mirror of
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89 lines
2.6 KiB
Plaintext
89 lines
2.6 KiB
Plaintext
def protobuf_to_value:
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.fields | map({(.name | tostring): (.enum // .value)}) | add;
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# hack to parse just a box
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# <binary> | mp4_box
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def mp4_box:
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[0, 0, 0, 16, "ftyp", "isom", 0, 0 , 2 , 0, .] | mp4.boxes;
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# converted from https://github.com/FFmpeg/FFmpeg/blob/870bfe16a12bf09dca3a4ae27ef6f81a2de80c40/libavutil/display.c av_display_rotation_get
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def mp4_matrix_structure_rotation:
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( .a as $s0
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| .c as $s3
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| .b as $s1
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| .d as $s4
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| ($s0*$s0 + $s3*$s3 | sqrt) as $scale0
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| ($s1*$s1 + $s4*$s4 | sqrt) as $scale1
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| atan2($s1/$scale1; $s0 / $scale0) * 180 / 3.14159265359
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| -round
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);
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def flac_dump:
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[ "fLaC"
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, first(.. | select(format == "flac_metadatablocks"))
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, (.. | select(format == "flac_frame"))
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] | tobits;
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def urldecode:
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gsub(
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"%(?<c>[a-fA-F0-9]{2})";
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( .c
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| ascii_downcase
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| explode
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# "0"-"9" or "a"-"f"
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| map(.-48 | if .>=49 then .-39 else . end)
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| [.[0]*16+.[1]]
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| implode
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)
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);
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# see all first frames where sample_rate changes
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# ex: .frames | changes(.header.sample_rate)
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def changes(f): streaks_by(f)[].[0];
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def radix62sp: radix(62; "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; {
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"0": 0, "1": 1, "2": 2, "3": 3,"4": 4, "5": 5, "6": 6, "7": 7, "8": 8, "9": 9,
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"a": 10, "b": 11, "c": 12, "d": 13, "e": 14, "f": 15, "g": 16,
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"h": 17, "i": 18, "j": 19, "k": 20, "l": 21, "m": 22, "n": 23,
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"o": 24, "p": 25, "q": 26, "r": 27, "s": 28, "t": 29, "u": 30,
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"v": 31, "w": 32, "x": 33, "y": 34, "z": 35,
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"A": 36, "B": 37, "C": 38, "D": 39, "E": 40, "F": 41, "G": 42,
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"H": 43, "I": 44, "J": 45, "K": 46, "L": 47, "M": 48, "N": 49,
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"O": 50, "P": 51, "Q": 52, "R": 53, "S": 54, "T": 55, "U": 56,
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"V": 57, "W": 58, "X": 59, "Y": 60, "Z": 61
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});
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# "01:09:55.76" -> 4195.76
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# 4195.76 -> "01:09:55.76"
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def duration:
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def lpad($s; $w): ($s * ($w+1-length))[1:] + .;
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def _string:
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( split(":")
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| map(tonumber)
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| reverse
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| [foreach .[] as $n (0; . + 1; pow(60; .-1) * $n)]
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# sum smallest to largest seem to improve precision
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| sort
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| reverse
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| add
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);
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def _number:
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if . == 0 then 0
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else
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[ ( [ (recurse(if . > 0 then intdiv(.; 60) else empty end) | . % 60)]
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| reverse
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| .[1:]
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| map(tostring | lpad("0"; 2))
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| join(":")
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)
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# ugly but float is not accurate enough
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, ( tostring
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| split(".")[1] // empty
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| ".", .
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)
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] | join("")
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end;
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if . | type == "string" then _string
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elif . | type == "number" then _number
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else error("expected string or number") end;
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