/* * 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 AVUTIL_BUFFER_INTERNAL_H #define AVUTIL_BUFFER_INTERNAL_H #include <stdatomic.h> #include <stdint.h> #include "buffer.h" #include "thread.h" /** * The buffer was av_realloc()ed, so it is reallocatable. */ #define BUFFER_FLAG_REALLOCATABLE (1 << 0) /** * The AVBuffer structure is part of a larger structure * and should not be freed. */ #define BUFFER_FLAG_NO_FREE (1 << 1) struct AVBuffer { uint8_t *data; /**< data described by this buffer */ size_t size; /**< size of data in bytes */ /** * number of existing AVBufferRef instances referring to this buffer */ atomic_uint refcount; /** * a callback for freeing the data */ void (*free)(void *opaque, uint8_t *data); /** * an opaque pointer, to be used by the freeing callback */ void *opaque; /** * A combination of AV_BUFFER_FLAG_* */ int flags; /** * A combination of BUFFER_FLAG_* */ int flags_internal; }; typedef struct BufferPoolEntry { uint8_t *data; /* * Backups of the original opaque/free of the AVBuffer corresponding to * data. They will be used to free the buffer when the pool is freed. */ void *opaque; void (*free)(void *opaque, uint8_t *data); AVBufferPool *pool; struct BufferPoolEntry *next; /* * An AVBuffer structure to (re)use as AVBuffer for subsequent uses * of this BufferPoolEntry. */ AVBuffer buffer; } BufferPoolEntry; struct AVBufferPool { AVMutex mutex; BufferPoolEntry *pool; /* * This is used to track when the pool is to be freed. * The pointer to the pool itself held by the caller is considered to * be one reference. Each buffer requested by the caller increases refcount * by one, returning the buffer to the pool decreases it by one. * refcount reaches zero when the buffer has been uninited AND all the * buffers have been released, then it's safe to free the pool and all * the buffers in it. */ atomic_uint refcount; size_t size; void *opaque; AVBufferRef* (*alloc)(size_t size); AVBufferRef* (*alloc2)(void *opaque, size_t size); void (*pool_free)(void *opaque); }; #endif /* AVUTIL_BUFFER_INTERNAL_H */