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snippet: Add mp4_matrix_structure_rotation

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Mattias Wadman 2021-11-19 15:59:41 +01:00
parent 278e909a2f
commit 44251ca8bd
1 changed files with 12 additions and 0 deletions
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dev/snippets.jq
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@ -6,6 +6,18 @@ def protobuf_to_value:
def mp4_box:
[0, 0, 0, 16, "ftyp", "isom", 0, 0 , 2 , 0, .] | mp4.boxes;
# 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"))