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mediainfo_cgo.go
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mediainfo_cgo.go
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package mediainfo
// #cgo CFLAGS: -DUNICODE -D_UNICODE
// #include "mediainfo.h"
// #cgo linux LDFLAGS: -ldl
import "C"
import (
"encoding/json"
"fmt"
"unsafe"
)
type streamType uint
const (
streamGeneral streamType = iota
streamVideo
streamAudio
streamText
streamOther
streamImage
streamMenu
streamMax
)
var loaded bool
func init() {
C.GoSetLocale()
}
var (
inform = wideString("Inform")
jsonStr = wideString("JSON")
)
// MediaInfo - represents MediaInfo class, all interaction with libmediainfo through it
type mediaInfo struct {
handle unsafe.Pointer
}
// Load loads the DLL/shared object. If successful returns true.
func Load() bool {
r := C.MediaInfoDLL_Load()
if r == 1 {
loaded = true
return true
}
return false
}
// Unload unloads the DLL/shared object
func Unload() {
C.MediaInfoDLL_UnLoad()
}
// newMediaInfo - constructs new MediaInfo
func newMediaInfo() (*mediaInfo, error) {
if !loaded {
return nil, ErrNotLoaded
}
result := &mediaInfo{handle: C.GoMediaInfo_New()}
return result, nil
}
// OpenFile - opens file
func (mi *mediaInfo) OpenFile(path string) error {
p := wideString(path)
s := C.GoMediaInfo_OpenFile(mi.handle, (*C.wchar_t)(unsafe.Pointer(&p[0])))
if s == 0 {
return fmt.Errorf("MediaInfo can't open file: %s", path)
}
return nil
}
// Close - closes file
func (mi *mediaInfo) Close() {
C.GoMediaInfo_Close(mi.handle)
}
func (mi *mediaInfo) Inform() (informStruct, error) {
C.GoMediaInfoOption(mi.handle, (*C.wchar_t)(unsafe.Pointer(&inform[0])), (*C.wchar_t)(unsafe.Pointer(&jsonStr[0])))
str := toString(C.GoMediaInfoInform(mi.handle))
info := informStruct{}
err := json.Unmarshal([]byte(str), &info)
return info, err
}