Files
go2rtc/internal/hls/session.go
2023-08-20 09:57:46 +03:00

128 lines
2.3 KiB
Go

package hls
import (
"fmt"
"io"
"strings"
"sync"
"time"
"github.com/AlexxIT/go2rtc/pkg/core"
"github.com/AlexxIT/go2rtc/pkg/mp4"
)
type Session struct {
cons core.Consumer
id string
template string
init []byte
buffer []byte
seq int
alive *time.Timer
mu sync.Mutex
}
func NewSession(cons core.Consumer) *Session {
s := &Session{
id: core.RandString(8, 62),
cons: cons,
}
// two segments important for Chromecast
if _, ok := cons.(*mp4.Consumer); ok {
s.template = `#EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:1
#EXT-X-MEDIA-SEQUENCE:%d
#EXT-X-MAP:URI="init.mp4?id=` + s.id + `"
#EXTINF:0.500,
segment.m4s?id=` + s.id + `&n=%d
#EXTINF:0.500,
segment.m4s?id=` + s.id + `&n=%d`
} else {
s.template = `#EXTM3U
#EXT-X-VERSION:3
#EXT-X-TARGETDURATION:1
#EXT-X-MEDIA-SEQUENCE:%d
#EXTINF:0.500,
segment.ts?id=` + s.id + `&n=%d
#EXTINF:0.500,
segment.ts?id=` + s.id + `&n=%d`
}
return s
}
func (s *Session) Write(p []byte) (n int, err error) {
s.mu.Lock()
if s.init == nil {
s.init = p
} else {
s.buffer = append(s.buffer, p...)
}
s.mu.Unlock()
return len(p), nil
}
func (s *Session) Run() {
_, _ = s.cons.(io.WriterTo).WriteTo(s)
}
func (s *Session) Main() []byte {
type withCodecs interface {
Codecs() []*core.Codec
}
codecs := mp4.MimeCodecs(s.cons.(withCodecs).Codecs())
codecs = strings.Replace(codecs, mp4.MimeFlac, "fLaC", 1)
// bandwidth important for Safari, codecs useful for smooth playback
return []byte(`#EXTM3U
#EXT-X-STREAM-INF:BANDWIDTH=192000,CODECS="` + codecs + `"
hls/playlist.m3u8?id=` + s.id)
}
func (s *Session) Playlist() []byte {
return []byte(fmt.Sprintf(s.template, s.seq, s.seq, s.seq+1))
}
func (s *Session) Init() (init []byte) {
for i := 0; i < 60 && init == nil; i++ {
if i > 0 {
time.Sleep(50 * time.Millisecond)
}
s.mu.Lock()
// return init only when have some buffer
if len(s.buffer) > 0 {
init = s.init
}
s.mu.Unlock()
}
return
}
func (s *Session) Segment() (segment []byte) {
for i := 0; i < 60 && segment == nil; i++ {
if i > 0 {
time.Sleep(50 * time.Millisecond)
}
s.mu.Lock()
if len(s.buffer) > 0 {
segment = s.buffer
if _, ok := s.cons.(*mp4.Consumer); ok {
s.buffer = nil
} else {
// for TS important to start new segment with init
s.buffer = s.init
}
s.seq++
}
s.mu.Unlock()
}
return
}