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Merge pull request #754 from wader/mp4-cslg

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mp4: Decode cslg box
This commit is contained in:
Mattias Wadman 2023-08-31 15:18:37 +02:00 committed by GitHub
commit 7b3eb58dfb
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3 changed files with 32 additions and 0 deletions
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19
format/mp4/boxes.go
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@ -1722,6 +1722,25 @@ func decodeBox(ctx *decodeContext, d *decode.D, typ string) {
})
}
})
case "cslg":
version := d.FieldU8("version")
d.FieldU24("flags")
switch version {
case 0:
d.FieldS32("composition_to_dts_shift")
d.FieldS32("least_decode_to_display_delta")
d.FieldS32("greatest_decode_to_display_delta")
d.FieldS32("composition_start_time")
d.FieldS32("composition_end_time")
case 1:
d.FieldS64("composition_to_dts_shift")
d.FieldS64("least_decode_to_display_delta")
d.FieldS64("greatest_decode_to_display_delta")
d.FieldS64("composition_start_time")
d.FieldS64("composition_end_time")
default:
d.FieldRawLen("data", d.BitsLeft())
}
default:
// there are at least 4 ways to encode udta metadata in mov/mp4 files.
//

13
format/mp4/testdata/cslg.fqtest vendored Normal file
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@ -0,0 +1,13 @@
$ fq -o force=true -d mp4 dv cslg.mp4
|00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f|0123456789abcdef|.{}: cslg.mp4 (mp4) 0x0-0x1f.7 (32)
| | | boxes[0:1]: 0x0-0x1f.7 (32)
| | | [0]{}: box 0x0-0x1f.7 (32)
0x00|00 00 00 20 |... | size: 32 0x0-0x3.7 (4)
0x00| 63 73 6c 67 | cslg | type: "cslg" (Composition to decode timeline mapping) 0x4-0x7.7 (4)
0x00| 00 | . | version: 0 0x8-0x8.7 (1)
0x00| 00 00 00 | ... | flags: 0 0x9-0xb.7 (3)
0x00| 00 00 00 c8| ....| composition_to_dts_shift: 200 0xc-0xf.7 (4)
0x10|ff ff ff 38 |...8 | least_decode_to_display_delta: -200 0x10-0x13.7 (4)
0x10| 00 00 01 2c | ..., | greatest_decode_to_display_delta: 300 0x14-0x17.7 (4)
0x10| 00 00 00 00 | .... | composition_start_time: 0 0x18-0x1b.7 (4)
0x10| 00 00 7b 70| ..{p| composition_end_time: 31600 0x1c-0x1f.7 (4)

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format/mp4/testdata/cslg.mp4 vendored Normal file
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