diff --git a/lib/soundtouch-master/source/SoundTouch/TDStretch.cpp b/lib/soundtouch-master/source/SoundTouch/TDStretch.cpp
index 80c421ca..adfb67c2 100644
--- a/lib/soundtouch-master/source/SoundTouch/TDStretch.cpp
+++ b/lib/soundtouch-master/source/SoundTouch/TDStretch.cpp
@@ -210,6 +210,35 @@ void TDStretch::clear()
 {
     outputBuffer.clear();
     clearInput();
+    sourceInput = sourceOutput = sourceMid = 0;
+    sourceValid = sourceCallback != nullptr;
+    if (sourceCallback) sourceCallback(sourceContext, {SourceKind::Reset});
+}
+
+// uTun: метаданные принадлежат потребителю, SoundTouch не выделяет память для карты.
+void TDStretch::setSourceCallback(SourceCallback callback, void* context, unsigned offset)
+{
+    sourceCallback = callback;
+    sourceContext = context;
+    sourceOffset = offset;
+    sourceInput = sourceOutput = sourceMid = 0;
+    sourceValid = callback != nullptr;
+    if (callback) callback(context, {SourceKind::Reset});
+}
+
+void TDStretch::invalidateSource(SourceError reason)
+{
+    if (!sourceValid) return;
+    sourceValid = false;
+    sourceCallback(sourceContext, {SourceKind::Invalid, reason});
+}
+
+void TDStretch::emitSource(SourceKind kind, uint64_t first, uint64_t second, unsigned count)
+{
+    if (!sourceValid || !count) return;
+    sourceCallback(sourceContext, {kind, SourceError::None, sourceOutput,
+                                   first + sourceOffset, second + sourceOffset, count});
+    sourceOutput += count;
 }
 
 
@@ -645,6 +674,7 @@ void TDStretch::processSamples()
             // (that's in 'midBuffer')
             overlap(outputBuffer.ptrEnd((uint)overlapLength), inputBuffer.ptrBegin(), (uint)offset);
             outputBuffer.putSamples((uint)overlapLength);
+            emitSource(SourceKind::Mix, sourceMid, sourceInput + offset, (unsigned)overlapLength);
             offset += overlapLength;
         }
         else
@@ -683,6 +713,7 @@ void TDStretch::processSamples()
         // length of sequence
         temp = (seekWindowLength - 2 * overlapLength);
         outputBuffer.putSamples(inputBuffer.ptrBegin() + channels * offset, (uint)temp);
+        emitSource(SourceKind::Copy, sourceInput + offset, 0, (unsigned)temp);
 
         // Copies the end of the current sequence from 'inputBuffer' to
         // 'midBuffer' for being mixed with the beginning of the next
@@ -690,6 +721,7 @@ void TDStretch::processSamples()
         assert((offset + temp + overlapLength) <= (int)inputBuffer.numSamples());
         memcpy(pMidBuffer, inputBuffer.ptrBegin() + channels * (offset + temp),
             channels * sizeof(SAMPLETYPE) * overlapLength);
+        sourceMid = sourceInput + offset + temp;
 
         // Remove the processed samples from the input buffer. Update
         // the difference between integer & nominal skip step to 'skipFract'
@@ -697,7 +729,7 @@ void TDStretch::processSamples()
         skipFract += nominalSkip;   // real skip size
         ovlSkip = (int)skipFract;   // rounded to integer skip
         skipFract -= ovlSkip;       // maintain the fraction part, i.e. real vs. integer skip
-        inputBuffer.receiveSamples((uint)ovlSkip);
+        sourceInput += inputBuffer.receiveSamples((uint)ovlSkip);
     }
 }
 
diff --git a/lib/soundtouch-master/source/SoundTouch/TDStretch.h b/lib/soundtouch-master/source/SoundTouch/TDStretch.h
index 483dd536..b5efe6bd 100644
--- a/lib/soundtouch-master/source/SoundTouch/TDStretch.h
+++ b/lib/soundtouch-master/source/SoundTouch/TDStretch.h
@@ -41,6 +41,7 @@
 #include "STTypes.h"
 #include "RateTransposer.h"
 #include "FIFOSamplePipe.h"
+#include "SourceSpan.h"
 
 namespace soundtouch
 {
@@ -135,6 +136,13 @@ protected:
     FIFOSampleBuffer outputBuffer;
     FIFOSampleBuffer inputBuffer;
 
+    SourceCallback sourceCallback = nullptr;
+    void* sourceContext = nullptr;
+    bool sourceValid = false;
+    uint64_t sourceInput = 0, sourceOutput = 0, sourceMid = 0;
+    unsigned sourceOffset = 0;
+    void emitSource(SourceKind kind, uint64_t first, uint64_t second, unsigned count);
+
     void acceptNewOverlapLength(int newOverlapLength);
 
     virtual void clearCrossCorrState();
@@ -167,6 +175,10 @@ public:
     TDStretch();
     virtual ~TDStretch() override;
 
+    // Только SoundTouch: регистрация на пустом тракте, затем события из processSamples().
+    void setSourceCallback(SourceCallback callback, void* context, unsigned offset);
+    void invalidateSource(SourceError reason);
+
     /// Operator 'new' is overloaded so that it automatically creates a suitable instance
     /// depending on if we've a MMX/SSE/etc-capable CPU available or not.
     static void *operator new(size_t s);