mirror of
https://gitlab.freedesktop.org/pipewire/pipewire.git
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f2dee23085
Add an EMPTY chunk flag to mark a piece of memory as 'empty'. For audio this means silence. Use the empty flag to avoid mixing 0 samples. Set the empty flag in output buffers on audioconvert.
131 lines
4.4 KiB
C
131 lines
4.4 KiB
C
/* Simple Plugin API
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* Copyright © 2018 Wim Taymans
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, 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 SPA_BUFFER_H
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#define SPA_BUFFER_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include <spa/utils/defs.h>
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#include <spa/buffer/meta.h>
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/** \defgroup spa_buffer Buffers
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*
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* Buffers describe the data and metadata that is exchanged between
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* ports of a node.
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*/
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/**
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* \addtogroup spa_buffer
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* \{
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*/
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enum spa_data_type {
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SPA_DATA_Invalid,
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SPA_DATA_MemPtr, /**< pointer to memory, the data field in
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* struct spa_data is set. */
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SPA_DATA_MemFd, /**< generic fd, mmap to get to memory */
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SPA_DATA_DmaBuf, /**< fd to dmabuf memory */
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SPA_DATA_MemId, /**< memory is identified with an id */
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_SPA_DATA_LAST, /**< not part of ABI */
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};
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/** Chunk of memory, can change for each buffer */
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struct spa_chunk {
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uint32_t offset; /**< offset of valid data. Should be taken
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* modulo the data maxsize to get the offset
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* in the data memory. */
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uint32_t size; /**< size of valid data. Should be clamped to
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* maxsize. */
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int32_t stride; /**< stride of valid data */
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#define SPA_CHUNK_FLAG_NONE 0
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#define SPA_CHUNK_FLAG_CORRUPTED (1u<<0) /**< chunk data is corrupted in some way */
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#define SPA_CHUNK_FLAG_EMPTY (1u<<1) /**< chunk data is empty with media specific
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* neutral data such as silence or black. This
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* could be used to optimize processing. */
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int32_t flags; /**< chunk flags */
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};
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/** Data for a buffer this stays constant for a buffer */
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struct spa_data {
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uint32_t type; /**< memory type, one of enum spa_data_type, when
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* allocating memory, the type contains a bitmask
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* of allowed types. SPA_ID_INVALID is a special
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* value for the allocator to indicate that the
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* other side did not explicitly specify any
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* supported data types. It should probably use
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* a memory type that does not require special
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* handling in addition to simple mmap/munmap. */
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#define SPA_DATA_FLAG_NONE 0
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#define SPA_DATA_FLAG_READABLE (1u<<0) /**< data is readable */
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#define SPA_DATA_FLAG_WRITABLE (1u<<1) /**< data is writable */
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#define SPA_DATA_FLAG_DYNAMIC (1u<<2) /**< data pointer can be changed */
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#define SPA_DATA_FLAG_READWRITE (SPA_DATA_FLAG_READABLE|SPA_DATA_FLAG_WRITABLE)
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uint32_t flags; /**< data flags */
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int64_t fd; /**< optional fd for data */
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uint32_t mapoffset; /**< offset to map fd at */
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uint32_t maxsize; /**< max size of data */
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void *data; /**< optional data pointer */
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struct spa_chunk *chunk; /**< valid chunk of memory */
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};
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/** A Buffer */
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struct spa_buffer {
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uint32_t n_metas; /**< number of metadata */
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uint32_t n_datas; /**< number of data members */
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struct spa_meta *metas; /**< array of metadata */
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struct spa_data *datas; /**< array of data members */
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};
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/** Find metadata in a buffer */
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static inline struct spa_meta *spa_buffer_find_meta(const struct spa_buffer *b, uint32_t type)
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{
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uint32_t i;
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for (i = 0; i < b->n_metas; i++)
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if (b->metas[i].type == type)
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return &b->metas[i];
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return NULL;
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}
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static inline void *spa_buffer_find_meta_data(const struct spa_buffer *b, uint32_t type, size_t size)
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{
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struct spa_meta *m;
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if ((m = spa_buffer_find_meta(b, type)) && m->size >= size)
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return m->data;
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return NULL;
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}
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/**
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* \}
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*/
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /* SPA_BUFFER_H */
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