/
reader.go
165 lines (130 loc) · 2.87 KB
/
reader.go
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package hls
import (
"bytes"
"io"
"net/http"
"net/url"
"regexp"
"time"
"github.com/AlexxIT/go2rtc/pkg/core"
)
type reader struct {
client *http.Client
request *http.Request
playlist []byte
lastSegment []byte
lastTime time.Time
buf []byte
}
func NewReader(u *url.URL, body io.ReadCloser) (io.Reader, error) {
b, err := io.ReadAll(body)
if err != nil {
return nil, err
}
var rawURL string
re := regexp.MustCompile(`#EXT-X-STREAM-INF.+?\n(\S+)`)
m := re.FindSubmatch(b)
if m != nil {
ref, err := url.Parse(string(m[1]))
if err != nil {
return nil, err
}
rawURL = u.ResolveReference(ref).String()
} else {
rawURL = u.String()
}
req, err := http.NewRequest("GET", rawURL, nil)
if err != nil {
return nil, err
}
rd := &reader{
client: &http.Client{Timeout: core.ConnDialTimeout},
request: req,
}
return rd, nil
}
func (r *reader) Read(dst []byte) (n int, err error) {
// 1. Check temporary tempbuffer
if len(r.buf) == 0 {
src, err2 := r.getSegment()
if err2 != nil {
return 0, err2
}
// 2. Check if the message fits in the buffer
if len(src) <= len(dst) {
return copy(dst, src), nil
}
// 3. Put the message into a temporary buffer
r.buf = src
}
// 4. Send temporary buffer
n = copy(dst, r.buf)
r.buf = r.buf[n:]
return
}
func (r *reader) Close() error {
r.client.Transport = r // after close we fail on next request
return nil
}
func (r *reader) RoundTrip(_ *http.Request) (*http.Response, error) {
return nil, io.EOF
}
func (r *reader) getSegment() ([]byte, error) {
for i := 0; i < 5; i++ {
if r.playlist == nil {
if wait := time.Second - time.Since(r.lastTime); wait > 0 {
time.Sleep(wait)
}
// 1. Load playlist
res, err := r.client.Do(r.request)
if err != nil {
return nil, err
}
r.playlist, err = io.ReadAll(res.Body)
if err != nil {
return nil, err
}
r.lastTime = time.Now()
//log.Printf("[hls] load playlist\n%s", r.playlist)
}
for r.playlist != nil {
// 2. Remove all previous segments from playlist
if i := bytes.Index(r.playlist, r.lastSegment); i > 0 {
r.playlist = r.playlist[i:]
}
// 3. Get link to new segment
segment := getSegment(r.playlist)
if segment == nil {
r.playlist = nil
break
}
//log.Printf("[hls] load segment: %s", segment)
ref, err := url.Parse(string(segment))
if err != nil {
return nil, err
}
ref = r.request.URL.ResolveReference(ref)
res, err := r.client.Get(ref.String())
if err != nil {
return nil, err
}
r.lastSegment = segment
return io.ReadAll(res.Body)
}
}
return nil, io.EOF
}
func getSegment(src []byte) []byte {
for ok := false; !ok; {
ok = bytes.HasPrefix(src, []byte("#EXTINF"))
i := bytes.IndexByte(src, '\n') + 1
if i == 0 {
return nil
}
src = src[i:]
}
if i := bytes.IndexByte(src, '\n'); i > 0 {
return src[:i]
}
return src
}