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