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subclassing working! regenerate with gotk4

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This commit is contained in:
RSWilli
2025-09-16 22:36:08 +02:00
parent e5a18b1d12
commit 517e791e33
29 changed files with 7992 additions and 2720 deletions
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51
examples/plugins/registered_elements/internal/customsrc/element.go
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@@ -1,6 +1,8 @@
package customsrc
import (
"fmt"
"log"
"math"
"time"
@@ -13,6 +15,33 @@ const samplesperbuffer = 4800
const samplerate = 48000
func classInit(class *gst.BinClass) {
class.ParentClass().SetStaticMetadata(
"custom test source",
"Src/Test",
"Demo source bin with volume",
"Wilhelm Bartel <bartel.wilhelm@gmail.com>",
)
class.ParentClass().AddPadTemplate(gst.NewPadTemplate(
"src",
gst.PadSrc,
gst.PadAlways,
gst.CapsFromString(fmt.Sprintf("audio/x-raw,channels=2,rate=%d", samplerate)),
))
class.ParentClass().ParentClass().ParentClass().ParentClass().InstallProperties([]*gobject.ParamSpec{
gobject.ParamSpecInt64(
"duration",
"duration",
"Duration of the source in nanoseconds",
0,
math.MaxInt64,
0,
gobject.ParamReadwrite|gobject.ParamConstruct),
})
}
type customSrc struct {
gst.BinInstance // parent must be embedded as the first field
@@ -24,7 +53,9 @@ type customSrc struct {
// InstanceInit should initialize the element. Keep in mind that the properties are not yet present. When this is called.
func (bin *customSrc) init() {
bin.source = gst.ElementFactoryMake("audiotestsrc", "")
bin.source = gst.ElementFactoryMakeWithProperties("audiotestsrc", map[string]any{
"samplesperbuffer": samplesperbuffer,
})
bin.volume = gst.ElementFactoryMake("volume", "")
bin.AddMany(
@@ -49,7 +80,8 @@ func (bin *customSrc) init() {
func (bin *customSrc) setProperty(_ uint, value any, pspec *gobject.ParamSpec) {
switch pspec.Name() {
case "duration":
bin.Duration = value.(time.Duration)
bin.Duration = time.Duration(value.(int64)) // declared as int64 property in classInit
log.Printf("set duration to %s", bin.Duration)
bin.updateSource()
default:
panic("unknown property")
@@ -59,7 +91,7 @@ func (bin *customSrc) setProperty(_ uint, value any, pspec *gobject.ParamSpec) {
func (bin *customSrc) getProperty(_ uint, pspec *gobject.ParamSpec) any {
switch pspec.Name() {
case "duration":
return bin.Duration
return int64(bin.Duration) // declared as int64 property in classInit
default:
panic("unknown property")
}
@@ -67,9 +99,14 @@ func (bin *customSrc) getProperty(_ uint, pspec *gobject.ParamSpec) any {
// updateSource will get called to update the audiotestsrc when a property changes
func (s *customSrc) updateSource() {
if s.source != nil {
numBuffers := (float64(s.Duration / time.Second)) / (float64(samplesperbuffer) / float64(samplerate))
s.source.SetObjectProperty("num-buffers", int(math.Ceil(numBuffers)))
if s.source == nil {
// the construct param may be set before we initialized the source
return
}
numBuffers := (float64(s.Duration / time.Second)) / (float64(samplesperbuffer) / float64(samplerate))
s.source.SetObjectProperty("num-buffers", int32(math.Ceil(numBuffers)))
log.Printf("set num-buffers to %d", int(math.Ceil(numBuffers)))
}