gras: first cut at time tag class

2 files changed, 90 insertions, 0 deletions

diff --git a/lib/CMakeLists.txt b/lib/CMakeLists.txt
index 44b3012..ab5d886 100644
--- a/lib/CMakeLists.txt
+++ b/lib/CMakeLists.txt
@@ -48,6 +48,7 @@ list(APPEND GRAS_SOURCES
     ${CMAKE_CURRENT_SOURCE_DIR}/buffer_queue_circ.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/buffer_queue_pool.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/tags.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/time_tag.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/block.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/block_config.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/block_message.cpp
diff --git a/lib/time_tag.cpp b/lib/time_tag.cpp
new file mode 100644
index 0000000..d438fc3
--- /dev/null
+++ b/lib/time_tag.cpp
@@ -0,0 +1,89 @@
+// Copyright (C) by Josh Blum. See LICENSE.txt for licensing information.
+
+#include <gras/time_tag.hpp>
+#include <PMC/Containers.hpp>
+#include <boost/cstdint.hpp> //uint64
+#include <boost/math/special_functions/round.hpp>
+
+using namespace gras;
+
+static TimeTag &normalize(TimeTag &t)
+{
+    int num = int(t._ticks/time_tps());
+    if (num < 0) num--; //stops negative ticks
+    t._fsecs += num;
+    t._ticks -= num*time_tps();
+    return t;
+}
+
+TimeTag::TimeTag(void):
+    _fsecs(0), _ticks(0)
+{/*NOP*/}
+
+TimeTag TimeTag::from_ticks(const time_ticks_t ticks)
+{
+    TimeTag t;
+    t._ticks = ticks;
+    return normalize(t);
+}
+
+TimeTag TimeTag::from_ticks(const time_ticks_t ticks, const double rate)
+{
+    TimeTag t;
+    t._fsecs = time_ticks_t(ticks/rate);
+    const double error = ticks - (t._fsecs*rate);
+    t._ticks = boost::math::llround((error*time_tps())/rate);
+    return normalize(t);
+}
+
+TimeTag TimeTag::from_pmc(const PMCC &p)
+{
+    TimeTag t;
+    const PMCTuple<2> &tuple = p.as<PMCTuple<2> >();
+    t._fsecs = tuple[0].as<boost::uint64_t>();
+    t._ticks = boost::math::llround(tuple[1].as<double>()*time_tps());
+    return normalize(t);
+}
+
+time_ticks_t TimeTag::to_ticks(void)
+{
+    return _fsecs*time_tps() + _ticks;
+}
+
+time_ticks_t TimeTag::to_ticks(const double rate)
+{
+    return _fsecs*time_tps() + boost::math::llround((_ticks*rate)/time_tps());
+}
+
+PMCC TimeTag::to_pmc(void)
+{
+    PMCTuple<2> tuple;
+    tuple[0] = PMC_M<boost::uint64_t>(_fsecs);
+    tuple[1] = PMC_M<double>(_ticks/double(time_tps()));
+    return PMC_M(tuple);
+}
+
+TimeTag &TimeTag::operator+=(const TimeTag &rhs)
+{
+    _fsecs += rhs._fsecs;
+    _ticks += rhs._ticks;
+    return normalize(*this);
+}
+
+TimeTag &TimeTag::operator-=(const TimeTag &rhs)
+{
+    _fsecs -= rhs._fsecs;
+    _ticks -= rhs._ticks;
+    return normalize(*this);
+}
+
+bool gras::operator<(const TimeTag &lhs, const TimeTag &rhs)
+{
+    if (lhs._fsecs == rhs._fsecs) return lhs._ticks < rhs._ticks;
+    return lhs._fsecs < rhs._fsecs;
+}
+
+bool gras::operator==(const TimeTag &lhs, const TimeTag &rhs)
+{
+    return (lhs._fsecs == rhs._fsecs) and (lhs._ticks == rhs._ticks);
+}