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Add a Clock for Linux platform

ALSA drivers provide the playback time of one sample using the
REALTIME_CLOCK referencial. So Link should use it as well.
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abique committed Feb 2, 2017
1 parent 35b403a commit 3113fd732da65d9f8eb34c6465988ea8bfbe4f57
Showing with 75 additions and 2 deletions.
  1. +1 −0 include/CMakeLists.txt
  2. +2 −2 include/ableton/platforms/Config.hpp
  3. +72 −0 include/ableton/platforms/linux/Clock.hpp
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@@ -95,6 +95,7 @@ if(UNIX)
set(link_platform_HEADERS
${link_platform_HEADERS}
${link_platform_DIR}/linux/Linux.hpp
${link_platform_DIR}/linux/Clock.hpp
${link_platform_DIR}/stl/Clock.hpp
)
endif()
@@ -32,8 +32,8 @@
#include <ableton/platforms/posix/ScanIpIfAddrs.hpp>
#elif LINK_PLATFORM_LINUX
#include <ableton/platforms/asio/Context.hpp>
#include <ableton/platforms/linux/Clock.hpp>
#include <ableton/platforms/posix/ScanIpIfAddrs.hpp>
#include <ableton/platforms/stl/Clock.hpp>
#endif
namespace ableton
@@ -54,7 +54,7 @@ using IoContext =
platforms::asio::Context<platforms::posix::ScanIpIfAddrs, util::NullLog>;
#elif LINK_PLATFORM_LINUX
using Clock = platforms::stl::Clock;
using Clock = platforms::linux::ClockMonotonic;
using IoContext =
platforms::asio::Context<platforms::posix::ScanIpIfAddrs, util::NullLog>;
#endif
@@ -0,0 +1,72 @@
/* Copyright 2016, Ableton AG, Berlin. All rights reserved.
*
* 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, see <http://www.gnu.org/licenses/>.
*
* If you would like to incorporate Link into a proprietary software application,
* please contact <link-devs@ableton.com>.
*/
#pragma once
#include <chrono>
#include <cmath>
#include <ctime>
namespace ableton
{
namespace platforms
{
#ifdef linux
#undef linux
#endif
namespace linux
{
template <clockid_t CLOCK>
struct Clock
{
using Ticks = std::uint64_t;
using Micros = std::chrono::microseconds;
Micros ticksToMicros(const Ticks ticks) const
{
return Micros(ticks / 1000ULL);
}
Ticks microsToTicks(const Micros micros) const
{
return micros.count() * 1000ULL;
}
Ticks ticks() const
{
::timespec ts;
::clock_gettime(CLOCK, &ts);
return ts.tv_sec * 1000000000ULL + ts.tv_nsec;
}
std::chrono::microseconds micros() const
{
return ticksToMicros(ticks());
}
};
using ClockRealtime = Clock<CLOCK_REALTIME>;
using ClockMonotonic = Clock<CLOCK_MONOTONIC>;
} // namespace linux
} // namespace platforms
} // namespace ableton

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