hal: post_proc: add volume based audio calibration support

- add new effect module to listen to volume and device change
- based on volume levels of all streams active over speaker
  compute gain based calibration level and communicate
  with audio HAL to send the same to ACDB loader
- make audio HAL singleton

Bug: 22100304.

Change-Id: If74bf66d32def85022d79ccb9f84c3b85c8a2dc9

2 files changed, 786 insertions, 0 deletions

diff --git a/post_proc/Android.mk b/post_proc/Android.mk
index 49270448..b8aa9fc2 100644
--- a/post_proc/Android.mk
+++ b/post_proc/Android.mk
@@ -29,5 +29,32 @@ LOCAL_C_INCLUDES := \
 	$(call include-path-for, audio-effects)
 
 include $(BUILD_SHARED_LIBRARY)
+endif
+
+################################################################################
+
+ifneq ($(filter msm8992 msm8994,$(TARGET_BOARD_PLATFORM)),)
+
+include $(CLEAR_VARS)
+
+LOCAL_CFLAGS := -DLIB_AUDIO_HAL="/system/lib/hw/audio.primary."$(TARGET_BOARD_PLATFORM)".so"
+
+LOCAL_SRC_FILES:= \
+	volume_listener.c
+
+LOCAL_CFLAGS+= -O2 -fvisibility=hidden
+
+LOCAL_SHARED_LIBRARIES := \
+	libcutils \
+	liblog \
+	libdl
+
+LOCAL_MODULE_RELATIVE_PATH := soundfx
+LOCAL_MODULE:= libvolumelistener
+
+LOCAL_C_INCLUDES := \
+	$(call include-path-for, audio-effects)
+
+include $(BUILD_SHARED_LIBRARY)
 
 endif
diff --git a/post_proc/volume_listener.c b/post_proc/volume_listener.c
new file mode 100644
index 00000000..e0193dde
--- /dev/null
+++ b/post_proc/volume_listener.c
@@ -0,0 +1,759 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "volume_listener"
+//#define LOG_NDEBUG 0
+#include <stdlib.h>
+#include <dlfcn.h>
+
+#include <cutils/list.h>
+#include <cutils/log.h>
+#include <hardware/audio_effect.h>
+#include <cutils/properties.h>
+
+#define PRIMARY_HAL_PATH XSTR(LIB_AUDIO_HAL)
+#define XSTR(x) STR(x)
+#define STR(x) #x
+
+#define VOL_FLAG ( EFFECT_FLAG_TYPE_INSERT | \
+                   EFFECT_FLAG_VOLUME_IND | \
+                   EFFECT_FLAG_DEVICE_IND | \
+                   EFFECT_FLAG_OFFLOAD_SUPPORTED)
+
+#define PRINT_STREAM_TYPE(i) ALOGV("descriptor found and is of stream type %s ",\
+                                                            i == MUSIC?"MUSIC": \
+                                                            i == RING?"RING": \
+                                                            i == ALARM?"ALARM": \
+                                                            i == VOICE_CALL?"Voice_call": \
+                                                            i == NOTIFICATION?"Notification":\
+                                                            "--INVALID--"); \
+
+#define MAX_GAIN_LEVELS 5
+
+#define AHAL_GAIN_DEPENDENT_INTERFACE_FUNCTION "audio_hw_send_gain_dep_calibration"
+
+enum {
+    VOL_LISTENER_STATE_UNINITIALIZED,
+    VOL_LISTENER_STATE_INITIALIZED,
+    VOL_LISTENER_STATE_ACTIVE,
+};
+
+typedef struct vol_listener_context_s vol_listener_context_t;
+static const struct effect_interface_s effect_interface;
+
+/* flag to avoid multiple initialization */
+static bool initialized = false;
+
+/* current gain dep cal level that was pushed succesfully */
+static int current_gain_dep_cal_level = -1;
+
+enum STREAM_TYPE {
+    MUSIC,
+    RING,
+    ALARM,
+    VOICE_CALL,
+    NOTIFICATION,
+    MAX_STREAM_TYPES,
+};
+
+struct vol_listener_context_s {
+    const struct effect_interface_s *itfe;
+    struct listnode effect_list_node;
+    effect_config_t config;
+    const effect_descriptor_t *desc;
+    uint32_t stream_type;
+    uint32_t session_id;
+    uint32_t state;
+    uint32_t dev_id;
+    float left_vol;
+    float right_vol;
+};
+
+/* volume listener, music UUID: 08b8b058-0590-11e5-ac71-0025b32654a0 */
+const effect_descriptor_t vol_listener_music_descriptor = {
+    { 0x08b8b058, 0x0590, 0x11e5, 0xac71, { 0x00, 0x25, 0xb3, 0x26, 0x54, 0xa0 } },  // type
+    { 0x08b8b058, 0x0590, 0x11e5, 0xac71, { 0x00, 0x25, 0xb3, 0x26, 0x54, 0xa0 } },  // uuid
+    EFFECT_CONTROL_API_VERSION,
+    VOL_FLAG,
+    0, /* TODO */
+    1,
+    "Volume listener for Music",
+    "Qualcomm Technologies Inc.",
+};
+
+/* volume listener, ring UUID: 0956df94-0590-11e5-bdbe-0025b32654a0 */
+const effect_descriptor_t vol_listener_ring_descriptor = {
+    { 0x0956df94, 0x0590, 0x11e5, 0xbdbe, { 0x00, 0x25, 0xb3, 0x26, 0x54, 0xa0 } }, // type
+    { 0x0956df94, 0x0590, 0x11e5, 0xbdbe, { 0x00, 0x25, 0xb3, 0x26, 0x54, 0xa0 } }, // uuid
+    EFFECT_CONTROL_API_VERSION,
+    VOL_FLAG,
+    0, /* TODO */
+    1,
+    "Volume listener for ring",
+    "Qualcomm Technologies Inc",
+};
+
+/* volume listener, alarm UUID: 09f303e2-0590-11e5-8fdb-0025b32654a0 */
+const effect_descriptor_t vol_listener_alarm_descriptor = {
+    { 0x09f303e2, 0x0590, 0x11e5, 0x8fdb, { 0x00, 0x25, 0xb3, 0x26, 0x54, 0xa0 } }, // type
+    { 0x09f303e2, 0x0590, 0x11e5, 0x8fdb, { 0x00, 0x25, 0xb3, 0x26, 0x54, 0xa0 } }, // uuid
+    EFFECT_CONTROL_API_VERSION,
+    VOL_FLAG,
+    0, /* TODO */
+    1,
+    "Volume listener for alarm",
+    "Qualcomm Technologies Inc",
+};
+
+/* volume listener, voice call UUID: 0ace5c08-0590-11e5-ae9e-0025b32654a0 */
+const effect_descriptor_t vol_listener_voice_call_descriptor = {
+    { 0x0ace5c08, 0x0590, 0x11e5, 0xae9e, { 0x00, 0x25, 0xb3, 0x26, 0x54, 0xa0 } }, // type
+    { 0x0ace5c08, 0x0590, 0x11e5, 0xae9e, { 0x00, 0x25, 0xb3, 0x26, 0x54, 0xa0 } }, // uuid
+    EFFECT_CONTROL_API_VERSION,
+    VOL_FLAG,
+    0, /* TODO */
+    1,
+    "Volume listener for voice call",
+    "Qualcomm Technologies Inc",
+};
+
+/* volume listener, notification UUID: 0b776dde-0590-11e5-81ba-0025b32654a0 */
+const effect_descriptor_t vol_listener_notification_descriptor = {
+    { 0x0b776dde, 0x0590, 0x11e5, 0x81ba, { 0x00, 0x25, 0xb3, 0x26, 0x54, 0xa0 } }, // type
+    { 0x0b776dde, 0x0590, 0x11e5, 0x81ba, { 0x00, 0x25, 0xb3, 0x26, 0x54, 0xa0 } }, // uuid
+    EFFECT_CONTROL_API_VERSION,
+    VOL_FLAG,
+    0, /* TODO */
+    1,
+    "Volume listener for notification",
+    "Qualcomm Technologies Inc",
+};
+
+struct amp_db_and_gain_table {
+    float amp;
+    float db;
+    uint32_t level;
+} amp_to_dBLevel_table;
+
+// using gain level for non-drc volume curve
+static const struct amp_db_and_gain_table  volume_curve_gain_mapping_table[MAX_GAIN_LEVELS] =
+{
+    /* Level 0 in the calibration database contains default calibration */
+    { 0.001774, -55, 5 },
+    { 0.501187,  -6, 4 },
+    { 0.630957,  -4, 3 },
+    { 0.794328,  -2, 2 },
+    { 1.0,        0, 1 },
+};
+
+static const effect_descriptor_t *descriptors[] = {
+    &vol_listener_music_descriptor,
+    &vol_listener_ring_descriptor,
+    &vol_listener_alarm_descriptor,
+    &vol_listener_voice_call_descriptor,
+    &vol_listener_notification_descriptor,
+    NULL,
+};
+
+pthread_once_t once = PTHREAD_ONCE_INIT;
+/* flag to indicate if init was success */
+static int init_status;
+
+/* current volume level for which gain dep cal level was selected */
+static float current_vol = 0.0;
+
+/* HAL interface to send calibration */
+static bool (*send_gain_dep_cal)(int);
+
+/* if dumping allowed */
+static bool dumping_enabled = false;
+
+/* list of created effects. */
+struct listnode vol_effect_list;
+
+/* lock must be held when modifying or accessing created_effects_list */
+pthread_mutex_t vol_listner_init_lock;
+
+/*
+ *  Local functions
+ */
+static void dump_list_l()
+{
+    struct listnode *node;
+    vol_listener_context_t *context;
+
+    ALOGW("DUMP_START :: ===========");
+
+    list_for_each(node, &vol_effect_list) {
+        context = node_to_item(node, struct vol_listener_context_s, effect_list_node);
+        // dump stream_type / Device / session_id / left / righ volume
+        ALOGW("%s: streamType [%s] Device [%d] state [%d] sessionID [%d] volume (L/R) [%f / %f] ",
+                __func__,
+                context->stream_type == MUSIC ? "MUSIC" :
+                context->stream_type == RING ? "RING" :
+                context->stream_type == ALARM ? "ALARM" :
+                context->stream_type == VOICE_CALL ? "VOICE_CALL" :
+                context->stream_type == NOTIFICATION ? "NOTIFICATION" : "--INVALID--",
+                context->dev_id, context->state, context->session_id, context->left_vol,context->right_vol);
+    }
+
+    ALOGW("DUMP_END :: ===========");
+}
+
+static void check_and_set_gain_dep_cal()
+{
+    // iterate through list and make decision to set new gain dep cal level for speaker device
+    // 1. find all usecase active on speaker
+    // 2. find average of left and right for each usecase
+    // 3. find the highest of all the active usecase
+    // 4. if new value is different than the current value then load new calibration
+
+    struct listnode *node = NULL;
+    float new_vol = 0.0;
+    int max_level = 0;
+    vol_listener_context_t *context = NULL;
+    if (dumping_enabled) {
+        dump_list_l();
+    }
+
+    ALOGV("%s ==> Start ...", __func__);
+
+    // select the highest volume on speaker device
+    list_for_each(node, &vol_effect_list) {
+        context = node_to_item(node, struct vol_listener_context_s, effect_list_node);
+        if ((context->state == VOL_LISTENER_STATE_ACTIVE) &&
+            (context->dev_id & AUDIO_DEVICE_OUT_SPEAKER) &&
+            (new_vol < (context->left_vol + context->right_vol) / 2)) {
+            new_vol = (context->left_vol + context->right_vol) / 2;
+        }
+    }
+
+    if (new_vol != current_vol) {
+        ALOGV("%s:: Change in decision :: current volume is %f new volume is %f",
+              __func__, current_vol, new_vol);
+
+        if (send_gain_dep_cal != NULL) {
+            // send Gain dep cal level
+            int gain_dep_cal_level = -1;
+
+            if (new_vol >= 1) { // max amplitude, use highest DRC level
+                gain_dep_cal_level = volume_curve_gain_mapping_table[MAX_GAIN_LEVELS - 1].level;
+            } else if (new_vol <= 0) {
+                gain_dep_cal_level = volume_curve_gain_mapping_table[0].level;
+            } else {
+                for (max_level = 0; max_level + 1 < MAX_GAIN_LEVELS; max_level++) {
+                    if (new_vol < volume_curve_gain_mapping_table[max_level + 1].amp &&
+                        new_vol >= volume_curve_gain_mapping_table[max_level].amp) {
+                        gain_dep_cal_level = volume_curve_gain_mapping_table[max_level].level;
+                        ALOGV("%s: volume(%f), gain dep cal selcetd %d ",
+                              __func__, current_vol, gain_dep_cal_level);
+                        break;
+                    }
+                }
+            }
+
+            // check here if previous gain dep cal level was not same
+            if (gain_dep_cal_level != -1) {
+                if (gain_dep_cal_level != current_gain_dep_cal_level) {
+                    // decision made .. send new level now
+                    if (!send_gain_dep_cal(gain_dep_cal_level)) {
+                        ALOGE("%s: Failed to set gain dep cal level", __func__);
+                    } else {
+                        // Success in setting the gain dep cal level, store new level and Volume
+                        if (dumping_enabled) {
+                            ALOGW("%s: (old/new) Volume (%f/%f) (old/new) level (%d/%d)",
+                                  __func__, current_vol, new_vol, current_gain_dep_cal_level,
+                                  gain_dep_cal_level);
+                        } else {
+                            ALOGV("%s: Change in Cal::(old/new) Volume (%f/%f) (old/new) level (%d/%d)",
+                                  __func__, current_vol, new_vol, current_gain_dep_cal_level,
+                                  gain_dep_cal_level);
+                        }
+                        current_gain_dep_cal_level = gain_dep_cal_level;
+                        current_vol = new_vol;
+                    }
+                } else {
+                    if (dumping_enabled) {
+                        ALOGW("%s: volume changed but gain dep cal level is still the same",
+                              __func__);
+                    } else {
+                        ALOGV("%s: volume changed but gain dep cal level is still the same",
+                              __func__);
+                    }
+                }
+            } else {
+                ALOGW("%s: Failed to find gain dep cal level for volume %f", __func__, new_vol);
+            }
+        } else {
+            ALOGE("%s: not able to send calibration, NULL function pointer",
+                  __func__);
+        }
+    } else {
+        ALOGV("%s:: volume not changed, stick to same config ..... ", __func__);
+    }
+
+    ALOGV("check_and_set_gain_dep_cal ==> End ");
+}
+
+/*
+ * Effect Control Interface Implementation
+ */
+
+static int vol_effect_process(effect_handle_t self,
+                              audio_buffer_t *in_buffer,
+                              audio_buffer_t *out_buffer)
+{
+    int status = 0;
+    ALOGV("%s Called ", __func__);
+
+    vol_listener_context_t *context = (vol_listener_context_t *)self;
+    pthread_mutex_lock(&vol_listner_init_lock);
+
+    if (context->state != VOL_LISTENER_STATE_ACTIVE) {
+        ALOGE("%s: state is not active .. return error", __func__);
+        status = -EINVAL;
+        goto exit;
+    }
+
+    // calculation based on channel count 2
+    if (in_buffer->raw != out_buffer->raw) {
+        memcpy(out_buffer->raw, in_buffer->raw, out_buffer->frameCount * 2 * sizeof(int16_t));
+    } else {
+        ALOGW("%s: something wrong, didn't handle in_buffer and out_buffer same address case",
+              __func__);
+    }
+
+exit:
+    pthread_mutex_unlock(&vol_listner_init_lock);
+    return status;
+}
+
+
+static int vol_effect_command(effect_handle_t self,
+                              uint32_t cmd_code, uint32_t cmd_size,
+                              void *p_cmd_data, uint32_t *reply_size,
+                              void *p_reply_data)
+{
+    vol_listener_context_t *context = (vol_listener_context_t *)self;
+    int status = 0;
+
+    ALOGV("%s Called ", __func__);
+    pthread_mutex_lock(&vol_listner_init_lock);
+
+    if (context == NULL || context->state == VOL_LISTENER_STATE_UNINITIALIZED) {
+        ALOGE("%s: %s is NULL", __func__, (context == NULL) ?
+              "context" : "context->state");
+        status = -EINVAL;
+        goto exit;
+    }
+
+    switch (cmd_code) {
+    case EFFECT_CMD_INIT:
+        ALOGV("%s :: cmd called EFFECT_CMD_INIT", __func__);
+        if (p_reply_data == NULL || *reply_size != sizeof(int)) {
+            ALOGE("%s: EFFECT_CMD_INIT: %s, sending -EINVAL", __func__,
+                  (p_reply_data == NULL) ? "p_reply_data is NULL" :
+                  "*reply_size != sizeof(int)");
+            return -EINVAL;
+        }
+        *(int *)p_reply_data = 0;
+        break;
+
+    case EFFECT_CMD_SET_CONFIG:
+        ALOGV("%s :: cmd called EFFECT_CMD_SET_CONFIG", __func__);
+        break;
+
+    case EFFECT_CMD_GET_CONFIG:
+        ALOGV("%s :: cmd called EFFECT_CMD_GET_CONFIG", __func__);
+        break;
+
+    case EFFECT_CMD_RESET:
+        ALOGV("%s :: cmd called EFFECT_CMD_RESET", __func__);
+        break;
+
+    case EFFECT_CMD_SET_AUDIO_MODE:
+        ALOGV("%s :: cmd called EFFECT_CMD_SET_AUDIO_MODE", __func__);
+        break;
+
+    case EFFECT_CMD_OFFLOAD:
+        ALOGV("%s :: cmd called EFFECT_CMD_OFFLOAD", __func__);
+        if (p_reply_data == NULL || *reply_size != sizeof(int)) {
+            ALOGE("%s: EFFECT_CMD_OFFLOAD: %s, sending -EINVAL", __func__,
+                  (p_reply_data == NULL) ? "p_reply_data is NULL" :
+                  "*reply_size != sizeof(int)");
+            return -EINVAL;
+        }
+        *(int *)p_reply_data = 0;
+        break;
+
+    case EFFECT_CMD_ENABLE:
+        ALOGV("%s :: cmd called EFFECT_CMD_ENABLE", __func__);
+        if (p_reply_data == NULL || *reply_size != sizeof(int)) {
+            ALOGE("%s: EFFECT_CMD_ENABLE: %s, sending -EINVAL", __func__,
+                   (p_reply_data == NULL) ? "p_reply_data is NULL" :
+                   "*reply_size != sizeof(int)");
+            status = -EINVAL;
+            goto exit;
+        }
+
+        if (context->state != VOL_LISTENER_STATE_INITIALIZED) {
+            ALOGE("%s: EFFECT_CMD_ENABLE : state not INITIALIZED", __func__);
+            status = -ENOSYS;
+            goto exit;
+        }
+
+        context->state = VOL_LISTENER_STATE_ACTIVE;
+        *(int *)p_reply_data = 0;
+
+        // After changing the state and if device is speaker
+        // recalculate gain dep cal level
+        if (context->dev_id & AUDIO_DEVICE_OUT_SPEAKER) {
+                check_and_set_gain_dep_cal();
+        }
+
+        break;
+
+    case EFFECT_CMD_DISABLE:
+        ALOGV("%s :: cmd called EFFECT_CMD_DISABLE", __func__);
+        if (p_reply_data == NULL || *reply_size != sizeof(int)) {
+            ALOGE("%s: EFFECT_CMD_DISABLE: %s, sending -EINVAL", __func__,
+                  (p_reply_data == NULL) ? "p_reply_data is NULL" :
+                  "*reply_size != sizeof(int)");
+            status = -EINVAL;
+            goto exit;
+        }
+
+        if (context->state != VOL_LISTENER_STATE_ACTIVE) {
+            ALOGE("%s: EFFECT_CMD_ENABLE : state not ACTIVE", __func__);
+            status = -ENOSYS;
+            goto exit;
+        }
+
+        context->state = VOL_LISTENER_STATE_INITIALIZED;
+        *(int *)p_reply_data = 0;
+
+        // After changing the state and if device is speaker
+        // recalculate gain dep cal level
+        if (context->dev_id & AUDIO_DEVICE_OUT_SPEAKER) {
+            check_and_set_gain_dep_cal();
+        }
+
+        break;
+
+    case EFFECT_CMD_GET_PARAM:
+        ALOGV("%s :: cmd called EFFECT_CMD_GET_PARAM", __func__);
+        break;
+
+    case EFFECT_CMD_SET_PARAM:
+        ALOGV("%s :: cmd called EFFECT_CMD_SET_PARAM", __func__);
+        break;
+
+    case EFFECT_CMD_SET_DEVICE:
+    {
+        uint32_t new_device;
+        bool recompute_gain_dep_cal_Level = false;
+        ALOGV("cmd called EFFECT_CMD_SET_DEVICE ");
+
+        if (p_cmd_data == NULL) {
+            ALOGE("%s: EFFECT_CMD_SET_DEVICE: cmd data NULL", __func__);
+            status = -EINVAL;
+            goto exit;
+        }
+
+        new_device = *(uint32_t *)p_cmd_data;
+        ALOGV("%s :: EFFECT_CMD_SET_DEVICE: (current/new) device (0x%x / 0x%x)",
+               __func__, context->dev_id, new_device);
+
+        // check if old or new device is speaker
+        if ((context->dev_id & AUDIO_DEVICE_OUT_SPEAKER) ||
+            (new_device & AUDIO_DEVICE_OUT_SPEAKER)) {
+            recompute_gain_dep_cal_Level = true;
+        }
+
+        context->dev_id = new_device;
+
+        if (recompute_gain_dep_cal_Level) {
+            check_and_set_gain_dep_cal();
+        }
+    }
+    break;
+
+    case EFFECT_CMD_SET_VOLUME:
+    {
+        float left_vol = 0, right_vol = 0;
+        bool recompute_gain_dep_cal_Level = false;
+
+        ALOGV("cmd called EFFECT_CMD_SET_VOLUME");
+        if (p_cmd_data == NULL || cmd_size != 2 * sizeof(uint32_t)) {
+            ALOGE("%s: EFFECT_CMD_SET_VOLUME: %s", __func__, (p_cmd_data == NULL) ?
+                  "p_cmd_data is NULL" : "cmd_size issue");
+            status = -EINVAL;
+            goto exit;
+        }
+
+        if (context->dev_id & AUDIO_DEVICE_OUT_SPEAKER) {
+            recompute_gain_dep_cal_Level = true;
+        }
+
+        left_vol = (float)(*(uint32_t *)p_cmd_data) / (1 << 24);
+        right_vol = (float)(*((uint32_t *)p_cmd_data + 1)) / (1 << 24);
+        ALOGV("Current Volume (%f / %f ) new Volume (%f / %f)", context->left_vol,
+              context->right_vol, left_vol, right_vol);
+
+        context->left_vol = left_vol;
+        context->right_vol = right_vol;
+
+        // recompute gan dep cal level only if volume changed on speaker device
+        if (recompute_gain_dep_cal_Level) {
+            check_and_set_gain_dep_cal();
+        }
+    }
+    break;
+
+    default:
+        ALOGW("volume_listener_command invalid command %d", cmd_code);
+        status = -ENOSYS;
+        break;
+    }
+
+exit:
+    pthread_mutex_unlock(&vol_listner_init_lock);
+    return status;
+}
+
+/* Effect Control Interface Implementation: get_descriptor */
+static int vol_effect_get_descriptor(effect_handle_t   self,
+                                     effect_descriptor_t *descriptor)
+{
+    vol_listener_context_t *context = (vol_listener_context_t *)self;
+    ALOGV("%s Called ", __func__);
+
+    if (descriptor == NULL) {
+        ALOGE("%s: descriptor is NULL", __func__);
+        return -EINVAL;
+    }
+
+    *descriptor = *context->desc;
+    return 0;
+}
+
+static void init_once()
+{
+    int i = 0;
+    if (initialized) {
+        ALOGV("%s : already init .. do nothing", __func__);
+        return;
+    }
+
+    ALOGD("%s Called ", __func__);
+    pthread_mutex_init(&vol_listner_init_lock, NULL);
+
+    // get hal function pointer
+    if (access(PRIMARY_HAL_PATH, R_OK) == 0) {
+        void *hal_lib_pointer = dlopen(PRIMARY_HAL_PATH, RTLD_NOW);
+        if (hal_lib_pointer == NULL) {
+            ALOGE("%s: DLOPEN failed for %s", __func__, PRIMARY_HAL_PATH);
+            send_gain_dep_cal = NULL;
+        } else {
+            ALOGV("%s: DLOPEN of %s Succes .. next get HAL entry function", __func__, PRIMARY_HAL_PATH);
+            send_gain_dep_cal = (bool (*)(int))dlsym(hal_lib_pointer, AHAL_GAIN_DEPENDENT_INTERFACE_FUNCTION);
+            if (send_gain_dep_cal == NULL) {
+                ALOGE("Couldnt able to get the function symbol");
+            }
+        }
+    } else {
+        ALOGE("%s: not able to acces lib %s ", __func__, PRIMARY_HAL_PATH);
+        send_gain_dep_cal = NULL;
+    }
+
+    // check system property to see if dumping is required
+    char check_dump_val[PROPERTY_VALUE_MAX];
+    property_get("audio.volume.listener.dump", check_dump_val, "0");
+    if (atoi(check_dump_val)) {
+        dumping_enabled = true;
+    }
+
+    init_status = 0;
+    list_init(&vol_effect_list);
+    initialized = true;
+}
+
+static int lib_init()
+{
+    pthread_once(&once, init_once);
+    ALOGV("%s Called ", __func__);
+    return init_status;
+}
+
+static int vol_prc_lib_create(const effect_uuid_t *uuid,
+                              int32_t session_id,
+                              int32_t io_id,
+                              effect_handle_t *p_handle)
+{
+    int itt = 0;
+    vol_listener_context_t *context = NULL;
+
+    ALOGV("volume_prc_lib_create .. called ..");
+
+    if (lib_init() != 0) {
+        return init_status;
+    }
+
+    if (p_handle == NULL || uuid == NULL) {
+        ALOGE("%s: %s is NULL", __func__, (p_handle == NULL) ? "p_handle" : "uuid");
+        return -EINVAL;
+    }
+
+    context = (vol_listener_context_t *)calloc(1, sizeof(vol_listener_context_t));
+
+    if (context == NULL) {
+        ALOGE("%s: failed to allocate for context .. oops !!", __func__);
+        return -EINVAL;
+    }
+
+    // check if UUID is supported
+    for (itt = 0; descriptors[itt] != NULL; itt++) {
+        if (memcmp(uuid, &descriptors[itt]->uuid, sizeof(effect_uuid_t)) == 0) {
+            // check if this correct .. very imp
+            context->desc = descriptors[itt];
+            context->stream_type = itt;
+            PRINT_STREAM_TYPE(itt)
+            break;
+        }
+    }
+
+    if (descriptors[itt] == NULL) {
+        ALOGE("%s .. couldnt find passed uuid, something wrong", __func__);
+        free(context);
+        return -EINVAL;
+    }
+
+    ALOGV("%s CREATED_CONTEXT %p", __func__, context);
+
+    context->itfe = &effect_interface;
+    context->state = VOL_LISTENER_STATE_INITIALIZED;
+    context->dev_id = AUDIO_DEVICE_NONE;
+    context->session_id = session_id;
+
+    // Add this to master list
+    pthread_mutex_lock(&vol_listner_init_lock);
+    list_add_tail(&vol_effect_list, &context->effect_list_node);
+
+    if (dumping_enabled) {
+        dump_list_l();
+    }
+
+    pthread_mutex_unlock(&vol_listner_init_lock);
+
+    *p_handle = (effect_handle_t)context;
+    return 0;
+}
+
+static int vol_prc_lib_release(effect_handle_t handle)
+{
+    struct listnode *node = NULL;
+    vol_listener_context_t *context = NULL;
+    vol_listener_context_t *recv_contex = (vol_listener_context_t *)handle;
+    int status = -1;
+    bool recompute_flag = false;
+    int active_stream_count = 0;
+    ALOGV("%s context %p", __func__, handle);
+    pthread_mutex_lock(&vol_listner_init_lock);
+
+    // check if the handle/context provided is valid
+    list_for_each(node, &vol_effect_list) {
+        context = node_to_item(node, struct vol_listener_context_s, effect_list_node);
+        if ((memcmp(&(context->desc->uuid), &(recv_contex->desc->uuid), sizeof(effect_uuid_t)) == 0)
+            && (context->session_id == recv_contex->session_id)
+            && (context->stream_type == recv_contex->stream_type)) {
+            ALOGV("--- Found something to remove ---");
+            list_remove(&context->effect_list_node);
+            PRINT_STREAM_TYPE(context->stream_type);
+            if (context->dev_id && AUDIO_DEVICE_OUT_SPEAKER) {
+                recompute_flag = true;
+            }
+            free(context);
+            status = 0;
+        } else {
+            ++active_stream_count;
+        }
+    }
+
+    if (status != 0) {
+        ALOGE("something wrong ... <<<--- Found NOTHING to remove ... ???? --->>>>>");
+    }
+
+    // if there are no active streams, reset cal and volume level
+    if (active_stream_count == 0) {
+        current_gain_dep_cal_level = -1;
+        current_vol = 0.0;
+    }
+
+    if (recompute_flag) {
+        check_and_set_gain_dep_cal();
+    }
+
+    if (dumping_enabled) {
+        dump_list_l();
+    }
+    pthread_mutex_unlock(&vol_listner_init_lock);
+    return status;
+}
+
+static int vol_prc_lib_get_descriptor(const effect_uuid_t *uuid,
+                                      effect_descriptor_t *descriptor)
+{
+    int i = 0;
+    ALOGV("%s Called ", __func__);
+    if (lib_init() != 0) {
+        return init_status;
+    }
+
+    if (descriptor == NULL || uuid == NULL) {
+        ALOGE("%s: %s is NULL", __func__, (descriptor == NULL) ? "descriptor" : "uuid");
+        return -EINVAL;
+    }
+
+    for (i = 0; descriptors[i] != NULL; i++) {
+        if (memcmp(uuid, &descriptors[i]->uuid, sizeof(effect_uuid_t)) == 0) {
+            *descriptor = *descriptors[i];
+            return 0;
+        }
+    }
+
+    ALOGE("%s: couldnt found uuid passed, oops", __func__);
+    return  -EINVAL;
+}
+
+
+/* effect_handle_t interface implementation for volume listener effect */
+static const struct effect_interface_s effect_interface = {
+    vol_effect_process,
+    vol_effect_command,
+    vol_effect_get_descriptor,
+    NULL,
+};
+
+__attribute__((visibility("default")))
+audio_effect_library_t AUDIO_EFFECT_LIBRARY_INFO_SYM = {
+    .tag = AUDIO_EFFECT_LIBRARY_TAG,
+    .version = EFFECT_LIBRARY_API_VERSION,
+    .name = "Volume Listener Effect Library",
+    .implementor = "Qualcomm Technologies Inc.",
+    .create_effect = vol_prc_lib_create,
+    .release_effect = vol_prc_lib_release,
+    .get_descriptor = vol_prc_lib_get_descriptor,
+};