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/*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <stdint.h>
#include <string.h>
#include "atomic.h"
#include "buffer_internal.h"
#include "common.h"
#include "mem.h"
AVBufferRef *av_buffer_create(uint8_t *data, int size,
void (*free)(void *opaque, uint8_t *data),
void *opaque, int flags)
{
AVBufferRef *ref = NULL;
AVBuffer *buf = NULL;
buf = av_mallocz(sizeof(*buf));
if (!buf)
return NULL;
buf->data = data;
buf->size = size;
buf->free = free ? free : av_buffer_default_free;
buf->opaque = opaque;
buf->refcount = 1;
if (flags & AV_BUFFER_FLAG_READONLY)
buf->flags |= BUFFER_FLAG_READONLY;
ref = av_mallocz(sizeof(*ref));
if (!ref) {
av_freep(&buf);
return NULL;
}
ref->buffer = buf;
ref->data = data;
ref->size = size;
return ref;
}
void av_buffer_default_free(void *opaque, uint8_t *data)
{
av_free(data);
}
AVBufferRef *av_buffer_alloc(int size)
{
AVBufferRef *ret = NULL;
uint8_t *data = NULL;
data = av_malloc(size);
if (!data)
return NULL;
ret = av_buffer_create(data, size, av_buffer_default_free, NULL, 0);
if (!ret)
av_freep(&data);
return ret;
}
AVBufferRef *av_buffer_allocz(int size)
{
AVBufferRef *ret = av_buffer_alloc(size);
if (!ret)
return NULL;
memset(ret->data, 0, size);
return ret;
}
AVBufferRef *av_buffer_ref(AVBufferRef *buf)
{
AVBufferRef *ret = av_mallocz(sizeof(*ret));
if (!ret)
return NULL;
*ret = *buf;
avpriv_atomic_int_add_and_fetch(&buf->buffer->refcount, 1);
return ret;
}
void av_buffer_unref(AVBufferRef **buf)
{
AVBuffer *b;
if (!buf || !*buf)
return;
b = (*buf)->buffer;
av_freep(buf);
if (!avpriv_atomic_int_add_and_fetch(&b->refcount, -1)) {
b->free(b->opaque, b->data);
av_freep(&b);
}
}
int av_buffer_is_writable(const AVBufferRef *buf)
{
if (buf->buffer->flags & AV_BUFFER_FLAG_READONLY)
return 0;
return avpriv_atomic_int_add_and_fetch(&buf->buffer->refcount, 0) == 1;
}
int av_buffer_make_writable(AVBufferRef **pbuf)
{
AVBufferRef *newbuf, *buf = *pbuf;
if (av_buffer_is_writable(buf))
return 0;
newbuf = av_buffer_alloc(buf->size);
if (!newbuf)
return AVERROR(ENOMEM);
memcpy(newbuf->data, buf->data, buf->size);
av_buffer_unref(pbuf);
*pbuf = newbuf;
return 0;
}
int av_buffer_realloc(AVBufferRef **pbuf, int size)
{
AVBufferRef *buf = *pbuf;
uint8_t *tmp;
if (!buf) {
/* allocate a new buffer with av_realloc(), so it will be reallocatable
* later */
uint8_t *data = av_realloc(NULL, size);
if (!data)
return AVERROR(ENOMEM);
buf = av_buffer_create(data, size, av_buffer_default_free, NULL, 0);
if (!buf) {
av_freep(&data);
return AVERROR(ENOMEM);
}
buf->buffer->flags |= BUFFER_FLAG_REALLOCATABLE;
*pbuf = buf;
return 0;
} else if (buf->size == size)
return 0;
if (!(buf->buffer->flags & BUFFER_FLAG_REALLOCATABLE) ||
!av_buffer_is_writable(buf)) {
/* cannot realloc, allocate a new reallocable buffer and copy data */
AVBufferRef *new = NULL;
av_buffer_realloc(&new, size);
if (!new)
return AVERROR(ENOMEM);
memcpy(new->data, buf->data, FFMIN(size, buf->size));
av_buffer_unref(pbuf);
*pbuf = new;
return 0;
}
tmp = av_realloc(buf->buffer->data, size);
if (!tmp)
return AVERROR(ENOMEM);
buf->buffer->data = buf->data = tmp;
buf->buffer->size = buf->size = size;
return 0;
}
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