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/* Processing Queue Management */
/*
* This file is part of gapk (GSM Audio Pocket Knife).
*
* gapk is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* gapk 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with gapk. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdint.h>
#include <stdlib.h>
#include <gapk/procqueue.h>
#define MAX_PQ_ITEMS 8
struct pq {
int n_items;
struct pq_item* items[MAX_PQ_ITEMS];
void * buffers[MAX_PQ_ITEMS+1];
};
/* crate a new (empty) processing queue */
struct pq *
pq_create(void)
{
return (struct pq *) calloc(1, sizeof(struct pq));
}
/*! destroy a processing queue, calls exit() callback of each item
* \param[in] pq Processing Queue to be destroyed */
void
pq_destroy(struct pq *pq)
{
int i;
if (!pq)
return;
for (i=0; i<pq->n_items; i++) {
if (!pq->items[i])
continue;
if (pq->items[i]->exit)
pq->items[i]->exit(pq->items[i]->state);
free(pq->items[i]);
}
for (i=0; i<pq->n_items-1; i++)
free(pq->buffers[i]); /* free is NULL safe */
free(pq);
}
/*! allocate + add an item to a processing queue; return new item
* \param[in] pq Processing Queue to which item is added
* \returns new PQ item; NULL on error */
struct pq_item *
pq_add_item(struct pq *pq)
{
struct pq_item *item;
if (pq->n_items == MAX_PQ_ITEMS)
return NULL;
item = calloc(1, sizeof(struct pq_item));
if (!item)
return NULL;
pq->items[pq->n_items++] = item;
return item;
}
/*! prepare a processing queue; allocates buffers; checks lengths
* \param[in] pq Processing Queue to be prepared
* \returns 0 on succcess; negative on error */
int
pq_prepare(struct pq *pq)
{
int i;
unsigned int len_prev;
len_prev = 0;
for (i=0; i<pq->n_items; i++) {
struct pq_item *item = pq->items[i];
if (item->len_in != len_prev)
return -EINVAL;
if (i < (pq->n_items-1)) {
pq->buffers[i] = malloc(item->len_out);
if (!pq->buffers[i])
return -ENOMEM;
} else{
if (item->len_out)
return -EINVAL;
}
len_prev = item->len_out;
}
return 0;
}
/*! execute a processing queue; iterate over processing elements
* \param[in] pq Processing Queue to be executed
* \returns 0 on success; negative on error (if any item returns negative) */
int
pq_execute(struct pq *pq)
{
int i;
void *buf_prev, *buf;
buf_prev = NULL;
for (i=0; i<pq->n_items; i++) {
int rv;
struct pq_item *item = pq->items[i];
buf = i < (pq->n_items-1) ? pq->buffers[i] : NULL;
rv = item->proc(item->state, buf, buf_prev);
if (rv)
return rv;
buf_prev = buf;
}
return 0;
}
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