From 20f17c73de1e6859464193e4d6030a4c72155619 Mon Sep 17 00:00:00 2001
From: Carlos Rafael Giani <crg7475@mailbox.org>
Date: Wed, 24 Jun 2026 10:35:48 +0200
Subject: [PATCH] module-rtp: Correctly scale device_delay in constant latency
 mode

---
 src/modules/module-rtp/audio.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/modules/module-rtp/audio.c b/src/modules/module-rtp/audio.c
index 5021b223b..20f58fde6 100644
--- a/src/modules/module-rtp/audio.c
+++ b/src/modules/module-rtp/audio.c
@@ -217,6 +217,13 @@ static void rtp_audio_process_playback(void *data)
 
 		avail = spa_ringbuffer_get_read_index(&impl->ring, &timestamp);
 
+		if (impl->io_position) {
+			uint32_t clock_rate = impl->io_position->clock.rate.denom;
+			/* Device delay is reported in clock rate units. If this does not
+			 * match the RTP rate, the device delay must be transformed first. */
+			device_delay = scale_u64(device_delay, impl->rate, clock_rate);
+		}
+
 		/* Reduce target buffer by the delay amount to start playback sooner.
 		 * This compensates for the delay to the device. */
 		if (SPA_UNLIKELY(impl->target_buffer < device_delay)) {