85571bc741
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1125 c046a42c-6fe2-441c-8c8c-71466251a162
112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/*
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* QEMU Mixing engine
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*
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* Copyright (c) 2004 Vassili Karpov (malc)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/*
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* Tusen tack till Mike Nordell
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* dec++'ified by Dscho
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*/
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#ifdef SIGNED
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#define HALFT IN_MAX
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#define HALF IN_MAX
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#else
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#define HALFT ((IN_MAX)>>1)
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#define HALF HALFT
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#endif
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static int64_t inline glue(conv_,IN_T) (IN_T v)
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{
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#ifdef SIGNED
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return (INT_MAX*(int64_t)v)/HALF;
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#else
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return (INT_MAX*((int64_t)v-HALFT))/HALF;
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#endif
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}
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static IN_T inline glue(clip_,IN_T) (int64_t v)
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{
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if (v >= INT_MAX)
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return IN_MAX;
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else if (v < -INT_MAX)
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return IN_MIN;
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#ifdef SIGNED
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return (IN_T) (v*HALF/INT_MAX);
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#else
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return (IN_T) (v+INT_MAX/2)*HALF/INT_MAX;
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#endif
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}
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static void glue(glue(conv_,IN_T),_to_stereo) (void *dst, const void *src,
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int samples)
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{
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st_sample_t *out = (st_sample_t *) dst;
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IN_T *in = (IN_T *) src;
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while (samples--) {
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out->l = glue(conv_,IN_T) (*in++);
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out->r = glue(conv_,IN_T) (*in++);
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out += 1;
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}
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}
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static void glue(glue(conv_,IN_T),_to_mono) (void *dst, const void *src,
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int samples)
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{
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st_sample_t *out = (st_sample_t *) dst;
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IN_T *in = (IN_T *) src;
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while (samples--) {
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out->l = glue(conv_,IN_T) (in[0]);
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out->r = out->l;
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out += 1;
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in += 1;
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}
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}
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static void glue(glue(clip_,IN_T),_from_stereo) (void *dst, const void *src,
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int samples)
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{
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st_sample_t *in = (st_sample_t *) src;
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IN_T *out = (IN_T *) dst;
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while (samples--) {
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*out++ = glue(clip_,IN_T) (in->l);
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*out++ = glue(clip_,IN_T) (in->r);
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in += 1;
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}
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}
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static void glue(glue(clip_,IN_T),_from_mono) (void *dst, const void *src,
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int samples)
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{
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st_sample_t *in = (st_sample_t *) src;
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IN_T *out = (IN_T *) dst;
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while (samples--) {
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*out++ = glue(clip_,IN_T) (in->l + in->r);
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in += 1;
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}
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}
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#undef HALF
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#undef HALFT
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