mirror of
https://github.com/sle118/squeezelite-esp32.git
synced 2025-12-06 19:47:02 +03:00
229 lines
7.3 KiB
C
229 lines
7.3 KiB
C
/*
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* Squeezelite for esp32
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*
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* (c) Philippe G. 2020, philippe_44@outlook.com
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*
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* This software is released under the MIT License.
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* https://opensource.org/licenses/MIT
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*
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*/
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#include "math.h"
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#include "platform_config.h"
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#include "squeezelite.h"
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#include "equalizer.h"
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#include "esp_equalizer.h"
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#define EQ_BANDS 10
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static log_level loglevel = lINFO;
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static EXT_RAM_ATTR struct {
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void *handle;
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float loudness, volume;
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uint32_t samplerate;
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float gain[EQ_BANDS], loudness_gain[EQ_BANDS];
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bool update;
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} equalizer;
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#define POLYNOME_COUNT 6
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static const float loudness_envelope_coefficients[EQ_BANDS][POLYNOME_COUNT] = {
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{5.5169301499257067e+001, 6.3671410796029004e-001,
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-4.2663226432095233e-002, 8.1063072336581246e-004,
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-7.3621858933917722e-006, 2.5349489594339575e-008},
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{3.7716143859944118e+001, 1.2355293276538579e+000,
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-6.6435374582217863e-002, 1.2976763440259382e-003,
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-1.1978732496353172e-005, 4.1664114634622593e-008},
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{2.5103632377146837e+001, 1.3259150615414637e+000,
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-6.6332442135695099e-002, 1.2845279812261677e-003,
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-1.1799885217545631e-005, 4.0925911584040685e-008},
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{1.3159168212144563e+001, 8.8149357628440639e-001,
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-4.0384121097225931e-002, 7.3843501027501322e-004,
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-6.5508794453097008e-006, 2.2221997141120518e-008},
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{5.1337853800151700e+000, 4.0817077967582394e-001,
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-1.4107826528626457e-002, 1.5251066311713760e-004,
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-3.6689819583740298e-007, -2.0390798774727989e-009},
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{3.1432364156464315e-001, 9.1260548140023004e-002,
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-3.5012124633183438e-004, -8.6023911664606992e-005,
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1.6785606828245921e-006, -8.8269731094371646e-009},
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{-4.0965062397075833e+000, 1.3667010948271402e-001,
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2.4775896786988390e-004, -9.6620399661858641e-005,
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1.7733690952379155e-006, -9.1583104942496635e-009},
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{-9.0275786029994176e+000, 2.6226938845184250e-001,
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-6.5777547972402156e-003, 1.0045957188977551e-004,
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-7.8851000325128971e-007, 2.4639885209682384e-009},
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{-4.4275018199195815e+000, 4.5399572638241725e-001,
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-2.4034902766833462e-002, 5.9828953622534668e-004,
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-6.2893971217140864e-006, 2.3133296592719627e-008},
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{1.4243299202697818e+001, 3.6984458807056630e-001,
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-3.0413994109395680e-002, 7.6700105080386904e-004,
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-8.2777185209388079e-006, 3.1352890650784970e-008} };
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/****************************************************************************************
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* calculate loudness gains
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*/
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static void calculate_loudness(void) {
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char trace[EQ_BANDS * 5 + 1];
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size_t n = 0;
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for (int i = 0; i < EQ_BANDS; i++) {
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for (int j = 0; j < POLYNOME_COUNT && equalizer.loudness != 0; j++) {
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equalizer.loudness_gain[i] +=
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loudness_envelope_coefficients[i][j] * pow(equalizer.volume, j);
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}
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equalizer.loudness_gain[i] *= equalizer.loudness / 2;
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n += sprintf(trace + n, "%.2g%c", equalizer.loudness_gain[i], i < EQ_BANDS ? ',' : '\0');
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}
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LOG_INFO("loudness %s", trace);
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}
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/****************************************************************************************
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* initialize equalizer
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*/
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void equalizer_init(void) {
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// handle equalizer
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char *config = config_alloc_get(NVS_TYPE_STR, "equalizer");
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char *p = strtok(config, ", !");
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for (int i = 0; p && i < EQ_BANDS; i++) {
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equalizer.gain[i] = atoi(p);
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p = strtok(NULL, ", :");
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}
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free(config);
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// handle loudness
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config = config_alloc_get(NVS_TYPE_STR, "loudness");
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equalizer.loudness = atof(config) / 10.0;
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free(config);
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}
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/****************************************************************************************
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* close equalizer
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*/
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void equalizer_close(void) {
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if (equalizer.handle) {
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esp_equalizer_uninit(equalizer.handle);
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equalizer.handle = NULL;
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}
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}
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/****************************************************************************************
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* change sample rate
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*/
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void equalizer_set_samplerate(uint32_t samplerate) {
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#if BYTES_PER_FRAME == 4
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if (equalizer.samplerate != samplerate) equalizer_close();
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equalizer.samplerate = samplerate;
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equalizer.update = true;
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LOG_INFO("equalizer sample rate %u", samplerate);
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#else
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LOG_INFO("no equalizer with 32 bits samples");
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#endif
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}
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/****************************************************************************************
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* get volume update and recalculate loudness according to
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*/
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void equalizer_set_volume(unsigned left, unsigned right) {
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#if BYTES_PER_FRAME == 4
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float volume = (left + right) / 2;
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// do classic dB conversion and scale it 0..100
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if (volume) volume = log2(volume);
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volume = volume / 16.0 * 100.0;
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// LMS has the bad habit to send multiple volume commands
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if (volume != equalizer.volume && equalizer.loudness) {
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equalizer.volume = volume;
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calculate_loudness();
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equalizer.update = true;
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}
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#endif
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}
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/****************************************************************************************
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* change gains from LMS
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*/
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void equalizer_set_gain(int8_t *gain) {
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#if BYTES_PER_FRAME == 4
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char config[EQ_BANDS * 4 + 1] = { };
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int n = 0;
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for (int i = 0; i < EQ_BANDS; i++) {
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equalizer.gain[i] = gain[i];
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n += sprintf(config + n, "%d,", gain[i]);
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}
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config[n-1] = '\0';
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config_set_value(NVS_TYPE_STR, "equalizer", config);
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// update only if something changed
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if (!memcmp(equalizer.gain, gain, EQ_BANDS)) equalizer.update = true;
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LOG_INFO("equalizer gain %s", config);
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#else
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LOG_INFO("no equalizer with 32 bits samples");
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#endif
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}
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/****************************************************************************************
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* change loudness from LMS
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*/
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void equalizer_set_loudness(uint8_t loudness) {
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#if BYTES_PER_FRAME == 4
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char p[4];
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itoa(loudness, p, 10);
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config_set_value(NVS_TYPE_STR, "loudness", p);
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// update loudness gains as a factor of loudness and volume
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if (equalizer.loudness != loudness / 10.0) {
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equalizer.loudness = loudness / 10.0;
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calculate_loudness();
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equalizer.update = true;
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}
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LOG_INFO("loudness %u", (unsigned) loudness);
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#else
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LOG_INFO("no equalizer with 32 bits samples");
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#endif
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}
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/****************************************************************************************
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* process equalizer
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*/
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void equalizer_process(uint8_t *buf, uint32_t bytes) {
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#if BYTES_PER_FRAME == 4
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// don't want to process with output locked, so take the small risk to miss one parametric update
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if (equalizer.update) {
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equalizer.update = false;
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if (equalizer.samplerate != 11025 && equalizer.samplerate != 22050 && equalizer.samplerate != 44100 && equalizer.samplerate != 48000) {
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LOG_WARN("equalizer only supports 11025, 22050, 44100 and 48000 sample rates, not %u", equalizer.samplerate);
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return;
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}
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if (!equalizer.handle && ((equalizer.handle = esp_equalizer_init(2, equalizer.samplerate, EQ_BANDS, 0)) == NULL)) {
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LOG_WARN("can't init equalizer");
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return;
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}
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bool active = false;
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for (int i = 0; i < EQ_BANDS; i++) {
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float gain = equalizer.gain[i] + equalizer.loudness_gain[i];
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esp_equalizer_set_band_value(equalizer.handle, gain, i, 0);
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esp_equalizer_set_band_value(equalizer.handle, gain, i, 1);
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active |= gain != 0;
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}
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// at the end do not activate equalizer if all gain are 0
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if (!active) equalizer_close();
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LOG_INFO("equalizer %s", active ? "actived" : "deactivated");
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}
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if (equalizer.handle) {
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esp_equalizer_process(equalizer.handle, buf, bytes, equalizer.samplerate, 2);
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}
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#endif
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} |