Stu Leak
68df790d27
Major improvements to UnifiedPlayer: 1. GetFrameImage() now works when paused for responsive UI updates 2. Play() method properly starts FFmpeg process 3. Frame display loop runs continuously for smooth video display 4. Disabled audio temporarily to fix video playback fundamentals 5. Simplified FFmpeg command to focus on video stream only Player now: - Generates video frames correctly - Shows video when paused - Has responsive progress tracking - Starts playback properly Next steps: Re-enable audio playback once video is stable
93 lines
2.0 KiB
Go
93 lines
2.0 KiB
Go
//go:build !migrated_fynedo
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package async
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import (
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"sync/atomic"
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"fyne.io/fyne/v2"
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)
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// CanvasObjectQueue implements lock-free FIFO freelist based queue.
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//
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// Reference: https://dl.acm.org/citation.cfm?doid=248052.248106
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type CanvasObjectQueue struct {
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head atomic.Pointer[itemCanvasObject]
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tail atomic.Pointer[itemCanvasObject]
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len atomic.Uint64
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}
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// NewCanvasObjectQueue returns a queue for caching values.
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func NewCanvasObjectQueue() *CanvasObjectQueue {
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head := &itemCanvasObject{}
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queue := &CanvasObjectQueue{}
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queue.head.Store(head)
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queue.tail.Store(head)
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return queue
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}
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type itemCanvasObject struct {
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next atomic.Pointer[itemCanvasObject]
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v fyne.CanvasObject
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}
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var itemCanvasObjectPool = Pool[*itemCanvasObject]{
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New: func() *itemCanvasObject { return &itemCanvasObject{} },
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}
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// In puts the given value at the tail of the queue.
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func (q *CanvasObjectQueue) In(v fyne.CanvasObject) {
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i := itemCanvasObjectPool.Get()
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i.next.Store(nil)
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i.v = v
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var last, lastnext *itemCanvasObject
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for {
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last = q.tail.Load()
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lastnext = last.next.Load()
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if q.tail.Load() == last {
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if lastnext == nil {
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if last.next.CompareAndSwap(lastnext, i) {
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q.tail.CompareAndSwap(last, i)
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q.len.Add(1)
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return
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}
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} else {
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q.tail.CompareAndSwap(last, lastnext)
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}
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}
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}
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}
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// Out removes and returns the value at the head of the queue.
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// It returns nil if the queue is empty.
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func (q *CanvasObjectQueue) Out() fyne.CanvasObject {
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var first, last, firstnext *itemCanvasObject
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for {
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first = q.head.Load()
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last = q.tail.Load()
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firstnext = first.next.Load()
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if first == q.head.Load() {
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if first == last {
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if firstnext == nil {
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return nil
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}
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q.tail.CompareAndSwap(last, firstnext)
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} else {
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v := firstnext.v
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if q.head.CompareAndSwap(first, firstnext) {
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q.len.Add(^uint64(0))
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itemCanvasObjectPool.Put(first)
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return v
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}
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}
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}
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}
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}
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// Len returns the length of the queue.
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func (q *CanvasObjectQueue) Len() uint64 {
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return q.len.Load()
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}
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