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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. #include "thread.h"
  26.  
  27. /**
  28.  * The buffer is always treated as read-only.
  29.  */
  30. #define BUFFER_FLAG_READONLY      (1 << 0)
  31. /**
  32.  * The buffer was av_realloc()ed, so it is reallocatable.
  33.  */
  34. #define BUFFER_FLAG_REALLOCATABLE (1 << 1)
  35.  
  36. struct AVBuffer {
  37.     uint8_t *data; /**< data described by this buffer */
  38.     int      size; /**< size of data in bytes */
  39.  
  40.     /**
  41.      *  number of existing AVBufferRef instances referring to this buffer
  42.      */
  43.     volatile int refcount;
  44.  
  45.     /**
  46.      * a callback for freeing the data
  47.      */
  48.     void (*free)(void *opaque, uint8_t *data);
  49.  
  50.     /**
  51.      * an opaque pointer, to be used by the freeing callback
  52.      */
  53.     void *opaque;
  54.  
  55.     /**
  56.      * A combination of BUFFER_FLAG_*
  57.      */
  58.     int flags;
  59. };
  60.  
  61. typedef struct BufferPoolEntry {
  62.     uint8_t *data;
  63.  
  64.     /*
  65.      * Backups of the original opaque/free of the AVBuffer corresponding to
  66.      * data. They will be used to free the buffer when the pool is freed.
  67.      */
  68.     void *opaque;
  69.     void (*free)(void *opaque, uint8_t *data);
  70.  
  71.     AVBufferPool *pool;
  72.     struct BufferPoolEntry *next;
  73. } BufferPoolEntry;
  74.  
  75. struct AVBufferPool {
  76.     AVMutex mutex;
  77.     BufferPoolEntry *pool;
  78.  
  79.     /*
  80.      * This is used to track when the pool is to be freed.
  81.      * The pointer to the pool itself held by the caller is considered to
  82.      * be one reference. Each buffer requested by the caller increases refcount
  83.      * by one, returning the buffer to the pool decreases it by one.
  84.      * refcount reaches zero when the buffer has been uninited AND all the
  85.      * buffers have been released, then it's safe to free the pool and all
  86.      * the buffers in it.
  87.      */
  88.     volatile int refcount;
  89.  
  90.     volatile int nb_allocated;
  91.  
  92.     int size;
  93.     AVBufferRef* (*alloc)(int size);
  94. };
  95.  
  96. #endif /* AVUTIL_BUFFER_INTERNAL_H */
  97.