Audio framework: support for audio pre processing

Audio effect framework is extended to suport effects on
output and input audio path.

AudioFlinger: Support for audio effects and effect chains is
moved from PlaybackThread class to ThreadBase class so that
RecordThread can manage effects.
Effects of type pre processing are allowed on record thread
only. When a pre processing is enabled, the effect interface handle is
passed down to the input stream so that the audio HAL can call the
process function. The record thread loop calls the effect chain process
function that will only manage the effect state and commands and skip the
process function.

AudioRecord: The audio session is allocated before calling getInput() into
audio policy serice so that the session is known before the input theead is
created and pre processings can be created on the correct session.

AudioPolicyService: default pre processing for a given input source are
loaded from audio_effects.conf file.
When an input is created, corresponding effects are created and enabled.

Change-Id: Id17119e0979b4dcf189b5c7957fec30dc3478790

4 files changed, 73 insertions, 7 deletions

diff --git a/media/libeffects/data/audio_effects.conf b/media/libeffects/data/audio_effects.conf
index e6a7b37..b8fa487 100644
--- a/media/libeffects/data/audio_effects.conf
+++ b/media/libeffects/data/audio_effects.conf
@@ -1,5 +1,10 @@
 # List of effect libraries to load. Each library element must contain a "path" element
 # giving the full path of the library .so file.
+#    libraries {
+#        <lib name> {
+#          path <lib path>
+#        }
+#    }
 libraries {
   bundle {
     path /system/lib/soundfx/libbundlewrapper.so
@@ -10,6 +15,9 @@ libraries {
   visualizer {
     path /system/lib/soundfx/libvisualizer.so
   }
+  pre_processing {
+    path /system/lib/soundfx/libaudiopreprocessing.so
+  }
 }
 
 # list of effects to load. Each effect element must contain a "library" and a "uuid" element.
@@ -17,6 +25,16 @@ libraries {
 # "libraries" element.
 # The name of the effect element is indicative, only the value of the "uuid" element
 # designates the effect.
+# The uuid is the implementation specific UUID as specified by the effect vendor. This is not the
+# generic effect type UUID.
+#    effects {
+#        <fx name> {
+#            library <lib name>
+#            uuid <effect uuid>
+#        }
+#        ...
+#    }
+
 effects {
   bassboost {
     library bundle
@@ -54,4 +72,55 @@ effects {
     library visualizer
     uuid d069d9e0-8329-11df-9168-0002a5d5c51b
   }
+  agc {
+    library pre_processing
+    uuid aa8130e0-66fc-11e0-bad0-0002a5d5c51b
+  }
+  aec {
+    library pre_processing
+    uuid bb392ec0-8d4d-11e0-a896-0002a5d5c51b
+  }
+  ns {
+    library pre_processing
+    uuid c06c8400-8e06-11e0-9cb6-0002a5d5c51b
+  }
 }
+# Audio preprocessor configurations.
+# The pre processor configuration consists in a list of elements each describing
+# pre processor settings for a given input source. Valid input source names are:
+# "mic", "camcorder", "voice_recognition", "voice_communication"
+# Each input source element contains a list of effects elements. The name of the effect
+# element must be the name of one of the effects in the "effects" list of the file.
+# Each effect element may optionally contain a list of parameters and their
+# default value to apply when the pre processor effect is created.
+# A parameter is defined by a "param" element and a "value" element. Each of these elements
+# consists in one or more elements specifying a type followed by a value.
+# The types defined are: "int", "short", "float", "bool" and "string"
+# When both "param" and "value" are a single int, a simple form is allowed where just
+# the param and value pair is present in the parameter description
+#    pre_processing {
+#        <input source name> {
+#            <fx name> {
+#                <param 1 name> {
+#                    param {
+#                        int|short|float|bool|string <value>
+#                        [ int|short|float|bool|string <value> ]
+#                        ...
+#                    }
+#                    value {
+#                        int|short|float|bool|string <value>
+#                        [ int|short|float|bool|string <value> ]
+#                        ...
+#                    }
+#                }
+#                <param 2 name > {<param> <value>}
+#                ...
+#            }
+#            ...
+#        }
+#        ...
+#    }
+
+#
+# TODO: add default audio pre processor configurations after debug and tuning phase
+#
diff --git a/media/libeffects/factory/Android.mk b/media/libeffects/factory/Android.mk
index 26265ae..2f2b974 100644
--- a/media/libeffects/factory/Android.mk
+++ b/media/libeffects/factory/Android.mk
@@ -14,4 +14,7 @@ LOCAL_MODULE:= libeffects
 
 LOCAL_SHARED_LIBRARIES += libdl
 
+LOCAL_C_INCLUDES := \
+    system/media/audio_effects/include
+
 include $(BUILD_SHARED_LIBRARY)
diff --git a/media/libeffects/factory/EffectsFactory.c b/media/libeffects/factory/EffectsFactory.c
index a9689bc..d333510 100644
--- a/media/libeffects/factory/EffectsFactory.c
+++ b/media/libeffects/factory/EffectsFactory.c
@@ -24,6 +24,7 @@
 
 #include <cutils/misc.h>
 #include <cutils/config_utils.h>
+#include <audio_effects/audio_effects_conf.h>
 
 static list_elem_t *gEffectList; // list of effect_entry_t: all currently created effects
 static list_elem_t *gLibraryList; // list of lib_entry_t: all currently loaded libraries
diff --git a/media/libeffects/factory/EffectsFactory.h b/media/libeffects/factory/EffectsFactory.h
index fcc0dba..c1d4319 100644
--- a/media/libeffects/factory/EffectsFactory.h
+++ b/media/libeffects/factory/EffectsFactory.h
@@ -26,13 +26,6 @@
 extern "C" {
 #endif
 
-#define AUDIO_EFFECT_DEFAULT_CONFIG_FILE "/system/etc/audio_effects.conf"
-#define AUDIO_EFFECT_VENDOR_CONFIG_FILE "/vendor/etc/audio_effects.conf"
-#define EFFECTS_TAG "effects"
-#define LIBRARIES_TAG "libraries"
-#define PATH_TAG "path"
-#define LIBRARY_TAG "library"
-#define UUID_TAG "uuid"
 
 typedef struct list_elem_s {
     void *object;