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#841: import packed 10/12-bit and Y'CbCr DPX stills

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Problem: DPX import rejected the 10/12-bit packed layout (packing 0)
and the Y'CbCr descriptors (100 CbYCrY, 101 CbYACrYA, 102 CbYCr,
103 CbYCrA) with an "unsupported" error.

Fix: unpack packed components back to back, low bits first, each scan
line on a 32-bit boundary (as ffmpeg reads 12-bit packed files), and
convert Y'CbCr to RGB with the matrix the colorimetric field names
(BT.709; BT.601 for the 601 and composite codes; by picture size when
unspecified), in video range unless the reference codes span the full
code range; 4:2:2 chroma is shared by each pixel pair. Unit tests for
every new layout and hostile headers; an ffmpeg oracle test builds
packed 12-bit RGB and 8-bit 4:2:2 / 4:4:4 / 4:4:4:4 files from
ffmpeg's test picture and matches its decode within one 8-bit step.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
vangel76
2026-10-11 01:26:31 +02:00
co-authored by Claude Opus 5.5
parent c47e883c27
commit 42b990b72b
4 changed files with 280 additions and 36 deletions
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docs/file-format-parity.md
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@@ -56,7 +56,7 @@ only). "Tested" names the evidence.
| WebP | — | yes | no | ahead |
| **PSD** (layers as sequence) | read (layered) | no | — | 0% |
| **OpenEXR** | read + write | no | sequences (half float, linear RGB / premultiplied RGBA, uncompressed; #806) | 35% |
| **DPX** | read + write | yes: luma / RGB / RGBA, 8–16-bit, filled 10/12-bit, either byte order (#821); no packed 10/12-bit, RLE or Y'CbCr | sequences (10-bit RGB, BT.709; #779) | 80% |
| **DPX** | read + write | yes: luma / RGB / RGBA, 8–16-bit, filled 10/12-bit, either byte order (#821); packed 10/12-bit, Y'CbCr 4:2:2 / 4:4:4 with or without alpha (#841); no RLE | sequences (10-bit RGB, BT.709; #779) | 90% |
| Targa | read + write | yes: every image type, RLE, colour maps, 15–32-bit (#821) | sequences (24-bit, 32-bit with alpha; #779) | 95% |
| HEIF / HEIC | read | no | — | 0% |
| Radiance HDR, AI / EPS, ICO, PTL | read | no | — | 0% |