bugfix

kivycv/audio.py

@@ -50,6 +50,14 @@ class Audio(AppLogger, pyaudio.PyAudio):
 			print(x)
 		return dev_cnt - 1
 
+	def write_audiofile(self, fn, audio_data, channels=2, rate=44100):
+		wf = wave.open(fn, 'wb')
+		wf.setnchannels(channels)
+		wf.setsampwidth(2)
+		wf.setframerate(rate)
+		wf.writeframesraw(audio_data)
+		wf.close()
+
 	def start_record(self, 
 						savefile=None, 
 						channels=2,
@@ -73,6 +81,7 @@ class Audio(AppLogger, pyaudio.PyAudio):
 
 	def stop_record(self):
 		if self.recording:
+			self.recording = False
 			self.stream.stop_stream()
 			self.stream.close()
 			self.wavfile.close()
@@ -87,17 +96,28 @@ class Audio(AppLogger, pyaudio.PyAudio):
 			time.sleep(0.1)
 		self.stop_record()
 
+	def get_audio_spec(self, audiofile):
+		wavfile = wave.open(audiofile, 'rb')
+		sampwidth = wavfile.getsampwidth()
+		format = self.get_format_from_width(sampwidth)
+		framerate=wavfile.getframerate()
+		channels = wavfile.getnchannels()
+		return {
+			"format":format,
+			"sampwidth":sampwidth,
+			"framerate":framerate,
+			"channels":channels
+		}
+		
 	def replay(self, play_file=None):
 		idx = self.get_output_index()
 		x = self.get_device_info_by_index(idx)
 		y = self.get_default_input_device_info()
-		self.info('default_input=%s, default_output=%s', y, x)
 		if play_file is None:
 			play_file = self.temp_filename
 		self.wavfile = wave.open(play_file, 'rb')
 		format = self.get_format_from_width(self.wavfile.getsampwidth())
 		framerate=self.wavfile.getframerate()
-		self.info('format=%s, framerate=%s', format, framerate)
 		self.stream = self.open(format=format,
 						channels=self.wavfile.getnchannels(),
 						rate=framerate,
@@ -112,10 +132,6 @@ class Audio(AppLogger, pyaudio.PyAudio):
 		self.stream.close()
 		self.wavfile.close()
 
-	def __del__(self):
-		if self.temp_filename:
-			os.remove(self.temp_filename)
-
 if __name__ == '__main__':
 	import sys
 	t_begin = time.time()

kivycv/xcamera/__init__.py

@@ -0,0 +1,15 @@
+"""
+Exposes `XCamera` directly in `xcamera` rather than `xcamera.xcamera`.
+Also note this may break `pip` since all imports within `xcamera.py` would be
+required at setup time. This is because `version.py` (same directory) is used
+by the `setup.py` file.
+Hence we're not exposing `XCamera` if `pip` is detected.
+"""
+import os
+
+project_dir = os.path.abspath(
+    os.path.join(__file__, os.pardir, os.pardir, os.pardir, os.pardir))
+using_pip = os.path.basename(project_dir).startswith('pip-')
+# only exposes `XCamera` if not within `pip` ongoing install
+if not using_pip:
+    from .xcamera import XCamera  # noqa

kivycv/xcamera/android_api.py

@@ -0,0 +1,85 @@
+from kivy.logger import Logger
+
+from jnius import JavaException, PythonJavaClass, autoclass, java_method
+
+Camera = autoclass('android.hardware.Camera')
+AndroidActivityInfo = autoclass('android.content.pm.ActivityInfo')
+AndroidPythonActivity = autoclass('org.kivy.android.PythonActivity')
+PORTRAIT = AndroidActivityInfo.SCREEN_ORIENTATION_PORTRAIT
+LANDSCAPE = AndroidActivityInfo.SCREEN_ORIENTATION_LANDSCAPE
+
+
+class ShutterCallback(PythonJavaClass):
+    __javainterfaces__ = ('android.hardware.Camera$ShutterCallback', )
+
+    @java_method('()V')
+    def onShutter(self):
+        # apparently, it is enough to have an empty shutter callback to play
+        # the standard shutter sound. If you pass None instead of shutter_cb
+        # below, the standard sound doesn't play O_o
+        pass
+
+
+class PictureCallback(PythonJavaClass):
+    __javainterfaces__ = ('android.hardware.Camera$PictureCallback', )
+
+    def __init__(self, filename, on_success):
+        super(PictureCallback, self).__init__()
+        self.filename = filename
+        self.on_success = on_success
+
+    @java_method('([BLandroid/hardware/Camera;)V')
+    def onPictureTaken(self, data, camera):
+        s = data.tostring()
+        with open(self.filename, 'wb') as f:
+            f.write(s)
+        Logger.info('xcamera: picture saved to %s', self.filename)
+        camera.startPreview()
+        self.on_success(self.filename)
+
+
+class AutoFocusCallback(PythonJavaClass):
+    __javainterfaces__ = ('android.hardware.Camera$AutoFocusCallback', )
+
+    def __init__(self, filename, on_success):
+        super(AutoFocusCallback, self).__init__()
+        self.filename = filename
+        self.on_success = on_success
+
+    @java_method('(ZLandroid/hardware/Camera;)V')
+    def onAutoFocus(self, success, camera):
+        if success:
+            Logger.info('xcamera: autofocus succeeded, taking picture...')
+            shutter_cb = ShutterCallback()
+            picture_cb = PictureCallback(self.filename, self.on_success)
+            camera.takePicture(shutter_cb, None, picture_cb)
+        else:
+            Logger.info('xcamera: autofocus failed')
+
+
+def take_picture(camera_widget, filename, on_success):
+    # to call the android API, we need access to the underlying
+    # android.hardware.Camera instance. However, there is no official way to
+    # retrieve it from the camera widget, so we need to dig into internal
+    # attributes :-( This works at least on kivy 1.9.1, but it might break any
+    # time soon.
+    camera = camera_widget._camera._android_camera
+    params = camera.getParameters()
+    params.setFocusMode("auto")
+    camera.setParameters(params)
+    cb = AutoFocusCallback(filename, on_success)
+    Logger.info('xcamera: starting autofocus...')
+    try:
+        camera.autoFocus(cb)
+    except JavaException as e:
+        Logger.info('Error when calling autofocus: {}'.format(e))
+
+
+def set_orientation(value):
+    previous = get_orientation()
+    AndroidPythonActivity.mActivity.setRequestedOrientation(value)
+    return previous
+
+
+def get_orientation():
+    return AndroidPythonActivity.mActivity.getRequestedOrientation()

kivycv/xcamera/main.py

@@ -0,0 +1,43 @@
+#!/usr/bin/env python
+from kivy.app import App
+from kivy.lang import Builder
+
+kv = """
+#:import XCamera kivy_garden.xcamera.XCamera
+
+FloatLayout:
+    orientation: 'vertical'
+
+    XCamera:
+        id: xcamera
+        on_picture_taken: app.picture_taken(*args)
+
+    BoxLayout:
+        orientation: 'horizontal'
+        size_hint: 1, None
+        height: sp(50)
+
+        Button:
+            text: 'Set landscape'
+            on_release: xcamera.force_landscape()
+
+        Button:
+            text: 'Restore orientation'
+            on_release: xcamera.restore_orientation()
+"""
+
+
+class CameraApp(App):
+    def build(self):
+        return Builder.load_string(kv)
+
+    def picture_taken(self, obj, filename):
+        print('Picture taken and saved to {}'.format(filename))
+
+
+def main():
+    CameraApp().run()
+
+
+if __name__ == '__main__':
+    main()

kivycv/xcamera/platform_api.py

@@ -0,0 +1,37 @@
+from kivy.utils import platform
+
+
+def play_shutter():
+    # bah, apparently we need to delay the import of kivy.core.audio, lese
+    # kivy cannot find a camera provider, at lease on linux. Maybe a
+    # gstreamer/pygame issue?
+    from kivy.core.audio import SoundLoader
+    sound = SoundLoader.load("data/shutter.wav")
+    sound.play()
+
+
+if platform == 'android':
+    from .android_api import (
+        LANDSCAPE, PORTRAIT, take_picture, set_orientation, get_orientation)
+
+else:
+
+    # generic fallback for taking pictures. Probably not the best quality,
+    # they are meant mostly for testing
+    LANDSCAPE = 'landscape'
+    PORTRAIT = 'portrait'
+
+    def take_picture(camera_widget, filename, on_success):
+        camera_widget.texture.save(filename, flipped=False)
+        play_shutter()
+        on_success(filename)
+
+    def set_orientation(value):
+        previous = get_orientation()
+        print('FAKE orientation set to {}'.format(value))
+        get_orientation.value = value
+        return previous
+
+    def get_orientation():
+        return get_orientation.value
+    get_orientation.value = PORTRAIT

kivycv/xcamera/version.py

@@ -0,0 +1 @@
+__version__ = '2020.0613'

kivycv/xcamera/xcamera.py

@@ -0,0 +1,116 @@
+import datetime
+import os
+
+from kivy.clock import mainthread
+from kivy.lang import Builder
+from kivy.properties import ObjectProperty
+from kivy.resources import resource_add_path
+from kivy.uix.behaviors import ButtonBehavior
+from kivy.uix.camera import Camera
+from kivy.uix.label import Label
+from kivy.utils import platform
+
+from .platform_api import LANDSCAPE, set_orientation, take_picture
+
+ROOT = os.path.dirname(os.path.abspath(__file__))
+resource_add_path(ROOT)
+
+
+def darker(color, factor=0.5):
+    r, g, b, a = color
+    r *= factor
+    g *= factor
+    b *= factor
+    return r, g, b, a
+
+
+def get_filename():
+    return datetime.datetime.now().strftime('%Y-%m-%d %H.%M.%S.jpg')
+
+
+def is_android():
+    return platform == 'android'
+
+
+def check_camera_permission():
+    """
+    Android runtime `CAMERA` permission check.
+    """
+    if not is_android():
+        return True
+    from android.permissions import Permission, check_permission
+    permission = Permission.CAMERA
+    return check_permission(permission)
+
+
+def check_request_camera_permission(callback=None):
+    """
+    Android runtime `CAMERA` permission check & request.
+    """
+    had_permission = check_camera_permission()
+    if not had_permission:
+        from android.permissions import Permission, request_permissions
+        permissions = [Permission.CAMERA]
+        request_permissions(permissions, callback)
+    return had_permission
+
+
+class XCameraIconButton(ButtonBehavior, Label):
+    pass
+
+
+class XCamera(Camera):
+    directory = ObjectProperty(None)
+    _previous_orientation = None
+    __events__ = ('on_picture_taken', 'on_camera_ready')
+
+    def __init__(self, **kwargs):
+        # Builder.load_file(os.path.join(ROOT, "xcamera.kv"))
+        super().__init__(**kwargs)
+
+    def _on_index(self, *largs):
+        """
+        Overrides `kivy.uix.camera.Camera._on_index()` to make sure
+        `camera.open()` is not called unless Android `CAMERA` permission is
+        granted, refs #5.
+        """
+        @mainthread
+        def on_permissions_callback(permissions, grant_results):
+            """
+            On camera permission callback calls parent `_on_index()` method.
+            """
+            if all(grant_results):
+                self._on_index_dispatch(*largs)
+        if check_request_camera_permission(callback=on_permissions_callback):
+            self._on_index_dispatch(*largs)
+
+    def _on_index_dispatch(self, *largs):
+        super()._on_index(*largs)
+        self.dispatch('on_camera_ready')
+
+    def on_picture_taken(self, filename):
+        """
+        This event is fired every time a picture has been taken.
+        """
+        pass
+
+    def on_camera_ready(self):
+        """
+        Fired when the camera is ready.
+        """
+        pass
+
+    def shoot(self):
+        def on_success(filename):
+            self.dispatch('on_picture_taken', filename)
+        filename = get_filename()
+        if self.directory:
+            filename = os.path.join(self.directory, filename)
+        take_picture(self, filename, on_success)
+
+    def force_landscape(self):
+        self._previous_orientation = set_orientation(LANDSCAPE)
+
+    def restore_orientation(self):
+        if self._previous_orientation is not None:
+            set_orientation(self._previous_orientation)