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#!/usr/bin/env python3 | |
"""PyAudioとPySimpleGUIを使ったリアルタイムFFTスペクトル表示.""" | |
# Copyright (C) 2022 by Akira TAMAMORI | |
# This program is free software; you can redistribute it and/or modify | |
# it under the terms of the GNU General Public License as published by | |
# the Free Software Foundation, either version 3 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 General Public License for more details. | |
# You should have received a copy of the GNU General Public License | |
# along with this program. If not, see <http://www.gnu.org/licenses/>. | |
# 参考: https://gist.github.com/KenoLeon/c4c32ee7d0b133b24211a2250d56fdce | |
import numpy as np | |
import pyaudio | |
import PySimpleGUI as sg | |
CHUNK = 1024 | |
RATE = 16000 | |
CHANNEL = 1 | |
pAud = pyaudio.PyAudio() | |
SHORT_MAX = 32767 | |
SHORT_MIN = -32768 | |
EPSIRON = 1.0e-6 | |
FONT = "Any 16" | |
WINSIZE = (512, 300) | |
LAYOUT = [ | |
[ | |
sg.Graph( | |
canvas_size=WINSIZE, | |
graph_bottom_left=(0, -10), | |
graph_top_right=(int(CHUNK / 2), 300), | |
background_color="white", | |
key="-GRAPH-", | |
) | |
], | |
[ | |
sg.Button("収録開始", key="-LISTEN-", font=FONT), | |
sg.Button("収録停止", key="-STOP-", font=FONT, disabled=True), | |
sg.Button("終了", key="-EXIT-", font=FONT), | |
], | |
] | |
WINDOW = sg.Window("Waveform plot", LAYOUT, finalize=True) | |
GRAPH = WINDOW["-GRAPH-"] | |
STREAM = None | |
AUDIODATA = np.array([]) | |
TIMEOUT = 10 # 10 msec for redraw | |
def stop(): | |
"""音声収録を中止する.""" | |
if STREAM is not None: | |
STREAM.stop_stream() | |
STREAM.close() | |
WINDOW["-STOP-"].update(disabled=True) | |
WINDOW["-LISTEN-"].update(disabled=False) | |
def callback(in_data, frame_count, time_info, status): | |
"""PyAudioのstream経由でデータを取得し、プロット用変数に格納する.""" | |
global AUDIODATA | |
AUDIODATA = np.frombuffer(in_data, dtype=np.int16) | |
return (in_data, pyaudio.paContinue) | |
def listen(): | |
"""音声収録を開始する.""" | |
WINDOW["-STOP-"].update(disabled=False) | |
WINDOW["-LISTEN-"].update(disabled=True) | |
stream = pAud.open( | |
format=pyaudio.paInt16, | |
channels=CHANNEL, | |
rate=RATE, | |
input=True, | |
frames_per_buffer=CHUNK, | |
stream_callback=callback, | |
) | |
stream.start_stream() | |
return stream | |
def plotWaveform(): | |
"""FFTスペクトルをグラフに描画する.""" | |
GRAPH.erase() # 再描画 | |
# 軸を描く | |
GRAPH.draw_line((0, 0), (1024, 0)) | |
GRAPH.draw_line((0, SHORT_MIN), (0, SHORT_MIN)) | |
# 軸のラベルを描く | |
GRAPH.draw_text("kHz", location=(500, 10), color="black") | |
# FFTスペクトルプロット | |
fftspec = np.fft.fft(AUDIODATA) | |
fftspec = np.abs(fftspec) ** 2 | |
fftspec = fftspec[0 : int(CHUNK / 2)] | |
fftspec = 20 * np.log10(fftspec + EPSIRON) | |
prev_x = prev_y = None | |
for x, y in enumerate(fftspec): | |
if prev_x is not None: | |
# 前の点と現在の点を線で結ぶ | |
GRAPH.draw_line((prev_x, prev_y), (x, y), color="red") | |
prev_x, prev_y = x, y | |
while True: | |
event, values = WINDOW.read(timeout=TIMEOUT) | |
if event in (sg.WIN_CLOSED, "-EXIT-"): | |
stop() | |
pAud.terminate() | |
break | |
if event == "-LISTEN-": | |
STREAM = listen() | |
elif event == "-STOP-": | |
stop() | |
elif AUDIODATA.size != 0: | |
plotWaveform() | |
WINDOW.close() |
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Hi,
Thank you very much for your comment.
I have updated the code!
Best regards,
Akira