source: svn/trunk/newcon3bcm2_21bu/dta/src/dcc/bcmDccTransport.h @ 76

/***************************************************************************
 *     Copyright (c) 2002, Broadcom Corporation
 *     All Rights Reserved
 *     Confidential Property of Broadcom Corporation
 *
 *  THIS SOFTWARE MAY ONLY BE USED SUBJECT TO AN EXECUTED SOFTWARE LICENSE
 *  AGREEMENT  BETWEEN THE USER AND BROADCOM.  YOU HAVE NO RIGHT TO USE OR
 *  EXPLOIT THIS MATERIAL EXCEPT SUBJECT TO THE TERMS OF SUCH AN AGREEMENT.
 *
 * $brcm_Workfile: bcmDccTransport.h $
 * $brcm_Revision: \main\SanJose_MSTV_Devel\1 $
 * $brcm_Date: 3/12/02 4:46p $
 *
 * Module Description:
 *
 * Revision History:
 *
 * $brcm_Log: $
 * 
 * \main\SanJose_MSTV_Devel\1   3/12/02 4:46p erikg
 * Merge from SanJose_MSTV_Devel_erikg_mpegccxport2_2002_03_06_1118_38
 *
 * \main\SanJose_MSTV_Devel_erikg_mpegccxport2_2002_03_06_1118_38\1   3/6/02 11:29a erikg
 * new include files
 * 
 ***************************************************************************/

#ifndef BCMDCCTRANSPORT_H
#define BCMDCCTRANSPORT_H

#ifdef __cplusplus
extern "C" {
#endif



                                                        /**********************
                                                         *
                                                         * INCLUDES
                                                         *
                                                         **********************/

#include "bcmDcc.h"
#include "bcmDccTransportMux.h"



                                                        /**********************
                                                         *
                                                         * DEFINES
                                                         *
                                                         **********************/

/*
 * DCC_TYPE_XXX
 *
 * These are bitmasks used for DccTransport_QueryDetectedFormats
 */
#define DCC_TYPE_DVS157                                 1
#define DCC_TYPE_A53_608                                2
#define DCC_TYPE_A53_DTVCC                              4
#define DCC_TYPE_UNKNOWN                                8

/*
 * Field Indicator, used for DccTransport_Process
 */
#define DCC_608_FIELD_TOP                               1
#define DCC_608_FIELD_BOTTOM                    2



                                                        /**********************
                                                         *
                                                         * TYPES
                                                         *
                                                         **********************/

/********************************************
 *
 * Enum:                        DCC_CC608_TYPE
 *
 * Description:
 *
 *   DCC_CC608_TYPE enumerates how the function
 *   DccTransport_Process is to choose which
 *   type of 608 to output.
 *
 ********************************************/
 typedef enum tagDCC_CC608_TYPE
 {
        CC608_A53                               = 0, /* A53 only */
        CC608_DVS157                    = 1, /* DVS157 only */
        CC608_A53Preferred              = 2  /* A53 if present, else DVS157 */
        
 } DCC_CC608_TYPE ;

 
/********************************************
 *
 * Structure:           DCC_TRANSPORT_OBJECT
 *
 * Description:
 *
 *   The DCC_TRANSPORT_OBJECT structure holds the
 *   state for an MPEG Picture User Data parsing
 *   session.
 *
 ********************************************/
typedef struct tagDCC_TRANSPORT_OBJECT
{
        /*
         * CC608Type
         *
         * The CC608Type enum specifies
         * which type of 608 is to be output
         * when DccTransport_Process is called.
         */
        DCC_CC608_TYPE                  CC608Type ;

        /*
         * CC608TypeStorage
         *
         * CC608TypeStorage is the state necessary
         * for keeping track of which type of 608
         * CC data is present in a stream.
         */
        DCC_CC608_MUX_STATE             CC608MuxState ;
        
} DCC_TRANSPORT_OBJECT ;



                                                        /**********************
                                                         *
                                                         * FUNCTIONS
                                                         *
                                                         **********************/

/**************************************************************************
 *
 * Function:            DccTransport_Init
 *
 * Inputs:                      
 *                                      pObj                            - object to init
 *                                      OutputType                      - defines which 608 CC type to output
 *
 * Outputs:             
 *                                      pObj                            - object state is modified
 *
 * Returns:                     dccSuccess or a standard DCCERR error code
 *
 * Description:
 *
 * This function initializes an MPEG CC transport session.
 *
 **************************************************************************/
DCCERR
DccTransport_Init(
        DCC_TRANSPORT_OBJECT * pObj,
        DCC_CC608_TYPE OutputType) ;


/**************************************************************************
 *
 * Function:            DccTransport_Fini
 *
 * Inputs:                      
 *                                      pObj                            - object, previously init'ed
 *
 * Outputs:             
 *                                      <none>
 *
 * Returns:                     dccSuccess or a standard DCCERR error code
 *
 * Description:
 *
 * This function undoes the initialization done by DccTransport_Init.
 *
 **************************************************************************/
DCCERR
DccTransport_Fini(DCC_TRANSPORT_OBJECT * pObj) ;


/**************************************************************************
 *
 * Function:            DccTransport_Process
 *
 * Inputs:                      
 *                                      pObj                            - object, previously init'ed
 *                                      pInputBuf                       - input buffer, holds 1/more User Data
 *                                      InputBufSize            - size in bytes of input buffer
 *                                      ulPicInfo                       - picture info from bcmMPIReadCCStatus
 *
 * Outputs:             
 *                                      p608BufInfo                     - describes output buf for 608, or NULL
 *                                      pDTVCCBufInfo           - describes output buf for DTVCC, or NULL
 *
 * Returns:                     dccSuccess or a standard DCCERR error code
 *
 * Description:
 * 
 * Reads the input buffer and copies CC data to the output buffer(s).  This 
 * function parses the looking for DTVCC Closed Captioning data or the type 
 * of 608 CC data specified in the DccTransport_Init function.  This function 
 * scans up to InputBufSize bytes of the pInputBuf buffer.  The parsing logic 
 * looks for Picture User Data start_codes, namely, the byte sequence 00 00 01 B2.  
 *
 * If multiple Picture User Data areas are found, each will be processed in order, 
 * and the CC bytes extracted from each will be copied to the output buffer(s).  If 
 * DTVCC Closed Captioning data is found and if pDTVCCBufInfo is not NULL, then 
 * DTVCC data is parsed and copied to pDTVCCBufInfo.  
 *
 * If p608BufInfo is not NULL, then this function will copy 608 Closed Captioning 
 * data according to the OutputType argument in the DccTransport_Init( ) call:
 *
 *    CC608_A53:           Only valid CC bytes from ATSC A/53 will be output.
 *    CC608_DVS157:        Only valid CC Bytes from DVS157 will be output.
 *    CC608_A53Preferred:  This function will track the presence of both A53 
 *                         and DVS157 formats.  If only one format is detected, 
 *                         it will be output.  If both formats are detected, A53 
 *                         will be output.  This algorithm uses a sliding window 
 *                                                 approach.
 *
 **************************************************************************/
DCCERR
DccTransport_Process(
        DCC_TRANSPORT_OBJECT *  pObj,
        unsigned char *                 pInputBuf,
        unsigned int                    InputBufSize,
        //unsigned long                 ulPicInfo,
        DCC_OUTBUF_INFO *               p608BufInfo,
        DCC_OUTBUF_INFO *               pDTVCCBufInfo) ;

        
/**************************************************************************
 *
 * Function:            DccTransport_QueryDetectedFormats
 *
 * Inputs:                      
 *                                      pObj                            - object, previously init'ed
 *
 * Outputs:             
 *                                      pDetectedFormats        - bitmask, each bit reps one format
 *                                                                                DCC_TYPE_DVS157
 *                                                                                DCC_TYPE_A53_608
 *                                                                                DCC_TYPE_A53_DTVCC
 *                                                                                DCC_TYPE_UNKNOWN
 *
 * Returns:                     dccSuccess or a standard DCCERR error code
 *
 * Description:
 * 
 * This function retrieves a bitmask representing which formats have been
 * detected in the stream.  This is useful because on any call to 
 * DccTransport_Process, the caller cannot merely look at the number of bytes
 * output for each output buffer to determine the detected formats.
 *
 **************************************************************************/
DCCERR
DccTransport_QueryDetectedFormats(
        DCC_TRANSPORT_OBJECT *  pObj,
        unsigned int *                  pDetectedFormats) ;





#ifdef __cplusplus
}
#endif

#endif /* BCMDCCTRANSPORT_H */