1use sva_core::DEFAULT_STORE_BYTES;
4use sva_engine::{
5 DEFAULT_BUFFER_SECS, DEFAULT_CELL_SECS, DEFAULT_FLOOR_DB, DEFAULT_FRAME_SECS,
6 DEFAULT_LEDGER_DEPTH, DEFAULT_MAX_PAIRS, DEFAULT_MAX_PEAKS, DEFAULT_MODULATION_WINDOW_SECS,
7 DEFAULT_NOVELTY_WINDOW_SECS, DEFAULT_OVERSAMPLE, DEFAULT_PERIODICITY_WINDOW_SECS,
8 DEFAULT_SAMPLE_RATE, DEFAULT_SMOOTH_SECS, PSYCHOACOUSTIC_V1, READINGS, Reads,
9 self_similarity::MAX_CELLS,
10};
11
12pub fn help_text() -> String {
15 let bits = PSYCHOACOUSTIC_V1.precision_bits;
16 let store_gb = DEFAULT_STORE_BYTES >> 30;
17 let representations = representations();
18 format!(
19 r#"USAGE:
20 sva-cli (render | analyze | lint | trace | builtins | outline | new) [arguments]
21
22DESCRIPTION:
23 A composition is a directory of node files, each one closed-form expression in
24 `t` or `f` on one line, or a score placing notes in time. sva-cli reads that
25 composition and prints what it is and what it sounds like, as JSON on stdout.
26 `render`, `lint` and `trace` read the current directory; `new` writes beside it
27 and `analyze` reads a file.
28
29SCORES:
30 A score is a `.jsonl` file: JSON Lines, one object per line, sorted by `at`;
31 `@score/drop` reads `score/drop.jsonl`, and a ref never writes `.jsonl`. A
32 file with no extension opening with `{{` refuses with the rename. Line 1 is
33 its annotation, the doc comment's four fields, which `lint` holds it to:
34 {{"annotation": "Models: ... | Neglects: ... | IO: (t) -> amplitude | Tags: ..."}}
35 Every other line is one kind, told by its keys, and may add `"comment"`:
36 event "at", "node", "deg", "len" and the node's parameters: plays it
37 mark "at", "mark": a point `mark(name)` reads in this file's times
38 comment "at", "comment": a note to the reader at a time
39 move "at", "lane", "to", and "node", "len", "shape" where written
40 A score lowers to equations, the sum of its events in written order, each
41 its node shifted to its `at`; marks, comments and moves sound nothing.
42 at a time string, "0.25b" or "0.5s", or arithmetic over times, "2b +
43 1b/3" for a triplet; a bare number has no unit and refuses. A file
44 counts every time in bars or every one in seconds. "mark(verse) -
45 2b" is a position, "mark(drop) - mark(build)" a duration.
46 node an `@ref` from the score's own directory: a sound, an equation or
47 another score. On a line placing a score `len` crops it there and
48 nothing else binds; a `node` list mixing scores and sounds refuses
49 `len`.
50 deg a whole scale degree counted from 1, the tonic: sugar for "f0":
51 "deg(n)". In a seven-row scale 8 is the tonic an octave up, 0 the
52 seventh below and -6 the tonic an octave down. A chromatic note
53 binds "f0": "deg(7)*1st"; a line writing both refuses.
54 len a time as `at` takes, bound as the node's `len`.
55 other binds the node's parameter of that name: a number, or a constant in
56 a string, "0.03s", "-6db", "900hz", "A1", "0.8*0.9", "deg(5)/2".
57 Any field but `comment` may be a list. A line listing N items is N events,
58 moves or marks, item i of every list going to the i-th and a single value to
59 all; lists of different lengths refuse. A chord is a `deg` list on one `at`:
60 {{"at": "0b", "node": "@../instruments/keys", "deg": [1, 3, 5],
61 "vel": [0.8, 0.5, 0.6]}}
62 `deg(n)` is the tonic in `variables/key` times degree n's ratio in the scale
63 `variables/scale` names, read where the line sits, in a score or in any
64 equation. A scale is one the language names, as `minor` or `dorian` (`sva-cli
65 builtins` lists each with its cents), or a file of one row per degree in cents
66 above the tonic, ascending, the last the period, named by a ref: a file
67 `scales/custom` holding 200 400 500 700 900 1100 1200 is the major scale. A
68 value reading `t` or a `@ref`, a field the node does not read, a parameter it
69 reads that nothing binds, and a `deg` with no scale refuse before any audio,
70 each naming the score's file, line and column.
71
72 A lane is one value moving through the song: a node's parameter, a move
73 naming "node" and "lane": "cutoff", or a variable under `variables/`, a move
74 naming "lane" alone: "energy", "key", "scale", "bpm" (never "meter"). A move
75 with no `len` sets the lane at `at`; with "len" and "shape", `lin` or `exp`,
76 it ramps there from the value it holds:
77 {{"at": "24b", "node": "@../instruments/saw", "lane": "cutoff",
78 "to": "9khz", "len": "8b", "shape": "exp"}}
79 {{"at": "72b", "lane": "key", "to": "key*2st", "comment": "a tone up"}}
80 {{"at": "92b", "lane": "bpm", "to": "bpm*8/9", "len": "4b", "shape": "lin"}}
81 A `to` naming the lane means its home value, the node's default or the
82 variable's file, so it follows `--set`. A lane reaches every instance of its
83 node, from a score or an equation, inside a wrapper too, unless the line or
84 an invoking equation passes that parameter, which wins. Where it holds one
85 value over an instance's span it binds that number; where it moves there the
86 instance reads it at its song time, and where the engine refuses a moving
87 value, such as `sat`'s `drive`, the move refuses as `bad-lane`: pass a
88 constant, move the lane between notes, or close the sound's tail with a crop.
89 A score's times ride the tempo curve the `bpm` lane draws; `b` in an equation
90 stays a bar of `variables/bpm`. A song places its sections at marks:
91 {{"at": "0b", "mark": "intro"}}
92 {{"at": "mark(intro)", "node": "@intro"}}
93 {{"at": "mark(intro) + 8b", "mark": "verse"}}
94 {{"at": "mark(verse)", "node": "@verse"}}
95 `concat` and `repeat` place parts on the curve too: `repeat(@score/riff-1b, 4)`.
96 An equation reading a score at `t - d`, an echo or a send, hears the song as
97 it was d earlier: its lines keep their song time, and a move however many
98 reads reach it is one move.
99 A control score is one no sounding score places, read by an equation as a
100 signal: `@score/song(t) * (1 - @score/pump(t))` ducks the song under it.
101 `sva-cli outline @score/song` prints a song's marks, tempo, lanes, events and
102 size. Lint and render warn of a line passing a parameter whose lane ramps
103 under it (`line-overrides-lane`), and of a lane no instance reads
104 (`lane-reaches-nothing`).
105
106RESERVED VARIABLES:
107 Four nodes under `variables/` are reserved: a ref reads one like any node,
108 and a bar or a degree reads one by name:
109 variables/bpm a number, the beats per minute: 120
110 variables/meter beats per bar over the note: 4/4
111 variables/key the tonic `deg` counts from, a note or hertz: C3
112 variables/scale the scale `deg` counts in, a built-in's name: major, or a
113 ref to a scale file: @../scales/custom
114 A `b` literal or a file's `-2b` span reads bpm and meter; a `deg(n)` reads key
115 and scale. Before anything renders, each read is replaced by its value, by one
116 pass for all four: a bar becomes `n*(beats*60/bpm)` seconds and `deg(n)`
117 becomes `@variables/key` times degree n's ratio, the tonic still a ref. A
118 read with no value to replace it refuses as `bad-tempo` or `bad-scale`, as
119 does a variable holding no such value, such as bpm without meter, or a
120 scale name no built-in has, which refuses listing every built-in. A stream's
121 edit to a variable, or to the scale file it names, replaces every read of it
122 again. A node elsewhere named `bpm` is an ordinary node. Any other file under
123 `variables/`, as `variables/energy` holding 0.5, is a variable of the
124 composition's own: a ref reads it, `--set` sets it, and a score's moves move
125 it, as they move the reserved ones but `meter` (SCORES).
126
127RENDER:
128 sva-cli render '<expression>' --representation <list> [--until '<condition>']
129 [--bits <n>] [--rate <hz>] [--threads <n>] [--cache <path|none>]
130 [--set <name>=<text>]... [--confirm]
131
132 Renders one expression, in the grammar a node file's body uses, and prints one
133 reading per representation under `data.representations`. `@path` reads a node
134 from the current directory and `@/abs/path` one anywhere; there is no default
135 target. Every reading states its `source` (exact or measured), the
136 conformance profile it ran under, and its rate.
137
138 The target's own ref may read an interval: `@piano4([0, 2b], f0=C4,
139 vel=0.5, release=1s)`, where `release` is the instrument's own parameter. Its ends are the language's literals (`s`, `ms`, `b`,
140 `sp`, or a bare `0`); `[a, inf)` and `[a,)` leave the end open; the other
141 arguments are the node's own named ones. The start trims the output alone:
142 history before it is still computed, so a loop or a filter carries the state
143 it had there. With no interval the render starts at 0, earlier only where a
144 crop reaches before it, and its end is open. Inside an expression a window is
145 a `crop`. A target that samples its one ref read, `sample(@piano4([0, 2b],
146 f0=C4))`, reads that ref's interval and binds and the same node values.
147
148 Every node is computed over its support met with what reads it, and nowhere
149 else: outside its support a node is exactly zero. A closed interval renders
150 exactly its length, nothing cut. An open one ends where the root's support
151 does: a crop's end, the exact underflow of an `exp`, a clamp holding a factor
152 at zero; or earlier, where a proven upper bound on the root's magnitude stays
153 under the profile's silence threshold (-120 dBFS) from a sample on. A root
154 with no such bound (a held sine, a loop) is never cut. The label's `pruned`
155 states the threshold as `db` and the root's cut, `from` the sample the render
156 is treated as silent from. A stream's term leaves `@notes` where its support
157 ends. An open interval over a root whose support never ends and is never cut
158 (a held sine, a physical solver) refuses as `render.no_end`. A short-time
159 transform reads its input whole, and refuses one with no end as
160 `engine.unbounded_extent`. A form in `f` with no dual in `t` has no samples
161 and refuses as its dual does, `cast.left_algebra`.
162
163 A render is a stream pulled to its end: a closed form, a short-time
164 transform and what either reads are computed over their whole extent first,
165 and every other node block by block. `--until '<condition>'` stops the render
166 at the first sample the condition holds at, or at the interval's end,
167 whichever is first. It is checked as each block is pulled, so no node driven
168 block by block runs past the block it holds in. A condition compares (`<`,
169 `<=`, `>`, `>=`) `t`, `envelope(t)` (the RMS over every channel of the
170 `envelope` representation's frame holding `t`, framed by its own `frame`
171 where one is asked) and literals, joined by `and`/`or`.
172
173 `--representation <list>` takes a comma list of readings and may repeat. Each
174 is a call in the language's own syntax, its options its named arguments:
175 `spectrum(peaks=8, frame=50ms)`, `ledger(depth=3, brief=1)`. A `frame`,
176 `window`, `cell` or `smooth` is a time as a score writes one, in seconds,
177 `50ms`, or in bars, `1b/8` (`1/8b` is one over eight bars), a bar lasting
178 what the render's tempo says; where none is known, as in `analyze`, bars
179 refuse as `tempo.invalid_bpm_meter`. An entry
180 followed by `=<path>` writes a file instead, listed under `written`:
181 `samples=<path>.wav` writes audio, encoded as `--bits` says; any other path
182 takes the reading's JSON, uncapped. A path that already holds a file refuses
183 unless `--confirm` is written. `samples=alsa:<device>` plays the samples on
184 that ALSA device (`alsa:default`, `alsa:hw:1`, `alsa:plughw:1,0`) as each
185 block is pulled, in real time, through `aplay` from alsa-utils; Linux only,
186 anywhere else it refuses as `destination.unsupported_platform`. It sends
187 32-bit floats, or integer PCM where `--bits` is 16 or under. A device that
188 cannot take the format refuses with aplay's reason, and one aplay says plays
189 another rate than the render's stops there as `destination.rate_inexact`.
190 `samples(buffer=<t>)` is how much the device holds ahead of what it plays.
191 Once it has played out, `data.played` states the device, its seconds, rate,
192 channels, format, the buffer asked and the one granted, and every underrun
193 aplay reported, with what it cannot see.
194 `lines`, `atoms`, `derivative`, `bindings`, `arguments`, and a closed form's
195 `spectrum`, `envelope` and `pitch`, read the expression and ignore the range.
196
197 A closed form's `spectrum` and `pitch` are its exact lines, so a term under a
198 crop or an envelope, which has a width and is no line, refuses them; so do
199 `spectrum(frame=)` and `envelope(frame=)`, as a closed form has no frames. To
200 measure any of them frame by frame, a reader samples the target's ref,
201 `sample(@x([0, 1s]))`, and an author writes `sample(...)` inside the node.
202 A closed form with no exact envelope, such as a crop of a decay, refuses
203 `envelope` with the reason rather than measuring it unasked; `sample(...)`
204 asks for the measured one. A measured `spectrum` is one spectrum: every
205 `frame`-long window across the range, averaged. `pitch` is framed, one entry
206 per `frame`; for the spectrum at one instant, read a range one frame long.
207 A measured `envelope` is framed too, and reads every channel: a frame's
208 `rms` is the root mean square of all its channels' samples together, its
209 `peak` the largest magnitude in any channel. `onsets` reads every channel
210 as well: a frame's flux is the sum of each channel's, and a strike's energy
211 that of all channels' samples together, so opposite phases cancel nothing.
212
213 `--bits <n>` is the precision every sample is written to, from 2 to 52: the
214 point where a series is truncated, and the encoding of a `.wav`, integer PCM
215 at n bits up to 16 and 32-bit float above. `--rate <hz>` (default
216 {DEFAULT_SAMPLE_RATE}) is the one rate a render samples at: the target is read
217 at its instants, and every node at the instants its reader asks for. A
218 closed form is exact at any instant, and so is a continuous loop, one
219 constant delay at a gain under 1 over a closed form such as
220 `x + 0.5*self(t - 17ms)`, which is its series. A filter, a discrete loop, a
221 solver and `rand` step at the rate asked for, where `1sp` is one step, so an
222 `sp` count or `self[idx(t) - 1]` means one sample at whatever rate is asked.
223 `rand` draws once per step, keyed by that step's index; a key between steps
224 reads the step nearest it, ties to even.
225
226 `--set <name>=<text>` renders as if the variable `variables/<name>` held
227 `<text>`, and writes no file: `--set key=G3` transposes every degree to G3,
228 `--set scale=dorian` changes mode (a scale file is a ref written from
229 `variables/`, as the file holds it: `--set scale=@../scales/custom`), `--set
230 bpm=140` moves every bar, `--set meter=3/4` regroups them and `--set
231 energy=0.8` sets a variable of the composition's own. It sets a lane's home
232 value: a move whose `to` names it follows. It may repeat, once per variable: a
233 variable set twice refuses as `render.set_twice`, a name with no file under
234 `variables/` that is no reserved one as `render.set_unreserved`, listing the
235 variables there, and the file's path, `variables/key=G3`, as
236 `render.set_path`, naming the short form.
237
238 `--threads <n>` (default: every core the machine reports) is the most
239 threads a render computes on; `1` computes every value in turn on one.
240 Values none of the others reads, and the blocks of a value that holds no
241 state, compute apart, to the same bits on any number of threads.
242
243 A discrete loop reads its own past only by index; `self(t - d)` in one
244 refuses as `type.discrete_self_at_time`, naming what made it discrete. A
245 read `@x(k*t - d)` steps `x` at `k` times the step, every input it reads,
246 `sp` and `idx` with it, and rounds `d` to the nearest sample of that step,
247 ties to even: shifts are rounded to the nearest sample so placements share
248 one cached value; timing is exact to half a sample, and the label's
249 `moved_s` states the most any read moved. A node is computed once
250 per step however many reads ask for it. A node that holds state read at a
251 time that moves refuses as `type.stateful_warp`, naming what
252 holds its state; `@x[idx(...)]` reads its nearest step instead, as `p[idx(...)]`
253 does a signal passed in as parameter `p`, and any `idx`, as
254 `idx(t - 5ms - 2ms*sin(2*pi*t))`, is read sample by sample. An edit to a
255 stream plays from the next sample on.
256
257 A render keeps in a store on disk its target and, under it, each node of
258 samples that holds state (a filter, a discrete loop or a solver in it) or
259 that two or more nodes read. Nothing else is kept. A closed form, `sample`
260 of one and `rand` have a value at any instant and are computed where read.
261 A node without state that one node alone reads, however many times, is
262 computed again by that reader from what the node itself reads: no other
263 reader could ask for it, and without state it restarts at any sample, where
264 a filter or a loop must run from its start. So a stage worth keeping is a
265 node of its own that ends in a filter or a loop, or one two nodes read. A
266 kept value is named by what it computes: never its file's name, directory,
267 comments, spacing, or the order its named arguments are written in, so a
268 renamed or moved copy, a constant lifted into a default, an expression split
269 into a file of its own or written back inline, and two addends swapped all
270 read one entry. The next render of anything that reads the same value reads
271 it back, bit for bit, and computes nothing under it. The store is on by
272 default, at `$XDG_CACHE_HOME/sva`, else `~/.cache/sva`; `--cache <path>`
273 moves it (a `/dev/shm` path keeps it in memory) and `--cache none` turns it
274 off. It holds at most {store_gb} GB, the least recently used values going
275 first, and a store another build of sva-cli wrote is emptied when opened. A
276 render stages what it computes beside the store as it goes, and the store
277 itself is written once, when the render ends, fails, or is stopped by SIGINT
278 or SIGTERM.
279
280 `ledger` prints one row per node under the target. A row's `share` is the
281 part of its reader's own energy that row accounts for, so one reader's refs
282 sum to 1; a ref no addend isolates, such as one factor of a product, prints
283 `null`. Each ref carrying a share is collapsed once on its own, so a ledger
284 costs one collapse per attributed ref beyond the render, and `depth` bounds
285 how many, counted in refs from one file to another. Every row is computed
286 whole over the range, however late a reader reads it. `brief=1` keeps only
287 the rows that clipped, `skim=1` drops the wider fields.
288
289 `arguments` renders nothing: for every instance under the target it prints
290 each builtin call's named arguments as the numbers the call was lowered
291 with, a solver's whole parameter set with `written: false` on each default
292 it filled in, and the operand each `min`/`max` `chosen` where a call folds
293 one to a number: in named arguments and a solver's, modal bank's or
294 `noise`'s positionals. One inside a filter's or cast's positional or
295 `rand`'s key or seed is not listed. `at` spans are bytes of the instance's
296 own body, as `sva-cli outline` counts them.
297
298REPRESENTATIONS:
299 Each one a `--representation` call, its arguments in parentheses, every
300 default under DEFAULTS. `exact` is read off the written math, `measured` off
301 samples.
302
303{representations}
304
305ANALYZE:
306 sva-cli analyze <file.wav> --representation <list> [--confirm]
307
308 Runs the same readings over a whole external `.wav` at its own rate, never
309 resampled. Only the readings a buffer answers alone apply, each listed under
310 REPRESENTATIONS as `measured` or `exact off a closed form, measured off
311 samples`; the rest need the graph behind it.
312
313LINT:
314 sva-cli lint ['<expression>'] [--format <json|text>]
315
316 Checks the current directory without rendering a sample. With no target it
317 checks every file under its own rules, and types every entry point, which
318 types every file it reaches. With a target, in render's grammar, it checks
319 the files that target reaches, and prints the interval a render of it reads.
320 Either refuses a type error as `render` does.
321
322 A score's annotation is its doc comment, under the same codes, and its lines
323 no body, so the length checks pass it by; a file of two or more lines that is
324 neither a score nor a scale refuses as `multiline-body` before any check
325 runs. Each song lint types prints its warnings beside the findings.
326
327 Every check prints one `data.diagnostics` item. `warning` exits 0, `error`
328 exits non-zero, so branch on the verdict and never on whether the array is
329 empty. No flag downgrades an error.
330
331 error missing-comment no `;` comment line
332 multiline-comment more than one
333 malformed-comment not four ` | ` fields, `Models:` `Neglects:`
334 `IO: <in> -> <out>` `Tags: <tag>[, <tag>...]`
335 long-comment-block a `;` block over 1000 characters, the line-1
336 doc comment's own run exempted
337 long-expression-body a body over 10000 characters, a backstop rather
338 than a complexity budget
339 literal-sample-rate a written rate where `sp` belongs
340 arity a builtin called without an argument it reads,
341 or with one it does not, as `rand(seed=k)`
342 warning key-is-not-a-pitch `variables/key` holds neither a note name nor
343 a number of hertz
344 parameter-has-no-default
345 a node reads a parameter no `name = value` line
346 binds, so a bare `@node` cannot play
347 support-never-ends a node's support, cut where its bound falls
348 under the silence threshold, has no end for a
349 bare render to stop at
350
351TRACE:
352 sva-cli trace <node|expression>
353
354 Prints one node's position without rendering audio: what it reads (`down`, one
355 hop), everything that reads it (`up`, transitively to an entry point), each
356 beside the expression doing the reading, the node that made it discrete, and
357 the feedback loop it sits in, if any. A score is shown as its line count, its
358 first and last `at` and the nodes it plays, never the sum it lowers to; every
359 entry point's song is lowered first, each at song time 0. An interval the
360 target reads is ignored.
361
362BUILTINS:
363 sva-cli builtins
364
365 Prints the whole callable and syntactic vocabulary: every builtin with its
366 arity and named arguments, each argument's `meaning`, `unit`, the model
367 `part` it sets and whether it `moves` with `t` (a filter's cutoff, q and gain;
368 every other named argument is one number, refused when it names none), each
369 positional's meaning where the model states one, unit suffixes, the note-name
370 grammar, the scales `variables/scale` may name with their cents, reserved
371 identifiers, special call shapes, and what has no operator at all.
372
373OUTLINE:
374 sva-cli outline <expression>
375
376 Prints the parse tree the engine builds from one expression, each node with
377 the byte `span` it was written in: calls by `name` with positional and named
378 `args`, operators by `op`, refs by `path` with their `binds`, refs and `self`
379 by how they `read`, `time` or `index`, literals by `value` and `unit`, names
380 by `name`. A node the parser supplies itself, the `0` of a prefix minus or the
381 `t` of a bare `@ref`, has `written: false`. Reads no composition. Score text,
382 JSON opening with `{{`, prints `score` instead of `outline`: one item per item
383 a line lists, with its `kind`, `line`, `span`, `at` with marks resolved, and
384 its `node`, `deg`, `args`, `mark` or `lane`, `to`, `len` and `shape`.
385
386 sva-cli outline @score/song
387
388 Run in a composition, outlines that score as the song a render of it is:
389 `marks` in bars and seconds, the `tempo` curve's pieces, each lane with its
390 home and every move resolved with its placement chain, how many instances it
391 reaches and how many see it move, and each placed event once, however many
392 reads reach it: its song time `at` (where it reads lanes, key and scale), when
393 it first `sounds` (later by the least, over the reads reaching it, of the
394 delays of the `t - d` reads of a score above it), its `len` in song time where
395 its line writes one, node, pitch in hertz and where each parameter comes from
396 (`line`, `lane` or `default`), and the `size`: placed events and the engine's
397 instances beside its limit.
398
399NEW:
400 sva-cli new <name> [--idempotency-key <key>]
401
402 Writes a starter composition at ./<name>, and refuses if that directory
403 exists. `--idempotency-key <key>` records the key beside the composition, so a
404 retry under the same key succeeds identically while the tree still holds what
405 was written. Any other key, or an edited tree, refuses.
406
407EXAMPLES:
408 sva-cli new song1 && cd song1
409 sva-cli render '@master' --representation samples=/tmp/song1.wav
410 sva-cli render '@master([0, 8b])' --representation 'ledger(depth=2),loudness'
411 sva-cli render '@voice/note([0, inf), f0=C4, len=2s)' \
412 --until 'envelope(t) < -60db and t > 1s' --representation samples=/tmp/note.wav
413 sva-cli render 'sample(@chord/home)' --representation 'spectrum(peaks=8)' --rate 48000
414 sva-cli render 'sample(@voice/note([0, 2s], f0=C4))' --representation pitch
415 sva-cli render '@master' --set key=G3 --set bpm=140 --set scale=dorian \
416 --representation samples=/tmp/song1-g.wav
417 sva-cli render '@master' \
418 --representation 'samples(buffer=100ms)=alsa:default,loudness'
419 sva-cli lint
420 sva-cli lint '@master'
421 sva-cli trace score/phrase
422 sva-cli outline @score/phrase
423 sva-cli builtins
424
425OUTPUT:
426 {{"status": "success", "data": {{"target": "@master([0, 8b])", "sample_rate":
427 {DEFAULT_SAMPLE_RATE}, "bits": {bits}, "profile": "psychoacoustic-v1",
428 "interval": {{"start_secs":
429 0, "end_secs": 16}}, "label": {{...}}, "written": {{"items": [...]}},
430 "representations": {{"ledger": {{...}}}}, "diagnostics": {{"items": []}}}},
431 "meta": {{"request_id": "req_...", "timestamp": 1700000000}}}}
432
433 `interval` is null where no reading read samples. An error adds "error":
434 {{"code", "message", "details": {{"count", "codes"}}}}. Success or error,
435 every response carries every finding in full at "data": {{"diagnostics":
436 {{"items": [{{"code", "severity", "message", "location", "help"}}],
437 "pagination": {{"count", "has_more", "next_cursor"}}}}}}, empty where it found
438 none.
439
440 Every collection carries that same {{items, pagination}} pair. `count` is the
441 whole reading's, `has_more` says `items` holds less than that, and
442 `next_cursor` is the interval start, as `0.5s`, the rest is read from. A
443 reading written to a file is written whole, uncapped. This page is an
444 envelope of its own, at "data": {{"help"}}.
445
446DEFAULTS:
447 --rate <hz> the one rate a render samples at, and `1sp`.
448 Default {DEFAULT_SAMPLE_RATE}.
449 --bits <n> the precision every sample is written to. Default {bits},
450 the `psychoacoustic-v1` profile's own.
451 ledger(depth=<n>) how deep below its target a `ledger` walks.
452 Default {DEFAULT_LEDGER_DEPTH}.
453 (peaks=<n>) peaks a `spectrum` keeps, notes a `pitch`, formants a
454 `formants`, stripes and novelty peaks a `self_similarity`
455 lists per view. Default {DEFAULT_MAX_PEAKS}.
456 alias(oversample=<n>) the multiple `alias` re-renders at to hear what folded.
457 Default {DEFAULT_OVERSAMPLE}.
458 (frame=<t>) the step a framed reading advances by, in seconds.
459 Default {DEFAULT_FRAME_SECS}, except `spectrum`, which sizes
460 its own transform to the range unless it is set.
461 (floor=<db>) the amplitude, as `-40db`, under which a harmonic reading
462 or `self_similarity` drops a partial, and under which
463 `self_similarity` counts a band level as zero.
464 Default {DEFAULT_FLOOR_DB}db.
465 voice_leading(norm=<l1|l2>) how a voice leading's moves add up. Default l1.
466 dissonance(pairs=<n>) the most partial pairs one frame sums before it refuses.
467 Default {DEFAULT_MAX_PAIRS}.
468 periodicity(window=<t>) the span of onset strength one window autocorrelates,
469 in seconds, at least twice the longest period it reads.
470 Default {DEFAULT_PERIODICITY_WINDOW_SECS}.
471 periodicity(curve=<0|1>) `1` adds every window's height at every lag.
472 Default 0.
473 modulation(window=<t>) the span of band envelope one window transforms, in
474 seconds, at least twice the slowest period it reads.
475 Default {DEFAULT_MODULATION_WINDOW_SECS}.
476 modulation(bpm=<n>) a tempo, as `140`, adding each rate's period in beats.
477 Default none.
478 self_similarity(cell=<t>) the side of one matrix cell, in seconds, a whole
479 number of frames; the target may span at most
480 {MAX_CELLS} cells. Default {DEFAULT_CELL_SECS}.
481 self_similarity(smooth=<t>) the length each diagonal is averaged over
482 before stripes are picked, in seconds.
483 Default {DEFAULT_SMOOTH_SECS}.
484 self_similarity(window=<t>) the whole width of the novelty kernel, in
485 seconds. Default {DEFAULT_NOVELTY_WINDOW_SECS}.
486 self_similarity(curve=<0|1>) `1` adds every cell's chroma and band levels and
487 each view's matrix. Default 0.
488 bindings(node=@<path>) the instance whose bindings are read; required.
489 samples(buffer=<t>) how much an `alsa:` device holds ahead of what it plays,
490 in seconds. Default {DEFAULT_BUFFER_SECS}; only a device
491 has one.
492 ledger(brief, skim) `0` unless set `1`.
493 --format <json|text> how `lint` prints its findings: the envelope, or one
494 terminal line each, colored where stdout is a terminal.
495 The same objects either way. Default json.
496 --cache <path|none> where the store lives. Default `$XDG_CACHE_HOME/sva`, else
497 `~/.cache/sva`, holding at most {store_gb} GB; `none` keeps
498 no store. A store that fails fails no render: it answers
499 as without one, warned why in `diagnostics`.
500 --set <name>=<text> a variable read as `<text>` for this render.
501 Default none: each is read off its file.
502 --confirm replaces a destination that already holds a file. Without
503 it a path already taken refuses as `conflict` and nothing
504 is written.
505
506ENVIRONMENT:
507 SVA_LOG=debug `render` logs, once it ends, what it asked of each value
508 to stderr; stdout and the samples are unchanged. Any
509 other value, or none, logs nothing. One line per second
510 of output, then one per node and a total:
511 sva-cache pass hit=0 miss=190 ... reused=0 cum-hit=0.0%
512 sva-cache t=1.022s hit=1 miss=2 ... cum-hit=0.5%
513 sva-cache node hit=1 miss=0 ... reused=3 <node>
514 sva-cache total hit=1 miss=198 ... hit-rate=0.5% ...
515 `pass` is what was looked up before the first block.
516 Each value is looked up once: a `hit` was answered by
517 the store, `prefix` found a stored run up to a switch,
518 `miss` computed it, `new` held it in memory, where the
519 store takes what it keeps from. Each read of a value
520 past its first is `reused`.
521
522EXIT CODES:
523 0 success (error.code absent)
524 1 internal_error (a destination could not be written)
525 3 validation_error (bad arguments, a composition that failed to parse, or a
526 render the engine refused)
527 4 conflict (a name `new` would overwrite, or a destination already holding a
528 file, without `--confirm`)
529 24 not_found (a `.wav` file, or a node this composition does not define)
530
531VERB ALIASES:
532 validate = lint, list = builtins, create = new, show = trace, from the `cli`
533 standard's own verb list. `render` and `analyze` take a reading, which that
534 list has no word for, so they keep their own names.
535
536SEE ALSO:
537 sva-cli --version Show version information"#
538 )
539}
540
541fn representations() -> String {
543 READINGS
544 .iter()
545 .map(|row| {
546 let keys: Vec<&str> = row.takes.iter().map(|arg| arg.key()).collect();
547 let call = match keys[..] {
548 [] => row.name.to_string(),
549 _ => format!("{}({})", row.name, keys.join(", ")),
550 };
551 let source = match row.reads {
552 Reads::ClosedForm | Reads::Structure => "exact",
553 Reads::Either => "exact off a closed form, measured off samples",
554 Reads::Samples => "measured",
555 Reads::Graph => "measured, and the graph behind the samples",
556 };
557 format!(" {call:<27}{source}\n {}", row.help)
558 })
559 .collect::<Vec<_>>()
560 .join("\n")
561}