btif/src/btif_media_task.c

/******************************************************************************
 *
 *  Copyright (C) 2009-2012 Broadcom Corporation
 *  Copyright (c) 2013, Linux Foundation. All rights reserved.
 *
 *  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.
 *
 ******************************************************************************/

/******************************************************************************
 **
 **  Name:          btif_media_task.c
 **
 **  Description:   This is the multimedia module for the BTIF system.  It
 **                 contains task implementations AV, HS and HF profiles
 **                 audio & video processing
 **
 ******************************************************************************/


#define ATRACE_TAG ATRACE_TAG_ALWAYS

#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <pthread.h>
#include <stdint.h>
#include <sys/time.h>
#include <errno.h>

#include "bt_target.h"
#include "gki.h"
#include "bta_api.h"
#include "btu.h"
#include "bta_sys.h"
#include "bta_sys_int.h"

#include "bta_av_api.h"
#include "a2d_api.h"
#include "a2d_sbc.h"
#include "a2d_int.h"
#include "bta_av_sbc.h"
#include "bta_av_ci.h"
#include "l2c_api.h"

#include "btif_av_co.h"
#include "btif_media.h"

#if (BTA_AV_INCLUDED == TRUE)
#include "sbc_encoder.h"
#endif

#define LOG_TAG "BTIF-MEDIA"

#include <hardware/bluetooth.h>
#include "audio_a2dp_hw.h"
#include "btif_av.h"
#include "btif_sm.h"
#include "btif_util.h"
#if (BTA_AV_SINK_INCLUDED == TRUE)
#include "oi_codec_sbc.h"
#include "oi_status.h"
#endif

#ifdef AVK_BACKPORT
#include "bluetoothTrack.h"
#endif

#include "stdio.h"
#include <dlfcn.h>

//#define DEBUG_MEDIA_AV_FLOW TRUE

#if (BTA_AV_SINK_INCLUDED == TRUE)
OI_CODEC_SBC_DECODER_CONTEXT context;
OI_UINT32 contextData[CODEC_DATA_WORDS(2, SBC_CODEC_FAST_FILTER_BUFFERS)];
OI_INT16 pcmData[15*SBC_MAX_SAMPLES_PER_FRAME*SBC_MAX_CHANNELS];
#endif

#include <cutils/trace.h>
#include <cutils/properties.h>
/*****************************************************************************
 **  Constants
 *****************************************************************************/

#ifndef AUDIO_CHANNEL_OUT_MONO
#define AUDIO_CHANNEL_OUT_MONO 0x01
#endif

#ifndef AUDIO_CHANNEL_OUT_STEREO
#define AUDIO_CHANNEL_OUT_STEREO 0x03
#endif

/* BTIF media task gki event definition */
#define BTIF_MEDIA_TASK_CMD TASK_MBOX_0_EVT_MASK
#define BTIF_MEDIA_TASK_DATA TASK_MBOX_1_EVT_MASK

#define BTIF_MEDIA_TASK_KILL EVENT_MASK(GKI_SHUTDOWN_EVT)

#define BTIF_MEDIA_AA_TASK_TIMER_ID TIMER_0
#define BTIF_MEDIA_AV_TASK_TIMER_ID TIMER_1
#define BTIF_MEDIA_AVK_TASK_TIMER_ID TIMER_2

#define BTIF_MEDIA_AA_TASK_TIMER TIMER_0_EVT_MASK
#define BTIF_MEDIA_AV_TASK_TIMER TIMER_1_EVT_MASK
#define BTIF_MEDIA_AVK_TASK_TIMER TIMER_2_EVT_MASK


#define BTIF_MEDIA_TASK_CMD_MBOX        TASK_MBOX_0     /* cmd mailbox  */
#define BTIF_MEDIA_TASK_DATA_MBOX       TASK_MBOX_1     /* data mailbox  */


/* BTIF media cmd event definition : BTIF_MEDIA_TASK_CMD */
enum
{
    BTIF_MEDIA_START_AA_TX = 1,
    BTIF_MEDIA_STOP_AA_TX,
    BTIF_MEDIA_AA_RX_RDY,
    BTIF_MEDIA_UIPC_RX_RDY,
    BTIF_MEDIA_SBC_ENC_INIT,
    BTIF_MEDIA_SBC_ENC_UPDATE,
    BTIF_MEDIA_SBC_DEC_INIT,
    BTIF_MEDIA_VIDEO_DEC_INIT,
    BTIF_MEDIA_FLUSH_AA_TX,
    BTIF_MEDIA_FLUSH_AA_RX,
    BTIF_MEDIA_AUDIO_FEEDING_INIT,
    BTIF_MEDIA_AUDIO_RECEIVING_INIT,
    BTIF_MEDIA_AUDIO_SINK_CFG_UPDATE,
    BTIF_MEDIA_AUDIO_SINK_START_DECODING,
    BTIF_MEDIA_AUDIO_SINK_STOP_DECODING,
    BTIF_MEDIA_AUDIO_SINK_CLEAR_TRACK
};

enum {
    MEDIA_TASK_STATE_OFF = 0,
    MEDIA_TASK_STATE_ON = 1,
    MEDIA_TASK_STATE_SHUTTING_DOWN = 2
};

/* Macro to multiply the media task tick */
#ifndef BTIF_MEDIA_NUM_TICK
#define BTIF_MEDIA_NUM_TICK      1
#endif

/* Media task tick in milliseconds, must be set to multiple of
   (1000/TICKS_PER_SEC) (10) */

#define BTIF_MEDIA_TIME_TICK                     (20 * BTIF_MEDIA_NUM_TICK)
#define A2DP_DATA_READ_POLL_MS    (BTIF_MEDIA_TIME_TICK / 2)
#define BTIF_SINK_MEDIA_TIME_TICK                (20 * BTIF_MEDIA_NUM_TICK)


/* buffer pool */
#define BTIF_MEDIA_AA_POOL_ID GKI_POOL_ID_3
#define BTIF_MEDIA_AA_BUF_SIZE GKI_BUF3_SIZE

/* offset */
#if (BTA_AV_CO_CP_SCMS_T == TRUE)
#define BTIF_MEDIA_AA_SBC_OFFSET (AVDT_MEDIA_OFFSET + BTA_AV_SBC_HDR_SIZE + 1)
#else
#define BTIF_MEDIA_AA_SBC_OFFSET (AVDT_MEDIA_OFFSET + BTA_AV_SBC_HDR_SIZE)
#endif

/* Define the bitrate step when trying to match bitpool value */
#ifndef BTIF_MEDIA_BITRATE_STEP
#define BTIF_MEDIA_BITRATE_STEP 5
#endif

/* Middle quality quality setting @ 44.1 khz */
#define DEFAULT_SBC_BITRATE 328

#ifndef BTIF_A2DP_NON_EDR_MAX_RATE
#define BTIF_A2DP_NON_EDR_MAX_RATE 229
#endif

#ifndef A2DP_MEDIA_TASK_STACK_SIZE
#define A2DP_MEDIA_TASK_STACK_SIZE       0x2000         /* In bytes */
#endif

#if (BTA_AV_CO_CP_SCMS_T == TRUE)
/* A2DP header will contain a CP header of size 1 */
#define A2DP_HDR_SIZE               2
#else
#define A2DP_HDR_SIZE               1
#endif
#define MAX_SBC_HQ_FRAME_SIZE_44_1  119
#define MAX_SBC_HQ_FRAME_SIZE_48    115

/* 2DH5 payload size (679 bytes) - (4 bytes L2CAP Header + 12 bytes AVDTP Header) */
#define MAX_2MBPS_AVDTP_MTU         663

#define A2DP_MEDIA_TASK_TASK_STR        ((INT8 *) "A2DP-MEDIA")
static UINT32 a2dp_media_task_stack[(A2DP_MEDIA_TASK_STACK_SIZE + 3) / 4];

#define BT_MEDIA_TASK A2DP_MEDIA_TASK

#define USEC_PER_SEC 1000000L
#define TPUT_STATS_INTERVAL_US (3000*1000)

/*
 * CONGESTION COMPENSATION CTRL ::
 *
 * Thus setting controls how many buffers we will hold in media task
 * during temp link congestion. Together with the stack buffer queues
 * it controls much temporary a2dp link congestion we can
 * compensate for. It however also depends on the default run level of sinks
 * jitterbuffers. Depending on type of sink this would vary.
 * Ideally the (SRC) max tx buffer capacity should equal the sinks
 * jitterbuffer runlevel including any intermediate buffers on the way
 * towards the sinks codec.
 */

/* fixme -- define this in pcm time instead of buffer count */

/* The typical runlevel of the tx queue size is ~1 buffer
   but due to link flow control or thread preemption in lower
   layers we might need to temporarily buffer up data */

/* 18 frames is equivalent to 6.89*18*2.9 ~= 360 ms @ 44.1 khz, 20 ms mediatick */
#define MAX_SINK_A2DP_FRAME_QUEUE_SZ 18

/* Allow up to 360ms of buffered A2DP data */
#define MAX_OUTPUT_A2DP_QUEUE_MS 360

#ifndef MAX_PCM_FRAME_NUM_PER_TICK
#ifdef SAMPLE_RATE_48K
/* If a frame is 512 bytes and a tick is 3840 bytes (48K) then allow up to
 * two full ticks to be sent per tick which is 9680 / 512 = 18
 */
#define MAX_PCM_FRAME_NUM_PER_TICK 18
#else
#define MAX_PCM_FRAME_NUM_PER_TICK 14
#endif
#endif

#define MAX_PCM_ITER_NUM_PER_TICK     2

//#define BTIF_MEDIA_VERBOSE_ENABLED
/* In case of A2DP SINK, we will delay start by 5 AVDTP Packets*/
#define MAX_A2DP_DELAYED_START_FRAME_COUNT 1
#define PACKET_PLAYED_PER_TICK_48 8
#define PACKET_PLAYED_PER_TICK_44 7
#define PACKET_PLAYED_PER_TICK_32 5
#define PACKET_PLAYED_PER_TICK_16 3


#ifdef BTIF_MEDIA_VERBOSE_ENABLED
#define VERBOSE(fmt, ...) \
      LogMsg( TRACE_CTRL_GENERAL | TRACE_LAYER_NONE | TRACE_ORG_APPL | \
              TRACE_TYPE_ERROR, fmt, ## __VA_ARGS__)
#else
#define VERBOSE(fmt, ...)
#endif

/*****************************************************************************
 **  Data types
 *****************************************************************************/
typedef struct
{
    UINT16 num_frames_to_be_processed;
    UINT16 len;
    UINT16 offset;
    UINT16 layer_specific;
} tBT_SBC_HDR;

typedef struct
{
    UINT32 aa_frame_counter;
    INT32  aa_feed_counter;
    INT32  aa_feed_residue;
    UINT32 counter;
    UINT32 bytes_per_tick;  /* pcm bytes read each media task tick */
} tBTIF_AV_MEDIA_FEEDINGS_PCM_STATE;


typedef union
{
    tBTIF_AV_MEDIA_FEEDINGS_PCM_STATE pcm;
} tBTIF_AV_MEDIA_FEEDINGS_STATE;

typedef struct
{
#if (BTA_AV_INCLUDED == TRUE)
    BUFFER_Q TxAaQ;
    BUFFER_Q RxSbcQ;
    BOOLEAN is_tx_timer;
    BOOLEAN is_rx_timer;
    UINT16 TxAaMtuSize;
    UINT32 timestamp;
    UINT8 TxTranscoding;
    tBTIF_AV_FEEDING_MODE feeding_mode;
    tBTIF_AV_MEDIA_FEEDINGS media_feeding;
    tBTIF_AV_MEDIA_FEEDINGS_STATE media_feeding_state;
    SBC_ENC_PARAMS encoder;
    UINT8 busy_level;
    void* av_sm_hdl;
    UINT8 a2dp_cmd_pending; /* we can have max one command pending */
    BOOLEAN tx_flush; /* discards any outgoing data when true */
    BOOLEAN rx_flush; /* discards any incoming data when true */
    UINT8 peer_sep;
    BOOLEAN data_channel_open;
    UINT8   frames_to_process;

    UINT32  sample_rate;
    UINT8   channel_count;
#ifdef AVK_BACKPORT
    btif_media_AudioFocus_state rx_audio_focus_gained;
#endif
    UINT8 TxNumSBCFrames;
#endif

} tBTIF_MEDIA_CB;

typedef struct {
    long long rx;
    long long rx_tot;
    long long tx;
    long long tx_tot;
    long long ts_prev_us;
} t_stat;

/*****************************************************************************
 **  Local data
 *****************************************************************************/

static tBTIF_MEDIA_CB btif_media_cb;
static int media_task_running = MEDIA_TASK_STATE_OFF;
static UINT64 last_frame_us = 0;


/*****************************************************************************
 **  Local functions
 *****************************************************************************/

static void btif_a2dp_data_cb(tUIPC_CH_ID ch_id, tUIPC_EVENT event);
static void btif_a2dp_ctrl_cb(tUIPC_CH_ID ch_id, tUIPC_EVENT event);
static void btif_a2dp_encoder_update(void);
const char* dump_media_event(UINT16 event);
#if (BTA_AV_SINK_INCLUDED == TRUE)
extern OI_STATUS OI_CODEC_SBC_DecodeFrame(OI_CODEC_SBC_DECODER_CONTEXT *context,
                                          const OI_BYTE **frameData,
                                          unsigned long *frameBytes,
                                          OI_INT16 *pcmData,
                                          unsigned long *pcmBytes);
extern OI_STATUS OI_CODEC_SBC_DecoderReset(OI_CODEC_SBC_DECODER_CONTEXT *context,
                                           unsigned long *decoderData,
                                           unsigned long decoderDataBytes,
                                           OI_UINT8 maxChannels,
                                           OI_UINT8 pcmStride,
                                           OI_BOOL enhanced);
#endif
static void btif_media_flush_q(BUFFER_Q *p_q);
static void btif_media_task_aa_handle_stop_decoding(void );
static void btif_media_task_aa_rx_flush(void);
static BOOLEAN btif_media_task_stop_decoding_req(void);
static UINT8 check_for_max_number_of_frames_per_packet();


/*****************************************************************************
 **  Externs
 *****************************************************************************/

static void btif_media_task_handle_cmd(BT_HDR *p_msg);
static void btif_media_task_handle_media(BT_HDR*p_msg);
/* Handle incoming media packets A2DP SINK streaming*/
#if (BTA_AV_SINK_INCLUDED == TRUE)
static void btif_media_task_handle_inc_media(tBT_SBC_HDR*p_msg);
#endif

#if (BTA_AV_INCLUDED == TRUE)
static void btif_media_send_aa_frame(void);
static void btif_media_task_feeding_state_reset(void);
static void btif_media_task_aa_start_tx(void);
static void btif_media_task_aa_stop_tx(void);
static void btif_media_task_enc_init(BT_HDR *p_msg);
static void btif_media_task_enc_update(BT_HDR *p_msg);
static void btif_media_task_audio_feeding_init(BT_HDR *p_msg);
static void btif_media_task_aa_tx_flush(BT_HDR *p_msg);
static void btif_media_aa_prep_2_send(UINT8 nb_frame);
#if (BTA_AV_SINK_INCLUDED == TRUE)
static void btif_media_task_aa_handle_decoder_reset(BT_HDR *p_msg);
static void btif_media_task_aa_handle_clear_track(void);
#endif
static void btif_media_task_aa_handle_start_decoding(void );
#endif
BOOLEAN btif_media_task_start_decoding_req(void);
BOOLEAN btif_media_task_clear_track(void);
extern BOOLEAN btif_hf_is_call_idle();

static int bt_systrace_log_enabled=0;

/*****************************************************************************
 **  Misc helper functions
 *****************************************************************************/
int med_task_perf_systrace_enabled() {
  char value[PROPERTY_VALUE_MAX] = {'\0'};
  property_get("bt_audio_systrace_log", value, "false");
  bt_systrace_log_enabled = (strcmp(value, "true") == 0);
  return bt_systrace_log_enabled;
}

static void log_tstamps_us(char *comment)
{
    #define USEC_PER_MSEC 1000L
    static UINT64 prev_us = 0;
    const UINT64 now_us = GKI_now_us();
    static UINT64 diff_us = 0;

    diff_us = now_us - prev_us;
    if ((diff_us / USEC_PER_MSEC) > (BTIF_MEDIA_TIME_TICK + 10))
    {
        APPL_TRACE_ERROR("[%s] ts %08llu, diff : %08llu, queue sz %d", comment, now_us, diff_us,
                btif_media_cb.TxAaQ.count);
    }
    else
    {
        APPL_TRACE_DEBUG("[%s] ts %08llu, diff : %08llu, queue sz %d", comment, now_us, diff_us,
                btif_media_cb.TxAaQ.count);
    }
    prev_us = now_us;
}

const char* dump_media_event(UINT16 event)
{
    switch(event)
    {
        CASE_RETURN_STR(BTIF_MEDIA_START_AA_TX)
        CASE_RETURN_STR(BTIF_MEDIA_STOP_AA_TX)
        CASE_RETURN_STR(BTIF_MEDIA_AA_RX_RDY)
        CASE_RETURN_STR(BTIF_MEDIA_UIPC_RX_RDY)
        CASE_RETURN_STR(BTIF_MEDIA_SBC_ENC_INIT)
        CASE_RETURN_STR(BTIF_MEDIA_SBC_ENC_UPDATE)
        CASE_RETURN_STR(BTIF_MEDIA_SBC_DEC_INIT)
        CASE_RETURN_STR(BTIF_MEDIA_VIDEO_DEC_INIT)
        CASE_RETURN_STR(BTIF_MEDIA_FLUSH_AA_TX)
        CASE_RETURN_STR(BTIF_MEDIA_FLUSH_AA_RX)
        CASE_RETURN_STR(BTIF_MEDIA_AUDIO_FEEDING_INIT)
        CASE_RETURN_STR(BTIF_MEDIA_AUDIO_RECEIVING_INIT)
        CASE_RETURN_STR(BTIF_MEDIA_AUDIO_SINK_CFG_UPDATE)
        CASE_RETURN_STR(BTIF_MEDIA_AUDIO_SINK_START_DECODING)
        CASE_RETURN_STR(BTIF_MEDIA_AUDIO_SINK_STOP_DECODING)
        CASE_RETURN_STR(BTIF_MEDIA_AUDIO_SINK_CLEAR_TRACK)

        default:
            return "UNKNOWN MEDIA EVENT";
    }
}

static inline UINT32 compute_pcm_bytes_per_frame(void)
{
    return btif_media_cb.encoder.s16NumOfSubBands *
           btif_media_cb.encoder.s16NumOfBlocks *
           btif_media_cb.media_feeding.cfg.pcm.num_channel *
           btif_media_cb.media_feeding.cfg.pcm.bit_per_sample / 8;
}

/*****************************************************************************
 **  A2DP CTRL PATH
 *****************************************************************************/

static const char* dump_a2dp_ctrl_event(UINT8 event)
{
    switch(event)
    {
        CASE_RETURN_STR(A2DP_CTRL_CMD_NONE)
        CASE_RETURN_STR(A2DP_CTRL_CMD_CHECK_READY)
        CASE_RETURN_STR(A2DP_CTRL_CMD_START)
        CASE_RETURN_STR(A2DP_CTRL_CMD_STOP)
        CASE_RETURN_STR(A2DP_CTRL_CMD_SUSPEND)
        default:
            return "UNKNOWN MSG ID";
    }
}

static void btif_audiopath_detached(void)
{
    APPL_TRACE_EVENT("## AUDIO PATH DETACHED ##");

    /*  send stop request only if we are actively streaming and haven't received
        a stop request. Potentially audioflinger detached abnormally */
    if (btif_media_cb.is_tx_timer)
    {
        /* post stop event and wait for audio path to stop */
        btif_dispatch_sm_event(BTIF_AV_STOP_STREAM_REQ_EVT, NULL, 0);
    }
}

static void a2dp_cmd_acknowledge(int status)
{
    UINT8 ack = status;

    APPL_TRACE_EVENT("## a2dp ack : %s, status %d ##",
          dump_a2dp_ctrl_event(btif_media_cb.a2dp_cmd_pending), status);

    /* sanity check */
    if (btif_media_cb.a2dp_cmd_pending == A2DP_CTRL_CMD_NONE)
    {
        APPL_TRACE_ERROR("warning : no command pending, ignore ack");
        return;
    }

    /* clear pending */
    btif_media_cb.a2dp_cmd_pending = A2DP_CTRL_CMD_NONE;

    /* acknowledge start request */
    UIPC_Send(UIPC_CH_ID_AV_CTRL, 0, &ack, 1);
}


static void btif_recv_ctrl_data(void)
{
    UINT8 cmd = 0;
    int n;
    n = UIPC_Read(UIPC_CH_ID_AV_CTRL, NULL, &cmd, 1);

    /* detach on ctrl channel means audioflinger process was terminated */
    if (n == 0)
    {
        APPL_TRACE_EVENT("CTRL CH DETACHED");
        UIPC_Close(UIPC_CH_ID_AV_CTRL);
        /* we can operate only on datachannel, if af client wants to
           do send additional commands the ctrl channel would be reestablished */
        //btif_audiopath_detached();
        return;
    }

    APPL_TRACE_DEBUG("a2dp-ctrl-cmd : %s", dump_a2dp_ctrl_event(cmd));

    btif_media_cb.a2dp_cmd_pending = cmd;

    switch(cmd)
    {
        case A2DP_CTRL_CMD_CHECK_READY:

            if (media_task_running == MEDIA_TASK_STATE_SHUTTING_DOWN)
            {
                a2dp_cmd_acknowledge(A2DP_CTRL_ACK_FAILURE);
                return;
            }

            /* check whether av is ready to setup a2dp datapath */
            if ((btif_av_stream_ready() == TRUE) || (btif_av_stream_started_ready() == TRUE))
            {
                a2dp_cmd_acknowledge(A2DP_CTRL_ACK_SUCCESS);
            }
            else
            {
                a2dp_cmd_acknowledge(A2DP_CTRL_ACK_FAILURE);
            }
            break;

        case A2DP_CTRL_CMD_CHECK_STREAM_STARTED:

            if((btif_av_stream_started_ready() == TRUE))
                a2dp_cmd_acknowledge(A2DP_CTRL_ACK_SUCCESS);
            else
                a2dp_cmd_acknowledge(A2DP_CTRL_ACK_FAILURE);
            break;

        case A2DP_CTRL_CMD_START:
            /* Dont sent START request to stack while we are in call.
               Some headsets like Sony MW600, dont allow AVDTP START
               in call and respond BAD_STATE */
            if (!btif_hf_is_call_idle())
            {
                a2dp_cmd_acknowledge(A2DP_CTRL_ACK_INCALL_FAILURE);
                break;
            }

            if (btif_av_stream_ready() == TRUE)
            {
                /* setup audio data channel listener */
                UIPC_Open(UIPC_CH_ID_AV_AUDIO, btif_a2dp_data_cb);

                /* post start event and wait for audio path to open */
                btif_dispatch_sm_event(BTIF_AV_START_STREAM_REQ_EVT, NULL, 0);

#if (BTA_AV_SINK_INCLUDED == TRUE)
                if (btif_media_cb.peer_sep == AVDT_TSEP_SRC)
                    a2dp_cmd_acknowledge(A2DP_CTRL_ACK_SUCCESS);
#endif
            }
            else if (btif_av_stream_started_ready())
            {
                /* already started, setup audio data channel listener
                   and ack back immediately */
                UIPC_Open(UIPC_CH_ID_AV_AUDIO, btif_a2dp_data_cb);

                a2dp_cmd_acknowledge(A2DP_CTRL_ACK_SUCCESS);
            }
            else
            {
                a2dp_cmd_acknowledge(A2DP_CTRL_ACK_FAILURE);
                break;
            }
            break;

        case A2DP_CTRL_CMD_STOP:
            if (btif_media_cb.peer_sep == AVDT_TSEP_SNK && btif_media_cb.is_tx_timer == FALSE)
            {
                /* we are already stopped, just ack back */
                a2dp_cmd_acknowledge(A2DP_CTRL_ACK_SUCCESS);
                break;
            }

            btif_dispatch_sm_event(BTIF_AV_STOP_STREAM_REQ_EVT, NULL, 0);
            a2dp_cmd_acknowledge(A2DP_CTRL_ACK_SUCCESS);
            break;

        case A2DP_CTRL_CMD_SUSPEND:
            /* local suspend */
            if (btif_av_stream_started_ready())
            {
                btif_dispatch_sm_event(BTIF_AV_SUSPEND_STREAM_REQ_EVT, NULL, 0);
            }
            else
            {
                /* if we are not in started state, just ack back ok and let
                   audioflinger close the channel. This can happen if we are
                   remotely suspended , clear REMOTE SUSPEND Flag */
                btif_av_clear_remote_suspend_flag();
                a2dp_cmd_acknowledge(A2DP_CTRL_ACK_SUCCESS);
            }
            break;

        case A2DP_CTRL_GET_AUDIO_CONFIG:
        {
            uint32_t sample_rate = btif_media_cb.sample_rate;
            uint8_t channel_count = btif_media_cb.channel_count;

            a2dp_cmd_acknowledge(A2DP_CTRL_ACK_SUCCESS);
            UIPC_Send(UIPC_CH_ID_AV_CTRL, 0, (UINT8 *)&sample_rate, 4);
            UIPC_Send(UIPC_CH_ID_AV_CTRL, 0, &channel_count, 1);
            break;
        }

        default:
            APPL_TRACE_ERROR("UNSUPPORTED CMD (%d)", cmd);
            a2dp_cmd_acknowledge(A2DP_CTRL_ACK_FAILURE);
            break;
    }
    APPL_TRACE_DEBUG("a2dp-ctrl-cmd : %s DONE", dump_a2dp_ctrl_event(cmd));
}

static void btif_a2dp_ctrl_cb(tUIPC_CH_ID ch_id, tUIPC_EVENT event)
{
    UNUSED(ch_id);

    APPL_TRACE_DEBUG("A2DP-CTRL-CHANNEL EVENT %s", dump_uipc_event(event));

    switch(event)
    {
        case UIPC_OPEN_EVT:
            /* fetch av statemachine handle */
            btif_media_cb.av_sm_hdl = btif_av_get_sm_handle();
            break;

        case UIPC_CLOSE_EVT:
            /* restart ctrl server unless we are shutting down */
            if (media_task_running == MEDIA_TASK_STATE_ON)
                UIPC_Open(UIPC_CH_ID_AV_CTRL , btif_a2dp_ctrl_cb);
            break;

        case UIPC_RX_DATA_READY_EVT:
            btif_recv_ctrl_data();
            break;

        default :
            APPL_TRACE_ERROR("### A2DP-CTRL-CHANNEL EVENT %d NOT HANDLED ###", event);
            break;
    }
}

static void btif_a2dp_data_cb(tUIPC_CH_ID ch_id, tUIPC_EVENT event)
{
    UNUSED(ch_id);

    APPL_TRACE_DEBUG("BTIF MEDIA (A2DP-DATA) EVENT %s", dump_uipc_event(event));

    switch(event)
    {
        case UIPC_OPEN_EVT:

            /*  read directly from media task from here on (keep callback for
                connection events */
            UIPC_Ioctl(UIPC_CH_ID_AV_AUDIO, UIPC_REG_REMOVE_ACTIVE_READSET, NULL);
            UIPC_Ioctl(UIPC_CH_ID_AV_AUDIO, UIPC_SET_READ_POLL_TMO,
                       (void *)A2DP_DATA_READ_POLL_MS);

            if (btif_media_cb.peer_sep == AVDT_TSEP_SNK) {
                /* make sure we update any changed sbc encoder params */
                /*post a message to btif_av to serialize encode update and encode init*/
                btif_dispatch_sm_event(BTIF_AV_UPDATE_ENCODER_REQ_EVT, NULL, 0);
            }
            btif_media_cb.data_channel_open = TRUE;

            /* ack back when media task is fully started */
            break;

        case UIPC_CLOSE_EVT:
            a2dp_cmd_acknowledge(A2DP_CTRL_ACK_SUCCESS);
            btif_audiopath_detached();
            btif_media_cb.data_channel_open = FALSE;
            break;

        default :
            APPL_TRACE_ERROR("### A2DP-DATA EVENT %d NOT HANDLED ###", event);
            break;
    }
}


/*****************************************************************************
 **  BTIF ADAPTATION
 *****************************************************************************/

static UINT16 btif_media_task_get_sbc_rate(void)
{
    UINT16 rate = DEFAULT_SBC_BITRATE;

    /* restrict bitrate if a2dp link is non-edr */
    if (!btif_av_is_peer_edr())
    {
        rate = BTIF_A2DP_NON_EDR_MAX_RATE;
        APPL_TRACE_DEBUG("non-edr a2dp sink detected, restrict rate to %d", rate);
    }

    return rate;
}

static void btif_a2dp_encoder_init(void)
{
    UINT16 minmtu;
    tBTIF_MEDIA_INIT_AUDIO msg;
    tA2D_SBC_CIE sbc_config;

    /* lookup table for converting channel mode */
    UINT16 codec_mode_tbl[5] = { SBC_JOINT_STEREO, SBC_STEREO, SBC_DUAL, 0, SBC_MONO };

    /* lookup table for converting number of blocks */
    UINT16 codec_block_tbl[5] = { 16, 12, 8, 0, 4 };

    /* lookup table to convert freq */
    UINT16 freq_block_tbl[5] = { SBC_sf48000, SBC_sf44100, SBC_sf32000, 0, SBC_sf16000 };

    APPL_TRACE_DEBUG("btif_a2dp_encoder_init");

    /* Retrieve the current SBC configuration (default if currently not used) */
    bta_av_co_audio_get_sbc_config(&sbc_config, &minmtu);
    msg.NumOfSubBands = (sbc_config.num_subbands == A2D_SBC_IE_SUBBAND_4) ? 4 : 8;
    msg.NumOfBlocks = codec_block_tbl[sbc_config.block_len >> 5];
    msg.AllocationMethod = (sbc_config.alloc_mthd == A2D_SBC_IE_ALLOC_MD_L) ? SBC_LOUDNESS : SBC_SNR;
    msg.ChannelMode = codec_mode_tbl[sbc_config.ch_mode >> 1];
    msg.SamplingFreq = freq_block_tbl[sbc_config.samp_freq >> 5];
    msg.MtuSize = minmtu;

    APPL_TRACE_EVENT("msg.ChannelMode %x", msg.ChannelMode);

    /* Init the media task to encode SBC properly */
    btif_media_task_enc_init_req(&msg);
}

static void btif_a2dp_encoder_update(void)
{
    UINT16 minmtu;
    tA2D_SBC_CIE sbc_config;
    tBTIF_MEDIA_UPDATE_AUDIO msg;
    UINT8 pref_min;
    UINT8 pref_max;

    APPL_TRACE_DEBUG("btif_a2dp_encoder_update");

    /* Retrieve the current SBC configuration (default if currently not used) */
    bta_av_co_audio_get_sbc_config(&sbc_config, &minmtu);

    APPL_TRACE_DEBUG("btif_a2dp_encoder_update: Common min_bitpool:%d(0x%x) max_bitpool:%d(0x%x)",
            sbc_config.min_bitpool, sbc_config.min_bitpool,
            sbc_config.max_bitpool, sbc_config.max_bitpool);

    if (sbc_config.min_bitpool > sbc_config.max_bitpool)
    {
        APPL_TRACE_ERROR("btif_a2dp_encoder_update: ERROR btif_a2dp_encoder_update min_bitpool > max_bitpool");
    }

    /* check if remote sink has a preferred bitpool range */
    if (bta_av_co_get_remote_bitpool_pref(&pref_min, &pref_max) == TRUE)
    {
        /* adjust our preferred bitpool with the remote preference if within
           our capable range */

        if (pref_min < sbc_config.min_bitpool)
            pref_min = sbc_config.min_bitpool;

        if (pref_max > sbc_config.max_bitpool)
            pref_max = sbc_config.max_bitpool;

        msg.MinBitPool = pref_min;
        msg.MaxBitPool = pref_max;

        if ((pref_min != sbc_config.min_bitpool) || (pref_max != sbc_config.max_bitpool))
        {
            APPL_TRACE_EVENT("## adjusted our bitpool range to peer pref [%d:%d] ##",
                pref_min, pref_max);
        }
    }
    else
    {
        msg.MinBitPool = sbc_config.min_bitpool;
        msg.MaxBitPool = sbc_config.max_bitpool;
    }

    msg.MinMtuSize = minmtu;

    /* Update the media task to encode SBC properly */
    btif_media_task_enc_update_req(&msg);
}


/*****************************************************************************
**
** Function        btif_a2dp_start_media_task
**
** Description
**
** Returns
**
*******************************************************************************/

int btif_a2dp_start_media_task(void)
{
    int retval;

    if (media_task_running != MEDIA_TASK_STATE_OFF)
    {
        APPL_TRACE_ERROR("warning : media task already running");
        return GKI_FAILURE;
    }

    APPL_TRACE_EVENT("## A2DP START MEDIA TASK ##");

    /* start a2dp media task */
    retval = GKI_create_task((TASKPTR)btif_media_task, A2DP_MEDIA_TASK,
                A2DP_MEDIA_TASK_TASK_STR,
                (UINT16 *) ((UINT8 *)a2dp_media_task_stack + A2DP_MEDIA_TASK_STACK_SIZE),
                sizeof(a2dp_media_task_stack));

    if (retval != GKI_SUCCESS)
        return retval;

    /* wait for task to come up to sure we are able to send messages to it */
    while (media_task_running == MEDIA_TASK_STATE_OFF)
        TEMP_FAILURE_RETRY(usleep(10));

    APPL_TRACE_EVENT("## A2DP MEDIA TASK STARTED ##");

    return retval;
}

/*****************************************************************************
**
** Function        btif_a2dp_stop_media_task
**
** Description
**
** Returns
**
*******************************************************************************/

void btif_a2dp_stop_media_task(void)
{
    APPL_TRACE_EVENT("## A2DP STOP MEDIA TASK ##");
    GKI_destroy_task(BT_MEDIA_TASK);
}

/*****************************************************************************
**
** Function        btif_a2dp_on_init
**
** Description
**
** Returns
**
*******************************************************************************/

void btif_a2dp_on_init(void)
{
    //tput_mon(1, 0, 1);
}


/*****************************************************************************
**
** Function        btif_a2dp_setup_codec
**
** Description     does codec setup
**
** Returns        tBTIF_STATUS
**
*******************************************************************************/

tBTIF_STATUS btif_a2dp_setup_codec(void)
{
    tBTIF_AV_MEDIA_FEEDINGS media_feeding;
    tBTIF_STATUS status;

    APPL_TRACE_EVENT("## A2DP SETUP CODEC ##");

    GKI_disable();

    /* for now hardcode 44/48 khz 16 bit stereo */
#ifdef SAMPLE_RATE_48K
    media_feeding.cfg.pcm.sampling_freq = 48000;
#else
    media_feeding.cfg.pcm.sampling_freq = 44100;
#endif
    media_feeding.cfg.pcm.bit_per_sample = 16;
    media_feeding.cfg.pcm.num_channel = 2;
    media_feeding.format = BTIF_AV_CODEC_PCM;

    if (bta_av_co_audio_set_codec(&media_feeding, &status))
    {
        tBTIF_MEDIA_INIT_AUDIO_FEEDING mfeed;

        /* Init the encoding task */
        btif_a2dp_encoder_init();

        /* Build the media task configuration */
        mfeed.feeding = media_feeding;
        mfeed.feeding_mode = BTIF_AV_FEEDING_ASYNCHRONOUS;
        /* Send message to Media task to configure transcoding */
        btif_media_task_audio_feeding_init_req(&mfeed);
    }
    else
    {
        status = BTIF_ERROR_SRV_AV_FEEDING_NOT_SUPPORTED;
    }
    GKI_enable();
    return status;
}


/*****************************************************************************
**
** Function        btif_a2dp_update_codec
**
** Description
**
** Returns
**
*******************************************************************************/

void btif_a2dp_update_codec(void)
{
    APPL_TRACE_EVENT("## A2DP UPDATE CODEC ##");

    GKI_disable();
    /* Start the media task to encode SBC */
    btif_media_task_start_aa_req();
    btif_a2dp_encoder_update();
    GKI_enable();
}


/*****************************************************************************
**
** Function        btif_a2dp_on_idle
**
** Description
**
** Returns
**
*******************************************************************************/

void btif_a2dp_on_idle(void)
{
    APPL_TRACE_EVENT("## ON A2DP IDLE ##");
    if (btif_media_cb.peer_sep == AVDT_TSEP_SNK)
    {
        /* Make sure media task is stopped */
        btif_media_task_stop_aa_req();
    }

    bta_av_co_init();
#if (BTA_AV_SINK_INCLUDED == TRUE)
    if (btif_media_cb.peer_sep == AVDT_TSEP_SRC)
    {
        btif_media_cb.rx_flush = TRUE;
        btif_media_task_aa_rx_flush_req();
        btif_media_task_stop_decoding_req();
        btif_media_task_clear_track();
        APPL_TRACE_DEBUG("Stopped BT track");
#ifdef AVK_BACKPORT
        btif_media_cb.rx_audio_focus_gained = BTIF_MEDIA_AUDIOFOCUS_LOSS;
#endif
    }
#endif
}

/*****************************************************************************
**
** Function        btif_a2dp_on_open
**
** Description
**
** Returns
**
*******************************************************************************/

void btif_a2dp_on_open(void)
{
    APPL_TRACE_EVENT("## ON A2DP OPEN ##");

    /* always use callback to notify socket events */
    UIPC_Open(UIPC_CH_ID_AV_AUDIO, btif_a2dp_data_cb);
}

/*******************************************************************************
 **
 ** Function         btif_media_task_clear_track
 **
 ** Description
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
BOOLEAN btif_media_task_clear_track(void)
{
    BT_HDR *p_buf;

    if (NULL == (p_buf = GKI_getbuf(sizeof(BT_HDR))))
    {
        return FALSE;
    }

    p_buf->event = BTIF_MEDIA_AUDIO_SINK_CLEAR_TRACK;

    GKI_send_msg(BT_MEDIA_TASK, BTIF_MEDIA_TASK_CMD_MBOX, p_buf);
    return TRUE;
}
/*******************************************************************************
 **
 ** Function         btif_media_task_stop_decoding_req
 **
 ** Description
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
BOOLEAN btif_media_task_stop_decoding_req(void)
{
    BT_HDR *p_buf;

    if (!btif_media_cb.is_rx_timer)
        return TRUE;   /*  if timer is not running no need to send message */

    if (NULL == (p_buf = GKI_getbuf(sizeof(BT_HDR))))
    {
        return FALSE;
    }

    p_buf->event = BTIF_MEDIA_AUDIO_SINK_STOP_DECODING;

    GKI_send_msg(BT_MEDIA_TASK, BTIF_MEDIA_TASK_CMD_MBOX, p_buf);
    return TRUE;
}

/*******************************************************************************
 **
 ** Function         btif_media_task_start_decoding_req
 **
 ** Description
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
BOOLEAN btif_media_task_start_decoding_req(void)
{
    BT_HDR *p_buf;

    if(btif_media_cb.is_rx_timer)
        return FALSE;   /*  if timer is already running no need to send message */

    if (NULL == (p_buf = GKI_getbuf(sizeof(BT_HDR))))
    {
        return FALSE;
    }

    p_buf->event = BTIF_MEDIA_AUDIO_SINK_START_DECODING;

    GKI_send_msg(BT_MEDIA_TASK, BTIF_MEDIA_TASK_CMD_MBOX, p_buf);
    return TRUE;
}

/*****************************************************************************
**
** Function        btif_reset_decoder
**
** Description
**
** Returns
**
*******************************************************************************/

void btif_reset_decoder(UINT8 *p_av)
{
    APPL_TRACE_EVENT("btif_reset_decoder");
    APPL_TRACE_DEBUG("btif_reset_decoder p_codec_info[%x:%x:%x:%x:%x:%x]",
            p_av[1], p_av[2], p_av[3],
            p_av[4], p_av[5], p_av[6]);

    tBTIF_MEDIA_SINK_CFG_UPDATE *p_buf;
    if (NULL == (p_buf = GKI_getbuf(sizeof(tBTIF_MEDIA_SINK_CFG_UPDATE))))
    {
        APPL_TRACE_EVENT("btif_reset_decoder No Buffer ");
        return;
    }

    memcpy(p_buf->codec_info,p_av, AVDT_CODEC_SIZE);
    p_buf->hdr.event = BTIF_MEDIA_AUDIO_SINK_CFG_UPDATE;

    GKI_send_msg(BT_MEDIA_TASK, BTIF_MEDIA_TASK_CMD_MBOX, p_buf);
}

/*****************************************************************************
**
** Function        btif_a2dp_on_started
**
** Description
**
** Returns
**
*******************************************************************************/

BOOLEAN btif_a2dp_on_started(tBTA_AV_START *p_av, BOOLEAN pending_start)
{
    tBTIF_STATUS status;
    BOOLEAN ack = FALSE;

    APPL_TRACE_EVENT("## ON A2DP STARTED ##");
    med_task_perf_systrace_enabled();

    if (p_av == NULL)
    {
        /* ack back a local start request */
        a2dp_cmd_acknowledge(A2DP_CTRL_ACK_SUCCESS);
        return TRUE;
    }

    if (p_av->status == BTA_AV_SUCCESS)
    {
        if (p_av->suspending == FALSE)
        {
            if (p_av->initiator)
            {
                if (pending_start) {
                    a2dp_cmd_acknowledge(A2DP_CTRL_ACK_SUCCESS);
                    ack = TRUE;
                }
            }
            else
            {
                /* we were remotely started,  make sure codec
                   is setup before datapath is started */
                btif_a2dp_setup_codec();
            }

            /* media task is autostarted upon a2dp audiopath connection */
        }
    }
    else if (pending_start)
    {
        a2dp_cmd_acknowledge(A2DP_CTRL_ACK_FAILURE);
        ack = TRUE;
    }
    return ack;
}


/*****************************************************************************
**
** Function        btif_a2dp_ack_fail
**
** Description
**
** Returns
**
*******************************************************************************/

void btif_a2dp_ack_fail(void)
{
    tBTIF_STATUS status;

    APPL_TRACE_EVENT("## A2DP_CTRL_ACK_FAILURE ##");
    a2dp_cmd_acknowledge(A2DP_CTRL_ACK_FAILURE);
}

/*****************************************************************************
**
** Function        btif_a2dp_on_stopped
**
** Description
**
** Returns
**
*******************************************************************************/

void btif_a2dp_on_stopped(tBTA_AV_SUSPEND *p_av)
{
    APPL_TRACE_EVENT("## ON A2DP STOPPED ##");
    if (btif_media_cb.peer_sep == AVDT_TSEP_SRC) /*  Handling for A2DP SINK cases*/
    {
        btif_media_cb.rx_flush = TRUE;
        btif_media_task_aa_rx_flush_req();
        btif_media_task_stop_decoding_req();
        UIPC_Close(UIPC_CH_ID_AV_AUDIO);
        btif_media_cb.data_channel_open = FALSE;
        return;
    }
    /* allow using this api for other than suspend */
    if (p_av != NULL)
    {
        if (p_av->status != BTA_AV_SUCCESS)
        {
            APPL_TRACE_EVENT("AV STOP FAILED (%d)", p_av->status);

            if (p_av->initiator)
                a2dp_cmd_acknowledge(A2DP_CTRL_ACK_FAILURE);
            return;
        }
    }

    /* ensure tx frames are immediately suspended */
    btif_media_cb.tx_flush = 1;

    /* request to stop media task  */
    btif_media_task_aa_tx_flush_req();
    btif_media_task_stop_aa_req();

    /* once stream is fully stopped we will ack back */
}


/*****************************************************************************
**
** Function        btif_a2dp_on_suspended
**
** Description
**
** Returns
**
*******************************************************************************/

void btif_a2dp_on_suspended(tBTA_AV_SUSPEND *p_av)
{
    APPL_TRACE_EVENT("## ON A2DP SUSPENDED ##");
    if (btif_media_cb.peer_sep == AVDT_TSEP_SRC)
    {
        btif_media_cb.rx_flush = TRUE;
        btif_media_task_aa_rx_flush_req();
        btif_media_task_stop_decoding_req();
        return;
    }

    /* check for status failures */
    if (p_av->status != BTA_AV_SUCCESS)
    {
        if (p_av->initiator == TRUE)
            a2dp_cmd_acknowledge(A2DP_CTRL_ACK_FAILURE);
    }

    /* once stream is fully stopped we will ack back */

    /* ensure tx frames are immediately flushed */
    btif_media_cb.tx_flush = 1;

    /* stop timer tick */
    btif_media_task_stop_aa_req();
}

/* when true media task discards any rx frames */
void btif_a2dp_set_rx_flush(BOOLEAN enable)
{
    APPL_TRACE_EVENT("## DROP RX %d ##", enable);
    btif_media_cb.rx_flush = enable;
}

/* when true media task discards any tx frames */
void btif_a2dp_set_tx_flush(BOOLEAN enable)
{
    APPL_TRACE_EVENT("## DROP TX %d ##", enable);
    btif_media_cb.tx_flush = enable;
}

#if (BTA_AV_SINK_INCLUDED == TRUE)
#ifdef AVK_BACKPORT
void btif_a2dp_set_audio_focus_state(btif_media_AudioFocus_state state)
{
    btif_media_cb.rx_audio_focus_gained = state;
    if (btif_media_cb.rx_audio_focus_gained ==  BTIF_MEDIA_AUDIOFOCUS_LOSS)
    {
        btif_a2dp_set_rx_flush(TRUE);
    }
    if (btif_media_cb.rx_audio_focus_gained ==  BTIF_MEDIA_AUDIOFOCUS_GAIN)
    {
        btif_a2dp_set_rx_flush(FALSE);
    }
}
#endif
/*******************************************************************************
 **
 ** Function         btif_media_task_avk_handle_timer
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_avk_handle_timer ( void )
{
    UINT8 count;
    tBT_SBC_HDR *p_msg;
    int num_sbc_frames;
    int num_frames_to_process;

    count = btif_media_cb.RxSbcQ.count;
    if (0 == count)
    {
        APPL_TRACE_DEBUG("  QUE  EMPTY ");
    }
    else
    {
        if (btif_media_cb.rx_flush == TRUE)
        {
            btif_media_flush_q(&(btif_media_cb.RxSbcQ));
            return;
        }

        if (btif_media_cb.RxSbcQ.count > 3)
            num_frames_to_process =  2 * btif_media_cb.frames_to_process;
        else
            num_frames_to_process = btif_media_cb.frames_to_process;

        APPL_TRACE_DEBUG(" Process Frames + ");

        do
        {
            p_msg = (tBT_SBC_HDR *)GKI_getfirst(&(btif_media_cb.RxSbcQ));
            if (p_msg == NULL)
                return;
            num_sbc_frames  = p_msg->num_frames_to_be_processed; /* num of frames in Que Packets */
            APPL_TRACE_DEBUG(" Frames left in topmost packet %d", num_sbc_frames);
            APPL_TRACE_DEBUG(" Remaining frames to process in tick %d", num_frames_to_process);
            APPL_TRACE_DEBUG(" Num of Packets in Que %d", btif_media_cb.RxSbcQ.count);

            if ( num_sbc_frames > num_frames_to_process) /*  Que Packet has more frames*/
            {
                 p_msg->num_frames_to_be_processed= num_frames_to_process;
                 btif_media_task_handle_inc_media(p_msg);
                 p_msg->num_frames_to_be_processed = num_sbc_frames - num_frames_to_process;
                 num_frames_to_process = 0;
                 break;
            }
            else                                        /*  Que packet has less frames */
            {
                btif_media_task_handle_inc_media(p_msg);
                p_msg = (tBT_SBC_HDR *)GKI_dequeue(&(btif_media_cb.RxSbcQ));
                if( p_msg == NULL )
                {
                     APPL_TRACE_ERROR("Insufficient data in que ");
                     break;
                }
                num_frames_to_process = num_frames_to_process - p_msg->num_frames_to_be_processed;
                GKI_freebuf(p_msg);
            }
        }while(num_frames_to_process > 0);

        APPL_TRACE_DEBUG(" Process Frames - ");
    }
}
#endif

/*******************************************************************************
 **
 ** Function         btif_media_task_aa_handle_timer
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/

static void btif_media_task_aa_handle_timer(void)
{
#if (defined(DEBUG_MEDIA_AV_FLOW) && (DEBUG_MEDIA_AV_FLOW == TRUE))
    static UINT16 Debug = 0;
    APPL_TRACE_DEBUG("btif_media_task_aa_handle_timer: %d", Debug++);
#endif

    log_tstamps_us("media task tx timer");

#if (BTA_AV_INCLUDED == TRUE)
    if(btif_media_cb.is_tx_timer == TRUE)
    {
        btif_media_send_aa_frame();
    }
    else
    {
        APPL_TRACE_ERROR("ERROR Media task Scheduled after Suspend");
    }
#endif
}

#if (BTA_AV_INCLUDED == TRUE)
/*******************************************************************************
 **
 ** Function         btif_media_task_aa_handle_timer
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_aa_handle_uipc_rx_rdy(void)
{
#if (defined(DEBUG_MEDIA_AV_FLOW) && (DEBUG_MEDIA_AV_FLOW == TRUE))
    static UINT16 Debug = 0;
    APPL_TRACE_DEBUG("btif_media_task_aa_handle_uipc_rx_rdy: %d", Debug++);
#endif

    /* process all the UIPC data */
    btif_media_aa_prep_2_send(0xFF);

    /* send it */
    VERBOSE("btif_media_task_aa_handle_uipc_rx_rdy calls bta_av_ci_src_data_ready");
    bta_av_ci_src_data_ready(BTA_AV_CHNL_AUDIO);
}
#endif

/*******************************************************************************
 **
 ** Function         btif_media_task_init
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/

void btif_media_task_init(void)
{
    memset(&(btif_media_cb), 0, sizeof(btif_media_cb));

    UIPC_Init(NULL);

#if (BTA_AV_INCLUDED == TRUE)
    UIPC_Open(UIPC_CH_ID_AV_CTRL , btif_a2dp_ctrl_cb);
#endif
}
/*******************************************************************************
 **
 ** Function         btif_media_task
 **
 ** Description      Task for SBC encoder.  This task receives an
 **                  event when the waveIn interface has a pcm data buffer
 **                  ready.  On receiving the event, handle all ready pcm
 **                  data buffers.  If stream is started, run the SBC encoder
 **                  on each chunk of pcm samples and build an output packet
 **                  consisting of one or more encoded SBC frames.
 **
 ** Returns          void
 **
 *******************************************************************************/
int btif_media_task(void *p)
{
    UINT16 event;
    BT_HDR *p_msg;
    UNUSED(p);

    VERBOSE("================ MEDIA TASK STARTING ================");

    btif_media_task_init();

    media_task_running = MEDIA_TASK_STATE_ON;

    raise_priority_a2dp(TASK_HIGH_MEDIA);

    while (1)
    {
        event = GKI_wait(0xffff, 0);

        VERBOSE("================= MEDIA TASK EVENT %d ===============", event);

        if (event & BTIF_MEDIA_TASK_CMD)
        {
            /* Process all messages in the queue */
            while ((p_msg = (BT_HDR *) GKI_read_mbox(BTIF_MEDIA_TASK_CMD_MBOX)) != NULL)
            {
                btif_media_task_handle_cmd(p_msg);
            }
        }

        if (event & BTIF_MEDIA_TASK_DATA)
        {
            VERBOSE("================= Received Media Packets %d ===============", event);
            /* Process all messages in the queue */
            while ((p_msg = (BT_HDR *) GKI_read_mbox(BTIF_MEDIA_TASK_DATA_MBOX)) != NULL)
            {
                btif_media_task_handle_media(p_msg);
            }
        }

        if (event & BTIF_MEDIA_AA_TASK_TIMER)
        {
            /* advance audio timer expiration */
            btif_media_task_aa_handle_timer();
        }

        if (event & BTIF_MEDIA_AVK_TASK_TIMER)
        {
#if (BTA_AV_SINK_INCLUDED == TRUE)
            /* advance audio timer expiration for a2dp sink */
            btif_media_task_avk_handle_timer();
#endif
        }



        VERBOSE("=============== MEDIA TASK EVENT %d DONE ============", event);

        /* When we get this event we exit the task  - should only happen on GKI_shutdown  */
        if (event & BTIF_MEDIA_TASK_KILL)
        {
            /* make sure no channels are restarted while shutting down */
            media_task_running = MEDIA_TASK_STATE_SHUTTING_DOWN;

            /* this calls blocks until uipc is fully closed */
            UIPC_Close(UIPC_CH_ID_ALL);
            break;
        }
    }

    /* Clear media task flag */
    media_task_running = MEDIA_TASK_STATE_OFF;

    APPL_TRACE_DEBUG("MEDIA TASK EXITING");

    return 0;
}


/*******************************************************************************
 **
 ** Function         btif_media_task_send_cmd_evt
 **
 ** Description
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
BOOLEAN btif_media_task_send_cmd_evt(UINT16 Evt)
{
    BT_HDR *p_buf;
    if (NULL == (p_buf = GKI_getbuf(sizeof(BT_HDR))))
    {
        return FALSE;
    }

    p_buf->event = Evt;

    GKI_send_msg(BT_MEDIA_TASK, BTIF_MEDIA_TASK_CMD_MBOX, p_buf);
    return TRUE;
}

/*******************************************************************************
 **
 ** Function         btif_media_flush_q
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_flush_q(BUFFER_Q *p_q)
{
    while (!GKI_queue_is_empty(p_q))
    {
        GKI_freebuf(GKI_dequeue(p_q));
    }
}


/*******************************************************************************
 **
 ** Function         btif_media_task_handle_cmd
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_handle_cmd(BT_HDR *p_msg)
{
    VERBOSE("btif_media_task_handle_cmd : %d %s", p_msg->event,
             dump_media_event(p_msg->event));

    switch (p_msg->event)
    {
#if (BTA_AV_INCLUDED == TRUE)
    case BTIF_MEDIA_START_AA_TX:
        btif_media_task_aa_start_tx();
        break;
    case BTIF_MEDIA_STOP_AA_TX:
        btif_media_task_aa_stop_tx();
        break;
    case BTIF_MEDIA_SBC_ENC_INIT:
        btif_media_task_enc_init(p_msg);
        break;
    case BTIF_MEDIA_SBC_ENC_UPDATE:
        btif_media_task_enc_update(p_msg);
        break;
    case BTIF_MEDIA_AUDIO_FEEDING_INIT:
        btif_media_task_audio_feeding_init(p_msg);
        break;
    case BTIF_MEDIA_FLUSH_AA_TX:
        btif_media_task_aa_tx_flush(p_msg);
        break;
    case BTIF_MEDIA_UIPC_RX_RDY:
        btif_media_task_aa_handle_uipc_rx_rdy();
        break;
    case BTIF_MEDIA_AUDIO_SINK_CFG_UPDATE:
#if (BTA_AV_SINK_INCLUDED == TRUE)
        btif_media_task_aa_handle_decoder_reset(p_msg);
#endif
        break;
    case BTIF_MEDIA_AUDIO_SINK_START_DECODING:
        btif_media_task_aa_handle_start_decoding();
        break;
    case BTIF_MEDIA_AUDIO_SINK_CLEAR_TRACK:
#if (BTA_AV_SINK_INCLUDED == TRUE)
        btif_media_task_aa_handle_clear_track();
#endif
        break;
    case BTIF_MEDIA_AUDIO_SINK_STOP_DECODING:
        btif_media_task_aa_handle_stop_decoding();
        break;
     case BTIF_MEDIA_FLUSH_AA_RX:
        btif_media_task_aa_rx_flush();
        break;
#endif
    default:
        APPL_TRACE_ERROR("ERROR in btif_media_task_handle_cmd unknown event %d", p_msg->event);
    }
    GKI_freebuf(p_msg);
    VERBOSE("btif_media_task_handle_cmd : %s DONE", dump_media_event(p_msg->event));
}

#if (BTA_AV_SINK_INCLUDED == TRUE)
/*******************************************************************************
 **
 ** Function         btif_media_task_handle_inc_media
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_handle_inc_media(tBT_SBC_HDR*p_msg)
{
    UINT8 *sbc_start_frame = ((UINT8*)(p_msg + 1) + p_msg->offset + 1);
    int count;
    UINT32 pcmBytes, availPcmBytes;
    OI_INT16 *pcmDataPointer = pcmData; /*Will be overwritten on next packet receipt*/
    OI_STATUS status;
    int num_sbc_frames = p_msg->num_frames_to_be_processed;
    UINT32 sbc_frame_len = p_msg->len - 1;
#ifdef AVK_BACKPORT
    int retwriteAudioTrack = 0;
#endif
    availPcmBytes = 2*sizeof(pcmData);

    if ((btif_media_cb.peer_sep == AVDT_TSEP_SNK) || (btif_media_cb.rx_flush))
    {
        APPL_TRACE_DEBUG(" State Changed happened in this tick ");
        return;
    }

#ifndef AVK_BACKPORT
    // ignore data if no one is listening
    if (!btif_media_cb.data_channel_open)
        return;
#endif

    APPL_TRACE_DEBUG("Number of sbc frames %d, frame_len %d", num_sbc_frames, sbc_frame_len);

    for(count = 0; count < num_sbc_frames && sbc_frame_len != 0; count ++)
    {
        pcmBytes = availPcmBytes;
        status = OI_CODEC_SBC_DecodeFrame(&context, (const OI_BYTE**)&sbc_start_frame,
                                                        (OI_UINT32 *)&sbc_frame_len,
                                                        (OI_INT16 *)pcmDataPointer,
                                                        (OI_UINT32 *)&pcmBytes);
        if (!OI_SUCCESS(status)) {
            APPL_TRACE_ERROR("Decoding failure: %d\n", status);
            break;
        }
        availPcmBytes -= pcmBytes;
        pcmDataPointer += pcmBytes/2;
        p_msg->offset += (p_msg->len - 1) - sbc_frame_len;
        p_msg->len = sbc_frame_len + 1;
    }
#ifdef AVK_BACKPORT
    retwriteAudioTrack = btWriteData((void*)pcmData, (2*sizeof(pcmData) - availPcmBytes));
    APPL_TRACE_LATENCY_AUDIO("Written to audio, seq number %d", p_msg->layer_specific);
#else
    UIPC_Send(UIPC_CH_ID_AV_AUDIO, 0, (UINT8 *)pcmData, (2*sizeof(pcmData) - availPcmBytes));
#endif
}
#endif

/*******************************************************************************
 **
 ** Function         btif_media_task_handle_media
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_handle_media(BT_HDR*p_msg)
{
    APPL_TRACE_DEBUG(" btif_media_task_handle_media ");
    GKI_freebuf(p_msg);
}
#if (BTA_AV_INCLUDED == TRUE)
/*******************************************************************************
 **
 ** Function         btif_media_task_enc_init_req
 **
 ** Description
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
BOOLEAN btif_media_task_enc_init_req(tBTIF_MEDIA_INIT_AUDIO *p_msg)
{
    tBTIF_MEDIA_INIT_AUDIO *p_buf;
    if (NULL == (p_buf = GKI_getbuf(sizeof(tBTIF_MEDIA_INIT_AUDIO))))
    {
        return FALSE;
    }

    memcpy(p_buf, p_msg, sizeof(tBTIF_MEDIA_INIT_AUDIO));
    p_buf->hdr.event = BTIF_MEDIA_SBC_ENC_INIT;

    GKI_send_msg(BT_MEDIA_TASK, BTIF_MEDIA_TASK_CMD_MBOX, p_buf);
    return TRUE;
}

/*******************************************************************************
 **
 ** Function         btif_media_task_enc_update_req
 **
 ** Description
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
BOOLEAN btif_media_task_enc_update_req(tBTIF_MEDIA_UPDATE_AUDIO *p_msg)
{
    tBTIF_MEDIA_UPDATE_AUDIO *p_buf;
    if (NULL == (p_buf = GKI_getbuf(sizeof(tBTIF_MEDIA_UPDATE_AUDIO))))
    {
        return FALSE;
    }

    memcpy(p_buf, p_msg, sizeof(tBTIF_MEDIA_UPDATE_AUDIO));
    p_buf->hdr.event = BTIF_MEDIA_SBC_ENC_UPDATE;

    GKI_send_msg(BT_MEDIA_TASK, BTIF_MEDIA_TASK_CMD_MBOX, p_buf);
    return TRUE;
}

/*******************************************************************************
 **
 ** Function         btif_media_task_audio_feeding_init_req
 **
 ** Description
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
BOOLEAN btif_media_task_audio_feeding_init_req(tBTIF_MEDIA_INIT_AUDIO_FEEDING *p_msg)
{
    tBTIF_MEDIA_INIT_AUDIO_FEEDING *p_buf;
    if (NULL == (p_buf = GKI_getbuf(sizeof(tBTIF_MEDIA_INIT_AUDIO_FEEDING))))
    {
        return FALSE;
    }

    memcpy(p_buf, p_msg, sizeof(tBTIF_MEDIA_INIT_AUDIO_FEEDING));
    p_buf->hdr.event = BTIF_MEDIA_AUDIO_FEEDING_INIT;

    GKI_send_msg(BT_MEDIA_TASK, BTIF_MEDIA_TASK_CMD_MBOX, p_buf);
    return TRUE;
}

/*******************************************************************************
 **
 ** Function         btif_media_task_start_aa_req
 **
 ** Description
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
BOOLEAN btif_media_task_start_aa_req(void)
{
    BT_HDR *p_buf;
    if (NULL == (p_buf = GKI_getbuf(sizeof(BT_HDR))))
    {
        APPL_TRACE_EVENT("GKI failed");
        return FALSE;
    }

    p_buf->event = BTIF_MEDIA_START_AA_TX;

    GKI_send_msg(BT_MEDIA_TASK, BTIF_MEDIA_TASK_CMD_MBOX, p_buf);
    return TRUE;
}

/*******************************************************************************
 **
 ** Function         btif_media_task_stop_aa_req
 **
 ** Description
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
BOOLEAN btif_media_task_stop_aa_req(void)
{
    BT_HDR *p_buf;
    if (NULL == (p_buf = GKI_getbuf(sizeof(BT_HDR))))
    {
        return FALSE;
    }

    p_buf->event = BTIF_MEDIA_STOP_AA_TX;

    GKI_send_msg(BT_MEDIA_TASK, BTIF_MEDIA_TASK_CMD_MBOX, p_buf);
    return TRUE;
}
/*******************************************************************************
 **
 ** Function         btif_media_task_aa_rx_flush_req
 **
 ** Description
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
BOOLEAN btif_media_task_aa_rx_flush_req(void)
{
    BT_HDR *p_buf;

    if (GKI_queue_is_empty(&(btif_media_cb.RxSbcQ))== TRUE) /*  Que is already empty */
        return TRUE;

    if (NULL == (p_buf = GKI_getbuf(sizeof(BT_HDR))))
    {
        return FALSE;
    }

    p_buf->event = BTIF_MEDIA_FLUSH_AA_RX;

    GKI_send_msg(BT_MEDIA_TASK, BTIF_MEDIA_TASK_CMD_MBOX, p_buf);
    return TRUE;
}

/*******************************************************************************
 **
 ** Function         btif_media_task_aa_tx_flush_req
 **
 ** Description
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
BOOLEAN btif_media_task_aa_tx_flush_req(void)
{
    BT_HDR *p_buf;
    if (NULL == (p_buf = GKI_getbuf(sizeof(BT_HDR))))
    {
        return FALSE;
    }

    p_buf->event = BTIF_MEDIA_FLUSH_AA_TX;

    GKI_send_msg(BT_MEDIA_TASK, BTIF_MEDIA_TASK_CMD_MBOX, p_buf);
    return TRUE;
}
/*******************************************************************************
 **
 ** Function         btif_media_task_aa_rx_flush
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_aa_rx_flush(void)
{
    /* Flush all enqueued GKI SBC  buffers (encoded) */
    APPL_TRACE_DEBUG("btif_media_task_aa_rx_flush");

    btif_media_flush_q(&(btif_media_cb.RxSbcQ));
}


/*******************************************************************************
 **
 ** Function         btif_media_task_aa_tx_flush
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_aa_tx_flush(BT_HDR *p_msg)
{
    UNUSED(p_msg);

    /* Flush all enqueued GKI music buffers (encoded) */
    APPL_TRACE_DEBUG("btif_media_task_aa_tx_flush");

    btif_media_cb.media_feeding_state.pcm.counter = 0;
    btif_media_cb.media_feeding_state.pcm.aa_feed_residue = 0;

    btif_media_flush_q(&(btif_media_cb.TxAaQ));

    UIPC_Ioctl(UIPC_CH_ID_AV_AUDIO, UIPC_REQ_RX_FLUSH, NULL);
}

/*******************************************************************************
 **
 ** Function       btif_media_task_enc_init
 **
 ** Description    Initialize encoding task
 **
 ** Returns        void
 **
 *******************************************************************************/
static void btif_media_task_enc_init(BT_HDR *p_msg)
{
    tBTIF_MEDIA_INIT_AUDIO *pInitAudio = (tBTIF_MEDIA_INIT_AUDIO *) p_msg;

    APPL_TRACE_DEBUG("btif_media_task_enc_init");

    btif_media_cb.timestamp = 0;

    /* SBC encoder config (enforced even if not used) */
    btif_media_cb.encoder.s16ChannelMode = pInitAudio->ChannelMode;
    btif_media_cb.encoder.s16NumOfSubBands = pInitAudio->NumOfSubBands;
    btif_media_cb.encoder.s16NumOfBlocks = pInitAudio->NumOfBlocks;
    btif_media_cb.encoder.s16AllocationMethod = pInitAudio->AllocationMethod;
    btif_media_cb.encoder.s16SamplingFreq = pInitAudio->SamplingFreq;

    btif_media_cb.encoder.u16BitRate = btif_media_task_get_sbc_rate();

    /* Default transcoding is PCM to SBC, modified by feeding configuration */
    btif_media_cb.TxTranscoding = BTIF_MEDIA_TRSCD_PCM_2_SBC;
    btif_media_cb.TxAaMtuSize = ((BTIF_MEDIA_AA_BUF_SIZE-BTIF_MEDIA_AA_SBC_OFFSET-sizeof(BT_HDR))
            < pInitAudio->MtuSize) ? (BTIF_MEDIA_AA_BUF_SIZE - BTIF_MEDIA_AA_SBC_OFFSET
            - sizeof(BT_HDR)) : pInitAudio->MtuSize;

    APPL_TRACE_EVENT("btif_media_task_enc_init busy %d, mtu %d, peer mtu %d",
                     btif_media_cb.busy_level, btif_media_cb.TxAaMtuSize, pInitAudio->MtuSize);
    APPL_TRACE_EVENT("      ch mode %d, subnd %d, nb blk %d, alloc %d, rate %d, freq %d",
            btif_media_cb.encoder.s16ChannelMode, btif_media_cb.encoder.s16NumOfSubBands,
            btif_media_cb.encoder.s16NumOfBlocks,
            btif_media_cb.encoder.s16AllocationMethod, btif_media_cb.encoder.u16BitRate,
            btif_media_cb.encoder.s16SamplingFreq);

    /* Reset entirely the SBC encoder */
    SBC_Encoder_Init(&(btif_media_cb.encoder));

    btif_media_cb.TxNumSBCFrames = check_for_max_number_of_frames_per_packet();
    APPL_TRACE_DEBUG("btif_media_task_enc_init bit pool %d", btif_media_cb.encoder.s16BitPool);
}

/*******************************************************************************
 **
 ** Function       btif_media_task_enc_update
 **
 ** Description    Update encoding task
 **
 ** Returns        void
 **
 *******************************************************************************/

static void btif_media_task_enc_update(BT_HDR *p_msg)
{
    tBTIF_MEDIA_UPDATE_AUDIO * pUpdateAudio = (tBTIF_MEDIA_UPDATE_AUDIO *) p_msg;
    SBC_ENC_PARAMS *pstrEncParams = &btif_media_cb.encoder;
    UINT16 s16SamplingFreq;
    SINT16 s16BitPool = 0;
    SINT16 s16BitRate;
    SINT16 s16FrameLen;
    UINT8 protect = 0;

    APPL_TRACE_DEBUG("btif_media_task_enc_update : minmtu %d, maxbp %d minbp %d",
            pUpdateAudio->MinMtuSize, pUpdateAudio->MaxBitPool, pUpdateAudio->MinBitPool);

    if (!pstrEncParams->s16NumOfSubBands)
    {
        APPL_TRACE_ERROR("Error: SubBands are set to 0, resetting to Max");
        pstrEncParams->s16NumOfSubBands = SBC_MAX_NUM_OF_SUBBANDS;
    }
    if (!pstrEncParams->s16NumOfBlocks)
    {
        APPL_TRACE_ERROR("Error: Blocks are set to 0, resetting to Max");
        pstrEncParams->s16NumOfBlocks = SBC_MAX_NUM_OF_BLOCKS;
    }
    if (!pstrEncParams->s16NumOfChannels)
    {
        APPL_TRACE_ERROR("Error: Channels are set to 0, resetting to Max");
        pstrEncParams->s16NumOfChannels = SBC_MAX_NUM_OF_CHANNELS;
    }

    /* Only update the bitrate and MTU size while timer is running to make sure it has been initialized */
    //if (btif_media_cb.is_tx_timer)
    {
        btif_media_cb.TxAaMtuSize = ((BTIF_MEDIA_AA_BUF_SIZE -
                                      BTIF_MEDIA_AA_SBC_OFFSET - sizeof(BT_HDR))
                < pUpdateAudio->MinMtuSize) ? (BTIF_MEDIA_AA_BUF_SIZE - BTIF_MEDIA_AA_SBC_OFFSET
                - sizeof(BT_HDR)) : pUpdateAudio->MinMtuSize;
        /* Set the initial target bit rate */
        pstrEncParams->u16BitRate = btif_media_task_get_sbc_rate();

        if (pstrEncParams->s16SamplingFreq == SBC_sf16000)
            s16SamplingFreq = 16000;
        else if (pstrEncParams->s16SamplingFreq == SBC_sf32000)
            s16SamplingFreq = 32000;
        else if (pstrEncParams->s16SamplingFreq == SBC_sf44100)
            s16SamplingFreq = 44100;
        else
            s16SamplingFreq = 48000;

        do
        {
            if (pstrEncParams->s16NumOfBlocks == 0 || pstrEncParams->s16NumOfSubBands == 0
                || pstrEncParams->s16NumOfChannels == 0)
            {
                APPL_TRACE_ERROR("btif_media_task_enc_update() - Avoiding division by zero...");
                APPL_TRACE_ERROR("btif_media_task_enc_update() - block=%d, subBands=%d, channels=%d",
                    pstrEncParams->s16NumOfBlocks, pstrEncParams->s16NumOfSubBands,
                    pstrEncParams->s16NumOfChannels);
                break;
            }

            if ((pstrEncParams->s16ChannelMode == SBC_JOINT_STEREO) ||
                (pstrEncParams->s16ChannelMode == SBC_STEREO) )
            {
                s16BitPool = (SINT16)( (pstrEncParams->u16BitRate *
                    pstrEncParams->s16NumOfSubBands * 1000 / s16SamplingFreq)
                    -( (32 + (4 * pstrEncParams->s16NumOfSubBands *
                    pstrEncParams->s16NumOfChannels)
                    + ( (pstrEncParams->s16ChannelMode - 2) *
                    pstrEncParams->s16NumOfSubBands )   )
                    / pstrEncParams->s16NumOfBlocks) );

                s16FrameLen = 4 + (4*pstrEncParams->s16NumOfSubBands*
                    pstrEncParams->s16NumOfChannels)/8
                    + ( ((pstrEncParams->s16ChannelMode - 2) *
                    pstrEncParams->s16NumOfSubBands)
                    + (pstrEncParams->s16NumOfBlocks * s16BitPool) ) / 8;

                s16BitRate = (8 * s16FrameLen * s16SamplingFreq)
                    / (pstrEncParams->s16NumOfSubBands *
                    pstrEncParams->s16NumOfBlocks * 1000);

                if (s16BitRate > pstrEncParams->u16BitRate)
                    s16BitPool--;

                if(pstrEncParams->s16NumOfSubBands == 8)
                    s16BitPool = (s16BitPool > 255) ? 255 : s16BitPool;
                else
                    s16BitPool = (s16BitPool > 128) ? 128 : s16BitPool;
            }
            else
            {
                s16BitPool = (SINT16)( ((pstrEncParams->s16NumOfSubBands *
                    pstrEncParams->u16BitRate * 1000)
                    / (s16SamplingFreq * pstrEncParams->s16NumOfChannels))
                    -( ( (32 / pstrEncParams->s16NumOfChannels) +
                    (4 * pstrEncParams->s16NumOfSubBands) )
                    /   pstrEncParams->s16NumOfBlocks ) );

                pstrEncParams->s16BitPool = (s16BitPool >
                    (16 * pstrEncParams->s16NumOfSubBands))
                    ? (16*pstrEncParams->s16NumOfSubBands) : s16BitPool;
            }

            if (s16BitPool < 0)
            {
                s16BitPool = 0;
            }

            APPL_TRACE_EVENT("bitpool candidate : %d (%d kbps)",
                         s16BitPool, pstrEncParams->u16BitRate);

            if (s16BitPool > pUpdateAudio->MaxBitPool)
            {
                APPL_TRACE_DEBUG("btif_media_task_enc_update computed bitpool too large (%d)",
                                    s16BitPool);
                /* Decrease bitrate */
                btif_media_cb.encoder.u16BitRate -= BTIF_MEDIA_BITRATE_STEP;
                /* Record that we have decreased the bitrate */
                protect |= 1;
            }
            else if (s16BitPool < pUpdateAudio->MinBitPool)
            {
                APPL_TRACE_WARNING("btif_media_task_enc_update computed bitpool too small (%d)", s16BitPool);

                /* Increase bitrate */
                UINT16 previous_u16BitRate = btif_media_cb.encoder.u16BitRate;
                btif_media_cb.encoder.u16BitRate += BTIF_MEDIA_BITRATE_STEP;
                /* Record that we have increased the bitrate */
                protect |= 2;
                /* Check over-flow */
                if (btif_media_cb.encoder.u16BitRate < previous_u16BitRate)
                    protect |= 3;
            }
            else
            {
                break;
            }
            /* In case we have already increased and decreased the bitrate, just stop */
            if (protect == 3)
            {
                APPL_TRACE_ERROR("btif_media_task_enc_update could not find bitpool in range");
                break;
            }
        } while (1);

        /* Finally update the bitpool in the encoder structure */
        pstrEncParams->s16BitPool = s16BitPool;

        APPL_TRACE_DEBUG("btif_media_task_enc_update final bit rate %d, final bit pool %d",
                btif_media_cb.encoder.u16BitRate, btif_media_cb.encoder.s16BitPool);

        /* make sure we reinitialize encoder with new settings */
        SBC_Encoder_Init(&(btif_media_cb.encoder));
        btif_media_cb.TxNumSBCFrames = check_for_max_number_of_frames_per_packet();
    }
}

/*******************************************************************************
 **
 ** Function         btif_media_task_pcm2sbc_init
 **
 ** Description      Init encoding task for PCM to SBC according to feeding
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_pcm2sbc_init(tBTIF_MEDIA_INIT_AUDIO_FEEDING * p_feeding)
{
    BOOLEAN reconfig_needed = FALSE;

    APPL_TRACE_DEBUG("PCM feeding:");
    APPL_TRACE_DEBUG("sampling_freq:%d", p_feeding->feeding.cfg.pcm.sampling_freq);
    APPL_TRACE_DEBUG("num_channel:%d", p_feeding->feeding.cfg.pcm.num_channel);
    APPL_TRACE_DEBUG("bit_per_sample:%d", p_feeding->feeding.cfg.pcm.bit_per_sample);

    /* Check the PCM feeding sampling_freq */
    switch (p_feeding->feeding.cfg.pcm.sampling_freq)
    {
        case  8000:
        case 12000:
        case 16000:
        case 24000:
        case 32000:
        case 48000:
            /* For these sampling_freq the AV connection must be 48000 */
            if (btif_media_cb.encoder.s16SamplingFreq != SBC_sf48000)
            {
                /* Reconfiguration needed at 48000 */
                APPL_TRACE_DEBUG("SBC Reconfiguration needed at 48000");
                btif_media_cb.encoder.s16SamplingFreq = SBC_sf48000;
                reconfig_needed = TRUE;
            }
            break;

        case 11025:
        case 22050:
        case 44100:
            /* For these sampling_freq the AV connection must be 44100 */
            if (btif_media_cb.encoder.s16SamplingFreq != SBC_sf44100)
            {
                /* Reconfiguration needed at 44100 */
                APPL_TRACE_DEBUG("SBC Reconfiguration needed at 44100");
                btif_media_cb.encoder.s16SamplingFreq = SBC_sf44100;
                reconfig_needed = TRUE;
            }
            break;
        default:
            APPL_TRACE_DEBUG("Feeding PCM sampling_freq unsupported");
            break;
    }

    /* Some AV Headsets do not support Mono => always ask for Stereo */
    if (btif_media_cb.encoder.s16ChannelMode == SBC_MONO)
    {
        APPL_TRACE_DEBUG("SBC Reconfiguration needed in Stereo");
        btif_media_cb.encoder.s16ChannelMode = SBC_JOINT_STEREO;
        reconfig_needed = TRUE;
    }

    if (reconfig_needed != FALSE)
    {
        APPL_TRACE_DEBUG("btif_media_task_pcm2sbc_init :: mtu %d", btif_media_cb.TxAaMtuSize);
        APPL_TRACE_DEBUG("ch mode %d, nbsubd %d, nb %d, alloc %d, rate %d, freq %d",
                btif_media_cb.encoder.s16ChannelMode,
                btif_media_cb.encoder.s16NumOfSubBands, btif_media_cb.encoder.s16NumOfBlocks,
                btif_media_cb.encoder.s16AllocationMethod, btif_media_cb.encoder.u16BitRate,
                btif_media_cb.encoder.s16SamplingFreq);

        SBC_Encoder_Init(&(btif_media_cb.encoder));
    }
    else
    {
        APPL_TRACE_DEBUG("btif_media_task_pcm2sbc_init no SBC reconfig needed");
    }
}


/*******************************************************************************
 **
 ** Function         btif_media_task_audio_feeding_init
 **
 ** Description      Initialize the audio path according to the feeding format
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_audio_feeding_init(BT_HDR *p_msg)
{
    tBTIF_MEDIA_INIT_AUDIO_FEEDING *p_feeding = (tBTIF_MEDIA_INIT_AUDIO_FEEDING *) p_msg;

    APPL_TRACE_DEBUG("btif_media_task_audio_feeding_init format:%d", p_feeding->feeding.format);

    /* Save Media Feeding information */
    btif_media_cb.feeding_mode = p_feeding->feeding_mode;
    btif_media_cb.media_feeding = p_feeding->feeding;

    /* Handle different feeding formats */
    switch (p_feeding->feeding.format)
    {
        case BTIF_AV_CODEC_PCM:
            btif_media_cb.TxTranscoding = BTIF_MEDIA_TRSCD_PCM_2_SBC;
            btif_media_task_pcm2sbc_init(p_feeding);
            break;

        default :
            APPL_TRACE_ERROR("unknown feeding format %d", p_feeding->feeding.format);
            break;
    }
}

int btif_a2dp_get_track_frequency(UINT8 frequency) {
    int freq = 48000;
    switch (frequency) {
        case A2D_SBC_IE_SAMP_FREQ_16:
            freq = 16000;
            break;
        case A2D_SBC_IE_SAMP_FREQ_32:
            freq = 32000;
            break;
        case A2D_SBC_IE_SAMP_FREQ_44:
            freq = 44100;
            break;
        case A2D_SBC_IE_SAMP_FREQ_48:
            freq = 48000;
            break;
    }
    return freq;
}

int btif_a2dp_get_track_channel_count(UINT8 channeltype) {
    int count = 1;
    switch (channeltype) {
        case A2D_SBC_IE_CH_MD_MONO:
            count = 1;
            break;
        case A2D_SBC_IE_CH_MD_DUAL:
        case A2D_SBC_IE_CH_MD_STEREO:
        case A2D_SBC_IE_CH_MD_JOINT:
            count = 2;
            break;
    }
    return count;
}

#ifdef AVK_BACKPORT
int a2dp_get_track_channel_type(UINT8 channeltype) {
    int count = 1;
    switch (channeltype) {
        case A2D_SBC_IE_CH_MD_MONO:
            count = 1;
            break;
        case A2D_SBC_IE_CH_MD_DUAL:
        case A2D_SBC_IE_CH_MD_STEREO:
        case A2D_SBC_IE_CH_MD_JOINT:
            count = 3;
            break;
    }
    return count;
}
#endif

void btif_a2dp_set_peer_sep(UINT8 sep) {
    btif_media_cb.peer_sep = sep;
}

/*******************************************************************************
 **
 ** Function         btif_media_task_aa_handle_stop_decoding
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_aa_handle_stop_decoding(void )
{
    btif_media_cb.is_rx_timer = FALSE;
    GKI_stop_timer(BTIF_MEDIA_AVK_TASK_TIMER_ID);
#ifdef AVK_BACKPORT
    btPauseTrack();
#endif

}

/*******************************************************************************
 **
 ** Function         btif_media_task_aa_handle_start_decoding
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_aa_handle_start_decoding(void )
{
    if(btif_media_cb.is_rx_timer == TRUE)
        return;
#ifdef AVK_BACKPORT
    btStartTrack();
#endif
    btif_media_cb.is_rx_timer = TRUE;
    GKI_start_timer(BTIF_MEDIA_AVK_TASK_TIMER_ID, GKI_MS_TO_TICKS(BTIF_SINK_MEDIA_TIME_TICK), TRUE);
}

#if (BTA_AV_SINK_INCLUDED == TRUE)

static void btif_media_task_aa_handle_clear_track (void)
{
    APPL_TRACE_DEBUG("btif_media_task_aa_handle_clear_track");
#ifdef AVK_BACKPORT
    btStopTrack();
    btDeleteTrack();
#endif
}

/*******************************************************************************
 **
 ** Function         btif_media_task_aa_handle_decoder_reset
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_aa_handle_decoder_reset(BT_HDR *p_msg)
{
    tBTIF_MEDIA_SINK_CFG_UPDATE *p_buf = (tBTIF_MEDIA_SINK_CFG_UPDATE*) p_msg;
    tA2D_STATUS a2d_status;
    tA2D_SBC_CIE sbc_cie;
    OI_STATUS       status;
    UINT32          freq_multiple = 48*20; /* frequency multiple for 20ms of data , initialize with 48K*/
    UINT32          num_blocks = 16;
    UINT32          num_subbands = 8;

    APPL_TRACE_DEBUG("btif_media_task_aa_handle_decoder_reset p_codec_info[%x:%x:%x:%x:%x:%x]",
            p_buf->codec_info[1], p_buf->codec_info[2], p_buf->codec_info[3],
            p_buf->codec_info[4], p_buf->codec_info[5], p_buf->codec_info[6]);

    a2d_status = A2D_ParsSbcInfo(&sbc_cie, p_buf->codec_info, FALSE);
    if (a2d_status != A2D_SUCCESS)
    {
        APPL_TRACE_ERROR("ERROR dump_codec_info A2D_ParsSbcInfo fail:%d", a2d_status);
        return;
    }

    btif_media_cb.sample_rate = btif_a2dp_get_track_frequency(sbc_cie.samp_freq);
    btif_media_cb.channel_count = btif_a2dp_get_track_channel_count(sbc_cie.ch_mode);

#ifndef AVK_BACKPORT
    btif_media_cb.rx_flush = FALSE;
#endif

    APPL_TRACE_DEBUG("Reset to sink role");
    status = OI_CODEC_SBC_DecoderReset(&context, contextData, sizeof(contextData), 2, 2, FALSE);
    if (!OI_SUCCESS(status)) {
        APPL_TRACE_ERROR("OI_CODEC_SBC_DecoderReset failed with error code %d\n", status);
    }
#ifdef AVK_BACKPORT
    APPL_TRACE_DEBUG("A2dpSink: Crate Track");
    if (btCreateTrack(btif_a2dp_get_track_frequency(sbc_cie.samp_freq), a2dp_get_track_channel_type(sbc_cie.ch_mode)) == -1) {
        APPL_TRACE_ERROR("A2dpSink: Track creation fails!!!");
        return;
    }
#else
    UIPC_Open(UIPC_CH_ID_AV_AUDIO, btif_a2dp_data_cb);
#endif

    switch(sbc_cie.samp_freq)
    {
        case A2D_SBC_IE_SAMP_FREQ_16:
            APPL_TRACE_DEBUG("\tsamp_freq:%d (16000)", sbc_cie.samp_freq);
            freq_multiple = 16*20;
            break;
        case A2D_SBC_IE_SAMP_FREQ_32:
            APPL_TRACE_DEBUG("\tsamp_freq:%d (32000)", sbc_cie.samp_freq);
            freq_multiple = 32*20;
            break;
        case A2D_SBC_IE_SAMP_FREQ_44:
            APPL_TRACE_DEBUG("\tsamp_freq:%d (44100)", sbc_cie.samp_freq);
            freq_multiple = 441*2;
            break;
        case A2D_SBC_IE_SAMP_FREQ_48:
            APPL_TRACE_DEBUG("\tsamp_freq:%d (48000)", sbc_cie.samp_freq);
            freq_multiple = 48*20;
            break;
        default:
            APPL_TRACE_DEBUG(" Unknown Frequency ");
            break;
    }

    switch(sbc_cie.ch_mode)
    {
        case A2D_SBC_IE_CH_MD_MONO:
            APPL_TRACE_DEBUG("\tch_mode:%d (Mono)", sbc_cie.ch_mode);
            break;
        case A2D_SBC_IE_CH_MD_DUAL:
            APPL_TRACE_DEBUG("\tch_mode:%d (DUAL)", sbc_cie.ch_mode);
            break;
        case A2D_SBC_IE_CH_MD_STEREO:
            APPL_TRACE_DEBUG("\tch_mode:%d (STEREO)", sbc_cie.ch_mode);
            break;
        case A2D_SBC_IE_CH_MD_JOINT:
            APPL_TRACE_DEBUG("\tch_mode:%d (JOINT)", sbc_cie.ch_mode);
            break;
        default:
            APPL_TRACE_DEBUG(" Unknown Mode ");
            break;
    }

    switch(sbc_cie.block_len)
    {
        case A2D_SBC_IE_BLOCKS_4:
            APPL_TRACE_DEBUG("\tblock_len:%d (4)", sbc_cie.block_len);
            num_blocks = 4;
            break;
        case A2D_SBC_IE_BLOCKS_8:
            APPL_TRACE_DEBUG("\tblock_len:%d (8)", sbc_cie.block_len);
            num_blocks = 8;
            break;
        case A2D_SBC_IE_BLOCKS_12:
            APPL_TRACE_DEBUG("\tblock_len:%d (12)", sbc_cie.block_len);
            num_blocks = 12;
            break;
        case A2D_SBC_IE_BLOCKS_16:
            APPL_TRACE_DEBUG("\tblock_len:%d (16)", sbc_cie.block_len);
            num_blocks = 16;
            break;
        default:
            APPL_TRACE_DEBUG(" Unknown BlockLen ");
            break;
    }

    switch(sbc_cie.num_subbands)
    {
        case A2D_SBC_IE_SUBBAND_4:
            APPL_TRACE_DEBUG("\tnum_subbands:%d (4)", sbc_cie.num_subbands);
            num_subbands = 4;
            break;
        case A2D_SBC_IE_SUBBAND_8:
            APPL_TRACE_DEBUG("\tnum_subbands:%d (8)", sbc_cie.num_subbands);
            num_subbands = 8;
            break;
        default:
            APPL_TRACE_DEBUG(" Unknown SubBands ");
            break;
    }

    switch(sbc_cie.alloc_mthd)
    {
        case A2D_SBC_IE_ALLOC_MD_S:
            APPL_TRACE_DEBUG("\talloc_mthd:%d (SNR)", sbc_cie.alloc_mthd);
            break;
        case A2D_SBC_IE_ALLOC_MD_L:
            APPL_TRACE_DEBUG("\talloc_mthd:%d (Loudness)", sbc_cie.alloc_mthd);
            break;
        default:
            APPL_TRACE_DEBUG(" Unknown Allocation Method");
            break;
    }

    APPL_TRACE_DEBUG("\tBit pool Min:%d Max:%d", sbc_cie.min_bitpool, sbc_cie.max_bitpool);

    btif_media_cb.frames_to_process = ((freq_multiple)/(num_blocks*num_subbands)) + 1;
    APPL_TRACE_DEBUG(" Frames to be processed in 20 ms %d",btif_media_cb.frames_to_process);
}
#endif

/*******************************************************************************
 **
 ** Function         btif_media_task_feeding_state_reset
 **
 ** Description      Reset the media feeding state
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_feeding_state_reset(void)
{
    /* By default, just clear the entire state */
    memset(&btif_media_cb.media_feeding_state, 0, sizeof(btif_media_cb.media_feeding_state));

    if (btif_media_cb.TxTranscoding == BTIF_MEDIA_TRSCD_PCM_2_SBC)
    {
        btif_media_cb.media_feeding_state.pcm.bytes_per_tick =
                (btif_media_cb.media_feeding.cfg.pcm.sampling_freq *
                 btif_media_cb.media_feeding.cfg.pcm.bit_per_sample / 8 *
                 btif_media_cb.media_feeding.cfg.pcm.num_channel *
                 BTIF_MEDIA_TIME_TICK)/1000;

        APPL_TRACE_WARNING("pcm bytes per tick %d",
                            (int)btif_media_cb.media_feeding_state.pcm.bytes_per_tick);
    }
}
/*******************************************************************************
 **
 ** Function         btif_media_task_aa_start_tx
 **
 ** Description      Start media task encoding
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_aa_start_tx(void)
{
    APPL_TRACE_DEBUG("btif_media_task_aa_start_tx is timer %d, feeding mode %d",
             btif_media_cb.is_tx_timer, btif_media_cb.feeding_mode);

    /* Use a timer to poll the UIPC, get rid of the UIPC call back */
    // UIPC_Ioctl(UIPC_CH_ID_AV_AUDIO, UIPC_REG_CBACK, NULL);

    btif_media_cb.is_tx_timer = TRUE;
    last_frame_us = 0;

    /* Reset the media feeding state */
    btif_media_task_feeding_state_reset();

    APPL_TRACE_EVENT("starting timer %d ticks (%d)",
                  GKI_MS_TO_TICKS(BTIF_MEDIA_TIME_TICK), TICKS_PER_SEC);

    GKI_start_timer(BTIF_MEDIA_AA_TASK_TIMER_ID, GKI_MS_TO_TICKS(BTIF_MEDIA_TIME_TICK), TRUE);
}

/*******************************************************************************
 **
 ** Function         btif_media_task_aa_stop_tx
 **
 ** Description      Stop media task encoding
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_task_aa_stop_tx(void)
{
    BOOLEAN  is_data_path = FALSE;
    APPL_TRACE_DEBUG("btif_media_task_aa_stop_tx is timer: %d", btif_media_cb.is_tx_timer);

    /* Stop the timer first */
    GKI_stop_timer(BTIF_MEDIA_AA_TASK_TIMER_ID);
    if (btif_media_cb.is_tx_timer)
    {
        btif_media_cb.is_tx_timer = FALSE;
        is_data_path  = TRUE ;
    }
    UIPC_Close(UIPC_CH_ID_AV_AUDIO);
    /* Try to send acknowldegment once the media stream is
       stopped. This will make sure that the A2dp HAL layer is
       unblocked on wait for acknowledgment for the sent command.
       This resolves corner cases of AVDTP SUSPEND collision
       when DUT and Remote device issues SUSPEND simultaneously
       and due to processing of the SUSPEND request of remote,
       the media path is teared down. If A2dp HAL happens to wait
       for ACK for initiated SUSPEND, would never receive it casuing
       a block/wait. Due to this acknowledgement, A2dp HAL is guranteed
       to get ACK for any pending command in such cases. */

    if (!is_data_path)
        a2dp_cmd_acknowledge(A2DP_CTRL_ACK_SUCCESS);

    /* audio engine stopped, reset tx suspended flag */
    btif_media_cb.tx_flush = 0;
    last_frame_us = 0;

    /* Reset the media feeding state */
    btif_media_task_feeding_state_reset();
}

static UINT32 get_frame_length()
{
    UINT32 frame_len = 0;
    APPL_TRACE_DEBUG("channel mode: %d, sub-band: %d, number of block: %d, \
            bitpool: %d, sampling frequency: %d, num channels: %d",
            btif_media_cb.encoder.s16ChannelMode,
            btif_media_cb.encoder.s16NumOfSubBands,
            btif_media_cb.encoder.s16NumOfBlocks,
            btif_media_cb.encoder.s16BitPool,
            btif_media_cb.encoder.s16SamplingFreq,
            btif_media_cb.encoder.s16NumOfChannels);

    switch(btif_media_cb.encoder.s16ChannelMode)
    {
        case SBC_MONO:
        case SBC_DUAL:
            frame_len = 4 + ((UINT32)(4 * btif_media_cb.encoder.s16NumOfSubBands *
                btif_media_cb.encoder.s16NumOfChannels) / 8) +
                ((UINT32)(btif_media_cb.encoder.s16NumOfBlocks *
                btif_media_cb.encoder.s16NumOfChannels *
                btif_media_cb.encoder.s16BitPool) / 8);
            break;
        case SBC_STEREO:
            frame_len = 4 + ((UINT32)(4 * btif_media_cb.encoder.s16NumOfSubBands *
                btif_media_cb.encoder.s16NumOfChannels) / 8) +
                ((UINT32)(btif_media_cb.encoder.s16NumOfBlocks *
                btif_media_cb.encoder.s16BitPool) / 8);
            break;
        case SBC_JOINT_STEREO:
            frame_len = 4 + ((UINT32)(4 * btif_media_cb.encoder.s16NumOfSubBands *
                btif_media_cb.encoder.s16NumOfChannels) / 8) +
                ((UINT32)(btif_media_cb.encoder.s16NumOfSubBands +
                (btif_media_cb.encoder.s16NumOfBlocks *
                btif_media_cb.encoder.s16BitPool)) / 8);
            break;
        default:
            APPL_TRACE_DEBUG("Invalid channel number");
    }
    APPL_TRACE_DEBUG("calculated frame length: %d", frame_len);
    return frame_len;
}

static UINT8 check_for_max_number_of_frames_per_packet()
{
    UINT16 result = 0;
    UINT16 effective_mtu_size = btif_media_cb.TxAaMtuSize;
    UINT32 frame_len;

    APPL_TRACE_DEBUG("original AVDTP MTU size: %d", btif_media_cb.TxAaMtuSize);
    if (btif_av_is_peer_edr() && (btif_av_peer_supports_3mbps() == FALSE)) {
        // This condition would be satisfied only if remote is EDR and supports only 2mbps
        // but effective AVDTP MTU size exceeds 2dh5 packet size
        APPL_TRACE_DEBUG("Headset is edr but does not support 3mbps");
        if (effective_mtu_size > MAX_2MBPS_AVDTP_MTU)
        {
            APPL_TRACE_DEBUG("restricting AVDTP MTU size to 675");
            effective_mtu_size = MAX_2MBPS_AVDTP_MTU;
            btif_media_cb.TxAaMtuSize = effective_mtu_size;
        }
    }

    if (!btif_media_cb.encoder.s16NumOfSubBands)
    {
        APPL_TRACE_ERROR("Error: SubBands are set to 0, resetting to Max");
        btif_media_cb.encoder.s16NumOfSubBands = SBC_MAX_NUM_OF_SUBBANDS;
    }
    if (!btif_media_cb.encoder.s16NumOfBlocks)
    {
        APPL_TRACE_ERROR("Error: Blocks are set to 0, resetting to Max");
        btif_media_cb.encoder.s16NumOfBlocks = SBC_MAX_NUM_OF_BLOCKS;
    }
    if (!btif_media_cb.encoder.s16NumOfChannels)
    {
        APPL_TRACE_ERROR("Error: Channels are set to 0, resetting to Max");
        btif_media_cb.encoder.s16NumOfChannels = SBC_MAX_NUM_OF_CHANNELS;
    }
    frame_len = get_frame_length();

    APPL_TRACE_DEBUG("effective Tx MTU to be considered: %d",
                                            effective_mtu_size);
    switch(btif_media_cb.encoder.s16SamplingFreq)
    {
        case SBC_sf44100:
            if(!frame_len)
            {
                APPL_TRACE_ERROR("Error: Calculating frame length, \
                                            resetting it to default");
                frame_len = MAX_SBC_HQ_FRAME_SIZE_44_1;
            }
            result = (effective_mtu_size - A2DP_HDR_SIZE) / frame_len;
            APPL_TRACE_DEBUG("max number of sbc frames: %d", result);
            break;

        case SBC_sf48000:
            if(!frame_len)
            {
                APPL_TRACE_ERROR("Error: Calculating frame length, \
                                            resetting it to default");
                frame_len = MAX_SBC_HQ_FRAME_SIZE_48;
            }
            result = (effective_mtu_size - A2DP_HDR_SIZE) / frame_len;
            APPL_TRACE_DEBUG("max number of sbc frames: %d", result);
            break;

        default:
            APPL_TRACE_ERROR("Error: max number of sbc frames: %d", result);

    }
    return result;
}

static inline UINT64 now_us_rounded_to_nearest_tick(void)
{
    UINT32 tick_us = BTIF_MEDIA_TIME_TICK * 1000;
    return (GKI_now_us() + tick_us/2) / tick_us * tick_us;
}

/*******************************************************************************
 **
 ** Function         btif_get_num_aa_frame
 **
 ** Description
 **
 ** Returns          The number of media frames in this time slice.  When a
 **                  partial time slice has occurred, we round to the nearest
 **                  total number of time slices.  This avoids all rounding errors
 **                  that could occur in computing the amount of data that should
 **                  be sent.
 **
 *******************************************************************************/
static UINT8 btif_get_num_aa_frame(void)
{
    UINT8 result=0;

    switch (btif_media_cb.TxTranscoding)
    {
        case BTIF_MEDIA_TRSCD_PCM_2_SBC:
        {
            UINT32 pcm_bytes_per_frame = compute_pcm_bytes_per_frame();
            UINT32 us_this_tick = BTIF_MEDIA_TIME_TICK * 1000;
            UINT64 now_us = now_us_rounded_to_nearest_tick();
            if (last_frame_us != 0)
                us_this_tick = (now_us - last_frame_us);
            last_frame_us = now_us;

            btif_media_cb.media_feeding_state.pcm.counter +=
                                btif_media_cb.media_feeding_state.pcm.bytes_per_tick *
                                us_this_tick / (BTIF_MEDIA_TIME_TICK * 1000);

            /* calculate nbr of frames pending for this media tick */
            result = btif_media_cb.media_feeding_state.pcm.counter/pcm_bytes_per_frame;
            if (result > MAX_PCM_FRAME_NUM_PER_TICK)
            {
                APPL_TRACE_WARNING("%s() - Limiting frames to be sent from %d to %d"
                    , __FUNCTION__, result, MAX_PCM_FRAME_NUM_PER_TICK);
                result = MAX_PCM_FRAME_NUM_PER_TICK;
            }
            btif_media_cb.media_feeding_state.pcm.counter -= result*pcm_bytes_per_frame;

            VERBOSE("WRITE %d FRAMES", result);
        }
        break;

        default:
            APPL_TRACE_ERROR("ERROR btif_get_num_aa_frame Unsupported transcoding format 0x%x",
                    btif_media_cb.TxTranscoding);
            result = 0;
            break;
    }

#if (defined(DEBUG_MEDIA_AV_FLOW) && (DEBUG_MEDIA_AV_FLOW == TRUE))
    APPL_TRACE_DEBUG("btif_get_num_aa_frame returns %d", result);
#endif

    return (UINT8)result;
}

/*******************************************************************************
 **
 ** Function         btif_media_sink_enque_buf
 **
 ** Description      This function is called by the av_co to fill A2DP Sink Queue
 **
 **
 ** Returns          size of the queue
 *******************************************************************************/
UINT8 btif_media_sink_enque_buf(BT_HDR *p_pkt)
{
    tBT_SBC_HDR *p_msg;

    if(btif_media_cb.rx_flush == TRUE) /* Flush enabled, do not enque*/
        return btif_media_cb.RxSbcQ.count;
    if(btif_media_cb.RxSbcQ.count == MAX_SINK_A2DP_FRAME_QUEUE_SZ)
    {
        GKI_freebuf(GKI_dequeue(&(btif_media_cb.RxSbcQ)));
    }

    BTIF_TRACE_VERBOSE("btif_media_sink_enque_buf + ");
    /* allocate and Queue this buffer */
    if ((p_msg = (tBT_SBC_HDR *) GKI_getbuf(sizeof(tBT_SBC_HDR) +
                        p_pkt->offset+ p_pkt->len)) != NULL)
    {
        memcpy(p_msg, p_pkt, (sizeof(BT_HDR) + p_pkt->offset + p_pkt->len));
        p_msg->num_frames_to_be_processed = (*((UINT8*)(p_msg + 1) + p_msg->offset)) & 0x0f;
        BTIF_TRACE_VERBOSE("btif_media_sink_enque_buf + ", p_msg->num_frames_to_be_processed);
        GKI_enqueue(&(btif_media_cb.RxSbcQ), p_msg);
        if(btif_media_cb.RxSbcQ.count == MAX_A2DP_DELAYED_START_FRAME_COUNT)
        {
            BTIF_TRACE_DEBUG(" Initiate Decoding ");
            btif_media_task_start_decoding_req();
        }
    }
    else
    {
        /* let caller deal with a failed allocation */
        BTIF_TRACE_VERBOSE("btif_media_sink_enque_buf No Buffer left - ");
    }
    return btif_media_cb.RxSbcQ.count;
}

/*******************************************************************************
 **
 ** Function         btif_media_aa_readbuf
 **
 ** Description      This function is called by the av_co to get the next buffer to send
 **
 **
 ** Returns          void
 *******************************************************************************/
BT_HDR *btif_media_aa_readbuf(void)
{
    return GKI_dequeue(&(btif_media_cb.TxAaQ));
}

/*******************************************************************************
 **
 ** Function         btif_media_aa_read_feeding
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/

BOOLEAN btif_media_aa_read_feeding(tUIPC_CH_ID channel_id)
{
    UINT16 event;
    UINT16 blocm_x_subband = btif_media_cb.encoder.s16NumOfSubBands * \
                             btif_media_cb.encoder.s16NumOfBlocks;
    UINT32 read_size;
    UINT16 sbc_sampling = 48000;
    UINT32 src_samples;
    UINT16 bytes_needed = blocm_x_subband * btif_media_cb.encoder.s16NumOfChannels * \
                          btif_media_cb.media_feeding.cfg.pcm.bit_per_sample / 8;
    static UINT16 up_sampled_buffer[SBC_MAX_NUM_FRAME * SBC_MAX_NUM_OF_BLOCKS
            * SBC_MAX_NUM_OF_CHANNELS * SBC_MAX_NUM_OF_SUBBANDS * 2];
    static UINT16 read_buffer[SBC_MAX_NUM_FRAME * SBC_MAX_NUM_OF_BLOCKS
            * SBC_MAX_NUM_OF_CHANNELS * SBC_MAX_NUM_OF_SUBBANDS];
    UINT32 src_size_used;
    UINT32 dst_size_used;
    BOOLEAN fract_needed;
    INT32   fract_max;
    INT32   fract_threshold;
    UINT32  nb_byte_read;

    /* Get the SBC sampling rate */
    switch (btif_media_cb.encoder.s16SamplingFreq)
    {
    case SBC_sf48000:
        sbc_sampling = 48000;
        break;
    case SBC_sf44100:
        sbc_sampling = 44100;
        break;
    case SBC_sf32000:
        sbc_sampling = 32000;
        break;
    case SBC_sf16000:
        sbc_sampling = 16000;
        break;
    }

    if (sbc_sampling == btif_media_cb.media_feeding.cfg.pcm.sampling_freq) {
        read_size = bytes_needed - btif_media_cb.media_feeding_state.pcm.aa_feed_residue;
        nb_byte_read = UIPC_Read(channel_id, &event,
                  ((UINT8 *)btif_media_cb.encoder.as16PcmBuffer) +
                  btif_media_cb.media_feeding_state.pcm.aa_feed_residue,
                  read_size);
        if (nb_byte_read == read_size) {
            btif_media_cb.media_feeding_state.pcm.aa_feed_residue = 0;
            return TRUE;
        } else {
            APPL_TRACE_WARNING("### UNDERFLOW :: ONLY READ %d BYTES OUT OF %d ###",
                nb_byte_read, read_size);
            btif_media_cb.media_feeding_state.pcm.aa_feed_residue += nb_byte_read;
            return FALSE;
        }
    }

    /* Some Feeding PCM frequencies require to split the number of sample */
    /* to read. */
    /* E.g 128/6=21.3333 => read 22 and 21 and 21 => max = 2; threshold = 0*/
    fract_needed = FALSE;   /* Default */
    switch (btif_media_cb.media_feeding.cfg.pcm.sampling_freq)
    {
    case 32000:
    case 8000:
        fract_needed = TRUE;
        fract_max = 2;          /* 0, 1 and 2 */
        fract_threshold = 0;    /* Add one for the first */
        break;
    case 16000:
        fract_needed = TRUE;
        fract_max = 2;          /* 0, 1 and 2 */
        fract_threshold = 1;    /* Add one for the first two frames*/
        break;
    }

    /* Compute number of sample to read from source */
    src_samples = blocm_x_subband;
    src_samples *= btif_media_cb.media_feeding.cfg.pcm.sampling_freq;
    src_samples /= sbc_sampling;

    /* The previous division may have a remainder not null */
    if (fract_needed)
    {
        if (btif_media_cb.media_feeding_state.pcm.aa_feed_counter <= fract_threshold)
        {
            src_samples++; /* for every read before threshold add one sample */
        }

        /* do nothing if counter >= threshold */
        btif_media_cb.media_feeding_state.pcm.aa_feed_counter++; /* one more read */
        if (btif_media_cb.media_feeding_state.pcm.aa_feed_counter > fract_max)
        {
            btif_media_cb.media_feeding_state.pcm.aa_feed_counter = 0;
        }
    }

    /* Compute number of bytes to read from source */
    read_size = src_samples;
    read_size *= btif_media_cb.media_feeding.cfg.pcm.num_channel;
    read_size *= (btif_media_cb.media_feeding.cfg.pcm.bit_per_sample / 8);

    /* Read Data from UIPC channel */
    nb_byte_read = UIPC_Read(channel_id, &event, (UINT8 *)read_buffer, read_size);

    //tput_mon(TRUE, nb_byte_read, FALSE);

    if (nb_byte_read < read_size)
    {
        APPL_TRACE_WARNING("### UNDERRUN :: ONLY READ %d BYTES OUT OF %d ###",
                nb_byte_read, read_size);

        if (bt_systrace_log_enabled)
        {
            char trace_buf[512];
            snprintf(trace_buf, 32, "A2DP UNDERRUN read %d ", nb_byte_read);
            ATRACE_BEGIN(trace_buf);
        }

        if (bt_systrace_log_enabled)
        {
            ATRACE_END();
        }

        if (nb_byte_read == 0)
            return FALSE;

        if(btif_media_cb.feeding_mode == BTIF_AV_FEEDING_ASYNCHRONOUS)
        {
            /* Fill the unfilled part of the read buffer with silence (0) */
            memset(((UINT8 *)read_buffer) + nb_byte_read, 0, read_size - nb_byte_read);
            nb_byte_read = read_size;
        }
    }

    /* Initialize PCM up-sampling engine */
    bta_av_sbc_init_up_sample(btif_media_cb.media_feeding.cfg.pcm.sampling_freq,
            sbc_sampling, btif_media_cb.media_feeding.cfg.pcm.bit_per_sample,
            btif_media_cb.media_feeding.cfg.pcm.num_channel);

    /* re-sample read buffer */
    /* The output PCM buffer will be stereo, 16 bit per sample */
    dst_size_used = bta_av_sbc_up_sample((UINT8 *)read_buffer,
            (UINT8 *)up_sampled_buffer + btif_media_cb.media_feeding_state.pcm.aa_feed_residue,
            nb_byte_read,
            sizeof(up_sampled_buffer) - btif_media_cb.media_feeding_state.pcm.aa_feed_residue,
            &src_size_used);

#if (defined(DEBUG_MEDIA_AV_FLOW) && (DEBUG_MEDIA_AV_FLOW == TRUE))
    APPL_TRACE_DEBUG("btif_media_aa_read_feeding readsz:%d src_size_used:%d dst_size_used:%d",
            read_size, src_size_used, dst_size_used);
#endif

    /* update the residue */
    btif_media_cb.media_feeding_state.pcm.aa_feed_residue += dst_size_used;

    /* only copy the pcm sample when we have up-sampled enough PCM */
    if(btif_media_cb.media_feeding_state.pcm.aa_feed_residue >= bytes_needed)
    {
        /* Copy the output pcm samples in SBC encoding buffer */
        memcpy((UINT8 *)btif_media_cb.encoder.as16PcmBuffer,
                (UINT8 *)up_sampled_buffer,
                bytes_needed);
        /* update the residue */
        btif_media_cb.media_feeding_state.pcm.aa_feed_residue -= bytes_needed;

        if (btif_media_cb.media_feeding_state.pcm.aa_feed_residue != 0)
        {
            memcpy((UINT8 *)up_sampled_buffer,
                   (UINT8 *)up_sampled_buffer + bytes_needed,
                   btif_media_cb.media_feeding_state.pcm.aa_feed_residue);
        }
        return TRUE;
    }

#if (defined(DEBUG_MEDIA_AV_FLOW) && (DEBUG_MEDIA_AV_FLOW == TRUE))
    APPL_TRACE_DEBUG("btif_media_aa_read_feeding residue:%d, dst_size_used %d, bytes_needed %d",
            btif_media_cb.media_feeding_state.pcm.aa_feed_residue, dst_size_used, bytes_needed);
#endif

    return FALSE;
}

/*******************************************************************************
 **
 ** Function         btif_media_aa_prep_sbc_2_send
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_aa_prep_sbc_2_send(UINT8 nb_frame)
{
    BT_HDR * p_buf;
    UINT16 blocm_x_subband = btif_media_cb.encoder.s16NumOfSubBands *
                             btif_media_cb.encoder.s16NumOfBlocks;

#if (defined(DEBUG_MEDIA_AV_FLOW) && (DEBUG_MEDIA_AV_FLOW == TRUE))
    APPL_TRACE_DEBUG("btif_media_aa_prep_sbc_2_send nb_frame %d, TxAaQ %d",
                       nb_frame, btif_media_cb.TxAaQ.count);
#endif
    while (nb_frame)
    {
        if (NULL == (p_buf = GKI_getpoolbuf(BTIF_MEDIA_AA_POOL_ID)))
        {
            APPL_TRACE_ERROR ("ERROR btif_media_aa_prep_sbc_2_send no buffer TxCnt %d ",
                                btif_media_cb.TxAaQ.count);
            return;
        }

        /* Init buffer */
        p_buf->offset = BTIF_MEDIA_AA_SBC_OFFSET;
        p_buf->len = 0;
        p_buf->layer_specific = 0;

        do
        {
            /* Write @ of allocated buffer in encoder.pu8Packet */
            btif_media_cb.encoder.pu8Packet = (UINT8 *) (p_buf + 1) + p_buf->offset + p_buf->len;
            /* Fill allocated buffer with 0 */
            memset(btif_media_cb.encoder.as16PcmBuffer, 0, blocm_x_subband
                    * btif_media_cb.encoder.s16NumOfChannels);

            /* Read PCM data and upsample them if needed */
            if (btif_media_aa_read_feeding(UIPC_CH_ID_AV_AUDIO))
            {
                /* SBC encode and descramble frame */
                SBC_Encoder(&(btif_media_cb.encoder));
                A2D_SbcChkFrInit(btif_media_cb.encoder.pu8Packet);
                A2D_SbcDescramble(btif_media_cb.encoder.pu8Packet, btif_media_cb.encoder.u16PacketLength);
                /* Update SBC frame length */
                p_buf->len += btif_media_cb.encoder.u16PacketLength;
                nb_frame--;
                p_buf->layer_specific++;
            }
            else
            {
                APPL_TRACE_WARNING("btif_media_aa_prep_sbc_2_send underflow %d, %d",
                    nb_frame, btif_media_cb.media_feeding_state.pcm.aa_feed_residue);
                btif_media_cb.media_feeding_state.pcm.counter += nb_frame *
                     btif_media_cb.encoder.s16NumOfSubBands *
                     btif_media_cb.encoder.s16NumOfBlocks *
                     btif_media_cb.media_feeding.cfg.pcm.num_channel *
                     btif_media_cb.media_feeding.cfg.pcm.bit_per_sample / 8;
                /* no more pcm to read */
                nb_frame = 0;

                /* break read loop if timer was stopped (media task stopped) */
                if ( btif_media_cb.is_tx_timer == FALSE )
                {
                    GKI_freebuf(p_buf);
                    return;
                }
            }

        } while (((p_buf->len + btif_media_cb.encoder.u16PacketLength) < btif_media_cb.TxAaMtuSize)
                && (p_buf->layer_specific < 0x0F) && nb_frame);

        if(p_buf->len)
        {
            /* timestamp of the media packet header represent the TS of the first SBC frame
               i.e the timestamp before including this frame */
            *((UINT32 *) (p_buf + 1)) = btif_media_cb.timestamp;

            btif_media_cb.timestamp += p_buf->layer_specific * blocm_x_subband;

            VERBOSE("TX QUEUE NOW %d", btif_media_cb.TxAaQ.count);

            if (btif_media_cb.tx_flush)
            {
                APPL_TRACE_DEBUG("### tx suspended, discarded frame ###");

                if (btif_media_cb.TxAaQ.count > 0)
                    btif_media_flush_q(&(btif_media_cb.TxAaQ));

                GKI_freebuf(p_buf);
                return;
            }

            /* Enqueue the encoded SBC frame in AA Tx Queue */
            GKI_enqueue(&(btif_media_cb.TxAaQ), p_buf);
        }
        else
        {
            GKI_freebuf(p_buf);
        }
    }
}


/*******************************************************************************
 **
 ** Function         btif_media_aa_prep_2_send
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/

static void btif_media_aa_prep_2_send(UINT8 nb_frame)
{
    UINT32 pcm_bytes_per_frame = compute_pcm_bytes_per_frame();
    UINT32 max_pcm_bytes;
    UINT32 max_frames;

    max_pcm_bytes = btif_media_cb.media_feeding_state.pcm.bytes_per_tick *
                    MAX_OUTPUT_A2DP_QUEUE_MS /
                    BTIF_MEDIA_TIME_TICK;
    max_frames = max_pcm_bytes / pcm_bytes_per_frame;

    VERBOSE("%s() - frames=%d (queue=%d)", __FUNCTION__, nb_frame,
                                        btif_media_cb.TxAaQ.count)

    while (btif_media_cb.TxAaQ.count > (max_frames-nb_frame))
    {
        APPL_TRACE_WARNING("%s() - TX queue buffer count %d max_frames %d nb_frame %d",
            __FUNCTION__, btif_media_cb.TxAaQ.count, max_frames, nb_frame);
        GKI_freebuf(GKI_dequeue(&(btif_media_cb.TxAaQ)));
    }

    switch (btif_media_cb.TxTranscoding)
    {
    case BTIF_MEDIA_TRSCD_PCM_2_SBC:
        btif_media_aa_prep_sbc_2_send(nb_frame);
        break;


    default:
        APPL_TRACE_ERROR("ERROR btif_media_aa_prep_2_send unsupported transcoding format 0x%x",btif_media_cb.TxTranscoding);
        break;
    }
}

/*******************************************************************************
 **
 ** Function         btif_media_send_aa_frame
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
static void btif_media_send_aa_frame(void)
{
    UINT8 nb_frame_2_send;

    /* get the number of frame to send */
    nb_frame_2_send = btif_get_num_aa_frame();

    if (nb_frame_2_send != 0)
    {
        btif_media_aa_prep_2_send(nb_frame_2_send);
    }

    if (bt_systrace_log_enabled)
    {
        char trace_buf[1024];
        snprintf(trace_buf, 32, "btif_media_send_aa_frame:");
        ATRACE_BEGIN(trace_buf);
    }

    /* send it */

    if (bt_systrace_log_enabled)
    {
        ATRACE_END();
    }

    VERBOSE("btif_media_send_aa_frame : send %d frames", nb_frame_2_send);
    bta_av_ci_src_data_ready(BTA_AV_CHNL_AUDIO);
}

#endif /* BTA_AV_INCLUDED == TRUE */

/*******************************************************************************
 **
 ** Function         dump_codec_info
 **
 ** Description      Decode and display codec_info (for debug)
 **
 ** Returns          void
 **
 *******************************************************************************/
void dump_codec_info(unsigned char *p_codec)
{
    tA2D_STATUS a2d_status;
    tA2D_SBC_CIE sbc_cie;

    a2d_status = A2D_ParsSbcInfo(&sbc_cie, p_codec, FALSE);
    if (a2d_status != A2D_SUCCESS)
    {
        APPL_TRACE_ERROR("ERROR dump_codec_info A2D_ParsSbcInfo fail:%d", a2d_status);
        return;
    }

    APPL_TRACE_DEBUG("dump_codec_info");

    if (sbc_cie.samp_freq == A2D_SBC_IE_SAMP_FREQ_16)
    {    APPL_TRACE_DEBUG("\tsamp_freq:%d (16000)", sbc_cie.samp_freq);}
    else  if (sbc_cie.samp_freq == A2D_SBC_IE_SAMP_FREQ_32)
    {    APPL_TRACE_DEBUG("\tsamp_freq:%d (32000)", sbc_cie.samp_freq);}
    else  if (sbc_cie.samp_freq == A2D_SBC_IE_SAMP_FREQ_44)
    {    APPL_TRACE_DEBUG("\tsamp_freq:%d (44.100)", sbc_cie.samp_freq);}
    else  if (sbc_cie.samp_freq == A2D_SBC_IE_SAMP_FREQ_48)
    {    APPL_TRACE_DEBUG("\tsamp_freq:%d (48000)", sbc_cie.samp_freq);}
    else
    {    APPL_TRACE_DEBUG("\tBAD samp_freq:%d", sbc_cie.samp_freq);}

    if (sbc_cie.ch_mode == A2D_SBC_IE_CH_MD_MONO)
    {    APPL_TRACE_DEBUG("\tch_mode:%d (Mono)", sbc_cie.ch_mode);}
    else  if (sbc_cie.ch_mode == A2D_SBC_IE_CH_MD_DUAL)
    {    APPL_TRACE_DEBUG("\tch_mode:%d (Dual)", sbc_cie.ch_mode);}
    else  if (sbc_cie.ch_mode == A2D_SBC_IE_CH_MD_STEREO)
    {    APPL_TRACE_DEBUG("\tch_mode:%d (Stereo)", sbc_cie.ch_mode);}
    else  if (sbc_cie.ch_mode == A2D_SBC_IE_CH_MD_JOINT)
    {    APPL_TRACE_DEBUG("\tch_mode:%d (Joint)", sbc_cie.ch_mode);}
    else
    {    APPL_TRACE_DEBUG("\tBAD ch_mode:%d", sbc_cie.ch_mode);}

    if (sbc_cie.block_len == A2D_SBC_IE_BLOCKS_4)
    {    APPL_TRACE_DEBUG("\tblock_len:%d (4)", sbc_cie.block_len);}
    else  if (sbc_cie.block_len == A2D_SBC_IE_BLOCKS_8)
    {    APPL_TRACE_DEBUG("\tblock_len:%d (8)", sbc_cie.block_len);}
    else  if (sbc_cie.block_len == A2D_SBC_IE_BLOCKS_12)
    {    APPL_TRACE_DEBUG("\tblock_len:%d (12)", sbc_cie.block_len);}
    else  if (sbc_cie.block_len == A2D_SBC_IE_BLOCKS_16)
    {    APPL_TRACE_DEBUG("\tblock_len:%d (16)", sbc_cie.block_len);}
    else
    {    APPL_TRACE_DEBUG("\tBAD block_len:%d", sbc_cie.block_len);}

    if (sbc_cie.num_subbands == A2D_SBC_IE_SUBBAND_4)
    {    APPL_TRACE_DEBUG("\tnum_subbands:%d (4)", sbc_cie.num_subbands);}
    else  if (sbc_cie.num_subbands == A2D_SBC_IE_SUBBAND_8)
    {    APPL_TRACE_DEBUG("\tnum_subbands:%d (8)", sbc_cie.num_subbands);}
    else
    {    APPL_TRACE_DEBUG("\tBAD num_subbands:%d", sbc_cie.num_subbands);}

    if (sbc_cie.alloc_mthd == A2D_SBC_IE_ALLOC_MD_S)
    {    APPL_TRACE_DEBUG("\talloc_mthd:%d (SNR)", sbc_cie.alloc_mthd);}
    else  if (sbc_cie.alloc_mthd == A2D_SBC_IE_ALLOC_MD_L)
    {    APPL_TRACE_DEBUG("\talloc_mthd:%d (Loundess)", sbc_cie.alloc_mthd);}
    else
    {    APPL_TRACE_DEBUG("\tBAD alloc_mthd:%d", sbc_cie.alloc_mthd);}

    APPL_TRACE_DEBUG("\tBit pool Min:%d Max:%d", sbc_cie.min_bitpool, sbc_cie.max_bitpool);

}