35 lines
962 B
Go
35 lines
962 B
Go
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package media
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import (
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"sort"
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"strings"
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youtubev2 "github.com/kkdai/youtube/v2"
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)
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// sortAudio returns the provided formats ordered in descending preferred
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// order. The ideal candidate is opus-encoded stereo audio in a webm container,
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// with the lowest available bitrate.
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func sortAudio(inFormats youtubev2.FormatList) youtubev2.FormatList {
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var formats youtubev2.FormatList
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for _, format := range inFormats {
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if format.FPS == 0 && format.AudioChannels > 0 {
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formats = append(formats, format)
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}
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}
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sort.SliceStable(formats, func(i, j int) bool {
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isOpusI := strings.Contains(formats[i].MimeType, "opus")
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isOpusJ := strings.Contains(formats[j].MimeType, "opus")
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if isOpusI && isOpusJ {
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isStereoI := formats[i].AudioChannels == 2
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isStereoJ := formats[j].AudioChannels == 2
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if isStereoI && isStereoJ {
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return formats[i].ContentLength < formats[j].ContentLength
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}
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return isStereoI
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}
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return isOpusI
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})
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return formats
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}
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