mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-12 01:18:24 -05:00
241 lines
5.9 KiB
C
241 lines
5.9 KiB
C
|
/*
|
||
|
* a very simple circular buffer FIFO implementation
|
||
|
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
|
||
|
* Copyright (c) 2006 Roman Shaposhnik
|
||
|
*
|
||
|
* This file is part of FFmpeg.
|
||
|
*
|
||
|
* FFmpeg 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.
|
||
|
*
|
||
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
||
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
*/
|
||
|
|
||
|
#include "avassert.h"
|
||
|
#include "common.h"
|
||
|
#include "fifo.h"
|
||
|
|
||
|
static AVFifoBuffer *fifo_alloc_common(void *buffer, size_t size)
|
||
|
{
|
||
|
AVFifoBuffer *f;
|
||
|
if (!buffer)
|
||
|
return NULL;
|
||
|
f = av_mallocz(sizeof(AVFifoBuffer));
|
||
|
if (!f) {
|
||
|
av_free(buffer);
|
||
|
return NULL;
|
||
|
}
|
||
|
f->buffer = buffer;
|
||
|
f->end = f->buffer + size;
|
||
|
av_fifo_reset(f);
|
||
|
return f;
|
||
|
}
|
||
|
|
||
|
AVFifoBuffer *av_fifo_alloc(unsigned int size)
|
||
|
{
|
||
|
void *buffer = av_malloc(size);
|
||
|
return fifo_alloc_common(buffer, size);
|
||
|
}
|
||
|
|
||
|
AVFifoBuffer *av_fifo_alloc_array(size_t nmemb, size_t size)
|
||
|
{
|
||
|
void *buffer = av_malloc_array(nmemb, size);
|
||
|
return fifo_alloc_common(buffer, nmemb * size);
|
||
|
}
|
||
|
|
||
|
void av_fifo_free(AVFifoBuffer *f)
|
||
|
{
|
||
|
if (f) {
|
||
|
av_freep(&f->buffer);
|
||
|
av_free(f);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void av_fifo_freep(AVFifoBuffer **f)
|
||
|
{
|
||
|
if (f) {
|
||
|
av_fifo_free(*f);
|
||
|
*f = NULL;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
void av_fifo_reset(AVFifoBuffer *f)
|
||
|
{
|
||
|
f->wptr = f->rptr = f->buffer;
|
||
|
f->wndx = f->rndx = 0;
|
||
|
}
|
||
|
|
||
|
int av_fifo_size(const AVFifoBuffer *f)
|
||
|
{
|
||
|
return (uint32_t)(f->wndx - f->rndx);
|
||
|
}
|
||
|
|
||
|
int av_fifo_space(const AVFifoBuffer *f)
|
||
|
{
|
||
|
return f->end - f->buffer - av_fifo_size(f);
|
||
|
}
|
||
|
|
||
|
int av_fifo_realloc2(AVFifoBuffer *f, unsigned int new_size)
|
||
|
{
|
||
|
unsigned int old_size = f->end - f->buffer;
|
||
|
|
||
|
if (old_size < new_size) {
|
||
|
int len = av_fifo_size(f);
|
||
|
AVFifoBuffer *f2 = av_fifo_alloc(new_size);
|
||
|
|
||
|
if (!f2)
|
||
|
return AVERROR(ENOMEM);
|
||
|
av_fifo_generic_read(f, f2->buffer, len, NULL);
|
||
|
f2->wptr += len;
|
||
|
f2->wndx += len;
|
||
|
av_free(f->buffer);
|
||
|
*f = *f2;
|
||
|
av_free(f2);
|
||
|
}
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int av_fifo_grow(AVFifoBuffer *f, unsigned int size)
|
||
|
{
|
||
|
unsigned int old_size = f->end - f->buffer;
|
||
|
if(size + (unsigned)av_fifo_size(f) < size)
|
||
|
return AVERROR(EINVAL);
|
||
|
|
||
|
size += av_fifo_size(f);
|
||
|
|
||
|
if (old_size < size)
|
||
|
return av_fifo_realloc2(f, FFMAX(size, 2*old_size));
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/* src must NOT be const as it can be a context for func that may need
|
||
|
* updating (like a pointer or byte counter) */
|
||
|
int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size,
|
||
|
int (*func)(void *, void *, int))
|
||
|
{
|
||
|
int total = size;
|
||
|
uint32_t wndx= f->wndx;
|
||
|
uint8_t *wptr= f->wptr;
|
||
|
|
||
|
do {
|
||
|
int len = FFMIN(f->end - wptr, size);
|
||
|
if (func) {
|
||
|
len = func(src, wptr, len);
|
||
|
if (len <= 0)
|
||
|
break;
|
||
|
} else {
|
||
|
memcpy(wptr, src, len);
|
||
|
src = (uint8_t *)src + len;
|
||
|
}
|
||
|
// Write memory barrier needed for SMP here in theory
|
||
|
wptr += len;
|
||
|
if (wptr >= f->end)
|
||
|
wptr = f->buffer;
|
||
|
wndx += len;
|
||
|
size -= len;
|
||
|
} while (size > 0);
|
||
|
f->wndx= wndx;
|
||
|
f->wptr= wptr;
|
||
|
return total - size;
|
||
|
}
|
||
|
|
||
|
int av_fifo_generic_peek_at(AVFifoBuffer *f, void *dest, int offset, int buf_size, void (*func)(void*, void*, int))
|
||
|
{
|
||
|
uint8_t *rptr = f->rptr;
|
||
|
|
||
|
av_assert2(offset >= 0);
|
||
|
|
||
|
/*
|
||
|
* *ndx are indexes modulo 2^32, they are intended to overflow,
|
||
|
* to handle *ndx greater than 4gb.
|
||
|
*/
|
||
|
av_assert2(buf_size + (unsigned)offset <= f->wndx - f->rndx);
|
||
|
|
||
|
if (offset >= f->end - rptr)
|
||
|
rptr += offset - (f->end - f->buffer);
|
||
|
else
|
||
|
rptr += offset;
|
||
|
|
||
|
while (buf_size > 0) {
|
||
|
int len;
|
||
|
|
||
|
if (rptr >= f->end)
|
||
|
rptr -= f->end - f->buffer;
|
||
|
|
||
|
len = FFMIN(f->end - rptr, buf_size);
|
||
|
if (func)
|
||
|
func(dest, rptr, len);
|
||
|
else {
|
||
|
memcpy(dest, rptr, len);
|
||
|
dest = (uint8_t *)dest + len;
|
||
|
}
|
||
|
|
||
|
buf_size -= len;
|
||
|
rptr += len;
|
||
|
}
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int av_fifo_generic_peek(AVFifoBuffer *f, void *dest, int buf_size,
|
||
|
void (*func)(void *, void *, int))
|
||
|
{
|
||
|
// Read memory barrier needed for SMP here in theory
|
||
|
uint8_t *rptr = f->rptr;
|
||
|
|
||
|
do {
|
||
|
int len = FFMIN(f->end - rptr, buf_size);
|
||
|
if (func)
|
||
|
func(dest, rptr, len);
|
||
|
else {
|
||
|
memcpy(dest, rptr, len);
|
||
|
dest = (uint8_t *)dest + len;
|
||
|
}
|
||
|
// memory barrier needed for SMP here in theory
|
||
|
rptr += len;
|
||
|
if (rptr >= f->end)
|
||
|
rptr -= f->end - f->buffer;
|
||
|
buf_size -= len;
|
||
|
} while (buf_size > 0);
|
||
|
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size,
|
||
|
void (*func)(void *, void *, int))
|
||
|
{
|
||
|
// Read memory barrier needed for SMP here in theory
|
||
|
do {
|
||
|
int len = FFMIN(f->end - f->rptr, buf_size);
|
||
|
if (func)
|
||
|
func(dest, f->rptr, len);
|
||
|
else {
|
||
|
memcpy(dest, f->rptr, len);
|
||
|
dest = (uint8_t *)dest + len;
|
||
|
}
|
||
|
// memory barrier needed for SMP here in theory
|
||
|
av_fifo_drain(f, len);
|
||
|
buf_size -= len;
|
||
|
} while (buf_size > 0);
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
/** Discard data from the FIFO. */
|
||
|
void av_fifo_drain(AVFifoBuffer *f, int size)
|
||
|
{
|
||
|
av_assert2(av_fifo_size(f) >= size);
|
||
|
f->rptr += size;
|
||
|
if (f->rptr >= f->end)
|
||
|
f->rptr -= f->end - f->buffer;
|
||
|
f->rndx += size;
|
||
|
}
|