diff --git a/webrtc/modules/audio_processing/test/py_quality_assessment/apm_quality_assessment-gencfgs.py b/webrtc/modules/audio_processing/test/py_quality_assessment/apm_quality_assessment-gencfgs.py
index d3d3a83a6f..97a1eeb5f6 100755
--- a/webrtc/modules/audio_processing/test/py_quality_assessment/apm_quality_assessment-gencfgs.py
+++ b/webrtc/modules/audio_processing/test/py_quality_assessment/apm_quality_assessment-gencfgs.py
@@ -6,3 +6,96 @@
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
+
+"""Generate .json files with which the APM module can be tested using the
+   apm_quality_assessment.py script.
+"""
+
+import logging
+import os
+
+import quality_assessment.data_access as data_access
+
+OUTPUT_PATH = os.path.abspath('apm_configs')
+
+def _generate_default_overridden(config_override):
+  """
+  For each item in config_override, it overrides the default configuration and
+  writes a new APM configuration file.
+
+  The default settings are loaded via "-all_default".
+  Check "src/webrtc/modules/audio_processing/test/audioproc_float.cc" and search
+  for "if (FLAGS_all_default) {".
+
+  For instance, in 55eb6d621489730084927868fed195d3645a9ec9 the default is this:
+  settings.use_aec = rtc::Optional<bool>(true);
+  settings.use_aecm = rtc::Optional<bool>(false);
+  settings.use_agc = rtc::Optional<bool>(true);
+  settings.use_bf = rtc::Optional<bool>(false);
+  settings.use_ed = rtc::Optional<bool>(false);
+  settings.use_hpf = rtc::Optional<bool>(true);
+  settings.use_ie = rtc::Optional<bool>(false);
+  settings.use_le = rtc::Optional<bool>(true);
+  settings.use_ns = rtc::Optional<bool>(true);
+  settings.use_ts = rtc::Optional<bool>(true);
+  settings.use_vad = rtc::Optional<bool>(true);
+  """
+
+  for config_filename in config_override:
+    config = config_override[config_filename]
+    config['-all_default'] = None
+
+    config_filepath = os.path.join(OUTPUT_PATH, 'default-{}.json'.format(
+        config_filename))
+    logging.debug('config file <%s> | %s', config_filepath, config)
+
+    data_access.AudioProcConfigFile.save(config_filepath, config)
+    logging.info('config file created: <%s>', config_filepath)
+
+
+def generate_all_default_but_one():
+  """
+  Generate configurations in which all the default flags are used but one (one
+  flag at a time is excluded).
+  """
+  CONFIG_SETS = {
+      'no_AEC': {'-aec': 0,},
+      'no_AGC': {'-agc': 0,},
+      'no_HP_filter': {'-hpf': 0,},
+      'no_level_estimator': {'-le': 0,},
+      'no_noise_suppressor': {'-ns': 0,},
+      'no_transient_suppressor': {'-ts': 0,},
+      'no_vad': {'-vad': 0,},
+  }
+
+  return _generate_default_overridden(CONFIG_SETS)
+
+
+def generate_all_default_plus_one():
+  """
+  Generate configuratoins in which all the default flags are used and each
+  unused flag is added one at a time.
+  """
+  CONFIG_SETS = {
+      'with_AECM': {'-aec': 0, '-aecm': 1,},  # AEC and AECM are exclusive.
+      'with_AGC_limiter': {'-agc_limiter': 1,},
+      'with_AEC_delay_agnostic': {'-delay_agnostic': 1,},
+      'with_drift_compensation': {'-drift_compensation': 1,},
+      'with_residual_echo_detector': {'-ed': 1,},
+      'with_AEC_extended_filter': {'-extended_filter': 1,},
+      'with_intelligibility_enhancer': {'-ie': 1,},
+      'with_LC': {'-lc': 1,},
+      'with_refined_adaptive_filter': {'-refined_adaptive_filter': 1,},
+  }
+
+  return _generate_default_overridden(CONFIG_SETS)
+
+
+def main():
+  logging.basicConfig(level=logging.INFO)
+  generate_all_default_plus_one()
+  generate_all_default_but_one()
+
+
+if __name__ == '__main__':
+  main()