From 52dfa38a8f4c1428d1556b54f4d3faa49d63e583 Mon Sep 17 00:00:00 2001
From: Maxim Devaev <mdevaev@gmail.com>
Date: Sun, 31 May 2026 18:28:53 +0300
Subject: [PATCH] janus: camera basics

---
 janus/src/config.c |  2 ++
 janus/src/config.h |  1 +
 janus/src/plugin.c | 37 ++++++++++++++-----------------------
 janus/src/sdp.c    |  7 ++++---
 janus/src/sdp.h    |  2 +-
 5 files changed, 22 insertions(+), 27 deletions(-)

diff --git a/janus/src/config.c b/janus/src/config.c
index 375e962..d4358e2 100644
--- a/janus/src/config.c
+++ b/janus/src/config.c
@@ -70,6 +70,7 @@ us_config_s *us_config_init(const char *config_dir_path) {
 		}
 	}
 	config->aplay_dev_name = _get_value(jcfg, "aplay", "device");
+	config->vplay_sink_name = _get_value(jcfg, "vplay", "sink");
 
 	goto ok;
 
@@ -87,6 +88,7 @@ void us_config_destroy(us_config_s *config) {
 	US_DELETE(config->acap_dev_name, free);
 	US_DELETE(config->tc358743_dev_path, free);
 	US_DELETE(config->aplay_dev_name, free);
+	US_DELETE(config->vplay_sink_name, free);
 	free(config);
 }
 
diff --git a/janus/src/config.h b/janus/src/config.h
index d193a60..d568fc1 100644
--- a/janus/src/config.h
+++ b/janus/src/config.h
@@ -34,6 +34,7 @@ typedef struct {
 	char	*tc358743_dev_path;
 
 	char	*aplay_dev_name;
+	char	*vplay_sink_name;
 } us_config_s;
 
 
diff --git a/janus/src/plugin.c b/janus/src/plugin.c
index d48a2f5..03bbd68 100644
--- a/janus/src/plugin.c
+++ b/janus/src/plugin.c
@@ -612,21 +612,20 @@ static struct janus_plugin_result *_plugin_handle_message(
 		uint video_orient = 0;
 		bool with_acap = false;
 		bool with_aplay = false;
+		bool with_vplay = false;
 		{
 			json_t *const params = json_object_get(msg, "params");
 			if (params != NULL) {
-				{
-					json_t *const obj = json_object_get(params, "audio");
-					if (obj != NULL && json_is_boolean(obj)) {
-						with_acap = (us_au_probe(_g_config->acap_dev_name) && json_boolean_value(obj));
+#				define READ_BOOL(x_target, x_key, x_cond) { \
+						json_t *const m_obj = json_object_get(params, x_key); \
+						if (m_obj != NULL && json_is_boolean(m_obj)) { \
+							x_target = (json_boolean_value(m_obj) && (x_cond)); \
+						} \
 					}
-				}
-				{
-					json_t *const obj = json_object_get(params, "mic");
-					if (obj != NULL && json_is_boolean(obj)) {
-						with_aplay = (us_au_probe(_g_config->aplay_dev_name) && json_boolean_value(obj));
-					}
-				}
+				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", (_g_config->vplay_sink_name != NULL));
+#				undef READ_BOOL
 				{
 					json_t *const obj = json_object_get(params, "orientation");
 					if (obj != NULL && json_is_integer(obj)) {
@@ -642,29 +641,21 @@ static struct janus_plugin_result *_plugin_handle_message(
 
 		{
 			_LOCK_ALL;
+			bool has_listeners = false;
+			bool has_speakers = false;
 			US_LIST_ITERATE(_g_clients, client, {
 				if (client->session == session) {
 					char *const sdp = us_sdp_create(
 						client->video_ssrc,
 						client->audio_ssrc,
 						with_acap,
-						with_aplay);
+						with_aplay,
+						with_vplay);
 					json_t *const offer_jsep = json_pack("{ssss}", "type", "offer", "sdp", sdp);
 					PUSH_STATUS("started", NULL, offer_jsep);
 					json_decref(offer_jsep);
 					free(sdp);
-					break;
-				}
-			});
-			_UNLOCK_ALL;
-		}
 
-		{
-			_LOCK_ALL;
-			bool has_listeners = false;
-			bool has_speakers = false;
-			US_LIST_ITERATE(_g_clients, client, {
-				if (client->session == session) {
 					atomic_store(&client->transmit_acap, with_acap);
 					atomic_store(&client->transmit_aplay, with_aplay);
 					atomic_store(&client->video_orient, video_orient);
diff --git a/janus/src/sdp.c b/janus/src/sdp.c
index 03a36b7..47f3f56 100644
--- a/janus/src/sdp.c
+++ b/janus/src/sdp.c
@@ -34,7 +34,7 @@
 #include "rtpa.h"
 
 
-char *us_sdp_create(u32 video_ssrc, u32 audio_ssrc, bool acap, bool aplay) {
+char *us_sdp_create(u32 video_ssrc, u32 audio_ssrc, bool acap, bool aplay, bool vplay) {
 	char *video_sdp;
 	{
 		// https://tools.ietf.org/html/rfc6184
@@ -56,9 +56,10 @@ char *us_sdp_create(u32 video_ssrc, u32 audio_ssrc, bool acap, bool aplay) {
 			"a=extmap:1/sendonly urn:3gpp:video-orientation" RN
 			"a=extmap:2/sendonly http://www.webrtc.org/experiments/rtp-hdrext/playout-delay" RN
 			"a=extmap:3/sendonly http://www.webrtc.org/experiments/rtp-hdrext/abs-capture-time" RN
-			"a=sendonly" RN,
+			"a=%s" RN,
 			pl, pl, pl, pl, pl, pl, pl,
-			video_ssrc);
+			video_ssrc,
+			(vplay ? "sendrecv" : "sendonly"));
 	}
 
 	char *audio_sdp;
diff --git a/janus/src/sdp.h b/janus/src/sdp.h
index 6f475f7..32dd477 100644
--- a/janus/src/sdp.h
+++ b/janus/src/sdp.h
@@ -25,4 +25,4 @@
 #include "uslibs/types.h"
 
 
-char *us_sdp_create(u32 video_ssrc, u32 audio_ssrc, bool acap, bool aplay);
+char *us_sdp_create(u32 video_ssrc, u32 audio_ssrc, bool acap, bool aplay, bool vplay);