mirror of
https://github.com/mpv-player/mpv
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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
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with mpv; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <assert.h>
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#include "talloc.h"
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#include "core/mp_common.h"
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#include "video/mp_image.h"
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#include "mp_image_pool.h"
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struct pool_trampoline {
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struct mp_image_pool *pool;
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int refcount;
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};
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static int image_pool_destructor(void *ptr)
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{
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struct mp_image_pool *pool = ptr;
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mp_image_pool_clear(pool);
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pool->trampoline->pool = NULL;
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if (!pool->trampoline->refcount)
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talloc_free(pool->trampoline);
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return 0;
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}
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struct mp_image_pool *mp_image_pool_new(int max_count)
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{
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struct mp_image_pool *pool = talloc_ptrtype(NULL, pool);
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talloc_set_destructor(pool, image_pool_destructor);
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*pool = (struct mp_image_pool) {
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.max_count = max_count,
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.trampoline = talloc_struct(NULL, struct pool_trampoline, {
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.pool = pool,
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}),
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};
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return pool;
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}
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void mp_image_pool_clear(struct mp_image_pool *pool)
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{
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for (int n = 0; n < pool->num_images; n++) {
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struct mp_image *img = pool->images[n];
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if (img->priv) {
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// Image data is being used - detach from the pool, and make it
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// free itself when pool_free_image() is called
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img->priv = talloc_struct(NULL, struct pool_trampoline, {
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.refcount = 1,
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});
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} else {
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talloc_free(img);
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}
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}
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pool->num_images = 0;
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pool->trampoline->refcount = 0;
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}
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static void pool_free_image(void *ptr)
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{
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struct mp_image *img = ptr;
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struct pool_trampoline *trampoline = img->priv;
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trampoline->refcount--;
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img->priv = NULL;
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if (!trampoline->pool) {
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// pool was free'd while image reference was still held
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if (trampoline->refcount == 0)
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talloc_free(trampoline);
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talloc_free(img);
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}
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}
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// Return a new image of given format/size. The only difference to
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// mp_image_alloc() is that there is a transparent mechanism to recycle image
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// data allocations through this pool.
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// The image can be free'd with talloc_free().
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struct mp_image *mp_image_pool_get(struct mp_image_pool *pool, unsigned int fmt,
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int w, int h)
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{
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struct mp_image *new = NULL;
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for (int n = 0; n < pool->num_images; n++) {
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struct mp_image *img = pool->images[n];
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if (!img->priv && img->imgfmt == fmt && img->w == w && img->h == h) {
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new = img;
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break;
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}
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}
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if (!new) {
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if (pool->num_images >= pool->max_count)
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mp_image_pool_clear(pool);
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new = mp_image_alloc(fmt, w, h);
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MP_TARRAY_APPEND(pool, pool->images, pool->num_images, new);
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}
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pool->trampoline->refcount++;
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new->priv = pool->trampoline;
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return mp_image_new_custom_ref(new, new, pool_free_image);
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}
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// Like mp_image_new_copy(), but allocate the image out of the pool.
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struct mp_image *mp_image_pool_new_copy(struct mp_image_pool *pool,
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struct mp_image *img)
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{
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struct mp_image *new = mp_image_pool_get(pool, img->imgfmt, img->w, img->h);
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mp_image_copy(new, img);
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mp_image_copy_attributes(new, img);
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return new;
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}
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// Like mp_image_make_writeable(), but if a copy has to be made, allocate it
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// out of the pool.
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void mp_image_pool_make_writeable(struct mp_image_pool *pool,
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struct mp_image *img)
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{
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if (mp_image_is_writeable(img))
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return;
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mp_image_steal_data(img, mp_image_pool_new_copy(pool, img));
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assert(mp_image_is_writeable(img));
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}
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