diff --git a/hal/audio_extn/audio_defs.h b/hal/audio_extn/audio_defs.h
index 0e1848e..a0b1949 100644
--- a/hal/audio_extn/audio_defs.h
+++ b/hal/audio_extn/audio_defs.h
@@ -306,4 +306,12 @@
     AUDIO_EXTN_PARAM_LICENSE_PARAMS,
 } audio_extn_param_id;
 
+typedef union {
+    struct audio_out_render_window_param render_window_params;
+} audio_extn_loopback_param_payload;
+
+typedef enum {
+    AUDIO_EXTN_PARAM_LOOPBACK_RENDER_WINDOW /* PARAM to set render window */
+} audio_extn_loopback_param_id;
+
 #endif /* AUDIO_DEFS_H */
diff --git a/hal/audio_extn/audio_extn.c b/hal/audio_extn/audio_extn.c
index c6c0924..3eee428 100755
--- a/hal/audio_extn/audio_extn.c
+++ b/hal/audio_extn/audio_extn.c
@@ -1478,6 +1478,33 @@
     return ret;
 }
 
+#ifdef AUDIO_HW_LOOPBACK_ENABLED
+int audio_extn_hw_loopback_set_param_data(audio_patch_handle_t handle,
+                                          audio_extn_loopback_param_id param_id,
+                                          audio_extn_loopback_param_payload *payload) {
+    int ret = -EINVAL;
+
+    if (!payload) {
+        ALOGE("%s:: Invalid Param",__func__);
+        return ret;
+    }
+
+    ALOGD("%d: %s: param id is %d\n", __LINE__, __func__, param_id);
+
+    switch(param_id) {
+        case AUDIO_EXTN_PARAM_LOOPBACK_RENDER_WINDOW:
+            ret = audio_extn_hw_loopback_set_render_window(handle, payload);
+            break;
+        default:
+            ALOGE("%s: unsupported param id %d", __func__, param_id);
+            break;
+    }
+
+    return ret;
+}
+#endif
+
+
 /* API to get playback stream specific config parameters */
 int audio_extn_out_get_param_data(struct stream_out *out,
                              audio_extn_param_id param_id,
diff --git a/hal/audio_extn/audio_extn.h b/hal/audio_extn/audio_extn.h
index 6ec07b3..e158b0a 100644
--- a/hal/audio_extn/audio_extn.h
+++ b/hal/audio_extn/audio_extn.h
@@ -999,6 +999,14 @@
                                     const struct audio_port_config *config);
 int audio_extn_hw_loopback_get_audio_port(struct audio_hw_device *dev,
                                     struct audio_port *port_in);
+
+int audio_extn_hw_loopback_set_param_data(audio_patch_handle_t handle,
+                                          audio_extn_loopback_param_id param_id,
+                                          audio_extn_loopback_param_payload *payload);
+
+int audio_extn_hw_loopback_set_render_window(audio_patch_handle_t handle,
+                                             struct audio_out_render_window_param *render_window);
+
 int audio_extn_hw_loopback_init(struct audio_device *adev);
 void audio_extn_hw_loopback_deinit(struct audio_device *adev);
 #else
@@ -1026,6 +1034,18 @@
 {
     return -ENOSYS;
 }
+static int __unused audio_extn_hw_loopback_set_param_data(audio_patch_handle_t handle __unused,
+                                               audio_extn_loopback_param_id param_id __unused,
+                                               audio_extn_loopback_param_payload *payload __unused)
+{
+    return -ENOSYS;
+}
+
+static int __unused audio_extn_hw_loopback_set_render_window(audio_patch_handle_t handle __unused,
+                                     struct audio_out_render_window_param *render_window __unused)
+{
+    return -ENOSYS;
+}
 static int __unused audio_extn_hw_loopback_init(struct audio_device *adev __unused)
 {
     return -ENOSYS;
diff --git a/hal/audio_extn/hw_loopback.c b/hal/audio_extn/hw_loopback.c
index 990a283..7516717 100644
--- a/hal/audio_extn/hw_loopback.c
+++ b/hal/audio_extn/hw_loopback.c
@@ -357,6 +357,78 @@
     return 0;
 }
 
+#ifdef SNDRV_COMPRESS_RENDER_WINDOW
+static loopback_patch_t *get_active_loopback_patch(audio_patch_handle_t handle)
+{
+    int n = 0;
+    int patch_index = -1;
+    loopback_patch_t *active_loopback_patch = NULL;
+
+    for (n=0; n < MAX_NUM_PATCHES; n++) {
+        if (audio_loopback_mod->patch_db.num_patches > 0) {
+            if (audio_loopback_mod->patch_db.loopback_patch[n].patch_handle_id == handle) {
+                patch_index = n;
+                break;
+            }
+        } else {
+            ALOGE("%s, No active audio loopback patch", __func__);
+            return active_loopback_patch;
+        }
+    }
+
+    if ((patch_index > -1) && (patch_index < MAX_NUM_PATCHES))
+        active_loopback_patch = &(audio_loopback_mod->patch_db.loopback_patch[
+                                patch_index]);
+    else
+        ALOGE("%s, Requested Patch handle does not exist", __func__);
+
+    return active_loopback_patch;
+}
+
+int audio_extn_hw_loopback_set_render_window(audio_patch_handle_t handle,
+                      struct audio_out_render_window_param *render_window)
+{
+    struct snd_compr_metadata metadata = {0};
+    int ret = 0;
+    loopback_patch_t *active_loopback_patch = get_active_loopback_patch(handle);
+
+    if (active_loopback_patch == NULL) {
+        ALOGE("%s: Invalid patch handle", __func__);
+        ret = -EINVAL;
+        goto exit;
+    }
+
+    if (render_window == NULL) {
+        ALOGE("%s: Invalid render_window", __func__);
+        ret = -EINVAL;
+        goto exit;
+    }
+
+    metadata.key = SNDRV_COMPRESS_RENDER_WINDOW;
+    /*render window start value */
+    metadata.value[0] = 0xFFFFFFFF & render_window->render_ws; /* lsb */
+    metadata.value[1] = \
+            (0xFFFFFFFF00000000 & render_window->render_ws) >> 32; /* msb*/
+    /*render window end value */
+    metadata.value[2] = 0xFFFFFFFF & render_window->render_we; /* lsb */
+    metadata.value[3] = \
+            (0xFFFFFFFF00000000 & render_window->render_we) >> 32; /* msb*/
+
+    ret = compress_set_metadata(active_loopback_patch->sink_stream, &metadata);
+
+exit:
+    return ret;
+}
+#else
+int audio_extn_hw_loopback_set_render_window(struct audio_hw_device *dev,
+                      audio_patch_handle_t handle __unused,
+                      struct audio_out_render_window_param *render_window __unused)
+{
+    ALOGD("%s:: configuring render window not supported", __func__);
+    return 0;
+}
+#endif
+
 #if defined SNDRV_COMPRESS_LATENCY_MODE
 static void transcode_loopback_util_set_latency_mode(
                              loopback_patch_t *active_loopback_patch,
diff --git a/hal/audio_hw_extn_api.c b/hal/audio_hw_extn_api.c
index f5e0659..310b537 100644
--- a/hal/audio_hw_extn_api.c
+++ b/hal/audio_hw_extn_api.c
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
+* Copyright (c) 2016-2017, 2018, The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
@@ -423,6 +423,19 @@
     return ret;
 }
 
+int qahwi_loopback_set_param_data(audio_patch_handle_t handle,
+                                  audio_extn_loopback_param_id param_id,
+                                  void *payload) {
+    int ret = 0;
+
+    ret = audio_extn_hw_loopback_set_param_data(
+                                             handle,
+                                             param_id,
+                                             (audio_extn_loopback_param_payload *)payload);
+
+    return ret;
+}
+
 void qahwi_init(hw_device_t *device)
 {
     struct audio_device *adev = (struct audio_device *) device;
diff --git a/hal/msm8916/platform.c b/hal/msm8916/platform.c
index 7cc2a05..68ffd56 100644
--- a/hal/msm8916/platform.c
+++ b/hal/msm8916/platform.c
@@ -2833,6 +2833,9 @@
     /* free acdb_meta_key_list */
     platform_release_acdb_metainfo_key(platform);
 
+    if (my_data->acdb_deallocate)
+        my_data->acdb_deallocate();
+
     free(platform);
     /* deinit usb */
     audio_extn_usb_deinit();
diff --git a/hdmi_in_test/Makefile.am b/hdmi_in_test/Makefile.am
index 34e4ff5..eb74d21 100644
--- a/hdmi_in_test/Makefile.am
+++ b/hdmi_in_test/Makefile.am
@@ -1,9 +1,17 @@
 
 ACLOCAL_AMFLAGS = -I m4
 bin_PROGRAMS = hdmi_in_test
+bin_PROGRAMS += fmt_change_test
 pkgconfigdir = $(libdir)/pkgconfig
 
+REC_INCLUDES = -I $(top_srcdir)/qahw_api/inc
+REC_INCLUDES += -I $(top_srcdir)/qahw/inc
+
 hdmi_in_test_SOURCES = src/hdmi_in_event_test.c
 hdmi_in_test_CFLAGS  = $(CFLAGS) -Wno-sign-compare -Werror
 hdmi_in_test_LDADD = -llog -lpthread
 
+fmt_change_test_SOURCES = src/fmt_change_test.c
+fmt_change_test_CFLAGS  = $(CFLAGS) -Wno-sign-compare -Werror $(REC_INCLUDES)
+fmt_change_test_LDADD = -llog -lpthread ../qahw_api/libqahw.la
+
diff --git a/hdmi_in_test/src/fmt_change_test.c b/hdmi_in_test/src/fmt_change_test.c
new file mode 100644
index 0000000..6651c6d
--- /dev/null
+++ b/hdmi_in_test/src/fmt_change_test.c
@@ -0,0 +1,811 @@
+/*
+ * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
+ * Not a Contribution.
+ *
+ * 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.
+ */
+
+/* Test app to capture event updates from kernel */
+/*#define LOG_NDEBUG 0*/
+#include <getopt.h>
+#include <fcntl.h>
+#include <linux/netlink.h>
+#include <pthread.h>
+#include <poll.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/prctl.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <utils/Log.h>
+#include <signal.h>
+#include <errno.h>
+#include "qahw_api.h"
+#include "qahw_defs.h"
+
+/* add local define to prevent compilation errors on other platforms */
+#ifndef AUDIO_DEVICE_IN_HDMI_ARC
+#define AUDIO_DEVICE_IN_HDMI_ARC (AUDIO_DEVICE_BIT_IN | 0x8000000)
+#endif
+
+static int sock_event_fd = -1;
+
+void *context = NULL;
+FILE * log_file = NULL;
+volatile bool stop_test = false;
+volatile bool stop_record = false;
+volatile bool record_active = false;
+
+#define HDMI_SYS_PATH "/sys/devices/platform/soc/78b7000.i2c/i2c-3/3-0064/"
+const char hdmi_in_audio_sys_path[] = HDMI_SYS_PATH "link_on0";
+const char hdmi_in_power_on_sys_path[] = HDMI_SYS_PATH "power_on";
+const char hdmi_in_audio_path_sys_path[] = HDMI_SYS_PATH "audio_path";
+const char hdmi_in_arc_enable_sys_path[] = HDMI_SYS_PATH "arc_enable";
+
+const char hdmi_in_audio_state_sys_path[] = HDMI_SYS_PATH "audio_state";
+const char hdmi_in_audio_format_sys_path[] = HDMI_SYS_PATH "audio_format";
+const char hdmi_in_audio_sample_rate_sys_path[] = HDMI_SYS_PATH "audio_rate";
+const char hdmi_in_audio_layout_sys_path[] = HDMI_SYS_PATH "audio_layout";
+
+#define SPDIF_SYS_PATH "/sys/devices/platform/soc/soc:qcom,msm-dai-q6-spdif-pri-tx/"
+const char spdif_in_audio_state_sys_path[] = SPDIF_SYS_PATH "audio_state";
+const char spdif_in_audio_format_sys_path[] = SPDIF_SYS_PATH "audio_format";
+const char spdif_in_audio_sample_rate_sys_path[] = SPDIF_SYS_PATH "audio_rate";
+
+#define SPDIF_ARC_SYS_PATH "/sys/devices/platform/soc/soc:qcom,msm-dai-q6-spdif-sec-tx/"
+const char spdif_arc_in_audio_state_sys_path[] = SPDIF_ARC_SYS_PATH "audio_state";
+const char spdif_arc_in_audio_format_sys_path[] = SPDIF_ARC_SYS_PATH "audio_format";
+const char spdif_arc_in_audio_sample_rate_sys_path[] = SPDIF_ARC_SYS_PATH "audio_rate";
+
+#define ID_RIFF 0x46464952
+#define ID_WAVE 0x45564157
+#define ID_FMT  0x20746d66
+#define ID_DATA 0x61746164
+
+#define FORMAT_PCM 1
+
+struct wav_header {
+    uint32_t riff_id;
+    uint32_t riff_sz;
+    uint32_t riff_fmt;
+    uint32_t fmt_id;
+    uint32_t fmt_sz;
+    uint16_t audio_format;
+    uint16_t num_channels;
+    uint32_t sample_rate;
+    uint32_t byte_rate;       /* sample_rate * num_channels * bps / 8 */
+    uint16_t block_align;     /* num_channels * bps / 8 */
+    uint16_t bits_per_sample;
+    uint32_t data_id;
+    uint32_t data_sz;
+};
+
+struct test_data {
+    qahw_module_handle_t *qahw_mod_handle;
+    audio_io_handle_t handle;
+    audio_devices_t input_device;
+    double record_length;
+    int rec_cnt;
+
+    char *audio_fmt_chg_text;
+    int audio_fmt_chg_len;
+    pthread_t record_th;
+    pthread_t poll_event_th;
+    pthread_attr_t poll_event_attr;
+
+    int bit_width;
+    audio_input_flags_t flags;
+    audio_config_t config;
+    audio_source_t source;
+
+    int spdif_audio_state;
+    int spdif_audio_mode;
+    int spdif_sample_rate;
+    int spdif_num_channels;
+
+    int hdmi_power_on;
+    int hdmi_audio_path;
+    int hdmi_arc_enable;
+
+    int hdmi_audio_state;
+    int hdmi_audio_mode;
+    int hdmi_audio_layout;
+    int hdmi_sample_rate;
+    int hdmi_num_channels;
+
+    int spdif_arc_audio_state;
+    int spdif_arc_audio_mode;
+    int spdif_arc_sample_rate;
+    int spdif_arc_num_channels;
+
+    audio_devices_t new_input_device;
+
+    audio_devices_t act_input_device; /* HDMI might use I2S and SPDIF */
+
+    int act_audio_state;    /* audio active */
+    int act_audio_mode;     /* 0=LPCM, 1=Compr */
+    int act_sample_rate;    /* transmission sample rate */
+    int act_num_channels;   /* transmission channels */
+};
+
+struct test_data tdata;
+
+void stop_signal_handler(int signal)
+{
+   stop_test = true;
+}
+
+void *start_input(void *thread_param) {
+    int rc = 0, ret = 0, count = 0;
+    ssize_t bytes_read = -1;
+    char file_name[256] = "/data/rec";
+    int data_sz = 0, name_len = strlen(file_name);
+    qahw_in_buffer_t in_buf;
+
+    qahw_module_handle_t *qahw_mod_handle = tdata.qahw_mod_handle;
+
+    /* convert/check params before use */
+    tdata.config.sample_rate = tdata.act_sample_rate;
+
+    if (tdata.act_audio_mode) {
+        tdata.config.format = AUDIO_FORMAT_IEC61937;
+        tdata.flags = QAHW_INPUT_FLAG_COMPRESS | QAHW_INPUT_FLAG_PASSTHROUGH;
+    } else {
+        if (tdata.bit_width == 32)
+            tdata.config.format = AUDIO_FORMAT_PCM_8_24_BIT;
+        else if (tdata.bit_width == 24)
+            tdata.config.format = AUDIO_FORMAT_PCM_24_BIT_PACKED;
+        else
+            tdata.config.format = AUDIO_FORMAT_PCM_16_BIT;
+        tdata.flags = 0;
+    }
+
+    switch (tdata.act_num_channels) {
+    case 2:
+        tdata.config.channel_mask = AUDIO_CHANNEL_IN_STEREO;
+        break;
+    case 8:
+        tdata.config.channel_mask = AUDIO_CHANNEL_INDEX_MASK_8;
+        break;
+    default:
+        fprintf(log_file,
+            "ERROR :::: channel count %d not supported\n",
+            tdata.act_num_channels);
+        pthread_exit(0);
+    }
+    tdata.config.frame_count = 0;
+
+    /* Open audio input stream */
+    qahw_stream_handle_t* in_handle = NULL;
+
+    rc = qahw_open_input_stream(qahw_mod_handle, tdata.handle,
+        tdata.act_input_device, &tdata.config, &in_handle, tdata.flags,
+        "input_stream", tdata.source);
+    if (rc) {
+        fprintf(log_file,
+            "ERROR :::: Could not open input stream, handle(%d)\n",
+            tdata.handle);
+        pthread_exit(0);
+    }
+
+    /* Get buffer size to get upper bound on data to read from the HAL */
+    size_t buffer_size = qahw_in_get_buffer_size(in_handle);
+    char *buffer = (char *) calloc(1, buffer_size);
+    size_t written_size;
+    if (buffer == NULL) {
+        fprintf(log_file, "calloc failed!!, handle(%d)\n", tdata.handle);
+        pthread_exit(0);
+    }
+
+    fprintf(log_file, " input opened, buffer  %p, size %zu, handle(%d)\n", buffer,
+        buffer_size, tdata.handle);
+
+    /* set profile for the recording session */
+    qahw_in_set_parameters(in_handle, "audio_stream_profile=record_unprocessed");
+
+    if (audio_is_linear_pcm(tdata.config.format))
+        snprintf(file_name + name_len, sizeof(file_name) - name_len, "%d.wav",
+            tdata.rec_cnt);
+    else
+        snprintf(file_name + name_len, sizeof(file_name) - name_len, "%d.raw",
+            tdata.rec_cnt);
+
+    tdata.rec_cnt++;
+
+    FILE *fd = fopen(file_name, "w");
+    if (fd == NULL) {
+        fprintf(log_file, "File open failed\n");
+        free(buffer);
+        pthread_exit(0);
+    }
+
+    int bps = 16;
+
+    switch (tdata.config.format) {
+    case AUDIO_FORMAT_PCM_24_BIT_PACKED:
+        bps = 24;
+        break;
+    case AUDIO_FORMAT_PCM_8_24_BIT:
+    case AUDIO_FORMAT_PCM_32_BIT:
+        bps = 32;
+        break;
+    case AUDIO_FORMAT_PCM_16_BIT:
+    default:
+        bps = 16;
+    }
+
+    struct wav_header hdr;
+    hdr.riff_id = ID_RIFF;
+    hdr.riff_sz = 0;
+    hdr.riff_fmt = ID_WAVE;
+    hdr.fmt_id = ID_FMT;
+    hdr.fmt_sz = 16;
+    hdr.audio_format = FORMAT_PCM;
+    hdr.num_channels = tdata.act_num_channels;
+    hdr.sample_rate = tdata.config.sample_rate;
+    hdr.byte_rate = hdr.sample_rate * hdr.num_channels * (bps / 8);
+    hdr.block_align = hdr.num_channels * (bps / 8);
+    hdr.bits_per_sample = bps;
+    hdr.data_id = ID_DATA;
+    hdr.data_sz = 0;
+    if (audio_is_linear_pcm(tdata.config.format))
+        fwrite(&hdr, 1, sizeof(hdr), fd);
+
+    memset(&in_buf, 0, sizeof(qahw_in_buffer_t));
+    while (true && !stop_record) {
+        in_buf.buffer = buffer;
+        in_buf.bytes = buffer_size;
+        bytes_read = qahw_in_read(in_handle, &in_buf);
+
+        written_size = fwrite(in_buf.buffer, 1, bytes_read, fd);
+        if (written_size < bytes_read) {
+            printf("Error in fwrite(%d)=%s\n", ferror(fd),
+                strerror(ferror(fd)));
+            break;
+        }
+        data_sz += bytes_read;
+    }
+
+    if (audio_is_linear_pcm(tdata.config.format)) {
+        /* update lengths in header */
+        hdr.data_sz = data_sz;
+        hdr.riff_sz = data_sz + 44 - 8;
+        fseek(fd, 0, SEEK_SET);
+        fwrite(&hdr, 1, sizeof(hdr), fd);
+    }
+    free(buffer);
+    fclose(fd);
+    fd = NULL;
+
+    fprintf(log_file, " closing input, handle(%d), written %d bytes", tdata.handle, data_sz);
+
+    /* Close input stream and device. */
+    rc = qahw_in_standby(in_handle);
+    if (rc) {
+        fprintf(log_file, "in standby failed %d, handle(%d)\n", rc,
+            tdata.handle);
+    }
+
+    rc = qahw_close_input_stream(in_handle);
+    if (rc) {
+        fprintf(log_file, "could not close input stream %d, handle(%d)\n", rc,
+            tdata.handle);
+    }
+
+    fprintf(log_file,
+        "\n\n The audio recording has been saved to %s.\n"
+        "The audio data has the  following characteristics:\n Sample rate: %i\n Format: %d\n "
+        "Num channels: %i, handle(%d)\n\n", file_name,
+        tdata.config.sample_rate, tdata.config.format, tdata.act_num_channels,
+        tdata.handle);
+
+    return NULL;
+}
+
+void start_rec_thread(void)
+{
+    int ret = 0;
+
+    stop_record = false;
+    record_active = true;
+
+    fprintf(log_file, "\n Create record thread \n");
+    ret = pthread_create(&tdata.record_th, NULL, start_input, (void *)&tdata);
+    if (ret) {
+        fprintf(log_file, " Failed to create record thread\n");
+        exit(1);
+   }
+}
+
+void stop_rec_thread(void)
+{
+    if (record_active) {
+        record_active = false;
+        stop_record = true;
+        fprintf(log_file, "\n Stop record thread \n");
+        pthread_join(tdata.record_th, NULL);
+    }
+}
+
+
+void read_data_from_fd(const char* path, int *value)
+{
+    int fd = -1;
+    char buf[16];
+    int ret;
+
+    fd = open(path, O_RDONLY, 0);
+    if (fd < 0) {
+        ALOGE("Unable open fd for file %s", path);
+        return;
+    }
+
+    ret = read(fd, buf, 15);
+    if (ret < 0) {
+        ALOGE("File %s Data is empty", path);
+        close(fd);
+        return;
+    }
+
+    buf[ret] = '\0';
+    *value = atoi(buf);
+    close(fd);
+}
+
+void get_input_status()
+{
+    switch (tdata.input_device) {
+    case AUDIO_DEVICE_IN_SPDIF:
+        read_data_from_fd(spdif_in_audio_state_sys_path, &tdata.spdif_audio_state);
+        read_data_from_fd(spdif_in_audio_format_sys_path, &tdata.spdif_audio_mode);
+        read_data_from_fd(spdif_in_audio_sample_rate_sys_path, &tdata.spdif_sample_rate);
+        tdata.spdif_num_channels = 2;
+        tdata.new_input_device = AUDIO_DEVICE_IN_SPDIF;
+
+        fprintf(log_file, "spdif audio_state: %d, audio_format: %d, sample_rate: %d, num_channels: %d\n",
+            tdata.spdif_audio_state, tdata.spdif_audio_mode, tdata.spdif_sample_rate, tdata.spdif_num_channels);
+        break;
+    case AUDIO_DEVICE_IN_HDMI:
+        read_data_from_fd(hdmi_in_power_on_sys_path, &tdata.hdmi_power_on);
+        read_data_from_fd(hdmi_in_audio_path_sys_path, &tdata.hdmi_audio_path);
+        read_data_from_fd(hdmi_in_arc_enable_sys_path, &tdata.hdmi_arc_enable);
+
+        read_data_from_fd(hdmi_in_audio_state_sys_path, &tdata.hdmi_audio_state);
+        read_data_from_fd(hdmi_in_audio_format_sys_path, &tdata.hdmi_audio_mode);
+        read_data_from_fd(hdmi_in_audio_sample_rate_sys_path, &tdata.hdmi_sample_rate);
+        read_data_from_fd(hdmi_in_audio_layout_sys_path, &tdata.hdmi_audio_layout);
+        if (tdata.hdmi_audio_layout)
+            tdata.hdmi_num_channels = 8;
+        else
+            tdata.hdmi_num_channels = 2;
+        /* todo: read ch_count, ch_alloc */
+
+        read_data_from_fd(spdif_arc_in_audio_state_sys_path, &tdata.spdif_arc_audio_state);
+        read_data_from_fd(spdif_arc_in_audio_format_sys_path, &tdata.spdif_arc_audio_mode);
+        read_data_from_fd(spdif_arc_in_audio_sample_rate_sys_path, &tdata.spdif_arc_sample_rate);
+        tdata.spdif_arc_num_channels = 2;
+
+        if (tdata.hdmi_arc_enable ||
+            (tdata.hdmi_audio_state && (tdata.hdmi_audio_layout == 0) && tdata.hdmi_audio_mode)) {
+            tdata.new_input_device = AUDIO_DEVICE_IN_HDMI_ARC;
+            fprintf(log_file, "hdmi audio interface SPDIF_ARC\n");
+        } else {
+            tdata.new_input_device = AUDIO_DEVICE_IN_HDMI;
+            fprintf(log_file, "hdmi audio interface MI2S\n");
+        }
+
+        fprintf(log_file, "hdmi audio_state: %d, audio_format: %d, sample_rate: %d, num_channels: %d\n",
+            tdata.hdmi_audio_state, tdata.hdmi_audio_mode, tdata.hdmi_sample_rate, tdata.hdmi_num_channels);
+        fprintf(log_file, "arc  audio_state: %d, audio_format: %d, sample_rate: %d, num_channels: %d\n",
+            tdata.spdif_arc_audio_state, tdata.spdif_arc_audio_mode, tdata.spdif_arc_sample_rate, tdata.spdif_arc_num_channels);
+        break;
+    }
+}
+
+void input_restart_check(void)
+{
+    get_input_status();
+
+    switch (tdata.input_device) {
+    case AUDIO_DEVICE_IN_SPDIF:
+        if ((tdata.act_input_device != tdata.new_input_device) ||
+            (tdata.spdif_audio_state == 2)) {
+            fprintf(log_file, "old       audio_state: %d, audio_format: %d, rate: %d, channels: %d\n",
+                tdata.act_audio_state, tdata.act_audio_mode,
+                tdata.act_sample_rate, tdata.act_num_channels);
+            fprintf(log_file, "new spdif audio_state: %d, audio_format: %d, rate: %d, channels: %d\n",
+                tdata.spdif_audio_state, tdata.spdif_audio_mode,
+                tdata.spdif_sample_rate, tdata.spdif_num_channels);
+
+            stop_rec_thread();
+
+            tdata.act_input_device = AUDIO_DEVICE_IN_SPDIF;
+            tdata.act_audio_state = 1;
+            tdata.act_audio_mode = tdata.spdif_audio_mode;
+            tdata.act_sample_rate = tdata.spdif_sample_rate;
+            tdata.act_num_channels = tdata.spdif_num_channels;
+
+            start_rec_thread();
+        }
+        break;
+    case AUDIO_DEVICE_IN_HDMI:
+        if (tdata.act_input_device != tdata.new_input_device) {
+            stop_rec_thread();
+
+            if (tdata.new_input_device == AUDIO_DEVICE_IN_HDMI) {
+                fprintf(log_file, "old      audio_state: %d, audio_format: %d, rate: %d, channels: %d\n",
+                    tdata.act_audio_state, tdata.act_audio_mode,
+                    tdata.act_sample_rate, tdata.act_num_channels);
+                fprintf(log_file, "new hdmi audio_state: %d, audio_format: %d, rate: %d, channels: %d\n",
+                    tdata.hdmi_audio_state, tdata.hdmi_audio_mode,
+                    tdata.hdmi_sample_rate, tdata.hdmi_num_channels);
+
+                tdata.act_input_device = AUDIO_DEVICE_IN_HDMI;
+                tdata.act_audio_state = tdata.hdmi_audio_state;
+                tdata.act_audio_mode = tdata.hdmi_audio_mode;
+                tdata.act_sample_rate = tdata.hdmi_sample_rate;
+                tdata.act_num_channels = tdata.hdmi_num_channels;
+
+                if (tdata.hdmi_audio_state)
+                    start_rec_thread();
+            } else {
+                tdata.act_input_device = AUDIO_DEVICE_IN_HDMI_ARC;
+                if (tdata.hdmi_arc_enable) {
+                    fprintf(log_file, "old     audio_state: %d, audio_format: %d, rate: %d, channels: %d\n",
+                        tdata.act_audio_state, tdata.act_audio_mode,
+                        tdata.act_sample_rate, tdata.act_num_channels);
+                    fprintf(log_file, "new arc audio_state: %d, audio_format: %d, rate: %d, channels: %d\n",
+                        tdata.spdif_arc_audio_state, tdata.spdif_arc_audio_mode,
+                        tdata.spdif_arc_sample_rate, tdata.spdif_arc_num_channels);
+
+                    tdata.act_audio_state = 1;
+                    tdata.act_audio_mode = tdata.spdif_arc_audio_mode;
+                    tdata.act_sample_rate = tdata.spdif_arc_sample_rate;
+                    tdata.act_num_channels = tdata.spdif_arc_num_channels;
+                } else {
+                    fprintf(log_file, "old      audio_state: %d, audio_format: %d, rate: %d, channels: %d\n",
+                        tdata.act_audio_state, tdata.act_audio_mode,
+                        tdata.act_sample_rate, tdata.act_num_channels);
+                    fprintf(log_file, "new arc (from hdmi) audio_state: %d, audio_format: %d, rate: %d, channels: %d\n",
+                        tdata.hdmi_audio_state, tdata.hdmi_audio_mode,
+                        tdata.hdmi_sample_rate, tdata.hdmi_num_channels);
+
+                    tdata.act_audio_state = 1;
+                    tdata.act_audio_mode = tdata.hdmi_audio_mode;
+                    tdata.act_sample_rate = tdata.hdmi_sample_rate;
+                    tdata.act_num_channels = tdata.hdmi_num_channels;
+                }
+                start_rec_thread();
+            }
+        } else { /* check for change on same audio device */
+            if (tdata.new_input_device == AUDIO_DEVICE_IN_HDMI) {
+                if ((tdata.act_audio_state != tdata.hdmi_audio_state) ||
+                    (tdata.act_audio_mode != tdata.hdmi_audio_mode) ||
+                    (tdata.act_sample_rate != tdata.hdmi_sample_rate) ||
+                    (tdata.act_num_channels != tdata.hdmi_num_channels)) {
+
+                    fprintf(log_file, "old      audio_state: %d, audio_format: %d, rate: %d, channels: %d\n",
+                        tdata.act_audio_state, tdata.act_audio_mode,
+                        tdata.act_sample_rate, tdata.act_num_channels);
+                    fprintf(log_file, "new hdmi audio_state: %d, audio_format: %d, rate: %d, channels: %d\n",
+                        tdata.hdmi_audio_state, tdata.hdmi_audio_mode,
+                        tdata.hdmi_sample_rate, tdata.hdmi_num_channels);
+
+                    stop_rec_thread();
+
+                    tdata.act_audio_state = tdata.hdmi_audio_state;
+                    tdata.act_audio_mode = tdata.hdmi_audio_mode;
+                    tdata.act_sample_rate = tdata.hdmi_sample_rate;
+                    tdata.act_num_channels = tdata.hdmi_num_channels;
+
+                    if (tdata.hdmi_audio_state)
+                        start_rec_thread();
+                    }
+            } else {
+                if (tdata.spdif_arc_audio_state == 2) {
+                    fprintf(log_file, "old     audio_state: %d, audio_format: %d, rate: %d, channels: %d\n",
+                        tdata.act_audio_state, tdata.act_audio_mode,
+                        tdata.act_sample_rate, tdata.act_num_channels);
+                    fprintf(log_file, "new arc audio_state: %d, audio_format: %d, rate: %d, channels: %d\n",
+                        tdata.spdif_arc_audio_state, tdata.spdif_arc_audio_mode,
+                        tdata.spdif_arc_sample_rate, tdata.spdif_arc_num_channels);
+
+                    stop_rec_thread();
+
+                    tdata.act_audio_state = 1;
+                    tdata.act_audio_mode = tdata.spdif_arc_audio_mode;
+                    tdata.act_sample_rate = tdata.spdif_arc_sample_rate;
+                    tdata.act_num_channels = tdata.spdif_arc_num_channels;
+
+                    start_rec_thread();
+                }
+            }
+        }
+        break;
+    }
+}
+
+int poll_event_init()
+{
+    struct sockaddr_nl sock_addr;
+    int sz = (64*1024);
+    int soc;
+
+    memset(&sock_addr, 0, sizeof(sock_addr));
+    sock_addr.nl_family = AF_NETLINK;
+    sock_addr.nl_pid = getpid();
+    sock_addr.nl_groups = 0xffffffff;
+
+    soc = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
+    if (soc < 0) {
+        return 0;
+    }
+
+    setsockopt(soc, SOL_SOCKET, SO_RCVBUFFORCE, &sz, sizeof(sz));
+
+    if (bind(soc, (struct sockaddr*) &sock_addr, sizeof(sock_addr)) < 0) {
+        close(soc);
+        return 0;
+    }
+
+    sock_event_fd = soc;
+
+    return (soc > 0);
+}
+
+void* listen_uevent()
+{
+    char buffer[64*1024];
+    struct pollfd fds;
+    int i, count;
+    int j;
+    char *dev_path = NULL;
+    char *switch_state = NULL;
+    char *switch_name = NULL;
+    int audio_changed;
+
+    input_restart_check();
+
+    while(!stop_test) {
+
+        fds.fd = sock_event_fd;
+        fds.events = POLLIN;
+        fds.revents = 0;
+        i = poll(&fds, 1, 5); /* wait 5 msec */
+
+        if (i > 0 && (fds.revents & POLLIN)) {
+            count = recv(sock_event_fd, buffer, (64*1024), 0 );
+            if (count > 0) {
+                buffer[count] = '\0';
+                audio_changed = 0;
+                j = 0;
+                while(j < count) {
+                    if (strncmp(&buffer[j], "DEVPATH=", 8) == 0) {
+                        dev_path = &buffer[j+8];
+                        j += 8;
+                        continue;
+                    } else if (tdata.input_device == AUDIO_DEVICE_IN_SPDIF) {
+                        if (strncmp(&buffer[j], "PRI_SPDIF_TX=MEDIA_CONFIG_CHANGE", strlen("PRI_SPDIF_TX=MEDIA_CONFIG_CHANGE")) == 0) {
+                            audio_changed = 1;
+                            ALOGI("AUDIO CHANGE EVENT: %s\n", &buffer[j]);
+                            j += strlen("PRI_SPDIF_TX=MEDIA_CONFIG_CHANGE");
+                            continue;
+                        }
+                    } else if (tdata.input_device == AUDIO_DEVICE_IN_HDMI) {
+                        if (strncmp(&buffer[j], "EP92EVT_AUDIO=MEDIA_CONFIG_CHANGE", strlen("EP92EVT_AUDIO=MEDIA_CONFIG_CHANGE")) == 0) {
+                            audio_changed = 1;
+                            ALOGI("AUDIO CHANGE EVENT: %s\n", &buffer[j]);
+                            j += strlen("EP92EVT_AUDIO=MEDIA_CONFIG_CHANGE");
+                            continue;
+                        } else if (strncmp(&buffer[j], "SEC_SPDIF_TX=MEDIA_CONFIG_CHANGE", strlen("SEC_SPDIF_TX=MEDIA_CONFIG_CHANGE")) == 0) {
+                            audio_changed = 1;
+                            ALOGI("AUDIO CHANGE EVENT: %s\n", &buffer[j]);
+                            j += strlen("SEC_SPDIF_TX=MEDIA_CONFIG_CHANGE");
+                            continue;
+                        } else if (strncmp(&buffer[j], "EP92EVT_", 8) == 0) {
+                            ALOGI("EVENT: %s\n", &buffer[j]);
+                            j += 8;
+                            continue;
+                        }
+                    }
+                    j++;
+                }
+
+                if (audio_changed)
+                    input_restart_check();
+            }
+        } else {
+            ALOGV("NO Data\n");
+        }
+    }
+
+    stop_rec_thread();
+}
+
+void fill_default_params(struct test_data *tdata) {
+    memset(tdata, 0, sizeof(struct test_data));
+
+    tdata->input_device = AUDIO_DEVICE_IN_SPDIF;
+    tdata->bit_width = 24;
+    tdata->source = AUDIO_SOURCE_UNPROCESSED;
+    tdata->record_length = 8 /*sec*/;
+
+    tdata->handle = 0x99A;
+}
+
+void usage() {
+    printf(" \n Command \n");
+    printf(" \n fmt_change_test <options>\n");
+    printf(" \n Options\n");
+    printf(" -d  --device <int>                 - see system/media/audio/include/system/audio.h for device values\n");
+    printf("                                      spdif_in 2147549184, hdmi_in 2147483680\n");
+    printf("                                      Optional Argument and Default value is spdif_in\n\n");
+    printf(" -b  --bits  <int>                  - Bitwidth in PCM mode (16, 24 or 32), Default is 24\n\n");
+    printf(" -F  --flags  <int>                 - Integer value of flags to be used for opening input stream\n\n");
+    printf(" -t  --recording-time <in seconds>  - Time duration for the recording\n\n");
+    printf(" -l  --log-file <FILEPATH>          - File path for debug msg, to print\n");
+    printf("                                      on console use stdout or 1 \n\n");
+    printf(" -h  --help                         - Show this help\n\n");
+    printf(" \n Examples \n");
+    printf(" hdmi_in_event_test                          -> start a recording stream with default configurations\n\n");
+    printf(" hdmi_in_event_test -d 2147483680 -t 20      -> start a recording session, with device hdmi_in,\n");
+    printf("                                                record data for 20 secs.\n\n");
+}
+
+static void qti_audio_server_death_notify_cb(void *ctxt) {
+    fprintf(log_file, "qas died\n");
+    fprintf(stderr, "qas died\n");
+    stop_test = true;
+    stop_record = true;
+}
+
+int main(int argc, char* argv[])
+{
+    qahw_module_handle_t *qahw_mod_handle;
+    const  char *mod_name = "audio.primary";
+
+    char log_filename[256] = "stdout";
+    int i;
+    int ret = -1;
+
+    log_file = stdout;
+    fill_default_params(&tdata);
+    struct option long_options[] = {
+        /* These options set a flag. */
+        {"device",          required_argument,    0, 'd'},
+        {"bits",            required_argument,    0, 'b'},
+        {"flags",           required_argument,    0, 'F'},
+        {"recording-time",  required_argument,    0, 't'},
+        {"log-file",        required_argument,    0, 'l'},
+        {"help",            no_argument,          0, 'h'},
+        {0, 0, 0, 0}
+    };
+
+    int opt = 0;
+    int option_index = 0;
+    while ((opt = getopt_long(argc,
+                              argv,
+                              "-d:b:F:t:l:h",
+                              long_options,
+                              &option_index)) != -1) {
+            switch (opt) {
+            case 'd':
+                tdata.input_device = atoll(optarg);
+                break;
+            case 'b':
+                tdata.bit_width = atoll(optarg);
+                break;
+            case 'F':
+                tdata.flags = atoll(optarg);
+                break;
+            case 't':
+                tdata.record_length = atoi(optarg);
+                break;
+            case 'l':
+                snprintf(log_filename, sizeof(log_filename), "%s", optarg);
+                break;
+            case 'h':
+                usage();
+                return 0;
+                break;
+         }
+    }
+    fprintf(log_file, "registering qas callback");
+    qahw_register_qas_death_notify_cb((audio_error_callback)qti_audio_server_death_notify_cb, context);
+
+    switch (tdata.input_device) {
+    case AUDIO_DEVICE_IN_SPDIF:
+        break;
+    case AUDIO_DEVICE_IN_HDMI:
+        break;
+    default:
+        fprintf(log_file, "device %d not supported\n", tdata.input_device);
+        return -1;
+    }
+
+    switch (tdata.bit_width) {
+    case 16:
+    case 24:
+    case 32:
+        break;
+    default:
+        fprintf(log_file, "bitwidth %d not supported\n", tdata.bit_width);
+        return -1;
+    }
+
+    qahw_mod_handle = qahw_load_module(mod_name);
+    if(qahw_mod_handle == NULL) {
+        fprintf(log_file, " qahw_load_module failed");
+        return -1;
+    }
+    fprintf(log_file, " Starting audio recording test. \n");
+    if (strcasecmp(log_filename, "stdout") && strcasecmp(log_filename, "1")) {
+        if ((log_file = fopen(log_filename,"wb"))== NULL) {
+            fprintf(stderr, "Cannot open log file %s\n", log_filename);
+            /* continue to log to std out */
+            log_file = stdout;
+        }
+    }
+
+    tdata.qahw_mod_handle = qahw_mod_handle;
+
+    /* Register the SIGINT to close the App properly */
+    if (signal(SIGINT, stop_signal_handler) == SIG_ERR)
+        fprintf(log_file, "Failed to register SIGINT:%d\n", errno);
+
+    /* Register the SIGTERM to close the App properly */
+    if (signal(SIGTERM, stop_signal_handler) == SIG_ERR)
+        fprintf(log_file, "Failed to register SIGTERM:%d\n", errno);
+
+    time_t start_time = time(0);
+    double time_elapsed = 0;
+
+    pthread_attr_init(&tdata.poll_event_attr);
+    pthread_attr_setdetachstate(&tdata.poll_event_attr, PTHREAD_CREATE_JOINABLE);
+    poll_event_init();
+    pthread_create(&tdata.poll_event_th, &tdata.poll_event_attr,
+                       (void *) listen_uevent, NULL);
+
+    while(true && !stop_test) {
+        time_elapsed = difftime(time(0), start_time);
+        if (tdata.record_length && (time_elapsed > tdata.record_length)) {
+            fprintf(log_file, "\n Test completed.\n");
+            stop_test = true;
+            break;
+        }
+    }
+
+    fprintf(log_file, "\n Stop test \n");
+
+    pthread_join(tdata.poll_event_th, NULL);
+
+    fprintf(log_file, "\n Unload HAL\n");
+
+    ret = qahw_unload_module(qahw_mod_handle);
+    if (ret) {
+        fprintf(log_file, "could not unload hal %d\n", ret);
+    }
+
+    fprintf(log_file, "Done with hal record test\n");
+    if (log_file != stdout) {
+        if (log_file) {
+          fclose(log_file);
+          log_file = NULL;
+        }
+    }
+
+    return 0;
+}
diff --git a/post_proc/Android.mk b/post_proc/Android.mk
index 5da769c..4441ab0 100644
--- a/post_proc/Android.mk
+++ b/post_proc/Android.mk
@@ -39,6 +39,10 @@
     LOCAL_SRC_FILES += asphere.c
 endif
 
+ifeq ($(strip $(AUDIO_FEATURE_ENABLED_INSTANCE_ID)), true)
+    LOCAL_CFLAGS += -DINSTANCE_ID_ENABLED
+endif
+
 LOCAL_CFLAGS+= -O2 -fvisibility=hidden
 
 ifneq ($(strip $(AUDIO_FEATURE_DISABLED_DTS_EAGLE)),true)
@@ -110,10 +114,6 @@
 LOCAL_CFLAGS += -DHW_ACC_HPX
 endif
 
-ifeq ($(strip $(AUDIO_FEATURE_ENABLED_INSTANCE_ID)), true)
-    LOCAL_CFLAGS += -DINSTANCE_ID_ENABLED
-endif
-
 LOCAL_MODULE:= libhwacceffectswrapper
 LOCAL_VENDOR_MODULE := true
 
diff --git a/qahw/inc/qahw.h b/qahw/inc/qahw.h
index e91fd00..dd5b403 100644
--- a/qahw/inc/qahw.h
+++ b/qahw/inc/qahw.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
  * Not a Contribution.
  *
  * Copyright (C) 2011 The Android Open Source Project *
@@ -463,6 +463,13 @@
 /* Release an audio patch */
 int qahw_release_audio_patch_l(qahw_module_handle_t *hw_module,
                         audio_patch_handle_t handle);
+
+/* API to set loopback stream specific config parameters. */
+int qahw_loopback_set_param_data_l(qahw_module_handle_t *hw_module,
+                                   audio_patch_handle_t handle,
+                                   qahw_loopback_param_id param_id,
+                                   qahw_loopback_param_payload *payload);
+
 /* Fills the list of supported attributes for a given audio port.
  * As input, "port" contains the information (type, role, address etc...)
  * needed by the HAL to identify the port.
diff --git a/qahw/inc/qahw_defs.h b/qahw/inc/qahw_defs.h
index 4e7faff..755553b 100644
--- a/qahw/inc/qahw_defs.h
+++ b/qahw/inc/qahw_defs.h
@@ -417,6 +417,14 @@
     QAHW_PARAM_LICENSE_PARAMS,
 } qahw_param_id;
 
+typedef union {
+    struct qahw_out_render_window_param render_window_params;
+} qahw_loopback_param_payload;
+
+typedef enum {
+    QAHW_PARAM_LOOPBACK_RENDER_WINDOW /* PARAM to set render window */
+} qahw_loopback_param_id;
+
 __END_DECLS
 
 #endif  // QTI_AUDIO_HAL_DEFS_H
diff --git a/qahw/src/qahw.c b/qahw/src/qahw.c
index 0c00158..126f794 100644
--- a/qahw/src/qahw.c
+++ b/qahw/src/qahw.c
@@ -69,6 +69,10 @@
                                       qahw_param_id param_id,
                                       qahw_param_payload *payload);
 
+typedef int (*qahwi_loopback_set_param_data_t)(audio_patch_handle_t patch_handle,
+                                               qahw_param_id param_id,
+                                               qahw_param_payload *payload);
+
 typedef struct {
     audio_hw_device_t *audio_device;
     char module_name[MAX_MODULE_NAME_LENGTH];
@@ -80,6 +84,7 @@
     const hw_module_t* module;
     qahwi_get_param_data_t qahwi_get_param_data;
     qahwi_set_param_data_t qahwi_set_param_data;
+    qahwi_loopback_set_param_data_t qahwi_loopback_set_param_data;
 } qahw_module_t;
 
 typedef struct {
@@ -1438,6 +1443,34 @@
      return ret;
 }
 
+int qahw_loopback_set_param_data_l(qahw_module_handle_t *hw_module,
+                                   audio_patch_handle_t handle,
+                                   qahw_loopback_param_id param_id,
+                                   qahw_loopback_param_payload *payload)
+
+{
+    int ret = -EINVAL;
+    qahw_module_t *qahw_module = (qahw_module_t *)hw_module;
+
+    if (!payload) {
+        ALOGE("%s:: invalid param", __func__);
+        goto exit;
+    }
+
+    if (qahw_module->qahwi_loopback_set_param_data) {
+        ret = qahw_module->qahwi_loopback_set_param_data(handle,
+                                                         param_id,
+                                                         (void *)payload);
+    } else {
+        ret = -ENOSYS;
+        ALOGE("%s not supported\n", __func__);
+    }
+
+exit:
+    return ret;
+
+}
+
 /* Fills the list of supported attributes for a given audio port.
  * As input, "port" contains the information (type, role, address etc...)
  * needed by the HAL to identify the port.
@@ -1889,6 +1922,12 @@
     if (!qahw_module->qahwi_set_param_data)
          ALOGD("%s::qahwi_set_param_data api is not defined\n",__func__);
 
+    qahw_module->qahwi_loopback_set_param_data = (qahwi_loopback_set_param_data_t)
+                                                  dlsym(module->dso,
+                                                  "qahwi_loopback_set_param_data");
+    if (!qahw_module->qahwi_loopback_set_param_data)
+         ALOGD("%s::qahwi_loopback_set_param_data api is not defined\n", __func__);
+
     if (!qahw_list_count)
         list_init(&qahw_module_list);
     qahw_list_count++;
diff --git a/qahw_api/inc/qahw_api.h b/qahw_api/inc/qahw_api.h
index 0aa3c79..823c6bb 100644
--- a/qahw_api/inc/qahw_api.h
+++ b/qahw_api/inc/qahw_api.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
  * Not a Contribution.
  *
  * Copyright (C) 2011 The Android Open Source Project *
@@ -459,6 +459,13 @@
 /* Release an audio patch */
 int qahw_release_audio_patch(qahw_module_handle_t *hw_module,
                         audio_patch_handle_t handle);
+
+/* API to set loopback stream specific config parameters */
+int qahw_loopback_set_param_data(qahw_module_handle_t *hw_module,
+                                 audio_patch_handle_t handle,
+                                 qahw_loopback_param_id param_id,
+                                 qahw_loopback_param_payload *payload);
+
 /* Fills the list of supported attributes for a given audio port.
  * As input, "port" contains the information (type, role, address etc...)
  * needed by the HAL to identify the port.
diff --git a/qahw_api/inc/qahw_defs.h b/qahw_api/inc/qahw_defs.h
index c6d42ca..7c01c57 100644
--- a/qahw_api/inc/qahw_defs.h
+++ b/qahw_api/inc/qahw_defs.h
@@ -399,6 +399,15 @@
     QAHW_PARAM_LICENSE_PARAMS,
 } qahw_param_id;
 
+
+typedef union {
+    struct qahw_out_render_window_param render_window_params;
+} qahw_loopback_param_payload;
+
+typedef enum {
+    QAHW_PARAM_LOOPBACK_RENDER_WINDOW /* PARAM to set render window */
+} qahw_loopback_param_id;
+
 __END_DECLS
 
 #endif  // QTI_AUDIO_HAL_DEFS_H
diff --git a/qahw_api/src/qahw_api.cpp b/qahw_api/src/qahw_api.cpp
index cbd9041..f1c75f4 100644
--- a/qahw_api/src/qahw_api.cpp
+++ b/qahw_api/src/qahw_api.cpp
@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2016-2017, The Linux Foundation. All rights reserved.
+* Copyright (c) 2016-2018, The Linux Foundation. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
@@ -915,6 +915,15 @@
     }
 }
 
+int qahw_loopback_set_param_data(qahw_module_handle_t *hw_module __unused,
+                                 audio_patch_handle_t handle __unused,
+                                 qahw_loopback_param_id param_id __unused,
+                                 qahw_loopback_param_payload *payload __unused)
+{
+    ALOGD("%d:%s", __LINE__, __func__);
+    return -ENOSYS;
+}
+
 int qahw_get_audio_port(qahw_module_handle_t *hw_module,
                       struct audio_port *port)
 {
@@ -1699,6 +1708,15 @@
     return qahw_release_audio_patch_l(hw_module, handle);
 }
 
+int qahw_loopback_set_param_data(qahw_module_handle_t *hw_module,
+                                 audio_patch_handle_t handle,
+                                 qahw_loopback_param_id param_id,
+                                 qahw_loopback_param_payload *payload)
+{
+    ALOGV("%d:%s\n", __LINE__, __func__);
+    return qahw_loopback_set_param_data_l(hw_module, handle, param_id, payload);
+}
+
 int qahw_get_audio_port(qahw_module_handle_t *hw_module,
                       struct audio_port *port)
 {