new video media header box

Box.go

@@ -50,6 +50,8 @@ const (
 	BoxTypeTrackFragmentHeader = "tfhd"
 	// BoxTypeTrackFragmentRun  Track Fragment Run Box
 	BoxTypeTrackFragmentRun = "trun"
+	// BoxTypeVideoMediaHeader Video Media Header Box
+	BoxTypeVideoMediaHeader = "vmhd"
 )
 
 // Box is an abstract box struct

Parser.go

@@ -134,6 +134,8 @@ func parseNextBox(reader io.Reader, filePosition uint64) (box interface{}, endPo
 		box = ParseTrackFragmentHeaderBox(filePosition, boxHeaderSize, boxContentBytes)
 	case BoxTypeTrackFragmentRun:
 		box, err = ParseTrackFragmentRunBox(filePosition, boxHeaderSize, boxContentBytes)
+	case BoxTypeVideoMediaHeader:
+		box = ParseVideoMediaHeaderBox(filePosition, boxHeaderSize, boxContentBytes)
 	default:
 		logger.Println("unknown box type", boxType, "at", filePosition)
 		return nil, filePosition, false, errors.New("unknown box type " + boxType)

README.md

@@ -106,6 +106,14 @@ Implementation progress
 | 8.16.5 Producer Reference Time Box                 | prft           |      - |
 | 8.17.3 Complete Track Information Box              | cinf           |      - |
 | 9.1.2.1 SRTP Process box                           | srpp           |      - |
+| 9.2.4.7 FEC Information Box                        | feci           |      - |
+| 12.1.2 Video media header                          | vmhd           |   100% |
+| 12.2.1 Media handler                               | soun           |      - |
+| 12.2.2 Sound media header                          | smhd           |      - |
+| 12.2.4 Channel layout                              | chnl           |      - |
+| 12.2.5 Downmix Instructions                        | dmix           |      - |
+| 12.2.7 Audio stream loudness                       | ludt           |      - |
+| 12.4.2 Hint Media Header Box                       | hmhd           |      - |
 
 ## Helper Tools
 

VideoMediaHeaderBox.go

@@ -0,0 +1,53 @@
+// Copyright 2024 Martin Riedl
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package gomp4
+
+import "encoding/binary"
+
+// VideoMediaHeaderBox video media header box struct
+//
+// 12.1.2 Video media header
+//
+// Box Types: ‘vmhd’
+// Container: Media Information Box (‘minf’)
+// Mandatory: Yes
+// Quantity: Exactly one
+// Video tracks use the VideoMediaHeaderbox in the media information box as defined in 8.4.5. The video
+// media header contains general presentation information, independent of the coding, for video media.
+// Note that the flags field has the value 1.
+type VideoMediaHeaderBox struct {
+	*FullBox
+	// specifies a composition mode for this video track, from the following enumerated
+	// set, which may be extended by derived specifications:
+	// copy = 0 copy over the existing image
+	GraphicsMode uint16
+	// is a set of 3 colour values (red, green, blue) available for use by graphics modes
+	CPColor []uint16
+}
+
+// ParseVideoMediaHeaderBox creates a new Video Media Header Box struct
+func ParseVideoMediaHeaderBox(filePosition uint64, headerSize uint32, content []byte) *VideoMediaHeaderBox {
+	box := &VideoMediaHeaderBox{
+		FullBox: newFullBox(&Box{filePosition, headerSize}, content[0:4]),
+	}
+
+	position := 4
+	box.GraphicsMode = binary.BigEndian.Uint16(content[position : position+2])
+	box.CPColor = append(box.CPColor, binary.BigEndian.Uint16(content[position+2:position+4]))
+	box.CPColor = append(box.CPColor, binary.BigEndian.Uint16(content[position+4:position+6]))
+	box.CPColor = append(box.CPColor, binary.BigEndian.Uint16(content[position+6:position+8]))
+
+	return box
+}