gstreamer/subprojects/gst-devtools/validate/launcher/apps/gstvalidate.py

#!/usr/bin/env python3
#
# Copyright (c) 2013,Thibault Saunier <thibault.saunier@collabora.com>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this program; if not, write to the
# Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
# Boston, MA 02110-1301, USA.
import argparse
from fractions import Fraction
import os
import copy
import sys
import time
import urllib.parse
import shlex
import socket
import subprocess
import configparser
import json
import glob
import math
from launcher.loggable import Loggable, error

from launcher.baseclasses import GstValidateTest, Test, \
    ScenarioManager, NamedDic, GstValidateTestsGenerator, \
    GstValidateMediaDescriptor, GstValidateEncodingTestInterface, \
    GstValidateBaseTestManager, MediaDescriptor, MediaFormatCombination, VariableFramerateMode

from launcher.utils import path2url, url2path, DEFAULT_TIMEOUT, which, \
    GST_SECOND, Result, Protocols, mkdir, printc, Colors, get_data_file, \
    kill_subprocess, format_config_template, get_fakesink_for_media_type, \
    parse_gsttimeargs, GstCaps

#
# Private global variables     #
#

# definitions of commands to use
parser = argparse.ArgumentParser(add_help=False)
parser.add_argument("--validate-tools-path", dest="validate_tools_path",
                    default="",
                    help="defines the paths to look for GstValidate tools.")
options, args = parser.parse_known_args()

GstValidateBaseTestManager.update_commands(options.validate_tools_path)
AUDIO_ONLY_FILE_TRANSCODING_RATIO = 5

#
# API to be used to create testsuites     #
#

"""
Some info about protocols and how to handle them
"""
GST_VALIDATE_CAPS_TO_PROTOCOL = [("application/x-hls", Protocols.HLS),
                                 ("application/dash+xml", Protocols.DASH)]


def expand_vars_in_list_recurse(lines, data):
    for i, v in enumerate(lines):
        if isinstance(v, dict):
            lines[i] = expand_vars_in_dict_recurse(v, data)
        elif isinstance(v, str):
            lines[i] = v % data
        elif isinstance(v, list):
            lines[i] = expand_vars_in_list_recurse(v, data)

    return lines


def expand_vars_in_dict_recurse(dico, data):
    for key, value in dico.items():
        if isinstance(value, dict):
            dico[key] = expand_vars_in_dict_recurse(value, data)
        elif isinstance(value, str):
            dico[key] = value % data
        elif isinstance(value, list):
            dico[key] = expand_vars_in_list_recurse(value, data)

    return dico


class GstValidateMediaCheckTestsGenerator(GstValidateTestsGenerator):

    def __init__(self, test_manager):
        GstValidateTestsGenerator.__init__(self, "media_check", test_manager)

    def populate_tests(self, uri_minfo_special_scenarios, scenarios):
        for uri, mediainfo, special_scenarios in uri_minfo_special_scenarios:
            protocol = mediainfo.media_descriptor.get_protocol()
            timeout = DEFAULT_TIMEOUT

            classname = "%s.media_check.%s" % (protocol,
                                               os.path.basename(url2path(uri)).replace(".", "_"))
            self.add_test(GstValidateMediaCheckTest(classname,
                                                    self.test_manager.options,
                                                    self.test_manager.reporter,
                                                    mediainfo.media_descriptor,
                                                    uri,
                                                    mediainfo.path,
                                                    timeout=timeout))


class GstValidateTranscodingTestsGenerator(GstValidateTestsGenerator):
    HARD_TIMEOUT_FACTOR = 10

    def __init__(self, test_manager):
        GstValidateTestsGenerator.__init__(self, "transcode", test_manager)

    def populate_tests(self, uri_minfo_special_scenarios, scenarios):
        for uri, mediainfo, special_scenarios in uri_minfo_special_scenarios:
            if mediainfo.media_descriptor.is_image():
                continue

            protocol = mediainfo.media_descriptor.get_protocol()
            if protocol == Protocols.RTSP:
                continue

            options = self.test_manager.options
            for comb in self.test_manager.get_encoding_formats():
                classname = "%s.transcode.to_%s.%s" % (mediainfo.media_descriptor.get_protocol(),
                                                       str(comb).replace(
                                                       ' ', '_'),
                                                       mediainfo.media_descriptor.get_clean_name())

                self.add_test(GstValidateTranscodingTest(classname,
                                                         options,
                                                         self.test_manager.reporter,
                                                         comb,
                                                         uri,
                                                         mediainfo.media_descriptor))


class FakeMediaDescriptor(MediaDescriptor):

    def __init__(self, infos, pipeline_desc):
        MediaDescriptor.__init__(self)
        self._infos = infos
        self._pipeline_desc = pipeline_desc

    def get_path(self):
        return self._infos.get('path', None)

    def get_tracks_caps(self):
        return self._info.get('tracks-caps', [])

    def get_media_filepath(self):
        return self._infos.get('media-filepath', None)

    def get_caps(self):
        return self._infos.get('caps', None)

    def get_uri(self):
        return self._infos.get('uri', None)

    def get_duration(self):
        return int(self._infos.get('duration', 0)) * GST_SECOND

    def get_protocol(self):
        return self._infos.get('protocol', "launch_pipeline")

    def is_seekable(self):
        return self._infos.get('is-seekable', True)

    def is_image(self):
        return self._infos.get('is-image', False)

    def is_live(self):
        return self._infos.get('is-live', False)

    def get_num_tracks(self, track_type):
        return self._infos.get('num-%s-tracks' % track_type,
                               self._pipeline_desc.count(track_type + "sink"))

    def can_play_reverse(self):
        return self._infos.get('plays-reverse', False)


class GstValidateSimpleTestsGenerator(GstValidateTestsGenerator):
    def __init__(self, name, test_manager, tests_dir):
        self.tests_dir = tests_dir
        super().__init__(name, test_manager)

    def populate_tests(self, uri_minfo_special_scenarios, scenarios):
        validatetests = []
        for root, _, files in os.walk(self.tests_dir):
            for f in files:
                name, ext = os.path.splitext(f)
                if ext != ".validatetest":
                    continue

                validatetests.append(os.path.abspath(os.path.join(root, f)))

        for validatetest in self.test_manager.scenarios_manager.discover_scenarios(validatetests):
            pathname, _ext = os.path.splitext(validatetest.path)
            name = pathname.replace(os.path.commonpath([self.tests_dir, root]), '').replace('/', '.')

            self.add_test(GstValidateSimpleTest(validatetest.path,
                                                'test' + name,
                                                self.test_manager.options,
                                                self.test_manager.reporter,
                                                test_info=validatetest))


class GstValidatePipelineTestsGenerator(GstValidateTestsGenerator):

    def __init__(self, name, test_manager, pipeline_template=None,
                 pipelines_descriptions=None, valid_scenarios=None):
        """
        @name: The name of the generator
        @pipeline_template: A template pipeline to be used to generate actual pipelines
        @pipelines_descriptions: A list of tuple of the form:
                                 (test_name, pipeline_description, extra_data)
                                 extra_data being a dictionary with the following keys:
                                    'scenarios': ["the", "valide", "scenarios", "names"]
                                    'duration': the_duration # in seconds
                                    'timeout': a_timeout # in seconds
                                    'hard_timeout': a_hard_timeout # in seconds

        @valid_scenarios: A list of scenario name that can be used with that generator
        """
        valid_scenarios = valid_scenarios or []
        GstValidateTestsGenerator.__init__(self, name, test_manager)
        self._pipeline_template = pipeline_template
        self._pipelines_descriptions = []
        for description in pipelines_descriptions or []:
            if not isinstance(description, dict):
                desc_dict = {"name": description[0],
                     "pipeline": description[1]}
                if len(description) >= 3:
                    desc_dict["extra_data"] = description[2]
                self._pipelines_descriptions.append(desc_dict)
            else:
                self._pipelines_descriptions.append(description)
        self._valid_scenarios = valid_scenarios

    @staticmethod
    def get_config_file(config, private_dir, test_name, extra_data):
        if isinstance(config, str):
            return config

        os.makedirs(private_dir, exist_ok=True)
        config_file = os.path.join(private_dir, test_name + '.config')
        with open(config_file, 'w') as f:
            f.write(format_config_template(extra_data,
                    '\n'.join(config) + '\n', test_name))

        return config_file

    @classmethod
    def from_dict(cls, test_manager, name, descriptions, extra_data=None):
        """
        :param json_file: Path to a JSON file containing pipeline tests.
        :param extra_data: Variables available for interpolation in validate
        configs and scenario actions.
        """
        if extra_data is None:
            extra_data = {}

        pipelines_descriptions = []
        for test_name, defs in descriptions.items():
            tests_definition = {'name': test_name, 'pipeline': defs.pop('pipeline')}
            test_private_dir = os.path.join(test_manager.options.privatedir,
                                            name, test_name)

            config_files = {}
            config = defs.pop('config', None)
            timeout = defs.pop('timeout', DEFAULT_TIMEOUT)
            scenario_defs = defs.pop('scenarios', [])
            if not scenario_defs and config:
                config_files[None] = cls.get_config_file(config, test_private_dir, test_name, extra_data)

            scenarios = []
            for scenario in scenario_defs:
                if isinstance(scenario, str):
                    # Path to a scenario file
                    scenarios.append(scenario)
                    scenario_name = os.path.basename(scenario).replace('.scenario', '')
                    test_private_dir = os.path.join(test_manager.options.privatedir,
                                                    name, test_name, scenario_name)
                else:
                    # Dictionary defining a new scenario in-line
                    scenario_name = scenario_file = scenario['name']
                    test_private_dir = os.path.join(test_manager.options.privatedir,
                                                    name, test_name, scenario_name)
                    actions = scenario.get('actions')
                    if actions:
                        os.makedirs(test_private_dir, exist_ok=True)
                        scenario_file = os.path.join(
                            test_private_dir, scenario_name + '.scenario')
                        with open(scenario_file, 'w') as f:
                            f.write('\n'.join(action % extra_data for action in actions) + '\n')
                    scenarios.append(scenario_file)

                if config:
                    config_files[scenario_name] = cls.get_config_file(config, test_private_dir, test_name + '.' + scenario_name, extra_data)

            local_extra_data = extra_data.copy()
            local_extra_data.update(defs)
            envvars = defs.pop('extra_env_vars', {})
            local_extra_data.update({
                'scenarios': scenarios,
                'config_files': config_files,
                'plays-reverse': True,
                'extra_env_vars': envvars,
                'timeout': timeout,
            })

            expand_vars_in_dict_recurse(local_extra_data, extra_data)
            tests_definition['extra_data'] = local_extra_data
            tests_definition['pipeline_data'] = {}
            tests_definition['pipeline_data'].update(local_extra_data)
            pipelines_descriptions.append(tests_definition)

        return GstValidatePipelineTestsGenerator(name, test_manager, pipelines_descriptions=pipelines_descriptions)

    def get_fname(self, scenario, protocol=None, name=None):
        if name is None:
            name = self.name

        if protocol is not None:
            protocol_str = "%s." % protocol
        else:
            protocol_str = ""

        if scenario is not None and scenario.name.lower() != "none":
            return "%s%s.%s" % (protocol_str, name, scenario.name)

        return ("%s.%s.%s" % (protocol_str, self.name, name)).replace("..", ".")

    def generate_tests(self, uri_minfo_special_scenarios, scenarios):
        if self._valid_scenarios is None:
            scenarios = [None]
        elif self._valid_scenarios:
            scenarios = [scenario for scenario in scenarios if
                         scenario is not None and scenario.name in self._valid_scenarios]

        return super(GstValidatePipelineTestsGenerator, self).generate_tests(
            uri_minfo_special_scenarios, scenarios)

    def populate_tests(self, uri_minfo_special_scenarios, scenarios):

        special_scenarios = []
        for description in self._pipelines_descriptions:
            for s in description.get('extra_data', {}).get('scenarios', []):
                if os.path.isabs(s):
                    special_scenarios.append(s)

        self.test_manager.scenarios_manager.discover_scenarios(special_scenarios)
        for description in self._pipelines_descriptions:
            pipeline = description['pipeline']
            extra_data = description.get('extra_data', {})
            pipeline_data = description.get('pipeline_data', {})

            if 'scenarios' in extra_data:
                # A pipeline description can override the default scenario set.
                # The pipeline description may specify an empty list of
                # scenarios, in which case one test will be generated with no
                # scenario.
                scenarios_to_iterate = extra_data['scenarios'] or [None]
            else:
                scenarios_to_iterate = scenarios

            config_files = extra_data.get('config_files')
            timeout = extra_data.get('timeout', DEFAULT_TIMEOUT)
            mediainfo = extra_data.get(
                'media_info', FakeMediaDescriptor(extra_data, pipeline))
            for scenario in scenarios_to_iterate:
                if isinstance(scenario, str):
                    tmpscenario = self.test_manager.scenarios_manager.get_scenario(
                        scenario)
                    if tmpscenario is None:
                        raise RuntimeError("Could not find scenario file: %s" % scenario)
                    scenario = tmpscenario

                if not mediainfo.is_compatible(scenario):
                    continue

                if self.test_manager.options.mute:
                    needs_clock = scenario.needs_clock_sync() \
                        if scenario else False
                    audiosink = get_fakesink_for_media_type("audio", needs_clock)
                    videosink = get_fakesink_for_media_type("video", needs_clock)
                else:
                    audiosink = 'autoaudiosink'
                    videosink = 'autovideosink'

                pipeline_data.update({'videosink': videosink, 'audiosink': audiosink})
                pipeline_desc = pipeline % pipeline_data

                fname = self.get_fname(
                    scenario, protocol=mediainfo.get_protocol(), name=description["name"])

                expected_issues = extra_data.get("expected-issues")
                extra_env_vars = extra_data.get("extra_env_vars")
                test = GstValidateLaunchTest(fname,
                                             self.test_manager.options,
                                             self.test_manager.reporter,
                                             pipeline_desc,
                                             scenario=scenario,
                                             timeout=timeout,
                                             media_descriptor=mediainfo,
                                             expected_issues=expected_issues,
                                             extra_env_variables=extra_env_vars)
                if config_files:
                    test.add_validate_config(config_files[scenario.name if scenario is not None else None])
                self.add_test(test)


class GstValidatePlaybinTestsGenerator(GstValidatePipelineTestsGenerator):

    def __init__(self, test_manager):
        if os.getenv("USE_PLAYBIN3") is None:
            GstValidatePipelineTestsGenerator.__init__(
                self, "playback", test_manager, "playbin")
        else:
            GstValidatePipelineTestsGenerator.__init__(
                self, "playback", test_manager, "playbin3")

    def _set_sinks(self, minfo, pipe_str, scenario):
        if self.test_manager.options.mute:
            needs_clock = scenario.needs_clock_sync() or minfo.media_descriptor.need_clock_sync()

            afakesink = get_fakesink_for_media_type("audio", needs_clock)
            vfakesink = get_fakesink_for_media_type("video", needs_clock)
            pipe_str += " audio-sink='%s' video-sink='%s'" % (
                afakesink, vfakesink)

        return pipe_str

    def _get_name(self, scenario, protocol, minfo):
        return "%s.%s" % (self.get_fname(scenario,
                                         protocol),
                          os.path.basename(minfo.media_descriptor.get_clean_name()))

    def populate_tests(self, uri_minfo_special_scenarios, scenarios):
        test_rtsp = GstValidateBaseTestManager.RTSP_SERVER_COMMAND
        if not test_rtsp:
            printc("\n\nRTSP server not available, you should make sure"
                   " that %s is available in your $PATH." % GstValidateBaseTestManager.RTSP_SERVER_COMMAND,
                   Colors.FAIL)
        elif self.test_manager.options.disable_rtsp:
            printc("\n\nRTSP tests are disabled")
            test_rtsp = False

        for uri, minfo, special_scenarios in uri_minfo_special_scenarios:
            pipe = self._pipeline_template
            protocol = minfo.media_descriptor.get_protocol()

            if protocol == Protocols.RTSP:
                self.debug("SKIPPING %s as it is a RTSP stream" % uri)
                continue

            pipe += " uri=%s" % uri

            for scenario in special_scenarios + scenarios:
                cpipe = pipe
                if not minfo.media_descriptor.is_compatible(scenario):
                    continue

                cpipe = self._set_sinks(minfo, cpipe, scenario)
                fname = self._get_name(scenario, protocol, minfo)

                self.debug("Adding: %s", fname)

                if scenario.does_reverse_playback() and protocol == Protocols.HTTP:
                    # 10MB so we can reverse playback
                    cpipe += " ring-buffer-max-size=10485760"

                self.add_test(GstValidateLaunchTest(fname,
                                                    self.test_manager.options,
                                                    self.test_manager.reporter,
                                                    cpipe,
                                                    scenario=scenario,
                                                    media_descriptor=minfo.media_descriptor)
                              )

                if test_rtsp and protocol == Protocols.FILE and not minfo.media_descriptor.is_image():
                    rtspminfo = NamedDic({"path": minfo.media_descriptor.get_path(),
                                          "media_descriptor": GstValidateRTSPMediaDescriptor(minfo.media_descriptor.get_path())})
                    if not rtspminfo.media_descriptor.is_compatible(scenario):
                        continue

                    cpipe = self._set_sinks(rtspminfo, "%s uri=rtsp://127.0.0.1:<RTSPPORTNUMBER>/test"
                                            % self._pipeline_template, scenario)
                    fname = self._get_name(scenario, Protocols.RTSP, rtspminfo)

                    self.add_test(GstValidateRTSPTest(
                        fname, self.test_manager.options, self.test_manager.reporter,
                        cpipe, uri, scenario=scenario,
                        media_descriptor=rtspminfo.media_descriptor))

                    fname = self._get_name(scenario, Protocols.RTSP + '2', rtspminfo)
                    self.add_test(GstValidateRTSPTest(
                        fname, self.test_manager.options, self.test_manager.reporter,
                        cpipe, uri, scenario=scenario,
                        media_descriptor=rtspminfo.media_descriptor,
                        rtsp2=True))


class GstValidateCheckAccurateSeekingTestGenerator(GstValidatePipelineTestsGenerator):
    def __new__(cls, name, test_manager, media_infos, extra_data=None):
        pipelines = {}

        for path, reference_frame_dir in media_infos:
            media_info = GstValidateMediaDescriptor(path)
            media_info.set_protocol("file")
            if not media_info:
                error("GstValidateCheckAccurateSeekingTestGenerator",
                      "Could not create a media info file from %s" % path)
                continue

            if media_info.is_image():
                error("GstValidateCheckAccurateSeekingTestGenerator",
                      "%s is an image, can't run accurate seeking tests" % path)
                continue

            if media_info.get_num_tracks("video") < 1:
                error("GstValidateCheckAccurateSeekingTestGenerator",
                      "%s is not a video, can't run accurate seeking tests" % path)
                continue

            if media_info.get_num_tracks("video") < 1:
                error("GstValidateCheckAccurateSeekingTestGenerator",
                      "No video track, can't run accurate seeking tests" % path)
                continue

            if test_manager.options.validate_generate_ssim_reference_files:
                scenario = None
                test_name = media_info.get_clean_name() + '.generate_reference_files'
                config = [
                    'validatessim, element-name="videoconvert", output-dir="%s"' % reference_frame_dir]
            else:
                test_name = media_info.get_clean_name()
                framerate, scenario = cls.generate_scenario(test_manager.options, reference_frame_dir, media_info)
                if scenario is None:
                    error("GstValidateCheckAccurateSeekingTestGenerator",
                        "Could not generate test for media info: %s" % path)
                    continue

                config = [
                    '%(ssim)s, element-name="videoconvert", reference-images-dir="'
                    + reference_frame_dir + '", framerate=%d/%d' % (framerate.numerator, framerate.denominator)
                ]

            source = extra_data.get("source")
            if source is None:
                source = "uridecodebin"
            else:
                test_name = f"{source}.{test_name}"

            pipelines[test_name] = {
                "pipeline": f"{source} uri=" + media_info.get_uri() + " ! deinterlace ! videoconvert ! video/x-raw,interlace-mode=progressive,format=I420 ! videoconvert name=videoconvert ! %(videosink)s",
                "media_info": media_info,
                "config": config,
            }

            if scenario:
                pipelines[test_name]["scenarios"] = [scenario]

        return GstValidatePipelineTestsGenerator.from_dict(test_manager, name, pipelines, extra_data=extra_data)

    @classmethod
    def generate_scenario(cls, options, reference_frame_dir, media_info):
        actions = [
            "description, seek=true, handles-states=true, needs_preroll=true",
            "pause",
        ]

        framerate = None
        for track_type, caps in media_info.get_tracks_caps():
            if track_type == 'video':
                for struct, _ in GstCaps.new_from_str(caps):
                    framerate = struct["framerate"]
            if framerate:
                break
        assert framerate

        n_frames = int((media_info.get_duration() * framerate.numerator) / (GST_SECOND * framerate.denominator))
        frames_timestamps = [math.ceil(i * framerate.denominator * GST_SECOND / framerate.numerator) for i in range(n_frames)]
        # Ensure tests are not longer than long_limit, empirically considering we take 0.2 secs per frames.
        acceptable_n_frames = options.long_limit * 5
        if n_frames > acceptable_n_frames:
            n_frames_per_groups = int(acceptable_n_frames / 3)
            frames_timestamps = frames_timestamps[0:n_frames_per_groups] \
                + frames_timestamps[int(n_frames / 2 - int(n_frames_per_groups / 2)):int(n_frames / 2 + int(n_frames_per_groups / 2))] \
                + frames_timestamps[-n_frames_per_groups:n_frames]

        actions += ['seek, flags=flush+accurate, start=(guint64)%s' % ts for ts in frames_timestamps]
        actions += ['stop']

        return framerate, {
            "name": "check_accurate_seek",
            "actions": actions,
        }


class GstValidateMixerTestsGenerator(GstValidatePipelineTestsGenerator):

    def __init__(self, name, test_manager, mixer, media_type, converter="",
                 num_sources=3, mixed_srcs=None, valid_scenarios=None):
        mixed_srcs = mixed_srcs or {}
        valid_scenarios = valid_scenarios or []

        pipe_template = "%(mixer)s name=_mixer !  " + \
            converter + " ! %(sink)s "
        self.converter = converter
        self.mixer = mixer
        self.media_type = media_type
        self.num_sources = num_sources
        self.mixed_srcs = mixed_srcs
        super(
            GstValidateMixerTestsGenerator, self).__init__(name, test_manager, pipe_template,
                                                           valid_scenarios=valid_scenarios)

    def populate_tests(self, uri_minfo_special_scenarios, scenarios):
        if self.test_manager.options.validate_uris:
            return

        wanted_ressources = []
        for uri, minfo, special_scenarios in uri_minfo_special_scenarios:
            protocol = minfo.media_descriptor.get_protocol()
            if protocol == Protocols.FILE and \
                    minfo.media_descriptor.get_num_tracks(self.media_type) > 0:
                wanted_ressources.append((uri, minfo))

        if not self.mixed_srcs:
            if not wanted_ressources:
                return

            for i in range(len(uri_minfo_special_scenarios) / self.num_sources):
                srcs = []
                name = ""
                for nsource in range(self.num_sources):
                    uri, minfo = wanted_ressources[i + nsource]
                    if os.getenv("USE_PLAYBIN3") is None:
                        srcs.append(
                            "uridecodebin uri=%s ! %s" % (uri, self.converter))
                    else:
                        srcs.append(
                            "uridecodebin3 uri=%s ! %s" % (uri, self.converter))
                    fname = os.path.basename(uri).replace(".", "_")
                    if not name:
                        name = fname
                    else:
                        name += "+%s" % fname

                self.mixed_srcs[name] = tuple(srcs)

        for name, srcs in self.mixed_srcs.items():
            if isinstance(srcs, dict):
                pipe_arguments = {
                    "mixer": self.mixer + " %s" % srcs["mixer_props"]}
                srcs = srcs["sources"]
            else:
                pipe_arguments = {"mixer": self.mixer}

            for scenario in scenarios:
                fname = self.get_fname(scenario, Protocols.FILE) + "."
                fname += name

                self.debug("Adding: %s", fname)

                if self.test_manager.options.mute:
                    pipe_arguments["sink"] = get_fakesink_for_media_type(self.media_type,
                                                                         scenario.needs_clock_sync())
                else:
                    pipe_arguments["sink"] = "auto%ssink" % self.media_type

                pipe = self._pipeline_template % pipe_arguments

                for src in srcs:
                    pipe += "%s ! _mixer. " % src

                self.add_test(GstValidateLaunchTest(fname,
                                                    self.test_manager.options,
                                                    self.test_manager.reporter,
                                                    pipe,
                                                    scenario=scenario)
                              )


class GstValidateSimpleTest(GstValidateTest):
    def __init__(self, test_file, *args, test_info=None, **kwargs):
        self.test_file = test_file
        self.test_info = test_info

        super().__init__(GstValidateBaseTestManager.COMMAND, *args, **kwargs)

    def build_arguments(self):
        self.add_arguments('--set-test-file', self.test_file)
        if self.options.mute:
            self.add_arguments('--use-fakesinks')

    def needs_http_server(self):
        try:
            return bool(self.test_info.needs_http_server)
        except AttributeError:
            return False


class GstValidateLaunchTest(GstValidateTest):

    def __init__(self, classname, options, reporter, pipeline_desc,
                 timeout=DEFAULT_TIMEOUT, scenario=None,
                 media_descriptor=None, duration=0, hard_timeout=None,
                 extra_env_variables=None, expected_issues=None):

        self.extra_env_variables = extra_env_variables or {}

        if scenario:
            duration = scenario.get_duration()
        elif media_descriptor:
            duration = media_descriptor.get_duration() / GST_SECOND

        super(
            GstValidateLaunchTest, self).__init__(GstValidateBaseTestManager.COMMAND,
                                                  classname,
                                                  options, reporter,
                                                  duration=duration,
                                                  scenario=scenario,
                                                  timeout=timeout,
                                                  hard_timeout=hard_timeout,
                                                  media_descriptor=media_descriptor,
                                                  extra_env_variables=extra_env_variables,
                                                  expected_issues=expected_issues)

        self.pipeline_desc = pipeline_desc
        self.media_descriptor = media_descriptor

    def build_arguments(self):
        GstValidateTest.build_arguments(self)
        self.add_arguments(*shlex.split(self.pipeline_desc))
        if self.media_descriptor is not None and self.media_descriptor.get_path():
            self.add_arguments(
                "--set-media-info", self.media_descriptor.get_path())


class GstValidateMediaCheckTest(GstValidateTest):

    def __init__(self, classname, options, reporter, media_descriptor,
                 uri, minfo_path, timeout=DEFAULT_TIMEOUT,
                 extra_env_variables=None,
                 expected_issues=None):
        self.extra_env_variables = extra_env_variables or {}

        super(
            GstValidateMediaCheckTest, self).__init__(GstValidateBaseTestManager.MEDIA_CHECK_COMMAND, classname,
                                                      options, reporter,
                                                      timeout=timeout,
                                                      media_descriptor=media_descriptor,
                                                      extra_env_variables=extra_env_variables,
                                                      expected_issues=expected_issues)
        self._uri = uri
        self._media_info_path = minfo_path

    def build_arguments(self):
        Test.build_arguments(self)
        self.add_arguments(self._uri, "--expected-results",
                           self._media_info_path)

        if self.media_descriptor.skip_parsers():
            self.add_arguments("--skip-parsers")


class GstValidateTranscodingTest(GstValidateTest, GstValidateEncodingTestInterface):
    scenarios_manager = ScenarioManager()

    def __init__(self, classname, options, reporter,
                 combination, uri, media_descriptor,
                 timeout=DEFAULT_TIMEOUT,
                 scenario=None,
                 extra_env_variables=None,
                 expected_issues=None):
        Loggable.__init__(self)

        self.extra_env_variables = extra_env_variables or {}

        file_dur = int(media_descriptor.get_duration()) / GST_SECOND
        if not media_descriptor.get_num_tracks("video"):
            self.debug("%s audio only file applying transcoding ratio."
                       "File 'duration' : %s" % (classname, file_dur))
            duration = file_dur / AUDIO_ONLY_FILE_TRANSCODING_RATIO
        else:
            duration = file_dur

        super(
            GstValidateTranscodingTest, self).__init__(GstValidateBaseTestManager.TRANSCODING_COMMAND,
                                                       classname,
                                                       options,
                                                       reporter,
                                                       duration=duration,
                                                       timeout=timeout,
                                                       scenario=scenario,
                                                       media_descriptor=media_descriptor,
                                                       extra_env_variables=None,
                                                       expected_issues=expected_issues)
        extra_env_variables = extra_env_variables or {}

        GstValidateEncodingTestInterface.__init__(
            self, combination, media_descriptor)

        self.uri = uri

    def run_external_checks(self):
        if self.media_descriptor.get_num_tracks("video") == 1 and \
                self.options.validate_enable_iqa_tests:
            self.run_iqa_test(self.uri)

    def set_rendering_info(self):
        self.dest_file = os.path.join(self.options.dest,
                                      self.classname.replace(".transcode.", os.sep).
                                      replace(".", os.sep))
        mkdir(os.path.dirname(urllib.parse.urlsplit(self.dest_file).path))
        if urllib.parse.urlparse(self.dest_file).scheme == "":
            self.dest_file = path2url(self.dest_file)

        variable_framerate = VariableFramerateMode.DISABLED
        if self.media_descriptor.get_num_tracks("video") == 1:
            caps, = [c for (t, c) in self.media_descriptor.get_tracks_caps() if t == 'video']
            framerate = None
            for struct, _ in GstCaps.new_from_str(caps):
                framerate = struct.get("framerate", None)
                if framerate is not None and \
                        framerate.numerator == 0 and framerate.denominator == 1:
                    variable_framerate = VariableFramerateMode.AUTO
                    break

        profile = self.get_profile(variable_framerate=variable_framerate)
        self.add_arguments("-o", profile)

    def build_arguments(self):
        GstValidateTest.build_arguments(self)
        self.set_rendering_info()
        self.add_arguments(self.uri, self.dest_file)

    def get_current_value(self):
        if self.scenario:
            sent_eos = self.sent_eos_position()
            if sent_eos is not None:
                t = time.time()
                if ((t - sent_eos)) > 30:
                    if self.media_descriptor.get_protocol() == Protocols.HLS:
                        self.set_result(Result.PASSED,
                                        """Got no EOS 30 seconds after sending EOS,
                                        in HLS known and tolerated issue:
                                        https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/issues/132""")
                        return Result.KNOWN_ERROR

                    self.set_result(
                        Result.FAILED, "Pipeline did not stop 30 Seconds after sending EOS")

                    return Result.FAILED

        size = self.get_current_size()
        if size is None:
            return self.get_current_position()

        return size

    def check_results(self):
        self.check_encoded_file()
        GstValidateTest.check_results(self)


class GstValidateBaseRTSPTest:
    """ Interface for RTSP tests, requires implementing Test"""
    __used_ports = set()

    def __init__(self, local_uri):
        self._local_uri = local_uri
        self.rtsp_server = None
        self._unsetport_pipeline_desc = None
        self.optional = True

    @classmethod
    def __get_open_port(cls):
        while True:
            # hackish trick from
            # http://stackoverflow.com/questions/2838244/get-open-tcp-port-in-python?answertab=votes#tab-top
            s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            s.bind(("", 0))
            port = s.getsockname()[1]
            if port not in cls.__used_ports:
                cls.__used_ports.add(port)
                s.close()
                return port

            s.close()

    def launch_server(self):
        if self.options.redirect_logs == 'stdout':
            self.rtspserver_logs = sys.stdout
        elif self.options.redirect_logs == 'stderr':
            self.rtspserver_logs = sys.stderr

        self.server_port = self.__get_open_port()
        command = [GstValidateBaseTestManager.RTSP_SERVER_COMMAND, self._local_uri, '--port', str(self.server_port)]

        if self.options.validate_gdb_server:
            command = self.use_gdb(command)
            self.rtspserver_logs = sys.stdout
        elif self.options.redirect_logs:
            self.rtspserver_logs = sys.stdout
        else:
            self.rtspserver_logs = open(self.logfile + '_rtspserver.log', 'w+')
            self.extra_logfiles.add(self.rtspserver_logs.name)

        server_env = os.environ.copy()

        self.rtsp_server = subprocess.Popen(command,
                                            stderr=self.rtspserver_logs,
                                            stdout=self.rtspserver_logs,
                                            env=server_env)
        while True:
            s = socket.socket()
            try:
                s.connect((("127.0.0.1", self.server_port)))
                break
            except ConnectionRefusedError:
                time.sleep(0.1)
                continue
            finally:
                s.close()

        if not self._unsetport_pipeline_desc:
            self._unsetport_pipeline_desc = self.pipeline_desc

        self.pipeline_desc = self._unsetport_pipeline_desc.replace(
            "<RTSPPORTNUMBER>", str(self.server_port))

        return ' '.join(command)

    def close_logfile(self):
        super().close_logfile()
        if not self.options.redirect_logs:
            self.rtspserver_logs.close()

    def process_update(self):
        res = super().process_update()
        if res:
            kill_subprocess(self, self.rtsp_server, DEFAULT_TIMEOUT)
            self.__used_ports.remove(self.server_port)

        return res


class GstValidateRTSPTest(GstValidateBaseRTSPTest, GstValidateLaunchTest):

    def __init__(self, classname, options, reporter, pipeline_desc,
                 local_uri, timeout=DEFAULT_TIMEOUT, scenario=None,
                 media_descriptor=None, rtsp2=False):
        GstValidateLaunchTest.__init__(self, classname, options, reporter,
                                       pipeline_desc, timeout, scenario,
                                       media_descriptor)
        GstValidateBaseRTSPTest.__init__(self, local_uri)
        self.rtsp2 = rtsp2

    def get_subproc_env(self):
        env = super().get_subproc_env()
        path = env.get('GST_VALIDATE_SCENARIOS_PATH', '')
        override_dir = get_data_file(os.path.join('data', 'scenarios'), 'rtsp_overrides')
        env['GST_VALIDATE_SCENARIOS_PATH'] = '%s:%s' % (override_dir, path)
        if self.rtsp2:
            env['GST_VALIDATE_SCENARIO'] = env.get('GST_VALIDATE_SCENARIO', '') + ':' + 'force_rtsp2'

        return env


class GstValidateRTSPMediaDescriptor(GstValidateMediaDescriptor):

    def __init__(self, xml_path):
        GstValidateMediaDescriptor.__init__(self, xml_path)

    def get_uri(self):
        return "rtsp://127.0.0.1:8554/test"

    def get_protocol(self):
        return Protocols.RTSP

    def prerrols(self):
        return False


class GstValidateTestManager(GstValidateBaseTestManager):

    name = "validate"

    # List of all classes to create testsuites
    GstValidateMediaCheckTestsGenerator = GstValidateMediaCheckTestsGenerator
    GstValidateTranscodingTestsGenerator = GstValidateTranscodingTestsGenerator
    GstValidatePipelineTestsGenerator = GstValidatePipelineTestsGenerator
    GstValidatePlaybinTestsGenerator = GstValidatePlaybinTestsGenerator
    GstValidateMixerTestsGenerator = GstValidateMixerTestsGenerator
    GstValidateCheckAccurateSeekingTestGenerator = GstValidateCheckAccurateSeekingTestGenerator
    GstValidateLaunchTest = GstValidateLaunchTest
    GstValidateMediaCheckTest = GstValidateMediaCheckTest
    GstValidateTranscodingTest = GstValidateTranscodingTest

    def __init__(self):
        super(GstValidateTestManager, self).__init__()
        self._uris = []
        self._run_defaults = True
        self._is_populated = False
        self._default_generators_registered = False

    def init(self):
        for command, name in [
                (GstValidateBaseTestManager.TRANSCODING_COMMAND, "gst-validate-transcoding-1.0"),
                (GstValidateBaseTestManager.COMMAND, "gst-validate-1.0"),
                (GstValidateBaseTestManager.MEDIA_CHECK_COMMAND, "gst-validate-media-check-1.0")]:
            if not command:
                self.error("command not found: %s" % name)
                return False

        return True

    def add_options(self, parser):
        group = parser.add_argument_group("GstValidate tools specific options"
                                          " and behaviours",
                                          description="""When using --wanted-tests, all the scenarios can be used, even those which have
not been tested and explicitly activated if you set use --wanted-tests ALL""")
        group.add_argument("--validate-check-uri", dest="validate_uris",
                           action="append", help="defines the uris to run default tests on")
        group.add_argument("--validate-tools-path", dest="validate_tools_path",
                           action="append", help="defines the paths to look for GstValidate tools.")
        group.add_argument("--validate-gdb-server", dest="validate_gdb_server",
                           help="Run the server in GDB.")
        group.add_argument("--validate-disable-rtsp", dest="disable_rtsp",
                           help="Disable RTSP tests.", default=False, action='store_true')
        group.add_argument("--validate-enable-iqa-tests", dest="validate_enable_iqa_tests",
                           help="Enable Image Quality Assessment validation tests.",
                           default=False, action='store_true')
        group.add_argument("--validate-generate-expectations", dest="validate_generate_expectations",
                           choices=['auto', 'enabled', 'disabled'],
                           help="Force generating expectations (when set to `enabed`)"
                                " force failure on missing expactations when set to `disabled`"
                                " and create if needed when set to `auto`.",
                           default='auto')
        group.add_argument("--validate-generate-ssim-reference-files",
                           help="(re)generate ssim reference image files.",
                           default=False, action='store_true')

    def print_valgrind_bugs(self):
        # Look for all the 'pending' bugs in our supp file
        bugs = []
        p = get_data_file('data', 'gstvalidate.supp')
        with open(p) as f:
            for line in f.readlines():
                line = line.strip()
                if line.startswith('# PENDING:'):
                    tmp = line.split(' ')
                    bugs.append(tmp[2])

        if bugs:
            msg = "Ignored valgrind bugs:\n"
            for b in bugs:
                msg += "  + %s\n" % b
            printc(msg, Colors.FAIL, True)

    def populate_testsuite(self):

        if self._is_populated is True:
            return

        if not self.options.config and not self.options.testsuites:
            if self._run_defaults:
                self.register_defaults()
            else:
                self.register_all()

        self._is_populated = True

    def list_tests(self):
        if self.tests:
            return self.tests

        if self._run_defaults:
            scenarios = [self.scenarios_manager.get_scenario(scenario_name)
                         for scenario_name in self.get_scenarios()]
        else:
            scenarios = self.scenarios_manager.get_scenario(None)
        uris = self._list_uris()

        for generator in self.get_generators():
            for test in generator.generate_tests(uris, scenarios):
                self.add_test(test)

        if not self.tests and not uris and not self.options.wanted_tests:
            self.info("No valid uris present in the path. Check if media files and info files exist")

        return self.tests

    def _add_media(self, media_info, uri=None):
        self.debug("Checking %s", media_info)
        if isinstance(media_info, GstValidateMediaDescriptor):
            media_descriptor = media_info
            media_info = media_descriptor.get_path()
        else:
            media_descriptor = GstValidateMediaDescriptor(media_info)

        try:
            # Just testing that the various mandatory infos are present
            caps = media_descriptor.get_caps()
            if uri is None or media_descriptor.get_protocol() == Protocols.IMAGESEQUENCE:
                uri = media_descriptor.get_uri()

            # Adjust local http uri
            if self.options.http_server_port != 8079 and \
               uri.startswith("http://127.0.0.1:8079/"):
                uri = uri.replace("http://127.0.0.1:8079/",
                                  "http://127.0.0.1:%r/" % self.options.http_server_port, 1)
            media_descriptor.set_protocol(urllib.parse.urlparse(uri).scheme)
            for caps2, prot in GST_VALIDATE_CAPS_TO_PROTOCOL:
                if caps2 == caps:
                    media_descriptor.set_protocol(prot)
                    break

            scenario_bname = media_descriptor.get_media_filepath()
            special_scenarios = self.scenarios_manager.find_special_scenarios(
                scenario_bname)
            self._uris.append((uri,
                               NamedDic({"path": media_info,
                                         "media_descriptor": media_descriptor}),
                               special_scenarios))
        except configparser.NoOptionError as e:
            self.debug("Exception: %s for %s", e, media_info)

    def _discover_file(self, uri, fpath):
        for ext in (GstValidateMediaDescriptor.MEDIA_INFO_EXT,
                GstValidateMediaDescriptor.PUSH_MEDIA_INFO_EXT,
                GstValidateMediaDescriptor.SKIPPED_MEDIA_INFO_EXT):
            try:
                is_push = ext == GstValidateMediaDescriptor.PUSH_MEDIA_INFO_EXT
                is_skipped = ext == GstValidateMediaDescriptor.SKIPPED_MEDIA_INFO_EXT
                media_info = "%s.%s" % (fpath, ext)
                if is_push or is_skipped:
                    if not os.path.exists(media_info):
                        continue
                if is_push:
                    uri = "push" + uri
                args = GstValidateBaseTestManager.MEDIA_CHECK_COMMAND.split(" ")
                args.append(uri)
                if os.path.isfile(media_info) and not self.options.update_media_info and not is_skipped:
                    self._add_media(media_info, uri)
                    continue
                elif fpath.endswith(GstValidateMediaDescriptor.STREAM_INFO_EXT) and not is_skipped:
                    self._add_media(fpath)
                    continue
                elif not self.options.generate_info and not self.options.update_media_info and not self.options.validate_uris:
                    continue
                elif self.options.update_media_info and not os.path.isfile(media_info):
                    self.info(
                        "%s not present. Use --generate-media-info", media_info)
                    continue
                elif os.path.islink(media_info):
                    self.info(
                        "%s is a symlink, not updating and hopefully the actual file gets updated!", media_info)
                    continue

                include_frames = 0
                if self.options.update_media_info:
                    include_frames = 2
                elif self.options.generate_info_full:
                    include_frames = 1

                media_descriptor = GstValidateMediaDescriptor.new_from_uri(
                    uri, True, include_frames, is_push, is_skipped)
                if media_descriptor:
                    self._add_media(media_descriptor, uri)
                else:
                    self.warning("Could not get any descriptor for %s" % uri)

            except subprocess.CalledProcessError as e:
                if self.options.generate_info:
                    printc("Result: Failed", Colors.FAIL)
                else:
                    self.error("Exception: %s", e)
                return False
        return True

    def _list_uris(self):
        if self._uris:
            return self._uris

        if self.options.validate_uris:
            for uri in self.options.validate_uris:
                self._discover_file(uri, uri)
            return self._uris

        if not self.args:
            if isinstance(self.options.paths, str):
                self.options.paths = [os.path.join(self.options.paths)]

            for path in self.options.paths:
                if os.path.isfile(path):
                    path = os.path.abspath(path)
                    self._discover_file(path2url(path), path)
                else:
                    for root, dirs, files in os.walk(path):
                        for f in files:
                            fpath = os.path.abspath(os.path.join(root, f))
                            if os.path.isdir(fpath) or \
                                    fpath.endswith(GstValidateMediaDescriptor.MEDIA_INFO_EXT) or\
                                    fpath.endswith(ScenarioManager.FILE_EXTENSION):
                                continue
                            else:
                                self._discover_file(path2url(fpath), fpath)

        self.debug("Uris found: %s", self._uris)

        return self._uris

    def needs_http_server(self):
        for test in self.list_tests():
            if self._is_test_wanted(test):
                if test.needs_http_server():
                    return True

        return False

    def set_settings(self, options, args, reporter):
        if options.wanted_tests:
            for i in range(len(options.wanted_tests)):
                if "ALL" in options.wanted_tests[i]:
                    self._run_defaults = False
                    options.wanted_tests[
                        i] = options.wanted_tests[i].replace("ALL", "")

        options.validate_default_config = None
        if options.validate_generate_expectations != 'auto':
            options.validate_default_config = os.path.join(options.logsdir, "__validate_default.config")
            with open(options.validate_default_config, 'w') as f:
                val = "true" if options.validate_generate_expectations == "enabled" else "false"
                print("validateflow,generate-expectations=%s" % val, file=f)
        try:
            options.wanted_tests.remove("")
        except ValueError:
            pass

        if options.validate_uris or options.validate_generate_ssim_reference_files:
            self.check_testslist = False

        super(GstValidateTestManager, self).set_settings(
            options, args, reporter)

    def register_defaults(self):
        """
        Registers the defaults:
            * Scenarios to be used
            * Encoding formats to be used
            * Blacklisted tests
            * Test generators
        """
        printc("-> Registering default 'validate' tests... ", end='')
        self.register_default_scenarios()
        self.register_default_encoding_formats()
        self.register_default_blacklist()
        self.register_default_test_generators()
        printc("OK", Colors.OKGREEN)

    def register_default_scenarios(self):
        """
        Registers default test scenarios
        """
        if self.options.long_limit != 0:
            self.add_scenarios([
                "play_15s",
                "reverse_playback",
                "fast_forward",
                "seek_forward",
                "seek_backward",
                "seek_with_stop",
                "switch_audio_track",
                "switch_audio_track_while_paused",
                "switch_subtitle_track",
                "switch_subtitle_track_while_paused",
                "disable_subtitle_track_while_paused",
                "change_state_intensive",
                "scrub_forward_seeking"])
        else:
            self.add_scenarios([
                "play_15s",
                "reverse_playback",
                "fast_forward",
                "seek_forward",
                "seek_backward",
                "seek_with_stop",
                "switch_audio_track",
                "switch_audio_track_while_paused",
                "switch_subtitle_track",
                "switch_subtitle_track_while_paused",
                "disable_subtitle_track_while_paused",
                "change_state_intensive",
                "scrub_forward_seeking"])

    def register_default_encoding_formats(self):
        """
        Registers default encoding formats
        """
        self.add_encoding_formats([
            MediaFormatCombination("ogg", "vorbis", "theora"),
            MediaFormatCombination("webm", "vorbis", "vp8"),
            MediaFormatCombination("webm", "vorbis", "vp9",
                video_restriction="video/x-raw,width=160,height=120"),
            MediaFormatCombination("mp4", "mp3", "h264"),
            MediaFormatCombination("mkv", "vorbis", "h264"),
        ])

    def register_default_blacklist(self):
        self.set_default_blacklist([
            # testbin known issues
            ("testbin.media_check.*",
             "Not supported by GstDiscoverer."),

            # dash known issues
            ("dash.media_check.*",
             "Caps are different depending on selected bitrates, etc"),

            # Matroska/WEBM known issues:
            ("*.reverse_playback.*webm$",
             "https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/issues/65"),
            ("*.reverse_playback.*mkv$",
             "https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/issues/65"),
            ("http.playback.seek_with_stop.*webm",
             "matroskademux.gst_matroska_demux_handle_seek_push: Seek end-time not supported in streaming mode"),
            ("http.playback.seek_with_stop.*mkv",
             "matroskademux.gst_matroska_demux_handle_seek_push: Seek end-time not supported in streaming mode"),

            # MPEG TS known issues:
            ('*.playback.reverse_playback.*(?:_|.)(?:|m)ts$',
             "https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/issues/97", '(?i)'),

            # Fragmented MP4 disabled tests:
            ('*.playback..*seek.*.fragmented_nonseekable_sink_mp4',
             "Seeking on fragmented files without indexes isn't implemented"),
            ('*.playback.reverse_playback.fragmented_nonseekable_sink_mp4',
             "Seeking on fragmented files without indexes isn't implemented"),

            # HTTP known issues:
            ("http.*scrub_forward_seeking.*",
             "This is not stable enough for now."),
            ("http.playback.change_state_intensive.raw_video_mov",
             "This is not stable enough for now. (flow return from pad push doesn't match expected value)"),

            # MXF known issues"
            ("*reverse_playback.*mxf",
             "Reverse playback is not handled in MXF"),
            (r'file\.transcode.*mxf',
             "FIXME: Transcoding and mixing tests need to be tested"),

            # WMV known issues"
            ("*reverse_playback.*wmv",
             "Reverse playback is not handled in wmv"),
            (".*reverse_playback.*asf",
             "Reverse playback is not handled in asf"),

            # ogg known issues
            ("http.playback.seek.*vorbis_theora_1_ogg",
             "https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/issues/281"),
            # RTSP known issues
            ('rtsp.*playback.reverse.*',
             'https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/issues/32'),
            ('rtsp.*playback.seek_with_stop.*',
             'https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/issues/386'),
            ('rtsp.*playback.fast_*',
             'rtpbasedepayload does not handle rate != 1.0 correctly'),
        ])

    def register_default_test_generators(self):
        """
        Registers default test generators
        """
        if self._default_generators_registered:
            return

        self.add_generators([GstValidatePlaybinTestsGenerator(self),
                             GstValidateMediaCheckTestsGenerator(self),
                             GstValidateTranscodingTestsGenerator(self)])
        self._default_generators_registered = True