Adds blks2.stream_to_vector_decimator block.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@8799 221aa14e-8319-0410-a670-987f0aec2ac5

diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/Makefile.am b/gnuradio-core/src/python/gnuradio/blks2impl/Makefile.am
index 934326d8f36af2a5ed5e9d73bd62e68291a899f5..0a8df50cb7d6097a0b6ab748c0c00b3832c2c76a 100644 (file)
--- a/gnuradio-core/src/python/gnuradio/blks2impl/Makefile.am
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/Makefile.am
@@ -55,6 +55,7 @@ grblkspython_PYTHON =         \
        qam256.py               \
        rational_resampler.py   \
        standard_squelch.py     \
+       stream_to_vector_decimator.py \
        wfm_rcv.py              \
        wfm_rcv_pll.py          \
        wfm_tx.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..58b6b68
--- /dev/null
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/stream_to_vector_decimator.py
@@ -0,0 +1,80 @@
+#
+# 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_decimator_block",
+                               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 _update_decimator(self):
+       self._decim = max(1, int(self._sample_rate/self._vec_len/self._vec_rate))
+       self.one_in_n.set_n(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