mirror of https://gitee.com/openkylin/qemu.git
155 lines
3.9 KiB
C
155 lines
3.9 KiB
C
/*
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* QEMU Mixing engine
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*
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* Copyright (c) 2004-2005 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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#ifndef SIGNED
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#define HALF (IN_MAX >> 1)
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#endif
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#define ET glue (ENDIAN_CONVERSION, glue (glue (glue (_, ITYPE), BSIZE), _t))
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#define IN_T glue (glue (ITYPE, BSIZE), _t)
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#ifdef FLOAT_MIXENG
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static inline mixeng_real glue (conv_, ET) (IN_T v)
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{
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IN_T nv = ENDIAN_CONVERT (v);
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#ifdef RECIPROCAL
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#ifdef SIGNED
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return nv * (1.f / (mixeng_real) (IN_MAX - IN_MIN));
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#else
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return (nv - HALF) * (1.f / (mixeng_real) IN_MAX);
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#endif
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#else /* !RECIPROCAL */
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#ifdef SIGNED
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return nv / (mixeng_real) ((mixeng_real) IN_MAX - IN_MIN);
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#else
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return (nv - HALF) / (mixeng_real) IN_MAX;
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#endif
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#endif
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}
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static inline IN_T glue (clip_, ET) (mixeng_real v)
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{
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if (v >= 0.5) {
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return IN_MAX;
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}
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else if (v < -0.5) {
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return IN_MIN;
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}
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#ifdef SIGNED
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return ENDIAN_CONVERT ((IN_T) (v * ((mixeng_real) IN_MAX - IN_MIN)));
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#else
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return ENDIAN_CONVERT ((IN_T) ((v * IN_MAX) + HALF));
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#endif
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}
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#else /* !FLOAT_MIXENG */
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static inline int64_t glue (conv_, ET) (IN_T v)
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{
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IN_T nv = ENDIAN_CONVERT (v);
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#ifdef SIGNED
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return ((int64_t) nv) << (32 - SHIFT);
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#else
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return ((int64_t) nv - HALF) << (32 - SHIFT);
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#endif
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}
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static inline IN_T glue (clip_, ET) (int64_t v)
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{
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if (v >= 0x7f000000) {
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return IN_MAX;
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}
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else if (v < -2147483648LL) {
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return IN_MIN;
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}
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#ifdef SIGNED
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return ENDIAN_CONVERT ((IN_T) (v >> (32 - SHIFT)));
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#else
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return ENDIAN_CONVERT ((IN_T) ((v >> (32 - SHIFT)) + HALF));
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#endif
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}
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#endif
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static void glue (glue (conv_, ET), _to_stereo)
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(struct st_sample *dst, const void *src, int samples)
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{
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struct st_sample *out = 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_, ET) (*in++);
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out->r = glue (conv_, ET) (*in++);
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out += 1;
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}
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}
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static void glue (glue (conv_, ET), _to_mono)
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(struct st_sample *dst, const void *src, int samples)
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{
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struct st_sample *out = 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_, ET) (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_, ET), _from_stereo)
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(void *dst, const struct st_sample *src, int samples)
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{
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const struct st_sample *in = src;
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IN_T *out = (IN_T *) dst;
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while (samples--) {
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*out++ = glue (clip_, ET) (in->l);
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*out++ = glue (clip_, ET) (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_, ET), _from_mono)
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(void *dst, const struct st_sample *src, int samples)
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{
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const struct st_sample *in = src;
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IN_T *out = (IN_T *) dst;
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while (samples--) {
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*out++ = glue (clip_, ET) (in->l + in->r);
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in += 1;
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}
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}
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#undef ET
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#undef HALF
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#undef IN_T
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