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Merged
cfillion merged 1 commit into from
Dec 7, 2025
Merged

Update MIDI Multi Channel Pre-Delay v0.7 > v0.8 #435

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92 changes: 69 additions & 23 deletions MIDI/talagan_MIDI Multi Channel Pre-Delay Live Flagger.jsfx
100644 → 100755
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,10 +1,12 @@
noindex: true
desc: MIDI Multi Channel Pre-Delay Live Flagger
version: 0.7
version: 0.8
author: Ben 'Talagan' Babut

options:gmem=MIDIMultiChannelPredelay
slider1:introduced_lag=0<0,1000>Introduced Lag
slider2:queue_size=0<0,1000>Queue Size

options:gmem=MIDIMultiChannelPredelay

// This plugin flags live events in GMEM so that another plugin in the normal FX Chain
// can check if incoming MIDI Events are live events or not.
Expand Down Expand Up @@ -32,12 +34,14 @@ g_last_play_state = play_state;

MAGIC_NUMBER = 0xF5AF5BB0;

EVENT_START_ADDR = 0;
EVENT_START_ADDR = 1;
STORED_EVENT_SIZE = 6;

g_block_num = 0;
b_now = 0;
b_cursor = 0;

introduced_lag = 0;
queue_size = 0;

@block

Expand All @@ -47,6 +51,38 @@ function getUID()
get_host_placement(cp, flags);
);

function gmem_p()
local(res)
(
res = atomic_setifequal(gmem[0], 0, 1);
(res == 0);
);

function gmem_v()
(
atomic_set(gmem[0],0);
);

function gmem_wait(timeout)
local(t1, t2, elapsed)
(
(timeout <=0)?(timeout = 1.0);

t1 = time_precise();
elapsed = 0;
should_loop = 1;

while(!gmem_p() && should_loop == 1)
(
t2 = time_precise();
elapsed = (t2 - t1);
should_loop = (elapsed < timeout);
);

introduced_lag += elapsed;
should_loop;
);

function slotIsReusable(slot_address)
local(mg, st, id, ts, bn)
(
Expand All @@ -60,19 +96,35 @@ function slotIsReusable(slot_address)
(ts + 0.1 < b_now); // Too old, obsolete, probably a leftover of another plugin
);


function findFirstReusableSlot()
local(c)
(
c = EVENT_START_ADDR;
while(!slotIsReusable(c)) (
c += STORED_EVENT_SIZE;
);
c;
);

function cleanupMemory()
local(last)
local(last, c, bn, id)
(
last = b_cursor;
gmem_wait(0.01);

c = EVENT_START_ADDR;
last = EVENT_START_ADDR;

// Advance till we meet something which is not a slot
while(gmem[b_cursor] == MAGIC_NUMBER) (
last = b_cursor;
b_cursor += STORED_EVENT_SIZE;
while(gmem[c] == MAGIC_NUMBER) (
last = c;
c += STORED_EVENT_SIZE;
);

queue_size = c - EVENT_START_ADDR;

// Now rewind-erase the end of the queue
while(slotIsReusable(last) && (last >= 0)) (
while(slotIsReusable(last) && (last >= EVENT_START_ADDR)) (
gmem[last] = 0;
gmem[last+1] = 0;
gmem[last+2] = 0;
Expand All @@ -83,7 +135,7 @@ function cleanupMemory()
);

// Only invalidate events in the rest of the queue if they belong to us and are not valid anymore.
while(last >= 0) (
while(last >= EVENT_START_ADDR) (

id = gmem[last+1];
bn = gmem[last+3];
Expand All @@ -93,23 +145,17 @@ function cleanupMemory()
);
last -= STORED_EVENT_SIZE;
);
);

function findNextFreeSlotAddress()
local()
(
while(!slotIsReusable(b_cursor)) (
b_cursor += STORED_EVENT_SIZE;
);

b_cursor;
gmem_v();
);

function flagEvent(offset, msg1, msg2, msg3)
local(slot_address)
(
gmem_wait(0.01);

// Calculate address to store next event
slot_address = findNextFreeSlotAddress();
slot_address = findFirstReusableSlot();

// Store UID / Offsetof the event at this address
gmem[slot_address] = MAGIC_NUMBER;
Expand All @@ -118,8 +164,9 @@ function flagEvent(offset, msg1, msg2, msg3)
gmem[slot_address+3] = g_block_num;
gmem[slot_address+4] = (msg1 << 16) | (msg2 << 8) | msg3;
gmem[slot_address+5] = offset;
);

gmem_v();
);

function receiveEvents()
local(offset,msg1,msg2,msg3)
Expand All @@ -137,7 +184,6 @@ function receiveEvents()
//----------------------

b_now = time_precise();
b_cursor = 0;

// Resync the counter on play changes

Expand Down
7 changes: 4 additions & 3 deletions MIDI/talagan_MIDI Multi Channel Pre-Delay.jsfx
100644 → 100755
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,12 +1,12 @@
desc:MIDI Multi Channel Pre-Delay
author: Ben 'Talagan' Babut
version: 0.7
version: 0.8
donation:
https://www.paypal.com/donate/?business=3YEZMY9D6U8NC&no_recurring=1&currency_code=EUR
license:
MIT (Do whatever you like with this code).
changelog:
- [Bug Fix] Live Flagger cleanup was not invalidating all obsolete events if multiple instances were active
- [Bug Fix] Fixing gmem multi-thread concurrency problem under windows (now using critical section)
provides:
talagan_MIDI Multi Channel Pre-Delay Live Flagger.jsfx
about:
Expand Down Expand Up @@ -99,6 +99,7 @@ MAX_RAM = __memtop(); // This is big... maybe we should calm it down

MAGIC_NUMBER = 0xF5AF5BB0;
STORED_EVENT_SIZE = 6;
EVENT_START_ADDRESS = 1;

// The script uses a rolling buffer.
g_buf_l = 0;
Expand Down Expand Up @@ -167,7 +168,7 @@ function getUID()
function isLiveEvent(offset, msg1, msg2, msg3)
local(cursor, found, _msg, _msg1, _msg2, _msg3)
(
cursor = 0;
cursor = EVENT_START_ADDRESS;
found = 0;

while( (gmem[cursor] == MAGIC_NUMBER) && !found) (
Expand Down