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