From 3af2e487b91b06a6d22eeecc9947c6376ce23fa8 Mon Sep 17 00:00:00 2001
From: York <goog10216922@gmail.com>
Date: Sun, 2 Nov 2025 14:01:40 +0800
Subject: [PATCH] add option to skip converting lossy sources to lossless

---
 config.yaml              |  3 +++
 main.go                  | 13 +++++++++----
 utils/structs/structs.go |  1 +
 3 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/config.yaml b/config.yaml
index f748af7..a685da0 100644
--- a/config.yaml
+++ b/config.yaml
@@ -57,3 +57,6 @@ convert-keep-original: false       # Keep original file after successful convers
 convert-skip-if-source-matches: true  # If already in target format, skip
 ffmpeg-path: "ffmpeg"             # Override if ffmpeg is not in PATH
 convert-extra-args: ""            # Additional raw args appended (advanced)
+# Conversion warnings and behavior
+convert-warn-lossy-to-lossless: true # If true, print a warning when converting a detected lossy source to a lossless container
+convert-skip-lossy-to-lossless: true # If true, skip converting detected lossy sources to lossless target formats (flac/wav)
diff --git a/main.go b/main.go
index 1f36f5c..34db15f 100644
--- a/main.go
+++ b/main.go
@@ -707,10 +707,15 @@ func convertIfNeeded(track *task.Track) {
 	outBase := strings.TrimSuffix(srcPath, ext)
 	outPath := outBase + "." + targetFmt
 
-	// Warn about lossy -> lossless
-	if Config.ConvertWarnLossyToLossless && (targetFmt == "flac" || targetFmt == "wav") &&
-		isLossySource(ext, track.Codec) {
-		fmt.Println("Warning: Converting lossy source to lossless container will not improve quality.")
+	// Handle lossy -> lossless cases: optionally skip or warn
+	if (targetFmt == "flac" || targetFmt == "wav") && isLossySource(ext, track.Codec) {
+		if Config.ConvertSkipLossyToLossless {
+			fmt.Println("Skipping conversion: source appears lossy and target is lossless; configured to skip.")
+			return
+		}
+		if Config.ConvertWarnLossyToLossless {
+			fmt.Println("Warning: Converting lossy source to lossless container will not improve quality.")
+		}
 	}
 
 	if _, err := exec.LookPath(Config.FFmpegPath); err != nil {
diff --git a/utils/structs/structs.go b/utils/structs/structs.go
index 168f391..fe1bdb9 100644
--- a/utils/structs/structs.go
+++ b/utils/structs/structs.go
@@ -45,6 +45,7 @@ type ConfigSet struct {
 	FFmpegPath                 string `yaml:"ffmpeg-path"`
 	ConvertExtraArgs           string `yaml:"convert-extra-args"`
 	ConvertWarnLossyToLossless bool   `yaml:"convert-warn-lossy-to-lossless"`
+	ConvertSkipLossyToLossless bool   `yaml:"convert-skip-lossy-to-lossless"`
 }
 
 type Counter struct {