Jack2  1.9.8
JackMidiUtil.cpp
00001 /*
00002 Copyright (C) 2010 Devin Anderson
00003 
00004 This program is free software; you can redistribute it and/or modify
00005 it under the terms of the GNU Lesser General Public License as published by
00006 the Free Software Foundation; either version 2.1 of the License, or
00007 (at your option) any later version.
00008 
00009 This program is distributed in the hope that it will be useful,
00010 but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 GNU Lesser General Public License for more details.
00013 
00014 You should have received a copy of the GNU Lesser General Public License
00015 along with this program; if not, write to the Free Software
00016 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
00017 
00018 */
00019 
00020 #include "JackEngineControl.h"
00021 #include "JackFrameTimer.h"
00022 #include "JackGlobals.h"
00023 #include "JackMidiUtil.h"
00024 #include "JackTime.h"
00025 
00026 jack_midi_data_t
00027 Jack::ApplyRunningStatus(size_t *size, jack_midi_data_t **buffer,
00028                          jack_midi_data_t running_status)
00029 {
00030 
00031     // Stolen and modified from alsa/midi_pack.h
00032 
00033     jack_midi_data_t status = **buffer;
00034     if ((status >= 0x80) && (status < 0xf0)) {
00035         if (status == running_status) {
00036             (*buffer)++;
00037             (*size)--;
00038         } else {
00039             running_status = status;
00040         }
00041     } else if (status < 0xf8) {
00042         running_status = 0;
00043     }
00044     return running_status;
00045 }
00046 
00047 jack_midi_data_t
00048 Jack::ApplyRunningStatus(jack_midi_event_t *event,
00049                          jack_midi_data_t running_status)
00050 {
00051     return ApplyRunningStatus(&(event->size), &(event->buffer),
00052                               running_status);
00053 }
00054 
00055 jack_nframes_t
00056 Jack::GetCurrentFrame()
00057 {
00058     jack_time_t time = GetMicroSeconds();
00059     JackEngineControl *control = GetEngineControl();
00060     JackTimer timer;
00061     control->ReadFrameTime(&timer);
00062     return timer.Time2Frames(time, control->fBufferSize);
00063 }
00064 
00065 jack_nframes_t
00066 Jack::GetFramesFromTime(jack_time_t time)
00067 {
00068     JackEngineControl* control = GetEngineControl();
00069     JackTimer timer;
00070     control->ReadFrameTime(&timer);
00071     return timer.Time2Frames(time, control->fBufferSize);
00072 }
00073 
00074 jack_nframes_t
00075 Jack::GetLastFrame()
00076 {
00077     return GetEngineControl()->fFrameTimer.ReadCurrentState()->CurFrame();
00078 }
00079 
00080 int
00081 Jack::GetMessageLength(jack_midi_data_t status_byte)
00082 {
00083     switch (status_byte & 0xf0) {
00084     case 0x80:
00085     case 0x90:
00086     case 0xa0:
00087     case 0xb0:
00088     case 0xe0:
00089         return 3;
00090     case 0xc0:
00091     case 0xd0:
00092         return 2;
00093     case 0xf0:
00094         switch (status_byte) {
00095         case 0xf0:
00096             return 0;
00097         case 0xf1:
00098         case 0xf3:
00099             return 2;
00100         case 0xf2:
00101             return 3;
00102         case 0xf4:
00103         case 0xf5:
00104         case 0xf7:
00105         case 0xfd:
00106             break;
00107         default:
00108             return 1;
00109         }
00110     }
00111     return -1;
00112 }
00113 
00114 jack_time_t
00115 Jack::GetTimeFromFrames(jack_nframes_t frames)
00116 {
00117     JackEngineControl* control = GetEngineControl();
00118     JackTimer timer;
00119     control->ReadFrameTime(&timer);
00120     return timer.Frames2Time(frames, control->fBufferSize);
00121 }