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September 9, 2023 13:32
When capturing JPEG frames, v4l will tell us that the JPEG can be as big as the decoded YUV frame, like 4 MB for a 1080p frame. But typically the JPEG is only 500 KB or so. Exposing bytesused allows callers to copy less data and write precisely-sized JPEG frames
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Looks like this commit does the same thing? c6925e5 |
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This lets users copy JPEG frames better.
Previously, when you read JPEG frames, it tells you the length of the frame is
size_image, the maximum possible length. So it copies a bunch of zeroes and then if you write them to a file, the file is bigger than the actual JPEG contents.