Gap 13: BWF/INFO metadata cho WAV export — wav_bwf.patch_bwf_metadata chen bext + LIST/INFO (INAM/IART/ISRC/ICMT) truoc data chunk, giu nguyen PCM bits; render_project(metadata=) + RenderRequest.metadata + cloud render task; ExportModal Title/Artist/ISRC; test_66 (178 passed)

app/core/render_engine.py

@@ -839,7 +839,9 @@ class PythonRenderEngine:
     def render_project(self, project_json: dict, output_filepath: str,
                        bit_depth: int = 32, out_sample_rate: int = 0,
                        dither: bool = False, normalize: bool = False,
-                       normalize_target: str = "-1dbtp"):
+                       normalize_target: str = "-1dbtp",
+                       metadata: dict = None):
+        # Gap 13: BWF/INFO metadata — tham số phụ, không đổi hành vi cũ khi None.
         with RENDER_LOCK:
             bpm = project_json["metadata"]["bpm"]
             time_sig_num = project_json["metadata"].get("time_signature_numerator", 4)
@@ -963,4 +965,12 @@ class PythonRenderEngine:
                          out_sr, subtype="PCM_24")
             else:
                 sf.write(output_filepath, master_buffer.T, out_sr, subtype="FLOAT")
+            # Gap 13: BWF/INFO chunks (bext + LIST/INFO title/artist/ISRC) —
+            # chen sau khi ghi PCM, loi metadata khong lam hong file audio.
+            if metadata:
+                try:
+                    from app.core.wav_bwf import patch_bwf_metadata
+                    patch_bwf_metadata(output_filepath, metadata)
+                except Exception as e:
+                    logger.warning("[RenderEngine] BWF metadata skipped: %s", e)
             return output_filepath