53 lines
2.3 KiB
Go
53 lines
2.3 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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// SampleTableBox sample table box struct
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//
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// 8.5.1 Sample Table Box
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//
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// Box Type: ‘stbl’
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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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//
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// The sample table contains all the time and data indexing of the media samples in a track. Using the
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// tables here, it is possible to locate samples in time, determine their type (e.g. I‐frame or not), and
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// determine their size, container, and offset into that container.
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//
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// If the track that contains the Sample Table Box references no data, then the Sample Table Box does not
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// need to contain any sub‐boxes (this is not a very useful media track).
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//
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// If the track that the Sample Table Box is contained in does reference data, then the following sub‐boxes
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// are required: Sample Description, Sample Size, Sample To Chunk, and Chunk Offset. Further, the Sample
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// Description Box shall contain at least one entry. A Sample Description Box is required because it
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// contains the data reference index field which indicates which Data Reference Box to use to retrieve the
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// media samples. Without the Sample Description, it is not possible to determine where the media
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// samples are stored. The Sync Sample Box is optional. If the Sync Sample Box is not present, all samples
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// are sync samples.
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type SampleTableBox struct {
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*Box
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ChildBoxes []interface{}
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}
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// ParseSampleTableBox creates a new sample table box struct based on bytes
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func ParseSampleTableBox(filePosition uint64, headerSize uint32, content []byte) (*SampleTableBox, error) {
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box := &SampleTableBox{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(filePosition, content)
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return box, err
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}
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