source/libjack/libjack_time.cpp

   1 /*
   2  * Carla JACK API for external applications
   3  * Copyright (C) 2016-2022 Filipe Coelho <falktx@falktx.com>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation; either version 2 of
   8  * the License, or any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * For a full copy of the GNU General Public License see the doc/GPL.txt file.
  16  */
  17
  18 #include "libjack.hpp"
  19
  20 CARLA_BACKEND_USE_NAMESPACE
  21
  22 // --------------------------------------------------------------------------------------------------------------------
  23
  24 CARLA_PLUGIN_EXPORT
  25 jack_nframes_t jack_frames_since_cycle_start(const jack_client_t* client)
  26 {
  27     const JackClientState* const jclient = (const JackClientState*)client;
  28     CARLA_SAFE_ASSERT_RETURN(jclient != nullptr, 0);
  29
  30     // TODO
  31     return 0;
  32 }
  33
  34 CARLA_PLUGIN_EXPORT
  35 jack_nframes_t jack_frame_time(const jack_client_t* client)
  36 {
  37     const JackClientState* const jclient = (const JackClientState*)client;
  38     CARLA_SAFE_ASSERT_RETURN(jclient != nullptr, 0);
  39
  40     // FIXME this is wrong
  41     return static_cast<jack_nframes_t>(jclient->server.position.usecs);
  42 }
  43
  44 CARLA_PLUGIN_EXPORT
  45 jack_nframes_t jack_last_frame_time(const jack_client_t* client)
  46 {
  47     const JackClientState* const jclient = (const JackClientState*)client;
  48     CARLA_SAFE_ASSERT_RETURN(jclient != nullptr, 0);
  49
  50     return static_cast<jack_nframes_t>(jclient->server.monotonic_frame);
  51 }
  52
  53 CARLA_PLUGIN_EXPORT
  54 int jack_get_cycle_times(const jack_client_t *client,
  55                          jack_nframes_t *current_frames,
  56                          jack_time_t    *current_usecs,
  57                          jack_time_t    *next_usecs,
  58                          float          *period_usecs)
  59 {
  60     const JackClientState* const jclient = (const JackClientState*)client;
  61     CARLA_SAFE_ASSERT_RETURN(jclient != nullptr, 1);
  62
  63     /* current_frames: the frame time counter at the start of the current cycle, same as jack_last_frame_time().
  64      * current_usecs:  the microseconds time at the start of the current cycle.
  65      * next_usecs:     the microseconds time of the start of the next next cycle as computed by the DLL.
  66      * period_usecs:   the current best estimate of the period time in microseconds.
  67      */
  68     const double _period_usecs = static_cast<double>(jclient->server.bufferSize) / jclient->server.sampleRate;
  69
  70     *current_frames = jclient->server.monotonic_frame;
  71     *current_usecs = jclient->server.position.usecs;
  72     *next_usecs = jclient->server.position.usecs + static_cast<jack_time_t>(_period_usecs + 0.5);
  73     *period_usecs = static_cast<float>(_period_usecs);
  74     return 0;
  75 }
  76
  77 // --------------------------------------------------------------------------------------------------------------------
  78
  79 CARLA_PLUGIN_EXPORT
  80 jack_time_t jack_frames_to_time(const jack_client_t* client, jack_nframes_t frames)
  81 {
  82     const JackClientState* const jclient = (const JackClientState*)client;
  83     CARLA_SAFE_ASSERT_RETURN(jclient != nullptr, 0);
  84
  85     return static_cast<jack_time_t>(static_cast<double>(frames) / jclient->server.sampleRate * 1000000.0);
  86 }
  87
  88 CARLA_PLUGIN_EXPORT
  89 jack_nframes_t jack_time_to_frames(const jack_client_t* client, jack_time_t time)
  90 {
  91     const JackClientState* const jclient = (const JackClientState*)client;
  92     CARLA_SAFE_ASSERT_RETURN(jclient != nullptr, 0);
  93
  94     return static_cast<jack_nframes_t>(static_cast<double>(time) / 1000000.0 * jclient->server.sampleRate);
  95 }
  96
  97 CARLA_PLUGIN_EXPORT
  98 jack_time_t jack_get_time(void)
  99 {
 100     timespec t;
 101 #ifdef CLOCK_MONOTONIC_RAW
 102     clock_gettime(CLOCK_MONOTONIC_RAW, &t);
 103 #else
 104     clock_gettime(CLOCK_MONOTONIC, &t);
 105 #endif
 106     return static_cast<jack_time_t>(t.tv_sec * 1000000 + t.tv_nsec / 1000);
 107 }
 108
 109 // --------------------------------------------------------------------------------------------------------------------