * 1024;
readb = read_buffer(s, buffer, max_len, s->read_filepos);
s->read_filepos += readb;
if (readb > 0)
break;
if (s->eof && s->read_filepos >= s->max_filepos && s->reads >= retry)
break;
s->idle = false;
if (!cache_wakeup_and_wait(s, &retry_time))
break;
if (s->read_seek_failed) {
MP_ERR(s, "error reading after async seek failed\n");
s->read_seek_failed = false;
break;
}
}
}
if (!s->eof) {
// wakeup the cache thread, possibly make it read more data ahead
// this is throttled to reduce excessive wakeups during normal reading
// (using the amount of bytes after which the cache thread most likely
// can actually read new data)
s->bytes_until_wakeup -= readb;
if (s->bytes_until_wakeup <= 0) {
s->bytes_until_wakeup = MPMAX(FILL_LIMIT, s->stream->read_chunk);
pthread_cond_signal(&s->wakeup);
}
}
pthread_mutex_unlock(&s->mutex);
return readb;
}
static int cache_seek(stream_t *cache, int64_t pos)
{
struct priv *s = cache->priv;
assert(s->cache_thread_running);
int r = 1;
pthread_mutex_lock(&s->mutex);
MP_DBG(s, "request seek: %" PRId64 " <= to=%" PRId64
" (cur=%" PRId64 ") <= %" PRId64 " \n",
s->min_filepos, pos, s->read_filepos, s->max_filepos);
if (!s->seekable && pos > s->max_filepos) {
MP_ERR(s, "Attempting to seek past cached data in unseekable stream.\n");
r = 0;
} else if (!s->seekable && pos < s->min_filepos) {
MP_ERR(s, "Attempting to seek before cached data in unseekable stream.\n");
r = 0;
} else {
cache->pos = s->read_filepos = s->read_min = pos;
// Is this seek likely to cause a stream-level seek?
// If it is, wait until that is complete and return its result.
// This check is not quite exact - if the reader thread is blocked in
// a read, the read might advance file position enough that a seek
// forward is no longer needed.
if (needs_seek(s, pos)) {
s->eof = false;
s->control = CACHE_CTRL_SEEK;
s->control_res = 0;
double retry = 0;
while (s->control != CACHE_CTRL_NONE) {
if (!cache_wakeup_and_wait(s, &retry))
break;
}
r = s->control_res;
} else {
pthread_cond_signal(&s->wakeup);
r = 1;
}
}
s->bytes_until_wakeup = 0;
pthread_mutex_unlock(&s->mutex);
return r;
}
static int cache_control(stream_t *cache, int cmd, void *arg)
{
struct priv *s = cache->priv;
int r = STREAM_ERROR;
assert(cmd > 0);
pthread_mutex_lock(&s->mutex);
r = cache_get_cached_control(cache, cmd, arg);
if (r != STREAM_ERROR)
goto done;
MP_VERBOSE(s, "blocking for STREAM_CTRL %d\n", cmd);
s->control = cmd;
s->control_arg = arg;
double retry = 0;
while (s->control != CACHE_CTRL_NONE) {
if (!cache_wakeup_and_wait(s, &retry)) {
s->eof = 1;
r = STREAM_UNSUPPORTED;
goto done;
}
}
r = s->control_res;
if (s->control_flush) {
stream_drop_buffers(cache);
cache->pos = s->read_filepos;
}
done:
pthread_mutex_unlock(&s->mutex);
return r;
}
static void cache_uninit(stream_t *cache)
{
struct priv *s = cache->priv;
if (s->cache_thread_running) {
MP_VERBOSE(s, "Terminating cache...\n");
pthread_mutex_lock(&s->mutex);
s->control = CACHE_CTRL_QUIT;
pthread_cond_signal(&s->wakeup);
pthread_mutex_unlock(&s->mutex);
pthread_join(s->cache_thread, NULL);
}
pthread_mutex_destroy(&s->mutex);
pthread_cond_destroy(&s->wakeup);
free(s->buffer);
talloc_free(s);
}
// return 1 on success, 0 if the cache is disabled/not needed, and -1 on error
// or if the cache is disabled
int stream_cache_init(stream_t *cache, stream_t *stream,
struct mp_cache_opts *opts)
{
if (opts->size < 1)
return 0;
struct priv *s = talloc_zero(NULL, struct priv);
s->log = cache->log;
s->eof_pos = -1;
s->enable_readahead = true;
cache_drop_contents(s);
s->speed_start = mp_time_us();
s->seek_limit = opts->seek_min * 1024ULL;
s->back_size = opts->back_buffer * 1024ULL;
s->stream_size = stream_get_size(stream);
if (resize_cache(s, opts->size * 1024ULL) != STREAM_OK) {
MP_ERR(s, "Failed to allocate cache buffer.\n");
talloc_free(s);
return -1;
}
pthread_mutex_init(&s->mutex, NULL);
pthread_cond_init(&s->wakeup, NULL);
cache->priv = s;
s->cache = cache;
s->stream = stream;
cache->seek = cache_seek;
cache->fill_buffer = cache_fill_buffer;
cache->control = cache_control;
cache->close = cache_uninit;
int64_t min = opts->initial * 1024ULL;
if (min > s->buffer_size - FILL_LIMIT)
min = s->buffer_size - FILL_LIMIT;
s->seekable = stream->seekable;
if (pthread_create(&s->cache_thread, NULL, cache_thread, s) != 0) {
MP_ERR(s, "Starting cache thread failed.\n");
return -1;
}
s->cache_thread_running = true;
// wait until cache is filled with at least min bytes
if (min < 1)
return 1;
for (;;) {
if (mp_cancel_test(cache->cancel))
return -1;
struct stream_cache_info info;
if (stream_control(s->cache, STREAM_CTRL_GET_CACHE_INFO, &info) < 0)
break;
mp_msg(s->log, MSGL_STATUS, "Cache fill: %5.2f%% "
"(%" PRId64 " bytes)", 100.0 * info.fill / s->buffer_size,
info.fill);
if (info.fill >= min)
break;
if (info.idle)
break; // file is smaller than prefill size
// Wake up if the cache is done reading some data (or on timeout/abort)
pthread_mutex_lock(&s->mutex);
s->control = CACHE_CTRL_PING;
pthread_cond_signal(&s->wakeup);
cache_wakeup_and_wait(s, &(double){0});
pthread_mutex_unlock(&s->mutex);
}
return 1;
}
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