/* * QEMU Mixing engine * * Copyright (c) 2004-2005 Vassili Karpov (malc) * Copyright (c) 1998 Fabrice Bellard * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ /* * Processed signed long samples from ibuf to obuf. * Return number of samples processed. */ void NAME (void *opaque, st_sample_t *ibuf, st_sample_t *obuf, int *isamp, int *osamp) { rate_t rate = (rate_t) opaque; st_sample_t *istart, *iend; st_sample_t *ostart, *oend; st_sample_t ilast, icur, out; #ifdef FLOAT_MIXENG real_t t; #else int64_t t; #endif ilast = rate->ilast; istart = ibuf; iend = ibuf + *isamp; ostart = obuf; oend = obuf + *osamp; if (rate->opos_inc == (1ULL + UINT_MAX)) { int i, n = *isamp > *osamp ? *osamp : *isamp; for (i = 0; i < n; i++) { OP (obuf[i].l, ibuf[i].r); OP (obuf[i].r, ibuf[i].r); } *isamp = n; *osamp = n; return; } while (obuf < oend) { /* Safety catch to make sure we have input samples. */ if (ibuf >= iend) { break; } /* read as many input samples so that ipos > opos */ while (rate->ipos <= (rate->opos >> 32)) { ilast = *ibuf++; rate->ipos++; /* See if we finished the input buffer yet */ if (ibuf >= iend) { goto the_end; } } icur = *ibuf; /* interpolate */ #ifdef FLOAT_MIXENG #ifdef RECIPROCAL t = (rate->opos & UINT_MAX) * (1.f / UINT_MAX); #else t = (rate->opos & UINT_MAX) / (real_t) UINT_MAX; #endif out.l = (ilast.l * (1.0 - t)) + icur.l * t; out.r = (ilast.r * (1.0 - t)) + icur.r * t; #else t = rate->opos & 0xffffffff; out.l = (ilast.l * ((int64_t) UINT_MAX - t) + icur.l * t) >> 32; out.r = (ilast.r * ((int64_t) UINT_MAX - t) + icur.r * t) >> 32; #endif /* output sample & increment position */ OP (obuf->l, out.l); OP (obuf->r, out.r); obuf += 1; rate->opos += rate->opos_inc; } the_end: *isamp = ibuf - istart; *osamp = obuf - ostart; rate->ilast = ilast; } #undef NAME #undef OP