hardcode ipa paths into libcamera (#6)

camera.cpp

@@ -145,11 +145,6 @@ bool camera_create(const parameters_t *params, camera_frame_cb frame_cb, camera_
     // We make sure to set the environment variable before libcamera init
     setenv("LIBCAMERA_RPI_TUNING_FILE", params->tuning_file, 1);
 
-    // TODO: move into embedded libcamera
-    setenv("LIBCAMERA_IPA_CONFIG_PATH", "./ipa_conf", 1);
-    setenv("LIBCAMERA_IPA_MODULE_PATH", "./ipa_module", 1);
-    setenv("LIBCAMERA_IPA_PROXY_PATH", "/dev/null", 1);
-
     camp->camera_manager = std::make_unique<CameraManager>();
     int ret = camp->camera_manager->start();
     if (ret != 0) {

libcamera.patch

@@ -11,6 +11,25 @@ index 58bb9893..41fc661f 100644
      default_options : [
          'werror=true',
          'warning_level=2',
+diff --git a/src/ipa/meson.build b/src/ipa/meson.build
+index 0ad4631d..101b41ad 100644
+--- a/src/ipa/meson.build
++++ b/src/ipa/meson.build
+@@ -8,12 +8,9 @@ ipa_install_dir = libcamera_libdir
+ ipa_data_dir = libcamera_datadir / 'ipa'
+ ipa_sysconf_dir = libcamera_sysconfdir / 'ipa'
+
+-config_h.set('IPA_CONFIG_DIR',
+-             '"' + get_option('prefix') / ipa_sysconf_dir +
+-             ':' + get_option('prefix') / ipa_data_dir + '"')
++config_h.set('IPA_CONFIG_DIR', '"./ipa_conf"')
+
+-config_h.set('IPA_MODULE_DIR',
+-             '"' + get_option('prefix') / ipa_install_dir + '"')
++config_h.set('IPA_MODULE_DIR', '"./ipa_module"')
+
+ summary({
+          'IPA_CONFIG_DIR' : config_h.get('IPA_CONFIG_DIR'),
 diff --git a/src/libcamera/meson.build b/src/libcamera/meson.build
 index 89504cee..20c588cb 100644
 --- a/src/libcamera/meson.build
@@ -24,3 +43,17 @@ index 89504cee..20c588cb 100644
  libthreads = dependency('threads')
 
  subdir('base')
+diff --git a/src/libcamera/proxy/worker/meson.build b/src/libcamera/proxy/worker/meson.build
+index aa4d9cd7..31b994a9 100644
+--- a/src/libcamera/proxy/worker/meson.build
++++ b/src/libcamera/proxy/worker/meson.build
+@@ -24,8 +24,7 @@ foreach mojom : ipa_mojoms
+                        dependencies : libcamera_private)
+ endforeach
+
+-config_h.set('IPA_PROXY_DIR',
+-             '"' + get_option('prefix') / proxy_install_dir + '"')
++config_h.set('IPA_PROXY_DIR', '"/dev/null"')
+
+ summary({
+          'IPA_PROXY_DIR' : config_h.get('IPA_PROXY_DIR'),