/*
* utils for libavcodec
* Copyright (c) 2001 Fabrice Bellard.
* Copyright (c) 2003 Michel Bardiaux for the av_log API
* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
*
* This library 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 of the License, or (at your option) any later version.
*
* This library 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 this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/**
* @file utils.c
* utils.
*/
#include "avcodec.h"
#include "dsputil.h"
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <limits.h>
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void *
av_mallocz (unsigned int size)
{
void *ptr;
ptr = av_malloc (size);
if (!ptr)
return NULL;
memset (ptr, 0, size);
return ptr;
}
#ifdef __SYMBIAN32__
EXPORT_C
#endif
char *
av_strdup (const char *s)
{
char *ptr;
int len;
len = strlen (s) + 1;
ptr = av_malloc (len);
if (!ptr)
return NULL;
memcpy (ptr, s, len);
return ptr;
}
/**
* realloc which does nothing if the block is large enough
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void *
av_fast_realloc (void *ptr, unsigned int *size, unsigned int min_size)
{
if (min_size < *size)
return ptr;
*size = 17 * min_size / 16 + 32;
return av_realloc (ptr, *size);
}
static unsigned int last_static = 0;
static unsigned int allocated_static = 0;
static void **array_static = NULL;
/**
* allocation of static arrays - do not use for normal allocation.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void *
av_mallocz_static (unsigned int size)
{
void *ptr = av_mallocz (size);
if (ptr) {
array_static =
av_fast_realloc (array_static, &allocated_static,
sizeof (void *) * (last_static + 1));
array_static[last_static++] = ptr;
}
return ptr;
}
/**
* free all static arrays and reset pointers to 0.
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
av_free_static (void)
{
while (last_static) {
av_freep (&array_static[--last_static]);
}
av_freep (&array_static);
}
/**
* Frees memory and sets the pointer to NULL.
* @param arg pointer to the pointer which should be freed
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
av_freep (void *arg)
{
void **ptr = (void **) arg;
av_free (*ptr);
*ptr = NULL;
}
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
avcodec_get_context_defaults (AVCodecContext * s)
{
memset (s, 0, sizeof (AVCodecContext));
s->frame_rate_base = 1;
s->frame_rate = 25;
}
/**
* allocates a AVCodecContext and set it to defaults.
* this can be deallocated by simply calling free()
*/
#ifdef __SYMBIAN32__
EXPORT_C
#endif
AVCodecContext *
avcodec_alloc_context (void)
{
AVCodecContext *avctx = av_malloc (sizeof (AVCodecContext));
if (avctx == NULL)
return NULL;
avcodec_get_context_defaults (avctx);
return avctx;
}
/* must be called before any other functions */
#ifdef __SYMBIAN32__
EXPORT_C
#endif
void
avcodec_init (void)
{
static int inited = 0;
if (inited != 0)
return;
inited = 1;
dsputil_static_init ();
}