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2fc0a71a47
Move scalar into own package. Split scalar code into decode related scalar code (that reads etc) and scalar code that just transform the scalar value. Use a scalar.Mapper interface instead of just a function. Make mappers, assert and validat impement the interface.
66 lines
1.6 KiB
Go
66 lines
1.6 KiB
Go
package flac
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import (
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"github.com/wader/fq/format"
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"github.com/wader/fq/format/registry"
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"github.com/wader/fq/pkg/decode"
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"github.com/wader/fq/pkg/scalar"
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)
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var images decode.Group
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var pictureTypeNames = scalar.UToSymStr{
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0: "Other",
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1: "32x32 pixels 'file icon' (PNG only)",
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2: "Other file icon",
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3: "Cover (front)",
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4: "Cover (back)",
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5: "Leaflet page",
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6: "Media (e.g. label side of CD)",
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7: "Lead artist/lead performer/soloist",
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8: "Artist/performer",
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9: "Conductor",
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10: "Band/Orchestra",
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11: "Composer",
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12: "Lyricist/text writer",
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13: "Recording Location",
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14: "During recording",
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15: "During performance",
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16: "Movie/video screen capture",
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17: "A bright colored fish",
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18: "Illustration",
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19: "Band/artist logotype",
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20: "Publisher/Studio logotype",
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}
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func init() {
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registry.MustRegister(decode.Format{
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Name: format.FLAC_PICTURE,
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Description: "FLAC metadatablock picture",
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DecodeFn: pictureDecode,
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Dependencies: []decode.Dependency{
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{Names: []string{format.IMAGE}, Group: &images},
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},
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})
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}
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func pictureDecode(d *decode.D, in interface{}) interface{} {
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lenStr := func(name string) string { //nolint:unparam
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l := d.FieldU32(name + "_length")
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return d.FieldUTF8(name, int(l))
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}
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d.FieldU32("picture_type", pictureTypeNames)
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lenStr("mime")
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lenStr("description")
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d.FieldU32("width")
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d.FieldU32("height")
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d.FieldU32("color_depth")
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d.FieldU32("number_of_index_colors")
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pictureLen := d.FieldU32("picture_length")
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if dv, _, _ := d.TryFieldFormatLen("picture_data", int64(pictureLen)*8, images, nil); dv == nil {
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d.FieldRawLen("picture_data", int64(pictureLen)*8)
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}
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return nil
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}
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