Add audio-only downloads

.dockerignore

@@ -2,3 +2,4 @@ data
 config
 go.sum
 *.mp4
+*.m4a

.gitignore

@@ -1,4 +1,5 @@
 config
 go.sum
 *.mp4
+*.m4a
 data

README.md

@@ -18,7 +18,8 @@ go run *.go
 ## Docker
 
 ```bash
-docker build -t server .
+docker build --build-arg GIT_SHA=$(git rev-parse HEAD) \
+  -t server .
 
 docker run --rm -it \
   -p 3000:8080 \

handlers.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"bytes"
-	"errors"
 	"fmt"
 	"net/http"
 	"os"
@@ -14,6 +13,7 @@ import (
 
 	"github.com/labstack/echo/v4"
 	"golang.org/x/crypto/bcrypt"
+	"gorm.io/gorm"
 )
 
 func registerHandler(c echo.Context) error {
@@ -89,22 +89,38 @@ func downloadHandler(c echo.Context) error {
 func downloadPostHandler(c echo.Context) error {
 	url := c.FormValue("url")
 	userID := c.Get("user_id").(uint)
+	vaStr := c.FormValue("color")
 
-	original := Original{URL: url, UserID: userID, Status: "pending"}
+	audioOnly := false
+	if vaStr == "audio" {
+		audioOnly = true
+	} else if vaStr == "audio-video" {
+		audioOnly = false
+	} else {
+		return c.Redirect(http.StatusSeeOther, "/download")
+	}
+
+	original := Original{
+		URL:    url,
+		UserID: userID,
+		Status: "pending",
+		Audio:  audioOnly,
+		Video:  !audioOnly,
+	}
 	db.Create(&original)
-	go startDownload(original.ID, url)
+	go startDownload(original.ID, url, audioOnly)
-
 	return c.Redirect(http.StatusSeeOther, "/videos")
 }
 
 type Meta struct {
 	title  string
+	artist string
 	ext    string
 }
 
-func getMeta(url string) (Meta, error) {
+func getYtdlpTitle(url string, args []string) (string, error) {
 	ytdlp := "yt-dlp"
-	args := []string{"--simulate", "--print", "%(title)s.%(ext)s", url}
+	args = append(args, "--simulate", "--print", "%(title)s", url)
 	fmt.Println(ytdlp, strings.Join(args, " "))
 	cmd := exec.Command(ytdlp, args...)
 
@@ -112,22 +128,73 @@ func getMeta(url string) (Meta, error) {
 	cmd.Stdout = &stdout
 	err := cmd.Run()
 	if err != nil {
-		fmt.Println("getTitle error:", err, stdout.String())
+		fmt.Println("getYtdlpTitle error:", err, stdout.String())
-		return Meta{}, err
+		return "", err
-	} else {
+	}
-		isDot := func(r rune) bool {
+	return strings.TrimSpace(stdout.String()), nil
-			return r == '.'
 }
 
-		fields := strings.FieldsFunc(strings.TrimSpace(stdout.String()), isDot)
+func getYtdlpArtist(url string, args []string) (string, error) {
-		if len(fields) < 2 {
+	ytdlp := "yt-dlp"
-			return Meta{}, errors.New("couldn't parse ytdlp output")
+	args = append(args, "--simulate", "--print", "%(uploader)s", url)
+	fmt.Println(ytdlp, strings.Join(args, " "))
+	cmd := exec.Command(ytdlp, args...)
+
+	var stdout bytes.Buffer
+	cmd.Stdout = &stdout
+	err := cmd.Run()
+	if err != nil {
+		fmt.Println("getYtdlpArtist error:", err, stdout.String())
+		return "", err
 	}
-		return Meta{
+	return strings.TrimSpace(stdout.String()), nil
-			title: strings.Join(fields[:len(fields)-1], "."),
-			ext:   fields[len(fields)-1],
-		}, nil
 }
+
+func getYtdlpExt(url string, args []string) (string, error) {
+	ytdlp := "yt-dlp"
+	args = append(args, "--simulate", "--print", "%(ext)s", url)
+	fmt.Println(ytdlp, strings.Join(args, " "))
+	cmd := exec.Command(ytdlp, args...)
+
+	var stdout bytes.Buffer
+	cmd.Stdout = &stdout
+	err := cmd.Run()
+	if err != nil {
+		fmt.Println("getYtdlpExt error:", err, stdout.String())
+		return "", err
+	}
+	return strings.TrimSpace(stdout.String()), nil
+}
+
+func getYtdlpMeta(url string, args []string) (Meta, error) {
+
+	meta := Meta{}
+	var err error
+
+	meta.title, err = getYtdlpTitle(url, args)
+	if err != nil {
+
+	}
+	meta.artist, err = getYtdlpArtist(url, args)
+	if err != nil {
+
+	}
+	meta.ext, err = getYtdlpExt(url, args)
+	if err != nil {
+
+	}
+
+	return meta, nil
+}
+
+func getYtdlpAudioMeta(url string) (Meta, error) {
+	args := []string{"-f", "bestaudio"}
+	return getYtdlpMeta(url, args)
+}
+
+func getYtdlpVideoMeta(url string) (Meta, error) {
+	args := []string{"-f", "bestvideo+bestaudio/best"}
+	return getYtdlpMeta(url, args)
 }
 
 // return the length in seconds of a video file at `path`
@@ -270,6 +337,10 @@ type VideoMeta struct {
 	fps    float64
 }
 
+type AudioMeta struct {
+	rate uint
+}
+
 func getVideoMeta(path string) (VideoMeta, error) {
 	w, err := getVideoWidth(path)
 	if err != nil {
@@ -290,27 +361,69 @@ func getVideoMeta(path string) (VideoMeta, error) {
 	}, nil
 }
 
-func processOriginal(originalID uint, videoFilename string, origMeta Meta) {
+func getAudioBitrate(path string) (uint, error) {
 
-	videoFilepath := filepath.Join(getDataDir(), videoFilename)
+	ffprobe := "ffprobe"
+	ffprobeArgs := []string{
+		"-v", "quiet",
+		"-select_streams", "a:0",
+		"-show_entries", "stream=bit_rate",
+		"-of", "default=noprint_wrappers=1:nokey=1",
+		path}
+
+	fmt.Println(ffprobe, strings.Join(ffprobeArgs, " "))
+	cmd := exec.Command(ffprobe, ffprobeArgs...)
+	var stdout bytes.Buffer
+	cmd.Stdout = &stdout
+	err := cmd.Run()
+	if err != nil {
+		fmt.Println("getAudioBitrate error:", err, stdout.String())
+		return 0, err
+	}
+	bitrateStr := strings.TrimSpace(stdout.String())
+	bitrate, err := strconv.ParseUint(bitrateStr, 10, 32)
+	if err != nil {
+		fmt.Println("getAudioBitrate error:", err)
+		return 0, err
+	}
+	return uint(bitrate), nil
+
+}
+
+func getAudioMeta(path string) (AudioMeta, error) {
+	rate, err := getAudioBitrate(path)
+	if err != nil {
+		return AudioMeta{}, err
+	}
+	return AudioMeta{
+		rate: rate,
+	}, nil
+}
+
+func processOriginal(originalID uint) {
+
+	// check if there is an original video
+	hasOriginalVideo := true
+	hasOriginalAudio := true
+	var video Video
+	var audio Audio
+	err := db.Where("source = ?", "original").Where("original_id = ?", originalID).First(&video).Error
+	if err == gorm.ErrRecordNotFound {
+		hasOriginalVideo = false
+	}
+	err = db.Where("source = ?", "original").Where("original_id = ?", originalID).First(&audio).Error
+	if err == gorm.ErrRecordNotFound {
+		hasOriginalAudio = false
+	}
+
+	if hasOriginalVideo {
+
+		videoFilepath := filepath.Join(getDataDir(), video.Filename)
 		_, err := os.Stat(videoFilepath)
 		if os.IsNotExist(err) {
 			fmt.Println("Skipping non-existant file for processOriginal")
 			return
 		}
-
-	// create video entry for original
-	video := Video{
-		OriginalID: originalID,
-		Filename:   videoFilename,
-		Source:     "original",
-		Type:       origMeta.ext,
-	}
-	fmt.Println("create Video", video)
-	if err := db.Create(&video).Error; err != nil {
-		fmt.Println(err)
-	}
-
 		videoMeta, err := getVideoMeta(videoFilepath)
 		if err != nil {
 			fmt.Println(err)
@@ -355,43 +468,124 @@ func processOriginal(originalID uint, videoFilename string, origMeta Meta) {
 				db.Create(&t)
 			}
 		}
+
+	} else if hasOriginalAudio {
+
+		audioFilepath := filepath.Join(getDataDir(), audio.Filename)
+		_, err := os.Stat(audioFilepath)
+		if os.IsNotExist(err) {
+			fmt.Println("Skipping non-existant audio file for processOriginal")
+			return
+		}
+		audioMeta, err := getAudioMeta(audioFilepath)
+		if err != nil {
+			fmt.Println(err)
+		} else {
+			fmt.Println(audioMeta)
+			db.Model(&Audio{}).Where("id = ?", audio.ID).Update("rate", fmt.Sprintf("%dk", audioMeta.rate/1000))
 		}
 
-func startDownload(originalID uint, videoURL string) {
+		size, err := getSize(audioFilepath)
+		if err == nil {
+			db.Model(&Audio{}).Where("id = ?", audio.ID).Update("size", humanSize(size))
+		}
+
+		// create audio transcodes
+		for _, bitrate := range []uint{64, 96, 128, 160, 192} {
+			t := Transcode{
+				SrcID:      audio.ID,
+				OriginalID: originalID,
+				SrcKind:    "audio",
+				DstKind:    "audio",
+				Rate:       bitrate,
+				TimeSubmit: time.Now(),
+				Status:     "pending",
+			}
+			db.Create(&t)
+		}
+
+	} else {
+		fmt.Println("No original video or audio found in processOriginal")
+	}
+
+}
+
+func startDownload(originalID uint, videoURL string, audioOnly bool) {
+	fmt.Println("startDownload audioOnly=", audioOnly)
 
 	// metadata phase
 	db.Model(&Original{}).Where("id = ?", originalID).Update("status", "metadata")
-	origMeta, err := getMeta(videoURL)
+	var origMeta Meta
+	var err error
+	if audioOnly {
+		origMeta, err = getYtdlpAudioMeta(videoURL)
+	} else {
+		origMeta, err = getYtdlpVideoMeta(videoURL)
+	}
 	if err != nil {
 		db.Model(&Original{}).Where("id = ?", originalID).Update("status", "failed")
 		return
 	}
 	fmt.Printf("original metadata %v\n", origMeta)
 	db.Model(&Original{}).Where("id = ?", originalID).Update("title", origMeta.title)
+	db.Model(&Original{}).Where("id = ?", originalID).Update("artist", origMeta.artist)
 
 	// download original
 	db.Model(&Original{}).Where("id = ?", originalID).Update("status", "downloading")
-	videoFilename := fmt.Sprintf("%d-%s.%s", originalID, origMeta.title, origMeta.ext)
+	dlFilename := fmt.Sprintf("%d-%s.%s", originalID, origMeta.title, origMeta.ext)
-	videoFilepath := filepath.Join(getDataDir(), videoFilename)
+	dlFilepath := filepath.Join(getDataDir(), dlFilename)
-	cmd := exec.Command("yt-dlp",
+
-		"-f", "bestvideo+bestaudio/best",
+	var args []string
-		"-o", videoFilepath,
+	if audioOnly {
-		videoURL)
+		args = []string{"-f", "bestaudio"}
+	} else {
+		args = []string{"-f", "bestvideo+bestaudio/best"}
+	}
+
+	ytdlp := "yt-dlp"
+	ytdlpArgs := append(args, "-o", dlFilepath, videoURL)
+
+	fmt.Println(ytdlp, strings.Join(ytdlpArgs, " "))
+	cmd := exec.Command(ytdlp, ytdlpArgs...)
 	err = cmd.Run()
 	if err != nil {
 		db.Model(&Original{}).Where("id = ?", originalID).Update("status", "failed")
 		return
 	}
-	db.Model(&Original{}).Where("id = ?", originalID).Update("status", "completed")
 
-	processOriginal(originalID, videoFilename, origMeta)
+	if audioOnly {
+		audio := Audio{
+			OriginalID: originalID,
+			Filename:   dlFilename,
+			Source:     "original",
+			Type:       origMeta.ext,
+		}
+		fmt.Println("create Audio", audio)
+		db.Create(&audio)
+	} else {
+		video := Video{
+			OriginalID: originalID,
+			Filename:   dlFilename,
+			Source:     "original",
+			Type:       origMeta.ext,
+		}
+		fmt.Println("create Video", video)
+		db.Create(&video)
+	}
+
+	db.Model(&Original{}).Where("id = ?", originalID).Update("status", "completed")
+	processOriginal(originalID)
 }
 
 func videosHandler(c echo.Context) error {
 	userID := c.Get("user_id").(uint)
 	var origs []Original
 	db.Where("user_id = ?", userID).Find(&origs)
-	return c.Render(http.StatusOK, "videos.html", map[string]interface{}{"videos": origs})
+	return c.Render(http.StatusOK, "videos.html",
+		map[string]interface{}{
+			"videos":   origs,
+			"build_id": getGitSHA(),
+		})
 }
 
 type VideoTemplate struct {
@@ -419,7 +613,7 @@ func videoHandler(c echo.Context) error {
 
 	dataDir := getDataDir()
 
-	// create remporary URLs
+	// create temporary URLs
 	var videoURLs []VideoTemplate
 	var audioURLs []AudioTemplate
 	for _, video := range videos {
@@ -443,6 +637,7 @@ func videoHandler(c echo.Context) error {
 			"videos":   videoURLs,
 			"audios":   audioURLs,
 			"dataDir":  dataDir,
+			"build_id": getGitSHA(),
 		})
 }
 
@@ -467,7 +662,8 @@ func videoRestartHandler(c echo.Context) error {
 
 	orig.Status = "pending"
 	db.Save(&orig)
-	go startDownload(uint(id), orig.URL)
+
+	go startDownload(uint(id), orig.URL, orig.Audio)
 
 	return c.Redirect(http.StatusSeeOther, "/videos")
 }

models.go

@@ -16,8 +16,10 @@ type Original struct {
 	UserID uint
 	URL    string
 	Title  string
-	Author string
+	Artist string
 	Status string // "pending", "metadata", "downloading", "completed", "failed", "cancelled"
+	Audio  bool   // video download requested
+	Video  bool   // audio download requested
 }
 
 type Video struct {
@@ -37,7 +39,7 @@ type Video struct {
 type Transcode struct {
 	gorm.Model
 	Status     string // "pending", "running", "failed"
-	SrcID      uint   // Video.ID of the source file
+	SrcID      uint   // Video.ID or Audio.ID of the source file
 	OriginalID uint   // Original.ID
 	SrcKind    string // "video", "audio"
 	DstKind    string // "video", "audio"
@@ -56,7 +58,8 @@ type Transcode struct {
 type Audio struct {
 	gorm.Model
 	OriginalID uint   // Original.ID
-	Rate       string
+	Source     string // "original", "transcode"
+	Rate       string // in kbps
 	Length     string
 	Size       string
 	Type       string

templates/download.html

@@ -11,6 +11,11 @@
     <h1>Download Video</h1>
     <form method="POST">
         <input type="url" name="url" placeholder="Video URL" required>
+        <input type="radio" id="audio-video" name="color" value="audio-video" checked>
+        <label for="audio-video">Audio/Video</label>
+        <input type="radio" id="audio-video" name="color" value="audio">
+        <label for="audio">Audio Only</label>
+
         <button type="submit">Download</button>
     </form>
     <a href="/videos">View Downloaded Videos</a>

templates/video.html

@@ -71,6 +71,10 @@
     </div>
     {{end}}
 
+    <div class="footer">
+        <div class="build-id">Build ID: {{.build_id}}</div>
+    </div>
+
 </body>
 
 </html>

templates/videos.html

@@ -31,6 +31,7 @@
         <tr>
             <th>Title</th>
             <th>URL</th>
+            <th>Type</th>
             <th>Status</th>
             <th>Actions</th>
         </tr>
@@ -44,6 +45,14 @@
                 {{end}}
             </td>
             <td><a href="{{.URL}}">{{.URL}}</a></td>
+            <td>
+                {{if .Audio}}
+                Audio
+                {{end}}
+                {{if .Video}}
+                Video
+                {{end}}
+            </td>
             <td>{{.Status}}</td>
             <td>
                 {{if eq .Status "completed"}}
@@ -68,6 +77,11 @@
     </table>
     <p><a href="/download">Download New Video</a></p>
     <p><a href="/logout">Logout</a></p>
+
+    <div class="footer">
+        <div class="build-id">Build ID: {{.build_id}}</div>
+    </div>
+
 </body>
 
 </html>

workers.go

@@ -141,6 +141,56 @@ func videoToAudio(transID uint, bitrate uint, videoFilepath string) {
 	db.Delete(&trans)
 }
 
+func audioToAudio(transID uint, bitrate uint, srcFilepath string) {
+
+	// determine destination path
+	dstFilename := uuid.Must(uuid.NewV7()).String()
+	dstFilename = fmt.Sprintf("%s.mp3", dstFilename)
+	dstFilepath := filepath.Join(getDataDir(), dstFilename)
+
+	// ensure destination directory
+	err := ensureDirFor(dstFilepath)
+	if err != nil {
+		fmt.Println("Error: couldn't create dir for ", dstFilepath, err)
+		db.Model(&Transcode{}).Where("id = ?", transID).Update("status", "failed")
+		return
+	}
+
+	ffmpeg := "ffmpeg"
+	ffmpegArgs := []string{"-i", srcFilepath, "-vn", "-acodec",
+		"mp3", "-b:a",
+		fmt.Sprintf("%dk", bitrate),
+		dstFilepath}
+	fmt.Println(ffmpeg, strings.Join(ffmpegArgs, " "))
+	cmd := exec.Command(ffmpeg, ffmpegArgs...)
+	db.Model(&Transcode{}).Where("id = ?", transID).Update("status", "running")
+	err = cmd.Run()
+	if err != nil {
+		fmt.Println("Error: convert to audio file", srcFilepath, "->", dstFilepath)
+		db.Model(&Transcode{}).Where("id = ?", transID).Update("status", "failed")
+		return
+	}
+
+	// look up original
+	var trans Transcode
+	db.First(&trans, "id = ?", transID)
+	var orig Original
+	db.First(&orig, "id = ?", trans.OriginalID)
+
+	// create audio record
+	audio := Audio{OriginalID: orig.ID, Filename: dstFilename, Rate: fmt.Sprintf("%dk", bitrate)}
+
+	fileSize, err := getSize(dstFilepath)
+	if err == nil {
+		audio.Size = humanSize(fileSize)
+	}
+
+	db.Create(&audio)
+
+	// complete transcode
+	db.Delete(&trans)
+}
+
 func transcodePending() {
 	fmt.Println("transcodePending...")
 
@@ -175,6 +225,17 @@ func transcodePending() {
 				fmt.Println("unexpected src/dst kinds for Transcode", trans)
 				db.Delete(&trans)
 			}
+		} else if trans.SrcKind == "audio" {
+
+			var srcAudio Audio
+			err = db.First(&srcAudio, "id = ?", trans.SrcID).Error
+			if err != nil {
+				fmt.Println("no such source audio for audio Transcode", trans)
+				db.Delete(&trans)
+				continue
+			}
+			srcFilepath := filepath.Join(getDataDir(), srcAudio.Filename)
+			audioToAudio(trans.ID, trans.Rate, srcFilepath)
 		} else {
 			fmt.Println("unexpected src kind for Transcode", trans)
 			db.Delete(&trans)