effect/effect.cpp

/*
 * Copyright (c) 2020, The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.
 *     * Neither the name of The Linux Foundation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "effect.h"

#define ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a)))

/* ~170 HZ sine waveform */
static const int8_t effect_0[] = {
    17,  34,  50,  65,  79,  92,  103, 112, 119, 124,
    127, 127, 126, 122, 116, 108, 98,  86,  73,  58,
    42,  26,  9,   -8,  -25, -41, -57, -72, -85, -97,
    -108, -116, -122, -126, -127, -127, -125, -120,
    -113, -104, -93,  -80, -66, -51, -35, -18, -1,
};

static const int8_t effect_1[] = {
    -1, -18, -35, -51, -66, -80, -93, -104, -113,
    -120, -125, -127, -127, -126, -122, -116, -108,
    -97, -85, -72, -57, -41, -25, -8, 9, 26, 42,
    58, 73, 86, 98, 108, 116, 122, 126, 127, 127,
    124, 119, 112, 103, 92, 79, 65, 50, 34, 17,
};

static const struct effect_stream effects[] = {
    {
        .effect_id = 0,
        .data = effect_0,
        .length = ARRAY_SIZE(effect_0),
        .play_rate_hz = 8000,
    },

    {
        .effect_id = 1,
        .data = effect_1,
        .length = ARRAY_SIZE(effect_1),
        .play_rate_hz = 8000,
    },
};

const struct effect_stream *get_effect_stream(uint32_t effect_id)
{
    int i;

    for (i = 0; i < ARRAY_SIZE(effects); i++) {
        if (effect_id == effects[i].effect_id)
            return &effects[i];
    }

    return NULL;
}