Revision 1d14ffa9 audio/mixeng_template.h
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/* |
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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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* |
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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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* 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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#ifdef NOVOL |
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#define VOL(a, b) a |
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#else |
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#ifdef FLOAT_MIXENG |
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#define VOL(a, b) ((a) * (b)) |
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#else |
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#define VOL(a, b) ((a) * (b)) >> 32 |
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#endif |
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#endif |
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#define ET glue (ENDIAN_CONVERSION, glue (_, IN_T)) |
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#ifdef FLOAT_MIXENG |
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static real_t inline 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 / (real_t) (IN_MAX - IN_MIN)); |
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#else |
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return (nv - HALF) * (1.f / (real_t) IN_MAX); |
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#endif |
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#else /* !RECIPROCAL */ |
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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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return nv / (real_t) (IN_MAX - IN_MIN); |
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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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return (nv - HALF) / (real_t) IN_MAX; |
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#endif |
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#endif |
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} |
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static int64_t inline glue(conv_,IN_T) (IN_T v)
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static IN_T inline glue (clip_, ET) (real_t 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 * (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 (INT_MAX*(int64_t)v)/HALF;
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return ((int64_t) nv) << (32 - SHIFT);
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#else |
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return (INT_MAX*((int64_t)v-HALFT))/HALF;
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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 IN_T inline glue(clip_,IN_T) (int64_t v)
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static inline IN_T glue (clip_, ET) (int64_t v)
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{
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if (v >= INT_MAX)
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if (v >= 0x7f000000) {
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return IN_MAX; |
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else if (v < -INT_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 (IN_T) (v*HALF/INT_MAX);
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return ENDIAN_CONVERT ((IN_T) (v >> (32 - SHIFT)));
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#else |
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return (IN_T) (v+INT_MAX/2)*HALF/INT_MAX;
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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_,IN_T),_to_stereo) (void *dst, const void *src,
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int samples)
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static void glue (glue (conv_, ET), _to_stereo)
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(st_sample_t *dst, const void *src, int samples, volume_t *vol)
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{
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st_sample_t *out = (st_sample_t *) dst;
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st_sample_t *out = dst; |
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IN_T *in = (IN_T *) src; |
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#ifndef NOVOL |
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if (vol->mute) {
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mixeng_clear (dst, samples); |
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return; |
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} |
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#else |
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(void) vol; |
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#endif |
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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->l = VOL (glue (conv_, ET) (*in++), vol->l);
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out->r = VOL (glue (conv_, ET) (*in++), vol->r);
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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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static void glue (glue (conv_, ET), _to_mono)
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(st_sample_t *dst, const void *src, int samples, volume_t *vol)
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{
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st_sample_t *out = (st_sample_t *) dst;
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st_sample_t *out = dst; |
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IN_T *in = (IN_T *) src; |
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#ifndef NOVOL |
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if (vol->mute) {
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mixeng_clear (dst, samples); |
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return; |
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} |
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#else |
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(void) vol; |
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#endif |
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while (samples--) {
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out->l = glue(conv_,IN_T) (in[0]);
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out->l = VOL (glue (conv_, ET) (in[0]), vol->l);
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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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static void glue (glue (clip_, ET), _from_stereo)
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(void *dst, const st_sample_t *src, int samples)
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{
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st_sample_t *in = (st_sample_t *) src;
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const st_sample_t *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_,IN_T) (in->l);
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*out++ = glue(clip_,IN_T) (in->r);
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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_,IN_T),_from_mono) (void *dst, const void *src,
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int samples)
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static void glue (glue (clip_, ET), _from_mono)
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(void *dst, const st_sample_t *src, int samples)
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{
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st_sample_t *in = (st_sample_t *) src;
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const st_sample_t *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_,IN_T) (in->l + in->r);
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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 HALFT |
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#undef VOL |
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