diff --git a/hal_mpq/Android.mk b/hal_mpq/Android.mk
index 338ee40..24fca4e 100644
--- a/hal_mpq/Android.mk
+++ b/hal_mpq/Android.mk
@@ -10,6 +10,7 @@
 
 LOCAL_SRC_FILES := \
 	audio_hw.c \
+	audio_stream_out.c \
 	$(AUDIO_PLATFORM)/hw_info.c \
 	$(AUDIO_PLATFORM)/platform.c
 
diff --git a/hal_mpq/audio_hw.c b/hal_mpq/audio_hw.c
index 8df46be..fb83245 100644
--- a/hal_mpq/audio_hw.c
+++ b/hal_mpq/audio_hw.c
@@ -40,135 +40,26 @@
 #include <cutils/str_parms.h>
 #include <cutils/properties.h>
 #include <cutils/atomic.h>
-#include <cutils/sched_policy.h>
 
 #include <hardware/audio_effect.h>
-#include <system/thread_defs.h>
 #include <audio_effects/effect_aec.h>
 #include <audio_effects/effect_ns.h>
 #include "audio_hw.h"
 #include "platform_api.h"
 #include <platform.h>
 
-#include "sound/compress_params.h"
-
-#define COMPRESS_OFFLOAD_FRAGMENT_SIZE (32 * 1024)
-#define COMPRESS_OFFLOAD_NUM_FRAGMENTS 4
-/* ToDo: Check and update a proper value in msec */
-#define COMPRESS_OFFLOAD_PLAYBACK_LATENCY 96
-#define COMPRESS_PLAYBACK_VOLUME_MAX 0x2000
-
-struct pcm_config pcm_config_deep_buffer = {
-    .channels = 2,
-    .rate = DEFAULT_OUTPUT_SAMPLING_RATE,
-    .period_size = DEEP_BUFFER_OUTPUT_PERIOD_SIZE,
-    .period_count = DEEP_BUFFER_OUTPUT_PERIOD_COUNT,
-    .format = PCM_FORMAT_S16_LE,
-    .start_threshold = DEEP_BUFFER_OUTPUT_PERIOD_SIZE / 4,
-    .stop_threshold = INT_MAX,
-    .avail_min = DEEP_BUFFER_OUTPUT_PERIOD_SIZE / 4,
-};
-
-struct pcm_config pcm_config_low_latency = {
-    .channels = 2,
-    .rate = DEFAULT_OUTPUT_SAMPLING_RATE,
-    .period_size = LOW_LATENCY_OUTPUT_PERIOD_SIZE,
-    .period_count = LOW_LATENCY_OUTPUT_PERIOD_COUNT,
-    .format = PCM_FORMAT_S16_LE,
-    .start_threshold = LOW_LATENCY_OUTPUT_PERIOD_SIZE / 4,
-    .stop_threshold = INT_MAX,
-    .avail_min = LOW_LATENCY_OUTPUT_PERIOD_SIZE / 4,
-};
-
-struct pcm_config pcm_config_hdmi_multi = {
-    .channels = HDMI_MULTI_DEFAULT_CHANNEL_COUNT, /* changed when the stream is opened */
-    .rate = DEFAULT_OUTPUT_SAMPLING_RATE, /* changed when the stream is opened */
-    .period_size = HDMI_MULTI_PERIOD_SIZE,
-    .period_count = HDMI_MULTI_PERIOD_COUNT,
-    .format = PCM_FORMAT_S16_LE,
-    .start_threshold = 0,
-    .stop_threshold = INT_MAX,
-    .avail_min = 0,
-};
-
 struct pcm_config pcm_config_audio_capture = {
     .channels = 2,
     .period_count = AUDIO_CAPTURE_PERIOD_COUNT,
     .format = PCM_FORMAT_S16_LE,
 };
 
-const char * const use_case_table[AUDIO_USECASE_MAX] = {
-    [USECASE_AUDIO_PLAYBACK_DEEP_BUFFER] = "deep-buffer-playback",
-    [USECASE_AUDIO_PLAYBACK_LOW_LATENCY] = "low-latency-playback",
-    [USECASE_AUDIO_PLAYBACK_MULTI_CH] = "multi-channel-playback",
-    [USECASE_AUDIO_PLAYBACK_OFFLOAD] = "compress-offload-playback",
-    [USECASE_AUDIO_RECORD] = "audio-record",
-    [USECASE_AUDIO_RECORD_COMPRESS] = "audio-record-compress",
-    [USECASE_AUDIO_RECORD_LOW_LATENCY] = "low-latency-record",
-    [USECASE_AUDIO_RECORD_FM_VIRTUAL] = "fm-virtual-record",
-    [USECASE_AUDIO_PLAYBACK_FM] = "play-fm",
-    [USECASE_VOICE_CALL] = "voice-call",
-
-    [USECASE_VOICE2_CALL] = "voice2-call",
-    [USECASE_VOLTE_CALL] = "volte-call",
-    [USECASE_QCHAT_CALL] = "qchat-call",
-    [USECASE_COMPRESS_VOIP_CALL] = "compress-voip-call",
-    [USECASE_INCALL_REC_UPLINK] = "incall-rec-uplink",
-    [USECASE_INCALL_REC_DOWNLINK] = "incall-rec-downlink",
-    [USECASE_INCALL_REC_UPLINK_AND_DOWNLINK] = "incall-rec-uplink-and-downlink",
-    [USECASE_INCALL_MUSIC_UPLINK] = "incall_music_uplink",
-    [USECASE_INCALL_MUSIC_UPLINK2] = "incall_music_uplink2",
-    [USECASE_AUDIO_SPKR_CALIB_RX] = "spkr-rx-calib",
-    [USECASE_AUDIO_SPKR_CALIB_TX] = "spkr-vi-record",
-};
-
-
-#define STRING_TO_ENUM(string) { #string, string }
-
-struct string_to_enum {
-    const char *name;
-    uint32_t value;
-};
-
-static const struct string_to_enum out_channels_name_to_enum_table[] = {
-    STRING_TO_ENUM(AUDIO_CHANNEL_OUT_STEREO),
-    STRING_TO_ENUM(AUDIO_CHANNEL_OUT_5POINT1),
-    STRING_TO_ENUM(AUDIO_CHANNEL_OUT_7POINT1),
-};
-
 static struct audio_device *adev = NULL;
 static pthread_mutex_t adev_init_lock;
 static unsigned int audio_device_ref_count;
 
 static int set_voice_volume_l(struct audio_device *adev, float volume);
 
-static bool is_supported_format(audio_format_t format)
-{
-    if (format == AUDIO_FORMAT_MP3 ||
-            format == AUDIO_FORMAT_AAC)
-        return true;
-
-    return false;
-}
-
-static int get_snd_codec_id(audio_format_t format)
-{
-    int id = 0;
-
-    switch (format) {
-    case AUDIO_FORMAT_MP3:
-        id = SND_AUDIOCODEC_MP3;
-        break;
-    case AUDIO_FORMAT_AAC:
-        id = SND_AUDIOCODEC_AAC;
-        break;
-    default:
-        ALOGE("%s: Unsupported audio format", __func__);
-    }
-
-    return id;
-}
-
 int enable_audio_route(struct audio_device *adev,
                               struct audio_usecase *usecase,
                               bool update_mixer)
@@ -483,34 +374,6 @@
     return ret;
 }
 
-/* must be called with hw device mutex locked */
-static int read_hdmi_channel_masks(struct stream_out *out)
-{
-    int ret = 0;
-    int channels = platform_edid_get_max_channels(out->dev->platform);
-
-    switch (channels) {
-        /*
-         * Do not handle stereo output in Multi-channel cases
-         * Stereo case is handled in normal playback path
-         */
-    case 6:
-        ALOGV("%s: HDMI supports 5.1", __func__);
-        out->supported_channel_masks[0] = AUDIO_CHANNEL_OUT_5POINT1;
-        break;
-    case 8:
-        ALOGV("%s: HDMI supports 5.1 and 7.1 channels", __func__);
-        out->supported_channel_masks[0] = AUDIO_CHANNEL_OUT_5POINT1;
-        out->supported_channel_masks[1] = AUDIO_CHANNEL_OUT_7POINT1;
-        break;
-    default:
-        ALOGE("HDMI does not support multi channel playback");
-        ret = -ENOSYS;
-        break;
-    }
-    return ret;
-}
-
 static audio_usecase_t get_voice_usecase_id_from_list(struct audio_device *adev)
 {
     struct audio_usecase *usecase;
@@ -751,327 +614,6 @@
     return ret;
 }
 
-/* must be called with out->lock locked */
-static int send_offload_cmd_l(struct stream_out* out, int command)
-{
-    struct offload_cmd *cmd = (struct offload_cmd *)calloc(1, sizeof(struct offload_cmd));
-
-    ALOGVV("%s %d", __func__, command);
-
-    cmd->cmd = command;
-    list_add_tail(&out->offload_cmd_list, &cmd->node);
-    pthread_cond_signal(&out->offload_cond);
-    return 0;
-}
-
-/* must be called iwth out->lock locked */
-static void stop_compressed_output_l(struct stream_out *out)
-{
-    out->offload_state = OFFLOAD_STATE_IDLE;
-    out->playback_started = 0;
-    out->send_new_metadata = 1;
-    if (out->compr != NULL) {
-        compress_stop(out->compr);
-        while (out->offload_thread_blocked) {
-            pthread_cond_wait(&out->cond, &out->lock);
-        }
-    }
-}
-
-static void *offload_thread_loop(void *context)
-{
-    struct stream_out *out = (struct stream_out *) context;
-    struct listnode *item;
-
-    out->offload_state = OFFLOAD_STATE_IDLE;
-    out->playback_started = 0;
-
-    setpriority(PRIO_PROCESS, 0, ANDROID_PRIORITY_AUDIO);
-    set_sched_policy(0, SP_FOREGROUND);
-    prctl(PR_SET_NAME, (unsigned long)"Offload Callback", 0, 0, 0);
-
-    ALOGV("%s", __func__);
-    pthread_mutex_lock(&out->lock);
-    for (;;) {
-        struct offload_cmd *cmd = NULL;
-        stream_callback_event_t event;
-        bool send_callback = false;
-
-        ALOGVV("%s offload_cmd_list %d out->offload_state %d",
-              __func__, list_empty(&out->offload_cmd_list),
-              out->offload_state);
-        if (list_empty(&out->offload_cmd_list)) {
-            ALOGV("%s SLEEPING", __func__);
-            pthread_cond_wait(&out->offload_cond, &out->lock);
-            ALOGV("%s RUNNING", __func__);
-            continue;
-        }
-
-        item = list_head(&out->offload_cmd_list);
-        cmd = node_to_item(item, struct offload_cmd, node);
-        list_remove(item);
-
-        ALOGVV("%s STATE %d CMD %d out->compr %p",
-               __func__, out->offload_state, cmd->cmd, out->compr);
-
-        if (cmd->cmd == OFFLOAD_CMD_EXIT) {
-            free(cmd);
-            break;
-        }
-
-        if (out->compr == NULL) {
-            ALOGE("%s: Compress handle is NULL", __func__);
-            pthread_cond_signal(&out->cond);
-            continue;
-        }
-        out->offload_thread_blocked = true;
-        pthread_mutex_unlock(&out->lock);
-        send_callback = false;
-        switch(cmd->cmd) {
-        case OFFLOAD_CMD_WAIT_FOR_BUFFER:
-            compress_wait(out->compr, -1);
-            send_callback = true;
-            event = STREAM_CBK_EVENT_WRITE_READY;
-            break;
-        case OFFLOAD_CMD_PARTIAL_DRAIN:
-            compress_next_track(out->compr);
-            compress_partial_drain(out->compr);
-            send_callback = true;
-            event = STREAM_CBK_EVENT_DRAIN_READY;
-            break;
-        case OFFLOAD_CMD_DRAIN:
-            compress_drain(out->compr);
-            send_callback = true;
-            event = STREAM_CBK_EVENT_DRAIN_READY;
-            break;
-        default:
-            ALOGE("%s unknown command received: %d", __func__, cmd->cmd);
-            break;
-        }
-        pthread_mutex_lock(&out->lock);
-        out->offload_thread_blocked = false;
-        pthread_cond_signal(&out->cond);
-        if (send_callback) {
-            out->offload_callback(event, NULL, out->offload_cookie);
-        }
-        free(cmd);
-    }
-
-    pthread_cond_signal(&out->cond);
-    while (!list_empty(&out->offload_cmd_list)) {
-        item = list_head(&out->offload_cmd_list);
-        list_remove(item);
-        free(node_to_item(item, struct offload_cmd, node));
-    }
-    pthread_mutex_unlock(&out->lock);
-
-    return NULL;
-}
-
-static int create_offload_callback_thread(struct stream_out *out)
-{
-    pthread_cond_init(&out->offload_cond, (const pthread_condattr_t *) NULL);
-    list_init(&out->offload_cmd_list);
-    pthread_create(&out->offload_thread, (const pthread_attr_t *) NULL,
-                    offload_thread_loop, out);
-    return 0;
-}
-
-static int destroy_offload_callback_thread(struct stream_out *out)
-{
-    pthread_mutex_lock(&out->lock);
-    stop_compressed_output_l(out);
-    send_offload_cmd_l(out, OFFLOAD_CMD_EXIT);
-
-    pthread_mutex_unlock(&out->lock);
-    pthread_join(out->offload_thread, (void **) NULL);
-    pthread_cond_destroy(&out->offload_cond);
-
-    return 0;
-}
-
-static bool allow_hdmi_channel_config(struct audio_device *adev)
-{
-    struct listnode *node;
-    struct audio_usecase *usecase;
-    bool ret = true;
-
-    list_for_each(node, &adev->usecase_list) {
-        usecase = node_to_item(node, struct audio_usecase, list);
-        if (usecase->devices & AUDIO_DEVICE_OUT_AUX_DIGITAL) {
-            /*
-             * If voice call is already existing, do not proceed further to avoid
-             * disabling/enabling both RX and TX devices, CSD calls, etc.
-             * Once the voice call done, the HDMI channels can be configured to
-             * max channels of remaining use cases.
-             */
-            if (usecase->id == USECASE_VOICE_CALL) {
-                ALOGD("%s: voice call is active, no change in HDMI channels",
-                      __func__);
-                ret = false;
-                break;
-            } else if (usecase->id == USECASE_AUDIO_PLAYBACK_MULTI_CH) {
-                ALOGD("%s: multi channel playback is active, "
-                      "no change in HDMI channels", __func__);
-                ret = false;
-                break;
-            }
-        }
-    }
-    return ret;
-}
-
-static int check_and_set_hdmi_channels(struct audio_device *adev,
-                                       unsigned int channels)
-{
-    struct listnode *node;
-    struct audio_usecase *usecase;
-
-    /* Check if change in HDMI channel config is allowed */
-    if (!allow_hdmi_channel_config(adev))
-        return 0;
-
-    if (channels == adev->cur_hdmi_channels) {
-        ALOGD("%s: Requested channels are same as current", __func__);
-        return 0;
-    }
-
-    platform_set_hdmi_channels(adev->platform, channels);
-    adev->cur_hdmi_channels = channels;
-
-    /*
-     * Deroute all the playback streams routed to HDMI so that
-     * the back end is deactivated. Note that backend will not
-     * be deactivated if any one stream is connected to it.
-     */
-    list_for_each(node, &adev->usecase_list) {
-        usecase = node_to_item(node, struct audio_usecase, list);
-        if (usecase->type == PCM_PLAYBACK &&
-                usecase->devices & AUDIO_DEVICE_OUT_AUX_DIGITAL) {
-            disable_audio_route(adev, usecase, true);
-        }
-    }
-
-    /*
-     * Enable all the streams disabled above. Now the HDMI backend
-     * will be activated with new channel configuration
-     */
-    list_for_each(node, &adev->usecase_list) {
-        usecase = node_to_item(node, struct audio_usecase, list);
-        if (usecase->type == PCM_PLAYBACK &&
-                usecase->devices & AUDIO_DEVICE_OUT_AUX_DIGITAL) {
-            enable_audio_route(adev, usecase, true);
-        }
-    }
-
-    return 0;
-}
-
-static int stop_output_stream(struct stream_out *out)
-{
-    int i, ret = 0;
-    struct audio_usecase *uc_info;
-    struct audio_device *adev = out->dev;
-
-    ALOGV("%s: enter: usecase(%d: %s)", __func__,
-          out->usecase, use_case_table[out->usecase]);
-    uc_info = get_usecase_from_list(adev, out->usecase);
-    if (uc_info == NULL) {
-        ALOGE("%s: Could not find the usecase (%d) in the list",
-              __func__, out->usecase);
-        return -EINVAL;
-    }
-
-    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD &&
-            adev->visualizer_stop_output != NULL)
-        adev->visualizer_stop_output(out->handle);
-
-    /* 1. Get and set stream specific mixer controls */
-    disable_audio_route(adev, uc_info, true);
-
-    /* 2. Disable the rx device */
-    disable_snd_device(adev, uc_info->out_snd_device, true);
-
-    list_remove(&uc_info->list);
-    free(uc_info);
-
-    /* Must be called after removing the usecase from list */
-    if (out->devices & AUDIO_DEVICE_OUT_AUX_DIGITAL)
-        check_and_set_hdmi_channels(adev, DEFAULT_HDMI_OUT_CHANNELS);
-
-    ALOGV("%s: exit: status(%d)", __func__, ret);
-    return ret;
-}
-
-int start_output_stream(struct stream_out *out)
-{
-    int ret = 0;
-    struct audio_usecase *uc_info;
-    struct audio_device *adev = out->dev;
-
-    ALOGV("%s: enter: usecase(%d: %s) devices(%#x)",
-          __func__, out->usecase, use_case_table[out->usecase], out->devices);
-    out->pcm_device_id = platform_get_pcm_device_id(out->usecase, PCM_PLAYBACK);
-    if (out->pcm_device_id < 0) {
-        ALOGE("%s: Invalid PCM device id(%d) for the usecase(%d)",
-              __func__, out->pcm_device_id, out->usecase);
-        ret = -EINVAL;
-        goto error_config;
-    }
-
-    uc_info = (struct audio_usecase *)calloc(1, sizeof(struct audio_usecase));
-    uc_info->id = out->usecase;
-    uc_info->type = PCM_PLAYBACK;
-    uc_info->stream.out = out;
-    uc_info->devices = out->devices;
-    uc_info->in_snd_device = SND_DEVICE_NONE;
-    uc_info->out_snd_device = SND_DEVICE_NONE;
-
-    /* This must be called before adding this usecase to the list */
-    if (out->devices & AUDIO_DEVICE_OUT_AUX_DIGITAL)
-        check_and_set_hdmi_channels(adev, out->config.channels);
-
-    list_add_tail(&adev->usecase_list, &uc_info->list);
-
-    select_devices(adev, out->usecase);
-
-    ALOGV("%s: Opening PCM device card_id(%d) device_id(%d)",
-          __func__, 0, out->pcm_device_id);
-    if (out->usecase != USECASE_AUDIO_PLAYBACK_OFFLOAD) {
-        out->pcm = pcm_open(SOUND_CARD, out->pcm_device_id,
-                               PCM_OUT | PCM_MONOTONIC, &out->config);
-        if (out->pcm && !pcm_is_ready(out->pcm)) {
-            ALOGE("%s: %s", __func__, pcm_get_error(out->pcm));
-            pcm_close(out->pcm);
-            out->pcm = NULL;
-            ret = -EIO;
-            goto error_open;
-        }
-    } else {
-        out->pcm = NULL;
-        out->compr = compress_open(SOUND_CARD, out->pcm_device_id,
-                                   COMPRESS_IN, &out->compr_config);
-        if (out->compr && !is_compress_ready(out->compr)) {
-            ALOGE("%s: %s", __func__, compress_get_error(out->compr));
-            compress_close(out->compr);
-            out->compr = NULL;
-            ret = -EIO;
-            goto error_open;
-        }
-        if (out->offload_callback)
-            compress_nonblock(out->compr, out->non_blocking);
-
-        if (adev->visualizer_start_output != NULL)
-            adev->visualizer_start_output(out->handle);
-    }
-    ALOGV("%s: exit", __func__);
-    return 0;
-error_open:
-    stop_output_stream(out);
-error_config:
-    return ret;
-}
-
 static int check_input_parameters(uint32_t sample_rate,
                                   audio_format_t format,
                                   int channel_count)
@@ -1128,493 +670,6 @@
     return size;
 }
 
-static uint32_t out_get_sample_rate(const struct audio_stream *stream)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-
-    return out->sample_rate;
-}
-
-static int out_set_sample_rate(struct audio_stream *stream, uint32_t rate)
-{
-    return -ENOSYS;
-}
-
-static size_t out_get_buffer_size(const struct audio_stream *stream)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-
-    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD)
-        return out->compr_config.fragment_size;
-
-    return out->config.period_size * audio_stream_frame_size(stream);
-}
-
-static uint32_t out_get_channels(const struct audio_stream *stream)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-
-    return out->channel_mask;
-}
-
-static audio_format_t out_get_format(const struct audio_stream *stream)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-
-    return out->format;
-}
-
-static int out_set_format(struct audio_stream *stream, audio_format_t format)
-{
-    return -ENOSYS;
-}
-
-static int out_standby(struct audio_stream *stream)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-    struct audio_device *adev = out->dev;
-
-    ALOGV("%s: enter: usecase(%d: %s)", __func__,
-          out->usecase, use_case_table[out->usecase]);
-    if (out->usecase == USECASE_COMPRESS_VOIP_CALL) {
-        /* Ignore standby in case of voip call because the voip output
-         * stream is closed in adev_close_output_stream()
-         */
-        ALOGV("%s: Ignore Standby in VOIP call", __func__);
-        return 0;
-    }
-
-    pthread_mutex_lock(&out->lock);
-    pthread_mutex_lock(&adev->lock);
-    if (!out->standby) {
-        out->standby = true;
-        if (out->usecase != USECASE_AUDIO_PLAYBACK_OFFLOAD) {
-            if (out->pcm) {
-                pcm_close(out->pcm);
-                out->pcm = NULL;
-            }
-        } else {
-            stop_compressed_output_l(out);
-            out->gapless_mdata.encoder_delay = 0;
-            out->gapless_mdata.encoder_padding = 0;
-            if (out->compr != NULL) {
-                compress_close(out->compr);
-                out->compr = NULL;
-            }
-        }
-        stop_output_stream(out);
-    }
-    pthread_mutex_unlock(&adev->lock);
-    pthread_mutex_unlock(&out->lock);
-    ALOGV("%s: exit", __func__);
-    return 0;
-}
-
-static int out_dump(const struct audio_stream *stream, int fd)
-{
-    return 0;
-}
-
-static int parse_compress_metadata(struct stream_out *out, struct str_parms *parms)
-{
-    int ret = 0;
-    char value[32];
-    struct compr_gapless_mdata tmp_mdata;
-
-    if (!out || !parms) {
-        return -EINVAL;
-    }
-
-    ret = str_parms_get_str(parms, AUDIO_OFFLOAD_CODEC_DELAY_SAMPLES, value, sizeof(value));
-    if (ret >= 0) {
-        tmp_mdata.encoder_delay = atoi(value); //whats a good limit check?
-    } else {
-        return -EINVAL;
-    }
-
-    ret = str_parms_get_str(parms, AUDIO_OFFLOAD_CODEC_PADDING_SAMPLES, value, sizeof(value));
-    if (ret >= 0) {
-        tmp_mdata.encoder_padding = atoi(value);
-    } else {
-        return -EINVAL;
-    }
-
-    out->gapless_mdata = tmp_mdata;
-    out->send_new_metadata = 1;
-    ALOGV("%s new encoder delay %u and padding %u", __func__,
-          out->gapless_mdata.encoder_delay, out->gapless_mdata.encoder_padding);
-
-    return 0;
-}
-
-
-static int out_set_parameters(struct audio_stream *stream, const char *kvpairs)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-    struct audio_device *adev = out->dev;
-    struct audio_usecase *usecase;
-    struct listnode *node;
-    struct str_parms *parms;
-    char value[32];
-    int ret, val = 0;
-    bool select_new_device = false;
-
-    ALOGD("%s: enter: usecase(%d: %s) kvpairs: %s",
-          __func__, out->usecase, use_case_table[out->usecase], kvpairs);
-    parms = str_parms_create_str(kvpairs);
-    ret = str_parms_get_str(parms, AUDIO_PARAMETER_STREAM_ROUTING, value, sizeof(value));
-    if (ret >= 0) {
-        val = atoi(value);
-        pthread_mutex_lock(&out->lock);
-        pthread_mutex_lock(&adev->lock);
-
-        /*
-         * When HDMI cable is unplugged the music playback is paused and
-         * the policy manager sends routing=0. But the audioflinger
-         * continues to write data until standby time (3sec).
-         * As the HDMI core is turned off, the write gets blocked.
-         * Avoid this by routing audio to speaker until standby.
-         */
-        if (out->devices == AUDIO_DEVICE_OUT_AUX_DIGITAL &&
-                val == AUDIO_DEVICE_NONE) {
-            val = AUDIO_DEVICE_OUT_SPEAKER;
-        }
-
-        /*
-         * select_devices() call below switches all the usecases on the same
-         * backend to the new device. Refer to check_usecases_codec_backend() in
-         * the select_devices(). But how do we undo this?
-         *
-         * For example, music playback is active on headset (deep-buffer usecase)
-         * and if we go to ringtones and select a ringtone, low-latency usecase
-         * will be started on headset+speaker. As we can't enable headset+speaker
-         * and headset devices at the same time, select_devices() switches the music
-         * playback to headset+speaker while starting low-lateny usecase for ringtone.
-         * So when the ringtone playback is completed, how do we undo the same?
-         *
-         * We are relying on the out_set_parameters() call on deep-buffer output,
-         * once the ringtone playback is ended.
-         * NOTE: We should not check if the current devices are same as new devices.
-         *       Because select_devices() must be called to switch back the music
-         *       playback to headset.
-         */
-        if (val != 0) {
-            out->devices = val;
-
-            if (!out->standby)
-                select_devices(adev, out->usecase);
-        }
-
-        pthread_mutex_unlock(&adev->lock);
-        pthread_mutex_unlock(&out->lock);
-    }
-
-    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
-        parse_compress_metadata(out, parms);
-    }
-
-    str_parms_destroy(parms);
-    ALOGV("%s: exit: code(%d)", __func__, ret);
-    return ret;
-}
-
-static char* out_get_parameters(const struct audio_stream *stream, const char *keys)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-    struct str_parms *query = str_parms_create_str(keys);
-    char *str;
-    char value[256];
-    struct str_parms *reply = str_parms_create();
-    size_t i, j;
-    int ret;
-    bool first = true;
-    ALOGV("%s: enter: keys - %s", __func__, keys);
-    ret = str_parms_get_str(query, AUDIO_PARAMETER_STREAM_SUP_CHANNELS, value, sizeof(value));
-    if (ret >= 0) {
-        value[0] = '\0';
-        i = 0;
-        while (out->supported_channel_masks[i] != 0) {
-            for (j = 0; j < ARRAY_SIZE(out_channels_name_to_enum_table); j++) {
-                if (out_channels_name_to_enum_table[j].value == out->supported_channel_masks[i]) {
-                    if (!first) {
-                        strlcat(value, "|", sizeof(value));
-                    }
-                    strlcat(value, out_channels_name_to_enum_table[j].name, sizeof(value));
-                    first = false;
-                    break;
-                }
-            }
-            i++;
-        }
-        str_parms_add_str(reply, AUDIO_PARAMETER_STREAM_SUP_CHANNELS, value);
-        str = str_parms_to_str(reply);
-    }
-    str_parms_destroy(query);
-    str_parms_destroy(reply);
-    ALOGV("%s: exit: returns - %s", __func__, str);
-    return str;
-}
-
-static uint32_t out_get_latency(const struct audio_stream_out *stream)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-
-    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD)
-        return COMPRESS_OFFLOAD_PLAYBACK_LATENCY;
-
-    return (out->config.period_count * out->config.period_size * 1000) /
-           (out->config.rate);
-}
-
-static int out_set_volume(struct audio_stream_out *stream, float left,
-                          float right)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-    int volume[2];
-
-    if (out->usecase == USECASE_AUDIO_PLAYBACK_MULTI_CH) {
-        /* only take left channel into account: the API is for stereo anyway */
-        out->muted = (left == 0.0f);
-        return 0;
-    } else if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
-        const char *mixer_ctl_name = "Compress Playback Volume";
-        struct audio_device *adev = out->dev;
-        struct mixer_ctl *ctl;
-
-        ctl = mixer_get_ctl_by_name(adev->mixer, mixer_ctl_name);
-        if (!ctl) {
-            ALOGE("%s: Could not get ctl for mixer cmd - %s",
-                  __func__, mixer_ctl_name);
-            return -EINVAL;
-        }
-        volume[0] = (int)(left * COMPRESS_PLAYBACK_VOLUME_MAX);
-        volume[1] = (int)(right * COMPRESS_PLAYBACK_VOLUME_MAX);
-        mixer_ctl_set_array(ctl, volume, sizeof(volume)/sizeof(volume[0]));
-        return 0;
-    }
-
-    return -ENOSYS;
-}
-
-static ssize_t out_write(struct audio_stream_out *stream, const void *buffer,
-                         size_t bytes)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-    struct audio_device *adev = out->dev;
-    ssize_t ret = 0;
-
-    pthread_mutex_lock(&out->lock);
-    if (out->standby) {
-        out->standby = false;
-        pthread_mutex_lock(&adev->lock);
-            ret = start_output_stream(out);
-        pthread_mutex_unlock(&adev->lock);
-        /* ToDo: If use case is compress offload should return 0 */
-        if (ret != 0) {
-            out->standby = true;
-            goto exit;
-        }
-    }
-
-    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
-        ALOGVV("%s: writing buffer (%d bytes) to compress device", __func__, bytes);
-        if (out->send_new_metadata) {
-            ALOGVV("send new gapless metadata");
-            compress_set_gapless_metadata(out->compr, &out->gapless_mdata);
-            out->send_new_metadata = 0;
-        }
-
-        ret = compress_write(out->compr, buffer, bytes);
-        ALOGVV("%s: writing buffer (%d bytes) to compress device returned %d", __func__, bytes, ret);
-        if (ret >= 0 && ret < (ssize_t)bytes) {
-            send_offload_cmd_l(out, OFFLOAD_CMD_WAIT_FOR_BUFFER);
-        }
-        if (!out->playback_started) {
-            compress_start(out->compr);
-            out->playback_started = 1;
-            out->offload_state = OFFLOAD_STATE_PLAYING;
-        }
-        pthread_mutex_unlock(&out->lock);
-        return ret;
-    } else {
-        if (out->pcm) {
-            if (out->muted)
-                memset((void *)buffer, 0, bytes);
-            ALOGVV("%s: writing buffer (%d bytes) to pcm device", __func__, bytes);
-            ret = pcm_write(out->pcm, (void *)buffer, bytes);
-            if (ret == 0)
-                out->written += bytes / (out->config.channels * sizeof(short));
-        }
-    }
-
-exit:
-    pthread_mutex_unlock(&out->lock);
-
-    if (ret != 0) {
-        if (out->pcm)
-            ALOGE("%s: error %d - %s", __func__, ret, pcm_get_error(out->pcm));
-        out_standby(&out->stream.common);
-        usleep(bytes * 1000000 / audio_stream_frame_size(&out->stream.common) /
-               out_get_sample_rate(&out->stream.common));
-    }
-    return bytes;
-}
-
-static int out_get_render_position(const struct audio_stream_out *stream,
-                                   uint32_t *dsp_frames)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-    *dsp_frames = 0;
-    if ((out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) && (dsp_frames != NULL)) {
-        pthread_mutex_lock(&out->lock);
-        if (out->compr != NULL) {
-            compress_get_tstamp(out->compr, (unsigned long *)dsp_frames,
-                    &out->sample_rate);
-            ALOGVV("%s rendered frames %d sample_rate %d",
-                   __func__, *dsp_frames, out->sample_rate);
-        }
-        pthread_mutex_unlock(&out->lock);
-        return 0;
-    } else
-        return -EINVAL;
-}
-
-static int out_add_audio_effect(const struct audio_stream *stream, effect_handle_t effect)
-{
-    return 0;
-}
-
-static int out_remove_audio_effect(const struct audio_stream *stream, effect_handle_t effect)
-{
-    return 0;
-}
-
-static int out_get_next_write_timestamp(const struct audio_stream_out *stream,
-                                        int64_t *timestamp)
-{
-    return -EINVAL;
-}
-
-static int out_get_presentation_position(const struct audio_stream_out *stream,
-                                   uint64_t *frames, struct timespec *timestamp)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-    int ret = -1;
-    unsigned long dsp_frames;
-
-    pthread_mutex_lock(&out->lock);
-
-    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
-        if (out->compr != NULL) {
-            compress_get_tstamp(out->compr, &dsp_frames,
-                    &out->sample_rate);
-            ALOGVV("%s rendered frames %ld sample_rate %d",
-                   __func__, dsp_frames, out->sample_rate);
-            *frames = dsp_frames;
-            ret = 0;
-            /* this is the best we can do */
-            clock_gettime(CLOCK_MONOTONIC, timestamp);
-        }
-    } else {
-        if (out->pcm) {
-            size_t avail;
-            if (pcm_get_htimestamp(out->pcm, &avail, timestamp) == 0) {
-                size_t kernel_buffer_size = out->config.period_size * out->config.period_count;
-                int64_t signed_frames = out->written - kernel_buffer_size + avail;
-                // This adjustment accounts for buffering after app processor.
-                // It is based on estimated DSP latency per use case, rather than exact.
-                signed_frames -=
-                    (platform_render_latency(out->usecase) * out->sample_rate / 1000000LL);
-
-                // It would be unusual for this value to be negative, but check just in case ...
-                if (signed_frames >= 0) {
-                    *frames = signed_frames;
-                    ret = 0;
-                }
-            }
-        }
-    }
-
-    pthread_mutex_unlock(&out->lock);
-
-    return ret;
-}
-
-static int out_set_callback(struct audio_stream_out *stream,
-            stream_callback_t callback, void *cookie)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-
-    ALOGV("%s", __func__);
-    pthread_mutex_lock(&out->lock);
-    out->offload_callback = callback;
-    out->offload_cookie = cookie;
-    pthread_mutex_unlock(&out->lock);
-    return 0;
-}
-
-static int out_pause(struct audio_stream_out* stream)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-    int status = -ENOSYS;
-    ALOGV("%s", __func__);
-    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
-        pthread_mutex_lock(&out->lock);
-        if (out->compr != NULL && out->offload_state == OFFLOAD_STATE_PLAYING) {
-            status = compress_pause(out->compr);
-            out->offload_state = OFFLOAD_STATE_PAUSED;
-        }
-        pthread_mutex_unlock(&out->lock);
-    }
-    return status;
-}
-
-static int out_resume(struct audio_stream_out* stream)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-    int status = -ENOSYS;
-    ALOGV("%s", __func__);
-    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
-        status = 0;
-        pthread_mutex_lock(&out->lock);
-        if (out->compr != NULL && out->offload_state == OFFLOAD_STATE_PAUSED) {
-            status = compress_resume(out->compr);
-            out->offload_state = OFFLOAD_STATE_PLAYING;
-        }
-        pthread_mutex_unlock(&out->lock);
-    }
-    return status;
-}
-
-static int out_drain(struct audio_stream_out* stream, audio_drain_type_t type )
-{
-    struct stream_out *out = (struct stream_out *)stream;
-    int status = -ENOSYS;
-    ALOGV("%s", __func__);
-    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
-        pthread_mutex_lock(&out->lock);
-        if (type == AUDIO_DRAIN_EARLY_NOTIFY)
-            status = send_offload_cmd_l(out, OFFLOAD_CMD_PARTIAL_DRAIN);
-        else
-            status = send_offload_cmd_l(out, OFFLOAD_CMD_DRAIN);
-        pthread_mutex_unlock(&out->lock);
-    }
-    return status;
-}
-
-static int out_flush(struct audio_stream_out* stream)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-    ALOGV("%s", __func__);
-    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
-        pthread_mutex_lock(&out->lock);
-        stop_compressed_output_l(out);
-        pthread_mutex_unlock(&out->lock);
-        return 0;
-    }
-    return -ENOSYS;
-}
-
 /** audio_stream_in implementation **/
 static uint32_t in_get_sample_rate(const struct audio_stream *stream)
 {
@@ -1801,29 +856,6 @@
 {
     struct stream_in *in = (struct stream_in *)stream;
     int status = 0;
-    effect_descriptor_t desc;
-
-    status = (*effect)->get_descriptor(effect, &desc);
-    if (status != 0)
-        return status;
-
-    pthread_mutex_lock(&in->lock);
-    pthread_mutex_lock(&in->dev->lock);
-    if ((in->source == AUDIO_SOURCE_VOICE_COMMUNICATION) &&
-            in->enable_aec != enable &&
-            (memcmp(&desc.type, FX_IID_AEC, sizeof(effect_uuid_t)) == 0)) {
-        in->enable_aec = enable;
-        if (!in->standby)
-            select_devices(in->dev, in->usecase);
-    }
-    if (in->enable_ns != enable &&
-            (memcmp(&desc.type, FX_IID_NS, sizeof(effect_uuid_t)) == 0)) {
-        in->enable_ns = enable;
-        if (!in->standby)
-            select_devices(in->dev, in->usecase);
-    }
-    pthread_mutex_unlock(&in->dev->lock);
-    pthread_mutex_unlock(&in->lock);
 
     return 0;
 }
@@ -1842,198 +874,6 @@
     return add_remove_audio_effect(stream, effect, false);
 }
 
-static int adev_open_output_stream(struct audio_hw_device *dev,
-                                   audio_io_handle_t handle,
-                                   audio_devices_t devices,
-                                   audio_output_flags_t flags,
-                                   struct audio_config *config,
-                                   struct audio_stream_out **stream_out)
-{
-    struct audio_device *adev = (struct audio_device *)dev;
-    struct stream_out *out;
-    int i, ret;
-
-    ALOGV("%s: enter: sample_rate(%d) channel_mask(%#x) devices(%#x) flags(%#x)",
-          __func__, config->sample_rate, config->channel_mask, devices, flags);
-    *stream_out = NULL;
-    out = (struct stream_out *)calloc(1, sizeof(struct stream_out));
-
-    if (devices == AUDIO_DEVICE_NONE)
-        devices = AUDIO_DEVICE_OUT_SPEAKER;
-
-    out->flags = flags;
-    out->devices = devices;
-    out->dev = adev;
-    out->format = config->format;
-    out->sample_rate = config->sample_rate;
-    out->channel_mask = AUDIO_CHANNEL_OUT_STEREO;
-    out->supported_channel_masks[0] = AUDIO_CHANNEL_OUT_STEREO;
-    out->handle = handle;
-
-    /* Init use case and pcm_config */
-    if (out->flags == AUDIO_OUTPUT_FLAG_DIRECT &&
-        out->devices & AUDIO_DEVICE_OUT_AUX_DIGITAL) {
-        pthread_mutex_lock(&adev->lock);
-        ret = read_hdmi_channel_masks(out);
-        pthread_mutex_unlock(&adev->lock);
-        if (ret != 0)
-            goto error_open;
-
-        if (config->sample_rate == 0)
-            config->sample_rate = DEFAULT_OUTPUT_SAMPLING_RATE;
-        if (config->channel_mask == 0)
-            config->channel_mask = AUDIO_CHANNEL_OUT_5POINT1;
-
-        out->channel_mask = config->channel_mask;
-        out->sample_rate = config->sample_rate;
-        out->usecase = USECASE_AUDIO_PLAYBACK_MULTI_CH;
-        out->config = pcm_config_hdmi_multi;
-        out->config.rate = config->sample_rate;
-        out->config.channels = popcount(out->channel_mask);
-        out->config.period_size = HDMI_MULTI_PERIOD_BYTES / (out->config.channels * 2);
-    } else if (out->flags & AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD) {
-        if (config->offload_info.version != AUDIO_INFO_INITIALIZER.version ||
-            config->offload_info.size != AUDIO_INFO_INITIALIZER.size) {
-            ALOGE("%s: Unsupported Offload information", __func__);
-            ret = -EINVAL;
-            goto error_open;
-        }
-        if (!is_supported_format(config->offload_info.format)) {
-            ALOGE("%s: Unsupported audio format", __func__);
-            ret = -EINVAL;
-            goto error_open;
-        }
-
-        out->compr_config.codec = (struct snd_codec *)
-                                    calloc(1, sizeof(struct snd_codec));
-
-        out->usecase = USECASE_AUDIO_PLAYBACK_OFFLOAD;
-        if (config->offload_info.channel_mask)
-            out->channel_mask = config->offload_info.channel_mask;
-        else if (config->channel_mask)
-            out->channel_mask = config->channel_mask;
-        out->format = config->offload_info.format;
-        out->sample_rate = config->offload_info.sample_rate;
-
-        out->stream.set_callback = out_set_callback;
-        out->stream.pause = out_pause;
-        out->stream.resume = out_resume;
-        out->stream.drain = out_drain;
-        out->stream.flush = out_flush;
-
-        out->compr_config.codec->id =
-                get_snd_codec_id(config->offload_info.format);
-        out->compr_config.fragment_size = COMPRESS_OFFLOAD_FRAGMENT_SIZE;
-        out->compr_config.fragments = COMPRESS_OFFLOAD_NUM_FRAGMENTS;
-        out->compr_config.codec->sample_rate =
-                    compress_get_alsa_rate(config->offload_info.sample_rate);
-        out->compr_config.codec->bit_rate =
-                    config->offload_info.bit_rate;
-        out->compr_config.codec->ch_in =
-                    popcount(config->channel_mask);
-        out->compr_config.codec->ch_out = out->compr_config.codec->ch_in;
-
-        if (flags & AUDIO_OUTPUT_FLAG_NON_BLOCKING)
-            out->non_blocking = 1;
-
-        out->send_new_metadata = 1;
-        create_offload_callback_thread(out);
-        ALOGV("%s: offloaded output offload_info version %04x bit rate %d",
-                __func__, config->offload_info.version,
-                config->offload_info.bit_rate);
-    } else if (out->flags & AUDIO_OUTPUT_FLAG_FAST) {
-        out->usecase = USECASE_AUDIO_PLAYBACK_LOW_LATENCY;
-        out->config = pcm_config_low_latency;
-        out->sample_rate = out->config.rate;
-    } else {
-        out->usecase = USECASE_AUDIO_PLAYBACK_DEEP_BUFFER;
-        out->config = pcm_config_deep_buffer;
-        out->sample_rate = out->config.rate;
-    }
-
-    if (flags & AUDIO_OUTPUT_FLAG_PRIMARY) {
-        if(adev->primary_output == NULL)
-            adev->primary_output = out;
-        else {
-            ALOGE("%s: Primary output is already opened", __func__);
-            ret = -EEXIST;
-            goto error_open;
-        }
-    }
-
-    /* Check if this usecase is already existing */
-    pthread_mutex_lock(&adev->lock);
-    if (get_usecase_from_list(adev, out->usecase) != NULL) {
-        ALOGE("%s: Usecase (%d) is already present", __func__, out->usecase);
-        pthread_mutex_unlock(&adev->lock);
-        ret = -EEXIST;
-        goto error_open;
-    }
-    pthread_mutex_unlock(&adev->lock);
-
-    out->stream.common.get_sample_rate = out_get_sample_rate;
-    out->stream.common.set_sample_rate = out_set_sample_rate;
-    out->stream.common.get_buffer_size = out_get_buffer_size;
-    out->stream.common.get_channels = out_get_channels;
-    out->stream.common.get_format = out_get_format;
-    out->stream.common.set_format = out_set_format;
-    out->stream.common.standby = out_standby;
-    out->stream.common.dump = out_dump;
-    out->stream.common.set_parameters = out_set_parameters;
-    out->stream.common.get_parameters = out_get_parameters;
-    out->stream.common.add_audio_effect = out_add_audio_effect;
-    out->stream.common.remove_audio_effect = out_remove_audio_effect;
-    out->stream.get_latency = out_get_latency;
-    out->stream.set_volume = out_set_volume;
-    out->stream.write = out_write;
-    out->stream.get_render_position = out_get_render_position;
-    out->stream.get_next_write_timestamp = out_get_next_write_timestamp;
-    out->stream.get_presentation_position = out_get_presentation_position;
-
-    out->standby = 1;
-    /* out->muted = false; by calloc() */
-    /* out->written = 0; by calloc() */
-
-    pthread_mutex_init(&out->lock, (const pthread_mutexattr_t *) NULL);
-    pthread_cond_init(&out->cond, (const pthread_condattr_t *) NULL);
-
-    config->format = out->stream.common.get_format(&out->stream.common);
-    config->channel_mask = out->stream.common.get_channels(&out->stream.common);
-    config->sample_rate = out->stream.common.get_sample_rate(&out->stream.common);
-
-    *stream_out = &out->stream;
-    ALOGV("%s: exit", __func__);
-    return 0;
-
-error_open:
-    free(out);
-    *stream_out = NULL;
-    ALOGD("%s: exit: ret %d", __func__, ret);
-    return ret;
-}
-
-static void adev_close_output_stream(struct audio_hw_device *dev,
-                                     struct audio_stream_out *stream)
-{
-    struct stream_out *out = (struct stream_out *)stream;
-    struct audio_device *adev = out->dev;
-    int ret = 0;
-
-    ALOGV("%s: enter", __func__);
-    out_standby(&stream->common);
-
-    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
-        destroy_offload_callback_thread(out);
-
-        if (out->compr_config.codec != NULL)
-            free(out->compr_config.codec);
-    }
-    pthread_cond_destroy(&out->cond);
-    pthread_mutex_destroy(&out->lock);
-    free(stream);
-    ALOGV("%s: exit", __func__);
-}
-
 static int adev_set_parameters(struct audio_hw_device *dev, const char *kvpairs)
 {
     struct audio_device *adev = (struct audio_device *)dev;
diff --git a/hal_mpq/audio_hw.h b/hal_mpq/audio_hw.h
index 262fda8..e1319a5 100644
--- a/hal_mpq/audio_hw.h
+++ b/hal_mpq/audio_hw.h
@@ -220,6 +220,41 @@
     int (*visualizer_stop_output)(audio_io_handle_t);
 };
 
+static const char * const use_case_table[AUDIO_USECASE_MAX] = {
+    [USECASE_AUDIO_PLAYBACK_DEEP_BUFFER] = "deep-buffer-playback",
+    [USECASE_AUDIO_PLAYBACK_LOW_LATENCY] = "low-latency-playback",
+    [USECASE_AUDIO_PLAYBACK_MULTI_CH] = "multi-channel-playback",
+    [USECASE_AUDIO_PLAYBACK_OFFLOAD] = "compress-offload-playback",
+    [USECASE_AUDIO_RECORD] = "audio-record",
+    [USECASE_AUDIO_RECORD_COMPRESS] = "audio-record-compress",
+    [USECASE_AUDIO_RECORD_LOW_LATENCY] = "low-latency-record",
+    [USECASE_AUDIO_RECORD_FM_VIRTUAL] = "fm-virtual-record",
+    [USECASE_AUDIO_PLAYBACK_FM] = "play-fm",
+    [USECASE_VOICE_CALL] = "voice-call",
+
+    [USECASE_VOICE2_CALL] = "voice2-call",
+    [USECASE_VOLTE_CALL] = "volte-call",
+    [USECASE_QCHAT_CALL] = "qchat-call",
+    [USECASE_COMPRESS_VOIP_CALL] = "compress-voip-call",
+    [USECASE_INCALL_REC_UPLINK] = "incall-rec-uplink",
+    [USECASE_INCALL_REC_DOWNLINK] = "incall-rec-downlink",
+    [USECASE_INCALL_REC_UPLINK_AND_DOWNLINK] = "incall-rec-uplink-and-downlink",
+    [USECASE_INCALL_MUSIC_UPLINK] = "incall_music_uplink",
+    [USECASE_INCALL_MUSIC_UPLINK2] = "incall_music_uplink2",
+    [USECASE_AUDIO_SPKR_CALIB_RX] = "spkr-rx-calib",
+    [USECASE_AUDIO_SPKR_CALIB_TX] = "spkr-vi-record",
+};
+
+int adev_open_output_stream(struct audio_hw_device *dev,
+                                   audio_io_handle_t handle,
+                                   audio_devices_t devices,
+                                   audio_output_flags_t flags,
+                                   struct audio_config *config,
+                                   struct audio_stream_out **stream_out);
+
+void adev_close_output_stream(struct audio_hw_device *dev,
+                                     struct audio_stream_out *stream);
+
 int select_devices(struct audio_device *adev,
                           audio_usecase_t uc_id);
 int disable_audio_route(struct audio_device *adev,
diff --git a/hal_mpq/audio_stream_out.c b/hal_mpq/audio_stream_out.c
new file mode 100644
index 0000000..71eb2f1
--- /dev/null
+++ b/hal_mpq/audio_stream_out.c
@@ -0,0 +1,1157 @@
+/* audio_stream_out.c
+ **
+ ** Copyright 2008-2009 Wind River Systems
+ ** Copyright (c) 2011-2013, The Linux Foundation. All rights reserved
+ ** Not a Contribution, Apache license notifications and license are retained
+ ** for attribution purposes only.
+ **
+ ** 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 "audio_stream_out"
+/*#define LOG_NDEBUG 0*/
+/*#define VERY_VERY_VERBOSE_LOGGING*/
+#ifdef VERY_VERY_VERBOSE_LOGGING
+#define ALOGVV ALOGV
+#else
+#define ALOGVV(a...) do { } while(0)
+#endif
+
+#include <errno.h>
+#include <pthread.h>
+#include <stdint.h>
+#include <sys/time.h>
+#include <stdlib.h>
+#include <math.h>
+#include <dlfcn.h>
+#include <sys/resource.h>
+#include <sys/prctl.h>
+
+#include <cutils/log.h>
+#include <cutils/str_parms.h>
+#include <cutils/properties.h>
+#include <cutils/atomic.h>
+#include <cutils/sched_policy.h>
+
+#include <system/thread_defs.h>
+#include "audio_hw.h"
+#include "platform_api.h"
+#include <platform.h>
+
+#include "sound/compress_params.h"
+
+#define COMPRESS_OFFLOAD_FRAGMENT_SIZE (32 * 1024)
+#define COMPRESS_OFFLOAD_NUM_FRAGMENTS 4
+/* ToDo: Check and update a proper value in msec */
+#define COMPRESS_OFFLOAD_PLAYBACK_LATENCY 96
+#define COMPRESS_PLAYBACK_VOLUME_MAX 0x2000
+
+struct pcm_config pcm_config_deep_buffer = {
+    .channels = 2,
+    .rate = DEFAULT_OUTPUT_SAMPLING_RATE,
+    .period_size = DEEP_BUFFER_OUTPUT_PERIOD_SIZE,
+    .period_count = DEEP_BUFFER_OUTPUT_PERIOD_COUNT,
+    .format = PCM_FORMAT_S16_LE,
+    .start_threshold = DEEP_BUFFER_OUTPUT_PERIOD_SIZE / 4,
+    .stop_threshold = INT_MAX,
+    .avail_min = DEEP_BUFFER_OUTPUT_PERIOD_SIZE / 4,
+};
+
+struct pcm_config pcm_config_low_latency = {
+    .channels = 2,
+    .rate = DEFAULT_OUTPUT_SAMPLING_RATE,
+    .period_size = LOW_LATENCY_OUTPUT_PERIOD_SIZE,
+    .period_count = LOW_LATENCY_OUTPUT_PERIOD_COUNT,
+    .format = PCM_FORMAT_S16_LE,
+    .start_threshold = LOW_LATENCY_OUTPUT_PERIOD_SIZE / 4,
+    .stop_threshold = INT_MAX,
+    .avail_min = LOW_LATENCY_OUTPUT_PERIOD_SIZE / 4,
+};
+
+struct pcm_config pcm_config_hdmi_multi = {
+    .channels = HDMI_MULTI_DEFAULT_CHANNEL_COUNT, /* changed when the stream is opened */
+    .rate = DEFAULT_OUTPUT_SAMPLING_RATE, /* changed when the stream is opened */
+    .period_size = HDMI_MULTI_PERIOD_SIZE,
+    .period_count = HDMI_MULTI_PERIOD_COUNT,
+    .format = PCM_FORMAT_S16_LE,
+    .start_threshold = 0,
+    .stop_threshold = INT_MAX,
+    .avail_min = 0,
+};
+
+#define STRING_TO_ENUM(string) { #string, string }
+
+struct string_to_enum {
+    const char *name;
+    uint32_t value;
+};
+
+static const struct string_to_enum out_channels_name_to_enum_table[] = {
+    STRING_TO_ENUM(AUDIO_CHANNEL_OUT_STEREO),
+    STRING_TO_ENUM(AUDIO_CHANNEL_OUT_5POINT1),
+    STRING_TO_ENUM(AUDIO_CHANNEL_OUT_7POINT1),
+};
+
+static bool is_supported_format(audio_format_t format)
+{
+    if (format == AUDIO_FORMAT_MP3 ||
+            format == AUDIO_FORMAT_AAC)
+        return true;
+
+    return false;
+}
+
+static int get_snd_codec_id(audio_format_t format)
+{
+    int id = 0;
+
+    switch (format) {
+    case AUDIO_FORMAT_MP3:
+        id = SND_AUDIOCODEC_MP3;
+        break;
+    case AUDIO_FORMAT_AAC:
+        id = SND_AUDIOCODEC_AAC;
+        break;
+    default:
+        ALOGE("%s: Unsupported audio format", __func__);
+    }
+
+    return id;
+}
+
+/* must be called with hw device mutex locked */
+static int read_hdmi_channel_masks(struct stream_out *out)
+{
+    int ret = 0;
+    int channels = platform_edid_get_max_channels(out->dev->platform);
+
+    switch (channels) {
+        /*
+         * Do not handle stereo output in Multi-channel cases
+         * Stereo case is handled in normal playback path
+         */
+    case 6:
+        ALOGV("%s: HDMI supports 5.1", __func__);
+        out->supported_channel_masks[0] = AUDIO_CHANNEL_OUT_5POINT1;
+        break;
+    case 8:
+        ALOGV("%s: HDMI supports 5.1 and 7.1 channels", __func__);
+        out->supported_channel_masks[0] = AUDIO_CHANNEL_OUT_5POINT1;
+        out->supported_channel_masks[1] = AUDIO_CHANNEL_OUT_7POINT1;
+        break;
+    default:
+        ALOGE("HDMI does not support multi channel playback");
+        ret = -ENOSYS;
+        break;
+    }
+    return ret;
+}
+
+/* must be called with out->lock locked */
+static int send_offload_cmd_l(struct stream_out* out, int command)
+{
+    struct offload_cmd *cmd = (struct offload_cmd *)calloc(1, sizeof(struct offload_cmd));
+
+    ALOGVV("%s %d", __func__, command);
+
+    cmd->cmd = command;
+    list_add_tail(&out->offload_cmd_list, &cmd->node);
+    pthread_cond_signal(&out->offload_cond);
+    return 0;
+}
+
+/* must be called iwth out->lock locked */
+static void stop_compressed_output_l(struct stream_out *out)
+{
+    out->offload_state = OFFLOAD_STATE_IDLE;
+    out->playback_started = 0;
+    out->send_new_metadata = 1;
+    if (out->compr != NULL) {
+        compress_stop(out->compr);
+        while (out->offload_thread_blocked) {
+            pthread_cond_wait(&out->cond, &out->lock);
+        }
+    }
+}
+
+static void *offload_thread_loop(void *context)
+{
+    struct stream_out *out = (struct stream_out *) context;
+    struct listnode *item;
+
+    out->offload_state = OFFLOAD_STATE_IDLE;
+    out->playback_started = 0;
+
+    setpriority(PRIO_PROCESS, 0, ANDROID_PRIORITY_AUDIO);
+    set_sched_policy(0, SP_FOREGROUND);
+    prctl(PR_SET_NAME, (unsigned long)"Offload Callback", 0, 0, 0);
+
+    ALOGV("%s", __func__);
+    pthread_mutex_lock(&out->lock);
+    for (;;) {
+        struct offload_cmd *cmd = NULL;
+        stream_callback_event_t event;
+        bool send_callback = false;
+
+        ALOGVV("%s offload_cmd_list %d out->offload_state %d",
+              __func__, list_empty(&out->offload_cmd_list),
+              out->offload_state);
+        if (list_empty(&out->offload_cmd_list)) {
+            ALOGV("%s SLEEPING", __func__);
+            pthread_cond_wait(&out->offload_cond, &out->lock);
+            ALOGV("%s RUNNING", __func__);
+            continue;
+        }
+
+        item = list_head(&out->offload_cmd_list);
+        cmd = node_to_item(item, struct offload_cmd, node);
+        list_remove(item);
+
+        ALOGVV("%s STATE %d CMD %d out->compr %p",
+               __func__, out->offload_state, cmd->cmd, out->compr);
+
+        if (cmd->cmd == OFFLOAD_CMD_EXIT) {
+            free(cmd);
+            break;
+        }
+
+        if (out->compr == NULL) {
+            ALOGE("%s: Compress handle is NULL", __func__);
+            pthread_cond_signal(&out->cond);
+            continue;
+        }
+        out->offload_thread_blocked = true;
+        pthread_mutex_unlock(&out->lock);
+        send_callback = false;
+        switch(cmd->cmd) {
+        case OFFLOAD_CMD_WAIT_FOR_BUFFER:
+            compress_wait(out->compr, -1);
+            send_callback = true;
+            event = STREAM_CBK_EVENT_WRITE_READY;
+            break;
+        case OFFLOAD_CMD_PARTIAL_DRAIN:
+            compress_next_track(out->compr);
+            compress_partial_drain(out->compr);
+            send_callback = true;
+            event = STREAM_CBK_EVENT_DRAIN_READY;
+            break;
+        case OFFLOAD_CMD_DRAIN:
+            compress_drain(out->compr);
+            send_callback = true;
+            event = STREAM_CBK_EVENT_DRAIN_READY;
+            break;
+        default:
+            ALOGE("%s unknown command received: %d", __func__, cmd->cmd);
+            break;
+        }
+        pthread_mutex_lock(&out->lock);
+        out->offload_thread_blocked = false;
+        pthread_cond_signal(&out->cond);
+        if (send_callback) {
+            out->offload_callback(event, NULL, out->offload_cookie);
+        }
+        free(cmd);
+    }
+
+    pthread_cond_signal(&out->cond);
+    while (!list_empty(&out->offload_cmd_list)) {
+        item = list_head(&out->offload_cmd_list);
+        list_remove(item);
+        free(node_to_item(item, struct offload_cmd, node));
+    }
+    pthread_mutex_unlock(&out->lock);
+
+    return NULL;
+}
+
+static int create_offload_callback_thread(struct stream_out *out)
+{
+    pthread_cond_init(&out->offload_cond, (const pthread_condattr_t *) NULL);
+    list_init(&out->offload_cmd_list);
+    pthread_create(&out->offload_thread, (const pthread_attr_t *) NULL,
+                    offload_thread_loop, out);
+    return 0;
+}
+
+static int destroy_offload_callback_thread(struct stream_out *out)
+{
+    pthread_mutex_lock(&out->lock);
+    stop_compressed_output_l(out);
+    send_offload_cmd_l(out, OFFLOAD_CMD_EXIT);
+
+    pthread_mutex_unlock(&out->lock);
+    pthread_join(out->offload_thread, (void **) NULL);
+    pthread_cond_destroy(&out->offload_cond);
+
+    return 0;
+}
+
+static bool allow_hdmi_channel_config(struct audio_device *adev)
+{
+    struct listnode *node;
+    struct audio_usecase *usecase;
+    bool ret = true;
+
+    list_for_each(node, &adev->usecase_list) {
+        usecase = node_to_item(node, struct audio_usecase, list);
+        if (usecase->devices & AUDIO_DEVICE_OUT_AUX_DIGITAL) {
+            /*
+             * If voice call is already existing, do not proceed further to avoid
+             * disabling/enabling both RX and TX devices, CSD calls, etc.
+             * Once the voice call done, the HDMI channels can be configured to
+             * max channels of remaining use cases.
+             */
+            if (usecase->id == USECASE_VOICE_CALL) {
+                ALOGD("%s: voice call is active, no change in HDMI channels",
+                      __func__);
+                ret = false;
+                break;
+            } else if (usecase->id == USECASE_AUDIO_PLAYBACK_MULTI_CH) {
+                ALOGD("%s: multi channel playback is active, "
+                      "no change in HDMI channels", __func__);
+                ret = false;
+                break;
+            }
+        }
+    }
+    return ret;
+}
+
+static int check_and_set_hdmi_channels(struct audio_device *adev,
+                                       unsigned int channels)
+{
+    struct listnode *node;
+    struct audio_usecase *usecase;
+
+    /* Check if change in HDMI channel config is allowed */
+    if (!allow_hdmi_channel_config(adev))
+        return 0;
+
+    if (channels == adev->cur_hdmi_channels) {
+        ALOGD("%s: Requested channels are same as current", __func__);
+        return 0;
+    }
+
+    platform_set_hdmi_channels(adev->platform, channels);
+    adev->cur_hdmi_channels = channels;
+
+    /*
+     * Deroute all the playback streams routed to HDMI so that
+     * the back end is deactivated. Note that backend will not
+     * be deactivated if any one stream is connected to it.
+     */
+    list_for_each(node, &adev->usecase_list) {
+        usecase = node_to_item(node, struct audio_usecase, list);
+        if (usecase->type == PCM_PLAYBACK &&
+                usecase->devices & AUDIO_DEVICE_OUT_AUX_DIGITAL) {
+            disable_audio_route(adev, usecase, true);
+        }
+    }
+
+    /*
+     * Enable all the streams disabled above. Now the HDMI backend
+     * will be activated with new channel configuration
+     */
+    list_for_each(node, &adev->usecase_list) {
+        usecase = node_to_item(node, struct audio_usecase, list);
+        if (usecase->type == PCM_PLAYBACK &&
+                usecase->devices & AUDIO_DEVICE_OUT_AUX_DIGITAL) {
+            enable_audio_route(adev, usecase, true);
+        }
+    }
+
+    return 0;
+}
+
+static int stop_output_stream(struct stream_out *out)
+{
+    int i, ret = 0;
+    struct audio_usecase *uc_info;
+    struct audio_device *adev = out->dev;
+
+    ALOGV("%s: enter: usecase(%d: %s)", __func__,
+          out->usecase, use_case_table[out->usecase]);
+    uc_info = get_usecase_from_list(adev, out->usecase);
+    if (uc_info == NULL) {
+        ALOGE("%s: Could not find the usecase (%d) in the list",
+              __func__, out->usecase);
+        return -EINVAL;
+    }
+
+    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD &&
+            adev->visualizer_stop_output != NULL)
+        adev->visualizer_stop_output(out->handle);
+
+    /* 1. Get and set stream specific mixer controls */
+    disable_audio_route(adev, uc_info, true);
+
+    /* 2. Disable the rx device */
+    disable_snd_device(adev, uc_info->out_snd_device, true);
+
+    list_remove(&uc_info->list);
+    free(uc_info);
+
+    /* Must be called after removing the usecase from list */
+    if (out->devices & AUDIO_DEVICE_OUT_AUX_DIGITAL)
+        check_and_set_hdmi_channels(adev, DEFAULT_HDMI_OUT_CHANNELS);
+
+    ALOGV("%s: exit: status(%d)", __func__, ret);
+    return ret;
+}
+
+int start_output_stream(struct stream_out *out)
+{
+    int ret = 0;
+    struct audio_usecase *uc_info;
+    struct audio_device *adev = out->dev;
+
+    ALOGV("%s: enter: usecase(%d: %s) devices(%#x)",
+          __func__, out->usecase, use_case_table[out->usecase], out->devices);
+    out->pcm_device_id = platform_get_pcm_device_id(out->usecase, PCM_PLAYBACK);
+    if (out->pcm_device_id < 0) {
+        ALOGE("%s: Invalid PCM device id(%d) for the usecase(%d)",
+              __func__, out->pcm_device_id, out->usecase);
+        ret = -EINVAL;
+        goto error_config;
+    }
+
+    uc_info = (struct audio_usecase *)calloc(1, sizeof(struct audio_usecase));
+    uc_info->id = out->usecase;
+    uc_info->type = PCM_PLAYBACK;
+    uc_info->stream.out = out;
+    uc_info->devices = out->devices;
+    uc_info->in_snd_device = SND_DEVICE_NONE;
+    uc_info->out_snd_device = SND_DEVICE_NONE;
+
+    /* This must be called before adding this usecase to the list */
+    if (out->devices & AUDIO_DEVICE_OUT_AUX_DIGITAL)
+        check_and_set_hdmi_channels(adev, out->config.channels);
+
+    list_add_tail(&adev->usecase_list, &uc_info->list);
+
+    select_devices(adev, out->usecase);
+
+    ALOGV("%s: Opening PCM device card_id(%d) device_id(%d)",
+          __func__, 0, out->pcm_device_id);
+    if (out->usecase != USECASE_AUDIO_PLAYBACK_OFFLOAD) {
+        out->pcm = pcm_open(SOUND_CARD, out->pcm_device_id,
+                               PCM_OUT | PCM_MONOTONIC, &out->config);
+        if (out->pcm && !pcm_is_ready(out->pcm)) {
+            ALOGE("%s: %s", __func__, pcm_get_error(out->pcm));
+            pcm_close(out->pcm);
+            out->pcm = NULL;
+            ret = -EIO;
+            goto error_open;
+        }
+    } else {
+        out->pcm = NULL;
+        out->compr = compress_open(SOUND_CARD, out->pcm_device_id,
+                                   COMPRESS_IN, &out->compr_config);
+        if (out->compr && !is_compress_ready(out->compr)) {
+            ALOGE("%s: %s", __func__, compress_get_error(out->compr));
+            compress_close(out->compr);
+            out->compr = NULL;
+            ret = -EIO;
+            goto error_open;
+        }
+        if (out->offload_callback)
+            compress_nonblock(out->compr, out->non_blocking);
+
+        if (adev->visualizer_start_output != NULL)
+            adev->visualizer_start_output(out->handle);
+    }
+    ALOGV("%s: exit", __func__);
+    return 0;
+error_open:
+    stop_output_stream(out);
+error_config:
+    return ret;
+}
+
+static uint32_t out_get_sample_rate(const struct audio_stream *stream)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+
+    return out->sample_rate;
+}
+
+static int out_set_sample_rate(struct audio_stream *stream, uint32_t rate)
+{
+    return -ENOSYS;
+}
+
+static size_t out_get_buffer_size(const struct audio_stream *stream)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+
+    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD)
+        return out->compr_config.fragment_size;
+
+    return out->config.period_size * audio_stream_frame_size(stream);
+}
+
+static uint32_t out_get_channels(const struct audio_stream *stream)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+
+    return out->channel_mask;
+}
+
+static audio_format_t out_get_format(const struct audio_stream *stream)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+
+    return out->format;
+}
+
+static int out_set_format(struct audio_stream *stream, audio_format_t format)
+{
+    return -ENOSYS;
+}
+
+static int out_standby(struct audio_stream *stream)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+    struct audio_device *adev = out->dev;
+
+    ALOGV("%s: enter: usecase(%d: %s)", __func__,
+          out->usecase, use_case_table[out->usecase]);
+    if (out->usecase == USECASE_COMPRESS_VOIP_CALL) {
+        /* Ignore standby in case of voip call because the voip output
+         * stream is closed in adev_close_output_stream()
+         */
+        ALOGV("%s: Ignore Standby in VOIP call", __func__);
+        return 0;
+    }
+
+    pthread_mutex_lock(&out->lock);
+    pthread_mutex_lock(&adev->lock);
+    if (!out->standby) {
+        out->standby = true;
+        if (out->usecase != USECASE_AUDIO_PLAYBACK_OFFLOAD) {
+            if (out->pcm) {
+                pcm_close(out->pcm);
+                out->pcm = NULL;
+            }
+        } else {
+            stop_compressed_output_l(out);
+            out->gapless_mdata.encoder_delay = 0;
+            out->gapless_mdata.encoder_padding = 0;
+            if (out->compr != NULL) {
+                compress_close(out->compr);
+                out->compr = NULL;
+            }
+        }
+        stop_output_stream(out);
+    }
+    pthread_mutex_unlock(&adev->lock);
+    pthread_mutex_unlock(&out->lock);
+    ALOGV("%s: exit", __func__);
+    return 0;
+}
+
+static int out_dump(const struct audio_stream *stream, int fd)
+{
+    return 0;
+}
+
+static int parse_compress_metadata(struct stream_out *out, struct str_parms *parms)
+{
+    int ret = 0;
+    char value[32];
+    struct compr_gapless_mdata tmp_mdata;
+
+    if (!out || !parms) {
+        return -EINVAL;
+    }
+
+    ret = str_parms_get_str(parms, AUDIO_OFFLOAD_CODEC_DELAY_SAMPLES, value, sizeof(value));
+    if (ret >= 0) {
+        tmp_mdata.encoder_delay = atoi(value); //whats a good limit check?
+    } else {
+        return -EINVAL;
+    }
+
+    ret = str_parms_get_str(parms, AUDIO_OFFLOAD_CODEC_PADDING_SAMPLES, value, sizeof(value));
+    if (ret >= 0) {
+        tmp_mdata.encoder_padding = atoi(value);
+    } else {
+        return -EINVAL;
+    }
+
+    out->gapless_mdata = tmp_mdata;
+    out->send_new_metadata = 1;
+    ALOGV("%s new encoder delay %u and padding %u", __func__,
+          out->gapless_mdata.encoder_delay, out->gapless_mdata.encoder_padding);
+
+    return 0;
+}
+
+static int out_set_parameters(struct audio_stream *stream, const char *kvpairs)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+    struct audio_device *adev = out->dev;
+    struct audio_usecase *usecase;
+    struct listnode *node;
+    struct str_parms *parms;
+    char value[32];
+    int ret, val = 0;
+    bool select_new_device = false;
+
+    ALOGD("%s: enter: usecase(%d: %s) kvpairs: %s",
+          __func__, out->usecase, use_case_table[out->usecase], kvpairs);
+    parms = str_parms_create_str(kvpairs);
+    ret = str_parms_get_str(parms, AUDIO_PARAMETER_STREAM_ROUTING, value, sizeof(value));
+    if (ret >= 0) {
+        val = atoi(value);
+        pthread_mutex_lock(&out->lock);
+        pthread_mutex_lock(&adev->lock);
+
+        /*
+         * When HDMI cable is unplugged the music playback is paused and
+         * the policy manager sends routing=0. But the audioflinger
+         * continues to write data until standby time (3sec).
+         * As the HDMI core is turned off, the write gets blocked.
+         * Avoid this by routing audio to speaker until standby.
+         */
+        if (out->devices == AUDIO_DEVICE_OUT_AUX_DIGITAL &&
+                val == AUDIO_DEVICE_NONE) {
+            val = AUDIO_DEVICE_OUT_SPEAKER;
+        }
+
+        /*
+         * select_devices() call below switches all the usecases on the same
+         * backend to the new device. Refer to check_usecases_codec_backend() in
+         * the select_devices(). But how do we undo this?
+         *
+         * For example, music playback is active on headset (deep-buffer usecase)
+         * and if we go to ringtones and select a ringtone, low-latency usecase
+         * will be started on headset+speaker. As we can't enable headset+speaker
+         * and headset devices at the same time, select_devices() switches the music
+         * playback to headset+speaker while starting low-lateny usecase for ringtone.
+         * So when the ringtone playback is completed, how do we undo the same?
+         *
+         * We are relying on the out_set_parameters() call on deep-buffer output,
+         * once the ringtone playback is ended.
+         * NOTE: We should not check if the current devices are same as new devices.
+         *       Because select_devices() must be called to switch back the music
+         *       playback to headset.
+         */
+        if (val != 0) {
+            out->devices = val;
+
+            if (!out->standby)
+                select_devices(adev, out->usecase);
+        }
+
+        pthread_mutex_unlock(&adev->lock);
+        pthread_mutex_unlock(&out->lock);
+    }
+
+    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
+        parse_compress_metadata(out, parms);
+    }
+
+    str_parms_destroy(parms);
+    ALOGV("%s: exit: code(%d)", __func__, ret);
+    return ret;
+}
+
+static char* out_get_parameters(const struct audio_stream *stream, const char *keys)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+    struct str_parms *query = str_parms_create_str(keys);
+    char *str;
+    char value[256];
+    struct str_parms *reply = str_parms_create();
+    size_t i, j;
+    int ret;
+    bool first = true;
+    ALOGV("%s: enter: keys - %s", __func__, keys);
+    ret = str_parms_get_str(query, AUDIO_PARAMETER_STREAM_SUP_CHANNELS, value, sizeof(value));
+    if (ret >= 0) {
+        value[0] = '\0';
+        i = 0;
+        while (out->supported_channel_masks[i] != 0) {
+            for (j = 0; j < ARRAY_SIZE(out_channels_name_to_enum_table); j++) {
+                if (out_channels_name_to_enum_table[j].value == out->supported_channel_masks[i]) {
+                    if (!first) {
+                        strlcat(value, "|", sizeof(value));
+                    }
+                    strlcat(value, out_channels_name_to_enum_table[j].name, sizeof(value));
+                    first = false;
+                    break;
+                }
+            }
+            i++;
+        }
+        str_parms_add_str(reply, AUDIO_PARAMETER_STREAM_SUP_CHANNELS, value);
+        str = str_parms_to_str(reply);
+    }
+    str_parms_destroy(query);
+    str_parms_destroy(reply);
+    ALOGV("%s: exit: returns - %s", __func__, str);
+    return str;
+}
+
+static uint32_t out_get_latency(const struct audio_stream_out *stream)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+
+    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD)
+        return COMPRESS_OFFLOAD_PLAYBACK_LATENCY;
+
+    return (out->config.period_count * out->config.period_size * 1000) /
+           (out->config.rate);
+}
+
+static int out_set_volume(struct audio_stream_out *stream, float left,
+                          float right)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+    int volume[2];
+
+    if (out->usecase == USECASE_AUDIO_PLAYBACK_MULTI_CH) {
+        /* only take left channel into account: the API is for stereo anyway */
+        out->muted = (left == 0.0f);
+        return 0;
+    } else if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
+        const char *mixer_ctl_name = "Compress Playback Volume";
+        struct audio_device *adev = out->dev;
+        struct mixer_ctl *ctl;
+
+        ctl = mixer_get_ctl_by_name(adev->mixer, mixer_ctl_name);
+        if (!ctl) {
+            ALOGE("%s: Could not get ctl for mixer cmd - %s",
+                  __func__, mixer_ctl_name);
+            return -EINVAL;
+        }
+        volume[0] = (int)(left * COMPRESS_PLAYBACK_VOLUME_MAX);
+        volume[1] = (int)(right * COMPRESS_PLAYBACK_VOLUME_MAX);
+        mixer_ctl_set_array(ctl, volume, sizeof(volume)/sizeof(volume[0]));
+        return 0;
+    }
+
+    return -ENOSYS;
+}
+
+static ssize_t out_write(struct audio_stream_out *stream, const void *buffer,
+                         size_t bytes)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+    struct audio_device *adev = out->dev;
+    ssize_t ret = 0;
+
+    pthread_mutex_lock(&out->lock);
+    if (out->standby) {
+        out->standby = false;
+        pthread_mutex_lock(&adev->lock);
+            ret = start_output_stream(out);
+        pthread_mutex_unlock(&adev->lock);
+        /* ToDo: If use case is compress offload should return 0 */
+        if (ret != 0) {
+            out->standby = true;
+            goto exit;
+        }
+    }
+
+    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
+        ALOGVV("%s: writing buffer (%d bytes) to compress device", __func__, bytes);
+        if (out->send_new_metadata) {
+            ALOGVV("send new gapless metadata");
+            compress_set_gapless_metadata(out->compr, &out->gapless_mdata);
+            out->send_new_metadata = 0;
+        }
+
+        ret = compress_write(out->compr, buffer, bytes);
+        ALOGVV("%s: writing buffer (%d bytes) to compress device returned %d", __func__, bytes, ret);
+        if (ret >= 0 && ret < (ssize_t)bytes) {
+            send_offload_cmd_l(out, OFFLOAD_CMD_WAIT_FOR_BUFFER);
+        }
+        if (!out->playback_started) {
+            compress_start(out->compr);
+            out->playback_started = 1;
+            out->offload_state = OFFLOAD_STATE_PLAYING;
+        }
+        pthread_mutex_unlock(&out->lock);
+        return ret;
+    } else {
+        if (out->pcm) {
+            if (out->muted)
+                memset((void *)buffer, 0, bytes);
+            ALOGVV("%s: writing buffer (%d bytes) to pcm device", __func__, bytes);
+            ret = pcm_write(out->pcm, (void *)buffer, bytes);
+            if (ret == 0)
+                out->written += bytes / (out->config.channels * sizeof(short));
+        }
+    }
+
+exit:
+    pthread_mutex_unlock(&out->lock);
+
+    if (ret != 0) {
+        if (out->pcm)
+            ALOGE("%s: error %d - %s", __func__, ret, pcm_get_error(out->pcm));
+        out_standby(&out->stream.common);
+        usleep(bytes * 1000000 / audio_stream_frame_size(&out->stream.common) /
+               out_get_sample_rate(&out->stream.common));
+    }
+    return bytes;
+}
+
+static int out_get_render_position(const struct audio_stream_out *stream,
+                                   uint32_t *dsp_frames)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+    *dsp_frames = 0;
+    if ((out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) && (dsp_frames != NULL)) {
+        pthread_mutex_lock(&out->lock);
+        if (out->compr != NULL) {
+            compress_get_tstamp(out->compr, (unsigned long *)dsp_frames,
+                    &out->sample_rate);
+            ALOGVV("%s rendered frames %d sample_rate %d",
+                   __func__, *dsp_frames, out->sample_rate);
+        }
+        pthread_mutex_unlock(&out->lock);
+        return 0;
+    } else
+        return -EINVAL;
+}
+
+static int out_add_audio_effect(const struct audio_stream *stream, effect_handle_t effect)
+{
+    return 0;
+}
+
+static int out_remove_audio_effect(const struct audio_stream *stream, effect_handle_t effect)
+{
+    return 0;
+}
+
+static int out_get_next_write_timestamp(const struct audio_stream_out *stream,
+                                        int64_t *timestamp)
+{
+    return -EINVAL;
+}
+
+static int out_get_presentation_position(const struct audio_stream_out *stream,
+                                   uint64_t *frames, struct timespec *timestamp)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+    int ret = -1;
+    unsigned long dsp_frames;
+
+    pthread_mutex_lock(&out->lock);
+
+    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
+        if (out->compr != NULL) {
+            compress_get_tstamp(out->compr, &dsp_frames,
+                    &out->sample_rate);
+            ALOGVV("%s rendered frames %ld sample_rate %d",
+                   __func__, dsp_frames, out->sample_rate);
+            *frames = dsp_frames;
+            ret = 0;
+            /* this is the best we can do */
+            clock_gettime(CLOCK_MONOTONIC, timestamp);
+        }
+    } else {
+        if (out->pcm) {
+            size_t avail;
+            if (pcm_get_htimestamp(out->pcm, &avail, timestamp) == 0) {
+                size_t kernel_buffer_size = out->config.period_size * out->config.period_count;
+                int64_t signed_frames = out->written - kernel_buffer_size + avail;
+                // This adjustment accounts for buffering after app processor.
+                // It is based on estimated DSP latency per use case, rather than exact.
+                signed_frames -=
+                    (platform_render_latency(out->usecase) * out->sample_rate / 1000000LL);
+
+                // It would be unusual for this value to be negative, but check just in case ...
+                if (signed_frames >= 0) {
+                    *frames = signed_frames;
+                    ret = 0;
+                }
+            }
+        }
+    }
+
+    pthread_mutex_unlock(&out->lock);
+
+    return ret;
+}
+
+static int out_set_callback(struct audio_stream_out *stream,
+            stream_callback_t callback, void *cookie)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+
+    ALOGV("%s", __func__);
+    pthread_mutex_lock(&out->lock);
+    out->offload_callback = callback;
+    out->offload_cookie = cookie;
+    pthread_mutex_unlock(&out->lock);
+    return 0;
+}
+
+static int out_pause(struct audio_stream_out* stream)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+    int status = -ENOSYS;
+    ALOGV("%s", __func__);
+    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
+        pthread_mutex_lock(&out->lock);
+        if (out->compr != NULL && out->offload_state == OFFLOAD_STATE_PLAYING) {
+            status = compress_pause(out->compr);
+            out->offload_state = OFFLOAD_STATE_PAUSED;
+        }
+        pthread_mutex_unlock(&out->lock);
+    }
+    return status;
+}
+
+static int out_resume(struct audio_stream_out* stream)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+    int status = -ENOSYS;
+    ALOGV("%s", __func__);
+    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
+        status = 0;
+        pthread_mutex_lock(&out->lock);
+        if (out->compr != NULL && out->offload_state == OFFLOAD_STATE_PAUSED) {
+            status = compress_resume(out->compr);
+            out->offload_state = OFFLOAD_STATE_PLAYING;
+        }
+        pthread_mutex_unlock(&out->lock);
+    }
+    return status;
+}
+
+static int out_drain(struct audio_stream_out* stream, audio_drain_type_t type )
+{
+    struct stream_out *out = (struct stream_out *)stream;
+    int status = -ENOSYS;
+    ALOGV("%s", __func__);
+    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
+        pthread_mutex_lock(&out->lock);
+        if (type == AUDIO_DRAIN_EARLY_NOTIFY)
+            status = send_offload_cmd_l(out, OFFLOAD_CMD_PARTIAL_DRAIN);
+        else
+            status = send_offload_cmd_l(out, OFFLOAD_CMD_DRAIN);
+        pthread_mutex_unlock(&out->lock);
+    }
+    return status;
+}
+
+static int out_flush(struct audio_stream_out* stream)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+    ALOGV("%s", __func__);
+    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
+        pthread_mutex_lock(&out->lock);
+        stop_compressed_output_l(out);
+        pthread_mutex_unlock(&out->lock);
+        return 0;
+    }
+    return -ENOSYS;
+}
+
+int adev_open_output_stream(struct audio_hw_device *dev,
+                                   audio_io_handle_t handle,
+                                   audio_devices_t devices,
+                                   audio_output_flags_t flags,
+                                   struct audio_config *config,
+                                   struct audio_stream_out **stream_out)
+{
+    struct audio_device *adev = (struct audio_device *)dev;
+    struct stream_out *out;
+    int i, ret;
+
+    ALOGV("%s: enter: sample_rate(%d) channel_mask(%#x) devices(%#x) flags(%#x)",
+          __func__, config->sample_rate, config->channel_mask, devices, flags);
+    *stream_out = NULL;
+    out = (struct stream_out *)calloc(1, sizeof(struct stream_out));
+
+    if (devices == AUDIO_DEVICE_NONE)
+        devices = AUDIO_DEVICE_OUT_SPEAKER;
+
+    out->flags = flags;
+    out->devices = devices;
+    out->dev = adev;
+    out->format = config->format;
+    out->sample_rate = config->sample_rate;
+    out->channel_mask = AUDIO_CHANNEL_OUT_STEREO;
+    out->supported_channel_masks[0] = AUDIO_CHANNEL_OUT_STEREO;
+    out->handle = handle;
+
+    /* Init use case and pcm_config */
+    if (out->flags == AUDIO_OUTPUT_FLAG_DIRECT &&
+        out->devices & AUDIO_DEVICE_OUT_AUX_DIGITAL) {
+        pthread_mutex_lock(&adev->lock);
+        ret = read_hdmi_channel_masks(out);
+        pthread_mutex_unlock(&adev->lock);
+        if (ret != 0)
+            goto error_open;
+
+        if (config->sample_rate == 0)
+            config->sample_rate = DEFAULT_OUTPUT_SAMPLING_RATE;
+        if (config->channel_mask == 0)
+            config->channel_mask = AUDIO_CHANNEL_OUT_5POINT1;
+
+        out->channel_mask = config->channel_mask;
+        out->sample_rate = config->sample_rate;
+        out->usecase = USECASE_AUDIO_PLAYBACK_MULTI_CH;
+        out->config = pcm_config_hdmi_multi;
+        out->config.rate = config->sample_rate;
+        out->config.channels = popcount(out->channel_mask);
+        out->config.period_size = HDMI_MULTI_PERIOD_BYTES / (out->config.channels * 2);
+    } else if (out->flags & AUDIO_OUTPUT_FLAG_COMPRESS_OFFLOAD) {
+        if (config->offload_info.version != AUDIO_INFO_INITIALIZER.version ||
+            config->offload_info.size != AUDIO_INFO_INITIALIZER.size) {
+            ALOGE("%s: Unsupported Offload information", __func__);
+            ret = -EINVAL;
+            goto error_open;
+        }
+        if (!is_supported_format(config->offload_info.format)) {
+            ALOGE("%s: Unsupported audio format", __func__);
+            ret = -EINVAL;
+            goto error_open;
+        }
+
+        out->compr_config.codec = (struct snd_codec *)
+                                    calloc(1, sizeof(struct snd_codec));
+
+        out->usecase = USECASE_AUDIO_PLAYBACK_OFFLOAD;
+        if (config->offload_info.channel_mask)
+            out->channel_mask = config->offload_info.channel_mask;
+        else if (config->channel_mask)
+            out->channel_mask = config->channel_mask;
+        out->format = config->offload_info.format;
+        out->sample_rate = config->offload_info.sample_rate;
+
+        out->stream.set_callback = out_set_callback;
+        out->stream.pause = out_pause;
+        out->stream.resume = out_resume;
+        out->stream.drain = out_drain;
+        out->stream.flush = out_flush;
+
+        out->compr_config.codec->id =
+                get_snd_codec_id(config->offload_info.format);
+        out->compr_config.fragment_size = COMPRESS_OFFLOAD_FRAGMENT_SIZE;
+        out->compr_config.fragments = COMPRESS_OFFLOAD_NUM_FRAGMENTS;
+        out->compr_config.codec->sample_rate =
+                    compress_get_alsa_rate(config->offload_info.sample_rate);
+        out->compr_config.codec->bit_rate =
+                    config->offload_info.bit_rate;
+        out->compr_config.codec->ch_in =
+                    popcount(config->channel_mask);
+        out->compr_config.codec->ch_out = out->compr_config.codec->ch_in;
+
+        if (flags & AUDIO_OUTPUT_FLAG_NON_BLOCKING)
+            out->non_blocking = 1;
+
+        out->send_new_metadata = 1;
+        create_offload_callback_thread(out);
+        ALOGV("%s: offloaded output offload_info version %04x bit rate %d",
+                __func__, config->offload_info.version,
+                config->offload_info.bit_rate);
+    } else if (out->flags & AUDIO_OUTPUT_FLAG_FAST) {
+        out->usecase = USECASE_AUDIO_PLAYBACK_LOW_LATENCY;
+        out->config = pcm_config_low_latency;
+        out->sample_rate = out->config.rate;
+    } else {
+        out->usecase = USECASE_AUDIO_PLAYBACK_DEEP_BUFFER;
+        out->config = pcm_config_deep_buffer;
+        out->sample_rate = out->config.rate;
+    }
+
+    if (flags & AUDIO_OUTPUT_FLAG_PRIMARY) {
+        if(adev->primary_output == NULL)
+            adev->primary_output = out;
+        else {
+            ALOGE("%s: Primary output is already opened", __func__);
+            ret = -EEXIST;
+            goto error_open;
+        }
+    }
+
+    /* Check if this usecase is already existing */
+    pthread_mutex_lock(&adev->lock);
+    if (get_usecase_from_list(adev, out->usecase) != NULL) {
+        ALOGE("%s: Usecase (%d) is already present", __func__, out->usecase);
+        pthread_mutex_unlock(&adev->lock);
+        ret = -EEXIST;
+        goto error_open;
+    }
+    pthread_mutex_unlock(&adev->lock);
+
+    out->stream.common.get_sample_rate = out_get_sample_rate;
+    out->stream.common.set_sample_rate = out_set_sample_rate;
+    out->stream.common.get_buffer_size = out_get_buffer_size;
+    out->stream.common.get_channels = out_get_channels;
+    out->stream.common.get_format = out_get_format;
+    out->stream.common.set_format = out_set_format;
+    out->stream.common.standby = out_standby;
+    out->stream.common.dump = out_dump;
+    out->stream.common.set_parameters = out_set_parameters;
+    out->stream.common.get_parameters = out_get_parameters;
+    out->stream.common.add_audio_effect = out_add_audio_effect;
+    out->stream.common.remove_audio_effect = out_remove_audio_effect;
+    out->stream.get_latency = out_get_latency;
+    out->stream.set_volume = out_set_volume;
+    out->stream.write = out_write;
+    out->stream.get_render_position = out_get_render_position;
+    out->stream.get_next_write_timestamp = out_get_next_write_timestamp;
+    out->stream.get_presentation_position = out_get_presentation_position;
+
+    out->standby = 1;
+    /* out->muted = false; by calloc() */
+    /* out->written = 0; by calloc() */
+
+    pthread_mutex_init(&out->lock, (const pthread_mutexattr_t *) NULL);
+    pthread_cond_init(&out->cond, (const pthread_condattr_t *) NULL);
+
+    config->format = out->stream.common.get_format(&out->stream.common);
+    config->channel_mask = out->stream.common.get_channels(&out->stream.common);
+    config->sample_rate = out->stream.common.get_sample_rate(&out->stream.common);
+
+    *stream_out = &out->stream;
+    ALOGV("%s: exit", __func__);
+    return 0;
+
+error_open:
+    free(out);
+    *stream_out = NULL;
+    ALOGD("%s: exit: ret %d", __func__, ret);
+    return ret;
+}
+
+void adev_close_output_stream(struct audio_hw_device *dev,
+                                     struct audio_stream_out *stream)
+{
+    struct stream_out *out = (struct stream_out *)stream;
+    struct audio_device *adev = out->dev;
+    int ret = 0;
+
+    ALOGV("%s: enter", __func__);
+    out_standby(&stream->common);
+
+    if (out->usecase == USECASE_AUDIO_PLAYBACK_OFFLOAD) {
+        destroy_offload_callback_thread(out);
+
+        if (out->compr_config.codec != NULL)
+            free(out->compr_config.codec);
+    }
+    pthread_cond_destroy(&out->cond);
+    pthread_mutex_destroy(&out->lock);
+    free(stream);
+    ALOGV("%s: exit", __func__);
+}