Marcel Licence
531 lines
11 KiB
Arduino
531 lines
11 KiB
Arduino
/*
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* this file contains the code of the multitrack looper
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*
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* Author: Marcel Licence
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*/
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/*
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* MAX_LOOP can only increased by decreasing TRACK_CNT (track count)
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*
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* for example using only 2 tracks will allow MAX_LOOP to be set to 1026492
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* all PSRAM memory will be used
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* if values are set to big the startup of the firmware will fail
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*/
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#define MAX_LOOP 513246
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#define TRACK_CNT 4
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int16_t *loopLine[TRACK_CNT];
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float loopGainOut[TRACK_CNT];
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float loopGainIn;
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float loopPanLCH[TRACK_CNT];
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float loopPanRCH[TRACK_CNT];
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bool loopActive[TRACK_CNT];
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bool loopContainsData[TRACK_CNT];
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float loopMeter[TRACK_CNT + 2];
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uint32_t loopErase[TRACK_CNT] ;
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uint8_t loopInCh = 0xFF;
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uint32_t loopMax = MAX_LOOP;
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uint32_t loopMaxCalc = MAX_LOOP;
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/*
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* init of the multitrack looper
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*/
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void Loop_init(void)
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{
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psramInit();
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Serial.printf("Total PSRAM: %d\n", ESP.getPsramSize());
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Serial.printf("Free PSRAM: %d\n", ESP.getFreePsram());
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for (int n = 0; n < TRACK_CNT; n++)
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{
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loopLine[n] = (int16_t *)ps_malloc(sizeof(int16_t) * MAX_LOOP);
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if (loopLine[n] == NULL)
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{
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/* when you see the message the count of TRACK_CNT is too high or MAX_LOOP is too big */
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Serial.printf("not enough memory!\n");
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return;
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}
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else
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{
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for (int i = 0; i < MAX_LOOP; i++)
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{
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loopLine[n][i] = 0.0f;
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}
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Serial.printf("done!..\n");
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}
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loopGainOut[n] = 1.0f;
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loopPanLCH[n] = 1.0f;
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loopPanRCH[n] = 1.0f;
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Serial.printf("- Free PSRAM: %d\n", ESP.getFreePsram());
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}
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Serial.printf("Total PSRAM: %d\n", ESP.getPsramSize());
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Serial.printf("Free PSRAM: %d\n", ESP.getFreePsram());
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loopGainIn = 0.0f;
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loopInCh = 0;
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Serial.printf("Loop Max Length: %0.0f seconds\n", ((float)MAX_LOOP) / 44100.0f);
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Loop_CompleteReset();
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}
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uint32_t loopLen = (MAX_LOOP - 2);
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uint32_t loopIn = 0;
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float loop_f = 0;
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float loopSpeed = 1.0f;
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uint32_t loopSubCnt = 0;
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#define absf(a) (a>0)?a:(-a)
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/*
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* this function processes the input audio and mixes also the audio output to the signal
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*/
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void Loop_Process(float *signal_l, float *signal_r)
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{
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float tempL = 0.0f, tempR = 0.0f;
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loopMeter[TRACK_CNT] = max(absf(*signal_l), loopMeter[TRACK_CNT] );
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loopMeter[TRACK_CNT] = max(absf(*signal_r), loopMeter[TRACK_CNT] );
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loopSubCnt++;
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if (Loop_AnyTrackActive() == false)
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{
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loopLen = (MAX_LOOP - 2);
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loopIn = 0;
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loop_f = 0.0f;
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}
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/*
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* audio through
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*/
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*signal_l *= loopGainIn;
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*signal_r *= loopGainIn;
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tempL = *signal_l;
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tempR = *signal_r;
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for (int n = 0; n < TRACK_CNT; n++)
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{
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/*
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* do erasing first if active
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* to avoid getting any signal out of the track
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*/
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if (loopErase[n] != 0xFFFFFFFFUL)
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{
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loopLine[n][loopIn] = 0;
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}
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if (n == loopInCh)
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{
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loopContainsData[loopInCh] = true;
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loopLine[loopInCh][loopIn] += (((float)0x8000) * *signal_l * loopPanLCH[loopInCh]);
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loopLine[loopInCh][loopIn] += (((float)0x8000) * *signal_r * loopPanRCH[loopInCh]);
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}
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/*
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* calc float value for later use
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*/
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float loopOut = ((float)loopLine[n][loopIn]) / ((float)0x8000);
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/*
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* update the vu meter value
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*/
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loopMeter[n] = max(absf(loopOut), loopMeter[n]);
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/*
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* playback only if active
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*/
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if (loopActive[n])
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{
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tempL += loopGainOut[n] * loopOut * loopPanLCH[n];
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tempR += loopGainOut[n] * loopOut * loopPanRCH[n];
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}
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#if 0 /* I don't remember the use of this */
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delayLine_l[delayIn] += delayLine_l[loopOut] * delayFeedback;
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delayLine_r[delayIn] += delayLine_r[loopOut] * delayFeedback;
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#endif
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}
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loop_f += loopSpeed;
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if (loop_f >= loopMax)
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{
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loop_f -= loopMax;
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}
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loopIn = loop_f;
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for (int n = 0; n < TRACK_CNT; n++)
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{
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/* stop erasing when final position has been reached */
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if (loopErase[n] == loopIn)
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{
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loopErase[n] = 0xFFFFFFFFUL;
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}
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}
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*signal_l = tempL;
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*signal_r = tempR;
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/*
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* get max value of left and right channel
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*/
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loopMeter[TRACK_CNT + 1] = max(absf(*signal_l), loopMeter[TRACK_CNT + 1] );
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loopMeter[TRACK_CNT + 1] = max(absf(*signal_r), loopMeter[TRACK_CNT + 1] );
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Loop_ProcessButton();
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}
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bool reset_active = false;
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uint32_t reset_active_time = 0;
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/*
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* reset the looper to initial state
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*/
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void Loop_CompleteReset(void)
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{
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loopMax = MAX_LOOP;
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loopIn = 0;
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loop_f = 0;
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loopSpeed = 1.0f;
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loopInCh = 0xFF;
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for (int channel = 0; channel < TRACK_CNT; channel ++)
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{
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Status_ValueChangedInt("LoopTrackErase", channel);
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for (int n = 0; n < MAX_LOOP; n++)
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{
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loopLine[channel][n] = 0.0f;
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}
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loopActive[channel] = false;
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loopContainsData[channel] = false;
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}
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memset(loopErase, 0xFF, sizeof(loopErase));
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}
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void Loop_ProcessButton(void)
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{
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if (reset_active)
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{
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reset_active_time++;
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if (reset_active_time > 44100 * 3)
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{
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Loop_CompleteReset();
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reset_active = 0;
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}
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}
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else
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{
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reset_active_time = 0;
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}
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}
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void Loop_ResetToStart(uint8_t channel, float value)
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{
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if (value > 0)
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{
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reset_active = true;
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loop_f = 0;
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}
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else
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{
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reset_active = 0;
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}
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}
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void Loop_PlayNormal(uint8_t channel, float value)
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{
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if (value > 0)
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{
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loop_f = loopIn;
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loopSpeed = 1.0f;
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}
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}
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float getLoopSpeed(void)
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{
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return loopSpeed;
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}
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void Loop_SetLength(uint8_t channel, float value)
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{
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if (value > 0)
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{
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loopMax = loop_f;
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}
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}
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void Loop_SetEndByTempo(void)
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{
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loopMaxCalc = loop_f;
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loop_f = 0;
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}
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void Loop_SetSpeed(uint8_t channel, float value)
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{
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value = pow(2.0f, 4.0f * (value - 0.5));
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loopSpeed = value;
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Status_ValueChangedFloat("LoopSpeed", loopSpeed);
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}
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void Loop_StartAll(uint8_t channel, float value)
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{
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if (value > 0)
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{
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for (int n = 0; n < TRACK_CNT; n++)
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{
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if (loopContainsData[n])
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{
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loopActive[n] = true;
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}
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}
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}
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}
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/*
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* this function will activate recording
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* or playback
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* or toggle between both modes
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*/
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void Loop_SelectTrack(uint8_t channel, float value)
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{
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if (value > 0)
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{
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if (channel < TRACK_CNT)
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{
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/*
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* count in if all empty
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*/
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if (Loop_AnyTrackActive() == false)
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{
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Click_StartFirst();
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}
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if (loopContainsData[channel] == false)
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{
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/*
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* in case of selecting an empty channel we switch always to record mode
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*/
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loopActive[channel] = true;
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loopInCh = channel;
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}
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else
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{
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if (loopActive[channel] == false)
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{
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/*
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* if we have data in it but track is not active we go into playback
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*/
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loopInCh = 0xFF;
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loopActive[channel] = true;
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}
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else
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{
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/*
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* if still active we switch between playback and overdub/record
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*/
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if (loopInCh == channel)
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{
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/*
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* still selected going to playback
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*/
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loopInCh = 0xFF;
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}
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else
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{
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loopInCh = channel;
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Status_ValueChangedInt("LoopRecTrack", loopInCh);
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}
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}
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}
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}
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}
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}
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void Loop_StopChannel(uint8_t channel, float value)
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{
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if (channel < TRACK_CNT)
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{
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loopActive[channel] = false;
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/* stop recording if rec is active */
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if (channel == loopInCh)
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{
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loopInCh = 0xFF;
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}
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}
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}
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void Loop_Stop(uint8_t channel, float value)
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{
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if (value > 0)
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{
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for (int n = 0; n < TRACK_CNT; n ++)
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{
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loopActive[n] = false;
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}
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}
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}
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/*
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* erase track will be activated
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* a complete clear in this call was too slow
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*/
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void Loop_EraseTrack(uint8_t channel, float value)
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{
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if (channel < TRACK_CNT)
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{
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if (value > 0)
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{
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Status_ValueChangedInt("LoopEraseTrack", channel);
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loopErase[channel] = loop_f;
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loopContainsData[channel] = false;
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if (channel != loopInCh)
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{
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loopActive[channel] = false;
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}
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}
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}
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}
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void Loop_SetChannelGainIn(uint8_t channel, float value)
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{
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loopGainIn = value;
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Status_ValueChangedFloat("LoopGainIn", loopGainIn);
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}
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void Loop_SetChannelGainOut(uint8_t channel, float value)
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{
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if (channel < TRACK_CNT)
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{
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loopGainOut[channel] = value;
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//Serial.printf("Ch[%d].outLevel: %0.2f\n", channel, value);
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Status_ValueChangedFloat("LoopTrackLevel", value); // todo track number is missing
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}
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}
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void Loop_SetChannelPan(uint8_t channel, float value)
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{
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if (channel < TRACK_CNT)
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{
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loopPanLCH[channel] = value < 0.5 ? 1 : 2 * (0.5 - (value - 0.5));
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loopPanRCH[channel] = value > 0.5 ? 1 : 2 * (value);
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//Serial.printf("Ch[%d].Pan: %0.2f:%0.2f\n", channel, loopPanLCH[channel], loopPanRCH[channel]);
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Status_ValueChangedInt("LoopTrackPan", channel); // todo track number is missing
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}
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}
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void Loop_JumpPosQuarter(uint8_t quarter, float value)
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{
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if (value > 0)
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{
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if (loopMax < loopMaxCalc)
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{
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loop_f = ((float)loopMax) * ((float)quarter) * (0.25f);
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}
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else
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{
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loop_f = ((float)loopMaxCalc) * ((float)quarter) * (0.25f);
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}
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}
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}
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void Loop_NoteOn(uint8_t ch, uint8_t note)
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{
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if (ch == 15)
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{
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loop_f = 0;
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loopSpeed = pow(2.0f, 1.0f / 12.0f * (note - 69)); /* this would be the a as middle */
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}
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}
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float *Loop_GetMeterValues(void)
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{
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return loopMeter;
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}
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float Loop_GetRelPos(void)
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{
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return loop_f / ((float)MAX_LOOP);
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}
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float Loop_GetRelLen(void)
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{
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return loopMax / ((float)MAX_LOOP);
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}
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float Loop_GetMaxRecLengthSeconds(void)
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{
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return ((float)MAX_LOOP) / 44100.0f;
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}
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uint8_t Loop_GetRecTrack(void)
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{
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return loopInCh;
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}
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bool Loop_IsTrackActive(uint8_t channel)
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{
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if (channel < TRACK_CNT)
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{
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return loopActive[channel];
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}
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else
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{
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return false;
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}
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}
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bool Loop_IsUnderErase(uint8_t channel)
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{
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if (channel < TRACK_CNT)
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{
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return loopErase[channel] != 0xFFFFFFFFUL;
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}
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else
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{
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return false;
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}
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}
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bool Loop_TrackContainsData(uint8_t channel)
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{
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if (channel < TRACK_CNT)
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{
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return loopContainsData[channel];
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}
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else
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{
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return false;
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}
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}
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bool Loop_AnyTrackActive(void)
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{
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for (int n = 0; n < TRACK_CNT; n++)
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{
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if (loopActive[n])
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{
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return true;
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}
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if (loopErase[n] != 0xFFFFFFFFUL)
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{
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return true;
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}
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}
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return false;
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}
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