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/*
* mfc codec encoding example application
* Andrzej Hajda <a.hajda@samsung.com>
*
* func I/O device implementation.
*
* Copyright 2012 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <stdlib.h>
#include <unistd.h>
#include "io_dev.h"
#include "func_dev.h"
#include "mfc.h"
int func_req_bufs(struct io_dev *dev, enum io_dir dir, int nelem)
{
struct ring_buffer *rb;
rb = malloc(sizeof(*rb) + (nelem + 1) * sizeof(rb->data[0]));
rb->begin = 0;
rb->end = 0;
rb->size = nelem + 1;
dev->io[dir].queue = rb;
dbg("Succesfully requested %d buffers for device %d:%d", nelem,
dev->fd, dir);
return nelem;
}
int func_deq_buf(struct io_dev *dev, enum io_dir dir)
{
int i;
struct dev_buffers *bufs;
int ret;
int lens[MFC_MAX_PLANES];
struct ring_buffer *q;
int idx;
int (*func)(struct io_dev *dev, int nbufs, char **bufs, int *lens);
q = dev->io[dir].queue;
if (q->begin == q->end)
return -1;
idx = q->data[q->begin++];
q->begin %= q->size;
bufs = dev->io[dir].bufs;
for (i = 0; i < bufs->nplanes; ++i)
lens[i] = (dir == DIR_IN) ?
bufs->bytesused[bufs->nplanes * idx + i] :
bufs->lengths[i];
func = (dir == DIR_OUT) ? dev->ops->read : dev->ops->write;
ret = func(dev, bufs->nplanes, &bufs->addr[bufs->nplanes * idx], lens);
for (i = 0; i < bufs->nplanes; ++i)
bufs->bytesused[bufs->nplanes * idx + i] = lens[i];
dbg("Dequeued buffer %d/%d from %d:%d ret=%d", idx, bufs->count, dev->fd, dir, ret);
--dev->io[dir].nbufs;
++dev->io[dir].counter;
if (ret < 0 || (dev->io[dir].limit &&
dev->io[dir].limit <= dev->io[dir].counter)) {
dev->io[dir].state = FS_END;
dbg("End on %d:%d", dev->fd, dir);
} else if (q->begin == q->end) {
dev->io[dir].state = FS_OFF;
} else if (dev->fd >= 0) {
dev->io[dir].state = FS_BUSY;
}
return idx;
}
int func_enq_buf(struct io_dev *dev, enum io_dir dir, int idx)
{
struct ring_buffer *q;
q = dev->io[dir].queue;
q->data[q->end++] = idx;
q->end %= q->size;
++dev->io[dir].nbufs;
if (dev->io[dir].state == FS_OFF)
dev->io[dir].state = dev->fd >= 0 ? FS_BUSY : FS_READY;
else if (dev->io[dir].state == FS_BUSY && dev->fd < 0)
dev->io[dir].state = FS_READY;
dbg("Enqueued buffer %d/%d to %d:%d", idx, q->size - 1, dev->fd, dir);
return 0;
}
int func_destroy(struct io_dev *dev)
{
if (dev->io[DIR_IN].type == IO_FUNC)
free(dev->io[DIR_IN].queue);
if (dev->io[DIR_OUT].type == IO_FUNC)
free(dev->io[DIR_OUT].queue);
if (dev->fd >= 0)
close(dev->fd);
free(dev);
return 0;
}
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