55 lines
2 KiB
Go
55 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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// TrackFragmentBox Track Fragment Box struct
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//
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// 8.8.6 Track Fragment Box
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// Box Type: ‘traf’
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// Container: Movie Fragment Box ('moof')
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// Mandatory: No
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// Quantity: Zero or more
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//
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// Within the movie fragment there is a set of track fragments, zero or more per track. The track fragments
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// in turn contain zero or more track runs, each of which document a contiguous run of samples for that
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// track. Within these structures, many fields are optional and can be defaulted.
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//
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// It is possible to add 'empty time' to a track using these structures, as well as adding samples. Empty
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// inserts can be used in audio tracks doing silence suppression, for example.
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type TrackFragmentBox struct {
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*Box
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ChildBoxes []any
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}
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// BoxTypeTrackFragment Track Fragment Box
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const BoxTypeTrackFragment = "traf"
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func init() {
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BoxDefinitions = append(BoxDefinitions, BoxDefinition{
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Type: BoxTypeTrackFragment,
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ParentTypes: []string{BoxTypeMovieFragment},
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Parser: ParseTrackFragmentBox,
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})
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}
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// ParseTrackFragmentBox creates a new Track Fragment Box struct
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func ParseTrackFragmentBox(parser *Parser, filePosition uint64, headerSize uint32, content []byte) (any, error) {
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box := &TrackFragmentBox{Box: &Box{filePosition, headerSize}}
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// parse child boxes
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var err error
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box.ChildBoxes, err = box.parseChildBoxes(parser, BoxTypeTrackFragment, filePosition, content)
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return box, err
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}
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