160 lines
6.2 KiB
Python
160 lines
6.2 KiB
Python
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#!/usr/bin/env python
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# Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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#
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# Use of this source code is governed by a BSD-style license
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# that can be found in the LICENSE file in the root of the source
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# tree. An additional intellectual property rights grant can be found
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# in the file PATENTS. All contributing project authors may
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# be found in the AUTHORS file in the root of the source tree.
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import os
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import gviz_api
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import webrtc.data_helper
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def main():
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"""
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This Python script displays a web page with test created with the
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video_quality_measurement program, which is a tool in WebRTC.
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The script requires on two external files and one Python library:
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- A HTML template file with layout and references to the json variables
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defined in this script
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- A data file in Python format, containing the following:
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- test_configuration - a dictionary of test configuration names and values.
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- frame_data_types - a dictionary that maps the different metrics to their
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data types.
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- frame_data - a list of dictionaries where each dictionary maps a metric to
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it's value.
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- The gviz_api.py of the Google Visualization Python API, available at
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http://code.google.com/p/google-visualization-python/
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The HTML file is shipped with the script, while the data file must be
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generated by running video_quality_measurement with the --python flag
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specified.
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"""
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print 'Content-type: text/html\n' # the newline is required!
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page_template_filename = '../templates/chart_page_template.html'
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# The data files must be located in the project tree for app engine being
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# able to access them.
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data_filenames = ['../data/vp8_sw.py', '../data/vp8_hw.py']
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# Will contain info/error messages to be displayed on the resulting page.
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messages = []
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# Load the page HTML template.
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try:
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f = open(page_template_filename)
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page_template = f.read()
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f.close()
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except IOError as e:
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ShowErrorPage('Cannot open page template file: %s<br>Details: %s' %
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(page_template_filename, e))
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return
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# Read data from external Python script files. First check that they exist.
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for filename in data_filenames:
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if not os.path.exists(filename):
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messages.append('Cannot open data file: %s' % filename)
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data_filenames.remove(filename)
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# Read data from all existing input files.
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data_list = []
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test_configurations = []
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names = []
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for filename in data_filenames:
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read_vars = {} # empty dictionary to load the data into.
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execfile(filename, read_vars, read_vars)
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test_configuration = read_vars['test_configuration']
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table_description = read_vars['frame_data_types']
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table_data = read_vars['frame_data']
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# Verify the data in the file loaded properly.
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if not table_description or not table_data:
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messages.append('Invalid input file: %s. Missing description list or '
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'data dictionary variables.' % filename)
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continue
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# Frame numbers appear as number type in the data, but Chart API requires
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# values of the X-axis to be of string type.
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# Change the frame_number column data type:
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table_description['frame_number'] = ('string', 'Frame number')
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# Convert all the values to string types:
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for row in table_data:
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row['frame_number'] = str(row['frame_number'])
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# Store the unique data from this file in the high level lists.
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test_configurations.append(test_configuration)
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data_list.append(table_data)
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# Name of the test run must be present.
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test_name = FindConfiguration(test_configuration, 'name')
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if not test_name:
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messages.append('Invalid input file: %s. Missing configuration key '
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'"name"', filename)
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continue
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names.append(test_name)
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# Create data helper and build data tables for each graph.
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helper = webrtc.data_helper.DataHelper(data_list, table_description,
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names, messages)
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# Loading it into gviz_api.DataTable objects and create JSON strings.
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description, data = helper.CreateConfigurationTable(test_configurations)
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configurations = gviz_api.DataTable(description, data)
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json_configurations = configurations.ToJSon() # pylint: disable=W0612
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description, data = helper.CreateData('ssim')
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ssim = gviz_api.DataTable(description, data)
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# pylint: disable=W0612
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json_ssim_data = ssim.ToJSon(helper.GetOrdering(description))
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description, data = helper.CreateData('psnr')
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psnr = gviz_api.DataTable(description, data)
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# pylint: disable=W0612
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json_psnr_data = psnr.ToJSon(helper.GetOrdering(description))
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description, data = helper.CreateData('packets_dropped')
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packet_loss = gviz_api.DataTable(description, data)
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# pylint: disable=W0612
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json_packet_loss_data = packet_loss.ToJSon(helper.GetOrdering(description))
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description, data = helper.CreateData('bit_rate')
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# Add a column of data points for the desired bit rate to be plotted.
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# (uses test configuration from the last data set, assuming it is the same
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# for all of them)
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desired_bit_rate = FindConfiguration(test_configuration, 'bit_rate_in_kbps')
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if not desired_bit_rate:
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ShowErrorPage('Cannot configuration field named "bit_rate_in_kbps"')
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return
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desired_bit_rate = int(desired_bit_rate)
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# Add new column data type description.
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description['desired_bit_rate'] = ('number', 'Desired bit rate (kbps)')
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for row in data:
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row['desired_bit_rate'] = desired_bit_rate
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bit_rate = gviz_api.DataTable(description, data)
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# pylint: disable=W0612
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json_bit_rate_data = bit_rate.ToJSon(helper.GetOrdering(description))
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# Format the messages list with newlines.
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messages = '\n'.join(messages)
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# Put the variables as JSon strings into the template.
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print page_template % vars()
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def FindConfiguration(configuration, name):
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""" Finds a configuration value using it's name.
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Returns the first configuration with a matching name. Returns None if no
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matching configuration is found. """
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return_value = None
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for row in configuration:
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if row['name'] == name:
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return_value = row['value']
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break
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return return_value
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def ShowErrorPage(error_message):
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print '<html><body>%s</body></html>' % error_message
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if __name__ == '__main__':
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main()
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