mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 21:32:20 +02:00
66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
// Copyright 2018 The Ebiten Authors
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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 stb
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import (
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"fmt"
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"github.com/gopherjs/gopherwasm/js"
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)
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var flatten = js.Global().Get("window").Call("eval", `(function(arr) {
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var ch = arr.length;
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var len = arr[0].length;
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var result = new Float32Array(ch * len);
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for (var j = 0; j < len; j++) {
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for (var i = 0; i < ch; i++) {
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result[j*ch+i] = arr[i][j];
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}
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}
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return result;
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})`)
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func init() {
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// Eval wasm.js first to set the Wasm binary to Module.
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js.Global().Get("window").Call("eval", string(stbvorbis_js))
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}
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func DecodeVorbis(buf []byte) ([]float32, int, int, error) {
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var r js.Value
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ch := make(chan struct{})
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arr := js.TypedArrayOf(buf)
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var f js.Callback
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f = js.NewCallback(func(args []js.Value) {
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r = args[0]
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close(ch)
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f.Release()
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})
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js.Global().Get("stbvorbis").Call("decode", arr).Call("then", f)
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arr.Release()
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<-ch
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if r == js.Null() {
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return nil, 0, 0, fmt.Errorf("audio/vorbis/internal/stb: decode failed")
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}
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channels := r.Get("data").Length()
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flattened := flatten.Invoke(r.Get("data"))
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data := make([]float32, flattened.Length())
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arr = js.TypedArrayOf(data)
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arr.Call("set", flattened)
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arr.Release()
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return data, channels, r.Get("sampleRate").Int(), nil
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}
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