import numpy as np


def test_sounddevice_lib():
    import time

    import numpy as np
    from sounddevice import InputStream, OutputStream, sleep as sd_sleep
    """ 
    if no portaudio installed:
    Traceback (most recent call last):
  File "TestSoundCard.py", line 42, in <module>
    test_sounddevice_lib()
  File "TestSoundCard.py", line 5, in test_sounddevice_lib
    import sounddevice as sd
  File "/usr/lib/python3.6/site-packages/sounddevice.py", line 64, in <module>
    raise OSError('PortAudio library not found')
  OSError: PortAudio library not found

    """

    duration = 2.5  # seconds

    rx_buffer = np.ones((10 ** 6, 2), dtype=np.float32)
    global current_rx, current_tx
    current_rx = 0
    current_tx = 0

    def rx_callback(indata: np.ndarray, frames: int, time, status):
        global current_rx
        if status:
            print(status)

        rx_buffer[current_rx:current_rx + frames] = indata
        current_rx += frames

    def tx_callback(outdata: np.ndarray, frames: int, time, status):
        global current_tx
        if status:
            print(status)

        outdata[:] = rx_buffer[current_tx:current_tx + frames]
        current_tx += frames

    with InputStream(channels=2, callback=rx_callback):
        sd_sleep(int(duration * 1000))

    print("Current rx", current_rx)

    with OutputStream(channels=2, callback=tx_callback):
        sd_sleep(int(duration * 1000))

    print("Current tx", current_tx)


def test_pyaudio():
    import pyaudio

    CHUNK = 1024
    p = pyaudio.PyAudio()

    stream = p.open(format=pyaudio.paFloat32,
                    channels=2,
                    rate=48000,
                    input=True,
                    frames_per_buffer=CHUNK)

    print("* recording")

    frames = []

    for i in range(0, 100):
        data = stream.read(CHUNK)
        frames.append(data)

    print("* done recording")

    stream.stop_stream()
    stream.close()
    p.terminate()
    data = b''.join(frames)

    print("* playing")

    p = pyaudio.PyAudio()
    stream = p.open(format=pyaudio.paFloat32,
                    channels=2,
                    rate=48000,
                    output=True,
                    )

    for i in range(0, len(data), CHUNK):
        stream.write(data[i:i+CHUNK])

    stream.stop_stream()
    stream.close()

    p.terminate()

    print("* done playing")


if __name__ == '__main__':
    # test_sounddevice_lib()
    test_pyaudio()