def get_available_video_source_configs():
'''
Returns
-------
(pandas.DataFrame) : Available video source configuration with highest
width and framerate.
.. versionchanged:: 0.3.5
Skip devices with no allowed capabilities.
'''
with nostderr():
from .video_source import (get_video_source_names,
expand_allowed_capabilities,
get_allowed_capabilities)
device_names = get_video_source_names()
frames = []
for device_name_i in device_names:
df_allowed_caps = get_allowed_capabilities(device_name_i)
if df_allowed_caps.shape[0] < 1:
continue
df_source_caps = expand_allowed_capabilities(df_allowed_caps)
df_source_caps.insert(0, 'device_name', device_name_i)
frames.append(df_source_caps)
return pd.concat(frames)
def pipeline_command_from_json(json_source, colorspace='bgr'):
'''
Args
----
json_source (dict) : A dictionary containing at least the keys
`device_name`, `width`, `height`, `framerate_num`, and
`framerate_denom`.
colorspace (str) : Supported values are `bgr` or `rgb`.
Returns
-------
(str) : A pipeline command string compatible with `gst-launch`
terminated with an `appsink` element.
'''
# Import here, since importing `gst` before calling `parse_args` causes
# command-line help to be overridden by GStreamer help.
with nostderr():
from .video_source import VIDEO_SOURCE_PLUGIN, DEVICE_KEY
caps_str = (u'video/x-raw-rgb,width={width:d},height={height:d},'
u'framerate={framerate_num:d}/{framerate_denom:d}'
.format(**json_source))
# Set `(red|green|blue)_mask` to ensure RGB channel order for both YUY2 and
# I420 video sources. If this is not done, red and blue channels might be
# swapped.
#
# See [here][1] for default mask values.
#
# [1]: https://www.freedesktop.org/software/gstreamer-sdk/data/docs/latest/gst-plugins-bad-plugins-0.10/gst-plugins-bad-plugins-videoparse.html#GstVideoParse--blue-mask
if colorspace == 'bgr':
caps_str += (u',red_mask=(int)255,green_mask=(int)65280,'
u'blue_mask=(int)16711680')
device_str = u'{} {}="{}"'.format(VIDEO_SOURCE_PLUGIN, DEVICE_KEY,
json_source['device_name'])
logger.debug('[View] video config device string: %s', device_str)
logger.debug('[View] video config caps string: %s', caps_str)
video_command = ''.join([device_str, ' ! ffmpegcolorspace ! ', caps_str,
' ! appsink name=app-video emit-signals=true'])
return video_command
def on_video_config_menu__activate(self, widget):
with nostderr():
from pygst_utils.video_view.mode import video_mode_dialog
from pygst_utils.video_source import get_source_capabilities
gtk.gdk.threads_init()
df_video_configs = (get_source_capabilities()
.sort_values(['device_name', 'width', 'framerate'],
ascending=[True, True, True]))
df_video_configs = df_video_configs.loc[df_video_configs.width >= 320]
try:
config = video_mode_dialog(df_video_configs=df_video_configs,
title='Select barcode scanner video '
'config')
except RuntimeError:
# User cancelled dialog. Do nothing.
pass
else:
self.set_video_config(config)
def default_video_source():
'''
Returns
-------
(pandas.Series) : Available video source configuration with highest
width and framerate.
'''
with nostderr():
from .video_source import (get_video_source_names,
expand_allowed_capabilities,
get_allowed_capabilities)
device_names = get_video_source_names()
device_name = device_names[0]
df_allowed_caps = get_allowed_capabilities(device_name)
df_source_caps = expand_allowed_capabilities(df_allowed_caps)
df_source_caps.sort_values(['width', 'framerate'], ascending=False, inplace=True)
df_source_caps.insert(0, 'device_name', device_name)
return df_source_caps.iloc[0]
def schema_dialog(schema, data=None, device_name=None, max_width=None,
max_fps=None, **kwargs):
'''
Parameters
----------
schema : dict
jsonschema definition. Each property *must* have a default value.
device_name : False or None or str or list_like, optional
GStreamer video source device name(s).
If `None` (default), first available video device is used.
If `False`, video is disabled.
max_width : int
Maximum video frame width.
max_fps : float
Maximum video frame rate (frames/second).
Returns
-------
dict
json-encodable dictionary containing validated values for properties
included in the specified schema.
Raises
------
KeyError
If no video configuration is found that matches the specified
parameters.
ValueError
If values to not validate.
'''
# TODO Remove pygst code (or at least gracefully handle case where it is
# not available).
if not device_name and device_name is not None:
dialog = SchemaDialog(schema, **kwargs)
else:
with nostderr():
import pygst_utils as pu
gtk.threads_init()
df_modes = pu.get_available_video_source_configs()
query = (df_modes.width == df_modes.width)
if device_name is not None:
if isinstance(device_name, types.StringTypes):
query &= (df_modes.device_name == device_name)
else:
query &= (df_modes.device_name.isin(device_name))
if max_width is not None:
query &= (df_modes.width <= max_width)
if max_fps is not None:
query &= (df_modes.framerate <= max_fps)
df_modes = df_modes.loc[query]
if not df_modes.shape[0]:
raise KeyError('No compatible video mode found.')
config = df_modes.sort_values(['width', 'framerate'],
ascending=False).iloc[0]
pipeline_command = pu.pipeline_command_from_json(config,
colorspace='rgb')
dialog = MetaDataDialog(schema, pipeline_command, **kwargs)
with nostderr():
valid, results = dialog.run(values=data)
if not valid:
raise ValueError('Invalid values.')
return results
from pygtkhelpers.utils import gsignal
from pygtkhelpers.delegates import SlaveView
import gtk
import pandas as pd
from redirect_io import nostderr
with nostderr():
from ..video_source import get_source_capabilities, DeviceNotFound
class VideoModeSelector(SlaveView):
gsignal('video-config-selected', object)
def __init__(self, configs=None):
if configs is None:
try:
self.configs = get_source_capabilities()
except DeviceNotFound:
self.configs = pd.DataFrame(None)
else:
self.configs = configs
super(VideoModeSelector, self).__init__()
def create_ui(self):
self.config_store = gtk.ListStore(int, object, str)
self.set_configs(self.configs)
self.config_combo = gtk.ComboBox(model=self.config_store)
renderer_text = gtk.CellRendererText()
self.config_combo.pack_start(renderer_text, True)
self.config_combo.add_attribute(renderer_text, "text", 2)
