feat: add pasp

container/mp4/box/box_type.go

@@ -75,6 +75,7 @@ const (
 	TypeBtrt = "btrt"
 	TypeMp4a = "mp4a"
 	TypeEsds = "esds"
+	TypePasp = "pasp"
 )
 
 var boxTypes = map[string]BasicInfo{
@@ -137,6 +138,7 @@ var boxTypes = map[string]BasicInfo{
 	TypeBtrt: {Name: "MPEG4 Bit Rate Box"},
 	TypeMp4a: {Name: "MP4 Visual Sample Entry"},
 	TypeEsds: {Name: "ES Descriptor Box"},
+	TypePasp: {Name: "Pixel Aspect Ratio Box"},
 }
 
 // BoxTypes returns box types map.

container/mp4/box/sampleentry/av01/av01_sample_entry.go

@@ -9,6 +9,7 @@ import (
 	"github.com/wangyoucao577/medialib/container/mp4/box/sampleentry"
 	av1c "github.com/wangyoucao577/medialib/container/mp4/box/sampleentry/av1C"
 	"github.com/wangyoucao577/medialib/container/mp4/box/sampleentry/btrt"
+	"github.com/wangyoucao577/medialib/container/mp4/box/sampleentry/pasp"
 	"github.com/wangyoucao577/medialib/container/mp4/box/sampleentry/vide"
 )
 
@@ -18,6 +19,7 @@ type AV1SampleEntry struct {
 
 	AV1Config *av1c.AV1ConfigrationBox `json:"av1C"`
 	Btrt      *btrt.Box                `json:"btrt,omitempty"`
+	Pasp      *pasp.Box                `json:"pasp,omitempty"`
 
 	boxesCreator map[string]box.NewFunc `json:"-"`
 }
@@ -34,6 +36,7 @@ func New(h box.Header) box.Box {
 		boxesCreator: map[string]box.NewFunc{
 			box.TypeAv1C: av1c.New,
 			box.TypeBtrt: btrt.New,
+			box.TypePasp: pasp.New,
 		},
 	}
 }
@@ -56,6 +59,8 @@ func (a *AV1SampleEntry) CreateSubBox(h box.Header) (box.Box, error) {
 		a.AV1Config = createdBox.(*av1c.AV1ConfigrationBox)
 	case box.TypeBtrt:
 		a.Btrt = createdBox.(*btrt.Box)
+	case box.TypePasp:
+		a.Pasp = createdBox.(*pasp.Box)
 	}
 
 	return createdBox, nil

container/mp4/box/sampleentry/pasp/pasp_box.go

@@ -0,0 +1,48 @@
+// Package pasp represents PixelAspectRatio Box.
+package pasp
+
+import (
+	"encoding/binary"
+	"io"
+
+	"github.com/golang/glog"
+	"github.com/wangyoucao577/medialib/container/mp4/box"
+	"github.com/wangyoucao577/medialib/util"
+)
+
+// Box represents a PixelAspectRatio box.
+type Box struct {
+	box.Header `json:"header"`
+
+	HSpacing uint32 `json:"hSpacing"`
+	VSpacing uint32 `json:"vSpacing"`
+}
+
+// New creates a new Box.
+func New(h box.Header) box.Box {
+	return &Box{
+		Header: h,
+	}
+}
+
+// ParsePayload parse payload which requires basic box already exist.
+func (b *Box) ParsePayload(r io.Reader) error {
+	if err := b.Validate(); err != nil {
+		glog.Warningf("box %s invalid, err %v", b.Header.Type, err)
+		return nil
+	}
+
+	// start to parse payload
+	var parsedBytes uint64
+
+	data := make([]byte, 8)
+	if err := util.ReadOrError(r, data); err != nil {
+		return err
+	} else {
+		b.HSpacing = binary.BigEndian.Uint32(data[:4])
+		b.VSpacing = binary.BigEndian.Uint32(data[4:])
+		parsedBytes += 8
+	}
+
+	return nil
+}