Add ability to emulate degraded network in Call via field trial

This is especially useful in Chrome, allowing use to emulate network
conditions in incoming or outgoing media without the need for platform
specific tools or hacks. It also doesn't interfere with the rest of the
network traffic.

Also includes some refactorings.

Bug: webrtc:8910
Change-Id: I2656a2d4218acbe7f8ffd669de19a02275735438
Reviewed-on: https://webrtc-review.googlesource.com/33013
Commit-Queue: Erik Språng <sprang@webrtc.org>
Reviewed-by: Stefan Holmer <stefan@webrtc.org>
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22418}

1 files changed, 47 insertions, 0 deletions

diff --git a/call/BUILD.gn b/call/BUILD.gn
index b9a6dc1cad..e447d3765c 100644
--- a/call/BUILD.gn
+++ b/call/BUILD.gn
@@ -143,6 +143,8 @@ rtc_static_library("call") {
     "call.cc",
     "callfactory.cc",
     "callfactory.h",
+    "degraded_call.cc",
+    "degraded_call.h",
     "flexfec_receive_stream_impl.cc",
     "flexfec_receive_stream_impl.h",
   ]
@@ -155,6 +157,7 @@ rtc_static_library("call") {
   deps = [
     ":bitrate_allocator",
     ":call_interfaces",
+    ":fake_network",
     ":rtp_interfaces",
     ":rtp_receiver",
     ":rtp_sender",
@@ -184,6 +187,7 @@ rtc_static_library("call") {
     "../rtc_base:safe_minmax",
     "../rtc_base:sequenced_task_checker",
     "../system_wrappers",
+    "../system_wrappers:field_trial_api",
     "../system_wrappers:metrics_api",
     "../video",
   ]
@@ -213,6 +217,29 @@ rtc_source_set("video_stream_api") {
   ]
 }
 
+rtc_source_set("fake_network") {
+  sources = [
+    "fake_network_pipe.cc",
+    "fake_network_pipe.h",
+  ]
+  deps = [
+    ":call_interfaces",
+    "..:typedefs",
+    "..:webrtc_common",
+    "../api:transport_api",
+    "../modules:module_api",
+    "../modules/rtp_rtcp",
+    "../rtc_base:rtc_base_approved",
+    "../rtc_base:sequenced_task_checker",
+    "../system_wrappers",
+  ]
+
+  if (!build_with_chromium && is_clang) {
+    # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
+    suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
+  }
+}
+
 if (rtc_include_tests) {
   rtc_source_set("call_tests") {
     testonly = true
@@ -340,4 +367,24 @@ if (rtc_include_tests) {
       "//test:test_support",
     ]
   }
+
+  rtc_test("fake_network_unittests") {
+    deps = [
+      ":call_interfaces",
+      ":fake_network",
+      "../modules/rtp_rtcp",
+      "../rtc_base:rtc_base_approved",
+      "../system_wrappers",
+      "../test:test_common",
+      "../test:test_main",
+      "//testing/gtest",
+    ]
+    sources = [
+      "test/fake_network_pipe_unittest.cc",
+    ]
+    if (!build_with_chromium && is_clang) {
+      # Suppress warnings from the Chromium Clang plugin (bugs.webrtc.org/163).
+      suppressed_configs += [ "//build/config/clang:find_bad_constructs" ]
+    }
+  }
 }