def listen_linux(frame_rate=44100, interval=0.1):
mic = alsaaudio.PCM(alsaaudio.PCM_CAPTURE,
alsaaudio.PCM_NORMAL,
device="default")
mic.setchannels(1)
mic.setrate(44100)
mic.setformat(alsaaudio.PCM_FORMAT_S16_LE)
num_frames = int(round((interval / 2) * frame_rate))
mic.setperiodsize(num_frames)
print("start...")
in_packet = False
packet = []
while True:
l, data = mic.read()
if not l:
continue
chunk = np.fromstring(data, dtype=np.int16)
dom = dominant(frame_rate, chunk)
#print(dom)
if in_packet and match(dom, HANDSHAKE_END_HZ):
byte_stream = extract_packet(packet)
try:
byte_stream = RSCodec(FEC_BYTES).decode(byte_stream)
byte_stream = byte_stream.decode("utf-8")
# change to str to use find(), replace()
byte_stream = str(byte_stream)
# check student number
if (byte_stream.find("201502111") != -1):
# delete student number
byte_stream = byte_stream.replace("201502111", "")
display(byte_stream)
display("")
# play sound without student number
play_linux(byte_stream, interval)
except ReedSolomonError as e:
print("{}: {}".format(e, byte_stream))
packet = []
in_packet = False
elif in_packet:
packet.append(dom)
elif match(dom, HANDSHAKE_START_HZ):
in_packet = True
def listen_linux(frame_rate=44100, interval=0.1):
mic = alsaaudio.PCM(alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NORMAL, device="default")
mic.setchannels(1)
mic.setrate(44100)
mic.setformat(alsaaudio.PCM_FORMAT_S16_LE)
num_frames = int(round((interval / 2) * frame_rate))
mic.setperiodsize(num_frames)
print("start...")
in_packet = False
packet = []
while True:
l, data = mic.read()
if not l:
continue
chunk = np.fromstring(data, dtype=np.int16)
dom = dominant(frame_rate, chunk)
if in_packet and match(dom, HANDSHAKE_END_HZ):
byte_stream, real_output = extract_packet(packet)
try:
byte_stream = RSCodec(FEC_BYTES).decode(byte_stream)
byte_stream = byte_stream.decode("utf-8")
if byte_stream.find("201604148") != -1:
byte_stream = byte_stream.replace("201604148", "",1)
stream_len = len(byte_stream)
stream_len -=1
display(byte_stream)
real_output = real_output[0:stream_len*2]
make_sound(real_output)
else:
pass
except ReedSolomonError as e:
pass
#print("{}: {}".format(e, byte_stream))
packet = []
in_packet = False
elif in_packet:
packet.append(dom)
elif match(dom, HANDSHAKE_START_HZ):
in_packet = True
def listen_linux(frame_rate=44100, interval=0.1):
mic = alsaaudio.PCM(alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NORMAL, device="default")
mic.setchannels(1)
mic.setrate(44100)
mic.setformat(alsaaudio.PCM_FORMAT_S16_LE)
num_frames = int(round((interval / 2) * frame_rate))
mic.setperiodsize(num_frames)
print("start...")
in_packet = False
packet = []
while True:
l, data = mic.read()
if not l:
continue
chunk = np.fromstring(data, dtype=np.int16)
dom = dominant(frame_rate, chunk)
#print(dom)
if in_packet and match(dom, HANDSHAKE_END_HZ):
byte_stream = extract_packet(packet)
temp_list=list(byte_stream)
error_byte=temp_list[-4:]#back 4 error byte
try:
byte_stream = RSCodec(FEC_BYTES).decode(byte_stream)
byte_stream = byte_stream.decode("utf-8")
byte_stream=str(byte_stream)
display(byte_stream)
if byte_stream.find('201701198')!=-1:
byte_stream = byte_stream.replace('201701198' ,'')#remove my num
byte_stream = list(byte_stream) # change to list
byte_stream_dec=[]
for i in byte_stream:
byte_stream_dec.append(ord(i))
# -------------------------
waveform_list = []
byte_stream_dec += error_byte
freq_hz = back_to_hz(byte_stream_dec)
# Samples per second
sps = 44100
# how long
# duration_s = 0.1 * len(freq_hz) # 201701198 --> play twice(9*2)
duration_s = 0.1
each_sample_number = np.arange(0, duration_s* sps)
#print(freq_hz)
for i in freq_hz:
waveform = np.sin(2 * np.pi * i * each_sample_number/sps).astype(np.float32)
waveform_list = np.append(waveform_list, waveform)
sd.play(waveform_list, sps)
time.sleep(duration_s*len(freq_hz)) # important to make perfectly fit
sd.stop()
# --------------------------
except ReedSolomonError as e:
pass
#print("{}: {}".format(e, byte_stream))
packet = []
in_packet = False
elif in_packet:
packet.append(dom)
elif match(dom, HANDSHAKE_START_HZ):
in_packet = True
def listen_linux(frame_rate=44100, interval=0.1):
mic = alsaaudio.PCM(alsaaudio.PCM_CAPTURE, alsaaudio.PCM_NORMAL, device="default")
mic.setchannels(1)
mic.setrate(44100)
mic.setformat(alsaaudio.PCM_FORMAT_S16_LE)
num_frames = int(round((interval / 2) * frame_rate))
mic.setperiodsize(num_frames)
print("start...")
in_packet = False
packet = []
while True:
l, data = mic.read()
if not l:
continue
chunk = np.fromstring(data, dtype=np.int16)
dom = dominant(frame_rate, chunk)
if in_packet and match(dom, HANDSHAKE_END_HZ):
byte_stream = extract_packet(packet)
try:
byte_stream = RSCodec(FEC_BYTES).decode(byte_stream)
byte_stream = byte_stream.decode("utf-8")
#plus
if byte_stream.find("201702002") != -1 :
byte_stream = byte_stream.replace("201702002", "")
display(byte_stream)
ascii_stream = []
i = 0
while i<len(byte_stream):
ord_byte = ord(byte_stream[i])
ascii_stream.append(ord_byte)
i+=1
split_ascii = []
i = 0
while i<len(ascii_stream):
split_ascii.append(int(ascii_stream[i]/16))
split_ascii.append(ascii_stream[i]%16)
i+=1
#print("split_ascii :", split_ascii)
new_freqs = []
i = 0
while i<len(split_ascii):
new_freqs.append(START_HZ+STEP_HZ*split_ascii[i])
i+=1
print(new_freqs)
p=pyaudio.PyAudio()
stream = p.open(format = pyaudio.paFloat32, channels=1, rate=44100, output=True)
for i in new_freqs :
sinx = np.arange(44100)
siny = (np.sin((2.0*np.pi*sinx)*(i/44100))).astype(np.float32)
stream.write(siny.tobytes())
stream.close()
p.terminate()
except ReedSolomonError as e:
pass
#print("{}: {}".format(e, byte_stream))
packet = []
in_packet = False
elif in_packet:
packet.append(dom)
elif match(dom, HANDSHAKE_START_HZ):
in_packet = True
