forked from bluenviron/mediamtx
/
client_downloader_stream.go
258 lines (219 loc) · 6.06 KB
/
client_downloader_stream.go
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package hls
import (
"context"
"fmt"
"io"
"net/http"
"net/url"
"strconv"
"time"
"github.com/aler9/gortsplib"
gm3u8 "github.com/grafov/m3u8"
"github.com/bhaney/rtsp-simple-server/internal/hls/m3u8"
"github.com/bhaney/rtsp-simple-server/internal/logger"
)
func segmentsLen(segments []*gm3u8.MediaSegment) int {
for i, seg := range segments {
if seg == nil {
return i
}
}
return 0
}
func findSegmentWithInvPosition(segments []*gm3u8.MediaSegment, pos int) *gm3u8.MediaSegment {
index := len(segments) - pos
if index < 0 {
return nil
}
return segments[index]
}
func findSegmentWithID(seqNo uint64, segments []*gm3u8.MediaSegment, id uint64) (*gm3u8.MediaSegment, int) {
index := int(int64(id) - int64(seqNo))
if (index) >= len(segments) {
return nil, 0
}
return segments[index], len(segments) - index
}
type clientDownloaderStream struct {
isLeading bool
httpClient *http.Client
playlistURL *url.URL
initialPlaylist *m3u8.MediaPlaylist
logger ClientLogger
rp *clientRoutinePool
onStreamTracks func(context.Context, []gortsplib.Track) bool
onSetLeadingTimeSync func(clientTimeSync)
onGetLeadingTimeSync func(context.Context) (clientTimeSync, bool)
onVideoData func(time.Duration, [][]byte)
onAudioData func(time.Duration, []byte)
curSegmentID *uint64
}
func newClientDownloaderStream(
isLeading bool,
httpClient *http.Client,
playlistURL *url.URL,
initialPlaylist *m3u8.MediaPlaylist,
logger ClientLogger,
rp *clientRoutinePool,
onStreamTracks func(context.Context, []gortsplib.Track) bool,
onSetLeadingTimeSync func(clientTimeSync),
onGetLeadingTimeSync func(context.Context) (clientTimeSync, bool),
onVideoData func(time.Duration, [][]byte),
onAudioData func(time.Duration, []byte),
) *clientDownloaderStream {
return &clientDownloaderStream{
isLeading: isLeading,
httpClient: httpClient,
playlistURL: playlistURL,
initialPlaylist: initialPlaylist,
logger: logger,
rp: rp,
onStreamTracks: onStreamTracks,
onSetLeadingTimeSync: onSetLeadingTimeSync,
onGetLeadingTimeSync: onGetLeadingTimeSync,
onVideoData: onVideoData,
onAudioData: onAudioData,
}
}
func (d *clientDownloaderStream) run(ctx context.Context) error {
initialPlaylist := d.initialPlaylist
d.initialPlaylist = nil
if initialPlaylist == nil {
var err error
initialPlaylist, err = d.downloadPlaylist(ctx)
if err != nil {
return err
}
}
segmentQueue := newClientSegmentQueue()
if initialPlaylist.Map != nil && initialPlaylist.Map.URI != "" {
byts, err := d.downloadSegment(ctx, initialPlaylist.Map.URI, initialPlaylist.Map.Offset, initialPlaylist.Map.Limit)
if err != nil {
return err
}
proc, err := newClientProcessorFMP4(
ctx,
d.isLeading,
byts,
segmentQueue,
d.logger,
d.rp,
d.onStreamTracks,
d.onSetLeadingTimeSync,
d.onGetLeadingTimeSync,
d.onVideoData,
d.onAudioData,
)
if err != nil {
return err
}
d.rp.add(proc)
} else {
proc := newClientProcessorMPEGTS(
d.isLeading,
segmentQueue,
d.logger,
d.rp,
d.onStreamTracks,
d.onSetLeadingTimeSync,
d.onGetLeadingTimeSync,
d.onVideoData,
d.onAudioData,
)
d.rp.add(proc)
}
for {
ok := segmentQueue.waitUntilSizeIsBelow(ctx, 1)
if !ok {
return fmt.Errorf("terminated")
}
err := d.fillSegmentQueue(ctx, segmentQueue)
if err != nil {
return err
}
}
}
func (d *clientDownloaderStream) downloadPlaylist(ctx context.Context) (*m3u8.MediaPlaylist, error) {
d.logger.Log(logger.Debug, "downloading stream playlist %s", d.playlistURL.String())
pl, err := clientDownloadPlaylist(ctx, d.httpClient, d.playlistURL)
if err != nil {
return nil, err
}
plt, ok := pl.(*m3u8.MediaPlaylist)
if !ok {
return nil, fmt.Errorf("invalid playlist")
}
return plt, nil
}
func (d *clientDownloaderStream) downloadSegment(ctx context.Context,
uri string, offset int64, limit int64,
) ([]byte, error) {
u, err := clientAbsoluteURL(d.playlistURL, uri)
if err != nil {
return nil, err
}
d.logger.Log(logger.Debug, "downloading segment %s", u)
req, err := http.NewRequestWithContext(ctx, http.MethodGet, u.String(), nil)
if err != nil {
return nil, err
}
if limit != 0 {
req.Header.Add("Range", "bytes="+strconv.FormatInt(offset, 10)+"-"+strconv.FormatInt(offset+limit-1, 10))
}
res, err := d.httpClient.Do(req)
if err != nil {
return nil, err
}
defer res.Body.Close()
if res.StatusCode != http.StatusOK && res.StatusCode != http.StatusPartialContent {
return nil, fmt.Errorf("bad status code: %d", res.StatusCode)
}
byts, err := io.ReadAll(res.Body)
if err != nil {
return nil, err
}
return byts, nil
}
func (d *clientDownloaderStream) fillSegmentQueue(ctx context.Context, segmentQueue *clientSegmentQueue) error {
pl, err := d.downloadPlaylist(ctx)
if err != nil {
return err
}
pl.Segments = pl.Segments[:segmentsLen(pl.Segments)]
var seg *gm3u8.MediaSegment
if d.curSegmentID == nil {
if !pl.Closed { // live stream: start from clientLiveStartingInvPosition
seg = findSegmentWithInvPosition(pl.Segments, clientLiveStartingInvPosition)
if seg == nil {
return fmt.Errorf("there aren't enough segments to fill the buffer")
}
} else { // VOD stream: start from beginning
if len(pl.Segments) == 0 {
return fmt.Errorf("no segments found")
}
seg = pl.Segments[0]
}
} else {
var invPos int
seg, invPos = findSegmentWithID(pl.SeqNo, pl.Segments, *d.curSegmentID+1)
if seg == nil {
return fmt.Errorf("following segment not found or not ready yet")
}
d.logger.Log(logger.Debug, "segment inverse position: %d", invPos)
if !pl.Closed && invPos > clientLiveMaxInvPosition {
return fmt.Errorf("playback is too late")
}
}
v := seg.SeqId
d.curSegmentID = &v
byts, err := d.downloadSegment(ctx, seg.URI, seg.Offset, seg.Limit)
if err != nil {
return err
}
segmentQueue.push(byts)
if pl.Closed && pl.Segments[len(pl.Segments)-1] == seg {
<-ctx.Done()
return fmt.Errorf("stream has ended")
}
return nil
}