buffer.h

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/* Simple Plugin API */
/* SPDX-FileCopyrightText: Copyright © 2018 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
#ifndef SPA_BUFFER_H
#define SPA_BUFFER_H
 
#include <spa/utils/defs.h>
#include <spa/buffer/meta.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
#ifndef SPA_API_BUFFER
 #ifdef SPA_API_IMPL
  #define SPA_API_BUFFER SPA_API_IMPL
 #else
  #define SPA_API_BUFFER static inline
 #endif
#endif


 
enum spa_data_type {
        SPA_DATA_Invalid,
        SPA_DATA_MemPtr,                
        SPA_DATA_MemFd,                 
        SPA_DATA_DmaBuf,                
                                          *  normally be handled with DMABUF apis. */
        SPA_DATA_MemId,                 
        SPA_DATA_SyncObj,               
 
        _SPA_DATA_LAST,                 
};

struct spa_chunk {
        uint32_t offset;                
        uint32_t size;                  

        int32_t stride;                 
#define SPA_CHUNK_FLAG_NONE             0
#define SPA_CHUNK_FLAG_CORRUPTED        (1u<<0) 
#define SPA_CHUNK_FLAG_EMPTY            (1u<<1) 
        int32_t flags;                  
};

struct spa_data {
        uint32_t type;                  

#define SPA_DATA_FLAG_NONE       0
#define SPA_DATA_FLAG_READABLE  (1u<<0) 
#define SPA_DATA_FLAG_WRITABLE  (1u<<1) 
#define SPA_DATA_FLAG_DYNAMIC   (1u<<2) 
#define SPA_DATA_FLAG_READWRITE (SPA_DATA_FLAG_READABLE|SPA_DATA_FLAG_WRITABLE)
#define SPA_DATA_FLAG_MAPPABLE  (1u<<3) 
        uint32_t flags;                 
        int64_t fd;                     
        uint32_t mapoffset;             
        uint32_t maxsize;               
        void *data;                     
        struct spa_chunk *chunk;        
};

struct spa_buffer {
        uint32_t n_metas;               
        uint32_t n_datas;               
        struct spa_meta *metas;         
        struct spa_data *datas;         
};

SPA_API_BUFFER 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;
}
 
SPA_API_BUFFER 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;
}
 
SPA_API_BUFFER bool spa_buffer_has_meta_features(const struct spa_buffer *b, uint32_t type, uint32_t features)
{
        uint32_t i;
        for (i = 0; i < b->n_metas; i++) {
                uint32_t t = b->metas[i].type;
                if ((t >> 16) == type && (t & features) == features)
                        return true;
        }
        return false;
}

 
#ifdef __cplusplus
}  /* extern "C" */
#endif
 
#endif /* SPA_BUFFER_H */