You have a container reader and a decoder for every depth - today you connect them. One call takes WAV bytes and returns per-channel samples, choosing the right decoder from the format.
Parse a full WAV and return its de-interleaved integer samples, dispatching on bit depth.
Everything in the first two chapters converges here. ReadSamples is the reader’s
public front door: hand it the bytes of a WAV file and it returns the parsed
Format plus the audio as per-channel integer slices. Internally it does what
you have already built - validate the header, walk to the fmt and data chunks,
parse the format, decode the data, de-interleave - with one new step tying them
together.
That new step is dispatch: the bitsPerSample field decides which decoder to
run. Eight bits routes to the unsigned decoder, 16 and 24 to the signed ones. (Float
data, being non-integer, stays a separate path; keep this integer front door for
the depths that share a representation.) An unsupported depth should return a clear
error rather than a wrong guess - the same graceful-failure habit from the header.
This is the deliverable of the reading half: raw file in, exact samples out.
func ReadSamples(b []byte) (Format, [][]int, error) {// parseHeader, walk to fmt and dataf := parseFmt(fmtChunk.Payload)var flat []intswitch f.BitsPerSample { // pick the decoder by depthcase 8: flat = decode8(dataChunk.Payload)case 16: flat = decode16(dataChunk.Payload)case 24: flat = decode24(dataChunk.Payload)}return f, deinterleave(flat, f.NumChannels), nil}