mirror of
https://git.videolan.org/git/ffmpeg.git
synced 2024-08-21 08:45:06 +02:00
359 lines
8.3 KiB
C
359 lines
8.3 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 GNU
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* 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 FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include <string.h>
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#include "atomic.h"
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#include "buffer_internal.h"
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#include "common.h"
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#include "mem.h"
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AVBufferRef *av_buffer_create(uint8_t *data, int size,
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void (*free)(void *opaque, uint8_t *data),
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void *opaque, int flags)
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{
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AVBufferRef *ref = NULL;
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AVBuffer *buf = NULL;
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buf = av_mallocz(sizeof(*buf));
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if (!buf)
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return NULL;
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buf->data = data;
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buf->size = size;
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buf->free = free ? free : av_buffer_default_free;
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buf->opaque = opaque;
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buf->refcount = 1;
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if (flags & AV_BUFFER_FLAG_READONLY)
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buf->flags |= BUFFER_FLAG_READONLY;
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ref = av_mallocz(sizeof(*ref));
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if (!ref) {
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av_freep(&buf);
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return NULL;
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}
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ref->buffer = buf;
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ref->data = data;
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ref->size = size;
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return ref;
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}
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void av_buffer_default_free(void *opaque, uint8_t *data)
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{
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av_free(data);
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}
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AVBufferRef *av_buffer_alloc(int size)
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{
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AVBufferRef *ret = NULL;
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uint8_t *data = NULL;
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data = av_malloc(size);
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if (!data)
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return NULL;
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ret = av_buffer_create(data, size, av_buffer_default_free, NULL, 0);
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if (!ret)
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av_freep(&data);
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return ret;
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}
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AVBufferRef *av_buffer_allocz(int size)
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{
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AVBufferRef *ret = av_buffer_alloc(size);
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if (!ret)
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return NULL;
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memset(ret->data, 0, size);
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return ret;
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}
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AVBufferRef *av_buffer_ref(AVBufferRef *buf)
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{
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AVBufferRef *ret = av_mallocz(sizeof(*ret));
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if (!ret)
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return NULL;
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*ret = *buf;
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avpriv_atomic_int_add_and_fetch(&buf->buffer->refcount, 1);
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return ret;
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}
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void av_buffer_unref(AVBufferRef **buf)
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{
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AVBuffer *b;
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if (!buf || !*buf)
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return;
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b = (*buf)->buffer;
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av_freep(buf);
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if (!avpriv_atomic_int_add_and_fetch(&b->refcount, -1)) {
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b->free(b->opaque, b->data);
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av_freep(&b);
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}
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}
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int av_buffer_is_writable(const AVBufferRef *buf)
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{
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if (buf->buffer->flags & AV_BUFFER_FLAG_READONLY)
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return 0;
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return avpriv_atomic_int_get(&buf->buffer->refcount) == 1;
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}
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void *av_buffer_get_opaque(const AVBufferRef *buf)
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{
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return buf->buffer->opaque;
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}
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int av_buffer_get_ref_count(const AVBufferRef *buf)
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{
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return buf->buffer->refcount;
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}
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int av_buffer_make_writable(AVBufferRef **pbuf)
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{
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AVBufferRef *newbuf, *buf = *pbuf;
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if (av_buffer_is_writable(buf))
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return 0;
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newbuf = av_buffer_alloc(buf->size);
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if (!newbuf)
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return AVERROR(ENOMEM);
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memcpy(newbuf->data, buf->data, buf->size);
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av_buffer_unref(pbuf);
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*pbuf = newbuf;
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return 0;
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}
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int av_buffer_realloc(AVBufferRef **pbuf, int size)
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{
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AVBufferRef *buf = *pbuf;
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uint8_t *tmp;
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if (!buf) {
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/* allocate a new buffer with av_realloc(), so it will be reallocatable
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* later */
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uint8_t *data = av_realloc(NULL, size);
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if (!data)
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return AVERROR(ENOMEM);
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buf = av_buffer_create(data, size, av_buffer_default_free, NULL, 0);
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if (!buf) {
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av_freep(&data);
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return AVERROR(ENOMEM);
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}
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buf->buffer->flags |= BUFFER_FLAG_REALLOCATABLE;
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*pbuf = buf;
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return 0;
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} else if (buf->size == size)
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return 0;
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if (!(buf->buffer->flags & BUFFER_FLAG_REALLOCATABLE) ||
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!av_buffer_is_writable(buf)) {
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/* cannot realloc, allocate a new reallocable buffer and copy data */
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AVBufferRef *new = NULL;
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av_buffer_realloc(&new, size);
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if (!new)
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return AVERROR(ENOMEM);
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memcpy(new->data, buf->data, FFMIN(size, buf->size));
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av_buffer_unref(pbuf);
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*pbuf = new;
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return 0;
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}
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tmp = av_realloc(buf->buffer->data, size);
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if (!tmp)
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return AVERROR(ENOMEM);
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buf->buffer->data = buf->data = tmp;
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buf->buffer->size = buf->size = size;
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return 0;
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}
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AVBufferPool *av_buffer_pool_init(int size, AVBufferRef* (*alloc)(int size))
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{
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AVBufferPool *pool = av_mallocz(sizeof(*pool));
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if (!pool)
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return NULL;
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pool->size = size;
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pool->alloc = alloc ? alloc : av_buffer_alloc;
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avpriv_atomic_int_set(&pool->refcount, 1);
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return pool;
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}
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/*
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* This function gets called when the pool has been uninited and
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* all the buffers returned to it.
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*/
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static void buffer_pool_free(AVBufferPool *pool)
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{
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while (pool->pool) {
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BufferPoolEntry *buf = pool->pool;
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pool->pool = buf->next;
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buf->free(buf->opaque, buf->data);
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av_freep(&buf);
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}
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av_freep(&pool);
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}
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void av_buffer_pool_uninit(AVBufferPool **ppool)
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{
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AVBufferPool *pool;
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if (!ppool || !*ppool)
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return;
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pool = *ppool;
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*ppool = NULL;
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if (!avpriv_atomic_int_add_and_fetch(&pool->refcount, -1))
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buffer_pool_free(pool);
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}
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/* remove the whole buffer list from the pool and return it */
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static BufferPoolEntry *get_pool(AVBufferPool *pool)
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{
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BufferPoolEntry *cur = *(void * volatile *)&pool->pool, *last = NULL;
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while (cur != last) {
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last = cur;
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cur = avpriv_atomic_ptr_cas((void * volatile *)&pool->pool, last, NULL);
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if (!cur)
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return NULL;
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}
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return cur;
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}
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static void add_to_pool(BufferPoolEntry *buf)
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{
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AVBufferPool *pool;
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BufferPoolEntry *cur, *end = buf;
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if (!buf)
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return;
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pool = buf->pool;
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while (end->next)
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end = end->next;
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while (avpriv_atomic_ptr_cas((void * volatile *)&pool->pool, NULL, buf)) {
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/* pool is not empty, retrieve it and append it to our list */
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cur = get_pool(pool);
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end->next = cur;
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while (end->next)
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end = end->next;
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}
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}
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static void pool_release_buffer(void *opaque, uint8_t *data)
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{
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BufferPoolEntry *buf = opaque;
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AVBufferPool *pool = buf->pool;
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if(CONFIG_MEMORY_POISONING)
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memset(buf->data, FF_MEMORY_POISON, pool->size);
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add_to_pool(buf);
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if (!avpriv_atomic_int_add_and_fetch(&pool->refcount, -1))
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buffer_pool_free(pool);
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}
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/* allocate a new buffer and override its free() callback so that
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* it is returned to the pool on free */
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static AVBufferRef *pool_alloc_buffer(AVBufferPool *pool)
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{
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BufferPoolEntry *buf;
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AVBufferRef *ret;
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ret = pool->alloc(pool->size);
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if (!ret)
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return NULL;
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buf = av_mallocz(sizeof(*buf));
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if (!buf) {
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av_buffer_unref(&ret);
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return NULL;
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}
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buf->data = ret->buffer->data;
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buf->opaque = ret->buffer->opaque;
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buf->free = ret->buffer->free;
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buf->pool = pool;
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ret->buffer->opaque = buf;
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ret->buffer->free = pool_release_buffer;
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avpriv_atomic_int_add_and_fetch(&pool->refcount, 1);
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avpriv_atomic_int_add_and_fetch(&pool->nb_allocated, 1);
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return ret;
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}
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AVBufferRef *av_buffer_pool_get(AVBufferPool *pool)
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{
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AVBufferRef *ret;
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BufferPoolEntry *buf;
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/* check whether the pool is empty */
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buf = get_pool(pool);
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if (!buf && pool->refcount <= pool->nb_allocated) {
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av_log(NULL, AV_LOG_DEBUG, "Pool race dectected, spining to avoid overallocation and eventual OOM\n");
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while (!buf && avpriv_atomic_int_get(&pool->refcount) <= avpriv_atomic_int_get(&pool->nb_allocated))
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buf = get_pool(pool);
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}
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if (!buf)
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return pool_alloc_buffer(pool);
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/* keep the first entry, return the rest of the list to the pool */
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add_to_pool(buf->next);
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buf->next = NULL;
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ret = av_buffer_create(buf->data, pool->size, pool_release_buffer,
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buf, 0);
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if (!ret) {
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add_to_pool(buf);
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return NULL;
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}
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avpriv_atomic_int_add_and_fetch(&pool->refcount, 1);
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return ret;
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}
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