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buffer-alloc: add helpers for buffer allocation

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Add some helpers to calculate buffers memory sizes and
construct buffer structures in memory.
This commit is contained in:
Wim Taymans 2018-04-06 17:44:33 +02:00
parent b171361204
commit 19067dde17
1 changed files with 195 additions and 0 deletions
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195
spa/include/spa/buffer/alloc.h Normal file
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/* Simple Plugin API
* Copyright (C) 2018 Wim Taymans <wim.taymans@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __SPA_BUFFER_ALLOC_H__
#define __SPA_BUFFER_ALLOC_H__
#ifdef __cplusplus
extern "C" {
#endif
#include <spa/buffer/buffer.h>
struct spa_buffer_alloc_info {
#define SPA_BUFFER_ALLOC_FLAG_INLINE_META (1<<0) /**< add metadata data in the skeleton */
#define SPA_BUFFER_ALLOC_FLAG_INLINE_CHUNK (1<<1) /**< add chunk data in the skeleton */
#define SPA_BUFFER_ALLOC_FLAG_INLINE_DATA (1<<2) /**< add buffer data to the skeleton */
uint32_t flags;
uint32_t n_metas;
uint32_t *meta_sizes;
uint32_t n_datas;
uint32_t *data_sizes;
uint32_t *data_aligns;
size_t skel_size; /**< size of the struct spa_buffer */
size_t data_size; /**< size of the metadata/chunk/data if not inlined */
};
static inline int spa_buffer_alloc_fill_info(struct spa_buffer_alloc_info *info,
uint32_t n_metas, uint32_t meta_sizes[n_metas],
uint32_t n_datas, uint32_t data_sizes[n_datas],
uint32_t data_aligns[n_datas])
{
size_t size;
int i;
info->n_metas = n_metas;
info->meta_sizes = meta_sizes;
info->n_datas = n_datas;
info->data_sizes = data_sizes;
info->data_aligns = data_aligns;
info->skel_size = sizeof(struct spa_buffer);
info->skel_size += n_metas * sizeof(struct spa_meta);
info->skel_size += n_datas * sizeof(struct spa_data);
for (i = 0, size = 0; i < n_metas; i++)
size += meta_sizes[i];
if (SPA_FLAG_CHECK(info->flags, SPA_BUFFER_ALLOC_FLAG_INLINE_META))
info->skel_size += size;
else
info->data_size += size;
size = n_datas * sizeof(struct spa_chunk);
if (SPA_FLAG_CHECK(info->flags, SPA_BUFFER_ALLOC_FLAG_INLINE_CHUNK))
info->skel_size += size;
else
info->data_size += size;
for (i = 0, size = 0; i < n_datas; i++)
size += data_sizes[i];
if (SPA_FLAG_CHECK(info->flags, SPA_BUFFER_ALLOC_FLAG_INLINE_DATA))
info->skel_size += size;
else
info->data_size += size;
return 0;
}
static inline struct spa_buffer *
spa_buffer_alloc_layout(struct spa_buffer_alloc_info *info,
void *skel_mem, void *data_mem, uint32_t id, uint32_t mem_type)
{
struct spa_buffer *b = skel_mem;
size_t size;
int i;
void **dp, *skel, *data;
struct spa_chunk *cp;
b->id = id;
b->n_metas = info->n_metas;
b->metas = SPA_MEMBER(b, sizeof(struct spa_buffer), struct spa_meta);
b->n_datas = info->n_datas;
b->datas = SPA_MEMBER(b->metas, info->n_metas * sizeof(struct spa_meta), struct spa_data);
skel = SPA_MEMBER(b->datas, info->n_datas * sizeof(struct spa_data), void);
data = data_mem;
if (SPA_FLAG_CHECK(info->flags, SPA_BUFFER_ALLOC_FLAG_INLINE_META))
dp = &skel;
else
dp = &data;
for (i = 0; i < info->n_metas; i++) {
struct spa_meta *m = &b->metas[i];
m->size = info->meta_sizes[i];
m->data = *dp;
*dp += m->size;
}
size = info->n_datas * sizeof(struct spa_chunk);
if (SPA_FLAG_CHECK(info->flags, SPA_BUFFER_ALLOC_FLAG_INLINE_CHUNK)) {
cp = skel;
skel += size;
}
else {
cp = data;
data += size;
}
if (SPA_FLAG_CHECK(info->flags, SPA_BUFFER_ALLOC_FLAG_INLINE_DATA))
dp = &skel;
else
dp = &data;
for (i = 0; i < info->n_datas; i++) {
struct spa_data *d = &b->datas[i];
d->chunk = &cp[i];
d->type = mem_type;
if (info->data_sizes[i] > 0) {
d->data = *dp;
d->maxsize = info->data_sizes[i];
*dp += d->maxsize;
}
}
return b;
}
static inline int
spa_buffer_alloc_layout_array(struct spa_buffer_alloc_info *info,
uint32_t n_buffers, struct spa_buffer *buffers[n_buffers],
void *skel_mem, void *data_mem, uint32_t mem_type)
{
int i;
for (i = 0; i < n_buffers; i++) {
buffers[i] = spa_buffer_alloc_layout(info, skel_mem, data_mem, i, mem_type);
skel_mem = SPA_MEMBER(skel_mem, info->skel_size, void);
data_mem = SPA_MEMBER(data_mem, info->data_size, void);
}
return 0;
}
static inline struct spa_buffer **
spa_buffer_alloc_array(uint32_t n_buffers, uint32_t mem_type,
uint32_t n_metas, uint32_t meta_sizes[n_metas],
uint32_t n_datas, uint32_t data_sizes[n_datas],
uint32_t data_aligns[n_datas])
{
size_t size;
struct spa_buffer **buffers;
struct spa_buffer_alloc_info info = { 0, };
void *skel;
info.flags = SPA_BUFFER_ALLOC_FLAG_INLINE_META |
SPA_BUFFER_ALLOC_FLAG_INLINE_CHUNK |
SPA_BUFFER_ALLOC_FLAG_INLINE_DATA;
spa_buffer_alloc_fill_info(&info, n_metas, meta_sizes, n_datas, data_sizes, data_aligns);
info.skel_size = SPA_ROUND_UP_N(info.skel_size, 16);
size = sizeof(struct spa_buffer *) + info.skel_size;
buffers = calloc(n_buffers, size);
skel = SPA_MEMBER(buffers, sizeof(struct spa_buffer *) * n_buffers, void);
spa_buffer_alloc_layout_array(&info, n_buffers, buffers, skel, NULL, mem_type);
return buffers;
}
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* __SPA_BUFFER_ALLOC_H__ */