mirrors
/
non
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Do notes_on math in integer instead of floating point to avoid denormal issues on some CPUs. 

Avoid scanning notes_on for ports on which there are no notes playing.
This commit is contained in:
Jonathan Moore Liles 2008-03-23 01:23:06 -05:00
parent fbe232fcfb
commit c307a3443c
1 changed files with 43 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
jack.C
View File

@ -48,12 +48,18 @@ int sample_rate;
const int MAX_PORT = 16;
const int subticks_per_tick = 2048;
/* timers for notes on all channels and ports. When a note is played,
* the respective value in this array is set to the note duraction in
* ticks. Decremented in each process cycle, when this value reaches
* zero, a note off is generated--regardless of the state of the
* transport */
double notes_on[MAX_PORT][16][128];
* subticks (an arbitrary division of the tick used only for this
* purpose). Decremented in each process cycle, when this value
* reaches zero, a note off is generated--regardless of the state of
* the transport */
int notes_on[MAX_PORT][16][128];
/* number of notes currently playing on each port */
int port_notes_on[MAX_PORT];
typedef unsigned char byte_t;
@ -114,11 +120,13 @@ midi_output_event ( int port, const midievent *e, tick_t duration )
{
if ( duration )
{
if ( notes_on[ port ][ e->channel() ][ e->note() ] > transport.ticks_per_period )
if ( notes_on[ port ][ e->channel() ][ e->note() ] > transport.ticks_per_period * subticks_per_tick )
WARNING( "duplicate note on?" );
else
{
notes_on[ port ][ e->channel() ][ e->note() ] = (duration + 0.0001f) + (e->timestamp());
notes_on[ port ][ e->channel() ][ e->note() ] = (duration + e->timestamp()) * subticks_per_tick;
++port_notes_on[ port ];
midi_output_event( port, e );
}
@ -168,7 +176,8 @@ midi_output_immediate_event ( int port, const midievent *e )
if ( e->is_note_on() )
{
/* use timestamp as duration */
notes_on[ port ][ e->channel() ][ e->note() ] = e->timestamp();
notes_on[ port ][ e->channel() ][ e->note() ] = e->timestamp() * subticks_per_tick;
++port_notes_on[ port ];
}
}
@ -305,20 +314,24 @@ process ( jack_nframes_t nframes, void *arg )
schedule:
for ( int i = MAX_PORT; i-- ; )
const int subticks_per_period = transport.ticks_per_period * subticks_per_tick;
for ( uint i = MAX_PORT; i-- ; )
{
/* reserve and clear buffers */
output[ i ].buf = jack_port_get_buffer( output[ i ].port, nframes );
jack_midi_clear_buffer( output[ i ].buf );
if ( port_notes_on[ i ] > 0 )
{
/* handle scheduled note offs */
for ( uint j = 16; j-- ; )
{
register double *note = &notes_on[ i ][ j ][ 0 ];
register int *note = &notes_on[ i ][ j ][ 0 ];
for ( register uint k = 0; k < 128; note++, k++ )
for ( register uint k = 0; k < 128; ++note, ++k )
if ( *note )
if ( ( *note -= transport.ticks_per_period ) <= 0 )
if ( ( *note -= subticks_per_period ) <= 0 )
{
static midievent e;
@ -327,14 +340,17 @@ schedule:
e.note( k );
e.note_velocity( 64 );
e.timestamp( ((tick_t)transport.ticks_per_period) + *note );
e.timestamp( (subticks_per_period + *note) / subticks_per_tick );
*note = 0;
--port_notes_on[ i ];
midi_output_event( i, &e );
}
}
}
static midievent e;
/* first, write any immediate events from the UI thread */
while ( jack_ringbuffer_read( output[ i ].ring_buf, (char *)&e, sizeof( midievent ) ) )
@ -402,9 +418,12 @@ midi_init ( void )
/* clear notes */
for ( int p = MAX_PORT; p--; )
{
port_notes_on[ p ] = 0;
for ( int c = 16; c-- ; )
for ( int n = 128; n-- ; )
notes_on[ p ][ c ][ n ] = 0;
}
//1 jack_set_buffer_size_callback( client, bufsize, 0 );
jack_set_process_callback( client, process, 0 );