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from speech_recognition import AudioData, RequestError, \ | ||
PortableNamedTemporaryFile, UnknownValueError | ||
from mycroft import MYCROFT_ROOT_PATH | ||
import os | ||
from pocketsphinx import pocketsphinx, Jsgf, FsgModel | ||
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class PocketSphinxRecognizer(object): | ||
def __init__(self, language="en-US", language_directory=None, | ||
acoustic_parameters_directory=None, | ||
language_model_file=None, phoneme_dictionary_file=None): | ||
super(PocketSphinxRecognizer, self).__init__() | ||
language = language.lower() | ||
language_directory = language_directory or os.path.join( | ||
MYCROFT_ROOT_PATH, "mycroft/client/speech/recognizer/model", | ||
language) | ||
if not os.path.isdir(language_directory): | ||
raise RequestError( | ||
"missing PocketSphinx language data directory: \"{}\"".format( | ||
language_directory)) | ||
acoustic_parameters_directory = \ | ||
acoustic_parameters_directory or \ | ||
os.path.join(language_directory, "hmm") | ||
if not os.path.isdir(acoustic_parameters_directory): | ||
raise RequestError( | ||
"missing PocketSphinx language model parameters directory: " | ||
"\"{}\"".format(acoustic_parameters_directory)) | ||
language_model_file = language_model_file or os.path.join( | ||
language_directory, language + ".lm") | ||
if not os.path.isfile(language_model_file): | ||
raise RequestError( | ||
"missing PocketSphinx language model file: \"{}\"".format( | ||
language_model_file)) | ||
phoneme_dictionary_file = phoneme_dictionary_file or os.path.join( | ||
language_directory, language + ".dict") | ||
if not os.path.isfile(phoneme_dictionary_file): | ||
raise RequestError( | ||
"missing PocketSphinx phoneme dictionary file: \"{}\"".format( | ||
phoneme_dictionary_file)) | ||
# create decoder object | ||
config = pocketsphinx.Decoder.default_config() | ||
config.set_string("-hmm", | ||
acoustic_parameters_directory) | ||
config.set_string("-lm", language_model_file) | ||
config.set_string("-dict", phoneme_dictionary_file) | ||
config.set_string("-logfn", | ||
os.devnull) | ||
self.decoder = pocketsphinx.Decoder(config) | ||
self.lang = language | ||
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def recognize(self, audio_data, keyword_entries=None, grammar=None): | ||
language = self.lang | ||
assert isinstance(audio_data, | ||
AudioData), "``audio_data`` must be audio data" | ||
assert isinstance(language, str), "``language`` must be a string" | ||
assert keyword_entries is None or all( | ||
isinstance(keyword, | ||
(type(""), type(u""))) and 0 <= sensitivity <= 1 | ||
for keyword, sensitivity in | ||
keyword_entries), "``keyword_entries`` must be ``None`` or" \ | ||
" a list of pairs of strings and " \ | ||
"numbers between 0 and 1" | ||
# obtain audio data | ||
raw_data = audio_data.get_raw_data(convert_rate=16000, | ||
convert_width=2) | ||
# obtain recognition results | ||
if keyword_entries is not None: # explicitly specified set of keywords | ||
with PortableNamedTemporaryFile("w") as f: | ||
# generate a keywords file | ||
f.writelines( | ||
"{} /1e{}/\n".format(keyword, 100 * sensitivity - 110) | ||
for keyword, sensitivity in keyword_entries) | ||
f.flush() | ||
# perform the speech recognition with the keywords file | ||
self.decoder.set_kws("keywords", f.name) | ||
self.decoder.set_search("keywords") | ||
self.decoder.start_utt() # begin utterance processing | ||
self.decoder.process_raw(raw_data, False, | ||
True) | ||
self.decoder.end_utt() # stop utterance processing | ||
elif grammar is not None: # a path to a FSG or JSGF grammar | ||
if not os.path.exists(grammar): | ||
raise ValueError( | ||
"Grammar '{0}' does not exist.".format(grammar)) | ||
grammar_path = os.path.abspath(os.path.dirname(grammar)) | ||
grammar_name = os.path.splitext(os.path.basename(grammar))[0] | ||
fsg_path = "{0}/{1}.fsg".format(grammar_path, grammar_name) | ||
if not os.path.exists( | ||
fsg_path): # create FSG grammar if not available | ||
jsgf = Jsgf(grammar) | ||
rule = jsgf.get_rule("{0}.{0}".format(grammar_name)) | ||
fsg = jsgf.build_fsg(rule, self.decoder.get_logmath(), 7.5) | ||
fsg.writefile(fsg_path) | ||
else: | ||
fsg = FsgModel(fsg_path, self.decoder.get_logmath(), 7.5) | ||
self.decoder.set_fsg(grammar_name, fsg) | ||
self.decoder.set_search(grammar_name) | ||
self.decoder.start_utt() | ||
self.decoder.process_raw(raw_data, False, | ||
True) | ||
self.decoder.end_utt() # stop utterance processing | ||
else: # no keywords, perform freeform recognition | ||
self.decoder.start_utt() # begin utterance processing | ||
self.decoder.process_raw(raw_data, False, | ||
True) | ||
self.decoder.end_utt() # stop utterance processing | ||
# return results | ||
hypothesis = self.decoder.hyp() | ||
if hypothesis is not None: | ||
return hypothesis.hypstr | ||
raise UnknownValueError() # no transcriptions available |