Issue 2667801: [Audio Effect Framework] AudioFlinger, AudioMixer AudioTrack modifications.

First drop of audio framework modifications for audio effects support.

- AudioTrack/AudioRecord:
Added support for auxiliary effects in AudioTrack
Added support for audio sessions
Fixed left right channel inversion in setVolume()

- IAudioFlinger:
Added interface methods for effect enumeraiton and instantiation
Added support for audio sessions.

- IAudioTrack:
Added method to attach auxiliary effect.

- AudioFlinger
Created new classes to control effect engines in effect library and manage effect connections to tracks or
output mix:
  EffectModule: wrapper object controlling the effect engine implementation in the effect library. There
	is one EffectModule per instance of an effect in a given audio session
  EffectChain: group of effects associated to one audio session. There is one EffectChain per audio session.
	EffectChain for session 0 is for output mix effects, other chains are attached to audio tracks
	with same session ID. Each chain contains a variable number of EffectModules
  EffectHandle: implements the IEffect interface. There is one EffectHandle object for each application
	controlling (or using) an effect module. THe EffectModule maintians a list of EffectHandles.

Added support for effect modules and effect chains creation in PlaybackThread.
modified mixer thread loop to allow track volume control by effect modules and call effect processing.

-AudioMixer
Each track now specifies its output buffer used by mixer for accumulation
Modified mixer process functions to process tracks by groups of tracks with same buffer
Modified track process functions to support accumulation to auxiliary channel

Change-Id: I26d5f7c9e070a89bdd383e1a659f8b7ca150379c

4 files changed, 11 insertions, 10 deletions

diff --git a/media/libeffects/EffectEqualizer.cpp b/media/libeffects/EffectEqualizer.cpp
index c08f4f5..e39e595 100644
--- a/media/libeffects/EffectEqualizer.cpp
+++ b/media/libeffects/EffectEqualizer.cpp
@@ -114,7 +114,7 @@ int Equalizer_setParameter(AudioEqualizer * pEqualizer, int32_t *pParam, void *p
 //--- Effect Library Interface Implementation
 //
 
-extern "C" int EffectQueryNumberEffects(int *pNumEffects) {
+extern "C" int EffectQueryNumberEffects(uint32_t *pNumEffects) {
     *pNumEffects = 1;
     gEffectIndex = 0;
     return 0;
diff --git a/media/libeffects/EffectReverb.c b/media/libeffects/EffectReverb.c
index 3181504..202f50b 100644
--- a/media/libeffects/EffectReverb.c
+++ b/media/libeffects/EffectReverb.c
@@ -18,7 +18,8 @@
 //
 #define LOG_NDEBUG 0
 #include <cutils/log.h>
-
+#include <stdlib.h>
+#include <string.h>
 #include <stdbool.h>
 #include "EffectReverb.h"
 #include "EffectsMath.h"
@@ -86,7 +87,7 @@ static const effect_descriptor_t * const gDescriptors[] = {
 
 /*--- Effect Library Interface Implementation ---*/
 
-int EffectQueryNumberEffects(int *pNumEffects) {
+int EffectQueryNumberEffects(uint32_t *pNumEffects) {
     *pNumEffects = sizeof(gDescriptors) / sizeof(const effect_descriptor_t *)
             - 1;
     gEffectIndex = 0;
diff --git a/media/libeffects/EffectReverb.h b/media/libeffects/EffectReverb.h
index cd14891..578e09e 100644
--- a/media/libeffects/EffectReverb.h
+++ b/media/libeffects/EffectReverb.h
@@ -292,7 +292,7 @@ typedef struct reverb_module_s {
  * Effect API
  *------------------------------------
 */
-int EffectQueryNumberEffects(int *pNumEffects);
+int EffectQueryNumberEffects(uint32_t *pNumEffects);
 int EffectQueryNext(effect_descriptor_t *pDescriptor);
 int EffectCreate(effect_uuid_t *effectUID, effect_interface_t *pInterface);
 int EffectRelease(effect_interface_t interface);
diff --git a/media/libeffects/EffectsFactory.c b/media/libeffects/EffectsFactory.c
index 35a1001..6800765 100644
--- a/media/libeffects/EffectsFactory.c
+++ b/media/libeffects/EffectsFactory.c
@@ -39,7 +39,7 @@ static int gInitDone; // true is global initialization has been preformed
 static int init();
 static int loadLibrary(const char *libPath, int *handle);
 static int unloadLibrary(int handle);
-static int numEffectModules();
+static uint32_t numEffectModules();
 static int findEffect(effect_uuid_t *uuid, lib_entry_t **lib, effect_descriptor_t **desc);
 static void dumpEffectDescriptor(effect_descriptor_t *desc, char *str, size_t len);
 
@@ -96,7 +96,7 @@ const struct effect_interface_s gInterface = {
 //      Effect Factory Interface functions
 /////////////////////////////////////////////////
 
-int EffectQueryNumberEffects(int *pNumEffects)
+int EffectQueryNumberEffects(uint32_t *pNumEffects)
 {
     int ret = init();
     if (ret < 0) {
@@ -353,8 +353,8 @@ int loadLibrary(const char *libPath, int *handle)
     effect_QueryNextEffect_t queryFx;
     effect_CreateEffect_t createFx;
     effect_ReleaseEffect_t releaseFx;
-    int numFx;
-    int fx;
+    uint32_t numFx;
+    uint32_t fx;
     int ret;
     list_elem_t *e, *descHead = NULL;
     lib_entry_t *l;
@@ -525,9 +525,9 @@ int unloadLibrary(int handle)
 
 
 
-int numEffectModules() {
+uint32_t numEffectModules() {
     list_elem_t *e = gLibraryList;
-    int cnt = 0;
+    uint32_t cnt = 0;
 
     // Reset pointers for EffectQueryNext()
     gCurLib = e;