85 lines
2.6 KiB
Go
85 lines
2.6 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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const (
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boxSizeLength uint32 = 4
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boxTypeLength uint32 = 4
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// BoxTypeFileType File Type Box
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BoxTypeFileType = "ftyp"
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// BoxTypeMediaData Media Data Box
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BoxTypeMediaData = "mdat"
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// BoxTypeMovie Movie Box
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BoxTypeMovie = "moov"
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// BoxTypeMovieHeader Movie Header Box
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BoxTypeMovieHeader = "mvhd"
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// BoxTypeTrack Track Box
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BoxTypeTrack = "trak"
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// BoxTypeTrackHeader Track Header Box
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BoxTypeTrackHeader = "tkhd"
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// BoxTypeMedia Media Box
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BoxTypeMedia = "mdia"
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// BoxTypeMediaHeader Media Header Box
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BoxTypeMediaHeader = "mdhd"
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// BoxTypeHandlerReference Handler Reference Box
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BoxTypeHandlerReference = "hdlr"
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// BoxTypeMediaInformation Media Information Box
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BoxTypeMediaInformation = "minf"
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// BoxTypeDataInformation Data Information Box
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BoxTypeDataInformation = "dinf"
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// BoxTypeMovieFragment Movie Fragment Box
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BoxTypeMovieFragment = "moof"
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// BoxTypeMovieFragmentHeader Movie Fragment Header Box
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BoxTypeMovieFragmentHeader = "mfhd"
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// BoxTypeTrackFragment Track Fragment Box
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BoxTypeTrackFragment = "traf"
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// BoxTypeTrackFragmentHeader Track Fragment Header
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BoxTypeTrackFragmentHeader = "tfhd"
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// BoxTypeTrackFragmentRun Track Fragment Run Box
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BoxTypeTrackFragmentRun = "trun"
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// BoxTypeVideoMediaHeader Video Media Header Box
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BoxTypeVideoMediaHeader = "vmhd"
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)
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// Box is an abstract box struct
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type Box struct {
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FilePosition uint64
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HeaderSize uint32
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}
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// FullBox is an abstract box type extending base box
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type FullBox struct {
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*Box
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Version uint8
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Flag []byte
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flagUInt32 uint32
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}
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// newFullBox parses based on 4 bytes data the version number (first byte) and the flags (bytes 2 - 4)
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func newFullBox(box *Box, data []byte) *FullBox {
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fullBox := &FullBox{Box: box, Version: data[0], Flag: data[1:4]}
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// build uint32 for flags (used for easier matching)
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flag4Bytes := append(make([]byte, 1), fullBox.Flag...)
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fullBox.flagUInt32 = binary.BigEndian.Uint32(flag4Bytes)
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// extend header size
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fullBox.HeaderSize = fullBox.HeaderSize + 4
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return fullBox
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}
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