source: svn/trunk/newcon3bcm2_21bu/magnum/commonutils/udp/budp_scteparse.h @ 2

/***************************************************************************
 *     Copyright (c) 2003-2010, 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: budp_scteparse.h $
 * $brcm_Revision: Hydra_Software_Devel/3 $
 * $brcm_Date: 10/28/10 4:00p $
 *
 * Module Description:
 *
 * Revision History:
 *
 * $brcm_Log: /magnum/commonutils/udp/budp_scteparse.h $
 * 
 * Hydra_Software_Devel/3   10/28/10 4:00p darnstein
 * SW3548-2364: trivial implementation of _isr functions for parsing.
 * 
 * Hydra_Software_Devel/2   7/27/10 7:14p darnstein
 * SW3548-3022: Some data structures involving SCTE-20 and SCTE-21 are
 * moved from BVBI portiing interface to BUDP commonutils module.
 * 
 * Hydra_Software_Devel/1   7/27/10 5:08p darnstein
 * SW3548-3022: userdata parsing software.
 * 
 ***************************************************************************/

/*= Module Overview *********************************************************
<verbatim>


Overview
BUDPSCTEparse module provides parsing of SCTE digital data.
This data occurs as userdata in MPEG bitstreams.  There are two
standards supported:  SCTE20 and SCTE21.

In general, this software accepts a buffer of data that contains
the MPEG userdata.  It parses out the SCTE data, and returns it as
an array of complex data structures.  Each data structure contains
SCTE data for output to a single video field. The data structures
can be sent directly to the VBI encoding software in the porting
interface (BUDP module).

</verbatim>
***************************************************************************/

#ifndef BUDPSCTEPARSE_H__
#define BUDPSCTEPARSE_H__

#include "bstd.h"
#include "bavc.h"
#include "berr.h"
#include "bavc.h"
#include "budp.h"

#ifdef __cplusplus
extern "C" {
#endif


/*****************************************************************************
 * Structures
 *****************************************************************************/

/***************************************************************************
Summary:
        This enum specifies the format used to encode SCTE data into MPEG
        userdata.
***************************************************************************/
typedef enum {
        BUDP_SCTEparse_Format_Unknown = 0,
        BUDP_SCTEparse_Format_SCTE20,
        BUDP_SCTEparse_Format_SCTE21CC,
        BUDP_SCTEparse_Format_SCTE21ACC,
        BUDP_SCTEparse_Format_SCTE21PAM
}
BUDP_SCTEparse_Format;

/***************************************************************************
Summary:
        This structure describes a "piece" of SCTE data extracted
        from MPEG userdata.

Description:
        BUDP_SCTEparse_sctedata is a "holder" for the SCTE
        data structure used by the porting interface module
        BVBI. The BUDP data structure adds a few needed extra
        bits of information.

        The format field indicates the method of encoding the SCTE
        datum into MPEG userdata.  

        The polarity field indicates whether the data belongs in
        a video top field or a bottom field.

***************************************************************************/
typedef struct {
        BAVC_Polarity polarity;
        BUDP_SCTEparse_Format format;
        BUDP_SCTE_Data data;
} BUDP_SCTEparse_sctedata;

/*****************************************************************************
 * Public API
 *****************************************************************************/

/*****************************************************************************
  Summary:
    Parses SCTE 20 data from a buffer of MPEG userdata.

  Description:
    This function accepts a "packet" of MPEG userdata and searches it for 
        SCTE 20 data.  

        In order to avoid having an output array of indefinite length, this
        function will only parse at most one "packet" of MPEG userdata from its
        input.  A "packet" is defined as the userdata that lies between two
        successive userdata start codes (0x000001B2).  Therefore, several calls to
        this function may be necessary to parse out all the userdata.  Parsing will
        be complete when the function returns a *pBytesParsed argument such that
        (offset + *pBytesParsed == pUserdata_info->ui32UserDataBufSize).

        The typical usage of this function is as follows:

    size_t offset = 0;
    while (offset < info->ui32UserDataBufSize)
    {
        eStatus = 
            BUDP_SCTE20parse_isr (
                                info, offset, &bytesParsed, &scte_count, sctedata);
        if (eStatus == BERR_SUCCESS)
        {
            int icount;
            for (icount = 0 ; icount < scte_count ; ++icount)
            {
                BUDP_SCTEparse_sctedata* psctedata = &sctedata[icount];

                                // Send psctedata->data to SCTE encoder. This
                                // data  must be sent on video field with polarity
                                // pscte->polarity.
            }
        }
                else if (eStatus == BERR_BUDP_NO_DATA)
                {
                        // Just keep looping, there may be more data to process.
                }
                else
                {
            // A real error, get out quick.
            return eStatus;
                }
                offset += bytesParsed;
        }

  Returns:
        BERR_SUCCESS              - The handle was successfully created.
        BERR_INVALID_PARAMETER    - One of the supplied parameters was invalid,
                                                            possibly NULL.
        BERR_BUDP_NO_DATA      - No SCTE data was found.  As the above
                                                                programming example shows, this is not really
                                                                an error.
        BERR_BUDP_PARSE_ERROR  - SCTE data was detected, but could not
                                    be successfully parsed.

 *****************************************************************************/
BERR_Code BUDP_SCTE20parse_isr ( 
        const BAVC_USERDATA_info* 
               pUserdata_info, /*  [in] The MPEG userdata to be parsed.          */
        size_t         offset, /*  [in] Parsing will start at this offset in the
                                        input buffer 
                                                                    userdata_info->pUserDataBuffer.          */
        size_t*  pBytesParsed, /* [out] The number of bytes parsed from the 
                                        input buffer 
                                                                        userdata_info->pUserDataBuffer.          */
        uint8_t*  pscte_count, /* [out] The length of the following output 
                                        array.  Will be between 0 and 31.        */
        BUDP_SCTEparse_sctedata* 
                    psctedata  /* [out] An array holding extracted SCTE data.
                                                    The user must provide an array of length
                                                                        32, to accomodate the maximum data that
                                                                        the standards will allow.                */
);
#define BUDP_SCTE20parse BUDP_SCTE20parse_isr

/*****************************************************************************
  Summary:
    Parses SCTE 21 data from a buffer of MPEG userdata.

  Description:
    This function accepts a "packet" of MPEG userdata and searches it for 
        SCTE 21 data.  

        In order to avoid having an output array of indefinite length, this
        function will only parse at most one "packet" of MPEG userdata from its
        input.  A "packet" is defined as the userdata that lies between two
        successive userdata start codes (0x000001B2).  Therefore, several calls to
        this function may be necessary to parse out all the userdata.  Parsing will
        be complete when the function returns a *pBytesParsed argument such that
        (offset + *pBytesParsed == pUserdata_info->ui32UserDataBufSize).

        The typical usage of this function is as follows:

    size_t offset = 0;
    while (offset < info->ui32UserDataBufSize)
    {
        eStatus = 
            BUDP_SCTE21parse_isr (
                                info, offset, &bytesParsed, &scte_count, sctedata);
        if (eStatus == BERR_SUCCESS)
        {
            int icount;
            for (icount = 0 ; icount < scte_count ; ++icount)
            {
                BUDP_SCTEparse_sctedata* psctedata = &sctedata[icount];

                                // Send psctedata->data to SCTE encoder. This
                                // data  must be sent on video field with polarity
                                // pscte->polarity.
            }
        }
                else if (eStatus == BERR_BUDP_NO_DATA)
                {
                        // Just keep looping, there may be more data to process.
                }
                else
                {
            // A real error, get out quick.
            return eStatus;
                }
                offset += bytesParsed;
        }

  Returns:
        BERR_SUCCESS              - The handle was successfully created.
        BERR_INVALID_PARAMETER    - One of the supplied parameters was invalid,
                                                            possibly NULL.
        BERR_BUDP_NO_DATA      - No SCTE data was found.  As the above
                                                                programming example shows, this is not really
                                                                an error.
        BERR_BUDP_PARSE_ERROR  - SCTE data was detected, but could not
                                    be successfully parsed.

 *****************************************************************************/
BERR_Code BUDP_SCTE21parse_isr ( 
        const BAVC_USERDATA_info* 
               pUserdata_info, /*  [in] The MPEG userdata to be parsed.          */
        size_t         offset, /*  [in] Parsing will start at this offset in the
                                        input buffer 
                                                                    userdata_info->pUserDataBuffer.          */
        size_t*  pBytesParsed, /* [out] The number of bytes parsed from the 
                                        input buffer 
                                                                        userdata_info->pUserDataBuffer.          */
        uint8_t*  pscte_count, /* [out] The length of the following output 
                                        array.  Will be between 0 and 31.        */
        BUDP_SCTEparse_sctedata* 
                    psctedata  /* [out] An array holding extracted SCTE data.
                                                    The user must provide an array of length
                                                                        32, to accomodate the maximum data that
                                                                        the standards will allow.                */
);
#define BUDP_SCTE21parse BUDP_SCTE21parse_isr

#ifdef __cplusplus
}
#endif

#endif /* BUDPSCTEPARSE_H__ */