func NewMuxer(source *MediaSource, format, uri string) (*Muxer, error) {
m := Muxer{done: make(chan bool), recl: make([]reclaimer, 0, 8)}
m.context = C.avformat_alloc_context()
if m.context == (*C.AVFormatContext)(null) {
return nil, fmt.Errorf("allocate output format context failed")
}
m.recl = append(m.recl, func() {
C.avformat_free_context(m.context)
})
var f *C.char = C.CString(format)
var u *C.char = C.CString(uri)
defer C.free(unsafe.Pointer(f))
defer C.free(unsafe.Pointer(u))
m.context.oformat = C.av_guess_format(f, u, (*C.char)(null))
if m.context.oformat == (*C.AVOutputFormat)(null) {
return nil, fmt.Errorf("output format not supported")
}
C.av_strlcpy(&m.context.filename[0], u, C.size_t(unsafe.Sizeof(m.context.filename)))
var err error
if m.capture, err = NewCapture(source.Video.driver, source.Video.device); err != nil {
return nil, err
}
return &m, nil
}
func (ctx *Context) SetFileName(fileName string) {
cFileName := C.CString(fileName)
defer C.free(unsafe.Pointer(cFileName))
C.av_strlcpy(&ctx.CAVFormatContext.filename[0], cFileName, C.sizeOfAVFormatContextFilename)
}