Suspend hardware clock during output replacement without resetting media

src/call/call_timeline.cpp

@@ -143,10 +143,19 @@ void CallTimeline::progress(uint64_t deviceEpoch, uint64_t position, int64_t atU
     while (output.count > 1 && output.front().first + output.front().count <= minimumPosition) output.pop();
 }
 
+/* Устройство меняется, но PCM/PTS, монотонная позиция и сетевой резерв сохраняются. */
+void CallTimeline::suspend_device(uint64_t deviceEpoch) {
+    if (deviceEpoch != epoch) return;
+    anchorReceived = -1;
+    DEBUG_INFO(DEBUG_CATEGORY_CALL, "audio clock device suspended epoch=%llu position=%llu written=%llu",
+        (unsigned long long)epoch, (unsigned long long)anchorPosition, (unsigned long long)written);
+}
+
 call_clock_snapshot CallTimeline::clock(int64_t nowUs) {
     call_clock_snapshot result{};
     result.epoch = epoch; result.written_samples = written; result.pts_us = lastPts; result.measured = measured;
-    if (outputFailed || deviceFailed || !haveAnchor || !output.count || nowUs < anchorReceived || nowUs - anchorReceived > 250000) return result;
+    if (outputFailed || deviceFailed || !haveAnchor || !output.count || anchorReceived < 0 ||
+        nowUs < anchorReceived || nowUs - anchorReceived > 250000) return result;
     uint64_t pending = anchorTime > nowUs ? (uint64_t)std::ceil((anchorTime - nowUs) / sampleUs) : 0;
     uint64_t position = pending > anchorPosition ? 0 : anchorPosition - pending;
     position = std::max(position, minimumPosition);

src/call/call_timeline.h

@@ -18,6 +18,7 @@ public:
     void read(unsigned samples);
     void silence(unsigned samples);
     void progress(uint64_t epoch, uint64_t position, int64_t at_us, int64_t received_us, bool measured);
+    void suspend_device(uint64_t epoch);
     call_clock_snapshot clock(int64_t now_us);
 private:
     struct Span {