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