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00030 void NAME (void *opaque, struct st_sample *ibuf, struct st_sample *obuf,
00031 int *isamp, int *osamp)
00032 {
00033 struct rate *rate = opaque;
00034 struct st_sample *istart, *iend;
00035 struct st_sample *ostart, *oend;
00036 struct st_sample ilast, icur, out;
00037 #ifdef FLOAT_MIXENG
00038 mixeng_real t;
00039 #else
00040 int64_t t;
00041 #endif
00042
00043 ilast = rate->ilast;
00044
00045 istart = ibuf;
00046 iend = ibuf + *isamp;
00047
00048 ostart = obuf;
00049 oend = obuf + *osamp;
00050
00051 if (rate->opos_inc == (1ULL + UINT_MAX)) {
00052 int i, n = *isamp > *osamp ? *osamp : *isamp;
00053 for (i = 0; i < n; i++) {
00054 OP (obuf[i].l, ibuf[i].l);
00055 OP (obuf[i].r, ibuf[i].r);
00056 }
00057 *isamp = n;
00058 *osamp = n;
00059 return;
00060 }
00061
00062 while (obuf < oend) {
00063
00064
00065 if (ibuf >= iend) {
00066 break;
00067 }
00068
00069
00070
00071 while (rate->ipos <= (rate->opos >> 32)) {
00072 ilast = *ibuf++;
00073 rate->ipos++;
00074
00075 if (ibuf >= iend) {
00076 goto the_end;
00077 }
00078 }
00079
00080 icur = *ibuf;
00081
00082
00083 #ifdef FLOAT_MIXENG
00084 #ifdef RECIPROCAL
00085 t = (rate->opos & UINT_MAX) * (1.f / UINT_MAX);
00086 #else
00087 t = (rate->opos & UINT_MAX) / (mixeng_real) UINT_MAX;
00088 #endif
00089 out.l = (ilast.l * (1.0 - t)) + icur.l * t;
00090 out.r = (ilast.r * (1.0 - t)) + icur.r * t;
00091 #else
00092 t = rate->opos & 0xffffffff;
00093 out.l = (ilast.l * ((int64_t) UINT_MAX - t) + icur.l * t) >> 32;
00094 out.r = (ilast.r * ((int64_t) UINT_MAX - t) + icur.r * t) >> 32;
00095 #endif
00096
00097
00098 OP (obuf->l, out.l);
00099 OP (obuf->r, out.r);
00100 obuf += 1;
00101 rate->opos += rate->opos_inc;
00102 }
00103
00104 the_end:
00105 *isamp = ibuf - istart;
00106 *osamp = obuf - ostart;
00107 rate->ilast = ilast;
00108 }
00109
00110 #undef NAME
00111 #undef OP