Archipelago » qemu

/*

 * 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