mirror of
https://github.com/mpv-player/mpv
synced 2024-12-11 17:37:23 +00:00
8a9b64329c
This covers source files which were added in mplayer2 and mpv times
only, and where all code is covered by LGPL relicensing agreements.
There are probably more files to which this applies, but I'm being
conservative here.
A file named ao_sdl.c exists in MPlayer too, but the mpv one is a
complete rewrite, and was added some time after the original ao_sdl.c
was removed. The same applies to vo_sdl.c, for which the SDL2 API is
radically different in addition (MPlayer supports SDL 1.2 only).
common.c contains only code written by me. But common.h is a strange
case: although it originally was named mp_common.h and exists in MPlayer
too, by now it contains only definitions written by uau and me. The
exceptions are the CONTROL_ defines - thus not changing the license of
common.h yet.
codec_tags.c contained once large tables generated from MPlayer's
codecs.conf, but all of these tables were removed.
From demux_playlist.c I'm removing a code fragment from someone who was
not asked; this probably could be done later (see commit 15dccc37
).
misc.c is a bit complicated to reason about (it was split off mplayer.c
and thus contains random functions out of this file), but actually all
functions have been added post-MPlayer. Except get_relative_time(),
which was written by uau, but looks similar to 3 different versions of
something similar in each of the Unix/win32/OSX timer source files. I'm
not sure what that means in regards to copyright, so I've just moved it
into another still-GPL source file for now.
screenshot.c once had some minor parts of MPlayer's vf_screenshot.c, but
they're all gone.
245 lines
8.0 KiB
C
245 lines
8.0 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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// 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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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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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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