feat: extracting audio from video

src-tauri/src/conversion/ffmpeg.rs

@@ -24,7 +24,12 @@ pub fn build_args(
         ));
     }
 
-    // 既存の変換はこれまでと同様 FFmpeg に任せる
+    if input_format.is_video()
+        && output_format.is_audio()
+    {
+        return Ok(build_video_to_audio_args(input_path, output_path, options));
+    }
+
     Ok(build_default_args(input_path, output_path, options))
 }
 
@@ -123,6 +128,23 @@ fn build_gif_to_video_args(
     args
 }
 
+fn build_video_to_audio_args(
+    input_path: &Path,
+    output_path: &Path,
+    options: &ConversionOptions, // 現時点では不使用だが、将来的にオーディオ変換オプションを追加するため引数として受け取る
+) -> Vec<String> {
+    let mut args = vec![
+        "-y".into(),
+        "-i".into(),
+        path_to_string(input_path),
+        "-vn".into(),
+    ];
+
+    args.push(path_to_string(output_path));
+
+    args
+}
+
 fn append_video_output_options(args: &mut Vec<String>, format: FileFormat) {
     match format {
         FileFormat::Mp4 => {

src-tauri/src/conversion/types.rs

@@ -80,6 +80,20 @@ impl FileFormat {
     pub fn is_video(self) -> bool {
         matches!(self, Self::Mp4 | Self::Webm | Self::Avi | Self::Mov)
     }
+    pub fn is_audio(self) -> bool {
+        matches!(
+            self,
+            Self::Mp3
+                | Self::M4a
+                | Self::Aac
+                | Self::Wav
+                | Self::Aiff
+                | Self::Flac
+                | Self::Wma
+                | Self::Ogg
+                | Self::Opus
+        )
+    }
 }
 
 #[derive(Debug, Clone, Deserialize, Default)]

src/App.tsx

@@ -133,7 +133,7 @@ function App() {
     }
 
     if (VIDEO_FORMATS.includes(sourceFormat as VideoFormat)) {
-      return [...VIDEO_FORMATS, "GIF"];
+      return [...VIDEO_FORMATS, "GIF", ...AUDIO_FORMATS];
     }
 
     if (AUDIO_FORMATS.includes(sourceFormat as AudioFormat)) {