core1/audio/n_adpcm.c done
This commit is contained in:
Banjo Kazooie
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#include <ultra64.h>
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#include "n_synth.h"
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//see libultre src/audio/load.c
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#pragma GLOBAL_ASM("asm/nonmatchings/core1/audio/n_adpcm/_n_decodeChunk.s")
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#pragma GLOBAL_ASM("asm/nonmatchings/core1/audio/n_adpcm/n_alAdpcmPull.s")
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213
src/core1/done/audio/n_adpcm.c
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213
src/core1/done/audio/n_adpcm.c
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#include <ultra64.h>
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#include "n_synth.h"
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#ifndef MIN
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# define MIN(a,b) (((a)<(b))?(a):(b))
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#endif
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#ifdef AUD_PROFILE
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extern u32 cnt_index, adpcm_num, adpcm_cnt, adpcm_max, adpcm_min, lastCnt[];
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#endif
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#define ADPCMFBYTES 9
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#define LFSAMPLES 4
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static
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Acmd *_n_decodeChunk(Acmd *ptr, N_ALLoadFilter *f, s32 tsam, s32 nbytes, s16 outp, s16 inp, u32 flags);
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Acmd *n_alAdpcmPull(void *filter, s16 *outp, s32 outCount, Acmd *p)
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{
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Acmd *ptr = p;
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s16 inp;
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s32 tsam;
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s32 nframes;
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s32 nbytes;
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s32 overFlow;
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s32 startZero;
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s32 nOver;
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s32 nSam;
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s32 op;
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s32 nLeft;
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s32 bEnd;
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s32 decoded = 0;
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s32 looped = 0;
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N_ALLoadFilter *f = (N_ALLoadFilter *)filter;
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#ifdef AUD_PROFILE
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lastCnt[++cnt_index] = osGetCount();
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#endif
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if (outCount == 0)
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return ptr;
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inp = AL_DECODER_IN;
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aLoadADPCM(ptr++, f->bookSize,
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K0_TO_PHYS(f->table->waveInfo.adpcmWave.book->book));
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looped = (outCount + f->sample > f->loop.end) && (f->loop.count != 0);
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if (looped)
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nSam = f->loop.end - f->sample;
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else
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nSam = outCount;
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if (f->lastsam)
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nLeft = ADPCMFSIZE - f->lastsam;
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else
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nLeft = 0;
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tsam = nSam - nLeft;
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if (tsam<0) tsam = 0;
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nframes = (tsam+ADPCMFSIZE-1)>>LFSAMPLES;
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nbytes = nframes*ADPCMFBYTES;
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if (looped){
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ptr = _n_decodeChunk(ptr, f, tsam, nbytes, *outp, inp, f->first);
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/*
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* Fix up output pointer, which will be used as the input pointer
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* by the following module.
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*/
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if (f->lastsam)
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*outp += (f->lastsam<<1);
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else
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*outp += (ADPCMFSIZE<<1);
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/*
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* Now fix up state info to reflect the loop start point
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*/
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f->lastsam = f->loop.start &0xf;
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f->memin = (s32) f->table->base + ADPCMFBYTES *
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((s32) (f->loop.start>>LFSAMPLES) + 1);
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f->sample = f->loop.start;
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bEnd = *outp;
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while (outCount > nSam){
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outCount -= nSam;
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/*
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* Put next one after the end of the last lot - on the
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* frame boundary (32 byte) after the end.
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*/
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op = (bEnd + ((nframes+1)<<(LFSAMPLES+1)) + 0x10) & ~0x1f;
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/*
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* The actual end of data
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*/
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bEnd += (nSam<<1);
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/*
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* -1 is loop forever - the loop count is not exact now
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* for small loops!
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*/
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if ((f->loop.count != -1) && (f->loop.count != 0))
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f->loop.count--;
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/*
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* What's left to compute.
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*/
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nSam = MIN(outCount, f->loop.end - f->loop.start);
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tsam = nSam - ADPCMFSIZE + f->lastsam;
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if (tsam<0) tsam = 0;
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nframes = (tsam+ADPCMFSIZE-1)>>LFSAMPLES;
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nbytes = nframes*ADPCMFBYTES;
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ptr = _n_decodeChunk(ptr, f, tsam, nbytes, op, inp, f->first | A_LOOP);
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/*
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* Merge the two sections in DMEM.
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*/
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aDMEMMove(ptr++, op+(f->lastsam<<1), bEnd, nSam<<1);
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}
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f->lastsam = (outCount + f->lastsam) & 0xf;
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f->sample += outCount;
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f->memin += ADPCMFBYTES*nframes;
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#ifdef AUD_PROFILE
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PROFILE_AUD(adpcm_num, adpcm_cnt, adpcm_max, adpcm_min);
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#endif
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return ptr;
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}
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/*
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* The unlooped case, which is executed most of the time
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*/
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nSam = nframes<<LFSAMPLES;
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/*
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* overFlow is the number of bytes past the end
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* of the bitstream I try to generate
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*/
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overFlow = f->memin + nbytes - ((s32) f->table->base + f->table->len);
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if (overFlow < 0)
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overFlow = 0;
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nOver = (overFlow/ADPCMFBYTES)<<LFSAMPLES;
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if (nOver > nSam + nLeft)
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nOver = nSam + nLeft;
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nbytes -= overFlow;
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if ((nOver - (nOver & 0xf))< outCount){
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decoded = 1;
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ptr = _n_decodeChunk(ptr, f, nSam - nOver, nbytes, *outp, inp, f->first);
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if (f->lastsam)
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*outp += (f->lastsam<<1);
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else
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*outp += (ADPCMFSIZE<<1);
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f->lastsam = (outCount + f->lastsam) & 0xf;
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f->sample += outCount;
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f->memin += ADPCMFBYTES*nframes;
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} else {
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f->lastsam = 0;
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f->memin += ADPCMFBYTES*nframes;
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}
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/*
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* Put zeros in if necessary
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*/
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if (nOver){
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f->lastsam = 0;
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if (decoded)
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startZero = (nLeft + nSam - nOver)<<1;
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else
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startZero = 0;
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aClearBuffer(ptr++, startZero + *outp, nOver<<1);
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}
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#ifdef AUD_PROFILE
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PROFILE_AUD(adpcm_num, adpcm_cnt, adpcm_max, adpcm_min);
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#endif
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return ptr;
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}
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Acmd *_n_decodeChunk(Acmd *ptr, N_ALLoadFilter *f, s32 tsam, s32 nbytes, s16 outp, s16 inp, u32 flags)
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{
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s32
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dramAlign,
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dramLoc;
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if (nbytes > 0){
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dramLoc = (f->dma)(f->memin, nbytes, f->dmaState);
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/*
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* Make sure enough is loaded into DMEM to take care
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* of 8 byte alignment
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*/
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dramAlign = dramLoc & 0x7;
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nbytes += dramAlign;
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n_aLoadBuffer(ptr++, nbytes + 8 - (nbytes & 0x7), inp, dramLoc - dramAlign);
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} else
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dramAlign = 0;
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if (flags & A_LOOP){
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aSetLoop(ptr++, K0_TO_PHYS(f->lstate));
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}
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n_aADPCMdec(ptr++, K0_TO_PHYS(f->state), flags, tsam<<1, dramAlign, outp);
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f->first = 0;
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return ptr;
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}
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