[fix] load_audio: fall back to soundfile when torchcodec fails on WAV with trailing metadata (#24185)

python/sglang/srt/utils/common.py

@@ -782,6 +782,7 @@ def load_audio(
     if _BACKEND == "torchcodec":
         from torchcodec.decoders import AudioDecoder
 
+        try:
             decoder = AudioDecoder(
                 source,
                 sample_rate=sr,
@@ -791,8 +792,14 @@ def load_audio(
             if mono:
                 return samples.data.squeeze(0).numpy()
             return samples.data.T.numpy()
+        except Exception as e:
+            # torchcodec's bytes-buffer IO can fail on WAV files that carry
+            # large trailing metadata chunks. Fall back to soundfile, which reads the PCM payload directly.
+            logger.warning(
+                f"torchcodec AudioDecoder failed ({e}); falling back to soundfile + torchaudio."
+            )
 
-    # Fallback: soundfile + torchaudio (ARM / no FFmpeg)
+    # Fallback: soundfile + torchaudio (ARM / no FFmpeg / torchcodec failure)
     import soundfile as sf
     import torch
     import torchaudio