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morse CW keyer using jack
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| #!/usr/bin/env python3 | |
| import jack | |
| import curses | |
| import queue | |
| from math import sin, pi | |
| f = 700 # Hz | |
| #duration = 0.240 # seconds | |
| duration = 0.080 # seconds | |
| latency = 0.020 # seconds | |
| stdscr = curses.initscr() | |
| stdscr.nodelay(True) | |
| client = jack.Client("synth-cw") | |
| audioport = client.outports.register("audio_out") | |
| fs = client.samplerate | |
| client.blocksize = int(latency * fs) | |
| q = queue.Queue() | |
| cw_left = 0 | |
| silence_left = 0 | |
| @client.set_process_callback | |
| def process(frames): | |
| global cw_left, silence_left | |
| if cw_left == 0 and silence_left == 0: | |
| try: | |
| item = q.get_nowait() | |
| except queue.Empty: | |
| return | |
| if item == '.': | |
| cw_left = int(duration * fs) | |
| silence_left = int(duration * fs) | |
| elif item == '-': | |
| cw_left = int(3 * duration * fs) | |
| silence_left = int(duration * fs) | |
| buf = memoryview(audioport.get_buffer()).cast('f') | |
| i = 0 | |
| while cw_left > 0 and i < len(buf): | |
| buf[i] = sin(2*pi*cw_left*f/fs) | |
| cw_left -= 1 | |
| i += 1 | |
| while silence_left > 0 and i < len(buf): | |
| buf[i] = 0 | |
| silence_left -= 1 | |
| i += 1 | |
| with client: | |
| # comment the following 3 lines if you don't want to autoconnect to system's output | |
| target_ports = client.get_ports(is_physical=True, is_input=True, is_audio=True) | |
| audioport.connect(target_ports[0]) | |
| audioport.connect(target_ports[1]) | |
| while True: | |
| c = stdscr.getch() | |
| if c == ord('.') or c == ord('-'): | |
| q.put(chr(c)) | |
| elif c == ord('\n'): | |
| stdscr.clear() |
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