/*
- * A very simple circular buffer FIFO implementation
+ * a very simple circular buffer FIFO implementation
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
* Copyright (c) 2006 Roman Shaposhnik
*
- * This library is free software; you can redistribute it and/or
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * 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 this library; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "common.h"
#include "fifo.h"
-int av_fifo_init(AVFifoBuffer *f, int size)
+AVFifoBuffer *av_fifo_alloc(unsigned int size)
{
+ AVFifoBuffer *f= av_mallocz(sizeof(AVFifoBuffer));
+ if(!f)
+ return NULL;
f->buffer = av_malloc(size);
- if (!f->buffer)
- return -1;
f->end = f->buffer + size;
- f->wptr = f->rptr = f->buffer;
- return 0;
+ av_fifo_reset(f);
+ if (!f->buffer)
+ av_freep(&f);
+ return f;
}
void av_fifo_free(AVFifoBuffer *f)
{
- av_free(f->buffer);
+ if(f){
+ av_free(f->buffer);
+ av_free(f);
+ }
}
-int av_fifo_size(AVFifoBuffer *f)
+void av_fifo_reset(AVFifoBuffer *f)
{
- int size = f->wptr - f->rptr;
- if (size < 0)
- size += f->end - f->buffer;
- return size;
+ f->wptr = f->rptr = f->buffer;
+ f->wndx = f->rndx = 0;
}
-/**
- * Get data from the fifo (returns -1 if not enough data).
- */
-int av_fifo_read(AVFifoBuffer *f, uint8_t *buf, int buf_size)
+int av_fifo_size(AVFifoBuffer *f)
{
- int len;
- int size = f->wptr - f->rptr;
- if (size < 0)
- size += f->end - f->buffer;
+ return (uint32_t)(f->wndx - f->rndx);
+}
- if (size < buf_size)
- return -1;
- while (buf_size > 0) {
- len = FFMIN(f->end - f->rptr, buf_size);
- memcpy(buf, f->rptr, len);
- buf += len;
- f->rptr += len;
- if (f->rptr >= f->end)
- f->rptr = f->buffer;
- buf_size -= len;
- }
- return 0;
+int av_fifo_space(AVFifoBuffer *f)
+{
+ return f->end - f->buffer - av_fifo_size(f);
}
-/**
- * Resizes a FIFO.
- */
-void av_fifo_realloc(AVFifoBuffer *f, unsigned int new_size) {
+int av_fifo_realloc2(AVFifoBuffer *f, unsigned int new_size) {
unsigned int old_size= f->end - f->buffer;
if(old_size < new_size){
- uint8_t *old= f->buffer;
-
- f->buffer= av_realloc(f->buffer, new_size);
-
- f->rptr += f->buffer - old;
- f->wptr += f->buffer - old;
-
- if(f->wptr < f->rptr){
- memmove(f->rptr + new_size - old_size, f->rptr, f->buffer + old_size - f->rptr);
- f->rptr += new_size - old_size;
- }
- f->end= f->buffer + new_size;
+ int len= av_fifo_size(f);
+ AVFifoBuffer *f2= av_fifo_alloc(new_size);
+
+ if (!f2)
+ return -1;
+ 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;
}
-void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size)
+int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int (*func)(void*, void*, int))
{
- int len;
-
- while (size > 0) {
- len = FFMIN(f->end - f->wptr, size);
- memcpy(f->wptr, buf, len);
+ int total = size;
+ do {
+ int len = FFMIN(f->end - f->wptr, size);
+ if(func) {
+ if(func(src, f->wptr, len) <= 0)
+ break;
+ } else {
+ memcpy(f->wptr, src, len);
+ src = (uint8_t*)src + len;
+ }
+// Write memory barrier needed for SMP here in theory
f->wptr += len;
if (f->wptr >= f->end)
f->wptr = f->buffer;
- buf += len;
+ f->wndx += len;
size -= len;
- }
+ } while (size > 0);
+ return total - size;
}
-/* get data from the fifo (return -1 if not enough data) */
-int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest)
+int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size, void (*func)(void*, void*, int))
{
- int len;
- int size = f->wptr - f->rptr;
- if (size < 0)
- size += f->end - f->buffer;
-
- if (size < buf_size)
- return -1;
- while (buf_size > 0) {
- len = FFMIN(f->end - f->rptr, buf_size);
- func(dest, f->rptr, len);
- f->rptr += len;
- if (f->rptr >= f->end)
- f->rptr = f->buffer;
+// 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 */
+/** Discard data from the FIFO. */
void av_fifo_drain(AVFifoBuffer *f, int size)
{
f->rptr += size;
if (f->rptr >= f->end)
f->rptr -= f->end - f->buffer;
+ f->rndx += size;
}
projects / frescor / ffmpeg.git / blobdiff