diff options
| author | Tim Redfern <tim@eclectronics.org> | 2013-09-05 17:55:35 +0100 |
|---|---|---|
| committer | Tim Redfern <tim@eclectronics.org> | 2013-09-05 17:55:35 +0100 |
| commit | 741fb4b9e135cfb161a749db88713229038577bb (patch) | |
| tree | 08bc9925659cbcac45162bacf31dc6336d4f60b4 /ffmpeg1/libavutil/fifo.c | |
| parent | a2e1bf3495b7bfefdaedb8fc737e969ab06df079 (diff) | |
making act segmenter
Diffstat (limited to 'ffmpeg1/libavutil/fifo.c')
| -rw-r--r-- | ffmpeg1/libavutil/fifo.c | 182 |
1 files changed, 0 insertions, 182 deletions
diff --git a/ffmpeg1/libavutil/fifo.c b/ffmpeg1/libavutil/fifo.c deleted file mode 100644 index bafa9e9..0000000 --- a/ffmpeg1/libavutil/fifo.c +++ /dev/null @@ -1,182 +0,0 @@ -/* - * 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 "common.h" -#include "fifo.h" - -AVFifoBuffer *av_fifo_alloc(unsigned int size) -{ - AVFifoBuffer *f= av_mallocz(sizeof(AVFifoBuffer)); - if (!f) - return NULL; - f->buffer = av_malloc(size); - f->end = f->buffer + size; - av_fifo_reset(f); - if (!f->buffer) - av_freep(&f); - return f; -} - -void av_fifo_free(AVFifoBuffer *f) -{ - if (f) { - av_freep(&f->buffer); - av_free(f); - } -} - -void av_fifo_reset(AVFifoBuffer *f) -{ - f->wptr = f->rptr = f->buffer; - f->wndx = f->rndx = 0; -} - -int av_fifo_size(AVFifoBuffer *f) -{ - return (uint32_t)(f->wndx - f->rndx); -} - -int av_fifo_space(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*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) { - if (func(src, wptr, 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_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) -{ - f->rptr += size; - if (f->rptr >= f->end) - f->rptr -= f->end - f->buffer; - f->rndx += size; -} - -#ifdef TEST - -int main(void) -{ - /* create a FIFO buffer */ - AVFifoBuffer *fifo = av_fifo_alloc(13 * sizeof(int)); - int i, j, n; - - /* fill data */ - for (i = 0; av_fifo_space(fifo) >= sizeof(int); i++) - av_fifo_generic_write(fifo, &i, sizeof(int), NULL); - - /* peek at FIFO */ - n = av_fifo_size(fifo)/sizeof(int); - for (i = -n+1; i < n; i++) { - int *v = (int *)av_fifo_peek2(fifo, i*sizeof(int)); - printf("%d: %d\n", i, *v); - } - printf("\n"); - - /* read data */ - for (i = 0; av_fifo_size(fifo) >= sizeof(int); i++) { - av_fifo_generic_read(fifo, &j, sizeof(int), NULL); - printf("%d ", j); - } - printf("\n"); - - av_fifo_free(fifo); - - return 0; -} - -#endif |
