60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
#include <math.h>
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#include "noise_tracker.h"
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#include "audio_dump.h"
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#include "hal_trace.h"
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//#define NT_DUMP_AUDIO_DATA
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#define SQUARE(x) ((x) * (x))
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#define LIN2DB(x) (10.f * log10f(x))
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#define NORMAL_SCALE (1.f/32768/32768)
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static NoiseTrackerCallback _callback;
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static int _threshold;
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static int _ch_num;
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static float vec_power(int16_t *buf, uint32_t len, int stride)
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{
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float sum = 0.f;
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for (uint32_t i = 0; i < len; i += stride)
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sum += SQUARE(buf[i]);
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return sum;
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}
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void noise_tracker_init(NoiseTrackerCallback cb, int ch_num, int threshold)
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{
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_callback = cb;
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_threshold = threshold;
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_ch_num = ch_num;
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#ifdef NT_DUMP_AUDIO_DATA
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audio_dump_init(240 * ANC_NOISE_TRACKER_CHANNEL_NUM, sizeof(int16_t), 1);
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#endif
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}
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void noise_tracker_process(int16_t *buf, uint32_t len)
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{
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float scale = 1.f / len * NORMAL_SCALE;
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float maxPowerdB = -90;
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#ifdef NT_DUMP_AUDIO_DATA
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audio_dump_clear_up();
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audio_dump_add_channel_data(0, buf, len);
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audio_dump_run();
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#endif
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for (int i = 0; i < _ch_num; i++) {
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float power = vec_power(&buf[i], len, _ch_num) * scale;
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float powerdB = LIN2DB(power);
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maxPowerdB = MAX(maxPowerdB, powerdB);
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//TRACE(3,"[%s] powerdB ch[%d] = %d", __FUNCTION__, i, (int)powerdB);
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}
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if (maxPowerdB > _threshold) {
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_callback(maxPowerdB);
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}
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}
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