Files
go-gst/gst/gst_app_src.go
2020-09-24 21:34:29 +03:00

85 lines
2.8 KiB
Go

package gst
/*
#cgo pkg-config: gstreamer-1.0 gstreamer-app-1.0
#cgo CFLAGS: -Wno-deprecated-declarations -g -Wall
#include <gst/gst.h>
#include <gst/app/gstappsrc.h>
#include "gst.go.h"
*/
import "C"
import (
"io"
"io/ioutil"
"time"
"unsafe"
)
// AppSrc wraps an Element object with additional methods for pushing samples.
type AppSrc struct{ *Element }
// NewAppSrc returns a new AppSrc element.
func NewAppSrc() (*AppSrc, error) {
elem, err := NewElement("appsrc")
if err != nil {
return nil, err
}
return wrapAppSrc(elem), nil
}
// Instance returns the native GstAppSink instance.
func (a *AppSrc) Instance() *C.GstAppSrc { return C.toGstAppSrc(a.unsafe()) }
// SetSize sets the size of the source stream in bytes. You should call this for
// streams of fixed length.
func (a *AppSrc) SetSize(size int64) {
C.gst_app_src_set_size((*C.GstAppSrc)(a.Instance()), (C.gint64)(size))
}
// SetDuration sets the duration of the source stream. You should call
// this if the value is known.
func (a *AppSrc) SetDuration(dur time.Duration) {
C.gst_app_src_set_duration((*C.GstAppSrc)(a.Instance()), (C.ulong)(dur.Nanoseconds()))
}
// EndStream signals to the app source that the stream has ended after the last queued
// buffer.
func (a *AppSrc) EndStream() FlowReturn {
ret := C.gst_app_src_end_of_stream((*C.GstAppSrc)(a.Instance()))
return FlowReturn(ret)
}
// SetLive sets whether or not this is a live stream.
func (a *AppSrc) SetLive(b bool) error { return a.Set("is-live", b) }
// PushBuffer pushes a buffer to the appsrc. Currently by default this will block
// until the source is ready to accept the buffer.
func (a *AppSrc) PushBuffer(data io.Reader) FlowReturn {
out, err := ioutil.ReadAll(data)
if err != nil {
return FlowError
}
str := string(out)
p := unsafe.Pointer(C.CString(str))
defer C.free(p)
buf := C.gst_buffer_new_wrapped((C.gpointer)(p), C.ulong(len(str)))
ret := C.gst_app_src_push_buffer((*C.GstAppSrc)(a.Instance()), (*C.GstBuffer)(buf))
return FlowReturn(ret)
}
// FlowReturn is go type casting for GstFlowReturn.
type FlowReturn C.GstFlowReturn
// Type casting of the GstFlowReturn types. Custom ones are omitted for now.
const (
FlowOK FlowReturn = C.GST_FLOW_OK // Data passing was ok
FlowNotLinked = C.GST_FLOW_NOT_LINKED // Pad is not linked
FlowFlushing = C.GST_FLOW_FLUSHING // Pad is flushing
FlowEOS = C.GST_FLOW_EOS // Pad is EOS
FlowNotNegotiated = C.GST_FLOW_NOT_NEGOTIATED // Pad is not negotiated
FlowError = C.GST_FLOW_ERROR // Some (fatal) error occurred
FlowNotSupported = C.GST_FLOW_NOT_SUPPORTED // The operation is not supported.
)
func wrapAppSrc(elem *Element) *AppSrc { return &AppSrc{elem} }