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v4l2: implement setting controls

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This commit is contained in:
Wim Taymans 2022-10-31 11:33:45 +01:00
parent c5f7d3a728
commit 71d58e6445
2 changed files with 99 additions and 22 deletions
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21
spa/plugins/v4l2/v4l2-source.c
View file

@ -266,14 +266,29 @@ static int impl_node_set_param(void *object,
case SPA_PARAM_Props:
{
struct props *p = &this->props;
struct spa_pod_object *obj = (struct spa_pod_object *) param;
struct spa_pod_prop *prop;
int res = 0;
if (param == NULL) {
reset_props(p);
return 0;
}
spa_pod_parse_object(param,
SPA_TYPE_OBJECT_Props, NULL,
SPA_PROP_device, SPA_POD_OPT_Stringn(p->device, sizeof(p->device)));
SPA_POD_OBJECT_FOREACH(obj, prop) {
switch (prop->key) {
case SPA_PROP_device:
strncpy(p->device,
(char *)SPA_POD_CONTENTS(struct spa_pod_string, &prop->value),
sizeof(p->device)-1);
break;
default:
res = spa_v4l2_set_control(this, prop->key, prop);
break;
}
if (res < 0)
return res;
}
break;
}
default:

100
spa/plugins/v4l2/v4l2-utils.c
View file

@ -30,6 +30,8 @@
#include <sys/mman.h>
#include <poll.h>
#include <spa/utils/result.h>
static int xioctl(int fd, int request, void *arg)
{
int err;
@ -1040,28 +1042,38 @@ static int query_ext_ctrl_ioctl(struct port *port, struct v4l2_query_ext_ctrl *q
return res;
}
static struct {
uint32_t v4l2_id;
uint32_t spa_id;
} control_map[] = {
{ V4L2_CID_BRIGHTNESS, SPA_PROP_brightness },
{ V4L2_CID_CONTRAST, SPA_PROP_contrast },
{ V4L2_CID_SATURATION, SPA_PROP_saturation },
{ V4L2_CID_HUE, SPA_PROP_hue },
{ V4L2_CID_GAMMA, SPA_PROP_gamma },
{ V4L2_CID_EXPOSURE, SPA_PROP_exposure },
{ V4L2_CID_GAIN, SPA_PROP_gain },
{ V4L2_CID_SHARPNESS, SPA_PROP_sharpness },
};
static uint32_t control_to_prop_id(struct impl *impl, uint32_t control_id)
{
switch (control_id) {
case V4L2_CID_BRIGHTNESS:
return SPA_PROP_brightness;
case V4L2_CID_CONTRAST:
return SPA_PROP_contrast;
case V4L2_CID_SATURATION:
return SPA_PROP_saturation;
case V4L2_CID_HUE:
return SPA_PROP_hue;
case V4L2_CID_GAMMA:
return SPA_PROP_gamma;
case V4L2_CID_EXPOSURE:
return SPA_PROP_exposure;
case V4L2_CID_GAIN:
return SPA_PROP_gain;
case V4L2_CID_SHARPNESS:
return SPA_PROP_sharpness;
default:
return SPA_PROP_START_CUSTOM + control_id;
SPA_FOR_EACH_ELEMENT_VAR(control_map, c) {
if (c->v4l2_id == control_id)
return c->spa_id;
}
return SPA_PROP_START_CUSTOM + control_id;
}
static uint32_t prop_id_to_control(struct impl *impl, uint32_t prop_id)
{
SPA_FOR_EACH_ELEMENT_VAR(control_map, c) {
if (c->spa_id == prop_id)
return c->v4l2_id;
}
if (prop_id >= SPA_PROP_START_CUSTOM)
return prop_id - SPA_PROP_START_CUSTOM;
return SPA_ID_INVALID;
}
static int
@ -1225,6 +1237,56 @@ spa_v4l2_enum_controls(struct impl *this, int seq,
return res;
}
static int
spa_v4l2_set_control(struct impl *this, uint32_t id,
const struct spa_pod_prop *prop)
{
struct port *port = &this->out_ports[0];
struct spa_v4l2_device *dev = &port->dev;
struct v4l2_control control;
int res;
spa_zero(control);
control.id = prop_id_to_control(this, prop->key);
if (control.id == SPA_ID_INVALID)
return -ENOENT;
if ((res = spa_v4l2_open(dev, this->props.device)) < 0)
return res;
switch (SPA_POD_TYPE(&prop->value)) {
case SPA_TYPE_Bool:
{
bool val;
if ((res = spa_pod_get_bool(&prop->value, &val)) < 0)
goto done;
control.value = val;
break;
}
case SPA_TYPE_Int:
{
int32_t val;
if ((res = spa_pod_get_int(&prop->value, &val)) < 0)
goto done;
control.value = val;
break;
}
default:
res = -EINVAL;
goto done;
}
if (xioctl(dev->fd, VIDIOC_S_CTRL, &control) < 0) {
res = -errno;
goto done;
}
res = 0;
done:
spa_v4l2_close(dev);
return res;
}
static int mmap_read(struct impl *this)
{
struct port *port = &this->out_ports[0];