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-rw-r--r--src/gr-fadingui/python/CMakeLists.txt2
-rw-r--r--src/gr-fadingui/python/datasource.py4
-rw-r--r--src/gr-fadingui/python/qa_xor_frame_sync.py56
-rw-r--r--src/gr-fadingui/python/xor_frame_sync.py101
4 files changed, 127 insertions, 36 deletions
diff --git a/src/gr-fadingui/python/CMakeLists.txt b/src/gr-fadingui/python/CMakeLists.txt
index 1318857..6ee73d3 100644
--- a/src/gr-fadingui/python/CMakeLists.txt
+++ b/src/gr-fadingui/python/CMakeLists.txt
@@ -47,4 +47,4 @@ include(GrTest)
set(GR_TEST_TARGET_DEPS gnuradio-fadingui)
set(GR_TEST_PYTHON_DIRS ${CMAKE_BINARY_DIR}/swig)
-GR_ADD_TEST(qa_dearpygui_sink ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_dearpygui_sink.py)
+GR_ADD_TEST(qa_xor_frame_sync ${PYTHON_EXECUTABLE} ${CMAKE_CURRENT_SOURCE_DIR}/qa_xor_frame_sync.py)
diff --git a/src/gr-fadingui/python/datasource.py b/src/gr-fadingui/python/datasource.py
index 12573a8..38771c5 100644
--- a/src/gr-fadingui/python/datasource.py
+++ b/src/gr-fadingui/python/datasource.py
@@ -35,7 +35,7 @@ class datasource(gr.basic_block):
# a frame has 5 id bits so, there can only be 2 ** 5 chunks per file
# see docstring of frame_obj for more details
nblocks = int(self.fsize / self.frame.payload_length)
- log.debug(f"Loaded {self.fsize} bytes = {nblocks} blocks from {self.fname}")
+ log.debug(f"Loaded {self.fsize} bytes == {nblocks} blocks from {self.fname}")
assert nblocks < 2 ** 5, "Payload size too small or file too big"
self.fpos = 0
@@ -73,7 +73,7 @@ class datasource(gr.basic_block):
self.outbuffer = frame_bytes[len(out):]
log.debug(f"Sent frame nr={self.blocknr}")
- log.debug(f"Set bytes {out}")
+ log.debug(f"Sent bytes {out}")
self.fpos += self.frame.payload_length
self.blocknr += 1
diff --git a/src/gr-fadingui/python/qa_xor_frame_sync.py b/src/gr-fadingui/python/qa_xor_frame_sync.py
new file mode 100644
index 0000000..280c694
--- /dev/null
+++ b/src/gr-fadingui/python/qa_xor_frame_sync.py
@@ -0,0 +1,56 @@
+#!/usr/bin/env python
+
+from gnuradio import gr, gr_unittest, blocks
+
+from xor_frame_sync import xor_frame_sync
+import numpy as np
+
+
+class test_xor_frame_sync(gr_unittest.TestCase):
+
+ def setUp(self):
+ self.tb = gr.top_block()
+
+ def tearDown(self):
+ self.tb = None
+
+ def test_001(self):
+ """Test a byte aligned delay"""
+ pattern = np.array([0xbe, 0xef], dtype=np.uint8)
+ testdata = np.packbits(np.concatenate([
+ np.unpackbits(np.arange(0, 10, dtype=np.uint8)),
+ np.random.randint(0, 2, size = 8 * 5), np.unpackbits(pattern),
+ np.random.randint(0, 2, size = 64)
+ ]))
+
+ src = blocks.vector_source_b(testdata)
+ op = xor_frame_sync(pattern, 2048)
+ dst = blocks.vector_sink_b()
+
+ self.tb.connect(src, op, dst)
+ self.tb.run()
+
+ self.assertEqual(op.synchronized, True)
+
+ # FIXME: implement feature
+ # def test_002(self):
+ # """Test a byte unaligned delay"""
+ # pattern = np.array([0xbe, 0xef], dtype=np.uint8)
+ # testdata = np.packbits(np.concatenate([
+ # np.unpackbits(np.arange(0, 10, dtype=np.uint8)),
+ # np.random.randint(0, 2, size = (2 + 8 * 5)), np.unpackbits(pattern),
+ # np.random.randint(0, 2, size = 64)
+ # ]))
+
+ # src = blocks.vector_source_b(testdata)
+ # op = xor_frame_sync(pattern, 2048)
+ # dst = blocks.vector_sink_b()
+
+ # self.tb.connect(src, op, dst)
+ # self.tb.run()
+
+ # self.assertEqual(op.synchronized, True)
+
+
+if __name__ == "__main__":
+ gr_unittest.run(test_xor_frame_sync)
diff --git a/src/gr-fadingui/python/xor_frame_sync.py b/src/gr-fadingui/python/xor_frame_sync.py
index 51af35a..e52b493 100644
--- a/src/gr-fadingui/python/xor_frame_sync.py
+++ b/src/gr-fadingui/python/xor_frame_sync.py
@@ -25,23 +25,24 @@ class xor_frame_sync(gr.sync_block):
out_sig=[np.byte])
# binary pattern to match
- self.pattern = np.unpackbits(np.array(sync_pattern, dtype=np.uint8))[::-1]
- self.nbytes = len(sync_pattern)
- self.nbits = len(self.pattern)
+ self.pattern = sync_pattern
+ self.nbytes = len(self.pattern)
- log.debug(f"Loaded pattern {self.pattern} length={self.nbits}")
+ self.pattern_bits = np.unpackbits(np.array(self.pattern, dtype=np.uint8))[::-1]
+ self.nbits = len(self.pattern_bits)
+
+ log.debug(f"Loaded pattern {self.pattern_bits} length={self.nbits}")
assert(self.nbits % 8 == 0)
# packed buffer to delay the data
self.delaybuf = RingBuffer(buffer_size, dtype=np.uint8)
self.delay = 0
- # unpacked buffer to compute correlation values, initially filled with zeros
- self.corrbuf = RingBuffer(self.nbits)
- self.corrbuf.extend(np.zeros(self.nbits))
+ log.debug(f"Created delay ring buffer of size {self.delaybuf.maxlen}")
- # buffer to store correlation values
- self.xcorrs = RingBuffer(buffer_size)
+ # unpacked buffer to compute correlation values, initially filled with zeros
+ self.corrbuf = RingBuffer(self.nbits, dtype=np.uint8)
+ self.corrbuf.extend(np.zeros(self.corrbuf.maxlen))
# synchronization state
self.synchronized = False
@@ -53,11 +54,21 @@ class xor_frame_sync(gr.sync_block):
Binary correlation between two bit vectors is just size of the
vector(s) minus the number of bits that differ.
+
+ @return: Number of bits of v that were shifted into the buffer
+ when the correlation matched. If no match is found
+ the return value is None.
"""
- v_arr = np.array(v, dtype=np.uint8)
- for b in np.unpackbits(v_arr):
+ # this could be much faster with shifts, bitwise or and xor
+ # but this should do alright for the moment
+ v_bits = np.unpackbits(np.array(v, dtype=np.uint8))
+ for bitnr, b in enumerate(v_bits):
self.corrbuf.appendleft(b)
- yield self.nbits - np.sum(np.logical_xor(self.corrbuf, self.pattern))
+ if (np.bitwise_xor(self.corrbuf, self.pattern_bits) == 0).all():
+ return bitnr
+
+ # no cross correlation found
+ return None
def work(self, input_items, output_items):
"""
@@ -68,35 +79,59 @@ class xor_frame_sync(gr.sync_block):
- If the buffer is not synchronized, compute a binary cross
correlation to find how much the stream should be delayed.
-
- Notes:
-
- - Even though the block input is of type np.byte, inp is an array
- of 255 bytes, probably for performance reasons.
- TODO: block processing
"""
inp = input_items[0]
out = output_items[0]
- if not self.synchronized:
- for v in inp:
- # compute the cross correlation
- xcs = self.xcorrelation(v)
+ inp_len = len(inp)
- # add cross correlations to buffer and save value
- self.xcorrs.extend(list(xcs))
- self.delaybuf.appendleft(v)
+ if not self.synchronized:
+ if inp_len > self.delaybuf.maxlen:
+ log.error("Input is bigger than delay buffer")
- peak = np.argmax(self.xcorrs)
- if self.xcorrs[peak] == self.nbits:
- self.delay = peak
- self.synchronized = True
- log.debug(f"Synchronized with delay={peak}")
+ # FIXME: Makes the QA hang for some reason
+ # raise NotImplemented
- else:
- self.synchronized = False
- log.warning(f"Did not find a peak (max={self.xcorrs[peak]}, should be {self.nbits})")
+ for bytenr, value in enumerate(inp):
+ # save value in the buffer
+ self.delaybuf.appendleft(value)
+ # compute the cross correlation
+ bitnr = self.xcorrelation(value)
+ if bitnr is not None:
+ # correlation was found
+ delay_bits = 8 * bytenr + bitnr
+
+ # FIXME: add bit delay
+ self.delay = bytenr
+ self.synchronized = True
+ log.debug(f"Synchronized with delay={self.delay} delay_bits={delay_bits}")
+
+ # Not aligned to bytes
+ if bitnr != 7:
+ log.error("Not implemented: byte unaligned delay")
+ self.synchronized = False
+ self.delay = 0
+
+ # FIXME: Makes the QA hang for some reason
+ # raise NotImplemented
+
+ # bigger than buffer
+ if bytenr > self.delaybuf.maxlen:
+ log.error("Too too long to synchronize, ran out of buffer memory")
+ self.synchronized = False
+ self.delay = 0
+
+ # FIXME: Makes the QA hang for some reason
+ # raise NotImplemented
+
+ # stop processing inputs
+ break
+
+ if not self.synchronized:
+ log.warning(f"Processed {inp_len} samples but could not synchronize")
+ else:
+ self.delaybuf.extendleft(inp)
# return data with delay
out[:] = self.delaybuf[self.delay]