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https://github.com/alsa-project/alsa-utils
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BAT: Add spectrum analysis functions
Add functions that detecting signal frequency through spectrum analyzing. Signed-off-by: Lu, Han <han.lu@intel.com> Signed-off-by: Liam Girdwood <liam.r.girdwood@intel.com> Signed-off-by: Bernard Gautier <bernard.gautier@intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Lu, Han
Takashi Iwai
parent
6c4c5e51fa
commit
d727c9d90e
2 changed files with 330 additions and 0 deletions
314
bat/analyze.c
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314
bat/analyze.c
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/*
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* Copyright (C) 2013-2015 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <math.h>
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#include <fftw3.h>
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#include "aconfig.h"
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#include "gettext.h"
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#include "common.h"
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static void check_amplitude(struct bat *bat, double *buf)
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{
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double sum, average, amplitude;
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int i, percent;
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/* calculate average value */
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for (i = 0, sum = 0.0; i < bat->frames; i++)
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sum += buf[i];
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average = sum / bat->frames;
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/* calculate peak-to-average amplitude */
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for (i = 0, sum = 0.0; i < bat->frames; i++)
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sum += abs(buf[i] - average);
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amplitude = sum / bat->frames * M_PI / 2.0;
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/* calculate amplitude percentage against full range */
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percent = amplitude * 100 / ((1 << ((bat->sample_size << 3) - 1)) - 1);
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fprintf(bat->log, _("Amplitude: %.1f; Percentage: [%d]\n"),
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amplitude, percent);
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if (percent < 0)
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fprintf(bat->err, _("ERROR: Amplitude can't be negative!\n"));
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else if (percent < 1)
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fprintf(bat->err, _("WARNING: Signal too weak!\n"));
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else if (percent > 100)
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fprintf(bat->err, _("WARNING: Signal overflow!\n"));
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}
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/**
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*
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* @return 0 if peak detected at right frequency,
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* 1 if peak detected somewhere else
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* 2 if DC detected
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*/
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int check_peak(struct bat *bat, struct analyze *a, int end, int peak, float hz,
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float mean, float p, int channel, int start)
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{
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int err;
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float hz_peak = (float) (peak) * hz;
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float delta_rate = DELTA_RATE * bat->target_freq[channel];
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float delta_HZ = DELTA_HZ;
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float tolerance = (delta_rate > delta_HZ) ? delta_rate : delta_HZ;
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fprintf(bat->log, _("Detected peak at %2.2f Hz of %2.2f dB\n"), hz_peak,
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10.0 * log10(a->mag[peak] / mean));
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fprintf(bat->log, _(" Total %3.1f dB from %2.2f to %2.2f Hz\n"),
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10.0 * log10(p / mean), start * hz, end * hz);
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if (hz_peak < DC_THRESHOLD) {
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fprintf(bat->err, _(" WARNING: Found low peak %2.2f Hz,"),
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hz_peak);
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fprintf(bat->err, _(" very close to DC\n"));
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err = FOUND_DC;
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} else if (hz_peak < bat->target_freq[channel] - tolerance) {
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fprintf(bat->err, _(" FAIL: Peak freq too low %2.2f Hz\n"),
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hz_peak);
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err = FOUND_WRONG_PEAK;
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} else if (hz_peak > bat->target_freq[channel] + tolerance) {
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fprintf(bat->err, _(" FAIL: Peak freq too high %2.2f Hz\n"),
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hz_peak);
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err = FOUND_WRONG_PEAK;
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} else {
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fprintf(bat->log, _(" PASS: Peak detected"));
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fprintf(bat->log, _(" at target frequency\n"));
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err = 0;
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}
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return err;
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}
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/**
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* Search for main frequencies in fft results and compare it to target
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*/
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static int check(struct bat *bat, struct analyze *a, int channel)
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{
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float hz = 1.0 / ((float) bat->frames / (float) bat->rate);
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float mean = 0.0, t, sigma = 0.0, p = 0.0;
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int i, start = -1, end = -1, peak = 0, signals = 0;
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int err = 0, N = bat->frames / 2;
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/* calculate mean */
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for (i = 0; i < N; i++)
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mean += a->mag[i];
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mean /= (float) N;
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/* calculate standard deviation */
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for (i = 0; i < N; i++) {
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t = a->mag[i] - mean;
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t *= t;
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sigma += t;
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}
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sigma /= (float) N;
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sigma = sqrtf(sigma);
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/* clip any data less than k sigma + mean */
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for (i = 0; i < N; i++) {
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if (a->mag[i] > mean + bat->sigma_k * sigma) {
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/* find peak start points */
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if (start == -1) {
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start = peak = end = i;
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signals++;
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} else {
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if (a->mag[i] > a->mag[peak])
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peak = i;
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end = i;
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}
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p += a->mag[i];
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} else if (start != -1) {
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/* Check if peak is as expected */
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err |= check_peak(bat, a, end, peak, hz, mean,
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p, channel, start);
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end = start = -1;
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if (signals == MAX_PEAKS)
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break;
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}
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}
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if (signals == 0)
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err = -ENOPEAK; /* No peak detected */
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else if ((err == FOUND_DC) && (signals == 1))
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err = -EONLYDC; /* Only DC detected */
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else if ((err & FOUND_WRONG_PEAK) == FOUND_WRONG_PEAK)
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err = -EBADPEAK; /* Bad peak detected */
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else
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err = 0; /* Correct peak detected */
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fprintf(bat->log, _("Detected at least %d signal(s) in total\n"),
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signals);
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return err;
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}
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static void calc_magnitude(struct bat *bat, struct analyze *a, int N)
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{
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double r2, i2;
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int i;
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for (i = 1; i < N / 2; i++) {
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r2 = a->out[i] * a->out[i];
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i2 = a->out[N - i] * a->out[N - i];
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a->mag[i] = sqrtf(r2 + i2);
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}
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a->mag[0] = 0.0;
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}
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static int find_and_check_harmonics(struct bat *bat, struct analyze *a,
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int channel)
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{
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fftw_plan p;
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int err = -ENOMEM, N = bat->frames;
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/* Allocate FFT buffers */
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a->in = (double *) fftw_malloc(sizeof(double) * bat->frames);
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if (a->in == NULL)
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goto out1;
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a->out = (double *) fftw_malloc(sizeof(double) * bat->frames);
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if (a->out == NULL)
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goto out2;
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a->mag = (double *) fftw_malloc(sizeof(double) * bat->frames);
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if (a->mag == NULL)
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goto out3;
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/* create FFT plan */
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p = fftw_plan_r2r_1d(N, a->in, a->out, FFTW_R2HC,
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FFTW_MEASURE | FFTW_PRESERVE_INPUT);
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if (p == NULL)
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goto out4;
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/* convert source PCM to doubles */
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bat->convert_sample_to_double(a->buf, a->in, bat->frames);
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/* check amplitude */
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check_amplitude(bat, a->in);
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/* run FFT */
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fftw_execute(p);
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/* FFT out is real and imaginary numbers - calc magnitude for each */
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calc_magnitude(bat, a, N);
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/* check data */
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err = check(bat, a, channel);
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fftw_destroy_plan(p);
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out4:
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fftw_free(a->mag);
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out3:
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fftw_free(a->out);
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out2:
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fftw_free(a->in);
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out1:
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return err;
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}
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/**
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* Convert interleaved samples from channels in samples from a single channel
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*/
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static int reorder_data(struct bat *bat)
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{
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char *p, *new_bat_buf;
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int ch, i, j;
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if (bat->channels == 1)
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return 0; /* No need for reordering */
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p = malloc(bat->frames * bat->frame_size);
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new_bat_buf = p;
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if (p == NULL)
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return -ENOMEM;
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for (ch = 0; ch < bat->channels; ch++) {
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for (j = 0; j < bat->frames; j++) {
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for (i = 0; i < bat->sample_size; i++) {
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*p++ = ((char *) (bat->buf))[j * bat->frame_size
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+ ch * bat->sample_size + i];
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}
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}
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}
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free(bat->buf);
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bat->buf = new_bat_buf;
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return 0;
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}
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int analyze_capture(struct bat *bat)
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{
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int err = 0;
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size_t items;
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int c;
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struct analyze a;
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fprintf(bat->log, _("\nBAT analysis: signal has %d frames at %d Hz,"),
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bat->frames, bat->rate);
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fprintf(bat->log, _(" %d channels, %d bytes per sample.\n"),
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bat->channels, bat->sample_size);
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bat->buf = malloc(bat->frames * bat->frame_size);
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if (bat->buf == NULL)
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return -ENOMEM;
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bat->fp = fopen(bat->capture.file, "rb");
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if (bat->fp == NULL) {
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fprintf(bat->err, _("Cannot open file for capture: %s %d\n"),
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bat->capture.file, -errno);
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err = -errno;
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goto exit1;
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}
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/* Skip header */
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err = read_wav_header(bat, bat->capture.file, bat->fp, true);
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if (err != 0)
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goto exit2;
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items = fread(bat->buf, bat->frame_size, bat->frames, bat->fp);
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if (items != bat->frames) {
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err = -EIO;
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goto exit2;
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}
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err = reorder_data(bat);
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if (err != 0)
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goto exit2;
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for (c = 0; c < bat->channels; c++) {
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fprintf(bat->log, _("\nChannel %i - "), c + 1);
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fprintf(bat->log, _("Checking for target frequency %2.2f Hz\n"),
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bat->target_freq[c]);
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a.buf = bat->buf +
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c * bat->frames * bat->frame_size
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/ bat->channels;
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err = find_and_check_harmonics(bat, &a, c);
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}
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exit2:
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fclose(bat->fp);
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exit1:
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free(bat->buf);
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return err;
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}
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16
bat/analyze.h
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16
bat/analyze.h
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@ -0,0 +1,16 @@
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/*
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* Copyright (C) 2013-2015 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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int analyze_capture(struct bat *);
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