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Diffstat (limited to 'src/audio/mixeng_template.h')
| -rw-r--r-- | src/audio/mixeng_template.h | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/src/audio/mixeng_template.h b/src/audio/mixeng_template.h new file mode 100644 index 0000000..77cc89b --- /dev/null +++ b/src/audio/mixeng_template.h @@ -0,0 +1,154 @@ +/* + * 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 (glue (glue (_, ITYPE), BSIZE), _t)) +#define IN_T glue (glue (ITYPE, BSIZE), _t) + +#ifdef FLOAT_MIXENG +static inline mixeng_real 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) ((mixeng_real) IN_MAX - IN_MIN); +#else + return (nv - HALF) / (mixeng_real) IN_MAX; +#endif +#endif +} + +static inline IN_T 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 * ((mixeng_real) 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 +#undef IN_T |
