60 lines
2 KiB
Go
60 lines
2 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 (
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"encoding/binary"
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)
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// MovieFragmentHeaderBox Movie Fragment Header Box struct
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//
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// 8.8.5 Movie Fragment Header Box
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// Box Type: ‘mfhd’
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// Container: Movie Fragment Box ('moof')
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// Mandatory: Yes
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// Quantity: Exactly one
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//
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// The movie fragment header contains a sequence number, as a safety check. The sequence number
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// usually starts at 1 and increases for each movie fragment in the file, in the order in which they occur.
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// This allows readers to verify integrity of the sequence in environments where undesired re‐ordering
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// might occur.
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type MovieFragmentHeaderBox struct {
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*FullBox
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// a number associated with this fragment
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SequenceNumber uint32
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}
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// BoxTypeMovieFragmentHeader Movie Fragment Header Box
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const BoxTypeMovieFragmentHeader = "mfhd"
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func init() {
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BoxDefinitions = append(BoxDefinitions, BoxDefinition{
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Type: BoxTypeMovieFragmentHeader,
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ParentTypes: []string{BoxTypeMovieFragment},
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Parser: ParseMovieFragmentHeaderBox,
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})
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}
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// ParseMovieFragmentHeaderBox creates a new Movie Fragment Header Box struct
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func ParseMovieFragmentHeaderBox(parser *Parser, filePosition uint64, headerSize uint32, content []byte) (any, error) {
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box := &MovieFragmentHeaderBox{
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FullBox: newFullBox(&Box{filePosition, headerSize}, content[0:4]),
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}
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// parse sequence number
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box.SequenceNumber = binary.BigEndian.Uint32(content[4:8])
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return box, nil
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}
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