163 lines
3.5 KiB
Go
163 lines
3.5 KiB
Go
// Copyright 2022 The Oto 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 oto
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import (
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"errors"
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"fmt"
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"time"
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"github.com/ebitengine/oto/v3/internal/mux"
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)
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var errDeviceNotFound = errors.New("oto: device not found")
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type context struct {
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sampleRate int
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channelCount int
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mux *mux.Mux
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wasapiContext *wasapiContext
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winmmContext *winmmContext
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nullContext *nullContext
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ready chan struct{}
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err atomicError
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}
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func newContext(sampleRate int, channelCount int, format mux.Format, bufferSizeInBytes int) (*context, chan struct{}, error) {
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ctx := &context{
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sampleRate: sampleRate,
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channelCount: channelCount,
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mux: mux.New(sampleRate, channelCount, format),
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ready: make(chan struct{}),
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}
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// Initializing drivers might take some time. Do this asynchronously.
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go func() {
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defer close(ctx.ready)
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xc, err0 := newWASAPIContext(sampleRate, channelCount, ctx.mux, bufferSizeInBytes)
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if err0 == nil {
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ctx.wasapiContext = xc
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return
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}
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wc, err1 := newWinMMContext(sampleRate, channelCount, ctx.mux, bufferSizeInBytes)
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if err1 == nil {
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ctx.winmmContext = wc
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return
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}
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if errors.Is(err0, errDeviceNotFound) && errors.Is(err1, errDeviceNotFound) {
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ctx.nullContext = newNullContext(sampleRate, channelCount, ctx.mux)
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return
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}
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ctx.err.TryStore(fmt.Errorf("oto: initialization failed: WASAPI: %v, WinMM: %v", err0, err1))
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}()
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return ctx, ctx.ready, nil
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}
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func (c *context) Suspend() error {
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<-c.ready
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if c.wasapiContext != nil {
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return c.wasapiContext.Suspend()
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}
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if c.winmmContext != nil {
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return c.winmmContext.Suspend()
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}
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if c.nullContext != nil {
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return c.nullContext.Suspend()
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}
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return nil
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}
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func (c *context) Resume() error {
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<-c.ready
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if c.wasapiContext != nil {
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return c.wasapiContext.Resume()
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}
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if c.winmmContext != nil {
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return c.winmmContext.Resume()
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}
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if c.nullContext != nil {
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return c.nullContext.Resume()
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}
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return nil
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}
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func (c *context) Err() error {
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if err := c.err.Load(); err != nil {
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return err
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}
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select {
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case <-c.ready:
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default:
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return nil
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}
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if c.wasapiContext != nil {
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return c.wasapiContext.Err()
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}
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if c.winmmContext != nil {
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return c.winmmContext.Err()
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}
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if c.nullContext != nil {
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return c.nullContext.Err()
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}
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return nil
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}
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type nullContext struct {
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suspended bool
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}
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func newNullContext(sampleRate int, channelCount int, mux *mux.Mux) *nullContext {
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c := &nullContext{}
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go c.loop(sampleRate, channelCount, mux)
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return c
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}
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func (c *nullContext) loop(sampleRate int, channelCount int, mux *mux.Mux) {
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var buf32 [4096]float32
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sleep := time.Duration(float64(time.Second) * float64(len(buf32)) / float64(channelCount) / float64(sampleRate))
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for {
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if c.suspended {
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time.Sleep(time.Second)
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continue
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}
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mux.ReadFloat32s(buf32[:])
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time.Sleep(sleep)
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}
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}
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func (c *nullContext) Suspend() error {
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c.suspended = true
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return nil
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}
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func (c *nullContext) Resume() error {
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c.suspended = false
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return nil
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}
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func (*nullContext) Err() error {
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return nil
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}
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