dev: Move examples and snippets to wiki

dev/editlist.jq

@@ -1,55 +0,0 @@
-#!/usr/bin/env fq -d mp4 -f
-
-# TODO: esds, make fancy printer? shared?
-# TODO: handle -1 media_time
-# TODO: fragmented mp4
-
-# root
-#   moov
-#     mvhd (movie header)
-#     trak (track)
-#       mdia
-#         mdhd (media header)
-#         hdlr (handler?)
-#         minf
-#           stbl
-#             stsd (sample description)
-#       elst (edit list)
-
-( first(.boxes[] | select(.type == "moov")?)
-| first(.boxes[] | select(.type == "mvhd")?) as $mvhd
-| {
-    duration: $mvhd.duration,
-    time_scale: $mvhd.time_scale,
-    duration_s: ($mvhd.duration / $mvhd.time_scale),
-    tracks:
-      [ .boxes[]
-      | select(.type == "trak")
-      | first(.. | select(.type == "mdhd")?) as $mdhd
-      | first(.. | select(.type == "hdlr")?) as $hdlr
-      | first(.. | select(.type == "stsd")?) as $stsd
-      | first(.. | select(.type == "elst")?) as $elst
-      | first(.. | select(.type == "stts")?) as $stts
-      | ([$stts.entries[] | .count * .delta] | add) as $stts_sum
-      | {
-          component_type: $hdlr.component_subtype,
-          # the sample descriptors are handled as boxes by the mp4 decoder
-          data_format: $stsd.boxes[0].type,
-          media_scale: $mdhd.time_scale,
-          edit_list:
-            [ $elst.entries[]
-            | {
-                track_duration: .segment_duration,
-                media_time: .media_time,
-                track_duration_s: (.segment_duration / $mvhd.time_scale),
-                media_time_s: (.media_time / $mdhd.time_scale)
-              }
-            ],
-          stts: {
-            sum: $stts_sum,
-            sum_s: ($stts_sum / $mdhd.time_scale)
-          }
-        }
-      ]
-  }
-)

dev/snippets.jq

@@ -1,84 +0,0 @@
-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;