author | Wuzzy <almikes@aol.com> |
Sat, 15 Apr 2017 06:52:14 +0200 | |
changeset 12256 | 789277d46784 |
parent 7813 | 7ac83d79b897 |
permissions | -rw-r--r-- |
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/* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* a very simple circular buffer FIFO implementation |
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*/ |
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#ifndef AVUTIL_FIFO_H |
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#define AVUTIL_FIFO_H |
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#include <stdint.h> |
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#include "avutil.h" |
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#include "attributes.h" |
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typedef struct AVFifoBuffer { |
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uint8_t *buffer; |
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uint8_t *rptr, *wptr, *end; |
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uint32_t rndx, wndx; |
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} AVFifoBuffer; |
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/** |
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* Initialize an AVFifoBuffer. |
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* @param size of FIFO |
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* @return AVFifoBuffer or NULL in case of memory allocation failure |
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*/ |
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AVFifoBuffer *av_fifo_alloc(unsigned int size); |
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/** |
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* Free an AVFifoBuffer. |
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* @param f AVFifoBuffer to free |
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*/ |
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void av_fifo_free(AVFifoBuffer *f); |
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/** |
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* Reset the AVFifoBuffer to the state right after av_fifo_alloc, in particular it is emptied. |
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* @param f AVFifoBuffer to reset |
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*/ |
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void av_fifo_reset(AVFifoBuffer *f); |
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/** |
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* Return the amount of data in bytes in the AVFifoBuffer, that is the |
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* amount of data you can read from it. |
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* @param f AVFifoBuffer to read from |
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* @return size |
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*/ |
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int av_fifo_size(AVFifoBuffer *f); |
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/** |
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* Return the amount of space in bytes in the AVFifoBuffer, that is the |
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* amount of data you can write into it. |
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* @param f AVFifoBuffer to write into |
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* @return size |
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*/ |
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int av_fifo_space(AVFifoBuffer *f); |
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/** |
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* Feed data from an AVFifoBuffer to a user-supplied callback. |
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* @param f AVFifoBuffer to read from |
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* @param buf_size number of bytes to read |
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* @param func generic read function |
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* @param dest data destination |
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*/ |
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int av_fifo_generic_read(AVFifoBuffer *f, void *dest, int buf_size, void (*func)(void*, void*, int)); |
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/** |
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* Feed data from a user-supplied callback to an AVFifoBuffer. |
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* @param f AVFifoBuffer to write to |
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* @param src data source; non-const since it may be used as a |
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* modifiable context by the function defined in func |
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* @param size number of bytes to write |
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* @param func generic write function; the first parameter is src, |
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* the second is dest_buf, the third is dest_buf_size. |
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* func must return the number of bytes written to dest_buf, or <= 0 to |
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* indicate no more data available to write. |
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* If func is NULL, src is interpreted as a simple byte array for source data. |
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* @return the number of bytes written to the FIFO |
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*/ |
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int av_fifo_generic_write(AVFifoBuffer *f, void *src, int size, int (*func)(void*, void*, int)); |
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/** |
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* Resize an AVFifoBuffer. |
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* @param f AVFifoBuffer to resize |
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* @param size new AVFifoBuffer size in bytes |
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* @return <0 for failure, >=0 otherwise |
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*/ |
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int av_fifo_realloc2(AVFifoBuffer *f, unsigned int size); |
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/** |
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* Read and discard the specified amount of data from an AVFifoBuffer. |
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* @param f AVFifoBuffer to read from |
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* @param size amount of data to read in bytes |
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*/ |
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void av_fifo_drain(AVFifoBuffer *f, int size); |
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/** |
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* Return a pointer to the data stored in a FIFO buffer at a certain offset. |
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* The FIFO buffer is not modified. |
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* |
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* @param f AVFifoBuffer to peek at, f must be non-NULL |
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* @param offs an offset in bytes, its absolute value must be less |
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* than the used buffer size or the returned pointer will |
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* point outside to the buffer data. |
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* The used buffer size can be checked with av_fifo_size(). |
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*/ |
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static inline uint8_t *av_fifo_peek2(const AVFifoBuffer *f, int offs) |
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{ |
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uint8_t *ptr = f->rptr + offs; |
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if (ptr >= f->end) |
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ptr = f->buffer + (ptr - f->end); |
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else if (ptr < f->buffer) |
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ptr = f->end - (f->buffer - ptr); |
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return ptr; |
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} |
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#if FF_API_AV_FIFO_PEEK |
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/** |
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* @deprecated Use av_fifo_peek2() instead. |
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*/ |
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attribute_deprecated |
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static inline uint8_t av_fifo_peek(AVFifoBuffer *f, int offs) |
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{ |
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return *av_fifo_peek2(f, offs); |
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} |
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#endif |
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#endif /* AVUTIL_FIFO_H */ |