feat(cmd): add gonictranscode command

Author: sentriz

cmd/gonictranscode/gonictranscode.go

@@ -0,0 +1,67 @@
+//nolint:gochecknoglobals,gochecknoinits
+package main
+
+import (
+	"context"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"go.senan.xyz/gonic/countrw"
+	"go.senan.xyz/gonic/server/scanner/tags"
+	"go.senan.xyz/gonic/server/transcode"
+)
+
+var args = os.Args
+
+const (
+	bin = iota
+	prof
+	bitrate
+	seek
+	path
+	argc
+)
+
+func main() {
+	if len(args) != argc {
+		log.Fatalf("usage %s <profile> <bitrate kbps|0> <seek s|0> <path>", args[bin])
+	}
+
+	profile, ok := transcode.UserProfiles[args[prof]]
+	if !ok {
+		log.Fatalf("can't find profile %q in %s", prof, strings.Join(profileNames, ", "))
+	}
+
+	if bitrate, _ := strconv.Atoi(args[bitrate]); bitrate > 0 {
+		profile = transcode.WithBitrate(profile, transcode.BitRate(bitrate))
+	}
+	if seek, _ := strconv.Atoi(args[seek]); seek > 0 {
+		profile = transcode.WithSeek(profile, time.Duration(seek)*time.Second)
+	}
+
+	var tr tags.TagReader
+	trags, err := tr.Read(args[path])
+	if err != nil {
+		log.Fatalf("error reading tags: %v", err)
+	}
+
+	w := countrw.NewCountWriter(os.Stdout)
+	log.Printf("size guessed: %12dB", transcode.GuessExpectedSize(profile, time.Duration(trags.Length())*time.Second))
+	defer func() { log.Printf("size actual:  %12dB", w.Count()) }()
+
+	t := transcode.NewFFmpegTranscoder()
+	if err := t.Transcode(context.Background(), profile, args[path], w); err != nil {
+		log.Panicf("error transcoding: %v", err)
+	}
+}
+
+var profileNames []string
+
+func init() {
+	for name := range transcode.UserProfiles {
+		profileNames = append(profileNames, name)
+	}
+}