)
set(sigrok-qt2_TEST_SOURCES
+ test/logicdatasnapshot.cpp
test/test.cpp
datasnapshot.cpp
logicdatasnapshot.cpp
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
-#include "logicdatasnapshot.h"
+#include "extdef.h"
#include <assert.h>
+#include <string.h>
+#include <math.h>
+
+#include <boost/foreach.hpp>
+
+#include "logicdatasnapshot.h"
using namespace std;
+const int LogicDataSnapshot::MipMapScalePower = 4;
+const int LogicDataSnapshot::MipMapScaleFactor = 1 << MipMapScalePower;
+const uint64_t LogicDataSnapshot::MipMapDataUnit = 64*1024; // bytes
+
LogicDataSnapshot::LogicDataSnapshot(
const sr_datafeed_logic &logic) :
- DataSnapshot(logic.unitsize)
+ DataSnapshot(logic.unitsize),
+ _last_append_sample(0)
{
+ memset(_mip_map, 0, sizeof(_mip_map));
append_payload(logic);
}
+LogicDataSnapshot::~LogicDataSnapshot()
+{
+ BOOST_FOREACH(MipMapLevel &l, _mip_map)
+ free(l.data);
+}
+
void LogicDataSnapshot::append_payload(
const sr_datafeed_logic &logic)
{
assert(_unit_size == logic.unitsize);
+ const uint64_t prev_length = _data_length;
append_data(logic.data, logic.length);
+
+ // Generate the first mip-map from the data
+ append_payload_to_mipmap();
+}
+
+void LogicDataSnapshot::reallocate_mip_map(MipMapLevel &m)
+{
+ const uint64_t new_data_length = ((m.length + MipMapDataUnit - 1) /
+ MipMapDataUnit) * MipMapDataUnit;
+ if(new_data_length > m.data_length)
+ {
+ m.data_length = new_data_length;
+ m.data = realloc(m.data, new_data_length * _unit_size);
+ }
+}
+
+void LogicDataSnapshot::append_payload_to_mipmap()
+{
+ MipMapLevel &m0 = _mip_map[0];
+ uint64_t prev_length;
+ const uint8_t *src_ptr;
+ uint8_t *dest_ptr;
+ uint64_t accumulator;
+ unsigned int diff_counter;
+
+ // Expand the data buffer to fit the new samples
+ prev_length = m0.length;
+ m0.length = _data_length / MipMapScaleFactor;
+
+ // Break off if there are no new samples to compute
+ if(m0.length == prev_length)
+ return;
+
+ reallocate_mip_map(m0);
+
+ dest_ptr = (uint8_t*)m0.data + prev_length * _unit_size;
+
+ // Iterate through the samples to populate the first level mipmap
+ accumulator = 0;
+ diff_counter = MipMapScaleFactor;
+ const uint8_t *end_src_ptr = (uint8_t*)_data +
+ m0.length * _unit_size * MipMapScaleFactor;
+ for(src_ptr = (uint8_t*)_data +
+ prev_length * _unit_size * MipMapScaleFactor;
+ src_ptr < end_src_ptr;)
+ {
+ // Accumulate transitions which have occurred in this sample
+ accumulator = 0;
+ diff_counter = MipMapScaleFactor;
+ while(diff_counter-- > 0)
+ {
+ const uint64_t sample = *(uint64_t*)src_ptr;
+ accumulator |= _last_append_sample ^ sample;
+ _last_append_sample = sample;
+ src_ptr += _unit_size;
+ }
+
+ *(uint64_t*)dest_ptr = accumulator;
+ dest_ptr += _unit_size;
+ }
+
+ // Compute higher level mipmaps
+ for(int level = 1; level < ScaleStepCount; level++)
+ {
+ MipMapLevel &m = _mip_map[level];
+ const MipMapLevel &ml = _mip_map[level-1];
+
+ // Expand the data buffer to fit the new samples
+ prev_length = m.length;
+ m.length = ml.length / MipMapScaleFactor;
+
+ // Break off if there are no more samples to computed
+ if(m.length == prev_length)
+ break;
+
+ reallocate_mip_map(m);
+
+ // Subsample the level lower level
+ src_ptr = (uint8_t*)ml.data +
+ _unit_size * prev_length * MipMapScaleFactor;
+ const uint8_t *end_dest_ptr =
+ (uint8_t*)m.data + _unit_size * m.length;
+ for(dest_ptr = (uint8_t*)m.data +
+ _unit_size * prev_length;
+ dest_ptr < end_dest_ptr;
+ dest_ptr += _unit_size)
+ {
+ accumulator = 0;
+ diff_counter = MipMapScaleFactor;
+ while(diff_counter-- > 0)
+ {
+ accumulator |= *(uint64_t*)src_ptr;
+ src_ptr += _unit_size;
+ }
+
+ *(uint64_t*)dest_ptr = accumulator;
+ }
+ }
}
uint64_t LogicDataSnapshot::get_sample(uint64_t index) const
class LogicDataSnapshot : public DataSnapshot
{
+private:
+ struct MipMapLevel
+ {
+ uint64_t length;
+ uint64_t data_length;
+ void *data;
+ };
+
+private:
+ static const int ScaleStepCount = 10;
+ static const int MipMapScalePower;
+ static const int MipMapScaleFactor;
+ static const uint64_t MipMapDataUnit;
+
public:
typedef std::pair<int64_t, bool> EdgePair;
public:
LogicDataSnapshot(const sr_datafeed_logic &logic);
+ virtual ~LogicDataSnapshot();
+
void append_payload(const sr_datafeed_logic &logic);
+private:
+ void reallocate_mip_map(MipMapLevel &m);
+
+ void append_payload_to_mipmap();
+
+public:
uint64_t get_sample(uint64_t index) const;
/**
void get_subsampled_edges(std::vector<EdgePair> &edges,
int64_t start, int64_t end,
int64_t quantization_length, int sig_index);
+
+private:
+ struct MipMapLevel _mip_map[ScaleStepCount];
+ uint64_t _last_append_sample;
+
+ friend class LogicDataSnapshotTest;
};
--- /dev/null
+/*
+ * This file is part of the sigrok project.
+ *
+ * Copyright (C) 2012 Joel Holdsworth <joel@airwebreathe.org.uk>
+ *
+ * This program 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 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <boost/test/unit_test.hpp>
+
+#include "../logicdatasnapshot.h"
+
+void push_logic(LogicDataSnapshot &s, unsigned int length, uint8_t value)
+{
+ sr_datafeed_logic logic;
+ logic.unitsize = 1;
+ logic.length = length;
+ logic.data = new uint8_t[length];
+ memset(logic.data, value, length * logic.unitsize);
+ s.append_payload(logic);
+ delete[] (uint8_t*)logic.data;
+}
+
+BOOST_AUTO_TEST_CASE(LogicDataSnapshotTest)
+{
+ // Create an empty LogicDataSnapshot object
+ sr_datafeed_logic logic;
+ logic.length = 0;
+ logic.unitsize = 1;
+ logic.data = NULL;
+
+ LogicDataSnapshot s(logic);
+
+ BOOST_CHECK(s.get_sample_count() == 0);
+ for(int i = 0; i < LogicDataSnapshot::ScaleStepCount; i++)
+ {
+ const LogicDataSnapshot::MipMapLevel &m = s._mip_map[i];
+ BOOST_CHECK_EQUAL(m.length, 0);
+ BOOST_CHECK_EQUAL(m.data_length, 0);
+ BOOST_CHECK(m.data == NULL);
+ }
+
+ // Push 8 samples of all zeros
+ push_logic(s, 8, 0);
+
+ BOOST_CHECK(s.get_sample_count() == 8);
+
+ // There should not be enough samples to have a single mip map sample
+ for(int i = 0; i < LogicDataSnapshot::ScaleStepCount; i++)
+ {
+ const LogicDataSnapshot::MipMapLevel &m = s._mip_map[i];
+ BOOST_CHECK_EQUAL(m.length, 0);
+ BOOST_CHECK_EQUAL(m.data_length, 0);
+ BOOST_CHECK(m.data == NULL);
+ }
+
+ // Push 8 samples of 0x11s to bring the total up to 16
+ push_logic(s, 8, 0x11);
+
+ // There should now be enough data for exactly one sample
+ // in mip map level 0, and that sample should be 0
+ const LogicDataSnapshot::MipMapLevel &m0 = s._mip_map[0];
+ BOOST_CHECK_EQUAL(m0.length, 1);
+ BOOST_CHECK_EQUAL(m0.data_length, LogicDataSnapshot::MipMapDataUnit);
+ BOOST_REQUIRE(m0.data != NULL);
+ BOOST_CHECK_EQUAL(((uint8_t*)m0.data)[0], 0x11);
+
+ // The higher levels should still be empty
+ for(int i = 1; i < LogicDataSnapshot::ScaleStepCount; i++)
+ {
+ const LogicDataSnapshot::MipMapLevel &m = s._mip_map[i];
+ BOOST_CHECK_EQUAL(m.length, 0);
+ BOOST_CHECK_EQUAL(m.data_length, 0);
+ BOOST_CHECK(m.data == NULL);
+ }
+
+ // Push 240 samples of all zeros to bring the total up to 256
+ push_logic(s, 240, 0);
+
+ BOOST_CHECK_EQUAL(m0.length, 16);
+ BOOST_CHECK_EQUAL(m0.data_length, LogicDataSnapshot::MipMapDataUnit);
+
+ BOOST_CHECK_EQUAL(((uint8_t*)m0.data)[1], 0x11);
+ for(int i = 2; i < m0.length; i++)
+ BOOST_CHECK_EQUAL(((uint8_t*)m0.data)[i], 0);
+
+ const LogicDataSnapshot::MipMapLevel &m1 = s._mip_map[1];
+ BOOST_CHECK_EQUAL(m1.length, 1);
+ BOOST_CHECK_EQUAL(m1.data_length, LogicDataSnapshot::MipMapDataUnit);
+ BOOST_REQUIRE(m1.data != NULL);
+ BOOST_CHECK_EQUAL(((uint8_t*)m1.data)[0], 0x11);
+}
#define BOOST_TEST_MAIN
#include <boost/test/unit_test.hpp>
-
-#include "../logicdatasnapshot.h"
-
-BOOST_AUTO_TEST_CASE(LogicDataSnapshotTest)
-{
- // Create an empty LogicDataSnapshot object
- sr_datafeed_logic logic;
- logic.length = 0;
- logic.unitsize = 1;
- logic.data = NULL;
-
- LogicDataSnapshot s(logic);
-
- BOOST_CHECK(s.get_sample_count() == 0);
-}
projects / pulseview.git / commitdiff