Imported Upstream version 3.2.2

[debian/gnuradio] / gnuradio-core / src / python / gnuradio / blks2impl / stream_to_vector_decimator.py

diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/stream_to_vector_decimator.py b/gnuradio-core/src/python/gnuradio/blks2impl/stream_to_vector_decimator.py
new file mode 100644 (file)
index 0000000..39c8b50
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/stream_to_vector_decimator.py
@@ -0,0 +1,94 @@
+#
+# Copyright 2008 Free Software Foundation, Inc.
+#
+# This file is part of GNU Radio
+#
+# GNU Radio is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3, or (at your option)
+# any later version.
+#
+# GNU Radio is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with GNU Radio; see the file COPYING.  If not, write to
+# the Free Software Foundation, Inc., 51 Franklin Street,
+# Boston, MA 02110-1301, USA.
+#
+
+from gnuradio import gr
+
+class stream_to_vector_decimator(gr.hier_block2):
+    """
+    Convert the stream to a vector, decimate the vector stream to achieve the vector rate.
+    """
+
+    def __init__(self, item_size, sample_rate, vec_rate, vec_len):
+        """
+        Create the block chain.
+        @param item_size the number of bytes per sample
+        @param sample_rate the rate of incoming samples
+        @param vec_rate the rate of outgoing vectors (same units as sample_rate)
+        @param vec_len the length of the outgoing vectors in items
+        """
+        self._vec_rate = vec_rate
+        self._vec_len = vec_len
+        self._sample_rate = sample_rate
+
+        gr.hier_block2.__init__(self, "stream_to_vector_decimator",
+                                gr.io_signature(1, 1, item_size),         # Input signature
+                                gr.io_signature(1, 1, item_size*vec_len)) # Output signature
+
+        s2v = gr.stream_to_vector(item_size, vec_len)
+        self.one_in_n = gr.keep_one_in_n(item_size*vec_len, 1)
+        self._update_decimator()
+        self.connect(self, s2v, self.one_in_n, self)
+
+    def set_sample_rate(self, sample_rate):
+        """
+        Set the new sampling rate and update the decimator.
+        @param sample_rate the new rate
+        """
+        self._sample_rate = sample_rate
+        self._update_decimator()
+
+    def set_vec_rate(self, vec_rate):
+        """
+        Set the new vector rate and update the decimator.
+        @param vec_rate the new rate
+        """
+        self._vec_rate = vec_rate
+        self._update_decimator()
+
+    def set_decimation(self, decim):
+        """
+        Set the decimation parameter directly.
+        @param decim the new decimation
+        """
+        self._decim = max(1, int(round(decim)))
+        self.one_in_n.set_n(self._decim)
+
+    def _update_decimator(self):
+        self._decim = max(1, int(round(self._sample_rate/self._vec_len/self._vec_rate)))
+        self.one_in_n.set_n(self._decim)
+
+    def decimation(self):
+        """
+        Returns the actual decimation.
+        """
+        return self._decim
+
+    def sample_rate(self):
+        """
+        Returns configured sample rate.
+        """
+        return self._sample_rate
+
+    def frame_rate(self):
+        """
+        Returns actual frame rate
+        """
+        return self._sample_rate/self._vec_len/self._decim