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Diffstat (limited to 'media/ffvpx/libavutil/buffer_internal.h')
-rw-r--r-- | media/ffvpx/libavutil/buffer_internal.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/buffer_internal.h b/media/ffvpx/libavutil/buffer_internal.h new file mode 100644 index 0000000000..adb916aaa2 --- /dev/null +++ b/media/ffvpx/libavutil/buffer_internal.h @@ -0,0 +1,110 @@ +/* + * 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 */ |