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Peakyxh
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Add speaker identification with VAD and non-streaming ASR using ALSA (#1463)

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#!/usr/bin/env python3
"""
This script works only on Linux. It uses ALSA for recording.
This script shows how to use Python APIs for speaker identification with
a microphone, a VAD model, and a non-streaming ASR model.
Please see also ./generate-subtitles.py
Usage:
(1) Prepare a text file containing speaker related files.
Each line in the text file contains two columns. The first column is the
speaker name, while the second column contains the wave file of the speaker.
If the text file contains multiple wave files for the same speaker, then the
embeddings of these files are averaged.
An example text file is given below:
foo /path/to/a.wav
bar /path/to/b.wav
foo /path/to/c.wav
foobar /path/to/d.wav
Each wave file should contain only a single channel; the sample format
should be int16_t; the sample rate can be arbitrary.
(2) Download a model for computing speaker embeddings
Please visit
https://github.com/k2-fsa/sherpa-onnx/releases/tag/speaker-recongition-models
to download a model. An example is given below:
wget https://github.com/k2-fsa/sherpa-onnx/releases/download/speaker-recongition-models/wespeaker_zh_cnceleb_resnet34.onnx
Note that `zh` means Chinese, while `en` means English.
(3) Download the VAD model
Please visit
https://github.com/snakers4/silero-vad/raw/master/src/silero_vad/data/silero_vad.onnx
to download silero_vad.onnx
For instance,
wget https://github.com/snakers4/silero-vad/raw/master/src/silero_vad/data/silero_vad.onnx
(4) Please refer to ./generate-subtitles.py
to download a non-streaming ASR model.
(5) Run this script
Assume the filename of the text file is speaker.txt.
python3 ./python-api-examples/speaker-identification-with-vad-non-streaming-asr.py \
--silero-vad-model=/path/to/silero_vad.onnx \
--speaker-file ./speaker.txt \
--model ./wespeaker_zh_cnceleb_resnet34.onnx
"""
import argparse
from collections import defaultdict
from pathlib import Path
from typing import Dict, List, Tuple
import numpy as np
import sherpa_onnx
import soundfile as sf
g_sample_rate = 16000
def register_non_streaming_asr_model_args(parser):
parser.add_argument(
"--tokens",
type=str,
help="Path to tokens.txt",
)
parser.add_argument(
"--encoder",
default="",
type=str,
help="Path to the transducer encoder model",
)
parser.add_argument(
"--decoder",
default="",
type=str,
help="Path to the transducer decoder model",
)
parser.add_argument(
"--joiner",
default="",
type=str,
help="Path to the transducer joiner model",
)
parser.add_argument(
"--paraformer",
default="",
type=str,
help="Path to the model.onnx from Paraformer",
)
parser.add_argument(
"--wenet-ctc",
default="",
type=str,
help="Path to the CTC model.onnx from WeNet",
)
parser.add_argument(
"--whisper-encoder",
default="",
type=str,
help="Path to whisper encoder model",
)
parser.add_argument(
"--whisper-decoder",
default="",
type=str,
help="Path to whisper decoder model",
)
parser.add_argument(
"--whisper-language",
default="",
type=str,
help="""It specifies the spoken language in the input file.
Example values: en, fr, de, zh, jp.
Available languages for multilingual models can be found at
https://github.com/openai/whisper/blob/main/whisper/tokenizer.py#L10
If not specified, we infer the language from the input audio file.
""",
)
parser.add_argument(
"--whisper-task",
default="transcribe",
choices=["transcribe", "translate"],
type=str,
help="""For multilingual models, if you specify translate, the output
will be in English.
""",
)
parser.add_argument(
"--whisper-tail-paddings",
default=-1,
type=int,
help="""Number of tail padding frames.
We have removed the 30-second constraint from whisper, so you need to
choose the amount of tail padding frames by yourself.
Use -1 to use a default value for tail padding.
""",
)
parser.add_argument(
"--decoding-method",
type=str,
default="greedy_search",
help="""Valid values are greedy_search and modified_beam_search.
modified_beam_search is valid only for transducer models.
""",
)
parser.add_argument(
"--feature-dim",
type=int,
default=80,
help="Feature dimension. Must match the one expected by the model",
)
def get_args():
parser = argparse.ArgumentParser(
formatter_class=argparse.ArgumentDefaultsHelpFormatter
)
register_non_streaming_asr_model_args(parser)
parser.add_argument(
"--speaker-file",
type=str,
required=True,
help="""Path to the speaker file. Read the help doc at the beginning of this
file for the format.""",
)
parser.add_argument(
"--model",
type=str,
required=True,
help="Path to the speaker embedding model file.",
)
parser.add_argument(
"--silero-vad-model",
type=str,
required=True,
help="Path to silero_vad.onnx",
)
parser.add_argument("--threshold", type=float, default=0.6)
parser.add_argument(
"--num-threads",
type=int,
default=1,
help="Number of threads for neural network computation",
)
parser.add_argument(
"--debug",
type=bool,
default=False,
help="True to show debug messages",
)
parser.add_argument(
"--provider",
type=str,
default="cpu",
help="Valid values: cpu, cuda, coreml",
)
parser.add_argument(
"--device-name",
type=str,
required=True,
help="""
The device name specifies which microphone to use in case there are several
on your system. You can use
arecord -l
to find all available microphones on your computer. For instance, if it outputs
**** List of CAPTURE Hardware Devices ****
card 3: UACDemoV10 [UACDemoV1.0], device 0: USB Audio [USB Audio]
Subdevices: 1/1
Subdevice #0: subdevice #0
and if you want to select card 3 and device 0 on that card, please use:
plughw:3,0
as the device_name.
""",
)
return parser.parse_args()
def assert_file_exists(filename: str):
assert Path(filename).is_file(), (
f"{filename} does not exist!\n"
"Please refer to "
"https://k2-fsa.github.io/sherpa/onnx/pretrained_models/index.html to download it"
)
def create_recognizer(args) -> sherpa_onnx.OfflineRecognizer:
if args.encoder:
assert len(args.paraformer) == 0, args.paraformer
assert len(args.wenet_ctc) == 0, args.wenet_ctc
assert len(args.whisper_encoder) == 0, args.whisper_encoder
assert len(args.whisper_decoder) == 0, args.whisper_decoder
assert_file_exists(args.encoder)
assert_file_exists(args.decoder)
assert_file_exists(args.joiner)
recognizer = sherpa_onnx.OfflineRecognizer.from_transducer(
encoder=args.encoder,
decoder=args.decoder,
joiner=args.joiner,
tokens=args.tokens,
num_threads=args.num_threads,
sample_rate=args.sample_rate,
feature_dim=args.feature_dim,
decoding_method=args.decoding_method,
debug=args.debug,
)
elif args.paraformer:
assert len(args.wenet_ctc) == 0, args.wenet_ctc
assert len(args.whisper_encoder) == 0, args.whisper_encoder
assert len(args.whisper_decoder) == 0, args.whisper_decoder
assert_file_exists(args.paraformer)
recognizer = sherpa_onnx.OfflineRecognizer.from_paraformer(
paraformer=args.paraformer,
tokens=args.tokens,
num_threads=args.num_threads,
sample_rate=g_sample_rate,
feature_dim=args.feature_dim,
decoding_method=args.decoding_method,
debug=args.debug,
)
elif args.wenet_ctc:
assert len(args.whisper_encoder) == 0, args.whisper_encoder
assert len(args.whisper_decoder) == 0, args.whisper_decoder
assert_file_exists(args.wenet_ctc)
recognizer = sherpa_onnx.OfflineRecognizer.from_wenet_ctc(
model=args.wenet_ctc,
tokens=args.tokens,
num_threads=args.num_threads,
sample_rate=args.sample_rate,
feature_dim=args.feature_dim,
decoding_method=args.decoding_method,
debug=args.debug,
)
elif args.whisper_encoder:
assert_file_exists(args.whisper_encoder)
assert_file_exists(args.whisper_decoder)
recognizer = sherpa_onnx.OfflineRecognizer.from_whisper(
encoder=args.whisper_encoder,
decoder=args.whisper_decoder,
tokens=args.tokens,
num_threads=args.num_threads,
decoding_method=args.decoding_method,
debug=args.debug,
language=args.whisper_language,
task=args.whisper_task,
tail_paddings=args.whisper_tail_paddings,
)
else:
raise ValueError("Please specify at least one model")
return recognizer
def load_speaker_embedding_model(args):
config = sherpa_onnx.SpeakerEmbeddingExtractorConfig(
model=args.model,
num_threads=args.num_threads,
debug=args.debug,
provider=args.provider,
)
if not config.validate():
raise ValueError(f"Invalid config. {config}")
extractor = sherpa_onnx.SpeakerEmbeddingExtractor(config)
return extractor
def load_speaker_file(args) -> Dict[str, List[str]]:
if not Path(args.speaker_file).is_file():
raise ValueError(f"--speaker-file {args.speaker_file} does not exist")
ans = defaultdict(list)
with open(args.speaker_file) as f:
for line in f:
line = line.strip()
if not line:
continue
fields = line.split()
if len(fields) != 2:
raise ValueError(f"Invalid line: {line}. Fields: {fields}")
speaker_name, filename = fields
ans[speaker_name].append(filename)
return ans
def load_audio(filename: str) -> Tuple[np.ndarray, int]:
data, sample_rate = sf.read(
filename,
always_2d=True,
dtype="float32",
)
data = data[:, 0] # use only the first channel
samples = np.ascontiguousarray(data)
return samples, sample_rate
def compute_speaker_embedding(
filenames: List[str],
extractor: sherpa_onnx.SpeakerEmbeddingExtractor,
) -> np.ndarray:
assert len(filenames) > 0, "filenames is empty"
ans = None
for filename in filenames:
print(f"processing {filename}")
samples, sample_rate = load_audio(filename)
stream = extractor.create_stream()
stream.accept_waveform(sample_rate=sample_rate, waveform=samples)
stream.input_finished()
assert extractor.is_ready(stream)
embedding = extractor.compute(stream)
embedding = np.array(embedding)
if ans is None:
ans = embedding
else:
ans += embedding
return ans / len(filenames)
def main():
args = get_args()
print(args)
device_name = args.device_name
print(f"device_name: {device_name}")
alsa = sherpa_onnx.Alsa(device_name)
recognizer = create_recognizer(args)
extractor = load_speaker_embedding_model(args)
speaker_file = load_speaker_file(args)
manager = sherpa_onnx.SpeakerEmbeddingManager(extractor.dim)
for name, filename_list in speaker_file.items():
embedding = compute_speaker_embedding(
filenames=filename_list,
extractor=extractor,
)
status = manager.add(name, embedding)
if not status:
raise RuntimeError(f"Failed to register speaker {name}")
vad_config = sherpa_onnx.VadModelConfig()
vad_config.silero_vad.model = args.silero_vad_model
vad_config.silero_vad.min_silence_duration = 0.25
vad_config.silero_vad.min_speech_duration = 0.25
vad_config.sample_rate = g_sample_rate
if not vad_config.validate():
raise ValueError("Errors in vad config")
window_size = vad_config.silero_vad.window_size
vad = sherpa_onnx.VoiceActivityDetector(vad_config, buffer_size_in_seconds=100)
samples_per_read = int(0.1 * g_sample_rate) # 0.1 second = 100 ms
print("Started! Please speak")
idx = 0
buffer = []
while True:
samples = alsa.read(samples_per_read) # a blocking read
samples = np.array(samples)
buffer = np.concatenate([buffer, samples])
while len(buffer) > window_size:
vad.accept_waveform(buffer[:window_size])
buffer = buffer[window_size:]
while not vad.empty():
if len(vad.front.samples) < 0.5 * g_sample_rate:
# this segment is too short, skip it
vad.pop()
continue
stream = extractor.create_stream()
stream.accept_waveform(
sample_rate=g_sample_rate, waveform=vad.front.samples
)
stream.input_finished()
embedding = extractor.compute(stream)
embedding = np.array(embedding)
name = manager.search(embedding, threshold=args.threshold)
if not name:
name = "unknown"
# Now for non-streaming ASR
asr_stream = recognizer.create_stream()
asr_stream.accept_waveform(
sample_rate=g_sample_rate, waveform=vad.front.samples
)
recognizer.decode_stream(asr_stream)
text = asr_stream.result.text
vad.pop()
print(f"\r{idx}-{name}: {text}")
idx += 1
if __name__ == "__main__":
try:
main()
except KeyboardInterrupt:
print("\nCaught Ctrl + C. Exiting")
... ...