looper/loopClipUpdate.cpp at master · AnEntrypoint/looper · GitHub

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#include "Looper.h"
#include <circle/logger.h>

#define log_name "lclip"

#define FADE_BLOCK_INCREMENT (1.0/((double)CROSSFADE_BLOCKS))
#define FADE_SAMPLE_INCREMENT (FADE_BLOCK_INCREMENT/((double)AUDIO_BLOCK_SAMPLES))

void loopClip::update(s32 *ip, s32 *op)
{
    s16 *rp = 0;
    s16 *pp_main = 0;
    s16 *pp_fade = 0;
    uint32_t use_play_block = m_play_block;

    switch (m_state)
    {
        case CS_RECORDING:
        case CS_FINISHING:
            rp = getBlock(m_record_block);
            break;
        case CS_RECORDING_MAIN:
            // Record only, no playback during main recording phase to avoid read-write race
            rp = getBlock(m_record_block);
            break;
        case CS_RECORDING_TAIL:
            // Recording with playback feedback: write new input, play back completed blocks only
            rp = getBlock(m_record_block);
            if (m_record_block > 0)
                pp_main = getBlock(m_play_block);
            break;
        case CS_PLAYING:
            if (m_mark_point_active)
            {
                if (m_play_block == 0) m_play_block = m_mark_point;
                use_play_block = m_play_block - m_mark_point;
            }
            pp_main = getBlock(m_play_block);
            break;
        case CS_LOOPING:
            if (m_mark_point_active)
            {
                if (m_play_block == 0) m_play_block = m_mark_point;
                use_play_block = m_play_block - m_mark_point;
            }
            pp_main = getBlock(m_play_block);
            pp_fade = getBlock(m_crossfade_start + m_crossfade_offset);
            break;
        case CS_STOPPING:
            pp_fade = getBlock(m_crossfade_start + m_crossfade_offset);
            break;
        default:
            break;
    }

    bool fade_in = (pp_main && use_play_block < CROSSFADE_BLOCKS);

    s16 tmp_L[AUDIO_BLOCK_SAMPLES] = {0};
    s16 tmp_R[AUDIO_BLOCK_SAMPLES] = {0};

    for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++)
    {
        if (rp) {
            *rp++ = *ip++;  // L
            *rp++ = *ip++;  // R
        }
    }

    double i_fade = 1.0;
    double o_fade = 1.0;
    if (fade_in)
        i_fade = ((double)use_play_block) * FADE_BLOCK_INCREMENT;
    if (pp_fade)
        o_fade = ((double)(CROSSFADE_BLOCKS - m_crossfade_offset)) * FADE_BLOCK_INCREMENT;

    if (!m_mute)
    {
        for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++)
        {
            // Read L and R from playback pointers (interleaved)
            if (pp_main)
            {
                double val = *pp_main++ * m_volume;
                if (fade_in) { val *= i_fade; i_fade += FADE_SAMPLE_INCREMENT; }
                tmp_L[i] += (s16)(val + (val >= 0 ? 0.5 : -0.5));
            }
            if (pp_main)
            {
                double val = *pp_main++ * m_volume;
                tmp_R[i] += (s16)(val + (val >= 0 ? 0.5 : -0.5));
            }

            if (pp_fade)
            {
                double val = *pp_fade++ * m_volume * o_fade;
                tmp_L[i] += (s16)(val + (val >= 0 ? 0.5 : -0.5));
            }
            if (pp_fade)
            {
                double val = *pp_fade++ * m_volume * o_fade;
                tmp_R[i] += (s16)(val + (val >= 0 ? 0.5 : -0.5));
                o_fade -= FADE_SAMPLE_INCREMENT;
            }
        }
    }

    for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
        op[i*LOOPER_NUM_CHANNELS] += (s32)tmp_L[i];
        op[i*LOOPER_NUM_CHANNELS+1] += (s32)tmp_R[i];
    }

    if (rp)
    {
        m_record_block++;
        if (m_state == CS_RECORDING && m_record_block >= CROSSFADE_BLOCKS)
            m_state = CS_RECORDING_MAIN;

        if ((m_state == CS_RECORDING_MAIN) &&
            m_quantizeTarget > 0 &&
            m_record_block >= m_quantizeTarget)
        {
            u32 trim = m_quantizeTarget;
            bool play = m_quantizeWillPlay;
            m_quantizeTarget = 0;
            m_quantizeWillPlay = false;
            _startEndingRecording(trim, play);
        }
        else if ((m_state == CS_RECORDING_TAIL || m_state == CS_FINISHING) &&
            m_record_block >= m_max_blocks)
        {
            _finishRecording();
        }
    }

    if (pp_fade)
    {
        m_crossfade_offset++;
        if (m_crossfade_offset == CROSSFADE_BLOCKS)
        {
            if (m_state == CS_LOOPING)
            {
                m_state = CS_PLAYING;
                m_crossfade_start = 0;
                m_crossfade_offset = 0;
                m_pLoopTrack->incDecRunning(-1);
            }
            else
            {
                _endFadeOut();
            }
        }
    }

    if (pp_main)
    {
        u32 masterLen = pTheLoopMachine->m_masterLoopBlocks;
        if (masterLen > 0)
        {
            u32 next = ((pTheLoopMachine->m_masterPhase - m_recordStartPhaseOffset) % m_num_blocks + m_num_blocks) % m_num_blocks;
            bool wrapped = (next == 0) && (m_play_block > 0);
            if (wrapped && m_state == CS_PLAYING)
            {
                m_state = CS_LOOPING;
                m_crossfade_start = m_num_blocks;
                m_crossfade_offset = 0;
                m_pLoopTrack->incDecRunning(1);
            }
            m_play_block = next;
        }
        else
        {
            m_play_block++;
            if (m_play_block == m_num_blocks) _startCrossFade();
        }
    }
}