func (m *mp4Handler) RequestHandle(ctx context.Context, w http.ResponseWriter, r *http.Request) {
// Handle only GET requests with ContentLength of 0 without a Range header
if r.Method != "GET" || len(r.Header.Get("Range")) > 0 || r.ContentLength > 0 {
m.next.RequestHandle(ctx, w, r)
return
}
// parse the request
var start, err = strconv.Atoi(r.URL.Query().Get(startKey))
if err != nil || 0 >= start { // that start is not ok
m.next.RequestHandle(ctx, w, r)
return
}
var startTime = time.Duration(start) * time.Second
var newreq = copyRequest(r)
removeQueryArgument(newreq.URL, startKey)
var header = make(http.Header)
var rr = &rangeReader{
ctx: ctx,
req: copyRequest(newreq),
location: m.loc,
next: m.next,
callback: func(frw *httputils.FlexibleResponseWriter) bool {
if len(header) == 0 {
httputils.CopyHeadersWithout(frw.Header(), header, skipHeaders...)
} else {
return frw.Header().Get("Last-Modified") == header.Get("Last-Modified")
}
return true
},
}
var video *mp4.MP4
video, err = mp4.Decode(rr)
if err != nil {
m.loc.Logger.Errorf("error from the mp4.Decode - %s", err)
m.next.RequestHandle(ctx, w, r)
return
}
if video == nil || video.Moov == nil { // missing something?
m.next.RequestHandle(ctx, w, r)
return
}
cl, err := clip.New(video, startTime, rr)
if err != nil {
m.loc.Logger.Errorf("error while clipping a video(%+v) - %s", video, err)
m.next.RequestHandle(ctx, w, r)
return
}
httputils.CopyHeaders(header, w.Header())
w.Header().Set("Content-Length", strconv.FormatUint(cl.Size(), 10))
size, err := cl.WriteTo(w)
m.loc.Logger.Debugf("wrote %d", size)
if err != nil {
m.loc.Logger.Logf("error on writing the clip response - %s", err)
}
if uint64(size) != cl.Size() {
m.loc.Logger.Debugf("handler.mp4[%p]: expected to write %d but wrote %d", m, cl.Size(), size)
}
}
func main() {
go func() {
fmt.Println(http.ListenAndServe(":6060", nil))
}()
cmd := cli.App("mp4tool", "MP4 command line tool")
cmd.Command("info", "Displays information about a media", func(cmd *cli.Cmd) {
file := cmd.StringArg("FILE", "", "the file to display")
cmd.Action = func() {
rr := &fileRangeReader{fileName: *file}
v, err := mp4.Decode(rr)
if err != nil {
fmt.Println(err)
}
v.Dump()
}
})
cmd.Command("clip", "Generates a clip", func(cmd *cli.Cmd) {
start := cmd.IntOpt("s start", 0, "start time (sec)")
src := cmd.StringArg("SRC", "", "the source file name")
dst := cmd.StringArg("DST", "", "the destination file name")
cmd.Action = func() {
rr := &fileRangeReader{fileName: *src}
v, err := mp4.Decode(rr)
if err != nil {
fmt.Println(err)
return
}
out, err := os.Create(*dst)
if err != nil {
fmt.Println(err)
return
}
defer closeWithPrintingError(out, "error on closing output file")
clip, err := clip.New(v, time.Duration(*start)*time.Second, rr)
if err != nil {
fmt.Println(err)
return
}
fmt.Scanln()
size, err := clip.WriteTo(out)
if err != nil {
fmt.Println(err)
}
fmt.Println("wrote", size)
}
})
cmd.Command("copy", "Decodes a media and reencodes it to another file", func(cmd *cli.Cmd) {
src := cmd.StringArg("SRC", "", "the source file name")
dst := cmd.StringArg("DST", "", "the destination file name")
cmd.Action = func() {
rr := &fileRangeReader{fileName: *src}
v, err := mp4.Decode(rr)
if err != nil {
fmt.Println(err)
return
}
out, err := os.Create(*dst)
if err != nil {
fmt.Println(err)
return
}
defer closeWithPrintingError(out, "error on closing output file")
if err := v.Encode(out); err != nil {
fmt.Println("error on encoding", err)
}
}
})
if err := cmd.Run(os.Args); err != nil {
fmt.Println("error form cmd.Run", err)
}
fmt.Println("press return to exit the program")
fmt.Scanln()
}
