/* * QEMU Mixing engine * * Copyright (c) 2004 Vassili Karpov (malc) * * 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. */ /* * Tusen tack till Mike Nordell * dec++'ified by Dscho */ #ifdef SIGNED #define HALFT IN_MAX #define HALF IN_MAX #else #define HALFT ((IN_MAX)>>1) #define HALF HALFT #endif static int64_t inline glue(conv_,IN_T) (IN_T v) { #ifdef SIGNED return (INT_MAX*(int64_t)v)/HALF; #else return (INT_MAX*((int64_t)v-HALFT))/HALF; #endif } static IN_T inline glue(clip_,IN_T) (int64_t v) { if (v >= INT_MAX) return IN_MAX; else if (v < -INT_MAX) return IN_MIN; #ifdef SIGNED return (IN_T) (v*HALF/INT_MAX); #else return (IN_T) (v+INT_MAX/2)*HALF/INT_MAX; #endif } static void glue(glue(conv_,IN_T),_to_stereo) (void *dst, const void *src, int samples) { st_sample_t *out = (st_sample_t *) dst; IN_T *in = (IN_T *) src; while (samples--) { out->l = glue(conv_,IN_T) (*in++); out->r = glue(conv_,IN_T) (*in++); out += 1; } } static void glue(glue(conv_,IN_T),_to_mono) (void *dst, const void *src, int samples) { st_sample_t *out = (st_sample_t *) dst; IN_T *in = (IN_T *) src; while (samples--) { out->l = glue(conv_,IN_T) (in[0]); out->r = out->l; out += 1; in += 1; } } static void glue(glue(clip_,IN_T),_from_stereo) (void *dst, const void *src, int samples) { st_sample_t *in = (st_sample_t *) src; IN_T *out = (IN_T *) dst; while (samples--) { *out++ = glue(clip_,IN_T) (in->l); *out++ = glue(clip_,IN_T) (in->r); in += 1; } } static void glue(glue(clip_,IN_T),_from_mono) (void *dst, const void *src, int samples) { st_sample_t *in = (st_sample_t *) src; IN_T *out = (IN_T *) dst; while (samples--) { *out++ = glue(clip_,IN_T) (in->l + in->r); in += 1; } } #undef HALF #undef HALFT