mirror of https://git.ffmpeg.org/ffmpeg.git
90 lines
3.3 KiB
C
90 lines
3.3 KiB
C
/*
|
|
* 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
|
|
*/
|
|
|
|
#ifndef AVCODEC_CONTAINER_FIFO_H
|
|
#define AVCODEC_CONTAINER_FIFO_H
|
|
|
|
#include <stddef.h>
|
|
|
|
/**
|
|
* ContainerFifo is a FIFO for "containers" - dynamically allocated reusable
|
|
* structs (e.g. AVFrame or AVPacket). ContainerFifo uses an internal pool of
|
|
* such containers to avoid allocating and freeing them repeatedly.
|
|
*/
|
|
typedef struct ContainerFifo ContainerFifo;
|
|
|
|
/**
|
|
* Allocate a new ContainerFifo for the container type defined by provided
|
|
* callbacks.
|
|
*
|
|
* @param container_alloc allocate a new container instance and return a pointer
|
|
* to it, or NULL on failure
|
|
* @param container_reset reset the provided container instance to a clean state
|
|
* @param container_free free the provided container instance
|
|
* @param fifo_write transfer the contents of src to dst, where src is a
|
|
* container instance provided to ff_container_fifo_write()
|
|
* @param fifo_read transfer the contents of src to dst in other cases
|
|
*
|
|
* @note fifo_read() and fifo_write() are different parameters in order to allow
|
|
* fifo_write() implementations that make a new reference in dst, leaving
|
|
* src untouched (see e.g. ff_container_fifo_alloc_avframe())
|
|
*/
|
|
ContainerFifo*
|
|
ff_container_fifo_alloc(void* (*container_alloc)(void),
|
|
void (*container_reset)(void *obj),
|
|
void (*container_free) (void *obj),
|
|
int (*fifo_write) (void *dst, void *src),
|
|
int (*fifo_read) (void *dst, void *src));
|
|
|
|
/**
|
|
* Allocate a ContainerFifo instance for AVFrames.
|
|
* Note that ff_container_fifo_write() will call av_frame_ref() on src, making a
|
|
* new reference in dst and leaving src untouched.
|
|
*
|
|
* @param flags unused currently
|
|
*/
|
|
ContainerFifo *ff_container_fifo_alloc_avframe(unsigned flags);
|
|
|
|
/**
|
|
* Free a ContainerFifo and everything in it.
|
|
*/
|
|
void ff_container_fifo_free(ContainerFifo **pf);
|
|
|
|
/**
|
|
* Write the contents of obj to the FIFO.
|
|
*
|
|
* The fifo_write() callback previously provided to ff_container_fifo_alloc()
|
|
* will be called with obj as src in order to perform the actual transfer.
|
|
*/
|
|
int ff_container_fifo_write(ContainerFifo *pf, void *obj);
|
|
|
|
/**
|
|
* Read the next available object from the FIFO into obj.
|
|
*
|
|
* The fifo_read() callback previously provided to ff_container_fifo_alloc()
|
|
* will be called with obj as dst in order to perform the actual transfer.
|
|
*/
|
|
int ff_container_fifo_read(ContainerFifo *pf, void *obj);
|
|
|
|
/**
|
|
* @return number of objects available for reading
|
|
*/
|
|
size_t ff_container_fifo_can_read(ContainerFifo *pf);
|
|
|
|
#endif // AVCODEC_CONTAINER_FIFO_H
|