mirror of
https://github.com/hajimehoshi/ebiten.git
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audio/internal/readerdriver: Implmeent a reader driver for Windows
Updates #1549
This commit is contained in:
Hajime Hoshi
parent
e43dcc2265
commit
5bd1a883d1
@ -15,6 +15,7 @@
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// +build !android
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// +build !darwin
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// +build !js
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// +build !windows
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package readerdriver
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631
audio/internal/readerdriver/driver_windows.go
Normal file
631
audio/internal/readerdriver/driver_windows.go
Normal file
@ -0,0 +1,631 @@
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// Copyright 2021 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 readerdriver
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import (
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"io"
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"runtime"
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"sync"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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const headerBufferSize = 2048
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func IsAvailable() bool {
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return true
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}
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type header struct {
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waveOut uintptr
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buffer []byte
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waveHdr *wavehdr
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}
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func newHeader(waveOut uintptr, bufferSize int) (*header, error) {
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h := &header{
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waveOut: waveOut,
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buffer: make([]byte, bufferSize),
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}
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h.waveHdr = &wavehdr{
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lpData: uintptr(unsafe.Pointer(&h.buffer[0])),
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dwBufferLength: uint32(bufferSize),
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}
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if err := waveOutPrepareHeader(waveOut, h.waveHdr); err != nil {
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return nil, err
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}
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return h, nil
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}
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func (h *header) Write(data []byte) error {
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if n := len(h.buffer) - len(data); n > 0 {
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data = append(data, make([]byte, n)...)
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}
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copy(h.buffer, data)
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return waveOutWrite(h.waveOut, h.waveHdr)
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}
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func (h *header) IsQueued() bool {
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return h.waveHdr.dwFlags&whdrInqueue != 0
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}
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func (h *header) Close() error {
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return waveOutUnprepareHeader(h.waveOut, h.waveHdr)
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}
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type context struct {
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sampleRate int
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channelNum int
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bitDepthInBytes int
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}
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func NewContext(sampleRate, channelNum, bitDepthInBytes int) (Context, chan struct{}, error) {
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ready := make(chan struct{})
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close(ready)
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c := &context{
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sampleRate: sampleRate,
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channelNum: channelNum,
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bitDepthInBytes: bitDepthInBytes,
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}
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thePlayers.setContext(c)
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return c, ready, nil
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}
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func (c *context) Suspend() error {
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return thePlayers.suspend()
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}
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func (c *context) Resume() error {
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return thePlayers.resume()
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}
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type players struct {
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context *context
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players map[*playerImpl]struct{}
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buf []byte
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waveOut uintptr
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headers []*header
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cond *sync.Cond
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}
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func (p *players) setContext(context *context) {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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p.context = context
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}
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func (p *players) add(player *playerImpl) {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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if p.players == nil {
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p.players = map[*playerImpl]struct{}{}
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}
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p.players[player] = struct{}{}
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}
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func (p *players) remove(player *playerImpl) error {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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delete(p.players, player)
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if len(p.players) > 0 {
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return nil
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}
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if p.waveOut == 0 {
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return nil
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}
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for _, h := range p.headers {
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if err := h.Close(); err != nil {
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return err
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}
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}
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p.headers = p.headers[:0]
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if err := waveOutClose(p.waveOut); err != nil {
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return err
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}
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p.waveOut = 0
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p.cond.Signal()
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return nil
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}
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func (p *players) play() error {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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if p.waveOut != 0 {
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return nil
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}
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numBlockAlign := p.context.channelNum * p.context.bitDepthInBytes
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f := &waveformatex{
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wFormatTag: waveFormatPCM,
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nChannels: uint16(p.context.channelNum),
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nSamplesPerSec: uint32(p.context.sampleRate),
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nAvgBytesPerSec: uint32(p.context.sampleRate * numBlockAlign),
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wBitsPerSample: uint16(p.context.bitDepthInBytes * 8),
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nBlockAlign: uint16(numBlockAlign),
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}
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w, err := waveOutOpen(f, waveOutOpenCallback)
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const elementNotFound = 1168
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if e, ok := err.(*winmmError); ok && e.errno == elementNotFound {
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// TODO: No device was found. Return the dummy device (hajimehoshi/oto#77).
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// TODO: Retry to open the device when possible.
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return err
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}
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if err != nil {
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return err
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}
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p.waveOut = w
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p.headers = make([]*header, 0, 4)
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for len(p.headers) < cap(p.headers) {
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h, err := newHeader(p.waveOut, headerBufferSize)
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if err != nil {
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return err
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}
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p.headers = append(p.headers, h)
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}
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p.readAndWriteBuffersImpl()
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go p.loop()
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return nil
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}
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func (p *players) shouldWait() bool {
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if p.waveOut == 0 {
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return false
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}
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if len(p.buf) < headerBufferSize*len(p.headers) {
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return false
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}
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for _, h := range p.headers {
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if !h.IsQueued() {
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return false
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}
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}
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return true
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}
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func (p *players) wait() bool {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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for p.shouldWait() {
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p.cond.Wait()
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}
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return p.waveOut != 0
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}
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func (p *players) loop() {
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for {
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if !p.wait() {
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return
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}
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p.readAndWriteBuffers()
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}
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}
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func (p *players) suspend() error {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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if p.waveOut == 0 {
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return nil
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}
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if err := waveOutPause(p.waveOut); err != nil {
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return err
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}
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return nil
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}
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func (p *players) resume() error {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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if p.waveOut == 0 {
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return nil
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}
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if err := waveOutRestart(p.waveOut); err != nil {
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return err
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}
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p.cond.Signal()
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return nil
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}
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var waveOutOpenCallback = windows.NewCallbackCDecl(func(hwo, uMsg, dwInstance, dwParam1, dwParam2 uintptr) uintptr {
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const womDone = 0x3bd
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if uMsg != womDone {
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return 0
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}
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thePlayers.cond.Signal()
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return 0
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})
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func (p *players) readAndWriteBuffers() {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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p.readAndWriteBuffersImpl()
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}
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func (p *players) readAndWriteBuffersImpl() {
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headerNum := 0
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for _, h := range p.headers {
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if h.IsQueued() {
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continue
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}
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headerNum++
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}
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if headerNum == 0 {
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return
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}
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if n := headerBufferSize*headerNum - len(p.buf); n > 0 {
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// Do mixing of the current players instead of mixing on the OS side.
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// Apparently, mixing on the Go side is more effient and requires less buffers.
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var volumes []float64
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var bufs [][]byte
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for pl := range p.players {
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buf := make([]byte, n)
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n := pl.read(buf)
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bufs = append(bufs, buf[:n])
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volumes = append(volumes, pl.Volume())
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}
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buf := make([]byte, n)
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switch p.context.bitDepthInBytes {
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case 1:
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const (
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max = 127
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min = -128
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offset = 128
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)
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for i := 0; i < n; i++ {
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var x int16
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for j, b := range bufs {
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if len(b) <= i {
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continue
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}
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xx := int16(b[i]) - offset
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x += int16(float64(xx) * volumes[j])
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}
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if x > max {
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x = max
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}
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if x < min {
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x = min
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}
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buf[i] = byte(x + offset)
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}
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case 2:
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const (
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max = (1 << 15) - 1
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min = -(1 << 15)
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)
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for i := 0; i < n/2; i++ {
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var x int32
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for j, b := range bufs {
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if len(b) <= 2*i {
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continue
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}
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xx := int32(int16(b[2*i]) | (int16(b[2*i+1]) << 8))
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x += int32(float64(xx) * volumes[j])
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}
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if x > max {
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x = max
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}
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if x < min {
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x = min
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}
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buf[2*i] = byte(x)
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buf[2*i+1] = byte(x >> 8)
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}
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}
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p.buf = append(p.buf, buf...)
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}
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for _, h := range p.headers {
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if len(p.buf) < headerBufferSize {
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break
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}
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if h.IsQueued() {
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continue
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}
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if err := h.Write(p.buf[:headerBufferSize]); err != nil {
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// This error can happen when e.g. a new HDMI connection is detected (hajimehoshi/oto#51).
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const errorNotFound = 1168
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if werr := err.(*winmmError); werr.fname == "waveOutWrite" && werr.errno == errorNotFound {
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// TODO: Retry later.
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}
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for pl := range p.players {
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pl.setError(err)
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}
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return
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}
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p.buf = p.buf[headerBufferSize:]
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}
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}
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var thePlayers = players{
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cond: sync.NewCond(&sync.Mutex{}),
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}
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type player struct {
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p *playerImpl
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}
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type playerImpl struct {
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context *context
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src io.Reader
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err error
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state playerState
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buf []byte
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eof bool
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volume float64
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m sync.Mutex
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}
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func (c *context) NewPlayer(src io.Reader) Player {
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p := &player{
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p: &playerImpl{
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context: c,
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src: src,
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volume: 1,
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},
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}
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runtime.SetFinalizer(p, (*player).Close)
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return p
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}
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func (p *player) Err() error {
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return p.p.Err()
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}
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func (p *playerImpl) Err() error {
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p.m.Lock()
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defer p.m.Unlock()
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return p.err
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}
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func (p *player) Play() {
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p.p.Play()
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}
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func (p *playerImpl) Play() {
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// Call Play asynchronously since playImpl might take long.
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ch := make(chan struct{})
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go func() {
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p.m.Lock()
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defer p.m.Unlock()
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close(ch)
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p.playImpl()
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}()
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// Wait until the mutex is locked in the above goroutine.
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<-ch
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}
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func (p *playerImpl) playImpl() {
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if p.err != nil {
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return
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}
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if p.state != playerPaused {
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return
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}
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// thePlayers can has another mutex, and double mutex might introduce a deadlock.
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p.m.Unlock()
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thePlayers.add(p)
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p.m.Lock()
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buf := make([]byte, p.context.maxBufferSize())
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for len(p.buf) < p.context.maxBufferSize() {
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n, err := p.src.Read(buf)
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if err != nil && err != io.EOF {
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p.setErrorImpl(err)
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return
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}
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p.buf = append(p.buf, buf[:n]...)
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if err == io.EOF {
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p.eof = true
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break
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}
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}
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if p.eof && len(p.buf) == 0 {
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return
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}
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p.m.Unlock()
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err := thePlayers.play()
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p.m.Lock()
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if err != nil {
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p.setErrorImpl(err)
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return
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}
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p.state = playerPlay
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// Do not create the player's own loop. Scheduling on Winodws is inefficient compared to the other OSes.
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}
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func (p *player) Pause() {
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p.p.Pause()
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}
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func (p *playerImpl) Pause() {
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p.m.Lock()
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defer p.m.Unlock()
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p.pauseImpl()
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}
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func (p *playerImpl) pauseImpl() {
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if p.err != nil {
|
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return
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}
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if p.state != playerPlay {
|
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return
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}
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|
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p.state = playerPaused
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}
|
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|
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func (p *player) Reset() {
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p.p.Reset()
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}
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func (p *playerImpl) Reset() {
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p.m.Lock()
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defer p.m.Unlock()
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p.resetImpl()
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}
|
||||
|
||||
func (p *playerImpl) resetImpl() {
|
||||
if p.err != nil {
|
||||
return
|
||||
}
|
||||
if p.state == playerClosed {
|
||||
return
|
||||
}
|
||||
|
||||
p.state = playerPaused
|
||||
p.buf = p.buf[:0]
|
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p.eof = false
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}
|
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|
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func (p *player) IsPlaying() bool {
|
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return p.p.IsPlaying()
|
||||
}
|
||||
|
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func (p *playerImpl) IsPlaying() bool {
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p.m.Lock()
|
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defer p.m.Unlock()
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return p.state == playerPlay
|
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}
|
||||
|
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func (p *player) Volume() float64 {
|
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return p.p.Volume()
|
||||
}
|
||||
|
||||
func (p *playerImpl) Volume() float64 {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
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return p.volume
|
||||
}
|
||||
|
||||
func (p *player) SetVolume(volume float64) {
|
||||
p.p.SetVolume(volume)
|
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}
|
||||
|
||||
func (p *playerImpl) SetVolume(volume float64) {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
p.volume = volume
|
||||
}
|
||||
|
||||
func (p *player) UnplayedBufferSize() int {
|
||||
return p.p.UnplayedBufferSize()
|
||||
}
|
||||
|
||||
func (p *playerImpl) UnplayedBufferSize() int {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
return len(p.buf)
|
||||
}
|
||||
|
||||
func (p *player) Close() error {
|
||||
runtime.SetFinalizer(p, nil)
|
||||
return p.p.Close()
|
||||
}
|
||||
|
||||
func (p *playerImpl) Close() error {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
return p.closeImpl()
|
||||
}
|
||||
|
||||
func (p *playerImpl) closeImpl() error {
|
||||
p.state = playerClosed
|
||||
|
||||
p.m.Unlock()
|
||||
err := thePlayers.remove(p)
|
||||
p.m.Lock()
|
||||
|
||||
if err != nil && p.err == nil {
|
||||
p.err = err
|
||||
}
|
||||
return p.err
|
||||
}
|
||||
|
||||
func (p *playerImpl) setError(err error) {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
p.setErrorImpl(err)
|
||||
}
|
||||
|
||||
func (p *playerImpl) setErrorImpl(err error) {
|
||||
p.err = err
|
||||
p.closeImpl()
|
||||
}
|
||||
|
||||
func (p *playerImpl) read(buf []byte) int {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
|
||||
if p.state != playerPlay {
|
||||
return len(buf)
|
||||
}
|
||||
|
||||
if len(p.buf) == 0 && p.eof {
|
||||
p.pauseImpl()
|
||||
return len(buf)
|
||||
}
|
||||
|
||||
if len(p.buf) < p.context.maxBufferSize() {
|
||||
buf := make([]byte, p.context.maxBufferSize())
|
||||
n, err := p.src.Read(buf)
|
||||
if err != nil && err != io.EOF {
|
||||
p.setErrorImpl(err)
|
||||
return len(buf)
|
||||
}
|
||||
|
||||
p.buf = append(p.buf, buf[:n]...)
|
||||
if err == io.EOF {
|
||||
p.eof = true
|
||||
}
|
||||
}
|
||||
|
||||
bytesPerSample := p.context.channelNum * p.context.bitDepthInBytes
|
||||
n := len(p.buf) / bytesPerSample * bytesPerSample
|
||||
n = copy(buf, p.buf[:n])
|
||||
p.buf = p.buf[n:]
|
||||
|
||||
return n
|
||||
}
|
||||
256
audio/internal/readerdriver/winmm_windows.go
Normal file
256
audio/internal/readerdriver/winmm_windows.go
Normal file
@ -0,0 +1,256 @@
|
||||
// Copyright 2021 The Ebiten Authors
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
package readerdriver
|
||||
|
||||
import (
|
||||
"fmt"
|
||||
"runtime"
|
||||
"unsafe"
|
||||
|
||||
"golang.org/x/sys/windows"
|
||||
)
|
||||
|
||||
var (
|
||||
winmm = windows.NewLazySystemDLL("winmm")
|
||||
)
|
||||
|
||||
var (
|
||||
procWaveOutOpen = winmm.NewProc("waveOutOpen")
|
||||
procWaveOutClose = winmm.NewProc("waveOutClose")
|
||||
procWaveOutPause = winmm.NewProc("waveOutPause")
|
||||
procWaveOutPrepareHeader = winmm.NewProc("waveOutPrepareHeader")
|
||||
procWaveOutRestart = winmm.NewProc("waveOutRestart")
|
||||
procWaveOutUnprepareHeader = winmm.NewProc("waveOutUnprepareHeader")
|
||||
procWaveOutWrite = winmm.NewProc("waveOutWrite")
|
||||
)
|
||||
|
||||
type wavehdr struct {
|
||||
lpData uintptr
|
||||
dwBufferLength uint32
|
||||
dwBytesRecorded uint32
|
||||
dwUser uintptr
|
||||
dwFlags uint32
|
||||
dwLoops uint32
|
||||
lpNext uintptr
|
||||
reserved uintptr
|
||||
}
|
||||
|
||||
type waveformatex struct {
|
||||
wFormatTag uint16
|
||||
nChannels uint16
|
||||
nSamplesPerSec uint32
|
||||
nAvgBytesPerSec uint32
|
||||
nBlockAlign uint16
|
||||
wBitsPerSample uint16
|
||||
cbSize uint16
|
||||
}
|
||||
|
||||
const (
|
||||
waveFormatPCM = 1
|
||||
whdrInqueue = 16
|
||||
)
|
||||
|
||||
type mmresult uint
|
||||
|
||||
const (
|
||||
mmsyserrNoerror mmresult = 0
|
||||
mmsyserrError mmresult = 1
|
||||
mmsyserrBaddeviceid mmresult = 2
|
||||
mmsyserrAllocated mmresult = 4
|
||||
mmsyserrInvalidhandle mmresult = 5
|
||||
mmsyserrNodriver mmresult = 6
|
||||
mmsyserrNomem mmresult = 7
|
||||
waverrBadformat mmresult = 32
|
||||
waverrStillplaying mmresult = 33
|
||||
waverrUnprepared mmresult = 34
|
||||
waverrSync mmresult = 35
|
||||
)
|
||||
|
||||
func (m mmresult) String() string {
|
||||
switch m {
|
||||
case mmsyserrNoerror:
|
||||
return "MMSYSERR_NOERROR"
|
||||
case mmsyserrError:
|
||||
return "MMSYSERR_ERROR"
|
||||
case mmsyserrBaddeviceid:
|
||||
return "MMSYSERR_BADDEVICEID"
|
||||
case mmsyserrAllocated:
|
||||
return "MMSYSERR_ALLOCATED"
|
||||
case mmsyserrInvalidhandle:
|
||||
return "MMSYSERR_INVALIDHANDLE"
|
||||
case mmsyserrNodriver:
|
||||
return "MMSYSERR_NODRIVER"
|
||||
case mmsyserrNomem:
|
||||
return "MMSYSERR_NOMEM"
|
||||
case waverrBadformat:
|
||||
return "WAVERR_BADFORMAT"
|
||||
case waverrStillplaying:
|
||||
return "WAVERR_STILLPLAYING"
|
||||
case waverrUnprepared:
|
||||
return "WAVERR_UNPREPARED"
|
||||
case waverrSync:
|
||||
return "WAVERR_SYNC"
|
||||
}
|
||||
return fmt.Sprintf("MMRESULT (%d)", m)
|
||||
}
|
||||
|
||||
type winmmError struct {
|
||||
fname string
|
||||
errno windows.Errno
|
||||
mmresult mmresult
|
||||
}
|
||||
|
||||
func (e *winmmError) Error() string {
|
||||
if e.errno != 0 {
|
||||
return fmt.Sprintf("winmm error at %s: Errno: %d", e.fname, e.errno)
|
||||
}
|
||||
if e.mmresult != mmsyserrNoerror {
|
||||
return fmt.Sprintf("winmm error at %s: %s", e.fname, e.mmresult)
|
||||
}
|
||||
return fmt.Sprintf("winmm error at %s", e.fname)
|
||||
}
|
||||
|
||||
func waveOutOpen(f *waveformatex, callback uintptr) (uintptr, error) {
|
||||
const (
|
||||
waveMapper = 0xffffffff
|
||||
callbackFunction = 0x30000
|
||||
)
|
||||
var w uintptr
|
||||
var fdwOpen uintptr
|
||||
if callback != 0 {
|
||||
fdwOpen |= callbackFunction
|
||||
}
|
||||
r, _, e := procWaveOutOpen.Call(uintptr(unsafe.Pointer(&w)), waveMapper, uintptr(unsafe.Pointer(f)),
|
||||
callback, 0, fdwOpen)
|
||||
runtime.KeepAlive(f)
|
||||
if e.(windows.Errno) != 0 {
|
||||
return 0, &winmmError{
|
||||
fname: "waveOutOpen",
|
||||
errno: e.(windows.Errno),
|
||||
}
|
||||
}
|
||||
if mmresult(r) != mmsyserrNoerror {
|
||||
return 0, &winmmError{
|
||||
fname: "waveOutOpen",
|
||||
mmresult: mmresult(r),
|
||||
}
|
||||
}
|
||||
return w, nil
|
||||
}
|
||||
|
||||
func waveOutClose(hwo uintptr) error {
|
||||
r, _, e := procWaveOutClose.Call(hwo)
|
||||
if e.(windows.Errno) != 0 {
|
||||
return &winmmError{
|
||||
fname: "waveOutClose",
|
||||
errno: e.(windows.Errno),
|
||||
}
|
||||
}
|
||||
if mmresult(r) != mmsyserrNoerror {
|
||||
return &winmmError{
|
||||
fname: "waveOutClose",
|
||||
mmresult: mmresult(r),
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func waveOutPause(hwo uintptr) error {
|
||||
r, _, e := procWaveOutPause.Call(hwo)
|
||||
if e.(windows.Errno) != 0 {
|
||||
return &winmmError{
|
||||
fname: "waveOutPause",
|
||||
errno: e.(windows.Errno),
|
||||
}
|
||||
}
|
||||
if mmresult(r) != mmsyserrNoerror {
|
||||
return &winmmError{
|
||||
fname: "waveOutPause",
|
||||
mmresult: mmresult(r),
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func waveOutPrepareHeader(hwo uintptr, pwh *wavehdr) error {
|
||||
r, _, e := procWaveOutPrepareHeader.Call(hwo, uintptr(unsafe.Pointer(pwh)), unsafe.Sizeof(wavehdr{}))
|
||||
runtime.KeepAlive(pwh)
|
||||
if e.(windows.Errno) != 0 {
|
||||
return &winmmError{
|
||||
fname: "waveOutPrepareHeader",
|
||||
errno: e.(windows.Errno),
|
||||
}
|
||||
}
|
||||
if mmresult(r) != mmsyserrNoerror {
|
||||
return &winmmError{
|
||||
fname: "waveOutPrepareHeader",
|
||||
mmresult: mmresult(r),
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func waveOutRestart(hwo uintptr) error {
|
||||
r, _, e := procWaveOutRestart.Call(hwo)
|
||||
if e.(windows.Errno) != 0 {
|
||||
return &winmmError{
|
||||
fname: "waveOutRestart",
|
||||
errno: e.(windows.Errno),
|
||||
}
|
||||
}
|
||||
if mmresult(r) != mmsyserrNoerror {
|
||||
return &winmmError{
|
||||
fname: "waveOutRestart",
|
||||
mmresult: mmresult(r),
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func waveOutUnprepareHeader(hwo uintptr, pwh *wavehdr) error {
|
||||
r, _, e := procWaveOutUnprepareHeader.Call(hwo, uintptr(unsafe.Pointer(pwh)), unsafe.Sizeof(wavehdr{}))
|
||||
runtime.KeepAlive(pwh)
|
||||
if e.(windows.Errno) != 0 {
|
||||
return &winmmError{
|
||||
fname: "waveOutUnprepareHeader",
|
||||
errno: e.(windows.Errno),
|
||||
}
|
||||
}
|
||||
if mmresult(r) != mmsyserrNoerror {
|
||||
return &winmmError{
|
||||
fname: "waveOutUnprepareHeader",
|
||||
mmresult: mmresult(r),
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func waveOutWrite(hwo uintptr, pwh *wavehdr) error {
|
||||
r, _, e := procWaveOutWrite.Call(hwo, uintptr(unsafe.Pointer(pwh)), unsafe.Sizeof(wavehdr{}))
|
||||
runtime.KeepAlive(pwh)
|
||||
if e.(windows.Errno) != 0 {
|
||||
return &winmmError{
|
||||
fname: "waveOutWrite",
|
||||
errno: e.(windows.Errno),
|
||||
}
|
||||
}
|
||||
if mmresult(r) != mmsyserrNoerror {
|
||||
return &winmmError{
|
||||
fname: "waveOutWrite",
|
||||
mmresult: mmresult(r),
|
||||
}
|
||||
}
|
||||
return nil
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user