mirror of
https://github.com/make-42/xyosc
synced 2025-01-19 11:07:35 +01:00
57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
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// Copyright 2019 Marius Ackerman
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package godsp
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import (
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"bytes"
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"io/ioutil"
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"github.com/mjibson/go-dsp/wav"
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)
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/*
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ReadWavFile returns the demultiplexed channels of a wav file, and the sample rate in Hz.
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*/
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func ReadWavFile(wavName string) (channels [][]float64, sampleRate, bitsPerSample int) {
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buf, err := ioutil.ReadFile(wavName)
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if err != nil {
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panic(err)
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}
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rdr, err := wav.New(bytes.NewBuffer(buf))
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if err != nil {
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panic(err)
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}
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numSamples, numChannels := rdr.Samples, int(rdr.NumChannels)
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sampleRate = int(rdr.SampleRate)
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bitsPerSample = int(rdr.Header.BitsPerSample)
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channels = make([][]float64, numChannels)
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chanLen := numSamples / numChannels
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for i := range channels {
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channels[i] = make([]float64, chanLen)
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}
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samples, err := rdr.ReadFloats(rdr.Samples)
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if err != nil {
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panic(err)
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}
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for i, j := 0, 0; i < len(samples); {
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for _, ch := range channels {
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ch[j] = float64(samples[i])
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i++
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}
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j++
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}
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return
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}
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