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fq/dev/snippets.jq
Mattias Wadman e3ae1440c9 interp: Rename to/from<format> functions to to_/from_<format>
Feels less cluttered, easier to read and more consistent.

Still keep tovalue, tobytes etc that are more basic functions this
only renamed format related functions.
Also there is an exceptin for to/fromjson as it comes from jq.

Also fixes lots of spelling errors while reading thru.
2022-12-21 17:48:39 +01:00

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def protobuf_to_value:
.fields | map({(.name | tostring): (.enum // .value)}) | add;
# converted from https://github.com/FFmpeg/FFmpeg/blob/870bfe16a12bf09dca3a4ae27ef6f81a2de80c40/libavutil/display.c av_display_rotation_get
def mp4_matrix_structure_rotation:
( .a as $s0
| .c as $s3
| .b as $s1
| .d as $s4
| ($s0*$s0 + $s3*$s3 | sqrt) as $scale0
| ($s1*$s1 + $s4*$s4 | sqrt) as $scale1
| atan2($s1/$scale1; $s0 / $scale0) * 180 / 3.14159265359
| -round
);
def flac_dump:
[ "fLaC"
, first(.. | select(format == "flac_metadatablocks"))
, (.. | select(format == "flac_frame"))
] | tobits;
def urldecode:
gsub(
"%(?<c>[a-fA-F0-9]{2})";
( .c
| ascii_downcase
| explode
# "0"-"9" or "a"-"f"
| map(.-48 | if .>=49 then .-39 else . end)
| [.[0]*16+.[1]]
| implode
)
);
# see all first frames where sample_rate changes
# ex: .frames | changes(.header.sample_rate)
def changes(f): streaks_by(f)[].[0];
def to_radix62sp: to_radix(62; "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
def from_radix62sp: from_radix(62; {
"0": 0, "1": 1, "2": 2, "3": 3,"4": 4, "5": 5, "6": 6, "7": 7, "8": 8, "9": 9,
"a": 10, "b": 11, "c": 12, "d": 13, "e": 14, "f": 15, "g": 16,
"h": 17, "i": 18, "j": 19, "k": 20, "l": 21, "m": 22, "n": 23,
"o": 24, "p": 25, "q": 26, "r": 27, "s": 28, "t": 29, "u": 30,
"v": 31, "w": 32, "x": 33, "y": 34, "z": 35,
"A": 36, "B": 37, "C": 38, "D": 39, "E": 40, "F": 41, "G": 42,
"H": 43, "I": 44, "J": 45, "K": 46, "L": 47, "M": 48, "N": 49,
"O": 50, "P": 51, "Q": 52, "R": 53, "S": 54, "T": 55, "U": 56,
"V": 57, "W": 58, "X": 59, "Y": 60, "Z": 61
});
# "01:09:55.76" -> 4195.76
# 4195.76 -> "01:09:55.76"
def duration:
def lpad($s; $w): ($s * ($w+1-length))[1:] + .;
def _string:
( split(":")
| map(tonumber)
| reverse
| [foreach .[] as $n (0; . + 1; pow(60; .-1) * $n)]
# sum smallest to largest seem to improve precision
| sort
| reverse
| add
);
def _number:
if . == 0 then 0
else
[ ( [ (recurse(if . > 0 then intdiv(.; 60) else empty end) | . % 60)]
| reverse
| .[1:]
| map(tostring | lpad("0"; 2))
| join(":")
)
# ugly but float is not accurate enough
, ( tostring
| split(".")[1] // empty
| ".", .
)
] | join("")
end;
if type == "string" then _string
elif type == "number" then _number
else error("expected string or number") end;