Following on from our last struggle to build nice features that was more about reactivity and refactoring.

Let us build:

Noisescape Visual

I look around for the tech. This has nice high-level features but is super slow:

Clementine does something that shows episodes of different sonic qualities quite well:

Which someone has made available on its own here

Which I hosted via a python server, then merged that with the other python server using flask Blueprint.

Involving lots of temporary files, and this string of pixels from moodbar:

    # Create image from pixel values
    width = len(pixel_values) // 3
    height = 1
    image = Image.frombytes('RGB', (width, height), pixel_values)

Then the frontendistry:

        <soundbox ...>
                {#if cuelet.moodbar}
                    <moodbar class="liner"
                        style="background-image:{`url(${cuelet.moodbar})`}"
                        />
                    <moodbar class="liner mask"/>
                {/if}

With styles:

        soundbox {
            ...
            position: relative;
        }
        ...
        .liner {
            width:100%;
            height:100%;
            position:absolute;
            display:block;
        }
        moodbar {
            background-size: contain;
            filter: blur(3.14159px);
        }
        moodbar.mask {
            background: url(vertical_mid_fade.webp);
            mix-blend-mode:soft-light;
        }

Here is vertical_mid_fade.webp, which helps it look more mineral:

Comes out like this:

Loooovely. More of this definitely.

The user may need all these glowy features disabled if it bogs them down...

Anyway!

Refactoring goes awry

I split from Cueleter a Cuelet, but the move from:

class SyncableCueleter {

...

    sync_cuelets(playlets) {

...

                cuelet = {in:playlet.in,out:playlet.out}

                cuelet = new Cuelet({
                    orch:this,
                    in:playlet.in,out:playlet.out
                })

Has left those <soundbox> (representation of each cuelet) saying "!buffer" and without moodbar, as if it no longer knows about properties on cuelet now that it isn't simply a hash.

A day later, I hear that:

You can also use $state in class fields (whether public or private):

class Todo {
	done = $state(false);
	text = $state();
        ...

So perhaps Cuelet needs to $state() for its buffer|moodbar properties:

class Cuelet {
    public orch:Cueleter
    public in
    public out

    buffer = $state()
    moodbar = $state()
    constructor(opt) {

As as is usual in Svelte, the compiler does half of the education:

We must rename cuelet.ts to cuelet.svelte.ts, to be verbose about where Svelte can apply itself.

And yes. We are back where we were again.

npm update

Between svelte-5.0.0-next.85 and -next.131 they added live code updates! No more full page reload + wasm downloads while tweaking the UI:

Seems more flickery? Would make a nice transition - warm analogue glitch sputtery ray bendings.

This goes away when I resolve:

It says SYNC CUELETS a whole lot, unless we:

    async get_moodbar() {
        if (untrack(() => this.moodbar)) return

...and the same for this.buffer

Faster Selection edge sampling

Faster Knob

In KnobTime.svelte:

    let {
        value=$bindable(5),
        // 20ms at a time
        step=0.02,

        ...props
    } = $props()

Zone's selections and files

We now create a Fili to load an input file.

They "happen" in a <File {fil}...

When ready, they spawns an associated Sele, which continue what sel used to do:

{#each selections as sel (sel.id)}
<Selection {sel} ... />
{/each}

Where we initialise it into...

    let in_time:tracktime = $state(sel.in != null ? sel.in : 30)
    let out_time:tracktime = $state(sel.out != null ? sel.out : 36)

So they can be changed by knobs, which reactively leads into:

    $effect(() => {
        // inclusively select dublet spaces
        let fel = {
            in: Math.floor(in_time / chunk_length) * chunk_length,
            out: Math.ceil(out_time / chunk_length) * chunk_length,
        }
        if (fel.in != sel.in || fel.out != sel.out) {
            // non-reactively set it here
            sel.set(fel)
            console.log("Selection Woke",sel)
            // then cause a reaction
            // < only needed when adjusting sel.out, wtf?
            on_reselection()
        }

This could probably be two lines, but see needed when adjusting sel.out

I will hopefully find time to minimise a bunch of this confusion, I'll just pass it along for now.

eg Sele's in and out don't need to be $state, but playlets does:
export class Sele {

public id
public fil:Fili

public in
public out
public playlets:adublet[] = $state([])
public modes

Anyway, when compiling this selection to playlets back up in Zone:

    // generate a bunch of tiles for your ears to walk on
    function make_playlets(sel:Sele):adublet[] {
        // how to encode (modes)
        sel.modes = clone_modes()
        // and attaches the Fili's identity
        if (!sel.fil.dig) debugger
        set_modes_value(sel.modes,'input',sel.fil.name+"#"+sel.fil.dig)

We identify the fil in sel.modes as if it was another option to ffmpeg.

We shall move to something like this soon, when we think about syncing files to the worker and making that worker further away (via http)

sel then branches into nublets:

            sel_to_modes(nublet,nublet.modes)
            // this now describes a unique dublet
            nublet.modes_json = JSON.stringify(nublet.modes)

So we can find things in the cache:

        let ideal = dublets.find(
            dublet => dublet.modes_json == nublet.modes_json
        )

There is a vague level of matching too:

            let vague = dublets.find(
                dublet => dublet.in == nublet.in && dublet.out == nublet.out
                    && dublet.sel.fil == nublet.sel.fil
            )

Which would have it play whatever it has for that file+time, eg if you change the desired bitrate

This seems a little extraneous. Could we just play the input file? Read on...

jammed in the Cuelet

I drop a file in and the cuelets fail to render the new audio!

If I widen the loop to get it to render a never-before-cached cuelet time, the new audio is used:

After headscratching, I put in this delete when syncing a new objectURL:

class Cuelet {
...

sync_cuelet(playlet:adublet) {
...
// find playable
let dublet = playlet.ideal_dub || playlet.vague_dub
if (!dublet) return
if (this.objectURL != dublet.objectURL) {
delete this.buffer

Since of course:

    async decodeAudio() {
        if (untrack(() => this.buffer)) return

We are now at f2e87c03bbba1: delete buffer when syncing a new objectURL

Horizontal Knob

In Knob:

    let {
        ...
        axis = "Y",
        ...
    } = $props()

And at some point:

    function get_movement(event:PointerEvent) {
        let key = "movement"+axis
        if (event[key] == null) throw "no such axis: "+axis
        let movement = event[key]
        // towards the top of the screen decreases Y
        if (axis == "Y") movement *= -1
        return movement
    }

Then in KnobTime

<Knob 
...    axis="X"

    bind:grabbed={grabbed}
    ...
/>

{#if grabbed}
    <aro>⇔</aro>
{/if}

Also if you look at Selection,

the knobs are snippeted to Schaud for positioning on the ends of the cuelets

and then positioned a little more to mark their exact values on the cuelets timeline!

        <Schaud {needle_uplink} {sel} {on_reselection}>
            {#snippet leftend(cueletsin:tracktime, width_per_s)}
                ...
                <span>
                    <grit class="openbracket"
                        style="left:{-locator_grit(cueletsin,selin,width_per_s)}px">
                        <KnobTime
                            bind:value={selin}
                            {commit} >
                            {#snippet label()}
                                in
                            {/snippet}
                        </KnobTime>
                    </grit>
                </span>
            {/snippet}

Using:

    function locator_grit(fromtime,totime,width_per_s) {
        let delta = fromtime - totime
        return delta * width_per_s
    }

This looks like this:

There is the issue of your pointer not appearing where the knob ends up.

Perhaps we should slide cuelets along and leave the in-point still, like the slip tool in video editing?

Then the...same for out-point?

Perhaps if all the ui was squishy slotty constellations of stuff, wide angle lensing on the focus...

The set of beads (cuelets) increasing in frequency as further bits are hauled in from the shoulder, your hand swooshing the sound sideways.

Speedy Knob

I get back to accommodating hi res time as in|out.

The inclusively select dublet spaces moved in here (from before)

export class Sele {
    ...
    // receives fast and fine time adjustments
    on_adjust(finely) {
        this.in = finely.in
        this.out = finely.out
        // inclusively select dublet spaces
        let fel = this.inclusivise()
        if (fel.in != this.in_inclusive || fel.out != this.out_inclusive) {
            this.in_inclusive = fel.in
            this.out_inclusive = fel.out
            console.log("Selection Woke",fel)
            // then cause a reaction
            this.enc.on_reselection()
        }
    }
    ...
    get_timespace() {
        // we have a notch
        let length = this.out_inclusive - this.in_inclusive
        if (isNaN(length)) throw "NaN"
        let chunk_length = this.enc.chunk_length
        let n_chunks = Math.ceil(length / chunk_length)
        return {length,n_chunks,chunk_length}
    }

Before, get_timespace() used this.in - which should have probably caused the joblet runner to react, but for some reason didn't?

The Cuelet 's localise_time() also needed to switch to this.in_inclusive - and thus stops many spurious calls to sync_cuelet() while we are cranking knobs, instead just when this.in_inclusive changes what playlets exist, or the playlets themselves mutate.

All this connection emerges when Selection.svelte does:

    $effect(() => {
        sel.on_adjust({in:in_time,out:out_time})
    })

They transmit to Schaud.svelte

    // respond to editing
    let ori = modus[1] = new ModusOriginale()
    $effect(() => {
        sel?.in != null && ready && ori.edge_moved({which:'in'})
    })
    $effect(() => {
        sel?.out != null && ready && ori.edge_moved({which:'out'})
    })
    

And then ModusOriginale

    edge_moved = ({which}) => {
        if (this.edge_moved_recently()) return
        ...        // this one time we play this sound
        this.zip = new Ziplet({orch:this.orch, mo:this, fil:this.fil})
        Object.assign(this.zip,{playFrom,playFor})
        this.zip.start()
        let is = this.zip

        let declack = 0.01
        // replaces the old Zip
        was && fadeout(was,declack)
        fadein(is,declack)
        // mutes the other Modus
        let others = this.orch.modus.filter(mo => mo != this)
        others.map(o => fadeout(o,declack))
        // then after a while
        let thence = playFor-declack
        setTimeout(() => {
            if (is != this.zip) return
            fadeout(is,declack)
            others.map(o => fadein(o,declack))
            setTimeout(() => {
                delete this.zip
            },declack*1000)
        },thence*1000)
    }
    // debounce eventing for in and out when sel is moved
    public last_edge_moved_ts:unixtime
    edge_moved_recently() {
        let was = this.last_edge_moved_ts
        this.last_edge_moved_ts = now()
        let delta = this.last_edge_moved_ts - was
        if (delta < 0.006) return 1
    }

Most of that's pretty ugly for lack of abstraction of pushing a new soundtrack into the moment, aesthetically.

There are details in reality, like this bit of class Ziplet is now :

    // selection trims
    get duration():number {
        if (this.playFor) {
            // this is the duration when trimming the end
            //  it already knows about any playFrom
            return this.playFor
        }
        let dur = this.whole_duration
        if (this.playFrom) {
            dur -= this.playFrom
        }
        return dur
    }

Yet this didn't need to change:

    get ends_at() {
        if (this.startTime == null) throw "!startTime"
        return this.startTime + this.duration
    }

And here's a look at precise looping:

Thanks!

Other Projects with media in the browser

https://martinwecke.de/108/

a drum machine with a nice simple interface.

https://github.com/bwasti/mebm

browser based video editor that supports animation of images and text overlays

Other Stuff

https://www.audiolabs-erlangen.de/resources/MIR/FMP/C0/C0.html

educational material for teaching and learning Fundamentals of Music Processing (FMP) with a particular focus on the audio domain. Covering well-established topics in Music Information Retrieval (MIR) as motivating application scenarios, the FMP notebooks provide detailed textbook-like explanations of central techniques and algorithms in combination with Python code examples that illustrate how to implement the theory.

Similar Music Finder - gemtracks.com

For library expansion.

"The society that separates its scholars from its warriors will have its thinking done by cowards and its fighting done by fools."

Hows Ecology Squad

Sunday, 9 June 2024

bitzliten: sound looper with Svelte 5

Noisescape Visual

Faster Knob

Other Projects with media in the browser

Other Stuff

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