fix #78: skip parsing cover art if image is unsupported

cmd/um/main.go

@@ -428,7 +428,7 @@ func (p *processor) process(inputFile string, allDec []common.DecoderFactory) er
 		ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
 		defer cancel()
 
-		if err := ffmpeg.UpdateMeta(ctx, outPath, params); err != nil {
+		if err := ffmpeg.UpdateMeta(ctx, outPath, params, logger); err != nil {
 			return err
 		}
 	}

internal/ffmpeg/ffmpeg.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"fmt"
+	"go.uber.org/zap"
 	"io"
 	"os"
 	"os/exec"
@@ -43,9 +44,9 @@ type UpdateMetadataParams struct {
 	AlbumArtExt string // required if AlbumArt is not nil
 }
 
-func UpdateMeta(ctx context.Context, outPath string, params *UpdateMetadataParams) error {
+func UpdateMeta(ctx context.Context, outPath string, params *UpdateMetadataParams, logger *zap.Logger) error {
 	if params.AudioExt == ".flac" {
-		return updateMetaFlac(ctx, outPath, params)
+		return updateMetaFlac(ctx, outPath, params, logger.With(zap.String("module", "updateMetaFlac")))
 	} else {
 		return updateMetaFFmpeg(ctx, outPath, params)
 	}

internal/ffmpeg/meta_flac.go

@@ -2,6 +2,7 @@ package ffmpeg
 
 import (
 	"context"
+	"go.uber.org/zap"
 	"mime"
 	"strings"
 
@@ -11,7 +12,7 @@ import (
 	"golang.org/x/exp/slices"
 )
 
-func updateMetaFlac(_ context.Context, outPath string, m *UpdateMetadataParams) error {
+func updateMetaFlac(_ context.Context, outPath string, m *UpdateMetadataParams, logger *zap.Logger) error {
 	f, err := flac.ParseFile(m.Audio)
 	if err != nil {
 		return err
@@ -62,27 +63,30 @@ func updateMetaFlac(_ context.Context, outPath string, m *UpdateMetadataParams)
 	}
 
 	if m.AlbumArt != nil {
-
+		coverMime := mime.TypeByExtension(m.AlbumArtExt)
+		logger.Debug("cover image mime detect", zap.String("mime", coverMime))
 		cover, err := flacpicture.NewFromImageData(
 			flacpicture.PictureTypeFrontCover,
 			"Front cover",
 			m.AlbumArt,
-			mime.TypeByExtension(m.AlbumArtExt),
+			coverMime,
 		)
-		if err != nil {
-			return err
-		}
-		coverBlock := cover.Marshal()
-		f.Meta = append(f.Meta, &coverBlock)
 
-		// add / replace flac cover
+		if err != nil {
-		coverIdx := slices.IndexFunc(f.Meta, func(b *flac.MetaDataBlock) bool {
+			logger.Warn("failed to create flac cover", zap.Error(err))
-			return b.Type == flac.Picture
-		})
-		if coverIdx < 0 {
-			f.Meta = append(f.Meta, &coverBlock)
 		} else {
-			f.Meta[coverIdx] = &coverBlock
+			coverBlock := cover.Marshal()
+			f.Meta = append(f.Meta, &coverBlock)
+
+			// add / replace flac cover
+			coverIdx := slices.IndexFunc(f.Meta, func(b *flac.MetaDataBlock) bool {
+				return b.Type == flac.Picture
+			})
+			if coverIdx < 0 {
+				f.Meta = append(f.Meta, &coverBlock)
+			} else {
+				f.Meta[coverIdx] = &coverBlock
+			}
 		}
 	}