btif/include/btif_media.h

/******************************************************************************
 *
 *  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.
 *
 ******************************************************************************/

/*******************************************************************************
 *
 *  Filename:      btif_media.h
 *
 *  Description:   This is the audio module for the BTIF system.
 *
 *******************************************************************************/

#ifndef BTIF_MEDIA_H
#define BTIF_MEDIA_H

#include "bta_api.h"
#include "bd.h"
#include "gki.h"
#include "btif_av_api.h"
#include "audio_a2dp_hw.h"

/*******************************************************************************
 **  Constants
 *******************************************************************************/

/* Generic part */
#define BTIF_SUCCESS                         0

/**
 * AV (Audio Video source) Errors
 */
#define BTIF_ERROR_SRV_AV_NOT_ENABLED        700     /* AV is not enabled */
#define BTIF_ERROR_SRV_AV_FEEDING_NOT_SUPPORTED 701  /* Requested Feeding not supported */
#define BTIF_ERROR_SRV_AV_BUSY               702     /* Another operation ongoing */
#define BTIF_ERROR_SRV_AV_NOT_OPENED         703     /* No AV link opened */
#define BTIF_ERROR_SRV_AV_NOT_STARTED        704     /* AV is not started */
#define BTIF_ERROR_SRV_AV_CP_NOT_SUPPORTED   705     /* Content protection is not supported by all headsets */

/* Transcoding definition for TxTranscoding and RxTranscoding */
#define BTIF_MEDIA_TRSCD_OFF             0
#define BTIF_MEDIA_TRSCD_PCM_2_SBC       1  /* Tx */


/*******************************************************************************
 **  Data types
 *******************************************************************************/

typedef int tBTIF_STATUS;

/* tBTIF_MEDIA_INIT_AUDIO msg structure */
typedef struct
{
        BT_HDR hdr;
        UINT16 SamplingFreq; /* 16k, 32k, 44.1k or 48k*/
        UINT8 ChannelMode; /* mono, dual, stereo or joint stereo*/
        UINT8 NumOfSubBands; /* 4 or 8 */
        UINT8 NumOfBlocks; /* 4, 8, 12 or 16*/
        UINT8 AllocationMethod; /* loudness or SNR*/
        UINT16 MtuSize; /* peer mtu size */
} tBTIF_MEDIA_INIT_AUDIO;

#if (BTA_AV_INCLUDED == TRUE)
/* tBTIF_MEDIA_UPDATE_AUDIO msg structure */
typedef struct
{
        BT_HDR hdr;
        UINT16 MinMtuSize; /* Minimum peer mtu size */
        UINT8 MaxBitPool; /* Maximum peer bitpool */
        UINT8 MinBitPool; /* Minimum peer bitpool */
} tBTIF_MEDIA_UPDATE_AUDIO;

/* tBTIF_MEDIA_INIT_AUDIO_FEEDING msg structure */
typedef struct
{
        BT_HDR hdr;
        tBTIF_AV_FEEDING_MODE feeding_mode;
        tBTIF_AV_MEDIA_FEEDINGS feeding;
} tBTIF_MEDIA_INIT_AUDIO_FEEDING;
#endif


/*******************************************************************************
 **  Public functions
 *******************************************************************************/

/*******************************************************************************
 **
 ** Function         btif_av_task
 **
 ** Description
 **
 ** Returns          void
 **
 *******************************************************************************/
extern int btif_media_task(void *p);

/*******************************************************************************
 **
 ** Function         btif_media_task_enc_init_req
 **
 ** Description      Request to initialize the media task encoder
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
extern BOOLEAN btif_media_task_enc_init_req(tBTIF_MEDIA_INIT_AUDIO * p_msg);

/*******************************************************************************
 **
 ** Function         btif_media_task_enc_update_req
 **
 ** Description      Request to update the media task encoder
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
#if (BTA_AV_INCLUDED == TRUE)
extern BOOLEAN btif_media_task_enc_update_req(tBTIF_MEDIA_UPDATE_AUDIO * p_msg);
#endif

/*******************************************************************************
 **
 ** Function         btif_media_task_start_aa_req
 **
 ** Description      Request to start audio encoding task
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
extern BOOLEAN btif_media_task_start_aa_req(void);

/*******************************************************************************
 **
 ** Function         btif_media_task_stop_aa_req
 **
 ** Description      Request to stop audio encoding task
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
extern BOOLEAN btif_media_task_stop_aa_req(void);


/*******************************************************************************
 **
 ** Function         btif_media_task_aa_tx_flush_req
 **
 ** Description      Request to flush audio encoding pipe
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
extern BOOLEAN btif_media_task_aa_tx_flush_req(void);

/*******************************************************************************
 **
 ** Function         btif_media_aa_readbuf
 **
 ** Description      Read an audio GKI buffer from the BTIF media TX queue
 **
 ** Returns          pointer on a GKI aa buffer ready to send
 **
 *******************************************************************************/
extern BT_HDR *btif_media_aa_readbuf(void);

/*******************************************************************************
 **
 ** Function         btif_media_aa_writebuf
 **
 ** Description      Enqueue a Advance Audio media GKI buffer to be processed by btif media task.
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
extern void btif_media_aa_writebuf(BT_HDR *pBuf, UINT32 timestamp, UINT16 seq_num);

/*******************************************************************************
 **
 ** Function         btif_media_av_writebuf
 **
 ** Description      Enqueue a video media GKI buffer to be processed by btif media task.
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/
extern BOOLEAN btif_media_av_writebuf(UINT8 *p_media, UINT32 media_len,
                                     UINT32 timestamp, UINT16 seq_num);

#if (BTA_AV_INCLUDED == TRUE)
/*******************************************************************************
 **
 ** Function         btif_media_task_audio_feeding_init_req
 **
 ** Description      Request to initialize audio feeding
 **
 ** Returns          TRUE is success
 **
 *******************************************************************************/

extern BOOLEAN btif_media_task_audio_feeding_init_req(tBTIF_MEDIA_INIT_AUDIO_FEEDING *p_msg);
#endif

/*******************************************************************************
 **
 ** Function         dump_codec_info
 **
 ** Description      Decode and display codec_info (for debug)
 **
 ** Returns          void
 **
 *******************************************************************************/
extern void dump_codec_info(unsigned char *p_codec);

/**
 * Local adaptation helper functions between btif and media task
 */

int btif_a2dp_start_media_task(void);
void btif_a2dp_stop_media_task(void);

void btif_a2dp_on_init(void);
void btif_a2dp_setup_codec(void);
void btif_a2dp_on_idle(void);
void btif_a2dp_on_open(void);
BOOLEAN btif_a2dp_on_started(tBTA_AV_START *p_av, BOOLEAN pending_start);
void btif_a2dp_ack_fail(void);
void btif_a2dp_on_stop_req(void);
void btif_a2dp_on_stopped(tBTA_AV_SUSPEND *p_av);
void btif_a2dp_on_suspend(void);
void btif_a2dp_on_suspended(tBTA_AV_SUSPEND *p_av);
void btif_a2dp_set_tx_flush(BOOLEAN enable);

#endif