93 lines
2.9 KiB
Go
93 lines
2.9 KiB
Go
// Copyright 2024 Martin Riedl
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package gomp4
|
|
|
|
import "encoding/binary"
|
|
|
|
const (
|
|
boxSizeLength uint32 = 4
|
|
boxTypeLength uint32 = 4
|
|
|
|
// BoxTypeFileType File Type Box
|
|
BoxTypeFileType = "ftyp"
|
|
// BoxTypeMediaData Media Data Box
|
|
BoxTypeMediaData = "mdat"
|
|
// BoxTypeMovie Movie Box
|
|
BoxTypeMovie = "moov"
|
|
// BoxTypeMovieHeader Movie Header Box
|
|
BoxTypeMovieHeader = "mvhd"
|
|
// BoxTypeTrack Track Box
|
|
BoxTypeTrack = "trak"
|
|
// BoxTypeTrackHeader Track Header Box
|
|
BoxTypeTrackHeader = "tkhd"
|
|
// BoxTypeMedia Media Box
|
|
BoxTypeMedia = "mdia"
|
|
// BoxTypeMediaHeader Media Header Box
|
|
BoxTypeMediaHeader = "mdhd"
|
|
// BoxTypeHandlerReference Handler Reference Box
|
|
BoxTypeHandlerReference = "hdlr"
|
|
// BoxTypeMediaInformation Media Information Box
|
|
BoxTypeMediaInformation = "minf"
|
|
// BoxTypeSampleTable Sample Table Box
|
|
BoxTypeSampleTable = "stbl"
|
|
// BoxTypeDataInformation Data Information Box
|
|
BoxTypeDataInformation = "dinf"
|
|
// BoxTypeDataReferenceBox Data Reference Box
|
|
BoxTypeDataReferenceBox = "dref"
|
|
// BoxTypeDataEntryUrlBox Data Entry URL Box
|
|
BoxTypeDataEntryUrlBox = "url "
|
|
// BoxTypeDataEntryUrnBox Data Entry URN Box
|
|
BoxTypeDataEntryUrnBox = "urn "
|
|
// BoxTypeMovieFragment Movie Fragment Box
|
|
BoxTypeMovieFragment = "moof"
|
|
// BoxTypeMovieFragmentHeader Movie Fragment Header Box
|
|
BoxTypeMovieFragmentHeader = "mfhd"
|
|
// BoxTypeTrackFragment Track Fragment Box
|
|
BoxTypeTrackFragment = "traf"
|
|
// BoxTypeTrackFragmentHeader Track Fragment Header
|
|
BoxTypeTrackFragmentHeader = "tfhd"
|
|
// BoxTypeTrackFragmentRun Track Fragment Run Box
|
|
BoxTypeTrackFragmentRun = "trun"
|
|
// BoxTypeVideoMediaHeader Video Media Header Box
|
|
BoxTypeVideoMediaHeader = "vmhd"
|
|
)
|
|
|
|
// Box is an abstract box struct
|
|
type Box struct {
|
|
FilePosition uint64
|
|
HeaderSize uint32
|
|
}
|
|
|
|
// FullBox is an abstract box type extending base box
|
|
type FullBox struct {
|
|
*Box
|
|
Version uint8
|
|
Flag []byte
|
|
flagUInt32 uint32
|
|
}
|
|
|
|
// newFullBox parses based on 4 bytes data the version number (first byte) and the flags (bytes 2 - 4)
|
|
func newFullBox(box *Box, data []byte) *FullBox {
|
|
fullBox := &FullBox{Box: box, Version: data[0], Flag: data[1:4]}
|
|
|
|
// build uint32 for flags (used for easier matching)
|
|
flag4Bytes := append(make([]byte, 1), fullBox.Flag...)
|
|
fullBox.flagUInt32 = binary.BigEndian.Uint32(flag4Bytes)
|
|
|
|
// extend header size
|
|
fullBox.HeaderSize = fullBox.HeaderSize + 4
|
|
|
|
return fullBox
|
|
}
|