mem.h

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/* PipeWire */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
#ifndef PIPEWIRE_MEM_H
#define PIPEWIRE_MEM_H
 
#include <pipewire/properties.h>
 
struct spa_hook;
 
#ifdef __cplusplus
extern "C" {
#endif
 
#ifndef PW_API_MEM
#define PW_API_MEM static inline
#endif
 
enum pw_memblock_flags {
        PW_MEMBLOCK_FLAG_NONE =         0,
        PW_MEMBLOCK_FLAG_READABLE =     (1 << 0),       
        PW_MEMBLOCK_FLAG_WRITABLE =     (1 << 1),       
        PW_MEMBLOCK_FLAG_SEAL =         (1 << 2),       
        PW_MEMBLOCK_FLAG_MAP =          (1 << 3),       
        PW_MEMBLOCK_FLAG_DONT_CLOSE =   (1 << 4),       
        PW_MEMBLOCK_FLAG_DONT_NOTIFY =  (1 << 5),       
        PW_MEMBLOCK_FLAG_UNMAPPABLE =   (1 << 6),       
        PW_MEMBLOCK_FLAG_READWRITE = PW_MEMBLOCK_FLAG_READABLE | PW_MEMBLOCK_FLAG_WRITABLE,
};
 
enum pw_memmap_flags {
        PW_MEMMAP_FLAG_NONE =           0,
        PW_MEMMAP_FLAG_READ =           (1 << 0),       
        PW_MEMMAP_FLAG_WRITE =          (1 << 1),       
        PW_MEMMAP_FLAG_TWICE =          (1 << 2),       
        PW_MEMMAP_FLAG_PRIVATE =        (1 << 3),       
        PW_MEMMAP_FLAG_LOCKED =         (1 << 4),       
        PW_MEMMAP_FLAG_READWRITE = PW_MEMMAP_FLAG_READ | PW_MEMMAP_FLAG_WRITE,
};
 
struct pw_memchunk;
 
struct pw_mempool {
        struct pw_properties *props;
};
 
struct pw_memblock {
        struct pw_mempool *pool;        
        uint32_t id;                    
        int ref;                        
        uint32_t flags;                 
        uint32_t type;                  
        int fd;                         
        uint32_t size;                  
        struct pw_memmap *map;          
};
 
struct pw_memmap {
        struct pw_memblock *block;      
        void *ptr;                      
        uint32_t flags;                 
        uint32_t offset;                
        uint32_t size;                  
        uint32_t tag[5];                
};
 
struct pw_mempool_events {
#define PW_VERSION_MEMPOOL_EVENTS       0
        uint32_t version;
 
        void (*destroy) (void *data);
 
        void (*added) (void *data, struct pw_memblock *block);
 
        void (*removed) (void *data, struct pw_memblock *block);
};
 
struct pw_mempool *pw_mempool_new(struct pw_properties *props);
 
void pw_mempool_add_listener(struct pw_mempool *pool,
                            struct spa_hook *listener,
                            const struct pw_mempool_events *events,
                            void *data);
 
void pw_mempool_clear(struct pw_mempool *pool);
 
void pw_mempool_destroy(struct pw_mempool *pool);
 
 
struct pw_memblock * pw_mempool_alloc(struct pw_mempool *pool,
                enum pw_memblock_flags flags, uint32_t type, size_t size);
 
struct pw_memblock * pw_mempool_import_block(struct pw_mempool *pool,
                struct pw_memblock *mem);
 
struct pw_memblock * pw_mempool_import(struct pw_mempool *pool,
                enum pw_memblock_flags flags, uint32_t type, int fd);
 
void pw_memblock_free(struct pw_memblock *mem);
 
PW_API_MEM void pw_memblock_unref(struct pw_memblock *mem)
{
        if (--mem->ref == 0)
                pw_memblock_free(mem);
}
 
int pw_mempool_remove_id(struct pw_mempool *pool, uint32_t id);
 
struct pw_memblock * pw_mempool_find_ptr(struct pw_mempool *pool, const void *ptr);
 
struct pw_memblock * pw_mempool_find_id(struct pw_mempool *pool, uint32_t id);
 
struct pw_memblock * pw_mempool_find_fd(struct pw_mempool *pool, int fd);
 
 
struct pw_memmap * pw_memblock_map(struct pw_memblock *block,
                enum pw_memmap_flags flags, uint32_t offset, uint32_t size,
                uint32_t tag[5]);
 
struct pw_memmap * pw_mempool_map_id(struct pw_mempool *pool, uint32_t id,
                enum pw_memmap_flags flags, uint32_t offset, uint32_t size,
                uint32_t tag[5]);
 
struct pw_memmap * pw_mempool_import_map(struct pw_mempool *pool,
                struct pw_mempool *other, void *data, uint32_t size, uint32_t tag[5]);
 
struct pw_memmap * pw_mempool_find_tag(struct pw_mempool *pool, uint32_t tag[5], size_t size);
 
int pw_memmap_free(struct pw_memmap *map);
 
 
struct pw_map_range {
        uint32_t start;         
        uint32_t offset;        
        uint32_t size;          
};
 
#define PW_MAP_RANGE_INIT (struct pw_map_range){ 0, }
 
PW_API_MEM int pw_map_range_init(struct pw_map_range *range,
                                     uint32_t offset, uint32_t size,
                                     uint32_t page_size)
{
        range->offset = SPA_ROUND_DOWN_N(offset, page_size);
        range->start = offset - range->offset;
        if (size > UINT32_MAX - range->start)
                return -EOVERFLOW;
        /* Check that rounding up to page_size won't overflow */
        if (range->start + size > UINT32_MAX - (page_size - 1))
                return -EOVERFLOW;
        range->size = SPA_ROUND_UP_N(range->start + size, page_size);
        return 0;
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* PIPEWIRE_MEM_H */