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/*
* 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
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