shallow zip-file copy from codec2 e9d726bf20

1 files changed, 49 insertions, 0 deletions

diff --git a/demo/freedv_700d_rx.py b/demo/freedv_700d_rx.py
new file mode 100755
index 0000000..5962a73
--- /dev/null
+++ b/demo/freedv_700d_rx.py
@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+'''
+  Demo receive program for FreeDV API 700D mode.
+
+  cd ~/codec2/build_linux
+  cat ../raw/ve9qrp_10s.raw | ./demo/freedv_700d_tx | ../demo/freedv_700d_rx.py | aplay -f S16_LE
+
+  Credits: Thanks DJ2LS, xssfox, VK5QI
+'''
+
+import ctypes
+from ctypes import *
+import sys
+import pathlib
+import platform
+
+if platform.system() == 'Darwin':
+    libname = pathlib.Path().absolute() / "src/libcodec2.dylib" 
+else:
+    libname = pathlib.Path().absolute() / "src/libcodec2.so" 
+
+# See: https://docs.python.org/3/library/ctypes.html
+ 
+c_lib = ctypes.CDLL(libname)
+
+c_lib.freedv_open.argype = [c_int]
+c_lib.freedv_open.restype = c_void_p
+
+c_lib.freedv_get_n_max_speech_samples.argtype = [c_void_p]
+c_lib.freedv_get_n_max_speech_samples.restype = c_int
+
+c_lib.freedv_nin.argtype = [c_void_p]
+c_lib.freedv_nin.restype = c_int
+
+c_lib.freedv_rx.argtype = [c_void_p, c_char_p, c_char_p]
+c_lib.freedv_rx.restype = c_int
+
+FREEDV_MODE_700D = 7 # from freedv_api.h             
+freedv = cast(c_lib.freedv_open(FREEDV_MODE_700D), c_void_p)
+
+n_max_speech_samples = c_lib.freedv_get_n_max_speech_samples(freedv)
+speech_out = create_string_buffer(2*n_max_speech_samples)
+
+while True:
+    nin = c_lib.freedv_nin(freedv)
+    demod_in = sys.stdin.buffer.read(nin*2)
+    if len(demod_in) == 0: quit()
+    nout = c_lib.freedv_rx(freedv, speech_out, demod_in)
+    sys.stdout.buffer.write(speech_out[:nout*2])