119 lines
2.2 KiB
Go
119 lines
2.2 KiB
Go
package videofile
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import "errors"
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type Quality string
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const (
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P240 Quality = "240p"
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P360 Quality = "360p"
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P480 Quality = "480p"
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P720 Quality = "720p"
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P1080 Quality = "1080p"
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P1440 Quality = "1440p"
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P4k Quality = "4k"
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P8k Quality = "8k"
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Original Quality = "original"
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)
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// Qualities Purposefully removing Original from this list (since it require special treatments anyway)
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var Qualities = []Quality{P240, P360, P480, P720, P1080, P1440, P4k, P8k}
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func QualityFromString(str string) (Quality, error) {
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if str == string(Original) {
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return Original, nil
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}
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qualities := Qualities
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for _, quality := range qualities {
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if string(quality) == str {
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return quality, nil
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}
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}
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return Original, errors.New("invalid quality string")
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}
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// AverageBitrate
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// I'm not entirely sure about the values for bit rates. Double-checking would be nice.
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func (v Quality) AverageBitrate() uint32 {
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switch v {
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case P240:
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return 400_000
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case P360:
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return 800_000
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case P480:
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return 1_200_000
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case P720:
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return 2_400_000
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case P1080:
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return 4_800_000
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case P1440:
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return 9_600_000
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case P4k:
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return 16_000_000
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case P8k:
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return 28_000_000
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case Original:
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panic("Original quality must be handled specially")
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}
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panic("Invalid quality value")
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}
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func (v Quality) MaxBitrate() uint32 {
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switch v {
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case P240:
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return 700_000
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case P360:
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return 1_400_000
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case P480:
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return 2_100_000
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case P720:
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return 4_000_000
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case P1080:
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return 8_000_000
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case P1440:
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return 12_000_000
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case P4k:
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return 28_000_000
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case P8k:
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return 40_000_000
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case Original:
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panic("Original quality must be handled specially")
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}
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panic("Invalid quality value")
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}
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func (v Quality) Height() uint32 {
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switch v {
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case P240:
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return 240
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case P360:
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return 360
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case P480:
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return 480
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case P720:
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return 720
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case P1080:
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return 1080
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case P1440:
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return 1440
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case P4k:
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return 2160
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case P8k:
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return 4320
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case Original:
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panic("Original quality must be handled specially")
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}
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panic("Invalid quality value")
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}
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func GetQualityFromHeight(height uint32) Quality {
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qualities := Qualities
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for _, quality := range qualities {
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if quality.Height() >= height {
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return quality
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}
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}
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return P240
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}
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