mirror of
https://github.com/make-42/hayai.git
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94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
// Copyright 2020 Hajime Hoshi
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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 oto
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import (
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"fmt"
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"sync"
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"syscall/js"
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)
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type go2CppDriver struct {
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writer js.Value
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buf js.Value
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cond *sync.Cond
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bufferSize int
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written int
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}
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func newDriverGo2Cpp(sampleRate, channelNum, bitDepthInBytes, bufferSize int) (tryWriteCloser, error) {
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writer := js.Global().Get("go2cpp").Call("createAudio", sampleRate, channelNum, bitDepthInBytes, bufferSize)
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d := &go2CppDriver{
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writer: writer,
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buf: js.Global().Get("Uint8Array").New(16),
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cond: sync.NewCond(&sync.Mutex{}),
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bufferSize: bufferSize,
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}
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d.writer.Set("onBufferConsumed", js.FuncOf(func(this js.Value, args []js.Value) interface{} {
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d.cond.L.Lock()
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defer d.cond.L.Unlock()
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wasFull := d.written >= d.bufferSize
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n := args[0].Int()
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d.written -= n
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if d.written < 0 {
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panic("oto: buffer is consumed too quickly")
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}
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if wasFull && n > 0 {
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d.cond.Signal()
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}
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return nil
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}))
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return d, nil
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}
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func (d *go2CppDriver) TryWrite(data []byte) (int, error) {
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l := d.buf.Get("byteLength").Int()
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if l < len(data) {
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for l < len(data) {
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l *= 2
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}
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d.buf = js.Global().Get("Uint8Array").New(l)
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}
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js.CopyBytesToJS(d.buf, data)
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d.cond.L.Lock()
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defer d.cond.L.Unlock()
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for d.written >= d.bufferSize {
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d.cond.Wait()
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}
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result := d.writer.Call("sendDataToBuffer", d.buf, len(data))
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if result.Type() != js.TypeNumber {
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return 0, fmt.Errorf("oto: write failed: %s", result.String())
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}
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n := result.Int()
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d.written += n
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return n, nil
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}
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func (d *go2CppDriver) Close() error {
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d.writer.Call("close")
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return nil
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}
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func (d *go2CppDriver) tryWriteCanReturnWithoutWaiting() bool {
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return false
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}
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