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element.go
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element.go
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package gst
/*
#cgo pkg-config: gstreamer-1.0 gstreamer-app-1.0
#include "gst.h"
*/
import "C"
import (
"errors"
"fmt"
"math/rand"
"reflect"
"runtime"
"sync"
"time"
"unsafe"
)
var (
mutex sync.Mutex
callbackStore = map[uint64]*Element{}
)
type PadAddedCallback func(element *Element, pad *Pad)
type StateOptions int
const (
StateVoidPending StateOptions = C.GST_STATE_VOID_PENDING
StateNull StateOptions = C.GST_STATE_NULL
StateReady StateOptions = C.GST_STATE_READY
StatePaused StateOptions = C.GST_STATE_PAUSED
StatePlaying StateOptions = C.GST_STATE_PLAYING
)
type StateChangeReturn int
const (
StateChangeFailure StateChangeReturn = C.GST_STATE_CHANGE_FAILURE
StateChangeSuccess StateChangeReturn = C.GST_STATE_CHANGE_SUCCESS
StateChangeAsync StateChangeReturn = C.GST_STATE_CHANGE_ASYNC
StateChangePreroll StateChangeReturn = C.GST_STATE_CHANGE_NO_PREROLL
)
type SeekFlags int
const (
SeekFlagNone SeekFlags = C.GST_SEEK_FLAG_NONE
SeekFlagFlush SeekFlags = C.GST_SEEK_FLAG_FLUSH
SeekFlagAccurate SeekFlags = C.GST_SEEK_FLAG_ACCURATE
SeekFlagKeyUnit SeekFlags = C.GST_SEEK_FLAG_KEY_UNIT
SeekFlagSegment SeekFlags = C.GST_SEEK_FLAG_SEGMENT
SeekFlagTrickmode SeekFlags = C.GST_SEEK_FLAG_TRICKMODE
SeekFlagSkip SeekFlags = C.GST_SEEK_FLAG_SKIP
SeekFlagSnapBefore SeekFlags = C.GST_SEEK_FLAG_SNAP_BEFORE
SeekFlagSnapAfter SeekFlags = C.GST_SEEK_FLAG_SNAP_AFTER
SeekFlagSnapNearest SeekFlags = C.GST_SEEK_FLAG_SNAP_NEAREST
SeekFlagTrickmodeKeyUnits SeekFlags = C.GST_SEEK_FLAG_TRICKMODE_KEY_UNITS
SeekFlagTrickmodeNoAudio SeekFlags = C.GST_SEEK_FLAG_TRICKMODE_NO_AUDIO
SeekFlagTrickmodeForwardPredicted SeekFlags = C.GST_SEEK_FLAG_TRICKMODE_FORWARD_PREDICTED
SeekFlagInstantRateChange SeekFlags = C.GST_SEEK_FLAG_INSTANT_RATE_CHANGE
)
type Element struct {
GstElement *C.GstElement
onPadAdded PadAddedCallback
callbackID uint64
}
func (e *Element) Name() (name string) {
n := (*C.char)(unsafe.Pointer(C.gst_object_get_name((*C.GstObject)(unsafe.Pointer(e.GstElement)))))
if n != nil {
name = string(nonCopyCString(n, C.int(C.strlen(n))))
}
return
}
func (e *Element) DumpDot(filePath string) {
n := (*C.gchar)(unsafe.Pointer(C.CString(filePath)))
defer C.g_free(C.gpointer(unsafe.Pointer(n)))
C.X_GST_DEBUG_BIN_TO_DOT_FILE(e.GstElement, n)
}
func (e *Element) Link(dst *Element) bool {
result := C.gst_element_link(e.GstElement, dst.GstElement)
if result == C.TRUE {
return true
}
return false
}
func (e *Element) GetPadTemplate(name string) (padTemplate *PadTemplate) {
n := (*C.gchar)(unsafe.Pointer(C.CString(name)))
defer C.g_free(C.gpointer(unsafe.Pointer(n)))
CPadTemplate := C.gst_element_class_get_pad_template(C.X_GST_ELEMENT_GET_CLASS(e.GstElement), n)
padTemplate = &PadTemplate{
C: CPadTemplate,
}
return
}
func (e *Element) GetRequestPad(padTemplate *PadTemplate, name string, caps *Caps) (pad *Pad) {
var n *C.gchar
var c *C.GstCaps
if name == "" {
n = nil
} else {
n = (*C.gchar)(unsafe.Pointer(C.CString(name)))
defer C.g_free(C.gpointer(unsafe.Pointer(n)))
}
if caps == nil {
c = nil
} else {
c = caps.caps
}
CPad := C.gst_element_request_pad(e.GstElement, padTemplate.C, n, c)
pad = &Pad{
pad: CPad,
}
return
}
func (e *Element) GetStaticPad(name string) (pad *Pad) {
n := (*C.gchar)(unsafe.Pointer(C.CString(name)))
defer C.g_free(C.gpointer(unsafe.Pointer(n)))
CPad := C.gst_element_get_static_pad(e.GstElement, n)
pad = &Pad{
pad: CPad,
}
return
}
func (e *Element) Query(q *Query) bool {
Cboolean := C.gst_element_query(e.GstElement, q.C)
return Cboolean == 1
}
func (e *Element) QueryPosition() (time.Duration, error) {
var position C.gint64
if int(C.gst_element_query_position(e.GstElement, C.GST_FORMAT_TIME, &position)) == 0 {
return 0, fmt.Errorf("position query failed")
}
return time.Duration(position/C.GST_SECOND) * time.Second, nil
}
func (e *Element) QueryDuration() (time.Duration, error) {
var duration C.gint64
if int(C.gst_element_query_duration(e.GstElement, C.GST_FORMAT_TIME, &duration)) == 0 {
return 0, fmt.Errorf("duration query failed")
}
return time.Duration(duration/C.GST_SECOND) * time.Second, nil
}
func (e *Element) AddPad(pad *Pad) bool {
Cret := C.gst_element_add_pad(e.GstElement, pad.pad)
if Cret == 1 {
return true
}
return false
}
func (e *Element) GetClockBaseTime() uint64 {
CClockTime := C.gst_element_get_base_time(e.GstElement)
return uint64(CClockTime)
}
func (e *Element) GetClock() (gstClock *Clock) {
CElementClock := C.gst_element_get_clock(e.GstElement)
gstClock = &Clock{
C: CElementClock,
}
runtime.SetFinalizer(gstClock, func(gstClock *Clock) {
C.gst_object_unref(C.gpointer(unsafe.Pointer(gstClock.C)))
})
return
}
func (e *Element) EndOfStream() (err error) {
// EndOfStream signals that the appsrc will not receive any further
// input via PushBuffer and permits the pipeline to finish properly.
var gstReturn C.GstFlowReturn
gstReturn = C.gst_app_src_end_of_stream((*C.GstAppSrc)(unsafe.Pointer(e.GstElement)))
if gstReturn != C.GST_FLOW_OK {
err = errors.New("could not send end_of_stream")
}
return
}
func (e *Element) PushBuffer(data []byte) (err error) {
b := C.CBytes(data)
defer C.free(b)
var gstReturn C.GstFlowReturn
gstReturn = C.X_gst_app_src_push_buffer(e.GstElement, b, C.int(len(data)))
if gstReturn != C.GST_FLOW_OK {
err = errors.New("could not push buffer on appsrc element")
return
}
return
}
func (e *Element) PullSample() (sample *Sample, err error) {
CGstSample := C.gst_app_sink_pull_sample((*C.GstAppSink)(unsafe.Pointer(e.GstElement)))
if CGstSample == nil {
err = errors.New("could not pull a sample from appsink")
return
}
gstBuffer := C.gst_sample_get_buffer(CGstSample)
if gstBuffer == nil {
err = errors.New("could not pull a sample from appsink")
return
}
mapInfo := (*C.GstMapInfo)(unsafe.Pointer(C.malloc(C.sizeof_GstMapInfo)))
defer C.free(unsafe.Pointer(mapInfo))
if int(C.X_gst_buffer_map(gstBuffer, mapInfo)) == 0 {
err = errors.New(fmt.Sprintf("could not map gstBuffer %#v", gstBuffer))
return
}
CData := (*[1 << 30]byte)(unsafe.Pointer(mapInfo.data))
data := make([]byte, int(mapInfo.size))
copy(data, CData[:])
duration := uint64(C.X_gst_buffer_get_duration(gstBuffer))
pts := uint64(C.X_gst_buffer_get_pts(gstBuffer))
dts := uint64(C.X_gst_buffer_get_dts(gstBuffer))
offset := uint64(C.X_gst_buffer_get_offset(gstBuffer))
sample = &Sample{
Data: data,
Duration: duration,
Pts: pts,
Dts: dts,
Offset: offset,
}
C.gst_buffer_unmap(gstBuffer, mapInfo)
C.gst_sample_unref(CGstSample)
return
}
// appsink
func (e *Element) IsEOS() bool {
Cbool := C.gst_app_sink_is_eos((*C.GstAppSink)(unsafe.Pointer(e.GstElement)))
if Cbool == 1 {
return true
}
return false
}
func (e *Element) SetObject(name string, value interface{}) {
cname := (*C.gchar)(unsafe.Pointer(C.CString(name)))
defer C.g_free(C.gpointer(unsafe.Pointer(cname)))
switch value.(type) {
case string:
str := (*C.gchar)(unsafe.Pointer(C.CString(value.(string))))
defer C.g_free(C.gpointer(unsafe.Pointer(str)))
C.X_gst_g_object_set_string(e.GstElement, cname, str)
case int:
C.X_gst_g_object_set_int(e.GstElement, cname, C.gint(value.(int)))
case uint32:
C.X_gst_g_object_set_uint(e.GstElement, cname, C.guint(value.(uint32)))
case bool:
var cvalue int
if value.(bool) == true {
cvalue = 1
} else {
cvalue = 0
}
C.X_gst_g_object_set_bool(e.GstElement, cname, C.gboolean(cvalue))
case float64:
C.X_gst_g_object_set_gdouble(e.GstElement, cname, C.gdouble(value.(float64)))
case *Caps:
caps := value.(*Caps)
C.X_gst_g_object_set_caps(e.GstElement, cname, caps.caps)
case *Structure:
structure := value.(*Structure)
C.X_gst_g_object_set_structure(e.GstElement, cname, structure.C)
case *Element:
element := value.(*Element)
C.X_gst_g_object_set_element(e.GstElement, cname, element.GstElement)
default:
panic(fmt.Errorf("SetObject: don't know how to set value for type %T", value))
}
}
func (e *Element) SendEvent(event *Event) bool {
Cbool := C.gst_element_send_event(e.GstElement, event.GstEvent)
if Cbool == 1 {
return true
}
return false
}
func (e *Element) SetState(state StateOptions) StateChangeReturn {
Cint := C.gst_element_set_state(e.GstElement, C.GstState(state))
return StateChangeReturn(Cint)
}
func (e *Element) GetBus() (bus *Bus) {
CBus := C.X_gst_element_get_bus(e.GstElement)
bus = &Bus{
C: CBus,
}
runtime.SetFinalizer(bus, func(bus *Bus) {
C.gst_object_unref(C.gpointer(unsafe.Pointer(bus.C)))
})
return
}
func (e *Element) SeekSimple(format FormatOptions, flags SeekFlags, seekPos time.Duration) bool {
Cbool := C.gst_element_seek_simple(e.GstElement, C.GstFormat(format), C.GstSeekFlags(flags), C.gint64(seekPos))
return Cbool == 1
}
func (e *Element) cleanCallback() {
if e.onPadAdded == nil {
return
}
mutex.Lock()
defer mutex.Unlock()
delete(callbackStore, e.callbackID)
}
//export go_callback_new_pad
func go_callback_new_pad(CgstElement *C.GstElement, CgstPad *C.GstPad, callbackID C.guint64) {
mutex.Lock()
element := callbackStore[uint64(callbackID)]
mutex.Unlock()
if element == nil {
return
}
callback := element.onPadAdded
pad := &Pad{
pad: CgstPad,
}
callback(element, pad)
}
func (e *Element) SetPadAddedCallback(callback PadAddedCallback) {
e.onPadAdded = callback
var callbackID uint64
mutex.Lock()
for {
callbackID = rand.Uint64()
if callbackStore[callbackID] != nil {
continue
}
callbackStore[callbackID] = e
break
}
mutex.Unlock()
e.callbackID = callbackID
detailedSignal := (*C.gchar)(C.CString("pad-added"))
defer C.free(unsafe.Pointer(detailedSignal))
runtime.SetFinalizer(e, func(e *Element) {
e.cleanCallback()
})
C.X_g_signal_connect(e.GstElement, detailedSignal, C.guint64(callbackID))
}
func ElementFactoryMake(factoryName string, name string) (e *Element, err error) {
var pName *C.gchar
pFactoryName := (*C.gchar)(unsafe.Pointer(C.CString(factoryName)))
defer C.g_free(C.gpointer(unsafe.Pointer(pFactoryName)))
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_element_factory_make(pFactoryName, pName)
if gstElt == nil {
err = errors.New(fmt.Sprintf("could not create a GStreamer element factoryName %s, name %s", factoryName, name))
return
}
e = &Element{
GstElement: gstElt,
}
return
}
func nonCopyGoBytes(ptr uintptr, length int) []byte {
var slice []byte
header := (*reflect.SliceHeader)(unsafe.Pointer(&slice))
header.Cap = length
header.Len = length
header.Data = ptr
return slice
}
func nonCopyCString(data *C.char, size C.int) []byte {
return nonCopyGoBytes(uintptr(unsafe.Pointer(data)), int(size))
}