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audio/internal/readerdriver: Reimplement Windows audio with the common players
Updates #1710 Updates #1768
This commit is contained in:
Hajime Hoshi
parent
c87e0df8a4
commit
045b14ba21
@ -15,18 +15,14 @@
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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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"fmt"
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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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// The common players in players_unix.go are not used on Windows.
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// Mixing on Go side can cause bigger delays (#1710).
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const headerBufferSize = 2048
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const headerBufferSize = 4096
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func IsAvailable() bool {
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return true
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@ -34,18 +30,18 @@ func IsAvailable() bool {
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type header struct {
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waveOut uintptr
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buffer []byte
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buffer []float32
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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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func newHeader(waveOut uintptr, bufferSizeInBytes 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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buffer: make([]float32, bufferSizeInBytes/4),
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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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dwBufferLength: uint32(bufferSizeInBytes),
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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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@ -53,10 +49,7 @@ func newHeader(waveOut uintptr, bufferSize int) (*header, error) {
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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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func (h *header) Write(data []float32) error {
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copy(h.buffer, data)
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if err := waveOutWrite(h.waveOut, h.waveHdr); err != nil {
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return err
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@ -76,8 +69,17 @@ 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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waveOut uintptr
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headers []*header
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cond *sync.Cond
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players *players
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}
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var theContext *context
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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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@ -86,420 +88,72 @@ func NewContext(sampleRate, channelNum, bitDepthInBytes int) (Context, chan stru
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sampleRate: sampleRate,
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channelNum: channelNum,
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bitDepthInBytes: bitDepthInBytes,
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cond: sync.NewCond(&sync.Mutex{}),
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players: newPlayers(),
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}
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theContext = c
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const bitsPerSample = 32
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nBlockAlign := c.channelNum * bitsPerSample / 8
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f := &waveformatex{
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wFormatTag: waveFormatIEEEFloat,
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nChannels: uint16(c.channelNum),
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nSamplesPerSec: uint32(c.sampleRate),
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nAvgBytesPerSec: uint32(c.sampleRate * nBlockAlign),
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wBitsPerSample: bitsPerSample,
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nBlockAlign: uint16(nBlockAlign),
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}
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// TOOD: What about using an event instead of a callback? PortAudio and other libraries do that.
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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 nil, nil, err
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}
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if err != nil {
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return nil, nil, err
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}
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c.waveOut = w
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c.headers = make([]*header, 0, 4)
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for len(c.headers) < cap(c.headers) {
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h, err := newHeader(c.waveOut, headerBufferSize)
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if err != nil {
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return nil, nil, err
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}
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c.headers = append(c.headers, h)
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}
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go c.loop()
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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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if err := waveOutPause(c.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 (c *context) Resume() error {
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return thePlayers.resume()
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}
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// TODO: Ensure at least one header is queued?
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type players struct {
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players map[uintptr]*playerImpl
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toResume map[*playerImpl]struct{}
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cond *sync.Cond
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}
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func (p *players) add(player *playerImpl, waveOut uintptr) {
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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[uintptr]*playerImpl{}
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}
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runLoop := len(p.players) == 0
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p.players[waveOut] = player
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if runLoop {
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// Use the only one loop. Windows' context switching is not efficent and
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// using too many goroutines might be problematic.
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go p.loop()
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}
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}
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func (p *players) remove(waveOut uintptr) {
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p.cond.L.Lock()
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defer p.cond.L.Unlock()
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pl, ok := p.players[waveOut]
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if !ok {
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return
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}
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delete(p.players, waveOut)
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delete(p.toResume, pl)
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p.cond.Signal()
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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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for _, pl := range p.players {
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if !pl.IsPlaying() {
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continue
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}
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pl.Pause()
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if p.toResume == nil {
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p.toResume = map[*playerImpl]struct{}{}
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}
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p.toResume[pl] = struct{}{}
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if err := waveOutRestart(c.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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for pl := range p.toResume {
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pl.Play()
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delete(p.toResume, pl)
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}
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return nil
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}
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func (p *players) shouldWait() bool {
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if len(p.players) == 0 {
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return false
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}
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for _, pl := range p.players {
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if pl.canProceed() {
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return false
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func (c *context) isHeaderAvailable() bool {
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for _, h := range c.headers {
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if !h.IsQueued() {
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return true
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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 len(p.players) > 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.cond.L.Lock()
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for _, pl := range p.players {
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pl.readAndWriteBuffer()
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}
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p.cond.L.Unlock()
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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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waveOut uintptr
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state playerState
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headers []*header
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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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if p.waveOut == 0 {
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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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// TOOD: What about using an event instead of a callback? PortAudio and other libraries do that.
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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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p.setErrorImpl(err)
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return
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}
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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.waveOut = w
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p.headers = make([]*header, 0, 6)
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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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p.setErrorImpl(err)
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return
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}
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p.headers = append(p.headers, h)
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}
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thePlayers.add(p, p.waveOut)
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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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// Set the state first as readAndWriteBufferImpl checks the current player state.
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p.state = playerPlay
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// Call readAndWriteBufferImpl to ensure at least one header is queued.
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p.readAndWriteBufferImpl()
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if err := waveOutRestart(p.waveOut); err != nil {
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p.setErrorImpl(err)
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return
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}
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// Switching goroutines is very inefficient on Windows. Avoid a dedicated goroutine for a player.
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}
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func (p *playerImpl) queuedHeadersNum() int {
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var c int
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for _, h := range p.headers {
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if h.IsQueued() {
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c++
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}
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}
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return c
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}
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func (p *playerImpl) canProceed() bool {
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p.m.Lock()
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defer p.m.Unlock()
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return p.queuedHeadersNum() < len(p.headers) && p.state == playerPlay
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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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if p.waveOut == 0 {
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return
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}
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// waveOutPause never return when there is no queued header.
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if p.queuedHeadersNum() > 0 {
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if err := waveOutPause(p.waveOut); err != nil {
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p.setErrorImpl(err)
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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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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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}
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func (p *playerImpl) resetImpl() {
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if p.err != nil {
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return
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}
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if p.state == playerClosed {
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return
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}
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if p.waveOut == 0 {
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return
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}
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// waveOutReset and waveOutPause never return when there is no queued header.
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if p.queuedHeadersNum() > 0 {
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err := waveOutReset(p.waveOut)
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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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err = waveOutPause(p.waveOut)
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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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}
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// Now all the headers are WHDR_DONE. Recreate the headers.
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for i, h := range p.headers {
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if err := h.Close(); err != nil {
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p.setErrorImpl(err)
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return
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}
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h, err := newHeader(p.waveOut, headerBufferSize)
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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.headers[i] = h
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}
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p.state = playerPaused
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p.buf = p.buf[:0]
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p.eof = false
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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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}
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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()
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}
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func (p *playerImpl) Volume() float64 {
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p.m.Lock()
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defer p.m.Unlock()
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return p.volume
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}
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func (p *player) SetVolume(volume float64) {
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p.p.SetVolume(volume)
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}
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func (p *playerImpl) SetVolume(volume float64) {
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p.m.Lock()
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defer p.m.Unlock()
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p.volume = volume
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}
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func (p *player) UnplayedBufferSize() int {
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return p.p.UnplayedBufferSize()
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}
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func (p *playerImpl) UnplayedBufferSize() int {
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p.m.Lock()
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defer p.m.Unlock()
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return len(p.buf)
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}
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func (p *player) Close() error {
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runtime.SetFinalizer(p, nil)
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return p.p.Close()
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}
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func (p *playerImpl) Close() error {
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p.m.Lock()
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defer p.m.Unlock()
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return p.closeImpl()
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}
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func (p *playerImpl) closeImpl() error {
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p.state = playerClosed
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if p.waveOut != 0 {
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for _, h := range p.headers {
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if err := h.Close(); err != nil && p.err == nil {
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p.err = 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 && p.err == nil {
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p.err = err
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}
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// This player's lock might block thePlayer's lock. Unlock this first.
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p.m.Unlock()
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thePlayers.remove(p.waveOut)
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p.m.Lock()
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p.waveOut = 0
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}
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return p.err
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return false
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}
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var waveOutOpenCallback = windows.NewCallbackCDecl(func(hwo, uMsg, dwInstance, dwParam1, dwParam2 uintptr) uintptr {
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@ -507,92 +161,36 @@ var waveOutOpenCallback = windows.NewCallbackCDecl(func(hwo, uMsg, dwInstance, d
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if uMsg != womDone {
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||||
return 0
|
||||
}
|
||||
thePlayers.cond.Signal()
|
||||
theContext.cond.Signal()
|
||||
return 0
|
||||
})
|
||||
|
||||
func (p *playerImpl) readAndWriteBuffer() {
|
||||
p.m.Lock()
|
||||
defer p.m.Unlock()
|
||||
p.readAndWriteBufferImpl()
|
||||
func (c *context) loop() {
|
||||
buf32 := make([]float32, headerBufferSize/4)
|
||||
for {
|
||||
c.appendBuffer(buf32)
|
||||
}
|
||||
}
|
||||
|
||||
func (p *playerImpl) readAndWriteBufferImpl() {
|
||||
if p.state != playerPlay {
|
||||
return
|
||||
func (c *context) appendBuffer(buf32 []float32) {
|
||||
c.cond.L.Lock()
|
||||
defer c.cond.L.Unlock()
|
||||
|
||||
for !c.isHeaderAvailable() {
|
||||
c.cond.Wait()
|
||||
}
|
||||
|
||||
for len(p.buf) < p.context.maxBufferSize() && !p.eof {
|
||||
buf := make([]byte, p.context.maxBufferSize())
|
||||
n, err := p.src.Read(buf)
|
||||
if err != nil && err != io.EOF {
|
||||
p.setErrorImpl(err)
|
||||
return
|
||||
}
|
||||
p.buf = append(p.buf, buf[:n]...)
|
||||
if err == io.EOF {
|
||||
if len(p.buf) == 0 {
|
||||
p.eof = true
|
||||
}
|
||||
break
|
||||
}
|
||||
for i := range buf32 {
|
||||
buf32[i] = 0
|
||||
}
|
||||
c.players.read(buf32)
|
||||
|
||||
for _, h := range p.headers {
|
||||
if len(p.buf) == 0 {
|
||||
break
|
||||
}
|
||||
for _, h := range c.headers {
|
||||
if h.IsQueued() {
|
||||
continue
|
||||
}
|
||||
|
||||
n := headerBufferSize
|
||||
if n > len(p.buf) {
|
||||
n = len(p.buf)
|
||||
}
|
||||
buf := p.buf[:n]
|
||||
|
||||
// Adjust the volume
|
||||
if p.volume < 1 {
|
||||
switch p.context.bitDepthInBytes {
|
||||
case 1:
|
||||
const (
|
||||
max = 127
|
||||
min = -128
|
||||
offset = 128
|
||||
)
|
||||
for i, b := range buf {
|
||||
x := int16(b) - offset
|
||||
x = int16(float64(x) * p.volume)
|
||||
if x > max {
|
||||
x = max
|
||||
}
|
||||
if x < min {
|
||||
x = min
|
||||
}
|
||||
buf[i] = byte(x + offset)
|
||||
}
|
||||
case 2:
|
||||
const (
|
||||
max = (1 << 15) - 1
|
||||
min = -(1 << 15)
|
||||
)
|
||||
for i := 0; i < n/2; i++ {
|
||||
x := int32(int16(buf[2*i]) | (int16(buf[2*i+1]) << 8))
|
||||
x = int32(float64(x) * p.volume)
|
||||
if x > max {
|
||||
x = max
|
||||
}
|
||||
if x < min {
|
||||
x = min
|
||||
}
|
||||
buf[2*i] = byte(x)
|
||||
buf[2*i+1] = byte(x >> 8)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if err := h.Write(buf); err != nil {
|
||||
if err := h.Write(buf32); err != nil {
|
||||
// This error can happen when e.g. a new HDMI connection is detected (hajimehoshi/oto#51).
|
||||
const errorNotFound = 1168
|
||||
if werr := err.(*winmmError); werr.fname == "waveOutWrite" {
|
||||
@ -603,24 +201,9 @@ func (p *playerImpl) readAndWriteBufferImpl() {
|
||||
// TODO: Retry later.
|
||||
}
|
||||
}
|
||||
p.setErrorImpl(err)
|
||||
return
|
||||
// TODO: Treat the error corretly
|
||||
panic(fmt.Errorf("readerdriver: Queueing the header failed: %v", err))
|
||||
}
|
||||
|
||||
p.buf = p.buf[n:]
|
||||
|
||||
// 4 is an arbitrary number that doesn't cause a problem at examples/piano (#1653).
|
||||
if p.queuedHeadersNum() >= 4 {
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
if p.queuedHeadersNum() == 0 && p.eof {
|
||||
p.pauseImpl()
|
||||
return
|
||||
}
|
||||
}
|
||||
|
||||
func (p *playerImpl) setErrorImpl(err error) {
|
||||
p.err = err
|
||||
p.closeImpl()
|
||||
}
|
||||
|
||||
@ -12,8 +12,8 @@
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
|
||||
//go:build !js && !windows
|
||||
// +build !js,!windows
|
||||
//go:build !js
|
||||
// +build !js
|
||||
|
||||
package readerdriver
|
||||
|
||||
@ -59,8 +59,8 @@ type waveformatex struct {
|
||||
}
|
||||
|
||||
const (
|
||||
waveFormatPCM = 1
|
||||
whdrInqueue = 16
|
||||
waveFormatIEEEFloat = 3
|
||||
whdrInqueue = 16
|
||||
)
|
||||
|
||||
type mmresult uint
|
||||
|
||||
Loading…
Reference in New Issue
Block a user