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Tag: 20121115
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/*
* QEMU Mixing engine
*
* Copyright (c) 2004-2005 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
*/
#ifndef SIGNED
#define HALF (IN_MAX >> 1)
#endif
#define ET glue (ENDIAN_CONVERSION, glue (_, IN_T))
#ifdef FLOAT_MIXENG
static mixeng_real inline glue (conv_, ET) (IN_T v)
{
IN_T nv = ENDIAN_CONVERT (v);
#ifdef RECIPROCAL
#ifdef SIGNED
return nv * (1.f / (mixeng_real) (IN_MAX - IN_MIN));
#else
return (nv - HALF) * (1.f / (mixeng_real) IN_MAX);
#endif
#else /* !RECIPROCAL */
#ifdef SIGNED
return nv / (mixeng_real) (IN_MAX - IN_MIN);
#else
return (nv - HALF) / (mixeng_real) IN_MAX;
#endif
#endif
}
static IN_T inline glue (clip_, ET) (mixeng_real v)
{
if (v >= 0.5) {
return IN_MAX;
}
else if (v < -0.5) {
return IN_MIN;
}
#ifdef SIGNED
return ENDIAN_CONVERT ((IN_T) (v * (IN_MAX - IN_MIN)));
#else
return ENDIAN_CONVERT ((IN_T) ((v * IN_MAX) + HALF));
#endif
}
#else /* !FLOAT_MIXENG */
static inline int64_t glue (conv_, ET) (IN_T v)
{
IN_T nv = ENDIAN_CONVERT (v);
#ifdef SIGNED
return ((int64_t) nv) << (32 - SHIFT);
#else
return ((int64_t) nv - HALF) << (32 - SHIFT);
#endif
}
static inline IN_T glue (clip_, ET) (int64_t v)
{
if (v >= 0x7f000000) {
return IN_MAX;
}
else if (v < -2147483648LL) {
return IN_MIN;
}
#ifdef SIGNED
return ENDIAN_CONVERT ((IN_T) (v >> (32 - SHIFT)));
#else
return ENDIAN_CONVERT ((IN_T) ((v >> (32 - SHIFT)) + HALF));
#endif
}
#endif
static void glue (glue (conv_, ET), _to_stereo)
(struct st_sample *dst, const void *src, int samples)
{
struct st_sample *out = dst;
IN_T *in = (IN_T *) src;
while (samples--) {
out->l = glue (conv_, ET) (*in++);
out->r = glue (conv_, ET) (*in++);
out += 1;
}
}
static void glue (glue (conv_, ET), _to_mono)
(struct st_sample *dst, const void *src, int samples)
{
struct st_sample *out = dst;
IN_T *in = (IN_T *) src;
while (samples--) {
out->l = glue (conv_, ET) (in[0]);
out->r = out->l;
out += 1;
in += 1;
}
}
static void glue (glue (clip_, ET), _from_stereo)
(void *dst, const struct st_sample *src, int samples)
{
const struct st_sample *in = src;
IN_T *out = (IN_T *) dst;
while (samples--) {
*out++ = glue (clip_, ET) (in->l);
*out++ = glue (clip_, ET) (in->r);
in += 1;
}
}
static void glue (glue (clip_, ET), _from_mono)
(void *dst, const struct st_sample *src, int samples)
{
const struct st_sample *in = src;
IN_T *out = (IN_T *) dst;
while (samples--) {
*out++ = glue (clip_, ET) (in->l + in->r);
in += 1;
}
}
#undef ET
#undef HALF
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