Dmitry Sergeev
121 lines
2.7 KiB
Go
121 lines
2.7 KiB
Go
// MXL Flow Definition helper
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package flowdef
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import (
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"encoding/json"
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"errors"
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"os"
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)
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const (
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TYPE_VIDEO = iota
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TYPE_VIDEO_ALPHA
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TYPE_AUDIO
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)
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var (
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ErrUnknownFlowType = errors.New("Unknown flow type provided")
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ErrIncorrectFlowUUID = errors.New("Incorrect flow uuid")
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)
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type flowDef struct {
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Description string `json:"description"`
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Id string `json:"id"`
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Tags map[string][]string `json:"tags"`
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Format string `json:"format"`
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Label string `json:"label"`
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Parents []string `json:"parents"`
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MediaType string `json:"media_type"`
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GrainRate grainRate `json:"grain_rate"`
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FrameWidth uint `json:"frame_width"`
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FrameHeight uint `json:"frame_height"`
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InterlaceMode string `json:"interlace_mode"`
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ColorSpace string `json:"colorspace"`
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Components [3]videoComponent `json:"components"`
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}
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type grainRate struct {
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Numerator uint `json:"numerator"`
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Denominator uint `json:"denominator"`
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}
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type videoComponent struct {
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Name string `json:"name"`
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Width uint `json:"width"`
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Height uint `json:"height"`
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BitDepth uint `json:"bit_depth"`
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}
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func NewFlowDefJSON(
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feedType int,
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uuid string,
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width uint,
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height uint,
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fpsNum uint,
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fpsDen uint,
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) (string, error) {
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if feedType != TYPE_VIDEO &&
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feedType != TYPE_VIDEO_ALPHA &&
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feedType != TYPE_AUDIO {
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return "", ErrUnknownFlowType
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}
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if uuid == "" {
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return "", ErrIncorrectFlowUUID
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}
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tags := map[string][]string{
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"urn:x-nmos:tag:grouphint/v1.0": {
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"___one day I will follow NMOS specs___:Video",
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},
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}
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flowDef := flowDef{
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Description: "go-mxl-pattern-gen generated feed",
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Id: uuid,
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Tags: tags,
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Format: "urn:x-nmos:format:video",
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Label: "go-mxl-pattern-gen generated feed",
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Parents: nil,
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MediaType: "video/v210",
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GrainRate: grainRate{
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Numerator: fpsNum,
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Denominator: fpsDen,
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},
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FrameWidth: width,
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FrameHeight: height,
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InterlaceMode: "progressive",
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ColorSpace: "BT709",
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Components: [3]videoComponent{
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videoComponent{
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Name: "Y",
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Width: width,
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Height: height,
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BitDepth: 10,
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},
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videoComponent{
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Name: "Cb",
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Width: width / 2,
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Height: height,
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BitDepth: 10,
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},
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videoComponent{
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Name: "Cr",
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Width: width / 2,
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Height: height,
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BitDepth: 10,
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},
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},
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}
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jsonBytes, err := json.Marshal(flowDef)
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if err != nil {
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return "", err
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}
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return string(jsonBytes), nil
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}
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func ReadFlowDefFile(path string) (string, error) {
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data, err := os.ReadFile(path)
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if err != nil {
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return "", err
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}
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return string(data), nil
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}
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