py: Implement PixelFormat class

Implement PixelFormat bindings properly with a PixelFormat class. Change
the bindings to use the new class instead of a string.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/py/cam/cam.py

@@ -164,7 +164,7 @@ def configure(ctx):
             stream_config.size = (stream_opts['width'], stream_opts['height'])
 
         if 'pixelformat' in stream_opts:
-            stream_config.pixel_format = stream_opts['pixelformat']
+            stream_config.pixel_format = libcam.PixelFormat(stream_opts['pixelformat'])
 
     stat = camconfig.validate()
 

src/py/cam/cam_kms.py

@@ -5,14 +5,6 @@ import pykms
 import selectors
 import sys
 
-FMT_MAP = {
-    'RGB888': pykms.PixelFormat.RGB888,
-    'YUYV': pykms.PixelFormat.YUYV,
-    'ARGB8888': pykms.PixelFormat.ARGB8888,
-    'XRGB8888': pykms.PixelFormat.XRGB8888,
-    'NV12': pykms.PixelFormat.NV12,
-}
-
 
 class KMSRenderer:
     def __init__(self, state):
@@ -120,7 +112,7 @@ class KMSRenderer:
 
                 cfg = stream.configuration
                 fmt = cfg.pixel_format
-                fmt = FMT_MAP[fmt]
+                fmt = pykms.PixelFormat(fmt.fourcc)
 
                 plane = self.resman.reserve_generic_plane(self.crtc, fmt)
                 assert(plane is not None)

src/py/cam/cam_qt.py

@@ -87,6 +87,8 @@ def to_rgb(fmt, size, data):
     w = size[0]
     h = size[1]
 
+    fmt = str(fmt)
+
     if fmt == 'YUYV':
         # YUV422
         yuyv = data.reshape((h, w // 2 * 4))
@@ -293,7 +295,7 @@ class MainWindow(QtWidgets.QWidget):
             w, h = cfg.size
             pitch = cfg.stride
 
-            if cfg.pixel_format == 'MJPEG':
+            if str(cfg.pixel_format) == 'MJPEG':
                 img = Image.open(BytesIO(mfb.planes[0]))
                 qim = ImageQt(img).copy()
                 pix = QtGui.QPixmap.fromImage(qim)

src/py/cam/cam_qtgl.py

@@ -30,14 +30,6 @@ from OpenGL.GL import shaders
 
 from gl_helpers import *
 
-# libcamera format string -> DRM fourcc
-FMT_MAP = {
-    'RGB888': 'RG24',
-    'XRGB8888': 'XR24',
-    'ARGB8888': 'AR24',
-    'YUYV': 'YUYV',
-}
-
 
 class EglState:
     def __init__(self):
@@ -204,12 +196,6 @@ class MainWindow(QtWidgets.QWidget):
             self.current[ctx['idx']] = []
 
             for stream in ctx['streams']:
-                fmt = stream.configuration.pixel_format
-                size = stream.configuration.size
-
-                if fmt not in FMT_MAP:
-                    raise Exception('Unsupported pixel format: ' + str(fmt))
-
                 self.textures[stream] = None
 
         num_tiles = len(self.textures)
@@ -281,8 +267,7 @@ class MainWindow(QtWidgets.QWidget):
 
     def create_texture(self, stream, fb):
         cfg = stream.configuration
-        fmt = cfg.pixel_format
-        fmt = str_to_fourcc(FMT_MAP[fmt])
+        fmt = cfg.pixel_format.fourcc
         w, h = cfg.size
 
         attribs = [

src/py/cam/gl_helpers.py

@@ -30,14 +30,6 @@ def getglEGLImageTargetTexture2DOES():
 
 glEGLImageTargetTexture2DOES = getglEGLImageTargetTexture2DOES()
 
-# \todo This can be dropped when we have proper PixelFormat bindings
-def str_to_fourcc(str):
-    assert(len(str) == 4)
-    fourcc = 0
-    for i, v in enumerate([ord(c) for c in str]):
-        fourcc |= v << (i * 8)
-    return fourcc
-
 
 def get_gl_extensions():
     n = GLint()