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cmDspKr.c : Improved comments on cmDspAmSync object.

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This commit is contained in:
kevin 2013-11-21 17:25:09 -08:00
parent 19224be46a
commit 0857f64730
1 changed files with 34 additions and 3 deletions
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37
dsp/cmDspKr.c
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@ -1918,6 +1918,31 @@ struct cmDspClass_str* cmActiveMeasClassCons( cmDspCtx_t* ctx )
//==========================================================================================================================================
// Audio MIDI Sync
/*
Usage:
1) In the program resource file setup a list of sync points.
'asmp' refers to a sample offset into the audio file 'af'
which should match to the midi event index 'mid' in the
midi file 'mf'.
amSync :
[
{ af:"af-16" asmp:34735276 mf:"mf-10" mid:350 }
{ af:"af-16" asmp:71802194 mf:"mf-10" mid:787 }
]
2) Feed the 'fidx' output from a wave table loaded with 'af' into the 'asmp' input port of this amSync object.
Feed the 'id' output from the MIDI file player loaded with 'mf' into the 'mid' input port of this amSync object.
3) Run the players.
4) When the run is complete send any message to the 'sel' port of this amSync object.
The 'frm:' field of the printed output gives the difference in samples between
MIDI and audio sync points.
If the value is positive then the MIDI point is after the Audio point.
If the value is negative then the MIDI point is before the audio point.
*/
enum
{
@ -1944,8 +1969,8 @@ typedef struct cmDspAmSyncEntry_str
const cmChar_t* mfn; // midi file name
unsigned asmp; // Audio sample index to sync to MIDI event
unsigned mid; // MIDI event unique id (cmMidiTrackMsg_t.uid)
int afi; //
int mfi;
int afi; // closest DSP system cycle index to the reference audio sample index (asmp).
int mfi; // DSP system cycle on which the reference MIDI event (mid) arrived.
unsigned state; // as incoming msg match this record the state is updated with kXXXAmFl flags
} cmDspAmSyncEntry_t;
@ -2093,7 +2118,7 @@ cmDspRC_t _cmDspAmSyncRecv(cmDspCtx_t* ctx, cmDspInst_t* inst, const cmDspEvt_t*
case kMFnAmId:
{
// an midi file name just arrived - set p->mcur to point to it
// a midi file name just arrived - set p->mcur to point to it
const cmChar_t* fn = cmDspStrcz(inst, kMFnAmId );
for(i=0; i<p->arrayCnt; ++i)
if( strcmp(fn,p->array[i].mfn) == 0 )
@ -2113,6 +2138,9 @@ cmDspRC_t _cmDspAmSyncRecv(cmDspCtx_t* ctx, cmDspInst_t* inst, const cmDspEvt_t*
if( p->acur != NULL )
for(i=0; i<p->arrayCnt; ++i)
{
// if the audio sync point is before or on the new audio file sample index then
// this is the closest audio file index to the audio sync point - record the
// associated cycleCnt
cmDspAmSyncEntry_t* r = p->array + i;
if( cmIsNotFlag(r->state,kAsmpAmFl) && r->asmp <= v && strcmp(p->acur->afn,r->afn)==0 )
{
@ -2126,10 +2154,13 @@ cmDspRC_t _cmDspAmSyncRecv(cmDspCtx_t* ctx, cmDspInst_t* inst, const cmDspEvt_t*
case kMIdAmId:
{
// a new MIDI event was received
int v = cmDspInt(inst,kMIdAmId);
if( p->mcur != NULL )
for(i=0; i<p->arrayCnt; ++i)
{
// if the new MIDI event matched the MIDI sync point then record the
// current cycleCnt.
cmDspAmSyncEntry_t* r = p->array + i;
if( cmIsNotFlag(r->state,kMidAmFl) && r->mid == v && strcmp(p->mcur->mfn,r->mfn)==0 )
{