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codec/mjpeg/jpeg.go: defining consts for SOS header fields

This commit is contained in:
Saxon 2020-01-02 11:20:21 +10:30
parent 49138ce021
commit 323cc185dc
1 changed files with 11 additions and 3 deletions
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14
codec/mjpeg/jpeg.go
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@ -71,13 +71,19 @@ const (
jfifHeadLen = 16 // Length of JFIF header segment excluding APP0 marker. jfifHeadLen = 16 // Length of JFIF header segment excluding APP0 marker.
) )
// SOF0 (start of scan) header fields. // SOF0 (start of frame) header fields.
const ( const (
sofLen = 17 sofLen = 17
sofPrecision = 8 sofPrecision = 8
sofNoOfComponents = 3 sofNoOfComponents = 3
) )
// SOS (start of scan) header fields.
const (
sosLen = 12
sosComponentsInScan = 3
)
var ( var (
errNoQTable = errors.New("no quantization table") errNoQTable = errors.New("no quantization table")
errReservedQ = errors.New("q value is reserved") errReservedQ = errors.New("q value is reserved")
@ -360,8 +366,10 @@ func writeHeader(p *putBuffer, _type, width, height, nbqTab, dri int, qtable []b
// Write start of scan. // Write start of scan.
mark(p, codeSOS) mark(p, codeSOS)
p.put16(12) p.put16(sosLen)
p.put8(3) p.put8(sosComponentsInScan)
// TODO: find out what remaining fields are.
p.put8(1) p.put8(1)
p.put8(0) p.put8(0)
p.put8(2) p.put8(2)