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82 lines
3.0 KiB
C
82 lines
3.0 KiB
C
/*
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* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2013-2025 OpenMV, LLC.
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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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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*
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* Averaging utility functions.
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*/
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#include "average.h"
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#include <string.h>
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void rgb_moving_average_init(rgb_moving_average_t *ma, uint32_t max_ms,
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size_t size, rgb_moving_average_val_t *buffer) {
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memset(ma, 0, sizeof(rgb_moving_average_t));
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ma->size = size;
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ma->max_ms = max_ms;
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ma->buffer = buffer;
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}
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void rgb_moving_average_update(rgb_moving_average_t *ma,
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uint32_t *r_value, uint32_t *g_value, uint32_t *b_value,
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uint32_t current_ms) {
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if (!ma->size) {
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return;
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}
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// Drop if the buffer is full and all values older than max_ms (handles wrap-around correctly).
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while (ma->count == ma->size ||
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(ma->count > 0 && (current_ms - ma->buffer[ma->head].timestamp_ms) > ma->max_ms)) {
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rgb_moving_average_val_t *val = &ma->buffer[ma->head];
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ma->r_sum -= val->r_value;
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ma->g_sum -= val->g_value;
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ma->b_sum -= val->b_value;
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ma->head = (ma->head + 1) % ma->size;
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ma->count--;
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}
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// Add the new value.
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rgb_moving_average_val_t *val = &ma->buffer[ma->tail];
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val->r_value = *r_value;
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val->g_value = *g_value;
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val->b_value = *b_value;
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val->timestamp_ms = current_ms;
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ma->tail = (ma->tail + 1) % ma->size;
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ma->count++;
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ma->r_sum += val->r_value;
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ma->g_sum += val->g_value;
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ma->b_sum += val->b_value;
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// Return the current average.
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*r_value = (ma->r_sum / ma->count);
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*g_value = (ma->g_sum / ma->count);
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*b_value = (ma->b_sum / ma->count);
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}
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void rgb_moving_average_get(rgb_moving_average_t *ma, uint32_t *r_value, uint32_t *g_value, uint32_t *b_value) {
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if (!ma->size || ma->count == 0) {
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return;
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}
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*r_value = (ma->r_sum / ma->count);
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*g_value = (ma->g_sum / ma->count);
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*b_value = (ma->b_sum / ma->count);
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}
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