porcupine/demo/c/pvrecorder/sdk/python/demo.py

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#
# Copyright 2021 Picovoice Inc.
#
# You may not use this file except in compliance with the license. A copy of the license is located in the "LICENSE"
# file accompanying this source.
#
# Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
# an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
# specific language governing permissions and limitations under the License.
#
 
 
import argparse
import struct
import wave
from pvrecorder import PvRecorder
 
 
def main():
    parser = argparse.ArgumentParser()
 
    parser.add_argument(
        "--show_audio_devices",
        help="List of audio devices currently available for use.",
        action="store_true")
 
    parser.add_argument(
        "--audio_device_index",
        help="Index of input audio device.",
        type=int,
        default=-1)
 
    parser.add_argument(
        "--output_path",
        help="Path to file to store raw audio.",
        default=None)
 
    args = parser.parse_args()
 
    if args.show_audio_devices:
        devices = PvRecorder.get_audio_devices()
        for i in range(len(devices)):
            print(f"index: {i}, device name: {devices[i]}")
    else:
        device_index = args.audio_device_index
        output_path = args.output_path
 
        recorder = PvRecorder(device_index=device_index, frame_length=512)
        print(f"pvrecorder.py version: {recorder.version}")
 
        recorder.start()
        print(f"Using device: {recorder.selected_device}")
 
        if output_path is not None:
            wavfile = wave.open(output_path, "w")
            wavfile.setparams((1, 2, 16000, 512, "NONE", "NONE"))
 
        try:
            while True:
                pcm = recorder.read()
                if output_path is not None:
                    wavfile.writeframes(struct.pack("h" * len(pcm), *pcm))
 
        except KeyboardInterrupt:
            print("Stopping...")
        finally:
            recorder.delete()
            if output_path is not None:
                wavfile.close()
 
 
if __name__ == "__main__":
    main()