n_resample.c
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/*====================================================================
*
* Copyright 1993, Silicon Graphics, Inc.
* All Rights Reserved.
*
* This is UNPUBLISHED PROPRIETARY SOURCE CODE of Silicon Graphics,
* Inc.; the contents of this file may not be disclosed to third
* parties, copied or duplicated in any form, in whole or in part,
* without the prior written permission of Silicon Graphics, Inc.
*
* RESTRICTED RIGHTS LEGEND:
* Use, duplication or disclosure by the Government is subject to
* restrictions as set forth in subdivision (c)(1)(ii) of the Rights
* in Technical Data and Computer Software clause at DFARS
* 252.227-7013, and/or in similar or successor clauses in the FAR,
* DOD or NASA FAR Supplement. Unpublished - rights reserved under the
* Copyright Laws of the United States.
*====================================================================*/
#include "n_synthInternals.h"
#include <os.h>
#include <stdio.h>
#ifdef AUD_PROFILE
extern u32 cnt_index, resampler_num, resampler_cnt, resampler_max, resampler_min, lastCnt[];
#endif
/***********************************************************************
* Resampler filter public interfaces
***********************************************************************/
Acmd *n_alResamplePull(N_PVoice *e, s16 *outp, Acmd *p)
{
Acmd *ptr = p;
s16 inp;
s32 inCount;
s32 incr;
f32 finCount;
#ifdef AUD_PROFILE
lastCnt[++cnt_index] = osGetCount();
#endif
#ifndef N_MICRO
inp = AL_DECODER_OUT;
#else
inp = N_AL_DECODER_OUT;
#endif
/*
* check if resampler is required
*/
if (e->rs_upitch) {
ptr = n_alAdpcmPull(e, &inp, FIXED_SAMPLE, p);
aDMEMMove(ptr++, inp, *outp , FIXED_SAMPLE<<1);
} else {
/*
* clip to maximum allowable pitch
* FIXME: should we check for some minimum as well?
*/
if (e->rs_ratio > MAX_RATIO) e->rs_ratio = MAX_RATIO;
/*
* quantize the pitch
*/
e->rs_ratio = (s32)(e->rs_ratio * UNITY_PITCH);
e->rs_ratio = e->rs_ratio / UNITY_PITCH;
/*
* determine how many samples to generate
*/
finCount = e->rs_delta + (e->rs_ratio * (f32)FIXED_SAMPLE);
inCount = (s32) finCount;
e->rs_delta = finCount - (f32)inCount;
/*
* ask all filters upstream from us to build their command
* lists.
*/
ptr = n_alAdpcmPull(e, &inp,inCount, p);
/*
* construct our portion of the command list
*/
incr = (s32)(e->rs_ratio * UNITY_PITCH);
#ifndef N_MICRO
aSetBuffer(ptr++, 0, inp , *outp, FIXED_SAMPLE<<1);
aResample(ptr++, e->rs_first, incr, osVirtualToPhysical(e->rs_state));
#else
#include "n_resample_add01.c"
#endif
e->rs_first = 0;
}
#ifdef AUD_PROFILE
PROFILE_AUD(resampler_num, resampler_cnt, resampler_max, resampler_min);
#endif
return ptr;
}
s32 n_alResampleParam(N_PVoice *filter, s32 paramID, void *param)
{
N_PVoice *r = filter;
union {
f32 f;
s32 i;
} data;
switch (paramID) {
#if 0
case (AL_FILTER_RESET):
r->rs_delta = 0.0;
r->rs_first = 1;
r->rs_upitch = 0;
n_alLoadParam(filter, AL_FILTER_RESET, 0);
break;
case (AL_FILTER_START):
n_alLoadParam(filter, AL_FILTER_START, 0);
break;
case (AL_FILTER_SET_PITCH):
data.i = (s32) param;
r->rs_ratio = data.f;
break;
case (AL_FILTER_SET_UNITY_PITCH):
r->rs_upitch = 1;
break;
#endif
default:
n_alLoadParam(filter, paramID, param);
break;
}
return 0;
}