| /* |
| * 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" |
| |
| int av_fifo_init(AVFifoBuffer *f, unsigned int size) |
| { |
| size= FFMAX(size, size+1); |
| f->wptr = f->rptr = |
| f->buffer = av_malloc(size); |
| f->end = f->buffer + size; |
| if (!f->buffer) |
| return -1; |
| return 0; |
| } |
| |
| void av_fifo_free(AVFifoBuffer *f) |
| { |
| av_free(f->buffer); |
| } |
| |
| int av_fifo_size(AVFifoBuffer *f) |
| { |
| int size = f->wptr - f->rptr; |
| if (size < 0) |
| size += f->end - f->buffer; |
| return size; |
| } |
| |
| int av_fifo_read(AVFifoBuffer *f, uint8_t *buf, int buf_size) |
| { |
| return av_fifo_generic_read(f, buf_size, NULL, buf); |
| } |
| |
| #if LIBAVUTIL_VERSION_MAJOR < 50 |
| void av_fifo_realloc(AVFifoBuffer *f, unsigned int new_size) { |
| av_fifo_realloc2(f, new_size); |
| } |
| #endif |
| |
| 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; |
| |
| if (av_fifo_init(&f2, new_size) < 0) |
| return -1; |
| av_fifo_read(f, f2.buffer, len); |
| f2.wptr += len; |
| av_free(f->buffer); |
| *f= f2; |
| } |
| return 0; |
| } |
| |
| #if LIBAVUTIL_VERSION_MAJOR < 50 |
| void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size) |
| { |
| av_fifo_generic_write(f, (void *)buf, size, NULL); |
| } |
| #endif |
| |
| int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int (*func)(void*, void*, int)) |
| { |
| 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; |
| } |
| f->wptr += len; |
| if (f->wptr >= f->end) |
| f->wptr = f->buffer; |
| size -= len; |
| } while (size > 0); |
| return total - size; |
| } |
| |
| |
| int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest) |
| { |
| 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; |
| } |
| 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; |
| } |