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add support for the AVIF, HEIC and HEIF formats
These 3 formats have in common that they use the HEIF container format specified in ISO/IEC 23008-12. The MIME types and variant types (file extension) for HEIC and HEIF are based on sections C.2 and D.2 of the specification. A HEIF container can contain multiple images, so the logic is kept as in `:ico` (take the size of the largest image). The size of an image is found in the `ispe` box.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,22 @@ | ||
| defmodule ExImageInfo.Types.AVIF do | ||
| @moduledoc false | ||
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| @behaviour ExImageInfo.Detector | ||
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| @mime "image/avif" | ||
| @signature <<"ftypavif">> | ||
| @ftype "AVIF" | ||
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| ## Public API | ||
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| def seems?(<<_::size(32), @signature, _rest::binary>>), do: true | ||
| def seems?(_), do: false | ||
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| def info(<<_::size(32), @signature, rest::binary>>), | ||
| do: ExImageInfo.Types.HEIF.info(rest, @mime, @ftype) | ||
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| def info(_), do: nil | ||
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| def type(<<_::size(32), @signature, _rest::binary>>), do: {@mime, @ftype} | ||
| def type(_), do: nil | ||
| end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| defmodule ExImageInfo.Types.HEIC do | ||
| @moduledoc false | ||
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| @behaviour ExImageInfo.Detector | ||
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| @mime_heic "image/heic" | ||
| @mime_heic_sequence "image/heic-sequence" | ||
| @signature_heic <<"ftypheic">> | ||
| @signature_heim <<"ftypheim">> | ||
| @signature_heis <<"ftypheis">> | ||
| @signature_heix <<"ftypheix">> | ||
| @signature_hevc <<"ftyphevc">> | ||
| @signature_hevm <<"ftyphevm">> | ||
| @signature_hevs <<"ftyphevs">> | ||
| @signature_hevx <<"ftyphevx">> | ||
| @ftype_heic "HEIC" | ||
| @ftype_heic_sequence "HEICS" | ||
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| ## Public API | ||
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| def seems?(<<_::size(32), @signature_heic, _rest::binary>>), do: true | ||
| def seems?(<<_::size(32), @signature_heim, _rest::binary>>), do: true | ||
| def seems?(<<_::size(32), @signature_heis, _rest::binary>>), do: true | ||
| def seems?(<<_::size(32), @signature_heix, _rest::binary>>), do: true | ||
| def seems?(_), do: false | ||
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| def info(<<_::size(32), @signature_heic, rest::binary>>), | ||
| do: ExImageInfo.Types.HEIF.info(rest, @mime_heic, @ftype_heic) | ||
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| def info(<<_::size(32), @signature_heim, rest::binary>>), | ||
| do: ExImageInfo.Types.HEIF.info(rest, @mime_heic, @ftype_heic) | ||
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| def info(<<_::size(32), @signature_heis, rest::binary>>), | ||
| do: ExImageInfo.Types.HEIF.info(rest, @mime_heic, @ftype_heic) | ||
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| def info(<<_::size(32), @signature_heix, rest::binary>>), | ||
| do: ExImageInfo.Types.HEIF.info(rest, @mime_heic, @ftype_heic) | ||
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| def info(<<_::size(32), @signature_hevc, rest::binary>>), | ||
| do: ExImageInfo.Types.HEIF.info(rest, @mime_heic_sequence, @ftype_heic_sequence) | ||
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| def info(<<_::size(32), @signature_hevm, rest::binary>>), | ||
| do: ExImageInfo.Types.HEIF.info(rest, @mime_heic_sequence, @ftype_heic_sequence) | ||
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| def info(<<_::size(32), @signature_hevs, rest::binary>>), | ||
| do: ExImageInfo.Types.HEIF.info(rest, @mime_heic_sequence, @ftype_heic_sequence) | ||
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| def info(<<_::size(32), @signature_hevx, rest::binary>>), | ||
| do: ExImageInfo.Types.HEIF.info(rest, @mime_heic_sequence, @ftype_heic_sequence) | ||
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| def info(_), do: nil | ||
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| def type(<<_::size(32), @signature_heic, _rest::binary>>), | ||
| do: {@mime_heic, @ftype_heic} | ||
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| def type(<<_::size(32), @signature_heim, _rest::binary>>), | ||
| do: {@mime_heic, @ftype_heic} | ||
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| def type(<<_::size(32), @signature_heis, _rest::binary>>), | ||
| do: {@mime_heic, @ftype_heic} | ||
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| def type(<<_::size(32), @signature_heix, _rest::binary>>), | ||
| do: {@mime_heic, @ftype_heic} | ||
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| def type(<<_::size(32), @signature_hevc, _rest::binary>>), | ||
| do: {@mime_heic_sequence, @ftype_heic_sequence} | ||
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| def type(<<_::size(32), @signature_hevm, _rest::binary>>), | ||
| do: {@mime_heic_sequence, @ftype_heic_sequence} | ||
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| def type(<<_::size(32), @signature_hevs, _rest::binary>>), | ||
| do: {@mime_heic_sequence, @ftype_heic_sequence} | ||
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| def type(<<_::size(32), @signature_hevx, _rest::binary>>), | ||
| do: {@mime_heic_sequence, @ftype_heic_sequence} | ||
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| def type(_), do: nil | ||
| end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| defmodule ExImageInfo.Types.HEIF do | ||
| @moduledoc false | ||
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| @behaviour ExImageInfo.Detector | ||
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| @mime_heif "image/heif" | ||
| @mime_heif_sequence "image/heif-sequence" | ||
| @signature_mif1 <<"ftypmif1">> | ||
| @signature_msf1 <<"ftypmsf1">> | ||
| @ftype_heif "HEIF" | ||
| @ftype_heif_sequence "HEIFS" | ||
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| ## Public API | ||
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| def seems?(<<_::size(32), @signature_mif1, _rest::binary>>), do: true | ||
| def seems?(<<_::size(32), @signature_msf1, _rest::binary>>), do: true | ||
| def seems?(_), do: false | ||
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| def info(<<_::size(32), @signature_mif1, rest::binary>>) do | ||
| info(rest, @mime_heif, @ftype_heif) | ||
| end | ||
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| def info(<<_::size(32), @signature_msf1, rest::binary>>), | ||
| do: info(rest, @mime_heif_sequence, @ftype_heif_sequence) | ||
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| def info(_), do: nil | ||
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| def info(binary, mime, ftype) do | ||
| case size(binary) do | ||
| {w, h} -> {mime, w, h, ftype} | ||
| _ -> nil | ||
| end | ||
| end | ||
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| def type(<<_::size(32), @signature_mif1, _rest::binary>>), | ||
| do: {@mime_heif, @ftype_heif} | ||
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| def type(<<_::size(32), @signature_msf1, _rest::binary>>), | ||
| do: {@mime_heif_sequence, @ftype_heif_sequence} | ||
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| def type(_), do: nil | ||
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| defp size(binary) do | ||
| [_hd | ispe_boxes] = String.split(binary, "ispe") | ||
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| if length(ispe_boxes) > 0 do | ||
| {width, height} = | ||
| ispe_boxes | ||
| |> Enum.map(fn <<_::size(32), width::size(32), height::size(32), _rest::binary>> -> | ||
| {width, height} | ||
| end) | ||
| |> Enum.max_by(&elem(&1, 0)) | ||
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| {width, height} | ||
| else | ||
| nil | ||
| end | ||
| end | ||
| end |