Implement runtime audio post-processing pipeline. See go/cast_audio.json

chromecast/media/cma/backend/alsa/BUILD.gn

Index: chromecast/media/cma/backend/alsa/BUILD.gn
diff --git a/chromecast/media/cma/backend/alsa/BUILD.gn b/chromecast/media/cma/backend/alsa/BUILD.gn
index 2838a6d342b2fdc4b5add9df7e3095025252951d..870bf3aea96e23bf88a4b9ee97f955e865655a9e 100644
--- a/chromecast/media/cma/backend/alsa/BUILD.gn
+++ b/chromecast/media/cma/backend/alsa/BUILD.gn
@@ -44,6 +44,10 @@ source_set("alsa_cma_backend") {
     "filter_group.h",
     "media_pipeline_backend_alsa.cc",
     "media_pipeline_backend_alsa.h",
+    "post_processing_pipeline.cc",
+    "post_processing_pipeline.h",
+    "post_processing_pipeline_parser.cc",
+    "post_processing_pipeline_parser.h",
     "stream_mixer_alsa.cc",
     "stream_mixer_alsa.h",
     "stream_mixer_alsa_input.cc",
@@ -57,7 +61,6 @@ source_set("alsa_cma_backend") {
 
   deps = [
     ":alsa_features",
-    ":audio_filter_includes",
     ":slew_volume",
     "//base",
     "//chromecast/base",
@@ -69,34 +72,6 @@ source_set("alsa_cma_backend") {
     "//media",
     "//media:shared_memory_support",
   ]
-
-  if (chromecast_branding != "google") {
-    deps += [ ":audio_filter_null" ]
-  } else {
-    deps += [ "//chromecast/internal/media/cma/backend/alsa:filter" ]
-  }
-}
-
-source_set("audio_filter_null") {
-  sources = [
-    "audio_filter_factory_default.cc",
-  ]
-
-  deps = [
-    ":audio_filter_includes",
-  ]
-}
-
-source_set("audio_filter_includes") {
-  sources = [
-    "audio_filter_factory.h",
-    "audio_filter_interface.h",
-  ]
-
-  deps = [
-    "//base",
-    "//media",
-  ]
 }
 
 source_set("slew_volume") {
@@ -106,7 +81,7 @@ source_set("slew_volume") {
   ]
   deps = [
     "//base",
-    "//media",
+    "//media:shared_memory_support",
   ]
 }
 
@@ -156,3 +131,16 @@ source_set("test_support") {
     "//testing/gmock",
   ]
 }
+
+shared_library("libcast_governor") {
+  sources = [
+    "post_processors/governor_shlib.cc",
+  ]
+
+  deps = [
+    ":slew_volume",
+    "//base",
+    "//chromecast/base",
+    "//chromecast/public/media",
+  ]
+}