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v4l2: support setting controls

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Dmitry Sharshakov 2023-01-03 14:39:23 +03:00 • committed by Wim Taymans
parent 08107f1a02
commit bb23fd787e
1 changed files with 76 additions and 0 deletions
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76
pipewire-v4l2/src/pipewire-v4l2.c
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@ -2208,6 +2208,79 @@ static int vidioc_g_ctrl(struct file *file, struct v4l2_control *arg)
return 0;
}
static int vidioc_s_ctrl(struct file *file, struct v4l2_control *arg)
{
struct param *p;
bool found = false;
pw_log_info("VIDIOC_S_CTRL: 0x%08" PRIx32 " 0x%08" PRIx32, arg->id, arg->value);
if (file->node == NULL)
return -EIO;
pw_thread_loop_lock(file->loop);
spa_list_for_each(p, &file->node->param_list, link) {
uint32_t prop_id, ctrl_id, n_vals, choice = SPA_ID_INVALID;
const char *prop_description;
const struct spa_pod *type, *pod;
if (p->id != SPA_PARAM_PropInfo || p->param == NULL)
continue;
if (spa_pod_parse_object(p->param,
SPA_TYPE_OBJECT_PropInfo, NULL,
SPA_PROP_INFO_id, SPA_POD_Id(&prop_id),
SPA_PROP_INFO_description, SPA_POD_String(&prop_description)) < 0)
continue;
if ((ctrl_id = prop_id_to_control(prop_id)) == SPA_ID_INVALID)
continue;
if (spa_pod_parse_object(p->param,
SPA_TYPE_OBJECT_PropInfo, NULL,
SPA_PROP_INFO_type, SPA_POD_PodChoice(&type)) < 0)
continue;
if (ctrl_id == arg->id) {
char buf[1024];
struct spa_pod_builder b = SPA_POD_BUILDER_INIT(buf, sizeof(buf));
struct spa_pod_frame f[1];
struct spa_pod *param;
pod = spa_pod_get_values(type, &n_vals, &choice);
spa_pod_builder_push_object(&b, &f[0],
SPA_TYPE_OBJECT_Props, SPA_PARAM_Props);
if (spa_pod_is_int(pod)) {
spa_pod_builder_add(&b, prop_id, SPA_POD_Int(arg->value), 0);
} else if (spa_pod_is_bool(pod)) {
spa_pod_builder_add(&b, prop_id, SPA_POD_Bool(arg->value), 0);
} else {
// TODO: float and other formats
pw_log_info("unknown type");
break;
}
param = spa_pod_builder_pop(&b, &f[0]);
pw_node_set_param(file->node->proxy, SPA_PARAM_Props, 0, param);
found = true;
pw_log_info("ctrl 0x%08" PRIx32 " set ok", arg->id);
break;
}
}
pw_thread_loop_unlock(file->loop);
if (!found) {
pw_log_info("not found ctrl 0x%08" PRIx32, arg->id);
return -EINVAL;
}
return 0;
}
static int v4l2_ioctl(int fd, unsigned long int request, void *arg)
{
int res;
@ -2288,6 +2361,9 @@ static int v4l2_ioctl(int fd, unsigned long int request, void *arg)
case VIDIOC_G_CTRL:
res = vidioc_g_ctrl(file, (struct v4l2_control *)arg);
break;
case VIDIOC_S_CTRL:
res = vidioc_s_ctrl(file, (struct v4l2_control *)arg);
break;
default:
res = -ENOTTY;
break;