From 93c2e6ec320016a3b3a3764db44fc7434d37d031 Mon Sep 17 00:00:00 2001
From: Marvin Scholz <epirat07@gmail.com>
Date: Thu, 5 Feb 2026 16:33:37 +0100
Subject: [PATCH] buildsystem: detect new libspatialaudio

We can use the presence of the version header to detect libspatialaudio
0.4.0 or higher. (For more granular checks in the future, the defines
from the version header can be checked)
---
 configure.ac                     | 9 +++++++++
 modules/audio_filter/meson.build | 9 +++++++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/configure.ac b/configure.ac
index 69cd6cbe29..ab432d34cf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2966,6 +2966,15 @@ dnl  Ambisonic channel mixer and binauralizer plugin
 dnl
 PKG_ENABLE_MODULES_VLC([SPATIALAUDIO], [], [spatialaudio], [Ambisonic channel mixer and binauralizer], [auto])
 
+AS_IF([test -n ${SPATIALAUDIO_CFLAGS+set}], [
+    VLC_SAVE_FLAGS
+    AX_APPEND_FLAG([$SPATIALAUDIO_CFLAGS], [CFLAGS])
+    AC_CHECK_HEADER([spatialaudio/SpatialaudioVersion.h], [
+        AX_APPEND_FLAG([-DHAVE_SPATIALAUDIOVERSION_H=1], [SPATIALAUDIO_CFLAGS])
+    ])
+    VLC_RESTORE_FLAGS
+])
+
 dnl
 dnl  theora decoder plugin
 dnl
diff --git a/modules/audio_filter/meson.build b/modules/audio_filter/meson.build
index d62ef929ee..521ee6c2a7 100644
--- a/modules/audio_filter/meson.build
+++ b/modules/audio_filter/meson.build
@@ -157,10 +157,16 @@ vlc_modules += {
 # Spatial audio (ambisonics/binaural) mixer
 spatial_dep = dependency('spatialaudio', required: get_option('spatialaudio'))
 if spatial_dep.found()
+    spatial_extra_cflags = []
+    if (spatial_dep.version().version_compare('>= 0.4.0'))
+        spatial_extra_cflags += ['-DHAVE_SPATIALAUDIOVERSION_H=1']
+    endif
+
     vlc_modules += {
         'name' : 'spatialaudio',
         'sources' : files('channel_mixer/spatialaudio.cpp'),
-        'dependencies' : [spatial_dep]
+        'dependencies' : [spatial_dep],
+        'c_args' : spatial_extra_cflags
     }
 endif
 
@@ -242,4 +248,3 @@ if rnnoise_dep.found()
 	'dependencies' : [m_lib, rnnoise_dep]
     }
 endif
-