initial commit
This commit is contained in:
commit
5163160bf3
4
.gitignore
vendored
Normal file
4
.gitignore
vendored
Normal file
@ -0,0 +1,4 @@
|
||||
*.mkv
|
||||
loadtup-dl
|
||||
|
||||
|
||||
21
README.md
Normal file
21
README.md
Normal file
@ -0,0 +1,21 @@
|
||||
# loadtup-dl
|
||||
|
||||
A tool to download subtitled videos from the website loadtup.com.
|
||||
|
||||
It downloads videos using `youtube-dl`; parses and converts loadtup's custom subtitle format to srt; and remuxes them together using `mkvmerge`, including the CRC32 in the resulting filename.
|
||||
|
||||
## Usage
|
||||
|
||||
```
|
||||
Usage: loadtup-dl [options] [--] URL|- [URL...]
|
||||
|
||||
Supported URLs take the form 'https://loadtup.com/abcdefghijk'. Use a hyphen to
|
||||
read equivalent loadtup.com HTML content from stdin.
|
||||
|
||||
Options:
|
||||
--youtube-dl PATH Override path to youtube-dl
|
||||
--mkvmerge PATH Override path to mkvmerge
|
||||
--output PATH Override output filename
|
||||
(only valid for a single URL)
|
||||
--delete-temporary=false Preserve temporary files
|
||||
```
|
||||
29
crc32writer.go
Normal file
29
crc32writer.go
Normal file
@ -0,0 +1,29 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"hash"
|
||||
"hash/crc32"
|
||||
"io"
|
||||
)
|
||||
|
||||
// @ref https://stackoverflow.com/a/64419012
|
||||
|
||||
func NewCRCwriter(poly uint32, w io.Writer) *CRCwriter {
|
||||
return &CRCwriter{
|
||||
h: crc32.New(crc32.MakeTable(poly)),
|
||||
w: w,
|
||||
}
|
||||
}
|
||||
|
||||
type CRCwriter struct {
|
||||
h hash.Hash32
|
||||
w io.Writer
|
||||
}
|
||||
|
||||
func (c *CRCwriter) Write(p []byte) (n int, err error) {
|
||||
n, err = c.w.Write(p) // with each write ...
|
||||
c.h.Write(p) // ... update the hash
|
||||
return
|
||||
}
|
||||
|
||||
func (c *CRCwriter) Sum() uint32 { return c.h.Sum32() } // final hash
|
||||
344
main.go
Normal file
344
main.go
Normal file
@ -0,0 +1,344 @@
|
||||
package main
|
||||
|
||||
import (
|
||||
"context"
|
||||
"encoding/json"
|
||||
"errors"
|
||||
"flag"
|
||||
"fmt"
|
||||
"hash/crc32"
|
||||
"io"
|
||||
"io/ioutil"
|
||||
"net/http"
|
||||
"os"
|
||||
"os/exec"
|
||||
"path/filepath"
|
||||
"regexp"
|
||||
"strconv"
|
||||
"strings"
|
||||
"time"
|
||||
)
|
||||
|
||||
type loadTupContent struct {
|
||||
Title string
|
||||
VideoID string
|
||||
Interval float64
|
||||
Secs []float64
|
||||
Caps []string
|
||||
Scrsecs []float64
|
||||
Scrcaps []string
|
||||
}
|
||||
|
||||
func parse_json_floats(part []byte) ([]float64, error) {
|
||||
secsStrings := make([]string, 0)
|
||||
err := json.Unmarshal(part, &secsStrings)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
ret := make([]float64, 0, len(secsStrings))
|
||||
for _, sec := range secsStrings {
|
||||
ff, err := strconv.ParseFloat(sec, 64)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
ret = append(ret, ff)
|
||||
}
|
||||
return ret, nil
|
||||
}
|
||||
|
||||
func NewLoadTupContent(content []byte) (*loadTupContent, error) {
|
||||
|
||||
var err error
|
||||
rx := regexp.MustCompile(`videoIdMain = "([^"]+)";var interval = (\d+);var secs = (.+?);var caps = (.+?);var scrsecs = (.+?);var scrcaps = (.+?);</script>`)
|
||||
|
||||
parts := rx.FindStringSubmatch(string(content))
|
||||
if parts == nil {
|
||||
return nil, errors.New("Missing video properties in HTML page")
|
||||
}
|
||||
|
||||
if len(parts) != 7 {
|
||||
return nil, fmt.Errorf("expected len(parts)=7, got %d", len(parts))
|
||||
}
|
||||
|
||||
ltc := loadTupContent{}
|
||||
ltc.VideoID = parts[1]
|
||||
ltc.Interval, err = strconv.ParseFloat(parts[2], 64)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
ltc.Secs, err = parse_json_floats([]byte(parts[3]))
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
err = json.Unmarshal([]byte(parts[4]), <c.Caps)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
ltc.Scrsecs, err = parse_json_floats([]byte(parts[5]))
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
err = json.Unmarshal([]byte(parts[6]), <c.Scrcaps)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Parse the page title
|
||||
|
||||
rx = regexp.MustCompile(`(?ms)<h2 style="margin:0 0 0 0;">(.+?)</h2>`)
|
||||
parts = rx.FindStringSubmatch(string(content))
|
||||
if parts == nil {
|
||||
return nil, errors.New("Missing title in HTML page")
|
||||
}
|
||||
|
||||
if len(parts) != 2 {
|
||||
return nil, fmt.Errorf("expected len(parts)=2, got %d", len(parts))
|
||||
}
|
||||
|
||||
ltc.Title = strings.TrimSpace(parts[1])
|
||||
|
||||
return <c, nil
|
||||
}
|
||||
|
||||
func (ltc *loadTupContent) Validate() error {
|
||||
if len(ltc.Secs) != len(ltc.Caps) {
|
||||
return fmt.Errorf("secs/caps length mismatch")
|
||||
}
|
||||
|
||||
if len(ltc.Scrsecs) != len(ltc.Scrcaps) {
|
||||
return fmt.Errorf("scrsecs/scrcaps length mismatch")
|
||||
}
|
||||
|
||||
if !(len(ltc.Scrcaps) == 0 || ltc.Scrcaps[0] == "") {
|
||||
return errors.New("unsupported use of strcaps")
|
||||
}
|
||||
|
||||
if len(ltc.VideoID) == 0 {
|
||||
return errors.New("unexpected blank video ID")
|
||||
}
|
||||
|
||||
if ltc.Interval != 100.0 {
|
||||
return errors.New("unsupported non-100 duration field")
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func secs_to_srt_time(secs float64) string {
|
||||
dur := time.Duration(secs) * time.Second
|
||||
|
||||
hh := int64(dur.Hours())
|
||||
mm := int64(dur.Minutes()) - (hh * 60)
|
||||
ss := int64(dur.Seconds()) - (hh * 3600) - (mm * 60)
|
||||
ms := int64(dur.Milliseconds()) - (hh * 3600000) - (mm * 60000) - (ss * 1000)
|
||||
|
||||
return fmt.Sprintf("%02d:%02d:%02d,%03d", hh, mm, ss, ms)
|
||||
}
|
||||
|
||||
func (ltc *loadTupContent) WriteSRT(w io.Writer) error {
|
||||
/*
|
||||
|
||||
SRT file format (example from Wikipedia):
|
||||
|
||||
1
|
||||
00:02:17,440 --> 00:02:20,375
|
||||
Senator, we're making
|
||||
our final approach into Coruscant.
|
||||
|
||||
2
|
||||
00:02:20,476 --> 00:02:22,501
|
||||
Very good, Lieutenant.
|
||||
*/
|
||||
|
||||
ctr := 1
|
||||
for i := 0; i < len(ltc.Caps); i += 1 {
|
||||
if ltc.Caps[i] == "" {
|
||||
// Don't show anything
|
||||
continue
|
||||
}
|
||||
|
||||
start := secs_to_srt_time(ltc.Secs[i])
|
||||
var end string
|
||||
if i < len(ltc.Caps)-1 {
|
||||
end = secs_to_srt_time(ltc.Secs[i+1])
|
||||
} else {
|
||||
// The final subtitle. We don't know how long it should be displayed
|
||||
// for since we don't know the entire video's duration
|
||||
// FIXME supply
|
||||
// Assume 3 seconds
|
||||
end = secs_to_srt_time(ltc.Secs[i] + 3)
|
||||
}
|
||||
|
||||
fmt.Fprintf(w, "%d\n%s --> %s\n%s\n\n",
|
||||
ctr, start, end, ltc.Caps[i])
|
||||
// We emitted a message, increase the counter
|
||||
ctr += 1
|
||||
}
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
type config struct {
|
||||
youtubeDl string
|
||||
mkvmerge string
|
||||
overrideOutput string
|
||||
deleteTemporaries bool
|
||||
}
|
||||
|
||||
func performDownload(ctx context.Context, cfg *config, targetUrl string) error {
|
||||
|
||||
//
|
||||
|
||||
var content []byte
|
||||
var err error
|
||||
if targetUrl == "-" {
|
||||
// Read HTML page from stdin
|
||||
content, err = ioutil.ReadAll(os.Stdin)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
} else {
|
||||
// Download HTML page from URL
|
||||
resp, err := http.Get(targetUrl)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
content, err = ioutil.ReadAll(resp.Body)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
_ = resp.Body.Close() // swallow error
|
||||
}
|
||||
|
||||
ltc, err := NewLoadTupContent(content)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
err = ltc.Validate()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Create temporary directory
|
||||
tmpdir, err := ioutil.TempDir("", "loadtup-dl-")
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
if cfg.deleteTemporaries {
|
||||
defer os.RemoveAll(tmpdir)
|
||||
}
|
||||
|
||||
// Download the video
|
||||
ytdl := exec.CommandContext(ctx, cfg.youtubeDl, `-f`, `bestvideo+bestaudio`, "https://youtu.be/"+ltc.VideoID, `--merge-output-format`, `mkv`, "-o", filepath.Join(tmpdir, "downloaded"))
|
||||
ytdl.Stdout = os.Stdout
|
||||
ytdl.Stderr = os.Stderr
|
||||
err = ytdl.Run()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Determine video's total length
|
||||
|
||||
// Create the subtitle file (clamped to total length)
|
||||
|
||||
fh, err := os.OpenFile(filepath.Join(tmpdir, "subtitles.srt"), os.O_CREATE|os.O_WRONLY, 0600)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
err = ltc.WriteSRT(fh)
|
||||
fh.Close()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Mux the subtitles into the file
|
||||
|
||||
mkvm := exec.CommandContext(ctx, cfg.mkvmerge, `-o`, filepath.Join(tmpdir, "muxed.mkv"), filepath.Join(tmpdir, "downloaded.mkv"), filepath.Join(tmpdir, "subtitles.srt"))
|
||||
mkvm.Stdout = os.Stdout
|
||||
mkvm.Stderr = os.Stderr
|
||||
err = mkvm.Run()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Determine final filename
|
||||
outputFile := cfg.overrideOutput
|
||||
if outputFile == "" {
|
||||
// Generate the CRC32 and put it into the filename
|
||||
hw := NewCRCwriter(crc32.IEEE, ioutil.Discard)
|
||||
fhm, err := os.OpenFile(filepath.Join(tmpdir, "muxed.mkv"), os.O_RDONLY, 0400)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
_, err = io.Copy(hw, fhm)
|
||||
fhm.Close()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
outputFile = fmt.Sprintf(`[Loadtup] %s [%08X].mkv`, ltc.Title, hw.Sum())
|
||||
}
|
||||
|
||||
err = os.Rename(filepath.Join(tmpdir, "muxed.mkv"), outputFile)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// Done
|
||||
|
||||
return nil
|
||||
}
|
||||
|
||||
func usage() {
|
||||
fmt.Fprintln(os.Stderr, `Usage: loadtup-dl [options] [--] URL|- [URL...]
|
||||
|
||||
Supported URLs take the form 'https://loadtup.com/abcdefghijk'. Use a hyphen to
|
||||
read equivalent loadtup.com HTML content from stdin.
|
||||
|
||||
Options:
|
||||
--youtube-dl PATH Override path to youtube-dl
|
||||
--mkvmerge PATH Override path to mkvmerge
|
||||
--output PATH Override output filename
|
||||
(only valid for a single URL)
|
||||
--delete-temporary=false Preserve temporary files
|
||||
`)
|
||||
os.Exit(1)
|
||||
}
|
||||
|
||||
func main() {
|
||||
|
||||
ctx := context.Background()
|
||||
|
||||
cfg := config{}
|
||||
|
||||
flag.StringVar(&cfg.youtubeDl, "youtube-dl", "youtube-dl", "")
|
||||
flag.StringVar(&cfg.mkvmerge, "mkvmerge", "mkvmerge", "")
|
||||
flag.StringVar(&cfg.overrideOutput, "output", "", "")
|
||||
flag.BoolVar(&cfg.deleteTemporaries, "delete-temporary", true, "")
|
||||
flag.Usage = usage
|
||||
flag.Parse()
|
||||
|
||||
if len(flag.Args()) == 0 {
|
||||
usage() // n.b. calls os.Exit(1)
|
||||
}
|
||||
|
||||
if len(flag.Args()) > 1 && cfg.overrideOutput != "" {
|
||||
fmt.Fprintln(os.Stderr, "Can't use --output when supplying multiple URLs")
|
||||
os.Exit(1)
|
||||
}
|
||||
|
||||
for _, targetUrl := range flag.Args() {
|
||||
err := performDownload(ctx, &cfg, targetUrl)
|
||||
if err != nil {
|
||||
fmt.Fprintln(os.Stderr, err.Error())
|
||||
os.Exit(1)
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user