69 lines
2.7 KiB
C
69 lines
2.7 KiB
C
/*
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Copyright (C) 2024 John Cox john.cox@raspberrypi.com
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation
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files (the "Software"), to deal in the Software without
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restriction, including without limitation the rights to use, copy,
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modify, merge, publish, distribute, sublicense, and/or sell copies
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of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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#ifndef AVCODEC_V4L2_REQ_DMABUFS_H
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#define AVCODEC_V4L2_REQ_DMABUFS_H
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#include <stddef.h>
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struct dmabufs_ctl;
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struct dmabuf_h;
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struct dmabufs_ctl * dmabufs_ctl_new(void);
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struct dmabufs_ctl * dmabufs_ctl_new_vidbuf_cached(void);
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void dmabufs_ctl_unref(struct dmabufs_ctl ** const pdbsc);
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struct dmabufs_ctl * dmabufs_ctl_ref(struct dmabufs_ctl * const dbsc);
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// Need not preserve old contents
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// On NULL return old buffer is freed
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struct dmabuf_h * dmabuf_realloc(struct dmabufs_ctl * dbsc, struct dmabuf_h *, size_t size);
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static inline struct dmabuf_h * dmabuf_alloc(struct dmabufs_ctl * dbsc, size_t size) {
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return dmabuf_realloc(dbsc, NULL, size);
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}
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/* Create from existing fd - dups(fd) */
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struct dmabuf_h * dmabuf_import(int fd, size_t size);
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/* Import an MMAP - return NULL if mapptr = MAP_FAIL */
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struct dmabuf_h * dmabuf_import_mmap(void * mapptr, size_t size);
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void * dmabuf_map(struct dmabuf_h * const dh);
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/* flags from linux/dmabuf.h DMA_BUF_SYNC_xxx */
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int dmabuf_sync(struct dmabuf_h * const dh, unsigned int flags);
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int dmabuf_write_start(struct dmabuf_h * const dh);
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int dmabuf_write_end(struct dmabuf_h * const dh);
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int dmabuf_read_start(struct dmabuf_h * const dh);
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int dmabuf_read_end(struct dmabuf_h * const dh);
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int dmabuf_fd(const struct dmabuf_h * const dh);
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/* Allocated size */
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size_t dmabuf_size(const struct dmabuf_h * const dh);
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/* Bytes in use */
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size_t dmabuf_len(const struct dmabuf_h * const dh);
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/* Set bytes in use */
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void dmabuf_len_set(struct dmabuf_h * const dh, const size_t len);
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void dmabuf_free(struct dmabuf_h * dh);
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#endif
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