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