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pipeline.go
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pipeline.go
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package gst
/*
#cgo pkg-config: gstreamer-1.0
#include "gst.h"
*/
import "C"
import (
"errors"
"fmt"
"runtime"
"unsafe"
)
type Pipeline struct {
Bin
}
func ParseLaunch(pipelineStr string) (p *Pipeline, err error) {
var gError *C.GError
pDesc := (*C.gchar)(unsafe.Pointer(C.CString(pipelineStr)))
defer C.g_free(C.gpointer(unsafe.Pointer(pDesc)))
gstElt := C.gst_parse_launch(pDesc, &gError)
if gError != nil {
err = errors.New("create pipeline error")
return
}
p = &Pipeline{}
p.GstElement = gstElt
runtime.SetFinalizer(p, func(p *Pipeline) {
C.gst_object_unref(C.gpointer(unsafe.Pointer(p.GstElement)))
})
return
}
func PipelineNew(name string) (e *Pipeline, err error) {
var pName *C.gchar
if name == "" {
pName = nil
} else {
pName := (*C.gchar)(unsafe.Pointer(C.CString(name)))
defer C.g_free(C.gpointer(unsafe.Pointer(pName)))
}
gstElt := C.gst_pipeline_new(pName)
if gstElt == nil {
err = errors.New(fmt.Sprintf("could not create a Gstreamer pipeline name %s", name))
return
}
e = &Pipeline{}
e.GstElement = gstElt
runtime.SetFinalizer(e, func(e *Pipeline) {
C.gst_object_unref(C.gpointer(unsafe.Pointer(e.GstElement)))
})
return
}
func (p *Pipeline) SetState(state State) StateChangeReturn {
return StateChangeReturn(C.gst_element_set_state(p.GstElement, C.GstState(state)))
}
func (p *Pipeline) GetState(timeout_ns int64) (state, pending State, ret StateChangeReturn) {
ret = StateChangeReturn(C.gst_element_get_state(
p.GstElement, state.g(), pending.g(), C.GstClockTime(timeout_ns),
))
return
}
func (p *Pipeline) SeekSimple(millisec int64) bool {
res:= C.gst_element_seek_simple(p.GstElement, C.GST_FORMAT_TIME,
C.GST_SEEK_FLAG_FLUSH, C.gint64(millisec*1000000))
if res>0 {
return true
}
return false
}
func (p *Pipeline) GetBus() (bus *Bus) {
CBus := C.X_gst_pipeline_get_bus(p.GstElement)
bus = &Bus{
C: CBus,
}
runtime.SetFinalizer(bus, func(bus *Bus) {
C.gst_object_unref(C.gpointer(unsafe.Pointer(bus.C)))
})
return
}
func (p *Pipeline) GetClock() (clock *Clock) {
CElementClock := C.X_gst_pipeline_get_clock(p.GstElement)
clock = &Clock{
C: CElementClock,
}
runtime.SetFinalizer(clock, func(clock *Clock) {
C.gst_object_unref(C.gpointer(unsafe.Pointer(clock.C)))
})
return
}
func (p *Pipeline) GetDelay() uint64 {
CClockTime := C.X_gst_pipeline_get_delay(p.GstElement)
return uint64(CClockTime)
}
func (p *Pipeline) GetLatency() uint64 {
CClockTime := C.X_gst_pipeline_get_latency(p.GstElement)
return uint64(CClockTime)
}
func (p *Pipeline) SetLatency(latency uint64) {
C.X_gst_pipeline_set_latency(p.GstElement, C.GstClockTime(latency))
}