From: Volker Rümelin <vr_qemu@t-online.de>
Date: Thu, 15 May 2025 05:44:25 +0000 (+0200)
Subject: audio: fix size calculation in AUD_get_buffer_size_out()
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ccb4fec0e5f233cb61a83b3af59ae11716ea06c0;p=thirdparty%2Fqemu.git

audio: fix size calculation in AUD_get_buffer_size_out()

The buffer size calculated by AUD_get_buffer_size_out() is often
incorrect. sw->hw->samples * sw->hw->info.bytes_per_frame is the
size of the mixing engine buffer in audio frames multiplied by
the size of one frame of the audio backend. Due to resampling or
format conversion, the size of the frontend buffer can differ
significantly.

Return the correct buffer size when the mixing engine is used.

Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Volker Rümelin <vr_qemu@t-online.de>
Message-Id: <20250515054429.7385-3-vr_qemu@t-online.de>
---

diff --git a/audio/audio.c b/audio/audio.c
index 70ef22b1a4..3f5baf0cc6 100644
--- a/audio/audio.c
+++ b/audio/audio.c
@@ -909,6 +909,10 @@ int AUD_get_buffer_size_out(SWVoiceOut *sw)
         return 0;
     }
 
+    if (audio_get_pdo_out(sw->s->dev)->mixing_engine) {
+        return sw->resample_buf.size * sw->info.bytes_per_frame;
+    }
+
     return sw->hw->samples * sw->hw->info.bytes_per_frame;
 }