44 lines
1.2 KiB
Python
44 lines
1.2 KiB
Python
#!/usr/bin/env python
|
|
|
|
"""
|
|
Example code from here: https://github.com/dnet/pySSTV/blob/master/pysstv/examples/pyaudio_sstv.py
|
|
"""
|
|
|
|
|
|
from __future__ import division
|
|
from pysstv.sstv import SSTV
|
|
from time import sleep
|
|
from itertools import islice
|
|
import struct, pyaudio
|
|
|
|
|
|
class PyAudioSSTV(object):
|
|
def __init__(self, sstv):
|
|
self.pa = pyaudio.PyAudio()
|
|
self.sstv = sstv
|
|
self.fmt = "<" + SSTV.BITS_TO_STRUCT[sstv.bits]
|
|
|
|
def __del__(self):
|
|
self.pa.terminate()
|
|
|
|
def execute(self):
|
|
self.sampler = self.sstv.gen_samples()
|
|
stream = self.pa.open(
|
|
format=self.pa.get_format_from_width(self.sstv.bits // 8),
|
|
channels=1,
|
|
rate=self.sstv.samples_per_sec,
|
|
output=True,
|
|
stream_callback=self.callback,
|
|
)
|
|
stream.start_stream()
|
|
while stream.is_active():
|
|
sleep(0.5)
|
|
stream.stop_stream()
|
|
stream.close()
|
|
|
|
def callback(self, in_data, frame_count, time_info, status):
|
|
frames = "".join(
|
|
struct.pack(self.fmt, b) for b in islice(self.sampler, frame_count)
|
|
)
|
|
return frames, pyaudio.paContinue
|