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livetrax/libs/midi++2/mtc.cc
David Robillard e0aaed6d65 *** NEW CODING POLICY *** 
All #include statements that include a header that is a part of a library
bundled with ardour MUST use quotes, not angle brackets.

Do this:

#include "ardour/types.h"

NOT this:

#include <ardour/types.h>

Rationale:

This is best practice in general, to ensure we include the local version
and not the system version.  That quotes mean "local" (in some sense)
and angle brackets mean "system" (in some sense) is a ubiquitous
convention and IIRC right in the C spec somewhere.

More pragmatically, this is required by (my) waf (stuff) for dependencies
to work correctly.  That is:

!!! FAILURE TO DO THIS CAN RESULT IN BROKEN BUILDS !!!

Failure to comply is punishable by death by torture. :)

P.S. It's not that dramatic in all cases, but this (in combination with some
GCC flags specific to the include type) is the best way I have found to be
absolutely 100% positive the local ones are being used (and we definitely
want to be absolutely 100% positive on that one).


git-svn-id: svn://localhost/ardour2/branches/3.0@4655 d708f5d6-7413-0410-9779-e7cbd77b26cf
2009-02-25 18:26:51 +00:00

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/*
Copyright (C) 2004 Paul Barton-Davis
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., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id$
*/
#include <cstdlib>
#include <unistd.h>
#include <cstring>
#include <iostream>
#include "midi++/types.h"
#include "midi++/parser.h"
#include "midi++/port.h"
#include "midi++/mmc.h"
#include "pbd/transmitter.h"
using namespace std;
using namespace sigc;
using namespace MIDI;
bool
Parser::possible_mtc (byte *sysex_buf, size_t msglen)
{
byte fake_mtc_time[5];
if (msglen != 10 || sysex_buf[0] != 0xf0 || sysex_buf[1] != 0x7f || sysex_buf[3] != 0x01 || sysex_buf[4] != 0x01) {
return false;
}
/* full MTC */
fake_mtc_time[0] = sysex_buf[8]; // frames
fake_mtc_time[1] = sysex_buf[7]; // minutes
fake_mtc_time[2] = sysex_buf[6]; // seconds
fake_mtc_time[3] = (sysex_buf[5] & 0x1f); // hours
_mtc_fps = MTC_FPS ((sysex_buf[5] & 0x60) >> 5); // fps
fake_mtc_time[4] = (byte) _mtc_fps;
/* wait for first quarter frame, which could indicate forwards
or backwards ...
*/
reset_mtc_state ();
/* emit signals */
mtc (*this, &sysex_buf[1], msglen - 1);
mtc_time (fake_mtc_time, true);
mtc_status (MTC_Stopped);
return true;
}
void
Parser::reset_mtc_state ()
{
_mtc_forward = false;
_mtc_running = MTC_Stopped;
_mtc_locked = false;
expected_mtc_quarter_frame_code = 0;
memset (_mtc_time, 0, sizeof (_mtc_time));
memset (_qtr_mtc_time, 0, sizeof (_mtc_time));
consecutive_qtr_frame_cnt = 0;
last_qtr_frame = 0;
}
void
Parser::process_mtc_quarter_frame (byte *msg)
{
int which_quarter_frame = (msg[1] & 0xf0) >> 4;
/* Is it an expected frame?
Remember, the first can be frame 7 or frame 0,
depending on the direction of the MTC generator ...
*/
#if 0
cerr << "MTC: (state = " << _mtc_running << ") "
<< which_quarter_frame << " vs. " << expected_mtc_quarter_frame_code
<< " consecutive ? " << consecutive_qtr_frame_cnt
<< endl;
#endif
if (_mtc_running == MTC_Stopped) {
/* we are stopped but are seeing qtr frame messages */
if (consecutive_qtr_frame_cnt == 0) {
/* first quarter frame */
if (which_quarter_frame != 0 && which_quarter_frame != 7) {
last_qtr_frame = which_quarter_frame;
consecutive_qtr_frame_cnt++;
}
// cerr << "first seen qframe = " << (int) last_qtr_frame << endl;
return;
} else if (consecutive_qtr_frame_cnt == 1) {
/* third quarter frame */
// cerr << "second seen qframe = " << (int) which_quarter_frame << endl;
if (last_qtr_frame < which_quarter_frame) {
_mtc_running = MTC_Forward;
} else if (last_qtr_frame > which_quarter_frame) {
_mtc_running = MTC_Backward;
}
mtc_status (_mtc_running);
}
switch (_mtc_running) {
case MTC_Forward:
if (which_quarter_frame == 7) {
expected_mtc_quarter_frame_code = 0;
} else {
expected_mtc_quarter_frame_code = which_quarter_frame + 1;
}
break;
case MTC_Backward:
if (which_quarter_frame == 0) {
expected_mtc_quarter_frame_code = 7;
} else {
expected_mtc_quarter_frame_code = which_quarter_frame - 1;
}
break;
case MTC_Stopped:
break;
}
} else {
/* already running */
// for testing bad MIDI connections etc.
// if ((random() % 500) < 10) {
if (which_quarter_frame != expected_mtc_quarter_frame_code) {
consecutive_qtr_frame_cnt = 0;
#ifdef DEBUG_MTC
cerr << "MTC: (state = " << _mtc_running << ") "
<< which_quarter_frame << " vs. " << expected_mtc_quarter_frame_code << endl;
#endif
/* tell listener(s) that we skipped. if they return
true, just ignore this in terms of it being an error.
*/
if (1) { /* mtc_skipped () */
/* no error, reset next expected frame */
switch (_mtc_running) {
case MTC_Forward:
if (which_quarter_frame == 7) {
expected_mtc_quarter_frame_code = 0;
} else {
expected_mtc_quarter_frame_code = which_quarter_frame + 1;
}
break;
case MTC_Backward:
if (which_quarter_frame == 0) {
expected_mtc_quarter_frame_code = 7;
} else {
expected_mtc_quarter_frame_code = which_quarter_frame - 1;
}
break;
case MTC_Stopped:
break;
}
#ifdef DEBUG_MTC
cerr << "SKIPPED, next expected = " << expected_mtc_quarter_frame_code << endl;
#endif
return;
}
/* go back to waiting for the first frame */
expected_mtc_quarter_frame_code = 0;
memset (_qtr_mtc_time, 0, sizeof (_qtr_mtc_time));
_mtc_running = MTC_Stopped;
_mtc_locked = false;
mtc_status (MTC_Stopped);
return;
} else {
/* received qtr frame matched expected */
consecutive_qtr_frame_cnt++;
}
}
/* time code is looking good */
switch (which_quarter_frame) {
case 0: // frames LS nibble
_qtr_mtc_time[0] |= msg[1] & 0xf;
break;
case 1: // frames MS nibble
_qtr_mtc_time[0] |= (msg[1] & 0xf)<<4;
break;
case 2: // seconds LS nibble
_qtr_mtc_time[1] |= msg[1] & 0xf;
break;
case 3: // seconds MS nibble
_qtr_mtc_time[1] |= (msg[1] & 0xf)<<4;
break;
case 4: // minutes LS nibble
_qtr_mtc_time[2] |= msg[1] & 0xf;
break;
case 5: // minutes MS nibble
_qtr_mtc_time[2] |= (msg[1] & 0xf)<<4;
break;
case 6: // hours LS nibble
_qtr_mtc_time[3] |= msg[1] & 0xf;
break;
case 7:
/* last quarter frame msg has the MS bit of
the hour in bit 0, and the SMPTE FPS type
in bits 5 and 6
*/
_qtr_mtc_time[3] |= ((msg[1] & 0x1) << 4);
_mtc_fps = MTC_FPS ((msg[1] & 0x6) >> 1);
_qtr_mtc_time[4] = _mtc_fps;
break;
default:
/*NOTREACHED*/
break;
}
mtc_qtr (*this); /* EMIT_SIGNAL */
// mtc (*this, &msg[1], msglen - 1);
switch (_mtc_running) {
case MTC_Forward:
if ((which_quarter_frame == 7)) {
/* we've reached the final of 8 quarter frame messages.
store the time, reset the pending time holder,
and signal anyone who wants to know the time.
*/
if (consecutive_qtr_frame_cnt >= 8) {
memcpy (_mtc_time, _qtr_mtc_time, sizeof (_mtc_time));
memset (_qtr_mtc_time, 0, sizeof (_qtr_mtc_time));
if (!_mtc_locked) {
_mtc_locked = true;
}
mtc_time (_mtc_time, false);
}
expected_mtc_quarter_frame_code = 0;
} else {
expected_mtc_quarter_frame_code = which_quarter_frame + 1;
}
break;
case MTC_Backward:
if (which_quarter_frame == 0) {
/* we've reached the final of 8 quarter frame messages.
store the time, reset the pending time holder,
and signal anyone who wants to know the time.
*/
if (consecutive_qtr_frame_cnt >= 8) {
memcpy (_mtc_time, _qtr_mtc_time, sizeof (_mtc_time));
memset (_qtr_mtc_time, 0, sizeof (_qtr_mtc_time));
if (!_mtc_locked) {
_mtc_locked = true;
}
mtc_time (_mtc_time, false);
}
expected_mtc_quarter_frame_code = 7;
} else {
expected_mtc_quarter_frame_code = which_quarter_frame - 1;
}
break;
default:
break;
}
}
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