clipper/backend/youtube/helpers.go

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package youtube
import (
"fmt"
"sort"
"strings"
youtubev2 "github.com/kkdai/youtube/v2"
)
func FormatDebugString(format *youtubev2.Format, includeURL bool) string {
var url string
if includeURL {
url = format.URL
}
return fmt.Sprintf(
"iTag = %d, mime_type = %s, quality = %s, quality_label = %s, bitrate = %d, fps = %d, width = %d, height = %d, content_length = %d, duration = %v, audio_channels = %d, audio_sample_rate = %s, audio_quality = %s, url = %s",
format.ItagNo,
format.MimeType,
format.Quality,
format.QualityLabel,
format.Bitrate,
format.FPS,
format.Width,
format.Height,
format.ContentLength,
format.ApproxDurationMs,
format.AudioChannels,
format.AudioSampleRate,
format.AudioQuality,
url,
)
}
// SortAudio returns the provided formats ordered in descending preferred
// order. The ideal candidate is 44.1kHz stereo audio in a webm container, with
// the highest available bitrate.
func SortAudio(inFormats youtubev2.FormatList) youtubev2.FormatList {
// TODO: sort in-place.
var formats youtubev2.FormatList
for _, format := range inFormats {
if format.FPS == 0 && format.AudioChannels > 0 {
formats = append(formats, format)
}
}
sort.SliceStable(formats, func(i, j int) bool {
isOpusI := strings.Contains(formats[i].MimeType, "opus")
isOpusJ := strings.Contains(formats[j].MimeType, "opus")
if isOpusI && isOpusJ {
isStereoI := formats[i].AudioChannels == 2
isStereoJ := formats[j].AudioChannels == 2
if isStereoI && isStereoJ {
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is48kI := formats[i].AudioSampleRate == "48000"
is48kJ := formats[j].AudioSampleRate == "48000"
if is48kI && is48kJ {
return formats[i].Bitrate > formats[j].Bitrate
}
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return is48kI
}
return isStereoI
}
return isOpusI
})
return formats
}
// SortVideo returns the provided formats ordered in descending preferred
// order. The ideal candidate is video in an mp4 container with a medium
// bitrate, with audio channels (needed to allow synced playback on the
// website).
func SortVideo(inFormats youtubev2.FormatList) youtubev2.FormatList {
// TODO: sort in-place.
var formats youtubev2.FormatList
for _, format := range inFormats {
if format.FPS > 0 && format.AudioChannels > 0 {
formats = append(formats, format)
}
}
sort.SliceStable(formats, func(i, j int) bool {
isMP4I := strings.Contains(formats[i].MimeType, "mp4")
isMP4J := strings.Contains(formats[j].MimeType, "mp4")
if isMP4I && isMP4J {
return compareQualityLabel(formats[i].QualityLabel, formats[j].QualityLabel)
}
return strings.Contains(formats[i].MimeType, "mp4")
})
return formats
}
func compareQualityLabel(a, b string) bool {
return (a == "360p" || a == "480p") && (b != "360p" && b != "480p")
}