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

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 26 matching lines @@
     "alsa_volume_control.cc",
     "alsa_volume_control.h",
     "alsa_wrapper.cc",
     "alsa_wrapper.h",
     "audio_decoder_alsa.cc",
     "audio_decoder_alsa.h",
     "filter_group.cc",
     "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",
     "stream_mixer_alsa_input.h",
     "stream_mixer_alsa_input_impl.cc",
     "stream_mixer_alsa_input_impl.h",
     "volume_control.cc",
   ]
 
   libs = [ "asound" ]
 
   deps = [
     ":alsa_features",
-    ":audio_filter_includes",
     ":slew_volume",
     "//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",
   ]
-
-  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") {
   sources = [
     "slew_volume.cc",
     "slew_volume.h",
   ]
   deps = [
     "//base",
-    "//media",

[kmackay, 2017/03/24 22:15:54]

//media is still needed for eg media/audio/audio_device_description.h

[bshaya, 2017/03/24 22:55:49]

SlewVolume does not depend on audio_deivce_description.h.

alsa_cma_backend still pulls in //media.

(Including //media in this target made the resulting .so 7M)

+    "//media:shared_memory_support",
   ]
 }
 
 alsa_controls_volume = !enable_assistant
 
 buildflag_header("alsa_features") {
   header = "alsa_features.h"
 
   flags = [
     "ALSA_MONOTONIC_RAW_TSTAMPS=$use_alsa_monotonic_raw_tstamps",
@@ skipping 29 matching lines @@
   public_deps = [
     ":alsa_cma_backend",
   ]
 
   deps = [
     "//base",
     "//media",
     "//testing/gmock",
   ]
 }
+
+shared_library("libcast_governor") {
+  sources = [
+    "post_processors/governor_shlib.cc",
+  ]
+
+  deps = [
+    ":slew_volume",
+    "//base",
+    "//chromecast/base",
+    "//chromecast/public/media",
+  ]
+}