clipper/backend/media/service.go

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package media
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import (
"bytes"
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"context"
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"database/sql"
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"encoding/binary"
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"errors"
"fmt"
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"io"
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"log"
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"strconv"
"time"
"git.netflux.io/rob/clipper/generated/store"
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"github.com/aws/aws-sdk-go-v2/aws"
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"github.com/aws/aws-sdk-go-v2/service/s3"
"github.com/google/uuid"
youtubev2 "github.com/kkdai/youtube/v2"
)
const s3Bucket = "clipper-development"
const (
rawAudioCodec = "pcm_s16le"
rawAudioFormat = "s16le"
rawAudioSampleRate = 48_000
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rawAudioMimeType = "audio/raw"
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)
const (
thumbnailWidth = 177 // 16:9
thumbnailHeight = 100 // "
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)
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// progressReader is a reader that prints progress logs as it reads.
type progressReader struct {
io.Reader
label string
total, exp int
}
func (pw *progressReader) Read(p []byte) (int, error) {
n, err := pw.Reader.Read(p)
pw.total += n
log.Printf("[ProgressReader] [%s] Read %d of %d (%.02f%%) bytes from the provided reader", pw.label, pw.total, pw.exp, (float32(pw.total)/float32(pw.exp))*100.0)
return n, err
}
// Store wraps a database store.
type Store interface {
GetMediaSet(ctx context.Context, id uuid.UUID) (store.MediaSet, error)
GetMediaSetByYoutubeID(ctx context.Context, youtubeID string) (store.MediaSet, error)
CreateMediaSet(ctx context.Context, arg store.CreateMediaSetParams) (store.MediaSet, error)
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SetAudioUploaded(ctx context.Context, arg store.SetAudioUploadedParams) (store.MediaSet, error)
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}
// S3Client wraps the AWS S3 service client.
type S3Client interface {
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GetObject(context.Context, *s3.GetObjectInput, ...func(*s3.Options)) (*s3.GetObjectOutput, error)
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CreateMultipartUpload(context.Context, *s3.CreateMultipartUploadInput, ...func(*s3.Options)) (*s3.CreateMultipartUploadOutput, error)
UploadPart(context.Context, *s3.UploadPartInput, ...func(*s3.Options)) (*s3.UploadPartOutput, error)
AbortMultipartUpload(ctx context.Context, params *s3.AbortMultipartUploadInput, optFns ...func(*s3.Options)) (*s3.AbortMultipartUploadOutput, error)
CompleteMultipartUpload(context.Context, *s3.CompleteMultipartUploadInput, ...func(*s3.Options)) (*s3.CompleteMultipartUploadOutput, error)
}
// YoutubeClient wraps the youtube.Client client.
type YoutubeClient interface {
GetVideoContext(context.Context, string) (*youtubev2.Video, error)
GetStreamContext(context.Context, *youtubev2.Video, *youtubev2.Format) (io.ReadCloser, int64, error)
}
// MediaSetService exposes logical flows handling MediaSets.
type MediaSetService struct {
store Store
youtube YoutubeClient
s3 S3Client
}
func NewMediaSetService(store Store, youtubeClient YoutubeClient, s3Client S3Client) *MediaSetService {
return &MediaSetService{
store: store,
youtube: youtubeClient,
s3: s3Client,
}
}
// Get fetches the metadata for a given MediaSet source.
func (s *MediaSetService) Get(ctx context.Context, youtubeID string) (*MediaSet, error) {
var (
mediaSet *MediaSet
err error
)
mediaSet, err = s.findMediaSet(ctx, youtubeID)
if err != nil {
return nil, fmt.Errorf("error getting existing media set: %v", err)
}
if mediaSet == nil {
mediaSet, err = s.createMediaSet(ctx, youtubeID)
if err != nil {
return nil, fmt.Errorf("error getting new media set: %v", err)
}
}
return mediaSet, nil
}
func (s *MediaSetService) createMediaSet(ctx context.Context, youtubeID string) (*MediaSet, error) {
video, err := s.youtube.GetVideoContext(ctx, youtubeID)
if err != nil {
return nil, fmt.Errorf("error fetching video: %v", err)
}
if len(video.Formats) == 0 {
return nil, errors.New("no format available")
}
audioMetadata, err := s.fetchAudioMetadata(ctx, video)
if err != nil {
return nil, fmt.Errorf("error fetching audio metadata: %v", err)
}
videoMetadata, err := s.fetchVideoMetadata(ctx, video)
if err != nil {
return nil, fmt.Errorf("error fetching video metadata: %v", err)
}
params := store.CreateMediaSetParams{
YoutubeID: youtubeID,
AudioYoutubeItag: int32(audioMetadata.YoutubeItag),
AudioChannels: int32(audioMetadata.Channels),
AudioFramesApprox: audioMetadata.ApproxFrames,
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AudioSampleRate: int32(audioMetadata.SampleRate),
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AudioMimeTypeEncoded: audioMetadata.MimeType,
VideoYoutubeItag: int32(videoMetadata.YoutubeItag),
VideoMimeType: videoMetadata.MimeType,
VideoDurationNanos: videoMetadata.Duration.Nanoseconds(),
}
mediaSet, err := s.store.CreateMediaSet(ctx, params)
if err != nil {
return nil, fmt.Errorf("error creating media set in store: %v", err)
}
return &MediaSet{
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ID: mediaSet.ID,
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YoutubeID: youtubeID,
Audio: audioMetadata,
Video: videoMetadata,
}, nil
}
// findMediaSet fetches a record from the database, returning (nil, nil) if it does not exist.
func (s *MediaSetService) findMediaSet(ctx context.Context, youtubeID string) (*MediaSet, error) {
mediaSet, err := s.store.GetMediaSetByYoutubeID(ctx, youtubeID)
if err != nil {
if err == sql.ErrNoRows {
return nil, nil
}
return nil, fmt.Errorf("error getting existing media set: %v", err)
}
return &MediaSet{
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ID: mediaSet.ID,
YoutubeID: mediaSet.YoutubeID,
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Audio: Audio{
YoutubeItag: int(mediaSet.AudioYoutubeItag),
Bytes: 0, // DEPRECATED
Channels: int(mediaSet.AudioChannels),
ApproxFrames: int64(mediaSet.AudioFramesApprox),
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Frames: mediaSet.AudioFrames.Int64,
SampleRate: int(mediaSet.AudioSampleRate),
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MimeType: mediaSet.AudioMimeTypeEncoded,
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},
Video: Video{
YoutubeItag: int(mediaSet.VideoYoutubeItag),
Bytes: 0, // DEPRECATED?
Duration: time.Duration(mediaSet.VideoDurationNanos),
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MimeType: mediaSet.VideoMimeType,
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ThumbnailWidth: 0, // ??
ThumbnailHeight: 0, // ??
},
}, nil
}
func (s *MediaSetService) fetchVideoMetadata(ctx context.Context, video *youtubev2.Video) (Video, error) {
formats := FilterYoutubeVideo(video.Formats)
if len(video.Formats) == 0 {
return Video{}, errors.New("no format available")
}
format := formats[0]
durationMsecs, err := strconv.Atoi(format.ApproxDurationMs)
if err != nil {
return Video{}, fmt.Errorf("could not parse video duration: %s", err)
}
return Video{
YoutubeItag: format.ItagNo,
MimeType: format.MimeType,
Bytes: format.ContentLength,
ThumbnailWidth: thumbnailWidth,
ThumbnailHeight: thumbnailHeight,
Duration: time.Duration(durationMsecs) * time.Millisecond,
}, nil
}
func (s *MediaSetService) fetchAudioMetadata(ctx context.Context, video *youtubev2.Video) (Audio, error) {
formats := FilterYoutubeAudio(video.Formats)
if len(video.Formats) == 0 {
return Audio{}, errors.New("no format available")
}
format := formats[0]
sampleRate, err := strconv.Atoi(format.AudioSampleRate)
if err != nil {
return Audio{}, fmt.Errorf("invalid samplerate: %s", format.AudioSampleRate)
}
approxDurationMsecs, err := strconv.Atoi(format.ApproxDurationMs)
if err != nil {
return Audio{}, fmt.Errorf("could not parse audio duration: %s", err)
}
approxDuration := time.Duration(approxDurationMsecs) * time.Millisecond
approxFrames := int64(approxDuration/time.Second) * int64(sampleRate)
return Audio{
MimeType: format.MimeType,
YoutubeItag: format.ItagNo,
ApproxFrames: approxFrames,
Channels: format.AudioChannels,
SampleRate: sampleRate,
}, nil
}
// GetAudio fetches the audio part of a MediaSet.
func (s *MediaSetService) GetAudio(ctx context.Context, id uuid.UUID, numBins int) (GetAudioProgressReader, error) {
mediaSet, err := s.store.GetMediaSet(ctx, id)
if err != nil {
return nil, fmt.Errorf("error getting media set: %v", err)
}
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if mediaSet.AudioS3UploadedAt.Valid {
return s.getAudioFromS3(ctx, mediaSet, numBins)
}
return s.getAudioFromYoutube(ctx, mediaSet, numBins)
}
func (s *MediaSetService) getAudioFromS3(ctx context.Context, mediaSet store.MediaSet, numBins int) (GetAudioProgressReader, error) {
input := s3.GetObjectInput{
Bucket: aws.String(mediaSet.AudioS3Bucket.String),
Key: aws.String(mediaSet.AudioS3Key.String),
}
output, err := s.s3.GetObject(ctx, &input)
if err != nil {
return nil, fmt.Errorf("error getting object from s3: %v", err)
}
fetchAudioProgressReader := newGetAudioProgressReader(
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binary.BigEndian,
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int64(mediaSet.AudioFrames.Int64),
int(mediaSet.AudioChannels),
numBins,
)
state := getAudioFromS3State{
fetchAudioProgressReader: fetchAudioProgressReader,
s3Reader: NewModuloBufReader(output.Body, int(mediaSet.AudioChannels)*SizeOfInt16),
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}
go state.run(ctx)
return &state, nil
}
type getAudioFromS3State struct {
*fetchAudioProgressReader
s3Reader io.ReadCloser
}
func (s *getAudioFromS3State) run(ctx context.Context) {
done := make(chan error)
var err error
go func() {
_, copyErr := io.Copy(s, s.s3Reader)
done <- copyErr
}()
outer:
for {
select {
case <-ctx.Done():
err = ctx.Err()
break outer
case err = <-done:
break outer
}
}
if readerErr := s.s3Reader.Close(); readerErr != nil {
if err == nil {
err = readerErr
}
}
if err != nil {
log.Printf("error closing s3Reader: %v", err)
s.Abort(err)
return
}
if iterErr := s.Close(); iterErr != nil {
log.Printf("error closing progress iterator: %v", iterErr)
}
}
func (s *MediaSetService) getAudioFromYoutube(ctx context.Context, mediaSet store.MediaSet, numBins int) (GetAudioProgressReader, error) {
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video, err := s.youtube.GetVideoContext(ctx, mediaSet.YoutubeID)
if err != nil {
return nil, fmt.Errorf("error fetching video: %v", err)
}
format := video.Formats.FindByItag(int(mediaSet.AudioYoutubeItag))
if format == nil {
return nil, fmt.Errorf("error finding itag: %v", err)
}
stream, _, err := s.youtube.GetStreamContext(ctx, video, format)
if err != nil {
return nil, fmt.Errorf("error fetching stream: %v", err)
}
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// wrap it in a progress reader
progressStream := &progressReader{Reader: stream, label: "audio", exp: int(format.ContentLength)}
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ffmpegReader, err := newFfmpegReader(ctx, progressStream, "-i", "-", "-f", rawAudioFormat, "-ar", strconv.Itoa(rawAudioSampleRate), "-acodec", rawAudioCodec, "-")
if err != nil {
return nil, fmt.Errorf("error creating ffmpegreader: %v", err)
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}
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s3Key := fmt.Sprintf("media_sets/%s/audio.raw", mediaSet.ID)
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uploader, err := newMultipartUploadWriter(
ctx,
s.s3,
s3Bucket,
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s3Key,
rawAudioMimeType,
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)
if err != nil {
return nil, fmt.Errorf("error creating uploader: %v", err)
}
fetchAudioProgressReader := newGetAudioProgressReader(
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binary.LittleEndian,
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int64(mediaSet.AudioFramesApprox),
format.AudioChannels,
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numBins,
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)
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state := getAudioFromYoutubeState{
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fetchAudioProgressReader: fetchAudioProgressReader,
ffmpegReader: ffmpegReader,
uploader: uploader,
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s3Bucket: s3Bucket,
s3Key: s3Key,
store: s.store,
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}
go state.run(ctx, mediaSet.ID)
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return &state, nil
}
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type getAudioFromYoutubeState struct {
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*fetchAudioProgressReader
ffmpegReader *ffmpegReader
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uploader *multipartUploadWriter
s3Bucket, s3Key string
store Store
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}
func (s *getAudioFromYoutubeState) run(ctx context.Context, mediaSetID uuid.UUID) {
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mw := io.MultiWriter(s, s.uploader)
done := make(chan error)
var err error
go func() {
_, copyErr := io.Copy(mw, s.ffmpegReader)
// At this point, there is no more data to send to the uploader.
// We can close it safely, it always returns nil.
_ = s.uploader.Close()
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done <- copyErr
}()
outer:
for {
select {
case <-ctx.Done():
err = ctx.Err()
break outer
case err = <-done:
break outer
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}
}
var framesUploaded int64
if err == nil {
if bytesUploaded, uploaderErr := s.uploader.Complete(); uploaderErr != nil {
err = uploaderErr
} else {
framesUploaded = bytesUploaded / int64(s.channels) / SizeOfInt16
}
}
// If there was an error returned, the underlying ffmpegReader process may
// still be active. Kill it.
if err != nil {
if cancelErr := s.ffmpegReader.Cancel(); cancelErr != nil {
log.Printf("error cancelling ffmpegreader: %v", cancelErr)
}
}
// Either way, we need to wait for the ffmpegReader process to exit.
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if readerErr := s.ffmpegReader.Close(); readerErr != nil {
if err == nil {
err = readerErr
}
}
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if err == nil {
_, updateErr := s.store.SetAudioUploaded(ctx, store.SetAudioUploadedParams{
ID: mediaSetID,
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AudioS3Bucket: sqlString(s.s3Bucket),
AudioS3Key: sqlString(s.s3Key),
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AudioFrames: sqlInt64(framesUploaded),
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})
if updateErr != nil {
err = updateErr
}
}
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if err != nil {
log.Printf("error uploading asynchronously: %v", err)
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newCtx, cancel := context.WithTimeout(context.Background(), time.Second*5)
defer cancel()
if abortUploadErr := s.uploader.Abort(newCtx); abortUploadErr != nil {
log.Printf("error aborting uploader: %v", abortUploadErr)
}
s.Abort(err)
return
}
if iterErr := s.Close(); iterErr != nil {
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log.Printf("error closing progress iterator: %v", iterErr)
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}
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}
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func sqlString(s string) sql.NullString {
return sql.NullString{String: s, Valid: true}
}
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func sqlInt64(i int64) sql.NullInt64 {
return sql.NullInt64{Int64: i, Valid: true}
}
type ModuloBufReader struct {
io.ReadCloser
buf bytes.Buffer
modSize int
}
func NewModuloBufReader(r io.ReadCloser, modSize int) *ModuloBufReader {
return &ModuloBufReader{ReadCloser: r, modSize: modSize}
}
func (r *ModuloBufReader) Read(p []byte) (int, error) {
// err is always io.EOF or nil
nr1, _ := r.buf.Read(p)
nr2, err := r.ReadCloser.Read(p[nr1:])
nr := nr1 + nr2
rem := nr % r.modSize
if rem != 0 {
// err is always nil
_, _ = r.buf.Write(p[nr-rem:])
}
return nr - rem, err
}