source: svn/newcon3bcm2_21bu/magnum/commonutils/udp/budp_dccparse_dss.h @ 46

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1/***************************************************************************
2 *     Copyright (c) 2003-2010, Broadcom Corporation
3 *     All Rights Reserved
4 *     Confidential Property of Broadcom Corporation
5 *
6 *  THIS SOFTWARE MAY ONLY BE USED SUBJECT TO AN EXECUTED SOFTWARE LICENSE
7 *  AGREEMENT  BETWEEN THE USER AND BROADCOM.  YOU HAVE NO RIGHT TO USE OR
8 *  EXPLOIT THIS MATERIAL EXCEPT SUBJECT TO THE TERMS OF SUCH AN AGREEMENT.
9 *
10 * $brcm_Workfile: budp_dccparse_dss.h $
11 * $brcm_Revision: Hydra_Software_Devel/2 $
12 * $brcm_Date: 10/28/10 3:59p $
13 *
14 * Module Description:
15 *
16 * Revision History:
17 *
18 * $brcm_Log: /magnum/commonutils/udp/budp_dccparse_dss.h $
19 *
20 * Hydra_Software_Devel/2   10/28/10 3:59p darnstein
21 * SW3548-2364: trivial implementation of _isr functions for parsing.
22 *
23 * Hydra_Software_Devel/1   10/21/10 4:10p darnstein
24 * SW7401-2571: DSS parser, converted from BVBIlib to BUDP.
25 *
26 ***************************************************************************/
27
28 /*= Module Overview *********************************************************
29
30* Handle DirecTV close caption data
31 ***************************************************************************/
32#ifndef BUDPDCCPARSEDSS_H__
33#define BUDPDCCPARSEDSS_H__
34
35#include "bstd.h"
36#include "bavc.h"
37#include "berr.h"
38#include "bavc.h"
39#include "budp.h"
40
41typedef enum {
42        BUDP_DCCparse_CC_Dss_Type_Undefined,
43        BUDP_DCCparse_CC_Dss_Type_ClosedCaption,
44        BUDP_DCCparse_CC_Dss_Type_Subtitle
45} BUDP_DCCparse_Dss_CC_Type;
46
47typedef struct {
48        bool bIsAnalog;
49        BAVC_Polarity polarity;
50        BUDP_DCCparse_Dss_CC_Type eCCType;
51        uint8_t cc_priority;
52        uint8_t language_type;          /* not exist in dss-sd CC, sub_title_language_type in GLA subtitle */
53        uint8_t cc_data_1;
54        uint8_t cc_data_2;
55} BUDP_DCCparse_dss_cc_subtitle;
56
57/*****************************************************************************
58  Summary:
59    Parses digital closed caption data from a buffer of DSS userdata.
60
61  Description:
62    This function accepts a "packet" of DSS userdata and searches
63    it for digital closed caption data.
64
65        In order to avoid having an output array of indefinite
66        length, this function will only parse at most one "packet"
67        of userdata from its input.  A "packet" is defined as the
68        userdata that lies between two successive userdata start
69        codes (0x000001B2).  Therefore, several calls to this
70        function may be necessary to parse out all the userdata.
71        Parsing will be complete when the function returns a
72        *pBytesParsed argument such that (offset + *pBytesParsed ==
73        pUserdata_info->ui32UserDataBufSize).
74
75        Consider that the closed caption data can only be
76        encoded analog if the associated bIsAnalog field is set.
77        This consideration, together with the need to call the
78        function multiple times (previous paragraph) implies that
79        the typical usage of this function is as follows:
80
81    size_t offset = 0;
82    while (offset < info->ui32UserDataBufSize)
83    {
84        eStatus =
85            BUDP_DCCparse_DSS_isr (
86                                info, offset, &bytesParsed, &cc_count, ccdata);
87        if (eStatus == BERR_SUCCESS)
88        {
89            int icount;
90            for (icount = 0 ; icount < cc_count ; ++icount)
91            {
92                BUDP_DCCparse_ccdata* pccdata = &ccdata[icount];
93                if (pccdata->bIsAnalog == true)
94                {
95                                     // Send pccdata->cc_data_1 and pccdata->cc_data_2
96                                         // to analog closed caption encoder, if any.  These
97                                         // bytes must be sent on video field with polarity
98                                         // pcc->polarity.
99                }
100                                // Possibly, send pccdata->cc_data_1 and pccdata->cc_data_2
101                                // to digital closed caption encoder.  The customer must
102                                // know if EIA-708-B processing is appropriate.
103            }
104        }
105                else if (eStatus == BERR_BUDP_NO_DATA)
106                {
107                        // Just keep looping, there may be more data to process.
108                }
109                else
110                {
111            // A real error, get out quick.
112            return eStatus;
113                }
114                offset += bytesParsed;
115        }
116
117  Returns:
118        BERR_SUCCESS              - The handle was successfully created.
119        BERR_INVALID_PARAMETER    - One of the supplied parameters was invalid,
120                                                            possibly NULL.
121        BERR_BUDP_NO_DATA      - No closed caption data was found.  As the above
122                                                                programming example shows, this is not really
123                                                                an error.
124        BERR_BUDP_PARSE_ERROR  - Closed caption data was detected, but could not
125                                    be successfully parsed.
126
127  See Also:
128 *****************************************************************************/
129BERR_Code BUDP_DCCparse_DSS_isr ( 
130        const BAVC_USERDATA_info* 
131               pUserdata_info, /*  [in] The MPEG userdata to be parsed.          */
132        size_t         offset, /*  [in] Parsing will start at this offset in the
133                                        input buffer
134                                                                    userdata_info->pUserDataBuffer.          */
135        size_t*  pBytesParsed, /* [out] The number of bytes parsed from the
136                                        input buffer
137                                                                        userdata_info->pUserDataBuffer.          */
138        uint8_t*    pcc_count, /* [out] The length of the following output
139                                        array.  Will be between 0 and 31.        */
140        BUDP_DCCparse_dss_cc_subtitle* 
141                      pCCdata,  /* [out] An array holding extracted closed
142                                                    caption data.  The user must provide an
143                                                                        array of length 32, to accomodate the
144                                                                        maximum data that the standards will
145                                                                        allow.                                   */
146        uint8_t*                 psubtitle_count, /*count for subtitle data */
147        BUDP_DCCparse_dss_cc_subtitle* pSubtitledata /*array holding extracted subtitle data */
148);
149#define BUDP_DCCparse_DSS BUDP_DCCparse_DSS_isr
150
151#endif /* BUDPDCCPARSEDSS_H__ */
152
153
154
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