330 lines
9.3 KiB
Go
330 lines
9.3 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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"strconv"
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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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"go.uber.org/zap"
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"golang.org/x/sync/errgroup"
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)
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type GetPeaksProgress struct {
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PercentComplete float32
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Peaks []int16
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URL string
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AudioFrames int64
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}
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type GetPeaksProgressReader interface {
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Next() (GetPeaksProgress, 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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fileStore FileStore
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commandFunc CommandFunc
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workerPool *WorkerPool
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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, fileStore FileStore, commandFunc CommandFunc, workerPool *WorkerPool, 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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fileStore: fileStore,
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commandFunc: commandFunc,
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workerPool: workerPool,
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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 a file store. It
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// returns a GetAudioProgressReader that can be used to poll progress reports
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// and audio 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) (GetPeaksProgressReader, 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: %d", mediaSet.AudioYoutubeItag)
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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 := newGetPeaksProgressReader(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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getPeaksProgressReader: audioProgressReader,
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}
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go func() {
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if err := g.workerPool.WaitForTask(ctx, func() error { return s.getAudio(ctx, stream, mediaSet) }); err != nil {
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// the progress reader is closed inside the worker in the non-error case.
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s.CloseWithError(err)
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}
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}()
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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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*getPeaksProgressReader
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}
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func (s *audioGetterState) getAudio(ctx context.Context, r io.ReadCloser, mediaSet store.MediaSet) error {
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streamWithProgress := newLogProgressReader(r, "audio", mediaSet.AudioContentLength, s.logger)
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var stdErr bytes.Buffer
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cmd := s.commandFunc(ctx, "ffmpeg", "-hide_banner", "-loglevel", "error", "-i", "-", "-f", rawAudioFormat, "-ar", strconv.Itoa(rawAudioSampleRate), "-acodec", rawAudioCodec, "-")
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cmd.Stderr = &stdErr
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// ffmpegWriter accepts encoded audio and pipes it to FFmpeg.
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ffmpegWriter, err := cmd.StdinPipe()
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if err != nil {
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return fmt.Errorf("error getting stdin: %v", err)
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}
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uploadReader, uploadWriter := io.Pipe()
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mw := io.MultiWriter(uploadWriter, ffmpegWriter)
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// ffmpegReader delivers raw audio output from FFmpeg, and also writes it
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// back to the progress reader.
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var ffmpegReader io.Reader
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if stdoutPipe, err := cmd.StdoutPipe(); err == nil {
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ffmpegReader = io.TeeReader(stdoutPipe, s)
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} else {
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return fmt.Errorf("error getting stdout: %v", err)
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}
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var presignedAudioURL string
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g, ctx := errgroup.WithContext(ctx)
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// Upload the encoded audio.
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g.Go(func() error {
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// TODO: use mediaSet func to fetch key
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key := fmt.Sprintf("media_sets/%s/audio.opus", mediaSet.ID)
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_, encErr := s.fileStore.PutObject(ctx, key, uploadReader, "audio/opus")
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if encErr != nil {
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return fmt.Errorf("error uploading encoded audio: %v", encErr)
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}
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presignedAudioURL, encErr = s.fileStore.GetURL(ctx, key)
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if encErr != nil {
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return fmt.Errorf("error generating presigned URL: %v", encErr)
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}
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if _, encErr = s.store.SetEncodedAudioUploaded(ctx, store.SetEncodedAudioUploadedParams{
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ID: mediaSet.ID,
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AudioEncodedS3Key: sqlString(key),
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}); encErr != nil {
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return fmt.Errorf("error setting encoded audio uploaded: %v", encErr)
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}
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return nil
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})
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// Upload the raw audio.
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g.Go(func() error {
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// TODO: use mediaSet func to fetch key
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key := fmt.Sprintf("media_sets/%s/audio.raw", mediaSet.ID)
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bytesUploaded, rawErr := s.fileStore.PutObject(ctx, key, ffmpegReader, rawAudioMimeType)
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if rawErr != nil {
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return fmt.Errorf("error uploading raw audio: %v", rawErr)
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}
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if _, rawErr = s.store.SetRawAudioUploaded(ctx, store.SetRawAudioUploadedParams{
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ID: mediaSet.ID,
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AudioRawS3Key: sqlString(key),
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AudioFrames: sqlInt64(bytesUploaded / SizeOfInt16 / int64(mediaSet.AudioChannels)),
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}); rawErr != nil {
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return fmt.Errorf("error setting raw audio uploaded: %v", rawErr)
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}
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return nil
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})
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g.Go(func() error {
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if _, err := io.Copy(mw, streamWithProgress); err != nil {
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return fmt.Errorf("error copying: %v", err)
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}
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// ignoring the following Close errors should be ok, as the Copy has
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// already completed successfully.
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if err := ffmpegWriter.Close(); err != nil {
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s.logger.With("err", err).Warn("getAudio: unable to close ffmpegWriter")
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}
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if err := uploadWriter.Close(); err != nil {
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s.logger.With("err", err).Warn("getAudio: unable to close pipeWriter")
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}
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if err := r.Close(); err != nil {
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s.logger.With("err", err).Warn("getAudio: unable to close stream")
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}
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return nil
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})
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if err := cmd.Start(); err != nil {
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return fmt.Errorf("error starting command: %v, output: %s", err, stdErr.String())
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}
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if err := g.Wait(); err != nil {
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return fmt.Errorf("error uploading: %v", err)
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}
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if err := cmd.Wait(); err != nil {
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return fmt.Errorf("error waiting for command: %v, output: %s", err, stdErr.String())
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}
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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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return nil
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}
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// getPeaksProgressReader 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 getPeaksProgressReader 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 GetPeaksProgress
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errorChan chan error
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}
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func newGetPeaksProgressReader(framesExpected int64, channels, numBins int) (*getPeaksProgressReader, 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 &getPeaksProgressReader{
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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 GetPeaksProgress),
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errorChan: make(chan error, 1),
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}, nil
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}
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func (w *getPeaksProgressReader) 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 *getPeaksProgressReader) 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 *getPeaksProgressReader) Next() (GetPeaksProgress, 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 GetPeaksProgress{
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Peaks: w.currPeaks,
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PercentComplete: w.percentComplete(),
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URL: w.url,
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AudioFrames: w.framesProcessed,
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}, 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 GetPeaksProgress{}, 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 *getPeaksProgressReader) 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 *getPeaksProgressReader) 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 *getPeaksProgressReader) nextBin() {
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var progress GetPeaksProgress
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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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