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  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 AVUTIL_BUFFER_INTERNAL_H
  20. #define AVUTIL_BUFFER_INTERNAL_H
  21.  
  22. #include <stdint.h>
  23.  
  24. #include "buffer.h"
  25.  
  26. /**
  27.  * The buffer is always treated as read-only.
  28.  */
  29. #define BUFFER_FLAG_READONLY      (1 << 0)
  30. /**
  31.  * The buffer was av_realloc()ed, so it is reallocatable.
  32.  */
  33. #define BUFFER_FLAG_REALLOCATABLE (1 << 1)
  34.  
  35. struct AVBuffer {
  36.     uint8_t *data; /**< data described by this buffer */
  37.     int      size; /**< size of data in bytes */
  38.  
  39.     /**
  40.      *  number of existing AVBufferRef instances referring to this buffer
  41.      */
  42.     volatile int refcount;
  43.  
  44.     /**
  45.      * a callback for freeing the data
  46.      */
  47.     void (*free)(void *opaque, uint8_t *data);
  48.  
  49.     /**
  50.      * an opaque pointer, to be used by the freeing callback
  51.      */
  52.     void *opaque;
  53.  
  54.     /**
  55.      * A combination of BUFFER_FLAG_*
  56.      */
  57.     int flags;
  58. };
  59.  
  60. typedef struct BufferPoolEntry {
  61.     uint8_t *data;
  62.  
  63.     /*
  64.      * Backups of the original opaque/free of the AVBuffer corresponding to
  65.      * data. They will be used to free the buffer when the pool is freed.
  66.      */
  67.     void *opaque;
  68.     void (*free)(void *opaque, uint8_t *data);
  69.  
  70.     AVBufferPool *pool;
  71.     struct BufferPoolEntry * volatile next;
  72. } BufferPoolEntry;
  73.  
  74. struct AVBufferPool {
  75.     BufferPoolEntry * volatile pool;
  76.  
  77.     /*
  78.      * This is used to track when the pool is to be freed.
  79.      * The pointer to the pool itself held by the caller is considered to
  80.      * be one reference. Each buffer requested by the caller increases refcount
  81.      * by one, returning the buffer to the pool decreases it by one.
  82.      * refcount reaches zero when the buffer has been uninited AND all the
  83.      * buffers have been released, then it's safe to free the pool and all
  84.      * the buffers in it.
  85.      */
  86.     volatile int refcount;
  87.  
  88.     volatile int nb_allocated;
  89.  
  90.     int size;
  91.     AVBufferRef* (*alloc)(int size);
  92. };
  93.  
  94. #endif /* AVUTIL_BUFFER_INTERNAL_H */
  95.