#include <PR/ultratypes.h>

#include "data.h"
#include "effects.h"
#include "external.h"
#include "heap.h"
#include "load.h"
#include "seqplayer.h"

#define PORTAMENTO_IS_SPECIAL(x) ((x).mode & 0x80)
#define PORTAMENTO_MODE(x) ((x).mode & ~0x80)
#define PORTAMENTO_MODE_1 1
#define PORTAMENTO_MODE_2 2
#define PORTAMENTO_MODE_3 3
#define PORTAMENTO_MODE_4 4
#define PORTAMENTO_MODE_5 5

void seq_channel_layer_process_script(struct SequenceChannelLayer *layer);
void sequence_channel_process_script(struct SequenceChannel *seqChannel);
u8 get_instrument(struct SequenceChannel *seqChannel, u8 instId, struct Instrument **instOut,
                  struct AdsrSettings *adsr);

void sequence_channel_init(struct SequenceChannel *seqChannel) {
    s32 i;

    seqChannel->enabled = FALSE;
    seqChannel->finished = FALSE;
    seqChannel->stopScript = FALSE;
    seqChannel->stopSomething2 = FALSE;
    seqChannel->hasInstrument = FALSE;
    seqChannel->stereoHeadsetEffects = FALSE;
    seqChannel->transposition = 0;
    seqChannel->largeNotes = FALSE;
    seqChannel->scriptState.depth = 0;
    seqChannel->volume = 1.0f;
    seqChannel->volumeScale = 1.0f;
    seqChannel->freqScale = 1.0f;
    seqChannel->pan = 0.5f;
    seqChannel->panChannelWeight = 1.0f;
    seqChannel->noteUnused = NULL;
    seqChannel->reverbVol = 0;
    seqChannel->notePriority = NOTE_PRIORITY_DEFAULT;
    seqChannel->delay = 0;
    seqChannel->adsr.envelope = gDefaultEnvelope;
    seqChannel->adsr.releaseRate = 0x20;
    seqChannel->adsr.sustain = 0;
    seqChannel->updatesPerFrameUnused = gAudioUpdatesPerFrame;
    seqChannel->vibratoRateTarget = 0x800;
    seqChannel->vibratoRateStart = 0x800;
    seqChannel->vibratoExtentTarget = 0;
    seqChannel->vibratoExtentStart = 0;
    seqChannel->vibratoRateChangeDelay = 0;
    seqChannel->vibratoExtentChangeDelay = 0;
    seqChannel->vibratoDelay = 0;

    for (i = 0; i < 8; i++) {
        seqChannel->soundScriptIO[i] = -1;
    }

    seqChannel->unused = FALSE;
    init_note_lists(&seqChannel->notePool);
}

s32 seq_channel_set_layer(struct SequenceChannel *seqChannel, s32 layerIndex) {
    struct SequenceChannelLayer *layer;

    if (seqChannel->layers[layerIndex] == NULL) {
        layer = audio_list_pop_back(&gLayerFreeList);
        seqChannel->layers[layerIndex] = layer;
        if (layer == NULL) {
            seqChannel->layers[layerIndex] = NULL;
            return -1;
        }
    } else {
        seq_channel_layer_note_decay(seqChannel->layers[layerIndex]);
    }

    layer = seqChannel->layers[layerIndex];
    layer->seqChannel = seqChannel;
    layer->adsr = seqChannel->adsr;
    layer->adsr.releaseRate = 0;
    layer->enabled = TRUE;
    layer->stopSomething = FALSE;
    layer->continuousNotes = FALSE;
    layer->finished = FALSE;
    layer->portamento.mode = 0;
    layer->scriptState.depth = 0;
    layer->status = SOUND_LOAD_STATUS_NOT_LOADED;
    layer->noteDuration = 0x80;
    layer->transposition = 0;
    layer->delay = 0;
    layer->duration = 0;
    layer->delayUnused = 0;
    layer->note = NULL;
    layer->instrument = NULL;
    layer->velocitySquare = 0.0f;
    layer->pan = 0.5f;
    return 0;
}

void seq_channel_layer_disable(struct SequenceChannelLayer *layer) {
    if (layer != NULL) {
        seq_channel_layer_note_decay(layer);
        layer->enabled = FALSE;
        layer->finished = TRUE;
    }
}

void seq_channel_layer_free(struct SequenceChannel *seqChannel, s32 layerIndex) {
    struct SequenceChannelLayer *layer = seqChannel->layers[layerIndex];

    if (layer != NULL) {
        struct AudioListItem *item = &layer->listItem;
        if (item->prev == NULL) {
            gLayerFreeList.prev->next = item;
            item->prev = gLayerFreeList.prev;
            item->next = &gLayerFreeList;
            gLayerFreeList.prev = item;
            gLayerFreeList.u.count++;
            item->pool = gLayerFreeList.pool;
        }
        seq_channel_layer_disable(layer);
        seqChannel->layers[layerIndex] = NULL;
    }
}

void sequence_channel_disable(struct SequenceChannel *seqChannel) {
    s32 i;
    for (i = 0; i < LAYERS_MAX; i++) {
        seq_channel_layer_free(seqChannel, i);
    }

    note_pool_clear(&seqChannel->notePool);
    seqChannel->enabled = FALSE;
    seqChannel->finished = TRUE;
}

struct SequenceChannel *allocate_sequence_channel(void) {
    s32 i;
    for (i = 0; i < ARRAY_COUNT(gSequenceChannels); i++) {
        if (gSequenceChannels[i].seqPlayer == NULL) {
            return gSequenceChannels + i;
        }
    }
    return &gSequenceChannelNone;
}

void sequence_player_init_channels(struct SequencePlayer *seqPlayer, u16 channelBits) {
    struct SequenceChannel *seqChannel;
    s32 i;

    for (i = 0; i < CHANNELS_MAX; i++) {
        if (channelBits & 1) {
            seqChannel = seqPlayer->channels[i];
            if (IS_SEQUENCE_CHANNEL_VALID(seqChannel) == TRUE && seqChannel->seqPlayer == seqPlayer) {
                sequence_channel_disable(seqChannel);
                seqChannel->seqPlayer = NULL;
            }
            seqChannel = allocate_sequence_channel();
            if (IS_SEQUENCE_CHANNEL_VALID(seqChannel) == FALSE) {
                eu_stubbed_printf_0("Audio:Track:Warning: No Free Notetrack\n");
                gAudioErrorFlags = i + 0x10000;
                seqPlayer->channels[i] = seqChannel;
            } else {
                sequence_channel_init(seqChannel);
                seqPlayer->channels[i] = seqChannel;
                seqChannel->seqPlayer = seqPlayer;
                seqChannel->bankId = seqPlayer->defaultBank[0];
                seqChannel->muteBehavior = seqPlayer->muteBehavior;
                seqChannel->noteAllocPolicy = seqPlayer->noteAllocPolicy;
            }
        }
        channelBits >>= 1;
    }
}

void sequence_player_disable_channels(struct SequencePlayer *seqPlayer, u16 channelBits) {
    struct SequenceChannel *seqChannel;
    s32 i;

    eu_stubbed_printf_0("SUBTRACK DIM\n");
    for (i = 0; i < CHANNELS_MAX; i++) {
        if (channelBits & 1) {
            seqChannel = seqPlayer->channels[i];
            if (IS_SEQUENCE_CHANNEL_VALID(seqChannel) == TRUE) {
                if (seqChannel->seqPlayer == seqPlayer) {
                    sequence_channel_disable(seqChannel);
                    seqChannel->seqPlayer = NULL;
                }
                seqPlayer->channels[i] = &gSequenceChannelNone;
            }
        }
        channelBits >>= 1;
    }
}

void sequence_channel_enable(struct SequencePlayer *seqPlayer, u8 channelIndex, void *script) {
    struct SequenceChannel *seqChannel = seqPlayer->channels[channelIndex];
    s32 i;
    if (IS_SEQUENCE_CHANNEL_VALID(seqChannel) == FALSE) {
    } else {
        seqChannel->enabled = TRUE;
        seqChannel->finished = FALSE;
        seqChannel->scriptState.depth = 0;
        seqChannel->scriptState.pc = script;
        seqChannel->delay = 0;
        for (i = 0; i < LAYERS_MAX; i++) {
            if (seqChannel->layers[i] != NULL) {
                seq_channel_layer_free(seqChannel, i);
            }
        }
    }
}

void sequence_player_disable(struct SequencePlayer *seqPlayer) {
    sequence_player_disable_channels(seqPlayer, 0xffff);
    note_pool_clear(&seqPlayer->notePool);
    seqPlayer->finished = TRUE;
    seqPlayer->enabled = FALSE;

    if (IS_SEQ_LOAD_COMPLETE(seqPlayer->seqId)) {
        gSeqLoadStatus[seqPlayer->seqId] = SOUND_LOAD_STATUS_DISCARDABLE;
    }

    if (IS_BANK_LOAD_COMPLETE(seqPlayer->defaultBank[0])) {
        gBankLoadStatus[seqPlayer->defaultBank[0]] = SOUND_LOAD_STATUS_DISCARDABLE;
    }

    // (Note that if this is called from alloc_bank_or_seq, the side will get swapped
    // later in that function. Thus, we signal that we want to load into the slot
    // of the bank that we no longer need.)
    if (gBankLoadedPool.temporary.entries[0].id == seqPlayer->defaultBank[0]) {
        gBankLoadedPool.temporary.nextSide = 1;
    } else if (gBankLoadedPool.temporary.entries[1].id == seqPlayer->defaultBank[0]) {
        gBankLoadedPool.temporary.nextSide = 0;
    }
}

/**
 * Add an item to the end of a list, if it's not already in any list.
 */
void audio_list_push_back(struct AudioListItem *list, struct AudioListItem *item) {
    if (item->prev != NULL) {
        eu_stubbed_printf_0("Error:Same List Add\n");
    } else {
        list->prev->next = item;
        item->prev = list->prev;
        item->next = list;
        list->prev = item;
        list->u.count++;
        item->pool = list->pool;
    }
}

/**
 * Remove the last item from a list, and return it (or NULL if empty).
 */
void *audio_list_pop_back(struct AudioListItem *list) {
    struct AudioListItem *item = list->prev;
    if (item == list) {
        return NULL;
    }
    item->prev->next = list;
    list->prev = item->prev;
    item->prev = NULL;
    list->u.count--;
    return item->u.value;
}

void init_layer_freelist(void) {
    s32 i;

    gLayerFreeList.prev = &gLayerFreeList;
    gLayerFreeList.next = &gLayerFreeList;
    gLayerFreeList.u.count = 0;
    gLayerFreeList.pool = NULL;

    for (i = 0; i < ARRAY_COUNT(gSequenceLayers); i++) {
        gSequenceLayers[i].listItem.u.value = gSequenceLayers + i;
        gSequenceLayers[i].listItem.prev = NULL;
        audio_list_push_back(&gLayerFreeList, &gSequenceLayers[i].listItem);
    }
}

u8 m64_read_u8(struct M64ScriptState *state) {
    u8 *midiArg = state->pc++;
    return *midiArg;
}

s16 m64_read_s16(struct M64ScriptState *state) {
    s16 ret = *(state->pc++) << 8;
    ret = *(state->pc++) | ret;
    return ret;
}

u16 m64_read_compressed_u16(struct M64ScriptState *state) {
    u16 ret = *(state->pc++);
    if (ret & 0x80) {
        ret = (ret << 8) & 0x7f00;
        ret = *(state->pc++) | ret;
    }
    return ret;
}

// JP version with macros to simulate inlining by copt. Edit if you dare.
#include "copt/seq_channel_layer_process_script_copt.inc.c"

u8 get_instrument(struct SequenceChannel *seqChannel, u8 instId, struct Instrument **instOut,
                  struct AdsrSettings *adsr) {
    struct Instrument *inst;
    UNUSED u32 pad;

    if (instId >= gCtlEntries[seqChannel->bankId].numInstruments) {
        instId = gCtlEntries[seqChannel->bankId].numInstruments;
        if (instId == 0) {
            return 0;
        }
        instId--;
    }

    inst = gCtlEntries[seqChannel->bankId].instruments[instId];
    if (inst == NULL) {
        struct SequenceChannel seqChannelCpy = *seqChannel;

        while (instId != 0xff) {
            inst = gCtlEntries[seqChannelCpy.bankId].instruments[instId];
            if (inst != NULL) {
                break;
            }
            instId--;
        }
    }

    if (((uintptr_t) gBankLoadedPool.persistent.pool.start <= (uintptr_t) inst
         && (uintptr_t) inst <= (uintptr_t) (gBankLoadedPool.persistent.pool.start
                                             + gBankLoadedPool.persistent.pool.size))
        || ((uintptr_t) gBankLoadedPool.temporary.pool.start <= (uintptr_t) inst
            && (uintptr_t) inst <= (uintptr_t) (gBankLoadedPool.temporary.pool.start
                                                + gBankLoadedPool.temporary.pool.size))) {
        adsr->envelope = inst->envelope;
        adsr->releaseRate = inst->releaseRate;
        *instOut = inst;
        instId++;
        return instId;
    }

    gAudioErrorFlags = instId + 0x20000;
    *instOut = NULL;
    return 0;
}

void set_instrument(struct SequenceChannel *seqChannel, u8 instId) {
    if (instId >= 0x80) {
        seqChannel->instOrWave = instId;
        seqChannel->instrument = NULL;
    } else if (instId == 0x7f) {
        seqChannel->instOrWave = 0;
        seqChannel->instrument = (struct Instrument *) 1;
    } else {
        seqChannel->instOrWave =
            get_instrument(seqChannel, instId, &seqChannel->instrument, &seqChannel->adsr);
        if (seqChannel->instOrWave == 0) {
            seqChannel->hasInstrument = FALSE;
            return;
        }
    }
    seqChannel->hasInstrument = TRUE;
}

void sequence_channel_set_volume(struct SequenceChannel *seqChannel, u8 volume) {
    seqChannel->volume = FLOAT_CAST(volume) / US_FLOAT(127.0);
}

void sequence_channel_process_script(struct SequenceChannel *seqChannel) {
    struct M64ScriptState *state;
    struct SequencePlayer *seqPlayer;
    u8 cmd;
    s8 temp;
    u8 loBits;
    u16 sp5A;
    s32 sp38;
    s8 value;
    s32 i;
    u8 *seqData;

    if (!seqChannel->enabled) {
        return;
    }

    if (seqChannel->stopScript) {
        for (i = 0; i < LAYERS_MAX; i++) {
            if (seqChannel->layers[i] != NULL) {
                seq_channel_layer_process_script(seqChannel->layers[i]);
            }
        }
        return;
    }

    seqPlayer = seqChannel->seqPlayer;
    if (seqPlayer->muted && (seqChannel->muteBehavior & MUTE_BEHAVIOR_STOP_SCRIPT) != 0) {
        return;
    }

    if (seqChannel->delay != 0) {
        seqChannel->delay--;
    }

    state = &seqChannel->scriptState;
    if (seqChannel->delay == 0) {
        for (;;) {
            cmd = m64_read_u8(state);
            if (cmd == 0xff) { // chan_end
                if (state->depth == 0) {
                    sequence_channel_disable(seqChannel);
                    break;
                }
                state->depth--, state->pc = state->stack[state->depth];
            }
            if (cmd == 0xfe) { // chan_delay1
                break;
            }
            if (cmd == 0xfd) { // chan_delay
                seqChannel->delay = m64_read_compressed_u16(state);
                break;
            }
            if (cmd == 0xf3) { // chan_hang
                seqChannel->stopScript = TRUE;
                break;
            }
            if (cmd > 0xc0) {
                switch (cmd) {
                    case 0xff: // chan_end
                        break;
                    case 0xfc: // chan_call
                        if (0 && state->depth >= 4) {
                            eu_stubbed_printf_0("Audio:Track :Call Macro Level Over Error!\n");
                        }
                        sp5A = m64_read_s16(state);
                        state->depth++, state->stack[state->depth - 1] = state->pc;
                        state->pc = seqPlayer->seqData + sp5A;
                        break;

                    case 0xf8: // chan_loop; loop start, N iterations (or 256 if N = 0)
                        if (0 && state->depth >= 4) {
                            eu_stubbed_printf_0("Audio:Track :Loops Macro Level Over Error!\n");
                        }
                        state->remLoopIters[state->depth] = m64_read_u8(state);
                        state->depth++, state->stack[state->depth - 1] = state->pc;
                        break;

                    case 0xf7: // chan_loopend
                        state->remLoopIters[state->depth - 1]--;
                        if (state->remLoopIters[state->depth - 1] != 0) {
                            state->pc = state->stack[state->depth - 1];
                        } else {
                            state->depth--;
                        }
                        break;

                    case 0xf6: // chan_break; break loop, if combined with jump
                        state->depth--;
                        break;

                    case 0xfb: // chan_jump
                    case 0xfa: // chan_beqz
                    case 0xf9: // chan_bltz
                    case 0xf5: // chan_bgez
                        sp5A = m64_read_s16(state);
                        if (cmd == 0xfa && value != 0) {
                            break;
                        }
                        if (cmd == 0xf9 && value >= 0) {
                            break;
                        }
                        if (cmd == 0xf5 && value < 0) {
                            break;
                        }
                        state->pc = seqPlayer->seqData + sp5A;
                        break;
                    case 0xf2: // chan_reservenotes
                        note_pool_clear(&seqChannel->notePool);
                        note_pool_fill(&seqChannel->notePool, m64_read_u8(state));
                        break;
                    case 0xf1: // chan_unreservenotes
                        note_pool_clear(&seqChannel->notePool);
                        break;

                    case 0xc2: // chan_setdyntable
                        sp5A = m64_read_s16(state);
                        seqChannel->dynTable = (void *) (seqPlayer->seqData + sp5A);
                        break;

                    case 0xc5: // chan_dynsetdyntable
                        if (value != -1) {
                            sp5A = (u16) ((((*seqChannel->dynTable)[value])[0] << 8)
                                          + (((*seqChannel->dynTable)[value])[1]));
                            seqChannel->dynTable = (void *) (seqPlayer->seqData + sp5A);
                        }
                        break;

                    case 0xc1: // chan_setinstr ("set program"?)
                        set_instrument(seqChannel, m64_read_u8(state));
                        break;

                    case 0xc3: // chan_largenotesoff
                        seqChannel->largeNotes = FALSE;
                        break;

                    case 0xc4: // chan_largenoteson
                        seqChannel->largeNotes = TRUE;
                        break;

                    case 0xdf: // chan_setvol
                        sequence_channel_set_volume(seqChannel, m64_read_u8(state));
                        break;

                    case 0xe0: // chan_setvolscale
                        seqChannel->volumeScale = FLOAT_CAST(m64_read_u8(state)) / US_FLOAT(128.0);
                        break;

                    case 0xde: // chan_freqscale; pitch bend using raw frequency multiplier N/2^15 (N is
                               // u16)
                        sp5A = m64_read_s16(state);
                        seqChannel->freqScale = FLOAT_CAST(sp5A) / US_FLOAT(32768.0);
                        break;

                    case 0xd3: // chan_pitchbend; pitch bend by <= 1 octave in either direction
                               // (-127..127) (m64_read_u8(state) is really s8 here)
                        cmd = m64_read_u8(state) + 127;
                        seqChannel->freqScale = gPitchBendFrequencyScale[cmd];
                        break;

                    case 0xdd: // chan_setpan
                        seqChannel->pan = FLOAT_CAST(m64_read_u8(state)) / US_FLOAT(128.0);
                        break;

                    case 0xdc: // chan_setpanmix; set proportion of pan to come from channel (0..128)
                        seqChannel->panChannelWeight = FLOAT_CAST(m64_read_u8(state)) / US_FLOAT(128.0);
                        break;

                    case 0xdb: // chan_transpose; set transposition in semitones
                        temp = *state->pc++;
                        seqChannel->transposition = temp;
                        break;

                    case 0xda: // chan_setenvelope
                        sp5A = m64_read_s16(state);
                        seqChannel->adsr.envelope = (struct AdsrEnvelope *) (seqPlayer->seqData + sp5A);
                        break;

                    case 0xd9: // chan_setdecayrelease
                        seqChannel->adsr.releaseRate = m64_read_u8(state);
                        break;

                    case 0xd8: // chan_setvibratoextent
                        seqChannel->vibratoExtentTarget = m64_read_u8(state) * 8;
                        seqChannel->vibratoExtentStart = 0;
                        seqChannel->vibratoExtentChangeDelay = 0;
                        break;

                    case 0xd7: // chan_setvibratorate
                        seqChannel->vibratoRateStart = seqChannel->vibratoRateTarget =
                            m64_read_u8(state) * 32;
                        seqChannel->vibratoRateChangeDelay = 0;
                        break;

                    case 0xe2: // chan_setvibratoextentlinear
                        seqChannel->vibratoExtentStart = m64_read_u8(state) * 8;
                        seqChannel->vibratoExtentTarget = m64_read_u8(state) * 8;
                        seqChannel->vibratoExtentChangeDelay = m64_read_u8(state) * 16;
                        break;

                    case 0xe1: // chan_setvibratoratelinear
                        seqChannel->vibratoRateStart = m64_read_u8(state) * 32;
                        seqChannel->vibratoRateTarget = m64_read_u8(state) * 32;
                        seqChannel->vibratoRateChangeDelay = m64_read_u8(state) * 16;
                        break;

                    case 0xe3: // chan_setvibratodelay
                        seqChannel->vibratoDelay = m64_read_u8(state) * 16;
                        break;

                    case 0xd6: // chan_setupdatesperframe_unimplemented
                        cmd = m64_read_u8(state);
                        if (cmd == 0) {
                            cmd = gAudioUpdatesPerFrame;
                        }
                        seqChannel->updatesPerFrameUnused = cmd;
                        break;

                    case 0xd4: // chan_setreverb
                        seqChannel->reverbVol = m64_read_u8(state);
                        break;

                    case 0xc6: // chan_setbank; switch bank within set
                        cmd = m64_read_u8(state);
                        // Switch to the temp's (0-indexed) bank in this sequence's
                        // bank set. Note that in the binary format (not in the JSON!)
                        // the banks are listed backwards, so we counts from the back.
                        // (gAlBankSets[offset] is number of banks)
                        sp5A = ((u16 *) gAlBankSets)[seqPlayer->seqId];
                        loBits = *(sp5A + gAlBankSets);
                        cmd = gAlBankSets[sp5A + loBits - cmd];
                        if (get_bank_or_seq(&gBankLoadedPool, 2, cmd) != NULL) {
                            seqChannel->bankId = cmd;
                        } else {
                            eu_stubbed_printf_1("SUB:ERR:BANK %d NOT CACHED.\n", cmd);
                        }
                        break;

                    case 0xc7: // chan_writeseq; write to sequence data (!)
                    {
                        u8 *seqData;
                        cmd = m64_read_u8(state);
                        sp5A = m64_read_s16(state);
                        seqData = seqPlayer->seqData + sp5A;
                        *seqData = (u8) value + cmd;
                    } break;

                    case 0xc8: // chan_subtract
                    case 0xc9: // chan_bitand
                    case 0xcc: // chan_setval
                        temp = m64_read_u8(state);
                        if (cmd == 0xc8) {
                            value -= temp;
                        } else if (cmd == 0xcc) {
                            value = temp;
                        } else {
                            value &= temp;
                        }
                        break;

                    case 0xca: // chan_setmutebhv
                        seqChannel->muteBehavior = m64_read_u8(state);
                        break;

                    case 0xcb: // chan_readseq
                        sp38 = (u16) m64_read_s16(state) + value;
                        value = seqPlayer->seqData[sp38];
                        break;

                    case 0xd0: // chan_stereoheadseteffects
                        seqChannel->stereoHeadsetEffects = m64_read_u8(state);
                        break;

                    case 0xd1: // chan_setnoteallocationpolicy
                        seqChannel->noteAllocPolicy = m64_read_u8(state);
                        break;

                    case 0xd2: // chan_setsustain
                        seqChannel->adsr.sustain = m64_read_u8(state) << 8;
                        break;
                    case 0xe4: // chan_dyncall
                        if (value != -1) {
                            seqData = (*seqChannel->dynTable)[value];
                            state->depth++, state->stack[state->depth - 1] = state->pc;
                            sp5A = ((seqData[0] << 8) + seqData[1]);
                            state->pc = seqPlayer->seqData + sp5A;
                        }
                        break;
                }
            } else {
                loBits = cmd & 0xf;

                switch (cmd & 0xf0) {
                    case 0x00: // chan_testlayerfinished
                        if (seqChannel->layers[loBits] != NULL) {
                            value = seqChannel->layers[loBits]->finished;
                        }
                        break;

                    // sh: 0x70
                    case 0x70: // chan_iowriteval; write data back to audio lib
                        seqChannel->soundScriptIO[loBits] = value;
                        break;

                    case 0x80: // chan_ioreadval; read data from audio lib
                        value = seqChannel->soundScriptIO[loBits];
                        if (loBits < 4) {
                            seqChannel->soundScriptIO[loBits] = -1;
                        }
                        break;

                    // sh: 0x50
                    case 0x50: // chan_ioreadvalsub; subtract with read data from audio lib
                        value -= seqChannel->soundScriptIO[loBits];
                        break;

                    case 0x90: // chan_setlayer
                        sp5A = m64_read_s16(state);
                        if (seq_channel_set_layer(seqChannel, loBits) == 0) {
                            seqChannel->layers[loBits]->scriptState.pc = seqPlayer->seqData + sp5A;
                        }
                        break;

                    case 0xa0: // chan_freelayer
                        seq_channel_layer_free(seqChannel, loBits);
                        break;

                    case 0xb0: // chan_dynsetlayer
                        if (value != -1 && seq_channel_set_layer(seqChannel, loBits) != -1) {
                            seqData = (*seqChannel->dynTable)[value];
                            sp5A = ((seqData[0] << 8) + seqData[1]);
                            seqChannel->layers[loBits]->scriptState.pc = seqPlayer->seqData + sp5A;
                        }
                        break;

                    case 0x60: // chan_setnotepriority (arg must be >= 2)
                        seqChannel->notePriority = loBits;
                        break;

                    case 0x10: // chan_startchannel
                        sp5A = m64_read_s16(state);
                        sequence_channel_enable(seqPlayer, loBits, seqPlayer->seqData + sp5A);
                        break;

                    case 0x20: // chan_disablechannel
                        sequence_channel_disable(seqPlayer->channels[loBits]);
                        break;

                    case 0x30: // chan_iowriteval2; write data back to audio lib for another channel
                        cmd = m64_read_u8(state);
                        seqPlayer->channels[loBits]->soundScriptIO[cmd] = value;
                        break;

                    case 0x40: // chan_ioreadval2; read data from audio lib from another channel
                        cmd = m64_read_u8(state);
                        value = seqPlayer->channels[loBits]->soundScriptIO[cmd];
                        break;
                }
            }
        }
    }

    for (i = 0; i < LAYERS_MAX; i++) {
        if (seqChannel->layers[i] != 0) {
            seq_channel_layer_process_script(seqChannel->layers[i]);
        }
    }
}

void sequence_player_process_sequence(struct SequencePlayer *seqPlayer) {
    u8 cmd;
    u8 loBits;
    u8 temp;
    s32 value;
    s32 i;
    u16 u16v;
    u8 *seqData;
    struct M64ScriptState *state;

    if (seqPlayer->enabled == FALSE) {
        return;
    }

    if (seqPlayer->bankDmaInProgress == TRUE) {
        if (seqPlayer->bankDmaMesg == NULL) {
            return;
        }
        if (seqPlayer->bankDmaRemaining == 0) {
            seqPlayer->bankDmaInProgress = FALSE;
            patch_audio_bank(seqPlayer->loadingBank, gAlTbl->seqArray[seqPlayer->loadingBankId].offset,
                             seqPlayer->loadingBankNumInstruments, seqPlayer->loadingBankNumDrums);
            gCtlEntries[seqPlayer->loadingBankId].numInstruments = seqPlayer->loadingBankNumInstruments;
            gCtlEntries[seqPlayer->loadingBankId].numDrums = seqPlayer->loadingBankNumDrums;
            gCtlEntries[seqPlayer->loadingBankId].instruments = seqPlayer->loadingBank->instruments;
            gCtlEntries[seqPlayer->loadingBankId].drums = seqPlayer->loadingBank->drums;
            gBankLoadStatus[seqPlayer->loadingBankId] = SOUND_LOAD_STATUS_COMPLETE;
        } else {
            osCreateMesgQueue(&seqPlayer->bankDmaMesgQueue, &seqPlayer->bankDmaMesg, 1);
            seqPlayer->bankDmaMesg = NULL;
            audio_dma_partial_copy_async(&seqPlayer->bankDmaCurrDevAddr, &seqPlayer->bankDmaCurrMemAddr,
                                         &seqPlayer->bankDmaRemaining, &seqPlayer->bankDmaMesgQueue,
                                         &seqPlayer->bankDmaIoMesg);
        }
        return;
    }

    if (seqPlayer->seqDmaInProgress == TRUE) {
        if (seqPlayer->seqDmaMesg == NULL) {
            return;
        }
        seqPlayer->seqDmaInProgress = FALSE;
        gSeqLoadStatus[seqPlayer->seqId] = SOUND_LOAD_STATUS_COMPLETE;
    }

    // If discarded, bail out.
    if (IS_SEQ_LOAD_COMPLETE(seqPlayer->seqId) == FALSE
        || (IS_BANK_LOAD_COMPLETE(seqPlayer->defaultBank[0]) == FALSE)) {
        eu_stubbed_printf_1("Disappear Sequence or Bank %d\n", seqPlayer->seqId);
        sequence_player_disable(seqPlayer);
        return;
    }

    // Remove possible SOUND_LOAD_STATUS_DISCARDABLE marks.
    gSeqLoadStatus[seqPlayer->seqId] = SOUND_LOAD_STATUS_COMPLETE;

    gBankLoadStatus[seqPlayer->defaultBank[0]] = SOUND_LOAD_STATUS_COMPLETE;

    if (seqPlayer->muted && (seqPlayer->muteBehavior & MUTE_BEHAVIOR_STOP_SCRIPT) != 0) {
        return;
    }

    // Check if we surpass the number of ticks needed for a tatum, else stop.
    seqPlayer->tempoAcc += seqPlayer->tempo;
    if (seqPlayer->tempoAcc < gTempoInternalToExternal) {
        return;
    }
    seqPlayer->tempoAcc -= (u16) gTempoInternalToExternal;

    state = &seqPlayer->scriptState;
    if (seqPlayer->delay > 1) {
#ifndef AVOID_UB
        if (temp) {
        }
#endif
        seqPlayer->delay--;
    } else {
        for (;;) {
            cmd = m64_read_u8(state);
            if (cmd == 0xff) { // seq_end
                if (state->depth == 0) {
                    sequence_player_disable(seqPlayer);
                    break;
                }
                state->depth--, state->pc = state->stack[state->depth];
            }

            if (cmd == 0xfd) { // seq_delay
                seqPlayer->delay = m64_read_compressed_u16(state);
                break;
            }

            if (cmd == 0xfe) { // seq_delay1
                seqPlayer->delay = 1;
                break;
            }

            if (cmd >= 0xc0) {
                switch (cmd) {
                    case 0xff: // seq_end
                        break;

                    case 0xfc: // seq_call
                        u16v = m64_read_s16(state);
                        if (0 && state->depth >= 4) {
                            eu_stubbed_printf_0("Macro Level Over Error!\n");
                        }
                        state->depth++, state->stack[state->depth - 1] = state->pc;
                        state->pc = seqPlayer->seqData + u16v;
                        break;

                    case 0xf8: // seq_loop; loop start, N iterations (or 256 if N = 0)
                        if (0 && state->depth >= 4) {
                            eu_stubbed_printf_0("Macro Level Over Error!\n");
                        }
                        state->remLoopIters[state->depth] = m64_read_u8(state);
                        state->depth++, state->stack[state->depth - 1] = state->pc;
                        break;

                    case 0xf7: // seq_loopend
                        state->remLoopIters[state->depth - 1]--;
                        if (state->remLoopIters[state->depth - 1] != 0) {
                            state->pc = state->stack[state->depth - 1];
                        } else {
                            state->depth--;
                        }
                        break;

                    case 0xfb: // seq_jump
                    case 0xfa: // seq_beqz; jump if == 0
                    case 0xf9: // seq_bltz; jump if < 0
                    case 0xf5: // seq_bgez; jump if >= 0
                        u16v = m64_read_s16(state);
                        if (cmd == 0xfa && value != 0) {
                            break;
                        }
                        if (cmd == 0xf9 && value >= 0) {
                            break;
                        }
                        if (cmd == 0xf5 && value < 0) {
                            break;
                        }
                        state->pc = seqPlayer->seqData + u16v;
                        break;

                    case 0xf2: // seq_reservenotes
                        note_pool_clear(&seqPlayer->notePool);
                        note_pool_fill(&seqPlayer->notePool, m64_read_u8(state));
                        break;

                    case 0xf1: // seq_unreservenotes
                        note_pool_clear(&seqPlayer->notePool);
                        break;

                    case 0xdf: // seq_transpose; set transposition in semitones
                        seqPlayer->transposition = 0;
                        // fallthrough

                    case 0xde: // seq_transposerel; add transposition
                        seqPlayer->transposition += (s8) m64_read_u8(state);
                        break;

                    case 0xdd: // seq_settempo (bpm)
                    case 0xdc: // seq_addtempo (bpm)
                        temp = m64_read_u8(state);
                        if (cmd == 0xdd) {
                            seqPlayer->tempo = temp * TEMPO_SCALE;
                        } else {
                            seqPlayer->tempo += (s8) temp * TEMPO_SCALE;
                        }

                        if (seqPlayer->tempo > gTempoInternalToExternal) {
                            seqPlayer->tempo = gTempoInternalToExternal;
                        }

                        // if (cmd) {}

                        if ((s16) seqPlayer->tempo <= 0) {
                            seqPlayer->tempo = 1;
                        }
                        break;

                    case 0xdb: // seq_setvol
                        cmd = m64_read_u8(state);
                        switch (seqPlayer->state) {
                            case SEQUENCE_PLAYER_STATE_2:
                                if (seqPlayer->fadeRemainingFrames != 0) {
                                    f32 targetVolume = FLOAT_CAST(cmd) / US_FLOAT(127.0);
                                    seqPlayer->fadeVelocity =
                                        (targetVolume - seqPlayer->fadeVolume)
                                        / FLOAT_CAST(seqPlayer->fadeRemainingFrames);
                                    break;
                                }
                                // fallthrough
                            case SEQUENCE_PLAYER_STATE_0:
                                seqPlayer->fadeVolume = FLOAT_CAST(cmd) / US_FLOAT(127.0);
                                break;
                            case SEQUENCE_PLAYER_STATE_FADE_OUT:
                            case SEQUENCE_PLAYER_STATE_4:
                                seqPlayer->volume = FLOAT_CAST(cmd) / US_FLOAT(127.0);
                                break;
                        }
                        break;

                    case 0xda: // seq_changevol
                        temp = m64_read_u8(state);
                        seqPlayer->fadeVolume =
                            seqPlayer->fadeVolume + (f32) (s8) temp / US_FLOAT(127.0);
                        break;

                    case 0xd7: // seq_initchannels
                        u16v = m64_read_s16(state);
                        sequence_player_init_channels(seqPlayer, u16v);
                        break;

                    case 0xd6: // seq_disablechannels
                        u16v = m64_read_s16(state);
                        sequence_player_disable_channels(seqPlayer, u16v);
                        break;

                    case 0xd5: // seq_setmutescale
                        temp = m64_read_u8(state);
                        seqPlayer->muteVolumeScale = (f32) (s8) temp / US_FLOAT(127.0);
                        break;

                    case 0xd4: // seq_mute
                        seqPlayer->muted = TRUE;
                        break;

                    case 0xd3: // seq_setmutebhv
                        seqPlayer->muteBehavior = m64_read_u8(state);
                        break;

                    case 0xd2: // seq_setshortnotevelocitytable
                    case 0xd1: // seq_setshortnotedurationtable
                        u16v = m64_read_s16(state);
                        seqData = seqPlayer->seqData + u16v;
                        if (cmd == 0xd2) {
                            seqPlayer->shortNoteVelocityTable = seqData;
                        } else {
                            seqPlayer->shortNoteDurationTable = seqData;
                        }
                        break;

                    case 0xd0: // seq_setnoteallocationpolicy
                        seqPlayer->noteAllocPolicy = m64_read_u8(state);
                        break;

                    case 0xcc: // seq_setval
                        value = m64_read_u8(state);
                        break;

                    case 0xc9: // seq_bitand
                        value = m64_read_u8(state) & value;
                        break;

                    case 0xc8: // seq_subtract
                        value = value - m64_read_u8(state);
                        break;

                    default:
                        eu_stubbed_printf_1("Group:Undefine upper C0h command (%x)\n", cmd);
                        break;
                }
            } else {
                loBits = cmd & 0xf;
                switch (cmd & 0xf0) {
                    case 0x00: // seq_testchdisabled
                        if (IS_SEQUENCE_CHANNEL_VALID(seqPlayer->channels[loBits]) == TRUE) {
                            value = seqPlayer->channels[loBits]->finished;
                        }
                        break;
                    case 0x10:
                        break;
                    case 0x20:
                        break;
                    case 0x40:
                        break;
                    case 0x50: // seq_subvariation
                        value -= seqPlayer->seqVariation;
                        break;
                    case 0x60:
                        break;
                    case 0x70: // seq_setvariation
                        seqPlayer->seqVariation = value;
                        break;
                    case 0x80: // seq_getvariation
                        value = seqPlayer->seqVariation;
                        break;
                    case 0x90: // seq_startchannel
                        u16v = m64_read_s16(state);
                        sequence_channel_enable(seqPlayer, loBits, seqPlayer->seqData + u16v);
                        break;
                    case 0xa0:
                        break;
                    case 0xd8: // (this makes no sense)
                        break;
                    case 0xd9:
                        break;

                    default:
                        eu_stubbed_printf_0("Group:Undefined Command\n");
                        break;
                }
            }
        }
    }

    for (i = 0; i < CHANNELS_MAX; i++) {
        if (seqPlayer->channels[i] != &gSequenceChannelNone) {
            sequence_channel_process_script(seqPlayer->channels[i]);
        }
    }
}

// This runs 240 times per second.
void process_sequences(UNUSED s32 iterationsRemaining) {
    s32 i;
    for (i = 0; i < SEQUENCE_PLAYERS; i++) {
        if (gSequencePlayers[i].enabled == TRUE) {
            sequence_player_process_sequence(gSequencePlayers + i);
            sequence_player_process_sound(gSequencePlayers + i);
        }
    }
    reclaim_notes();
    process_notes();
}

void init_sequence_player(u32 player) {
    struct SequencePlayer *seqPlayer = &gSequencePlayers[player];
    seqPlayer->muted = FALSE;
    seqPlayer->delay = 0;
    seqPlayer->state = SEQUENCE_PLAYER_STATE_0;
    seqPlayer->fadeRemainingFrames = 0;
    seqPlayer->tempoAcc = 0;
    seqPlayer->tempo = 120 * TEMPO_SCALE; // 120 BPM
    seqPlayer->transposition = 0;
    seqPlayer->muteBehavior =
        MUTE_BEHAVIOR_STOP_SCRIPT | MUTE_BEHAVIOR_STOP_NOTES | MUTE_BEHAVIOR_SOFTEN;
    seqPlayer->noteAllocPolicy = 0;
    seqPlayer->shortNoteVelocityTable = gDefaultShortNoteVelocityTable;
    seqPlayer->shortNoteDurationTable = gDefaultShortNoteDurationTable;
    seqPlayer->fadeVolume = 1.0f;
    seqPlayer->fadeVelocity = 0.0f;
    seqPlayer->volume = 0.0f;
    seqPlayer->muteVolumeScale = 0.5f;
}

void init_sequence_players(void) {
    // Initialization function, called from audio_init
    s32 i, j;

    for (i = 0; i < ARRAY_COUNT(gSequenceChannels); i++) {
        gSequenceChannels[i].seqPlayer = NULL;
        gSequenceChannels[i].enabled = FALSE;
    }

    for (i = 0; i < ARRAY_COUNT(gSequenceChannels); i++) {
        // @bug Size of wrong array. Zeroes out second half of gSequenceChannels[0],
        // all of gSequenceChannels[1..31], and part of gSequenceLayers[0].
        // However, this is only called at startup, so it's harmless.
#ifdef AVOID_UB
#define LAYERS_SIZE LAYERS_MAX
#else
#define LAYERS_SIZE ARRAY_COUNT(gSequenceLayers)
#endif
        for (j = 0; j < LAYERS_SIZE; j++) {
            gSequenceChannels[i].layers[j] = NULL;
        }
    }

    init_layer_freelist();

    for (i = 0; i < ARRAY_COUNT(gSequenceLayers); i++) {
        gSequenceLayers[i].seqChannel = NULL;
        gSequenceLayers[i].enabled = FALSE;
    }

    for (i = 0; i < SEQUENCE_PLAYERS; i++) {
        for (j = 0; j < CHANNELS_MAX; j++) {
            gSequencePlayers[i].channels[j] = &gSequenceChannelNone;
        }

        gSequencePlayers[i].seqVariation = -1;
        gSequencePlayers[i].bankDmaInProgress = FALSE;
        gSequencePlayers[i].seqDmaInProgress = FALSE;
        init_note_lists(&gSequencePlayers[i].notePool);
        init_sequence_player(i);
    }
}
