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Diffstat (limited to 'third_party/pipewire/spa/buffer/buffer.h')
| -rw-r--r-- | third_party/pipewire/spa/buffer/buffer.h | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/third_party/pipewire/spa/buffer/buffer.h b/third_party/pipewire/spa/buffer/buffer.h new file mode 100644 index 0000000000..47204acbcf --- /dev/null +++ b/third_party/pipewire/spa/buffer/buffer.h @@ -0,0 +1,131 @@ +/* Simple Plugin API + * Copyright © 2018 Wim Taymans + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +#ifndef SPA_BUFFER_H +#define SPA_BUFFER_H + +#ifdef __cplusplus +extern "C" { +#endif + +#include <spa/utils/defs.h> +#include <spa/buffer/meta.h> + +/** \defgroup spa_buffer Buffers + * + * Buffers describe the data and metadata that is exchanged between + * ports of a node. + */ + +/** + * \addtogroup spa_buffer + * \{ + */ + +enum spa_data_type { + SPA_DATA_Invalid, + SPA_DATA_MemPtr, /**< pointer to memory, the data field in + * struct spa_data is set. */ + SPA_DATA_MemFd, /**< generic fd, mmap to get to memory */ + SPA_DATA_DmaBuf, /**< fd to dmabuf memory */ + SPA_DATA_MemId, /**< memory is identified with an id */ + + _SPA_DATA_LAST, /**< not part of ABI */ +}; + +/** Chunk of memory, can change for each buffer */ +struct spa_chunk { + uint32_t offset; /**< offset of valid data. Should be taken + * modulo the data maxsize to get the offset + * in the data memory. */ + uint32_t size; /**< size of valid data. Should be clamped to + * maxsize. */ + int32_t stride; /**< stride of valid data */ +#define SPA_CHUNK_FLAG_NONE 0 +#define SPA_CHUNK_FLAG_CORRUPTED (1u<<0) /**< chunk data is corrupted in some way */ +#define SPA_CHUNK_FLAG_EMPTY (1u<<1) /**< chunk data is empty with media specific + * neutral data such as silence or black. This + * could be used to optimize processing. */ + int32_t flags; /**< chunk flags */ +}; + +/** Data for a buffer this stays constant for a buffer */ +struct spa_data { + uint32_t type; /**< memory type, one of enum spa_data_type, when + * allocating memory, the type contains a bitmask + * of allowed types. SPA_ID_INVALID is a special + * value for the allocator to indicate that the + * other side did not explicitly specify any + * supported data types. It should probably use + * a memory type that does not require special + * handling in addition to simple mmap/munmap. */ +#define SPA_DATA_FLAG_NONE 0 +#define SPA_DATA_FLAG_READABLE (1u<<0) /**< data is readable */ +#define SPA_DATA_FLAG_WRITABLE (1u<<1) /**< data is writable */ +#define SPA_DATA_FLAG_DYNAMIC (1u<<2) /**< data pointer can be changed */ +#define SPA_DATA_FLAG_READWRITE (SPA_DATA_FLAG_READABLE|SPA_DATA_FLAG_WRITABLE) + uint32_t flags; /**< data flags */ + int64_t fd; /**< optional fd for data */ + uint32_t mapoffset; /**< offset to map fd at */ + uint32_t maxsize; /**< max size of data */ + void *data; /**< optional data pointer */ + struct spa_chunk *chunk; /**< valid chunk of memory */ +}; + +/** A Buffer */ +struct spa_buffer { + uint32_t n_metas; /**< number of metadata */ + uint32_t n_datas; /**< number of data members */ + struct spa_meta *metas; /**< array of metadata */ + struct spa_data *datas; /**< array of data members */ +}; + +/** Find metadata in a buffer */ +static inline struct spa_meta *spa_buffer_find_meta(const struct spa_buffer *b, uint32_t type) +{ + uint32_t i; + + for (i = 0; i < b->n_metas; i++) + if (b->metas[i].type == type) + return &b->metas[i]; + + return NULL; +} + +static inline void *spa_buffer_find_meta_data(const struct spa_buffer *b, uint32_t type, size_t size) +{ + struct spa_meta *m; + if ((m = spa_buffer_find_meta(b, type)) && m->size >= size) + return m->data; + return NULL; +} + +/** + * \} + */ + +#ifdef __cplusplus +} /* extern "C" */ +#endif + +#endif /* SPA_BUFFER_H */ |