clipper/backend/media/media_set.go

package media

import (
	"fmt"
	"time"

	"github.com/google/uuid"
)

const SizeOfInt16 = 2

type Audio struct {
	Bytes    int64 `json:"bytes"`
	Channels int   `json:"channels"`
	// ApproxFrames is used during initial processing when a precise frame count
	// cannot be determined. Prefer Frames in all other cases.
	ApproxFrames int64  `json:"approx_frames"`
	Frames       int64  `json:"frames"`
	SampleRate   int    `json:"sample_rate"`
	YoutubeItag  int    `json:"youtube_itag"`
	MimeType     string `json:"mime_type"`
}

type Video struct {
	Bytes    int64         `json:"bytes"`
	Duration time.Duration `json:"duration"`
	// not sure if this are needed any more?
	ThumbnailWidth  int    `json:"thumbnail_width"`
	ThumbnailHeight int    `json:"thumbnail_height"`
	YoutubeItag     int    `json:"youtube_itag"`
	MimeType        string `json:"mime_type"`
}

// MediaSet represents the media and metadata associated with a single media
// resource (for example, a YouTube video).
type MediaSet struct {
	Audio     Audio     `json:"audio"`
	Video     Video     `json:"video"`
	ID        uuid.UUID `json:"id"`
	YoutubeID string    `json:"youtube_id"`

	exists bool
}

// New builds a new MediaSet with the given ID.
func NewMediaSet(youtubeID string) *MediaSet {
	return &MediaSet{YoutubeID: youtubeID}
}

// TODO: pass io.Readers/Writers instead of strings.
func (m *MediaSet) RawAudioPath() string     { return fmt.Sprintf("cache/%s.raw", m.YoutubeID) }
func (m *MediaSet) EncodedAudioPath() string { return fmt.Sprintf("cache/%s.m4a", m.YoutubeID) }
func (m *MediaSet) VideoPath() string        { return fmt.Sprintf("cache/%s.mp4", m.YoutubeID) }
func (m *MediaSet) ThumbnailPath() string    { return fmt.Sprintf("cache/%s.jpg", m.YoutubeID) }
func (m *MediaSet) MetadataPath() string     { return fmt.Sprintf("cache/%s.json", m.YoutubeID) }