mirror of
https://github.com/mpv-player/mpv
synced 2024-12-24 07:42:17 +00:00
1568161aad
Refcounting will conceptually allocate and free images all the time when using the filter chain. Add a pool that makes these reallocations cheap. This only affects the image data, not mp_image structs and similar small allocations. Small allocations are always fast with reasonable memory managers, while large image data will trigger mmap/munmap calls each time.
134 lines
4.1 KiB
C
134 lines
4.1 KiB
C
/*
|
|
* This file is part of mpv.
|
|
*
|
|
* mpv 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.
|
|
*
|
|
* 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with mpv; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*/
|
|
|
|
#include <assert.h>
|
|
|
|
#include "talloc.h"
|
|
|
|
#include "core/mp_common.h"
|
|
#include "video/mp_image.h"
|
|
|
|
#include "mp_image_pool.h"
|
|
|
|
struct pool_trampoline {
|
|
struct mp_image_pool *pool;
|
|
int refcount;
|
|
};
|
|
|
|
static int image_pool_destructor(void *ptr)
|
|
{
|
|
struct mp_image_pool *pool = ptr;
|
|
mp_image_pool_clear(pool);
|
|
pool->trampoline->pool = NULL;
|
|
if (!pool->trampoline->refcount)
|
|
talloc_free(pool->trampoline);
|
|
return 0;
|
|
}
|
|
|
|
struct mp_image_pool *mp_image_pool_new(int max_count)
|
|
{
|
|
struct mp_image_pool *pool = talloc_ptrtype(NULL, pool);
|
|
talloc_set_destructor(pool, image_pool_destructor);
|
|
*pool = (struct mp_image_pool) {
|
|
.max_count = max_count,
|
|
.trampoline = talloc_struct(NULL, struct pool_trampoline, {
|
|
.pool = pool,
|
|
}),
|
|
};
|
|
return pool;
|
|
}
|
|
|
|
void mp_image_pool_clear(struct mp_image_pool *pool)
|
|
{
|
|
for (int n = 0; n < pool->num_images; n++) {
|
|
struct mp_image *img = pool->images[n];
|
|
if (img->priv) {
|
|
// Image data is being used - detach from the pool, and make it
|
|
// free itself when pool_free_image() is called
|
|
img->priv = talloc_struct(NULL, struct pool_trampoline, {
|
|
.refcount = 1,
|
|
});
|
|
} else {
|
|
talloc_free(img);
|
|
}
|
|
}
|
|
pool->num_images = 0;
|
|
pool->trampoline->refcount = 0;
|
|
}
|
|
|
|
static void pool_free_image(void *ptr)
|
|
{
|
|
struct mp_image *img = ptr;
|
|
struct pool_trampoline *trampoline = img->priv;
|
|
trampoline->refcount--;
|
|
img->priv = NULL;
|
|
if (!trampoline->pool) {
|
|
// pool was free'd while image reference was still held
|
|
if (trampoline->refcount == 0)
|
|
talloc_free(trampoline);
|
|
talloc_free(img);
|
|
}
|
|
}
|
|
|
|
// Return a new image of given format/size. The only difference to
|
|
// mp_image_alloc() is that there is a transparent mechanism to recycle image
|
|
// data allocations through this pool.
|
|
// The image can be free'd with talloc_free().
|
|
struct mp_image *mp_image_pool_get(struct mp_image_pool *pool, unsigned int fmt,
|
|
int w, int h)
|
|
{
|
|
struct mp_image *new = NULL;
|
|
for (int n = 0; n < pool->num_images; n++) {
|
|
struct mp_image *img = pool->images[n];
|
|
if (!img->priv && img->imgfmt == fmt && img->w == w && img->h == h) {
|
|
new = img;
|
|
break;
|
|
}
|
|
}
|
|
if (!new) {
|
|
if (pool->num_images >= pool->max_count)
|
|
mp_image_pool_clear(pool);
|
|
new = mp_image_alloc(fmt, w, h);
|
|
MP_TARRAY_APPEND(pool, pool->images, pool->num_images, new);
|
|
}
|
|
pool->trampoline->refcount++;
|
|
new->priv = pool->trampoline;
|
|
return mp_image_new_custom_ref(new, new, pool_free_image);
|
|
}
|
|
|
|
// Like mp_image_new_copy(), but allocate the image out of the pool.
|
|
struct mp_image *mp_image_pool_new_copy(struct mp_image_pool *pool,
|
|
struct mp_image *img)
|
|
{
|
|
struct mp_image *new = mp_image_pool_get(pool, img->imgfmt, img->w, img->h);
|
|
mp_image_copy(new, img);
|
|
mp_image_copy_attributes(new, img);
|
|
return new;
|
|
}
|
|
|
|
// Like mp_image_make_writeable(), but if a copy has to be made, allocate it
|
|
// out of the pool.
|
|
void mp_image_pool_make_writeable(struct mp_image_pool *pool,
|
|
struct mp_image *img)
|
|
{
|
|
if (mp_image_is_writeable(img))
|
|
return;
|
|
mp_image_steal_data(img, mp_image_pool_new_copy(pool, img));
|
|
assert(mp_image_is_writeable(img));
|
|
}
|