cmMidiFile.h/c : Rewrote the way absolute time is calculated. Added _cmMidiFileSetAccumlateTick() and _cmMidiFileSetAbsoluteTime().
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kevin
parent
f69fd6dcb0
commit
7c4290579d
156
cmMidiFile.c
156
cmMidiFile.c
@ -422,6 +422,99 @@ int _cmMidiFileSortFunc( const void *p0, const void* p1 )
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return (*(cmMidiTrackMsg_t**)p0)->atick < (*(cmMidiTrackMsg_t**)p1)->atick ? -1 : 1;
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}
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// Set the absolute accumulated ticks (atick) value of each track message.
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// The absolute accumulated ticks gives a global time ordering for all
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// messages in the file.
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void _cmMidiFileSetAccumulateTicks( _cmMidiFile_t* p )
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{
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cmMidiTrackMsg_t* nextTrkMsg[ p->trkN ]; // next msg in each track
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unsigned atick = 0;
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unsigned i;
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// iniitalize nextTrkTick[] and nextTrkMsg[].
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for(i=0; i<p->trkN; ++i)
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if((nextTrkMsg[i] = p->trkV[i].base) != NULL )
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nextTrkMsg[i]->atick = nextTrkMsg[i]->dtick;
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while(1)
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{
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unsigned k = cmInvalidIdx;
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// find the trk which has the next msg (min atick time)
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for(i=0; i<p->trkN; ++i)
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if( nextTrkMsg[i]!=NULL && (k==cmInvalidIdx || nextTrkMsg[i]->atick < nextTrkMsg[k]->atick) )
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k = i;
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// no next msg was found - we're done
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if( k == cmInvalidIdx )
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break;
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// store the current atick
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atick = nextTrkMsg[k]->atick;
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// advance the selected track to it's next message
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nextTrkMsg[k] = nextTrkMsg[k]->link;
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// set the selected tracks next atick time
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if( nextTrkMsg[k] != NULL )
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nextTrkMsg[k]->atick = atick + nextTrkMsg[k]->dtick;
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}
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}
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void _cmMidiFileSetAbsoluteTime( _cmMidiFile_t* mfp )
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{
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double microsPerQN = 60000000/120; // default tempo;
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double amicro = 0;
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double microsPerTick = microsPerQN / mfp->ticksPerQN;
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double maxDMicro = 60000000;
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bool fl = true;
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unsigned i;
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for(i=0; i<mfp->msgN; ++i)
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{
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cmMidiTrackMsg_t* mp = mfp->msgV[i];
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unsigned dtick = 0;
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if( i > 0 )
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{
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// atick must have already been set and sorted
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assert( mp->atick >= mfp->msgV[i-1]->atick );
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dtick = mp->atick - mfp->msgV[i-1]->atick;
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}
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// if this is the first msg with a dtick greater than zero
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if( fl && mfp->msgV[i]->dtick > 0 )
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{
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fl = false;
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// if this mesg has a large offset
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if( microsPerTick * dtick > maxDMicro )
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{
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cmErrWarnMsg(&mfp->err,kLargeDeltaTickMfRC,"A message delta time of %f seconds was decreased to %f seconds.",(double)microsPerTick * dtick/1000000.0,(double)maxDMicro/1000000.0);
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// change the dtick to 1 (so it will still be the first msg w/ a non-zero dtick)
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mfp->msgV[i]->dtick = 1;
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// dtick changed so the aticks need to be recalculated
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_cmMidiFileSetAccumulateTicks(mfp);
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// call this function recursively
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return _cmMidiFileSetAbsoluteTime(mfp);
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}
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}
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amicro += microsPerTick * dtick;
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mp->amicro = round(amicro);
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// track tempo changes
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if( mp->status == kMetaStId && mp->metaId == kTempoMdId )
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microsPerTick = mp->u.iVal / mfp->ticksPerQN;
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}
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}
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cmMfRC_t _cmMidiFileClose( _cmMidiFile_t* mfp )
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{
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cmMfRC_t rc = kOkMfRC;
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@ -451,6 +544,7 @@ cmMfRC_t cmMidiFileOpen( cmCtx_t* ctx, cmMidiFileH_t* hPtr, const char* fn )
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_cmMidiFile_t* mfp = NULL;
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unsigned short trkIdx = 0;
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cmErr_t err;
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unsigned i,j;
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if( cmMidiFileIsValid(*hPtr) )
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if((rc = _cmMidiFileClose(_cmMidiFileHandleToPtr(*hPtr))) != kOkMfRC )
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@ -521,17 +615,32 @@ cmMfRC_t cmMidiFileOpen( cmCtx_t* ctx, cmMidiFileH_t* hPtr, const char* fn )
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// allocate the trk msg index vector: msgV[]
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mfp->msgV = cmMemAllocZ(cmMidiTrackMsg_t*, mfp->msgN);
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// store a pointer to every trk msg in msgV[]
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// and convert tick to absolute tick
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mfp->nextUid = 0;
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// store a pointer to every trk msg in msgV[] and set 'uid'
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for(i=0,j=0; i<mfp->trkN; ++i)
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{
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cmMidiTrackMsg_t* m = mfp->trkV[i].base;
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for(; m!=NULL; m=m->link)
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{
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assert( j < mfp->msgN );
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mfp->msgV[j++] = m;
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m->uid = mfp->nextUid++;
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}
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}
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/*
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double microsPerQN = 60000000/120; // default tempo;
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double microsPerTick;
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double maxDMicro = 60.0 * 1000000.0; // max time between events (60 seconds)
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unsigned i = 0;
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for(trkIdx=0; trkIdx<mfp->trkN; ++trkIdx)
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{
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unsigned tick = 0;
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unsigned tick = 0;
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cmMidiTrackMsg_t* tmp = mfp->trkV[ trkIdx ].base;
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microsPerTick = microsPerQN / mfp->ticksPerQN;
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@ -540,29 +649,42 @@ cmMfRC_t cmMidiFileOpen( cmCtx_t* ctx, cmMidiFileH_t* hPtr, const char* fn )
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{
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assert( i < mfp->msgN);
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tick += tmp->dtick; // convert delta-ticks to absolute ticks
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tmp->atick = tick;
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tmp->uid = mfp->nextUid++; // assign the msg uid
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mfp->msgV[i] = tmp;
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// convert dtick to microseconds
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unsigned dmicro = round(tmp->dtick * microsPerTick);
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if( dmicro > maxDMicro )
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{
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tmp->dtick = round(maxDMicro / microsPerTick);
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cmErrWarnMsg(&mfp->err,kLargeDeltaTickMfRC,"A message delta time of %f seconds was decreased to %f seconds.",(double)dmicro/1000000.0,(double)maxDMicro/1000000.0);
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}
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tick += tmp->dtick; // convert delta-ticks to absolute ticks
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tmp->atick = tick;
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tmp->uid = mfp->nextUid++; // assign the msg uid
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tmp->dmicro = dmicro;
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mfp->msgV[i] = tmp;
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// track tempo changes
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if( tmp->status == kMetaStId && tmp->metaId == kTempoMdId )
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microsPerTick = tmp->u.iVal / mfp->ticksPerQN;
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// convert dtick to microseconds
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tmp->dmicro = round(tmp->dtick * microsPerTick);
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tmp = tmp->link;
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++i;
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}
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}
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*/
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//
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_cmMidiFileSetAccumulateTicks(mfp);
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// sort msgV[] in ascending order on atick
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qsort( mfp->msgV, mfp->msgN, sizeof(cmMidiTrackMsg_t*), _cmMidiFileSortFunc );
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_cmMidiFileSetAbsoluteTime(mfp);
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/*
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// set the amicro field of each midi message to the
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// absolute time offset in microseconds
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unsigned mi;
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@ -587,6 +709,7 @@ cmMfRC_t cmMidiFileOpen( cmCtx_t* ctx, cmMidiFileH_t* hPtr, const char* fn )
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amicro += microsPerTick * dtick;
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mp->amicro = round(amicro);
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}
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*/
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//for(i=0; i<25; ++i)
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// printf("%i 0x%x 0x%x\n",mfp->msgV[i]->tick,mfp->msgV[i]->status,mfp->msgV[i]->metaId);
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@ -1378,8 +1501,8 @@ void _cmMidiFilePrintHdr( const _cmMidiFile_t* mfp, cmRpt_t* rpt )
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cmRptPrintf(rpt,"fmt:%i ticksPerQN:%i tracks:%i\n",mfp->fmtId,mfp->ticksPerQN,mfp->trkN);
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cmRptPrintf(rpt," UID dtick dmicro atick amicro type ch D0 D1\n");
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cmRptPrintf(rpt,"----- ---------- ---------- ---------- ---------- : ---- --- --- ---\n");
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cmRptPrintf(rpt," UID dtick atick amicro type ch D0 D1\n");
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cmRptPrintf(rpt,"----- ---------- ---------- ---------- : ---- --- --- ---\n");
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}
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@ -1388,7 +1511,6 @@ void _cmMidiFilePrintMsg( cmRpt_t* rpt, const cmMidiTrackMsg_t* tmp )
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cmRptPrintf(rpt,"%5i %10u %10u %10u %10u : ",
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tmp->uid,
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tmp->dtick,
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tmp->dmicro,
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tmp->atick,
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tmp->amicro );
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@ -65,7 +65,6 @@ extern "C" {
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{
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unsigned uid; // uid's are unique among all msg's in the file
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unsigned dtick; // delta ticks between events on this track
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unsigned dmicro; // delta microseconds between events on this track adjusted for tempo changes
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unsigned atick; // global (all tracks interleaved) accumulated ticks
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unsigned amicro; // global (all tracks interleaved) accumulated microseconds adjusted for tempo changes
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cmMidiByte_t status; // ch msg's have the channel value removed (it is stored in u.chMsgPtr->ch)
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@ -101,7 +100,8 @@ extern "C" {
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kInvalidHandleMfRC, // 7
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kMissingNoteOffMfRC, // 8
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kInvalidStatusMfRC, // 9
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kSustainPedalMfRC // 10
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kSustainPedalMfRC, // 10
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kLargeDeltaTickMfRC // 11 (a large delta tick value was filtered)
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};
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extern cmMidiFileH_t cmMidiFileNullHandle;
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