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voltest.c

/***
  This file is part of PulseAudio.

  PulseAudio is free software; you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published
  by the Free Software Foundation; either version 2.1 of the License,
  or (at your option) any later version.

  PulseAudio is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with PulseAudio; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  USA.
***/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <stdio.h>

#include <pulse/volume.h>
#include <pulse/gccmacro.h>

#include <pulsecore/macro.h>

int main(int argc, char *argv[]) {
    pa_volume_t v;
    pa_cvolume cv;
    float b;
    pa_channel_map map;
    pa_volume_t md = 0;
    unsigned mdn = 0;

    printf("Attenuation of sample 1 against 32767: %g dB\n", 20.0*log10(1.0/32767.0));
    printf("Smallest possible attenutation > 0 applied to 32767: %li\n", lrint(32767.0*pa_sw_volume_to_linear(1)));

    for (v = PA_VOLUME_MUTED; v <= PA_VOLUME_NORM*2; v += 256) {

        double dB = pa_sw_volume_to_dB(v);
        double f = pa_sw_volume_to_linear(v);

        printf("Volume: %3i; percent: %i%%; decibel %0.2f; linear = %0.2f; volume(decibel): %3i; volume(linear): %3i\n",
               v, (v*100)/PA_VOLUME_NORM, dB, f, pa_sw_volume_from_dB(dB), pa_sw_volume_from_linear(f));
    }

    for (v = PA_VOLUME_MUTED; v <= PA_VOLUME_NORM*2; v += 256) {
        char s[PA_CVOLUME_SNPRINT_MAX], t[PA_SW_CVOLUME_SNPRINT_DB_MAX];

        pa_cvolume_set(&cv, 2, v);

        printf("Volume: %3i [%s] [%s]\n",
               v,
               pa_cvolume_snprint(s, sizeof(s), &cv),
               pa_sw_cvolume_snprint_dB(t, sizeof(t), &cv));

    }

    map.channels = cv.channels = 2;
    map.map[0] = PA_CHANNEL_POSITION_LEFT;
    map.map[1] = PA_CHANNEL_POSITION_RIGHT;

    for (cv.values[0] = PA_VOLUME_MUTED; cv.values[0] <= PA_VOLUME_NORM*2; cv.values[0] += 4096)
        for (cv.values[1] = PA_VOLUME_MUTED; cv.values[1] <= PA_VOLUME_NORM*2; cv.values[1] += 4096) {
            char s[PA_CVOLUME_SNPRINT_MAX];

            printf("Volume: [%s]; balance: %2.1f\n", pa_cvolume_snprint(s, sizeof(s), &cv), pa_cvolume_get_balance(&cv, &map));
        }

    for (cv.values[0] = PA_VOLUME_MUTED+4096; cv.values[0] <= PA_VOLUME_NORM*2; cv.values[0] += 4096)
        for (cv.values[1] = PA_VOLUME_MUTED; cv.values[1] <= PA_VOLUME_NORM*2; cv.values[1] += 4096)
            for (b = -1.0f; b <= 1.0f; b += 0.2f) {
                char s[PA_CVOLUME_SNPRINT_MAX];
                pa_cvolume r;
                float k;

                printf("Before: volume: [%s]; balance: %2.1f\n", pa_cvolume_snprint(s, sizeof(s), &cv), pa_cvolume_get_balance(&cv, &map));

                r = cv;
                pa_cvolume_set_balance(&r, &map,b);

                k = pa_cvolume_get_balance(&r, &map);
                printf("After: volume: [%s]; balance: %2.1f (intended: %2.1f) %s\n", pa_cvolume_snprint(s, sizeof(s), &r), k, b, k < b-.05 || k > b+.5 ? "MISMATCH" : "");
            }

    for (v = PA_VOLUME_MUTED; v <= PA_VOLUME_NORM*2; v += 51) {

        double l = pa_sw_volume_to_linear(v);
        pa_volume_t k = pa_sw_volume_from_linear(l);
        double db = pa_sw_volume_to_dB(v);
        pa_volume_t r = pa_sw_volume_from_dB(db);
        pa_volume_t w;

        pa_assert(k == v);
        pa_assert(r == v);

        for (w = PA_VOLUME_MUTED; w < PA_VOLUME_NORM*2; w += 37) {

            double t = pa_sw_volume_to_linear(w);
            double db2 = pa_sw_volume_to_dB(w);
            pa_volume_t p, p1, p2;
            double q, qq;

            p = pa_sw_volume_multiply(v, w);
            qq = db + db2;
            p2 = pa_sw_volume_from_dB(qq);
            q = l*t;
            p1 = pa_sw_volume_from_linear(q);

            if (p2 > p && p2 - p > md)
                md = p2 - p;
            if (p2 < p && p - p2 > md)
                md = p - p2;
            if (p1 > p && p1 - p > md)
                md = p1 - p;
            if (p1 < p && p - p1 > md)
                md = p - p1;

            if (p1 != p || p2 != p)
                mdn++;
        }
    }

    printf("max deviation: %lu n=%lu\n", (unsigned long) md, (unsigned long) mdn);

    pa_assert(md <= 1);
    pa_assert(mdn <= 251);

    return 0;
}

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