libavutil/fifo.h

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #ifndef FIFO_H
  20 #define FIFO_H
  21
  22 typedef struct AVFifoBuffer {
  23     uint8_t *buffer;
  24     uint8_t *rptr, *wptr, *end;
  25 } AVFifoBuffer;
  26
  27 int av_fifo_init(AVFifoBuffer *f, int size);
  28 void av_fifo_free(AVFifoBuffer *f);
  29 int av_fifo_size(AVFifoBuffer *f);
  30 int av_fifo_read(AVFifoBuffer *f, uint8_t *buf, int buf_size);
  31 int av_fifo_generic_read(AVFifoBuffer *f, int buf_size, void (*func)(void*, void*, int), void* dest);
  32 void av_fifo_write(AVFifoBuffer *f, const uint8_t *buf, int size);
  33 void av_fifo_realloc(AVFifoBuffer *f, unsigned int size);
  34 void av_fifo_drain(AVFifoBuffer *f, int size);
  35
  36 static inline uint8_t av_fifo_peek(AVFifoBuffer *f, int offs)
  37 {
  38     uint8_t *ptr = f->rptr + offs;
  39     if (ptr >= f->end)
  40         ptr -= f->end - f->buffer;
  41     return *ptr;
  42 }
  43 #endif /* FIFO_H */