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removed Resize() events from digest.Video hashes

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This commit is contained in:
steve 2020-01-07 11:42:09 +00:00
parent 7aa976fbf4
commit 299db2277e
1 changed files with 16 additions and 15 deletions
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31
digest/video.go
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@ -51,8 +51,13 @@ func NewVideo(tv television.Television) (*Video, error) {
// register ourselves as a television.Renderer
dig.AddPixelRenderer(dig)
// set attributes that depend on the television specification
dig.Resize(-1, -1)
// length of pixels array contains enough room for the previous frames
// digest value
l := len(dig.digest)
// alloscate enough pixels for entire frame
l += ((television.HorizClksScanline + 1) * (dig.GetSpec().ScanlinesTotal + 1) * pixelDepth)
dig.pixels = make([]byte, l)
return dig, nil
}
@ -69,21 +74,17 @@ func (dig *Video) ResetDigest() {
}
}
// ResizeSpec implements television.PixelRenderer interface
func (dig *Video) ResizeSpec() error {
return dig.Resize(0, 0)
}
// Resize implements television.PixelRenderer interface
//
// Note that Resize() does nothing in this implementation because we always
// work on the entire frame.
//
// that said, we could record resize events by having a flag bit in the pixel
// array. this additional bit (or byte) will then be included in the hashing
// process.
//
// !!TODO: consider resize flag bit for digest.Video
func (dig *Video) Resize(_, _ int) error {
// length of pixels array contains enough room for the previous frames
// digest value
l := len(dig.digest)
// alloscate enough pixels for entire frame
l += ((television.HorizClksScanline + 1) * (dig.GetSpec().ScanlinesTotal + 1) * pixelDepth)
dig.pixels = make([]byte, l)
return nil
}