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/*
* OMAP3 ISP library - V4L2 buffers pool
*
* Copyright (C) 2010-2011 Ideas on board SPRL
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 General Public License for
* more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __V4L2_POOL_H
#define __V4L2_POOL_H
#include <linux/videodev2.h>
#include <stdbool.h>
/*
* struct v4l2_video_buffer - Video buffer information
* @index: Zero-based buffer index, limited to the number of buffers minus one
* @size: Size of the video memory, in bytes
* @bytesused: Number of bytes used by video data, smaller or equal to @size
* @timestamp: Time stamp at which the buffer has been captured
* @error: True if an error occured while capturing video data for the buffer
* @allocated: True if memory for the buffer has been allocated by the pool
* @mem: Video data memory
*/
struct v4l2_video_buffer
{
unsigned int index;
unsigned int size;
unsigned int bytesused;
struct timeval timestamp;
bool error;
bool allocated;
void *mem;
};
struct v4l2_buffers_pool
{
unsigned int nbufs;
struct v4l2_video_buffer *buffers;
};
/*
* v4l2_buffers_pool_new - Create a new buffers pool
* @nbufs: Number of buffers in the pool
*
* Allocate a new buffers pool with space for @nbufs buffers. Memory for the
* buffers is not allocated.
*/
struct v4l2_buffers_pool *v4l2_buffers_pool_new(unsigned int nbufs);
/*
* v4l2_buffers_pool_delete - Delete a buffers pool
* @pool: Buffers pool
*
* Delete a buffers pool and free buffers memory if it has been allocated by
* the pool.
*/
void v4l2_buffers_pool_delete(struct v4l2_buffers_pool *pool);
/*
* v4l2_buffers_pool_alloc - Allocate memory for buffers in a pool
* @pool: Buffers pool
* @size: Buffer size
* @align: Buffer memory alignment in bytes
*
* Allocate @size bytes of memory for each buffer aligned to a multiple of
* @align bytes. The alignment must be a power of 2.
*
* Return 0 on success or a negative error code on failure.
*/
int v4l2_buffers_pool_alloc(struct v4l2_buffers_pool *pool, size_t size,
size_t align);
#endif
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