301 lines
8.6 KiB
Go
301 lines
8.6 KiB
Go
package media
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import (
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"bytes"
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"context"
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"encoding/binary"
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"fmt"
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"io"
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"math"
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"os/exec"
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"strconv"
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"sync"
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"git.netflux.io/rob/clipper/config"
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"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"
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"go.uber.org/zap"
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)
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type GetAudioProgress struct {
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PercentComplete float32
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Peaks []int16
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URL string
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}
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type GetAudioProgressReader interface {
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Next() (GetAudioProgress, error)
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Close(string) error
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}
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// audioGetter manages getting and processing audio from Youtube.
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type audioGetter struct {
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store Store
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youtube YoutubeClient
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s3API S3API
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config config.Config
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logger *zap.SugaredLogger
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}
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// newAudioGetter returns a new audioGetter.
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func newAudioGetter(store Store, youtube YoutubeClient, s3API S3API, config config.Config, logger *zap.SugaredLogger) *audioGetter {
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return &audioGetter{
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store: store,
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youtube: youtube,
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s3API: s3API,
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config: config,
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logger: logger,
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}
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}
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// GetAudio gets the audio, processes it and uploads it to S3. It returns a
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// GetAudioProgressReader that can be used to poll progress reports and audio
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// peaks.
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//
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// TODO: accept domain object instead
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func (g *audioGetter) GetAudio(ctx context.Context, mediaSet store.MediaSet, numBins int) (GetAudioProgressReader, error) {
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video, err := g.youtube.GetVideoContext(ctx, mediaSet.YoutubeID)
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if err != nil {
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return nil, fmt.Errorf("error fetching video: %v", err)
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}
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format := video.Formats.FindByItag(int(mediaSet.AudioYoutubeItag))
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if format == nil {
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return nil, fmt.Errorf("error finding itag: %v", err)
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}
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stream, _, err := g.youtube.GetStreamContext(ctx, video, format)
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if err != nil {
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return nil, fmt.Errorf("error fetching stream: %v", err)
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}
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audioProgressReader, err := newGetAudioProgressReader(mediaSet.AudioFramesApprox, int(mediaSet.AudioChannels), numBins)
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if err != nil {
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return nil, fmt.Errorf("error building progress reader: %v", err)
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}
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s := &audioGetterState{
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audioGetter: g,
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getAudioProgressReader: audioProgressReader,
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}
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go s.getAudio(ctx, stream, mediaSet)
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return s, nil
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}
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// audioGetterState represents the state of an individual audio fetch.
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type audioGetterState struct {
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*audioGetter
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*getAudioProgressReader
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}
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func (s *audioGetterState) getAudio(ctx context.Context, r io.ReadCloser, mediaSet store.MediaSet) {
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streamWithProgress := newProgressReader(r, "audio", mediaSet.AudioContentLength, s.logger)
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pr, pw := io.Pipe()
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teeReader := io.TeeReader(streamWithProgress, pw)
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var stdErr bytes.Buffer
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cmd := exec.CommandContext(ctx, "ffmpeg", "-hide_banner", "-loglevel", "error", "-i", "-", "-f", rawAudioFormat, "-ar", strconv.Itoa(rawAudioSampleRate), "-acodec", rawAudioCodec, "-")
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cmd.Stdin = teeReader
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cmd.Stderr = &stdErr
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stdout, err := cmd.StdoutPipe()
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if err != nil {
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s.CloseWithError(fmt.Errorf("error getting stdout: %v", err))
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return
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}
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if err = cmd.Start(); err != nil {
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s.CloseWithError(fmt.Errorf("error starting command: %v, output: %s", err, stdErr.String()))
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return
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}
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var presignedAudioURL string
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var wg sync.WaitGroup
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wg.Add(2)
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// Upload the encoded audio.
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go func() {
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defer wg.Done()
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// TODO: use mediaSet func to fetch s3Key
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s3Key := fmt.Sprintf("media_sets/%s/audio.opus", mediaSet.ID)
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uploader := newMultipartUploader(s.s3API, s.logger)
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_, encErr := uploader.Upload(ctx, pr, s.config.S3Bucket, s3Key, "audio/opus")
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if encErr != nil {
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s.CloseWithError(fmt.Errorf("error uploading encoded audio: %v", encErr))
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return
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}
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input := s3.GetObjectInput{
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Bucket: aws.String(s.config.S3Bucket),
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Key: aws.String(s3Key),
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}
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request, err := s.s3API.PresignGetObject(ctx, &input, s3.WithPresignExpires(getAudioExpiresIn))
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if err != nil {
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s.CloseWithError(fmt.Errorf("error generating presigned URL: %v", err))
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}
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presignedAudioURL = request.URL
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if _, err = s.store.SetEncodedAudioUploaded(ctx, store.SetEncodedAudioUploadedParams{
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ID: mediaSet.ID,
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AudioEncodedS3Bucket: sqlString(s.config.S3Bucket),
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AudioEncodedS3Key: sqlString(s3Key),
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}); err != nil {
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s.CloseWithError(fmt.Errorf("error setting encoded audio uploaded: %v", err))
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}
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}()
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// Upload the raw audio.
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go func() {
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defer wg.Done()
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// TODO: use mediaSet func to fetch s3Key
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s3Key := fmt.Sprintf("media_sets/%s/audio.raw", mediaSet.ID)
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teeReader := io.TeeReader(stdout, s)
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uploader := newMultipartUploader(s.s3API, s.logger)
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bytesUploaded, rawErr := uploader.Upload(ctx, teeReader, s.config.S3Bucket, s3Key, rawAudioMimeType)
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if rawErr != nil {
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s.CloseWithError(fmt.Errorf("error uploading raw audio: %v", rawErr))
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return
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}
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if _, err = s.store.SetRawAudioUploaded(ctx, store.SetRawAudioUploadedParams{
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ID: mediaSet.ID,
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AudioRawS3Bucket: sqlString(s.config.S3Bucket),
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AudioRawS3Key: sqlString(s3Key),
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AudioFrames: sqlInt64(bytesUploaded / SizeOfInt16 / int64(mediaSet.AudioChannels)),
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}); err != nil {
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s.CloseWithError(fmt.Errorf("error setting raw audio uploaded: %v", err))
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}
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}()
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if err = cmd.Wait(); err != nil {
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// TODO: cancel other goroutines (e.g. video fetch) if an error occurs here.
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s.CloseWithError(fmt.Errorf("error waiting for command: %v, output: %s", err, stdErr.String()))
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return
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}
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// Close the pipe sending encoded audio to be uploaded, this ensures the
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// uploader reading from the pipe will receive io.EOF and complete
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// successfully.
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pw.Close()
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// Wait for the uploaders to complete.
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wg.Wait()
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// Finally, close the progress reader so that the subsequent call to Next()
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// returns the presigned URL and io.EOF.
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s.Close(presignedAudioURL)
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}
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// getAudioProgressReader accepts a byte stream containing little endian
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// signed int16s and, given a target number of bins, emits a stream of peaks
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// corresponding to each channel of the audio data.
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type getAudioProgressReader struct {
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framesExpected int64
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channels int
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framesPerBin int
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samples []int16
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currPeaks []int16
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currCount int
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framesProcessed int64
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url string
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progress chan GetAudioProgress
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errorChan chan error
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}
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func newGetAudioProgressReader(framesExpected int64, channels, numBins int) (*getAudioProgressReader, error) {
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if framesExpected <= 0 || channels <= 0 || numBins <= 0 {
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return nil, fmt.Errorf("error creating audio progress reader (framesExpected = %d, channels = %d, numBins = %d)", framesExpected, channels, numBins)
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}
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return &getAudioProgressReader{
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channels: channels,
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framesExpected: framesExpected,
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framesPerBin: int(math.Ceil(float64(framesExpected) / float64(numBins))),
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samples: make([]int16, 8_192),
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currPeaks: make([]int16, channels),
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progress: make(chan GetAudioProgress),
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errorChan: make(chan error, 1),
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}, nil
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}
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func (w *getAudioProgressReader) CloseWithError(err error) {
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w.errorChan <- err
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}
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// Close cloes the reader and returns the provided URL to the calling code.
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func (w *getAudioProgressReader) Close(url string) error {
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w.url = url
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close(w.progress)
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return nil
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}
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func (w *getAudioProgressReader) Next() (GetAudioProgress, error) {
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for {
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select {
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case progress, ok := <-w.progress:
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if !ok {
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return GetAudioProgress{Peaks: w.currPeaks, PercentComplete: w.percentComplete(), URL: w.url}, io.EOF
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}
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return progress, nil
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case err := <-w.errorChan:
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return GetAudioProgress{}, fmt.Errorf("error waiting for progress: %v", err)
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}
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}
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}
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func (w *getAudioProgressReader) Write(p []byte) (int, error) {
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// expand our target slice if it is of insufficient size:
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numSamples := len(p) / SizeOfInt16
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if len(w.samples) < numSamples {
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w.samples = append(w.samples, make([]int16, numSamples-len(w.samples))...)
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}
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samples := w.samples[:numSamples]
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if err := binary.Read(bytes.NewReader(p), binary.LittleEndian, samples); err != nil {
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return 0, fmt.Errorf("error parsing samples: %v", err)
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}
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for i := 0; i < len(samples); i += w.channels {
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for j := 0; j < w.channels; j++ {
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samp := samples[i+j]
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if samp < 0 {
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samp = -samp
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}
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if samp > w.currPeaks[j] {
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w.currPeaks[j] = samp
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}
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}
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w.currCount++
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if w.currCount == w.framesPerBin {
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w.nextBin()
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}
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}
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w.framesProcessed += int64(len(samples) / w.channels)
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return len(p), nil
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}
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func (w *getAudioProgressReader) percentComplete() float32 {
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return (float32(w.framesProcessed) / float32(w.framesExpected)) * 100.0
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}
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func (w *getAudioProgressReader) nextBin() {
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var progress GetAudioProgress
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progress.Peaks = append(progress.Peaks, w.currPeaks...)
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progress.PercentComplete = w.percentComplete()
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w.progress <- progress
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w.currCount = 0
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for i := 0; i < len(w.currPeaks); i++ {
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w.currPeaks[i] = 0
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}
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}
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