photoprism/pkg/video/brands.go

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package video
import (
"errors"
"os"
"github.com/photoprism/photoprism/pkg/fs"
)
// ChunkFTYP specifies the start chunk of the ISO base media
// format, it must be followed by a valid subtype chunk.
// https://en.wikipedia.org/wiki/ISO_base_media_file_format
var (
ChunkFTYP = Chunk{'f', 't', 'y', 'p'}
ChunkQT = Chunk{'q', 't', ' ', ' '}
ChunkISOM = Chunk{'i', 's', 'o', 'm'}
ChunkISO2 = Chunk{'i', 's', 'o', '2'}
ChunkISO3 = Chunk{'i', 's', 'o', '3'}
ChunkISO4 = Chunk{'i', 's', 'o', '4'}
ChunkISO5 = Chunk{'i', 's', 'o', '5'}
ChunkISO6 = Chunk{'i', 's', 'o', '6'}
ChunkISO7 = Chunk{'i', 's', 'o', '7'}
ChunkISO8 = Chunk{'i', 's', 'o', '8'}
ChunkISO9 = Chunk{'i', 's', 'o', '9'}
ChunkAVC1 = Chunk{'a', 'v', 'c', '1'}
ChunkHEV1 = Chunk{'h', 'e', 'v', '1'}
ChunkHVC1 = Chunk{'h', 'v', 'c', '1'}
ChunkAV01 = Chunk{'a', 'v', '0', '1'}
ChunkAV1C = Chunk{'a', 'v', '1', 'C'}
ChunkMMP4 = Chunk{'m', 'm', 'p', '4'}
ChunkMP4V = Chunk{'m', 'p', '4', 'v'}
ChunkMP41 = Chunk{'m', 'p', '4', '1'}
ChunkMP42 = Chunk{'m', 'p', '4', '2'}
ChunkMP71 = Chunk{'m', 'p', '7', '1'}
ChunkHEIC = Chunk{'h', 'e', 'i', 'c'}
)
// CompatibleBrands contains compatible subtypes chunks.
var CompatibleBrands = Chunks{
ChunkQT,
ChunkISOM,
ChunkISO2,
ChunkISO3,
ChunkISO4,
ChunkISO5,
ChunkISO6,
ChunkISO7,
ChunkISO8,
ChunkISO9,
ChunkAVC1,
ChunkHEV1,
ChunkHVC1,
ChunkAV01,
ChunkAV1C,
ChunkMMP4,
ChunkMP4V,
ChunkMP41,
ChunkMP42,
ChunkMP71,
}
// FileTypeOffset returns the file type start offset, or -1 if it was not found.
func FileTypeOffset(fileName string, brands Chunks) (int, error) {
if !fs.FileExists(fileName) {
return -1, errors.New("file not found")
}
file, err := os.Open(fileName)
if err != nil {
return -1, err
}
defer file.Close()
index, err := brands.FileTypeOffset(file)
return index, err
}