Add a simple, safe gain PostProcessor.

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

 # Copyright 2015 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/buildflag_header.gni")
 import("//build/config/chromecast_build.gni")
 import("//chromecast/chromecast.gni")
 import("//media/media_options.gni")
 import("//testing/test.gni")
 
@@ skipping 46 matching lines @@
     "stream_mixer_alsa_input_impl.cc",
     "stream_mixer_alsa_input_impl.h",
     "volume_control.cc",
   ]
 
   libs = [ "asound" ]
 
   deps = [
     ":alsa_features",
     ":slew_volume",
+    ":volume_map",
     "//base",
     "//chromecast/base",
     "//chromecast/media/base",
     "//chromecast/media/cma/backend:null",
     "//chromecast/media/cma/base",
     "//chromecast/media/cma/decoder",
     "//chromecast/public/media",
     "//media",
     "//media:shared_memory_support",
   ]
 }
 
+source_set("volume_map") {
+  sources = [
+    "cast_audio_json.cc",
+    "cast_audio_json.h",
+    "volume_map.cc",
+    "volume_map.h",
+  ]
+  deps = [
+    "//base",
+    "//chromecast/base",
+  ]
+}
+
 source_set("slew_volume") {
   sources = [
     "slew_volume.cc",
     "slew_volume.h",
   ]
   deps = [
     "//base",
     "//media:shared_memory_support",
   ]
 }
@@ skipping 58 matching lines @@
     "//testing/gtest",
   ]
 }
 
 shared_library("libcast_governor_1.0") {
   deps = [
     ":governor",
   ]
 }
 
+shared_library("libcast_saturated_gain_1.0") {
+  deps = [
+    ":saturated_gain",
+  ]
+}
+
+test("libcast_saturated_gain_unittests") {

[alokp, 2017/06/30 17:15:35]

why do we have so many tests under a module. It would be preferable to have a
single cast_media_unittests so that it is easy to discover and run.

[bshaya, 2017/07/06 21:04:44]

Done.

+  sources = [
+    "post_processors/saturated_gain_unittest.cc",
+  ]
+  deps = [
+    ":post_processor_test_support",
+    ":saturated_gain",
+    "//base",
+    "//base/test:run_all_unittests",
+  ]
+}
+
 test("libcast_governor_unittests") {
   sources = [
     "post_processors/governor_unittest.cc",
   ]
   deps = [
     ":governor",
     ":post_processor_test_support",
     "//base",
     "//base/test:run_all_unittests",
     "//media",
     "//testing/gtest",
   ]
 }
 
 source_set("governor") {
   sources = [
     "post_processors/governor.cc",
     "post_processors/governor.h",
   ]
   deps = [
     ":slew_volume",
     "//base",
     "//chromecast/base",
     "//chromecast/public/media",
   ]
   public_configs = [ "//chromecast/public:public_config" ]
 }
 
+source_set("saturated_gain") {

[alokp, 2017/06/30 17:15:35]

why do you need this source_set? Can't the test directly depend on
libcast_saturated_gain_1.0?

[bshaya, 2017/07/06 21:04:44]

Done.

+  sources = [
+    "post_processors/saturated_gain.cc",
+    "post_processors/saturated_gain.h",
+  ]
+  deps = [
+    ":slew_volume",
+    ":volume_map",
+    "//base",
+    "//chromecast/base",
+    "//chromecast/public/media",
+  ]
+  public_configs = [ "//chromecast/public:public_config" ]
+}
+
 source_set("post_processor_test_support") {
   testonly = true
   sources = [
     "post_processors/post_processor_unittest.cc",
     "post_processors/post_processor_unittest.h",
   ]
   deps = [
     "//base",
     "//chromecast/public/media",
     "//testing/gtest",
   ]
 }