pipeline: ipa: raspberrypi: Refactor and move the Raspberry Pi code

Split the Raspberry Pi pipeline handler and IPA source code into common
and VC4/BCM2835 specific file structures.

For the pipeline handler, the common code files now live in
src/libcamera/pipeline/rpi/common/
and the VC4-specific files in src/libcamera/pipeline/rpi/vc4/.

For the IPA, the common code files now live in
src/ipa/rpi/{cam_helper,controller}/
and the vc4 specific files in src/ipa/rpi/vc4/. With this change, the
camera tuning files are now installed under share/libcamera/ipa/rpi/vc4/.

To build the pipeline and IPA, the meson configuration options have now
changed from "raspberrypi" to "rpi/vc4":

meson setup build -Dipas=rpi/vc4 -Dpipelines=rpi/vc4

Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/libcamera/pipeline/rpi/common/meson.build

@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: CC0-1.0
+
+libcamera_sources += files([
+    'delayed_controls.cpp',
+    'rpi_stream.cpp',
+])

src/libcamera/pipeline/rpi/meson.build

@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: CC0-1.0
+
+subdir('common')
+
+foreach pipeline : pipelines
+    pipeline = pipeline.split('/')
+    if pipeline.length() < 2 or pipeline[0] != 'rpi'
+        continue
+    endif
+
+    subdir(pipeline[1])
+endforeach

src/libcamera/pipeline/rpi/vc4/data/meson.build

@@ -5,4 +5,4 @@ conf_files = files([
 ])
 
 install_data(conf_files,
-             install_dir : pipeline_data_dir / 'raspberrypi')
+             install_dir : pipeline_data_dir / 'rpi' / 'vc4')

src/libcamera/pipeline/rpi/vc4/meson.build

@@ -1,10 +1,8 @@
 # SPDX-License-Identifier: CC0-1.0
 
 libcamera_sources += files([
-    'delayed_controls.cpp',
     'dma_heaps.cpp',
     'raspberrypi.cpp',
-    'rpi_stream.cpp',
 ])
 
 subdir('data')

src/libcamera/pipeline/rpi/vc4/raspberrypi.cpp

@@ -2,7 +2,7 @@
 /*
  * Copyright (C) 2019-2021, Raspberry Pi Ltd
  *
- * raspberrypi.cpp - Pipeline handler for Raspberry Pi devices
+ * raspberrypi.cpp - Pipeline handler for VC4-based Raspberry Pi devices
  */
 #include <algorithm>
 #include <assert.h>
@@ -43,9 +43,9 @@
 #include "libcamera/internal/v4l2_videodevice.h"
 #include "libcamera/internal/yaml_parser.h"
 
-#include "delayed_controls.h"
+#include "../common/delayed_controls.h"
+#include "../common/rpi_stream.h"
 #include "dma_heaps.h"
-#include "rpi_stream.h"
 
 using namespace std::chrono_literals;