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first attempt with postamble

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DJ2LS 2021-04-11 18:34:03 +02:00 committed by GitHub
parent e21f9b6296
commit 50f088ab5e
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1 changed files with 37 additions and 6 deletions
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43
modem.py
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@ -24,9 +24,12 @@ import data_handler
import Hamlib
class RF():
def __init__(self):
# -------------------------------------------- LOAD FREEDV
libname = pathlib.Path().absolute() / "codec2/build_linux/src/libcodec2.so"
self.c_lib = ctypes.CDLL(libname)
@ -135,12 +138,17 @@ class RF():
n_nom_modem_samples = self.c_lib.freedv_get_n_nom_modem_samples(freedv)
n_tx_modem_samples = self.c_lib.freedv_get_n_tx_modem_samples(freedv) # get n_tx_modem_samples which defines the size of the modulation object
n_tx_preamble_modem_samples = self.c_lib.freedv_get_n_tx_preamble_modem_samples(freedv)
n_tx_postamble_modem_samples = self.c_lib.freedv_get_n_tx_postamble_modem_samples(freedv)
mod_out = ctypes.c_short * n_tx_modem_samples
mod_out = mod_out()
mod_out_preamble = ctypes.c_short * n_tx_preamble_modem_samples # *2 #1760 for mode 10,11,12 #4000 for mode 9
mod_out_preamble = mod_out_preamble()
mod_out_postamble = ctypes.c_short * n_tx_postamble_modem_samples # *2 #1760 for mode 10,11,12 #4000 for mode 9
mod_out_postamble = mod_out_postamble()
buffer = bytearray(payload_per_frame) # use this if CRC16 checksum is required ( DATA1-3)
buffer[:len(data_out)] = data_out # set buffersize to length of data which will be send
@ -151,11 +159,14 @@ class RF():
self.c_lib.freedv_rawdatapreambletx(freedv, mod_out_preamble)
self.c_lib.freedv_rawdatatx(freedv, mod_out, data) # modulate DATA and safe it into mod_out pointer
self.c_lib.freedv_rawdatapostambletx(freedv, mod_out_postamble)
txbuffer = bytearray()
txbuffer += bytes(mod_out_preamble)
txbuffer += bytes(mod_out)
txbuffer += bytes(mod_out_postamble)
# -------------- transmit audio
logging.debug("SENDING SIGNALLING FRAME " + str(data_out))
@ -200,17 +211,23 @@ class RF():
n_nom_modem_samples = self.c_lib.freedv_get_n_nom_modem_samples(freedv)
n_tx_modem_samples = self.c_lib.freedv_get_n_tx_modem_samples(freedv) # *2 #get n_tx_modem_samples which defines the size of the modulation object
n_tx_preamble_modem_samples = self.c_lib.freedv_get_n_tx_preamble_modem_samples(freedv)
n_tx_postamble_modem_samples = self.c_lib.freedv_get_n_tx_postamble_modem_samples(freedv)
mod_out = ctypes.c_short * n_tx_modem_samples
mod_out = mod_out()
mod_out_preamble = ctypes.c_short * n_tx_preamble_modem_samples # *2 #1760 for mode 10,11,12 #4000 for mode 9
mod_out_preamble = mod_out_preamble()
mod_out_postamble = ctypes.c_short * n_tx_postamble_modem_samples # *2 #1760 for mode 10,11,12 #4000 for mode 9
mod_out_postamble = mod_out_postamble()
self.c_lib.freedv_rawdatapreambletx(freedv, mod_out_preamble)
txbuffer = bytearray()
txbuffer += bytes(mod_out_preamble)
if static.ARQ_RPT_RECEIVED == False:
for n in range(0, static.ARQ_TX_N_FRAMES_PER_BURST):
@ -243,7 +260,10 @@ class RF():
data = (ctypes.c_ubyte * static.FREEDV_DATA_BYTES_PER_FRAME).from_buffer_copy(buffer)
self.c_lib.freedv_rawdatatx(freedv, mod_out, data) # modulate DATA and safe it into mod_out pointer
self.c_lib.freedv_rawdatapostambletx(freedv, mod_out_postamble)
txbuffer += bytes(mod_out)
txbuffer += bytes(mod_out_postamble)
elif static.ARQ_RPT_RECEIVED == True:
@ -283,7 +303,12 @@ class RF():
data = (ctypes.c_ubyte * static.FREEDV_DATA_BYTES_PER_FRAME).from_buffer_copy(buffer)
self.c_lib.freedv_rawdatatx(freedv, mod_out, data) # modulate DATA and safe it into mod_out pointer
self.c_lib.freedv_rawdatapostambletx(freedv, mod_out_postamble)
txbuffer += bytes(mod_out)
txbuffer += bytes(mod_out_postamble)
# -------------- transmit audio
@ -352,6 +377,7 @@ class RF():
# demod loop
while (static.CHANNEL_STATE == 'RECEIVING_DATA' and static.ARQ_DATA_CHANNEL_MODE == mode) or (static.CHANNEL_STATE == 'RECEIVING_SIGNALLING' and static.FREEDV_SIGNALLING_MODE == mode):
time.sleep(0.01)
@ -362,15 +388,20 @@ class RF():
nin = self.c_lib.freedv_nin(freedv)
nin = int(nin*(static.AUDIO_SAMPLE_RATE_RX/static.MODEM_SAMPLE_RATE))
data_in = self.stream_rx.read(nin, exception_on_overflow=False)
data_in = audioop.ratecv(data_in,2,1,static.AUDIO_SAMPLE_RATE_RX, static.MODEM_SAMPLE_RATE, None)
data_in = data_in[0]
#data_in = audioop.mul(data_in, 2, 0.5)
#print(audioop.maxpp(data_in, 2))
static.AUDIO_RMS = audioop.rms(data_in, 2)
# self.c_lib.freedv_rawdatarx.argtype = [ctypes.POINTER(ctypes.c_ubyte), data_bytes_out, data_in] # check if really neccessary
nbytes = self.c_lib.freedv_rawdatarx(freedv, bytes_out, data_in) # demodulate audio
# logging.debug(self.c_lib.freedv_get_rx_status(freedv))
#print("listening-" + str(mode) + "-" + str(self.c_lib.freedv_get_rx_status(freedv)))
print("listening-" + str(mode) + " - " + "nin: " + str(nin) + " - " + str(self.c_lib.freedv_get_rx_status(freedv)))
print(static.CHANNEL_STATE)
# -------------STUCK IN SYNC DETECTOR
stuck_in_sync_counter += 1