Removed noise stream from MockCamera

openflexure_microscope/camera/mock.py

@@ -8,7 +8,7 @@ from __future__ import division
 import io
 import time
 import numpy as np
-from PIL import Image
+from PIL import Image, ImageFont, ImageDraw
 
 import logging
 
@@ -20,16 +20,12 @@ from .base import BaseCamera, CaptureObject
 
 # MAIN CLASS
 class MockStreamer(BaseCamera):
-
     def __init__(self):
         # Run BaseCamera init
         BaseCamera.__init__(self)
 
         # Store state of PiCameraStreamer
-        self.state.update({
-            'stream_active': False,
-            'record_active': False
-        })
+        self.state.update({"stream_active": False, "record_active": False})
 
         # Update config properties
         self.image_resolution = (1312, 976)
@@ -41,9 +37,25 @@ class MockStreamer(BaseCamera):
         # Create an empty stream
         self.stream = io.BytesIO()
 
+        # Generate an initial dummy image
+        self.generate_new_dummy_image()
+
         # Start streaming
         self.start_worker()
 
+    def generate_new_dummy_image(self):
+        # Create a dummy image to serve in the stream
+        image = Image.new(
+            "RGB",
+            (self.stream_resolution[0], self.stream_resolution[1]),
+            color=(0, 0, 0),
+        )
+
+        draw = ImageDraw.Draw(image)
+        draw.text((20, 70), "Camera disconnected")
+
+        image.save(self.stream, format="JPEG")
+
     def initialisation(self):
         """Run any initialisation code when the frame iterator starts."""
         pass
@@ -60,10 +72,10 @@ class MockStreamer(BaseCamera):
         """
 
         conf_dict = {
-            'stream_resolution': self.stream_resolution,
-            'image_resolution': self.image_resolution,
-            'numpy_resolution': self.numpy_resolution,
-            'jpeg_quality': self.jpeg_quality
+            "stream_resolution": self.stream_resolution,
+            "image_resolution": self.image_resolution,
+            "numpy_resolution": self.numpy_resolution,
+            "jpeg_quality": self.jpeg_quality,
         }
 
         return conf_dict
@@ -78,8 +90,6 @@ class MockStreamer(BaseCamera):
         Args:
             config (dict): Dictionary of config parameters.
         """
-        # TODO: Include timing and batching logic when applying PiCamera settings
-
         paused_stream = False
         logging.debug("PiCameraStreamer: Applying config:")
         logging.debug(config)
@@ -87,7 +97,7 @@ class MockStreamer(BaseCamera):
         with self.lock:
 
             # Apply valid config params to Picamera object
-            if not self.state['record_active']:  # If not recording a video
+            if not self.state["record_active"]:  # If not recording a video
 
                 # PiCameraStreamer parameters
                 for key, value in config.items():  # For each provided setting
@@ -101,9 +111,10 @@ class MockStreamer(BaseCamera):
 
             else:
                 raise Exception(
-                    "Cannot update camera config while recording is active.")
+                    "Cannot update camera config while recording is active."
+                )
 
-    def set_zoom(self, zoom_value: float = 1.) -> None:
+    def set_zoom(self, zoom_value: float = 1.0) -> None:
         """
         Change the camera zoom, handling re-centering and scaling.
         """
@@ -119,12 +130,7 @@ class MockStreamer(BaseCamera):
         """Stop the on board GPU camera preview."""
         logging.warning("GPU preview not implemented in mock camera")
 
-
-    def start_recording(
-            self,
-            output,
-            fmt: str = 'h264',
-            quality: int = 15):
+    def start_recording(self, output, fmt: str = "h264", quality: int = 15):
         """Start recording.
 
         Start a new video recording, writing to a output object.
@@ -142,19 +148,19 @@ class MockStreamer(BaseCamera):
             # Start recording method only if a current recording is not running
             logging.warning("Recording not implemented in mock camera")
 
-
     def stop_recording(self):
         """Stop the last started video recording on splitter port 2."""
         with self.lock:
             logging.warning("Recording not implemented in mock camera")
 
     def capture(
-            self,
-            output,
-            fmt: str = 'jpeg',
-            use_video_port: bool = False,
-            resize: Tuple[int, int] = None,
-            bayer: bool = True):
+        self,
+        output,
+        fmt: str = "jpeg",
+        use_video_port: bool = False,
+        resize: Tuple[int, int] = None,
+        bayer: bool = True,
+    ):
         """
         Capture a still image to a StreamObject.
 
@@ -172,20 +178,11 @@ class MockStreamer(BaseCamera):
         with self.lock:
             logging.warning("Capture not implemented in mock camera")
 
-
-    def gen_img(self):
-        imarray = np.random.rand(self.stream_resolution[1], self.stream_resolution[0], 3) * 255
-        im = Image.fromarray(imarray.astype('uint8')).convert('L')
-        im.save(self.stream, format="JPEG")
-
     # HANDLE STREAM FRAMES
 
     def frames(self):
         """
         Create generator that returns frames from the camera.
-
-        Records video from port 1 to a byte stream,
-        and iterates sequential frames.
         """
         # Run this initialisation method
         self.initialisation()
@@ -196,14 +193,7 @@ class MockStreamer(BaseCamera):
         # While the iterator is not closed
         try:
             while True:
-                # reset stream for next frame
-                self.stream.seek(0)
-                self.stream.truncate()
-                # to stream, read the new frame
                 time.sleep(1 / self.framerate * 0.1)
-
-                # yield the result to be read
-                self.gen_img()
                 frame = self.stream.getvalue()
 
                 # ensure the size of package is right