Stream the waveform compute so large uploads no longer buffer the whole file (Wave 2 OOM)

DeepDrftAPI/Services/UnifiedReleaseService.cs

@@ -143,8 +143,9 @@ public class UnifiedReleaseService
             return Result.CreateFailResult(MixHasNoTrackMessage);
         }
 
-        var audio = await _trackContentService.GetAudioBinaryAsync(entryKey);
-        if (audio is null)
+        // Duration from the vault index metadata (no body load); its absence means no vault audio.
+        var duration = await _trackContentService.GetAudioDurationAsync(entryKey);
+        if (duration is null)
         {
             _logger.LogWarning("TriggerMixWaveform: no audio in vault for {EntryKey} (release {ReleaseId})", entryKey, releaseId);
             return Result.CreateFailResult(MixTrackNoAudioMessage);
@@ -152,10 +153,18 @@ public class UnifiedReleaseService
 
         // Duration-derived, constant-time-resolution capture (≈333 samples/sec) so long mixes are not
         // under-sampled by a fixed bucket count — see WaveformResolution / spec §F. Same per-track
-        // high-res datum every track now carries (phase-12 §5).
-        var computed = await _waveformProfileService.ComputeAndStoreHighResAsync(
-            audio.Buffer, entryKey, audio.Duration);
-        if (!computed)
+        // high-res datum every track now carries (phase-12 §5). Streamed from the vault in bounded
+        // chunks (Wave 2): a ~GB mix is never buffered whole. Tri-state — null = entry vanished after
+        // the metadata read; false = uncomputable / write failed.
+        var computed = await _waveformProfileService.ComputeAndStoreHighResStreamingAsync(
+            _ => _trackContentService.OpenAudioStreamAsync(entryKey), entryKey, duration.Value, ct);
+        if (computed is null)
+        {
+            _logger.LogWarning("TriggerMixWaveform: no audio in vault for {EntryKey} (release {ReleaseId})", entryKey, releaseId);
+            return Result.CreateFailResult(MixTrackNoAudioMessage);
+        }
+
+        if (computed is false)
         {
             _logger.LogError("TriggerMixWaveform: waveform computation/storage failed for {EntryKey}", entryKey);
             return Result.CreateFailResult("Failed to compute the Mix waveform.");