From 35fa72ba73cf1913cf6314092997bcfae3e2a4de Mon Sep 17 00:00:00 2001
From: Maxim Devaev <mdevaev@gmail.com>
Date: Fri, 17 Jul 2026 19:40:39 +0300
Subject: [PATCH] janus: webcam: check the device state

---
 janus/src/config.c |  2 ++
 janus/src/config.h |  1 +
 janus/src/plugin.c | 15 +++++++++++++--
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/janus/src/config.c b/janus/src/config.c
index 9fea816..75cdd20 100644
--- a/janus/src/config.c
+++ b/janus/src/config.c
@@ -77,6 +77,7 @@ us_config_s *us_config_init(const char *config_dir_path) {
 
 	config->vplay_sink_name = _get_value(jcfg, "vplay", "sink");
 	config->vplay_sink_mode = _get_uint(jcfg, "vplay", "sink_mode", 0660, 8);
+	config->vplay_dev_path = _get_value(jcfg, "vplay", "device");
 
 	goto ok;
 
@@ -95,6 +96,7 @@ void us_config_destroy(us_config_s *config) {
 	US_DELETE(config->tc358743_dev_path, free);
 	US_DELETE(config->aplay_dev_name, free);
 	US_DELETE(config->vplay_sink_name, free);
+	US_DELETE(config->vplay_dev_path, free);
 	free(config);
 }
 
diff --git a/janus/src/config.h b/janus/src/config.h
index 59a116d..2682f4a 100644
--- a/janus/src/config.h
+++ b/janus/src/config.h
@@ -37,6 +37,7 @@ typedef struct {
 
 	char	*vplay_sink_name;
 	uint	vplay_sink_mode;
+	char	*vplay_dev_path;
 } us_config_s;
 
 
diff --git a/janus/src/plugin.c b/janus/src/plugin.c
index 56e7898..9169033 100644
--- a/janus/src/plugin.c
+++ b/janus/src/plugin.c
@@ -386,6 +386,7 @@ static void *_aplay_thread(void *arg) {
 	return NULL;
 }
 
+static bool _is_camera_enabled(void);
 static void _camera_set_active(uint width, uint height, uint fps);
 static void _camera_set_inactive();
 
@@ -615,6 +616,16 @@ static void _push_camera_event(us_janus_client_s *client, bool requested) {
 	json_decref(event);
 }
 
+static bool _is_camera_enabled(void) {
+	bool enabled = us_str_is_ok(_g_config->vplay_sink_name);
+	if (enabled && us_str_is_ok(_g_config->vplay_dev_path)) {
+		if (access(_g_config->vplay_dev_path, F_OK) != 0) {
+			enabled = false;
+		}
+	}
+	return enabled;
+}
+
 static void _camera_set_active(uint width, uint height, uint fps) {
 	_LOCK_VPLAY;
 	US_A(!_g_camera.active);
@@ -787,7 +798,7 @@ static struct janus_plugin_result *_plugin_handle_message(
 					}
 				READ_BOOL(with_acap, "audio", us_au_probe(_g_config->acap_dev_name));
 				READ_BOOL(with_aplay, "mic", us_au_probe(_g_config->aplay_dev_name));
-				READ_BOOL(with_vplay, "camera", us_str_is_ok(_g_config->vplay_sink_name));
+				READ_BOOL(with_vplay, "camera", _is_camera_enabled());
 #				undef READ_BOOL
 				{
 					json_t *const obj = json_object_get(params, "orientation");
@@ -858,7 +869,7 @@ static struct janus_plugin_result *_plugin_handle_message(
 			"audio", us_au_probe(_g_config->acap_dev_name),
 			"mic", us_au_probe(_g_config->aplay_dev_name),
 			"camera",
-				"enabled", us_str_is_ok(_g_config->vplay_sink_name),
+				"enabled", _is_camera_enabled(),
 				"request", camera_req,
 			"ice",
 				"url", (ice_url != NULL ? ice_url : _g_default_ice_url)