libpisp: introduce recipe

It is a dependency of libcamera, when it is built with rpi support.

Signed-off-by: Gyorgy Sarvari <[email protected]>

Author: OldManYellsAtCloud

dynamic-layers/multimedia-layer/recipes-multimedia/libpisp/files/0001-ignore-lockf-return-value.patch

@@ -0,0 +1,34 @@
+From 230d9c127d45af11739214e78488a93255b832bb Mon Sep 17 00:00:00 2001
+From: Gyorgy Sarvari <[email protected]>
+Date: Tue, 16 Sep 2025 16:28:34 +0200
+Subject: [PATCH] ignore lockf() return value
+
+gcc15 returns an error otherwise:
+
+| ../sources/libpisp-1.2.1/src/helpers/media_device.cpp: In member function 'std::map<std::__cxx11::basic_string<char>, libpisp::helpers::DeviceFd>::iterator libpisp::helpers::MediaDevice::unlock(const std::string&)':
+| ../sources/libpisp-1.2.1/src/helpers/media_device.cpp:251:14: error: ignoring return value of 'int lockf(int, int, __off64_t)' declared with attribute 'warn_unused_result' [-Werror=unused-result]
+|   251 |         lockf(it->second.Get(), F_ULOCK, 0);
+|       |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Upstream-Status: Submitted [https://github.com/raspberrypi/libpisp/pull/53]
+
+Signed-off-by: Gyorgy Sarvari <[email protected]>
+---
+ src/helpers/media_device.cpp | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/src/helpers/media_device.cpp b/src/helpers/media_device.cpp
+index 0dd64d6..121ce79 100644
+--- a/src/helpers/media_device.cpp
++++ b/src/helpers/media_device.cpp
+@@ -248,6 +248,6 @@ std::map<std::string, DeviceFd>::iterator MediaDevice::unlock(const std::string
+ 	if (it == lock_map_.end())
+ 		return lock_map_.end();
+ 
+-	lockf(it->second.Get(), F_ULOCK, 0);
++	std::ignore = lockf(it->second.Get(), F_ULOCK, 0);
+ 	return lock_map_.erase(it);
+ }
+-- 
+2.51.0
+

dynamic-layers/multimedia-layer/recipes-multimedia/libpisp/libpisp_1.2.1.bb

@@ -0,0 +1,16 @@
+DESCRIPTION = "A helper library to generate run-time configuration for the Raspberry Pi \
+ISP (PiSP), consisting of the Frontend and Backend hardware components."
+HOMEPAGE = "https://github.com/raspberrypi/libpisp"
+LICENSE = "BSD-2-Clause & GPL-2.0-only & GPL-2.0-or-later"
+LIC_FILES_CHKSUM = "file://LICENSE;md5=3417a46e992fdf62e5759fba9baef7a7 \
+                    file://LICENSES/GPL-2.0-only.txt;md5=b234ee4d69f5fce4486a80fdaf4a4263 \
+                    file://LICENSES/GPL-2.0-or-later.txt;md5=fed54355545ffd980b814dab4a3b312c"
+
+SRC_URI = "git://github.com/raspberrypi/libpisp.git;protocol=https;branch=main \
+           file://0001-ignore-lockf-return-value.patch"
+
+SRCREV = "981977ff21f32c8a97d2a0ecbdff3e39d42ccce3"
+
+DEPENDS = "nlohmann-json"
+
+inherit meson pkgconfig