| 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 */ |