Add SSRC filter and NetEq accessor to NetEq simulator.

Bug: None
Change-Id: I6b3f9c564199d75adf5830a7d0f58aeb50674c39
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/345440
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Jakob Ivarsson‎ <jakobi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#42002}

api/BUILD.gn

@@ -962,6 +962,7 @@ rtc_library("neteq_simulator_api") {
     "test/neteq_simulator.cc",
     "test/neteq_simulator.h",
   ]
+  deps = [ "neteq:neteq_api" ]
 }
 
 rtc_source_set("function_view") {

api/test/neteq_simulator.h

@@ -16,6 +16,8 @@
 #include <map>
 #include <vector>
 
+#include "api/neteq/neteq.h"
+
 namespace webrtc {
 namespace test {
 
@@ -74,6 +76,9 @@ class NetEqSimulator {
 
   // Get the current state of NetEq.
   virtual NetEqState GetNetEqState() = 0;
+
+  // Get the underlying NetEq instance.
+  virtual NetEq* GetNetEq() = 0;
 };
 
 }  // namespace test

api/test/neteq_simulator_factory.cc

@@ -36,6 +36,7 @@ NetEqTestFactory::Config convertConfig(
   config.plot_scripts_basename = simulation_config.python_plot_filename;
   config.textlog = simulation_config.text_log_filename.has_value();
   config.textlog_filename = simulation_config.text_log_filename;
+  config.ssrc_filter = simulation_config.ssrc_filter;
   return config;
 }
 }  // namespace

api/test/neteq_simulator_factory.h

@@ -11,6 +11,7 @@
 #ifndef API_TEST_NETEQ_SIMULATOR_FACTORY_H_
 #define API_TEST_NETEQ_SIMULATOR_FACTORY_H_
 
+#include <cstdint>
 #include <memory>
 #include <string>
 
@@ -50,6 +51,8 @@ class NetEqSimulatorFactory {
     absl::optional<std::string> text_log_filename;
     // A custom NetEqFactory can be used.
     NetEqFactory* neteq_factory = nullptr;
+    // The SSRC to use for the simulation.
+    absl::optional<uint32_t> ssrc_filter;
   };
   std::unique_ptr<NetEqSimulator> CreateSimulatorFromFile(
       absl::string_view event_log_filename,

modules/audio_coding/neteq/tools/neteq_test.h

@@ -100,6 +100,7 @@ class NetEqTest : public NetEqSimulator {
 
   void SetNextAction(Action next_operation) override;
   NetEqState GetNetEqState() override;
+  NetEq* GetNetEq() override { return neteq_.get(); }
 
   // Returns the statistics from NetEq.
   NetEqNetworkStatistics SimulationStats();