Implement RTCInboundRTPStreamStats.JitterBufferMinimumDelay

This metric was recently added to the standard (see https://w3c.github.io/webrtc-stats/#dom-rtcinboundrtpstreamstats-jitterbufferminimumdelay). This CL implements it for audio streams.

Bug: webrtc:14141
Change-Id: I79d918639cd12361ebbc28c2be41549e33fa7e2a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/262770
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Reviewed-by: Jakob Ivarsson‎ <jakobi@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Commit-Queue: Ivo Creusen <ivoc@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#37567}

api/neteq/neteq.h

@@ -67,6 +67,7 @@ struct NetEqLifetimeStatistics {
   uint64_t jitter_buffer_delay_ms = 0;
   uint64_t jitter_buffer_emitted_count = 0;
   uint64_t jitter_buffer_target_delay_ms = 0;
+  uint64_t jitter_buffer_minimum_delay_ms = 0;
   uint64_t inserted_samples_for_deceleration = 0;
   uint64_t removed_samples_for_acceleration = 0;
   uint64_t silent_concealed_samples = 0;

api/neteq/neteq_controller.h

@@ -163,6 +163,12 @@ class NetEqController {
   // Returns the target buffer level in ms.
   virtual int TargetLevelMs() const = 0;
 
+  // Returns the target buffer level in ms as it would be if no minimum or
+  // maximum delay was set.
+  // TODO(bugs.webrtc.org/14270): Make pure virtual once all implementations are
+  // updated.
+  virtual int UnlimitedTargetLevelMs() const { return 0; }
+
   // Notify the NetEqController that a packet has arrived. Returns the relative
   // arrival delay, if it can be computed.
   virtual absl::optional<int> PacketArrived(int fs_hz,
@@ -170,7 +176,7 @@ class NetEqController {
                                             const PacketArrivedInfo& info) = 0;
 
   // Notify the NetEqController that we are currently in muted state.
-  // TODO(ivoc): Make pure virtual when downstream is updated.
+  // TODO(bugs.webrtc.org/14270): Make pure virtual when downstream is updated.
   virtual void NotifyMutedState() {}
 
   // Returns true if a peak was found.

api/stats/rtcstats_objects.h

@@ -453,6 +453,7 @@ class RTC_EXPORT RTCInboundRTPStreamStats final
   RTCStatsMember<double> last_packet_received_timestamp;
   RTCStatsMember<double> jitter_buffer_delay;
   RTCStatsMember<double> jitter_buffer_target_delay;
+  RTCStatsMember<double> jitter_buffer_minimum_delay;
   RTCStatsMember<uint64_t> jitter_buffer_emitted_count;
   RTCStatsMember<uint64_t> total_samples_received;
   RTCStatsMember<uint64_t> concealed_samples;