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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* V4L2 video source
*
* Copyright (C) 2018 Laurent Pinchart
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include "events.h"
#include "tools.h"
#include "v4l2.h"
#include "v4l2-source.h"
#include "video-buffers.h"
struct v4l2_source {
struct video_source src;
struct v4l2_device *vdev;
};
#define to_v4l2_source(s) container_of(s, struct v4l2_source, src)
static void v4l2_source_video_process(void *d)
{
struct v4l2_source *src = d;
struct video_buffer buf;
int ret;
ret = v4l2_dequeue_buffer(src->vdev, &buf);
if (ret < 0)
return;
src->src.handler(src->src.handler_data, &src->src, &buf);
}
static void v4l2_source_destroy(struct video_source *s)
{
struct v4l2_source *src = to_v4l2_source(s);
v4l2_close(src->vdev);
free(src);
}
static int v4l2_source_set_format(struct video_source *s,
struct v4l2_pix_format *fmt)
{
struct v4l2_source *src = to_v4l2_source(s);
return v4l2_set_format(src->vdev, fmt);
}
static int v4l2_source_alloc_buffers(struct video_source *s, unsigned int nbufs)
{
struct v4l2_source *src = to_v4l2_source(s);
return v4l2_alloc_buffers(src->vdev, V4L2_MEMORY_MMAP, nbufs);
}
static int v4l2_source_export_buffers(struct video_source *s,
struct video_buffer_set **bufs)
{
struct v4l2_source *src = to_v4l2_source(s);
struct video_buffer_set *buffers;
unsigned int i;
int ret;
ret = v4l2_export_buffers(src->vdev);
if (ret < 0)
return ret;
buffers = video_buffer_set_new(src->vdev->buffers.nbufs);
if (!buffers)
return -ENOMEM;
for (i = 0; i < src->vdev->buffers.nbufs; ++i) {
struct video_buffer *buffer = &src->vdev->buffers.buffers[i];
buffers->buffers[i].size = buffer->size;
buffers->buffers[i].dmabuf = buffer->dmabuf;
}
*bufs = buffers;
return 0;
}
static int v4l2_source_free_buffers(struct video_source *s)
{
struct v4l2_source *src = to_v4l2_source(s);
return v4l2_free_buffers(src->vdev);
}
static int v4l2_source_stream_on(struct video_source *s)
{
struct v4l2_source *src = to_v4l2_source(s);
unsigned int i;
int ret;
/* Queue all buffers. */
for (i = 0; i < src->vdev->buffers.nbufs; ++i) {
struct video_buffer buf = {
.index = i,
.size = src->vdev->buffers.buffers[i].size,
.dmabuf = src->vdev->buffers.buffers[i].dmabuf,
};
ret = v4l2_queue_buffer(src->vdev, &buf);
if (ret < 0)
return ret;
}
ret = v4l2_stream_on(src->vdev);
if (ret < 0)
return ret;
events_watch_fd(src->src.events, src->vdev->fd, EVENT_READ,
v4l2_source_video_process, src);
return 0;
}
static int v4l2_source_stream_off(struct video_source *s)
{
struct v4l2_source *src = to_v4l2_source(s);
events_unwatch_fd(src->src.events, src->vdev->fd, EVENT_READ);
return v4l2_stream_off(src->vdev);
}
static int v4l2_source_queue_buffer(struct video_source *s,
struct video_buffer *buf)
{
struct v4l2_source *src = to_v4l2_source(s);
return v4l2_queue_buffer(src->vdev, buf);
}
static const struct video_source_ops v4l2_source_ops = {
.destroy = v4l2_source_destroy,
.set_format = v4l2_source_set_format,
.alloc_buffers = v4l2_source_alloc_buffers,
.export_buffers = v4l2_source_export_buffers,
.free_buffers = v4l2_source_free_buffers,
.stream_on = v4l2_source_stream_on,
.stream_off = v4l2_source_stream_off,
.queue_buffer = v4l2_source_queue_buffer,
};
struct video_source *v4l2_video_source_create(const char *devname)
{
struct v4l2_source *src;
src = malloc(sizeof *src);
if (!src)
return NULL;
memset(src, 0, sizeof *src);
src->src.ops = &v4l2_source_ops;
src->vdev = v4l2_open(devname);
if (!src->vdev) {
free(src);
return NULL;
}
return &src->src;
}
void v4l2_video_source_init(struct video_source *s, struct events *events)
{
struct v4l2_source *src = to_v4l2_source(s);
src->src.events = events;
}
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