mirror of https://bitbucket.org/ausocean/av.git
82 lines
1.9 KiB
Go
82 lines
1.9 KiB
Go
package main
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import (
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"bytes"
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"reflect"
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"syscall/js"
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"unsafe"
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"bitbucket.org/ausocean/av/codec/adpcm"
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)
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func main() {
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dec := NewDecoder()
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dec.Start()
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}
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// Decoder is a client side adpcm decoder
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type Decoder struct {
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inBuf []uint8
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onImgLoadCb, initMemCb, getDecLenCb js.Func
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console js.Value
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done chan struct{}
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}
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// NewDecoder returns a new instance of decoder
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func NewDecoder() *Decoder {
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return &Decoder{
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console: js.Global().Get("console"),
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done: make(chan struct{}),
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}
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}
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func (s *Decoder) setupOnImgLoadCb() {
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s.onImgLoadCb = js.FuncOf(func(this js.Value, args []js.Value) interface{} {
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// reader := bytes.NewReader(s.inBuf)
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//DECODING HAPPENS HERE
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decoded := bytes.NewBuffer(make([]byte, 0, len(s.inBuf)*4))
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dec := adpcm.NewDecoder(decoded)
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dec.Write(s.inBuf)
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s.inBuf = decoded.Bytes()
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return nil
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})
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}
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func (s *Decoder) setupInitMemCb() {
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// The length of the data array buffer is passed.
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// Then the buf slice is initialized to that length.
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// A pointer to that slice is passed back to the browser.
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s.initMemCb = js.FuncOf(func(this js.Value, i []js.Value) interface{} {
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length := i[0].Int()
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s.console.Call("log", "length:", length)
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s.inBuf = make([]uint8, length)
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hdr := (*reflect.SliceHeader)(unsafe.Pointer(&s.inBuf))
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ptr := uintptr(unsafe.Pointer(hdr.Data))
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s.console.Call("log", "ptr:", ptr)
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js.Global().Call("gotMem", ptr)
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return nil
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})
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}
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func (s *Decoder) setupGetDecLenCb() {
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s.getDecLenCb = js.FuncOf(func(this js.Value, i []js.Value) interface{} {
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return len(s.inBuf)
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})
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}
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// Start sets up all the callbacks and waits for the close signal
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// to be sent from the browser.
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func (s *Decoder) Start() {
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s.setupInitMemCb()
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js.Global().Set("initMem", s.initMemCb)
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s.setupOnImgLoadCb()
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js.Global().Set("loadData", s.onImgLoadCb)
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s.setupGetDecLenCb()
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js.Global().Set("getDecLen", s.getDecLenCb)
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<-s.done
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}
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