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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * This file is part of FFmpeg. |
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| 3 | * |
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| 4 | * FFmpeg is free software; you can redistribute it and/or |
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| 5 | * modify it under the terms of the GNU Lesser General Public |
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| 6 | * License as published by the Free Software Foundation; either |
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| 7 | * version 2.1 of the License, or (at your option) any later version. |
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| 8 | * |
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| 9 | * FFmpeg is distributed in the hope that it will be useful, |
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| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | * Lesser General Public License for more details. |
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| 13 | * |
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| 14 | * You should have received a copy of the GNU Lesser General Public |
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| 15 | * License along with FFmpeg; if not, write to the Free Software |
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| 16 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 17 | */ |
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| 18 | |||
| 19 | #ifndef AVUTIL_BUFFER_INTERNAL_H |
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| 20 | #define AVUTIL_BUFFER_INTERNAL_H |
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| 21 | |||
| 22 | #include |
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| 23 | |||
| 24 | #include "buffer.h" |
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| 25 | |||
| 26 | /** |
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| 27 | * The buffer is always treated as read-only. |
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| 28 | */ |
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| 29 | #define BUFFER_FLAG_READONLY (1 << 0) |
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| 30 | /** |
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| 31 | * The buffer was av_realloc()ed, so it is reallocatable. |
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| 32 | */ |
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| 33 | #define BUFFER_FLAG_REALLOCATABLE (1 << 1) |
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| 34 | |||
| 35 | struct AVBuffer { |
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| 36 | uint8_t *data; /**< data described by this buffer */ |
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| 37 | int size; /**< size of data in bytes */ |
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| 38 | |||
| 39 | /** |
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| 40 | * number of existing AVBufferRef instances referring to this buffer |
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| 41 | */ |
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| 42 | volatile int refcount; |
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| 43 | |||
| 44 | /** |
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| 45 | * a callback for freeing the data |
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| 46 | */ |
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| 47 | void (*free)(void *opaque, uint8_t *data); |
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| 48 | |||
| 49 | /** |
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| 50 | * an opaque pointer, to be used by the freeing callback |
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| 51 | */ |
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| 52 | void *opaque; |
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| 53 | |||
| 54 | /** |
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| 55 | * A combination of BUFFER_FLAG_* |
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| 56 | */ |
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| 57 | int flags; |
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| 58 | }; |
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| 59 | |||
| 60 | typedef struct BufferPoolEntry { |
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| 61 | uint8_t *data; |
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| 62 | |||
| 63 | /* |
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| 64 | * Backups of the original opaque/free of the AVBuffer corresponding to |
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| 65 | * data. They will be used to free the buffer when the pool is freed. |
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| 66 | */ |
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| 67 | void *opaque; |
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| 68 | void (*free)(void *opaque, uint8_t *data); |
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| 69 | |||
| 70 | AVBufferPool *pool; |
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| 71 | struct BufferPoolEntry * volatile next; |
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| 72 | } BufferPoolEntry; |
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| 73 | |||
| 74 | struct AVBufferPool { |
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| 75 | BufferPoolEntry * volatile pool; |
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| 76 | |||
| 77 | /* |
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| 78 | * This is used to track when the pool is to be freed. |
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| 79 | * The pointer to the pool itself held by the caller is considered to |
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| 80 | * be one reference. Each buffer requested by the caller increases refcount |
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| 81 | * by one, returning the buffer to the pool decreases it by one. |
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| 82 | * refcount reaches zero when the buffer has been uninited AND all the |
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| 83 | * buffers have been released, then it's safe to free the pool and all |
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| 84 | * the buffers in it. |
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| 85 | */ |
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| 86 | volatile int refcount; |
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| 87 | |||
| 88 | volatile int nb_allocated; |
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| 89 | |||
| 90 | int size; |
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| 91 | AVBufferRef* (*alloc)(int size); |
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| 92 | }; |
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| 93 | |||
| 94 | #endif /* AVUTIL_BUFFER_INTERNAL_H */ |