btif/src/btif_media_task.c

/******************************************************************************
 *
 *  Copyright (C) 2009-2012 Broadcom Corporation
 *
 *  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
 **
 ******************************************************************************/

#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
#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

/*****************************************************************************
 **  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

#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_OUTPUT_A2DP_FRAME_QUEUE_SZ 18

#ifndef MAX_PCM_FRAME_NUM_PER_TICK
#define MAX_PCM_FRAME_NUM_PER_TICK     14
#endif

//#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 5
#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;
#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);

/*****************************************************************************
 **  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);
/*****************************************************************************
 **  Misc helper functions
 *****************************************************************************/

static UINT64 time_now_us()
{
    struct timespec ts_now;
    clock_gettime(CLOCK_BOOTTIME, &ts_now);
    return ((UINT64)ts_now.tv_sec * USEC_PER_SEC) + ((UINT64)ts_now.tv_nsec / 1000);
}

static void log_tstamps_us(char *comment)
{
    static UINT64 prev_us = 0;
    const UINT64 now_us = time_now_us();
    APPL_TRACE_DEBUG("[%s] ts %08llu, diff : %08llu, queue sz %d", comment, now_us, now_us - prev_us,
                GKI_queue_length(&btif_media_cb.TxAaQ));
    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";
    }
}

/*****************************************************************************
 **  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_START:

            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 */
                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) {
                /* Start the media task to encode SBC */
                btif_media_task_start_aa_req();

                /* make sure we update any changed sbc encoder params */
                btif_a2dp_encoder_update();
            }
            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)
        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
**
** Returns
**
*******************************************************************************/

void 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 44.1 khz 16 bit stereo PCM format */
    media_feeding.cfg.pcm.sampling_freq = 44100;
    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);
    }

    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");
    }
#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 ##");

    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)
/*******************************************************************************
 **
 ** 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;
        }

        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;
    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;
    }

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

    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;
    }

    UIPC_Send(UIPC_CH_ID_AV_AUDIO, 0, (UINT8 *)pcmData, (2*sizeof(pcmData) - availPcmBytes));
}
#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));
    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);

    /* 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));
    }
}

/*******************************************************************************
 **
 ** 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;
}

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);
}

/*******************************************************************************
 **
 ** 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;
    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");
}

/*******************************************************************************
 **
 ** 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);

    btif_media_cb.rx_flush = FALSE;
    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);
    }

    UIPC_Open(UIPC_CH_ID_AV_AUDIO, btif_a2dp_data_cb);

    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)
{
    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);
    btif_media_cb.is_tx_timer = FALSE;

    UIPC_Close(UIPC_CH_ID_AV_AUDIO);

    /* 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();
}

/*******************************************************************************
 **
 ** Function         btif_get_num_aa_frame
 **
 ** Description
 **
 ** Returns          The number of media frames in this time slice
 **
 *******************************************************************************/
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 = 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;

            UINT32 us_this_tick = BTIF_MEDIA_TIME_TICK * 1000;
            UINT64 now_us = time_now_us();
            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 GKI_queue_length(&btif_media_cb.RxSbcQ);
    if(GKI_queue_length(&btif_media_cb.RxSbcQ) == MAX_OUTPUT_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(GKI_queue_length(&btif_media_cb.RxSbcQ) == 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 GKI_queue_length(&btif_media_cb.RxSbcQ);
}

/*******************************************************************************
 **
 ** 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 (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 ",
                                GKI_queue_length(&btif_media_cb.TxAaQ));
            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 (GKI_queue_length(&btif_media_cb.TxAaQ) > 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)
{
    VERBOSE("%s() - frames=%d (queue=%d)", __FUNCTION__, nb_frame, btif_media_cb.TxAaQ.count);

    while (GKI_queue_length(&btif_media_cb.TxAaQ) >= (MAX_OUTPUT_A2DP_FRAME_QUEUE_SZ-nb_frame))
    {
        APPL_TRACE_WARNING("%s() - TX queue buffer count %d",
            __FUNCTION__, GKI_queue_length(&btif_media_cb.TxAaQ));
        GKI_freebuf(GKI_dequeue(&(btif_media_cb.TxAaQ)));
    }

    if (GKI_queue_length(&btif_media_cb.TxAaQ)) --nb_frame;

    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)
    {
        /* format and Q buffer to send */
        btif_media_aa_prep_2_send(nb_frame_2_send);
    }

    /* send it */
    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);

}