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https://github.com/mpv-player/mpv
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![Kevin Mitchell](/assets/img/avatar_default.png)
Provide a way for the user to add mp_images to the pool. This is required for dxva2, for which using set_allocator is extremely awkward since all the d3d9 surfaces must be allocated in advance and all together.
250 lines
8.1 KiB
C
250 lines
8.1 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
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <stddef.h>
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#include <stdbool.h>
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#include <pthread.h>
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#include <assert.h>
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#include <libavutil/buffer.h>
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#include "mpv_talloc.h"
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#include "common/common.h"
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#include "video/mp_image.h"
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#include "mp_image_pool.h"
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static pthread_mutex_t pool_mutex = PTHREAD_MUTEX_INITIALIZER;
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#define pool_lock() pthread_mutex_lock(&pool_mutex)
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#define pool_unlock() pthread_mutex_unlock(&pool_mutex)
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// Thread-safety: the pool itself is not thread-safe, but pool-allocated images
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// can be referenced and unreferenced from other threads. (As long as the image
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// destructors are thread-safe.)
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struct mp_image_pool {
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int max_count;
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struct mp_image **images;
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int num_images;
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mp_image_allocator allocator;
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void *allocator_ctx;
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bool use_lru;
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unsigned int lru_counter;
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};
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// Used to gracefully handle the case when the pool is freed while image
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// references allocated from the image pool are still held by someone.
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struct image_flags {
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// If both of these are false, the image must be freed.
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bool referenced; // outside mp_image reference exists
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bool pool_alive; // the mp_image_pool references this
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unsigned int order; // for LRU allocation (basically a timestamp)
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};
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static void 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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}
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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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};
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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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struct image_flags *it = img->priv;
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bool referenced;
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pool_lock();
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assert(it->pool_alive);
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it->pool_alive = false;
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referenced = it->referenced;
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pool_unlock();
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if (!referenced)
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talloc_free(img);
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}
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pool->num_images = 0;
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}
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// This is the only function that is allowed to run in a different thread.
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// (Consider passing an image to another thread, which frees it.)
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static void unref_image(void *opaque, uint8_t *data)
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{
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struct mp_image *img = opaque;
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struct image_flags *it = img->priv;
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bool alive;
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pool_lock();
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assert(it->referenced);
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it->referenced = false;
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alive = it->pool_alive;
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pool_unlock();
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if (!alive)
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talloc_free(img);
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}
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// Return a new image of given format/size. Unlike mp_image_pool_get(), this
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// returns NULL if there is no free image of this format/size.
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struct mp_image *mp_image_pool_get_no_alloc(struct mp_image_pool *pool, 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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pool_lock();
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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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struct image_flags *img_it = img->priv;
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assert(img_it->pool_alive);
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if (!img_it->referenced) {
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if (img->imgfmt == fmt && img->w == w && img->h == h) {
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if (pool->use_lru) {
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struct image_flags *new_it = new ? new->priv : NULL;
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if (!new_it || new_it->order > img_it->order)
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new = img;
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} else {
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new = img;
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break;
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}
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}
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}
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}
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pool_unlock();
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if (!new)
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return NULL;
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// Reference the new image. Since mp_image_pool is not declared thread-safe,
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// and unreffing images from other threads does not allocate new images,
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// no synchronization is required here.
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for (int p = 0; p < MP_MAX_PLANES; p++)
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assert(!!new->bufs[p] == !p); // only 1 AVBufferRef
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struct mp_image *ref = mp_image_new_dummy_ref(new);
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// This assumes the buffer is at this point exclusively owned by us: we
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// can't track whether the buffer is unique otherwise.
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// (av_buffer_is_writable() checks the refcount of the new buffer only.)
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int flags = av_buffer_is_writable(new->bufs[0]) ? 0 : AV_BUFFER_FLAG_READONLY;
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ref->bufs[0] = av_buffer_create(new->bufs[0]->data, new->bufs[0]->size,
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unref_image, new, flags);
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if (!ref->bufs[0]) {
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talloc_free(ref);
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return NULL;
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}
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struct image_flags *it = new->priv;
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assert(!it->referenced && it->pool_alive);
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it->referenced = true;
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it->order = ++pool->lru_counter;
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return ref;
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}
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void mp_image_pool_add(struct mp_image_pool *pool, struct mp_image *new)
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{
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struct image_flags *it = talloc_ptrtype(new, it);
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*it = (struct image_flags) { .pool_alive = true };
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new->priv = it;
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MP_TARRAY_APPEND(pool, pool->images, pool->num_images, new);
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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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// If pool==NULL, mp_image_alloc() is called (for convenience).
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// The image can be free'd with talloc_free().
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// Returns NULL on OOM.
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struct mp_image *mp_image_pool_get(struct mp_image_pool *pool, int fmt,
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int w, int h)
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{
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if (!pool)
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return mp_image_alloc(fmt, w, h);
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struct mp_image *new = mp_image_pool_get_no_alloc(pool, fmt, w, h);
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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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if (pool->allocator) {
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new = pool->allocator(pool->allocator_ctx, fmt, w, h);
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} else {
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new = mp_image_alloc(fmt, w, h);
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}
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if (!new)
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return NULL;
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mp_image_pool_add(pool, new);
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new = mp_image_pool_get_no_alloc(pool, fmt, w, h);
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}
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return new;
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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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// If pool==NULL, a plain copy is made (for convenience).
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// Returns NULL on OOM.
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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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if (new) {
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mp_image_copy(new, img);
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mp_image_copy_attributes(new, img);
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}
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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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// If pool==NULL, mp_image_make_writeable() is called (for convenience).
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// Returns false on failure (see mp_image_make_writeable()).
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bool 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 true;
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struct mp_image *new = mp_image_pool_new_copy(pool, img);
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if (!new)
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return false;
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mp_image_steal_data(img, new);
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assert(mp_image_is_writeable(img));
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return true;
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}
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// Call cb(cb_data, fmt, w, h) to allocate an image. Note that the resulting
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// image must use only 1 AVBufferRef. The returned image must also be owned
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// exclusively by the image pool, otherwise mp_image_is_writeable() will not
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// work due to FFmpeg restrictions.
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void mp_image_pool_set_allocator(struct mp_image_pool *pool,
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mp_image_allocator cb, void *cb_data)
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{
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pool->allocator = cb;
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pool->allocator_ctx = cb_data;
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}
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// Put into LRU mode. (Likely better for hwaccel surfaces, but worse for memory.)
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void mp_image_pool_set_lru(struct mp_image_pool *pool)
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{
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pool->use_lru = true;
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}
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