forked from cgvr/DeltaVR
363 lines
12 KiB
C#
363 lines
12 KiB
C#
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using System;
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using System.Runtime.InteropServices;
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using UnityEngine;
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using FMOD;
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using FMODUnity;
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using Whisper; // WhisperManager, WhisperStream, WhisperResult
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using Whisper.Utils;
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using Debug = UnityEngine.Debug; // AudioChunk
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/// <summary>
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/// FMOD mic is initialized once (Start) and runs continuously in a ring buffer.
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/// Whisper stream is created when ActivateRecording() is called and disposed on DeactivateRecording().
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/// Optional loopback can be paused/resumed instead of starting/stopping to avoid stalls.
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/// </summary>
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public class FMODWhisperBridge : MonoBehaviour
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{
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[Header("Whisper")]
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[SerializeField] private WhisperManager whisper; // assign in Inspector
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[SerializeField] private bool useVadInStream = true; // let WhisperStream do VAD or not
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[Header("FMOD capture")]
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[Tooltip("Recording device index (0 = default)")]
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public int recordDriverId = 0;
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[Tooltip("Set 48000 on Quest; falls back to device rate automatically")]
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public int desiredSampleRate = 48000;
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[Tooltip("Mono recommended for Whisper")]
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public int channels = 1;
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[Range(1, 10)] public int bufferLengthSec = 5;
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[Header("Loopback (monitor your voice)")]
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public bool playLoopback = true;
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[Tooltip("If true, loopback plays only while active; otherwise it’s always on.")]
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public bool loopbackOnlyWhenActive = true;
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[Range(0f, 2f)] public float loopbackVolume = 1.0f;
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public delegate void OnWhisperSegmentUpdatedDelegate(string result);
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public event OnWhisperSegmentUpdatedDelegate OnWhisperSegmentUpdated;
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public delegate void OnWhisperSegmentFinishedDelegate(string result);
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public event OnWhisperSegmentFinishedDelegate OnWhisperSegmentFinished;
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// FMOD
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private FMOD.System _core;
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private Sound _recSound;
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private Channel _playChannel;
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private ChannelGroup _masterGroup;
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private uint _soundPcmLength; // in samples
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private int _nativeRate;
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private int _nativeChannels;
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// ring-buffer tracking
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private uint _lastRecordPos = 0;
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// Whisper
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private WhisperStream _stream;
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private bool _streamStarted;
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// temp conversion buffer
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private float[] _floatTmp = new float[0];
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private short[] _shortOverlay;
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// activation flag
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private bool isRecordingActivated = false;
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private void Awake()
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{
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if (!whisper) whisper = FindObjectOfType<WhisperManager>();
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_core = RuntimeManager.CoreSystem; // FMOD core system
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}
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private async void Start()
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{
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// -------------- FMOD initialize ONCE --------------
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// Query device info
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string name;
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Guid guid;
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SPEAKERMODE sm;
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int smChannels;
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DRIVER_STATE driverState;
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var res = _core.getRecordDriverInfo(
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recordDriverId,
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out name, 256,
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out guid,
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out _nativeRate,
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out sm,
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out smChannels,
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out driverState
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);
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if (res != RESULT.OK)
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{
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Debug.LogError($"[FMOD→Whisper] getRecordDriverInfo failed: {res}");
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return;
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}
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_nativeChannels = channels > 0 ? channels : smChannels;
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int rate = (_nativeRate > 0) ? _nativeRate : desiredSampleRate;
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Debug.Log($"[FMOD→Whisper] Using input device #{recordDriverId}: \"{name}\" rate={rate} ch={_nativeChannels}");
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// Build user sound (ring buffer) — multiple seconds
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CREATESOUNDEXINFO ex = new CREATESOUNDEXINFO
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{
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cbsize = Marshal.SizeOf(typeof(CREATESOUNDEXINFO)),
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numchannels = _nativeChannels,
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defaultfrequency = rate,
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format = SOUND_FORMAT.PCM16,
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length = (uint)(rate * _nativeChannels * sizeof(short) * bufferLengthSec)
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};
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res = _core.createSound("", MODE.OPENUSER | MODE.LOOP_NORMAL | MODE.CREATESAMPLE, ref ex, out _recSound);
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if (res != RESULT.OK)
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{
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Debug.LogError($"[FMOD→Whisper] createSound failed: {res}");
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return;
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}
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_recSound.getLength(out _soundPcmLength, TIMEUNIT.PCM);
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// Start recording (looping)
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res = _core.recordStart(recordDriverId, _recSound, true);
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if (res != RESULT.OK)
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{
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Debug.LogError($"[FMOD→Whisper] recordStart failed: {res}");
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_recSound.release();
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_recSound.clearHandle();
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return;
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}
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// Initialize record position to avoid a huge first delta
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_core.getRecordPosition(recordDriverId, out _lastRecordPos);
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Debug.Log("[FMOD→Whisper] Recording started.");
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// Loopback channel (optional). Start once; pause when inactive if desired.
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_core.getMasterChannelGroup(out _masterGroup);
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if (playLoopback)
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{
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res = _core.playSound(_recSound, _masterGroup, false, out _playChannel);
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if (res == RESULT.OK && _playChannel.hasHandle())
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{
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_playChannel.setMode(MODE._2D);
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_playChannel.setVolume(loopbackVolume);
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if (loopbackOnlyWhenActive) _playChannel.setPaused(true); // keep muted until Activate
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Debug.Log("[FMOD→Whisper] Loopback playback ready.");
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}
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else
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{
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Debug.LogWarning($"[FMOD→Whisper] playSound failed or channel invalid: {res}");
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}
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}
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// No Whisper stream here. It will be created on ActivateRecording().
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await System.Threading.Tasks.Task.Yield();
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}
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/// <summary>
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/// Creates a fresh Whisper stream and starts feeding audio (FMOD already recording).
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/// </summary>
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public async void ActivateRecording()
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{
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if (isRecordingActivated)
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{
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Debug.Log("[FMOD→Whisper] ActivateRecording ignored (already active).");
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return;
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}
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if (!_recSound.hasHandle())
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{
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Debug.LogError("[FMOD→Whisper] FMOD not initialized or recording not running.");
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return;
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}
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int rate = (_nativeRate > 0) ? _nativeRate : desiredSampleRate;
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try
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{
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_stream = await whisper.CreateStream(rate, _nativeChannels);
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}
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catch (Exception e)
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{
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Debug.LogError($"[FMOD→Whisper] CreateStream exception: {e}");
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_stream = null;
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_streamStarted = false;
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return;
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}
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// Wire events
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_stream.OnSegmentUpdated += (seg) =>
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{
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if (IsSpeechMeaningful(seg.Result))
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OnWhisperSegmentUpdated?.Invoke(seg.Result);
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};
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_stream.OnSegmentFinished += (seg) =>
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{
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if (IsSpeechMeaningful(seg.Result))
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OnWhisperSegmentFinished?.Invoke(seg.Result);
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};
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whisper.useVad = useVadInStream;
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_stream.StartStream();
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_streamStarted = true;
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// Unpause loopback if it's meant to play only while active
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if (playLoopback && loopbackOnlyWhenActive && _playChannel.hasHandle())
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_playChannel.setPaused(false);
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// Prepare temp arrays roughly 100ms of audio
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EnsureTmpCapacity((rate / 10) * _nativeChannels);
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isRecordingActivated = true;
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Debug.Log("[FMOD→Whisper] Stream activated (Whisper started; FMOD was already recording).");
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}
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/// <summary>
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/// Stops and disposes the Whisper stream only. FMOD keeps recording.
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/// </summary>
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public void DeactivateRecording()
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{
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if (!isRecordingActivated && !_streamStarted)
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return;
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isRecordingActivated = false;
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// Pause loopback if it should only be active during recording
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if (playLoopback && loopbackOnlyWhenActive && _playChannel.hasHandle())
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_playChannel.setPaused(true);
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// Tear down Whisper stream
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if (_streamStarted)
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{
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try { _stream.StopStream(); } catch { /* ignore */ }
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_streamStarted = false;
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}
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_stream = null;
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Debug.Log("[FMOD→Whisper] Stream deactivated (Whisper stopped; FMOD still recording).");
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}
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private void Update()
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{
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// Always tick FMOD
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if (_core.handle != IntPtr.Zero) _core.update();
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if (!_recSound.hasHandle()) return;
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// Compute how many samples recorded since last frame.
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uint recPos;
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_core.getRecordPosition(recordDriverId, out recPos);
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uint deltaSamples = (recPos >= _lastRecordPos)
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? (recPos - _lastRecordPos)
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: (recPos + _soundPcmLength - _lastRecordPos);
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if (deltaSamples == 0)
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{
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// Even if 0, keep last pos
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_lastRecordPos = recPos;
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return;
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}
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// If not active, we *still* advance the ring (so we don't backlog data),
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// but we *don't* push chunks to Whisper.
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bool shouldFeed = isRecordingActivated && _streamStarted && _stream != null;
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// Calculate byte range to lock (16-bit)
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uint bytesToRead = deltaSamples * (uint)_nativeChannels * 2; // 2 bytes per sample
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uint startBytes = _lastRecordPos * (uint)_nativeChannels * 2;
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IntPtr p1, p2;
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uint len1, len2;
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var r = _recSound.@lock(startBytes, bytesToRead, out p1, out p2, out len1, out len2);
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if (r != RESULT.OK)
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{
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// If lock fails, still advance last position to avoid spin
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_lastRecordPos = recPos;
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return;
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}
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try
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{
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if (shouldFeed)
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{
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if (len1 > 0) CopyPcm16ToFloatAndFeed(p1, len1);
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if (len2 > 0) CopyPcm16ToFloatAndFeed(p2, len2);
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}
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// else: just discard; we’re only keeping the ring fresh.
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}
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finally
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{
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_recSound.unlock(p1, p2, len1, len2);
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}
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_lastRecordPos = recPos;
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}
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private bool IsSpeechMeaningful(string userText)
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{
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return !string.IsNullOrEmpty(userText)
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&& !userText.Contains("BLANK_AUDIO")
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&& !userText.Trim().Equals("[ Silence ]");
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}
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private void CopyPcm16ToFloatAndFeed(IntPtr src, uint byteLen)
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{
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int samples = (int)(byteLen / 2); // 2 bytes per sample
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EnsureTmpCapacity(samples);
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EnsureShortOverlay(samples, out short[] sBuf);
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Marshal.Copy(src, sBuf, 0, samples);
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// Convert to float [-1..1] (no downmix change from your original)
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for (int i = 0; i < samples; i++)
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{
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_floatTmp[i] = Mathf.Clamp(sBuf[i] / 32768f, -1f, 1f);
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}
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// TODO (optional): downmix to mono and/or run a light gate before feeding.
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// For now we keep your original behavior:
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var chunk = new AudioChunk
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{
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Data = _floatTmp.AsSpan(0, samples).ToArray(),
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Frequency = (_nativeRate > 0) ? _nativeRate : desiredSampleRate,
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Channels = _nativeChannels,
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IsVoiceDetected = true
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};
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_stream.AddToStream(chunk);
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}
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private void EnsureShortOverlay(int samples, out short[] buf)
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{
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if (_shortOverlay == null || _shortOverlay.Length < samples)
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_shortOverlay = new short[Mathf.NextPowerOfTwo(samples)];
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buf = _shortOverlay;
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}
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private void EnsureTmpCapacity(int samples)
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{
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if (_floatTmp == null || _floatTmp.Length < samples)
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_floatTmp = new float[Mathf.NextPowerOfTwo(samples)];
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}
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private void OnDisable()
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{
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// Stop Whisper (if active)
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DeactivateRecording();
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// Stop/purge FMOD resources (since object is going away)
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if (_playChannel.hasHandle())
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{
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try { _playChannel.stop(); } catch { /* ignore */ }
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_playChannel.clearHandle();
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}
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if (_recSound.hasHandle())
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{
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try { _core.recordStop(recordDriverId); } catch { /* ignore */ }
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try { _recSound.release(); } catch { /* ignore */ }
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_recSound.clearHandle();
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}
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}
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}
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