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frame: Implement decoding samples with wasted bits-per-sample.

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This commit is contained in:
mewmew 2016-01-20 19:36:23 +01:00
parent 8a188c6be0
commit bd85ea13e2
1 changed files with 13 additions and 2 deletions
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15
frame/subframe.go
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@ -49,6 +49,13 @@ func (frame *Frame) parseSubframe(bps uint) (subframe *Subframe, err error) {
case PredFIR:
err = subframe.decodeFIR(frame.br, bps)
}
// Left shift to accout for wasted bits-per-sample.
for i, sample := range subframe.Samples {
// TODO: Verify after a FLAC file with wasted bits-per-sample has been found.
subframe.Samples[i] = sample << subframe.WastedBits
}
return subframe, err
}
@ -61,6 +68,8 @@ type SubHeader struct {
Pred Pred
// Prediction order used by fixed and FIR linear prediction decoding.
Order int
// Wasted bits-per-sample.
WastedBits uint
}
// parseHeader reads and parses the header of a subframe.
@ -130,11 +139,13 @@ func (subframe *Subframe) parseHeader(br *bits.Reader) error {
}
if x != 0 {
// The number of wasted bits-per-sample is unary coded.
_, err = br.ReadUnary()
x, err = br.ReadUnary()
if err != nil {
return unexpected(err)
}
return fmt.Errorf("frame.Subframe.parseHeader: not yet implemented. Never seen a FLAC file contain wasted-bits-per-sample before. I want to dissect one of those files. Please send it to me :)")
subframe.WastedBits = uint(x)
log.Printf("frame.Subframe.parseHeader: Never seen a FLAC file contain wasted-bits-per-sample before. I want to dissect one of those files. Please send it to me :)")
return nil
}
return nil