| 1 | /*************************************************************************** |
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| 2 | * Copyright (c) 2003-2011, Broadcom Corporation |
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| 3 | * All Rights Reserved |
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| 4 | * Confidential Property of Broadcom Corporation |
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| 5 | * |
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| 6 | * THIS SOFTWARE MAY ONLY BE USED SUBJECT TO AN EXECUTED SOFTWARE LICENSE |
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| 7 | * AGREEMENT BETWEEN THE USER AND BROADCOM. YOU HAVE NO RIGHT TO USE OR |
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| 8 | * EXPLOIT THIS MATERIAL EXCEPT SUBJECT TO THE TERMS OF SUCH AN AGREEMENT. |
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| 9 | * |
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| 10 | * $brcm_Workfile: budp_dccparse.c $ |
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| 11 | * $brcm_Revision: Hydra_Software_Devel/5 $ |
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| 12 | * $brcm_Date: 12/15/11 12:07a $ |
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| 13 | * |
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| 14 | * Module Description: |
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| 15 | * |
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| 16 | * Revision History: |
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| 17 | * |
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| 18 | * $brcm_Log: /magnum/commonutils/udp/budp_dccparse.c $ |
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| 19 | * |
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| 20 | * Hydra_Software_Devel/5 12/15/11 12:07a nilesh |
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| 21 | * SW7425-1967: Memset CC struct to 0 to prevent random data in unused |
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| 22 | * fields |
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| 23 | * |
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| 24 | * Hydra_Software_Devel/4 12/14/11 10:59p nilesh |
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| 25 | * SW7425-1967: Added support for SCTE20,SCTE21,and AFD53 in SEI userdata |
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| 26 | * |
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| 27 | * Hydra_Software_Devel/3 10/28/10 3:58p darnstein |
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| 28 | * SW3548-2364: trivial implementation of _isr functions for parsing. |
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| 29 | * |
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| 30 | * Hydra_Software_Devel/2 10/21/10 4:37p darnstein |
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| 31 | * SW7401-2571: cut over to the DSS userdata parser that DSS customer |
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| 32 | * engineers perfer. |
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| 33 | * |
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| 34 | * Hydra_Software_Devel/1 7/27/10 5:06p darnstein |
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| 35 | * SW3548-3022: userdata parsing software. |
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| 36 | * |
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| 37 | ***************************************************************************/ |
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| 38 | |
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| 39 | /* For debugging */ |
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| 40 | /* #define BUDP_P_GETUD_DUMP 1 */ |
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| 41 | #ifdef BUDP_P_GETUD_DUMP |
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| 42 | static const char* BUDP_P_Getud_Filename = "userdata.getud"; |
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| 43 | #include <stdio.h> |
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| 44 | #endif |
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| 45 | |
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| 46 | #include "bstd.h" |
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| 47 | #include "bavc.h" |
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| 48 | #include "bdbg.h" |
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| 49 | #include "bkni.h" |
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| 50 | #include "budp.h" |
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| 51 | #include "budp_bitread.h" |
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| 52 | #include "budp_dccparse.h" |
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| 53 | |
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| 54 | BDBG_MODULE(BUDP); |
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| 55 | |
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| 56 | |
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| 57 | /*************************************************************************** |
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| 58 | * Private data types |
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| 59 | ***************************************************************************/ |
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| 60 | |
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| 61 | /* Just used to switch among three types of internal parsers */ |
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| 62 | typedef enum { |
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| 63 | ParserType_eMpeg, /* Good old MPEG-2 userdata. */ |
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| 64 | ParserType_eSEI /* DSS userdata, AVC flavor (SEI). */ |
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| 65 | } ParserType; |
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| 66 | |
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| 67 | typedef struct { |
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| 68 | BUDP_DCCparse_Format type; |
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| 69 | BERR_Code (*parser) ( |
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| 70 | const BAVC_USERDATA_info* pUserdata_info, |
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| 71 | BUDP_Bitread_Context* pReader, |
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| 72 | size_t length, |
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| 73 | size_t* pBytesParsed, |
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| 74 | uint8_t* pcc_count, |
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| 75 | BUDP_DCCparse_ccdata* pCCdata |
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| 76 | ); |
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| 77 | } DigitalParser; |
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| 78 | |
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| 79 | |
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| 80 | /*************************************************************************** |
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| 81 | * Forward declarations of static (private) functions |
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| 82 | ***************************************************************************/ |
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| 83 | |
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| 84 | static BERR_Code BUDP_P_DCCparse ( |
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| 85 | ParserType eParserType, |
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| 86 | const BAVC_USERDATA_info* pUserdata_info, |
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| 87 | size_t offset, |
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| 88 | size_t* pBytesParsed, |
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| 89 | uint8_t* pcc_count, |
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| 90 | BUDP_DCCparse_ccdata* pCCdata); |
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| 91 | static size_t FindMpegUserdataStart ( |
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| 92 | BUDP_Bitread_Context* pREader, size_t length); |
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| 93 | static size_t FindSeiUserdataStart ( |
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| 94 | BUDP_Bitread_Context* pREader, size_t length); |
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| 95 | static BERR_Code ParseDVS157Data ( |
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| 96 | const BAVC_USERDATA_info* pUserdata_info, |
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| 97 | BUDP_Bitread_Context* pReader, |
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| 98 | size_t length, |
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| 99 | size_t* pBytesParsed, |
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| 100 | uint8_t* pcc_count, |
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| 101 | BUDP_DCCparse_ccdata* pCCdata); |
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| 102 | static BERR_Code ParseATSC53Data ( |
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| 103 | const BAVC_USERDATA_info* pUserdata_info, |
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| 104 | BUDP_Bitread_Context* pReader, |
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| 105 | size_t length, |
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| 106 | size_t* pBytesParsed, |
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| 107 | uint8_t* pcc_count, |
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| 108 | BUDP_DCCparse_ccdata* pCCdata); |
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| 109 | static BERR_Code ParseAFD53Data ( |
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| 110 | const BAVC_USERDATA_info* pUserdata_info, |
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| 111 | BUDP_Bitread_Context* pReader, |
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| 112 | size_t length, |
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| 113 | size_t* pBytesParsed, |
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| 114 | uint8_t* pcc_count, |
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| 115 | BUDP_DCCparse_ccdata* pCCdata); |
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| 116 | static BERR_Code ParseDVS053Data ( |
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| 117 | const BAVC_USERDATA_info* pUserdata_info, |
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| 118 | BUDP_Bitread_Context* pReader, |
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| 119 | size_t length, |
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| 120 | size_t* pBytesParsed, |
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| 121 | uint8_t* pcc_count, |
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| 122 | BUDP_DCCparse_ccdata* pCCdata); |
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| 123 | static BERR_Code ParseSEIData ( |
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| 124 | const BAVC_USERDATA_info* pUserdata_info, |
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| 125 | BUDP_Bitread_Context* pReader, |
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| 126 | size_t length, |
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| 127 | size_t* pBytesParsed, |
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| 128 | uint8_t* pcc_count, |
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| 129 | BUDP_DCCparse_ccdata* pCCdata |
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| 130 | ); |
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| 131 | static BERR_Code ParseSEIData2 ( |
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| 132 | const BAVC_USERDATA_info* pUserdata_info, |
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| 133 | BUDP_Bitread_Context* pReader, |
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| 134 | size_t length, |
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| 135 | size_t* pBytesParsed, |
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| 136 | uint8_t* pcc_count, |
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| 137 | BUDP_DCCparse_ccdata* pCCdata |
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| 138 | ); |
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| 139 | |
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| 140 | static int swap_bits (int src); |
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| 141 | |
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| 142 | #ifdef BUDP_P_GETUD_DUMP |
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| 143 | static void dump_getud ( |
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| 144 | const BAVC_USERDATA_info* pUserdata_info, size_t offset); |
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| 145 | #endif |
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| 146 | |
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| 147 | /* |
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| 148 | * This is the collection of methods for setting field polarity (top vs. |
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| 149 | * bottom) for closed caption data. |
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| 150 | */ |
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| 151 | /* Uses only cc_type attribute */ |
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| 152 | static void SetFieldsParity_SIMPLE ( |
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| 153 | BUDP_DCCparse_ccdata* pCCdata, |
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| 154 | uint8_t cc_count, |
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| 155 | const BAVC_USERDATA_info* pUserdata_info); |
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| 156 | /* Uses cc_type attribute and "top field first" attribute. */ |
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| 157 | static void SetFieldsParity_TFF ( |
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| 158 | BUDP_DCCparse_ccdata* pCCdata, |
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| 159 | uint8_t cc_count, |
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| 160 | const BAVC_USERDATA_info* pUserdata_info); |
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| 161 | /* Uses only order of data presented. */ |
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| 162 | static void SetFieldsParity_NOCCTYPE ( |
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| 163 | BUDP_DCCparse_ccdata* pCCdata, |
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| 164 | uint8_t cc_count, |
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| 165 | const BAVC_USERDATA_info* pUserdata_info); |
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| 166 | /* Uses field_number attribute */ |
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| 167 | static void SetFieldsParity_FIELDNUMBER ( |
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| 168 | BUDP_DCCparse_ccdata* pCCdata, |
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| 169 | uint8_t cc_count, |
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| 170 | const BAVC_USERDATA_info* pUserdata_info); |
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| 171 | /* Special method just for CC data from SEI */ |
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| 172 | static void SetFieldsParity_SEI ( |
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| 173 | BUDP_DCCparse_ccdata* pCCdata, |
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| 174 | uint8_t cc_count, |
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| 175 | const BAVC_USERDATA_info* pUserdata_info); |
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| 176 | |
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| 177 | /* |
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| 178 | * These macros determine which field polarity method (see above paragraph) |
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| 179 | * to use for parsing ATSC, DVS, and SEI closed caption data. You can override |
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| 180 | * these choices from the compiler command line. Make a choice from the above |
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| 181 | * paragraph. |
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| 182 | */ |
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| 183 | #ifndef BUDP_SETFIELDSPARITY_ATSC |
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| 184 | #define BUDP_SETFIELDSPARITY_ATSC SetFieldsParity_SIMPLE |
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| 185 | #endif |
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| 186 | #ifndef BUDP_SETFIELDSPARITY_DVS |
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| 187 | #define BUDP_SETFIELDSPARITY_DVS SetFieldsParity_FIELDNUMBER |
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| 188 | #endif |
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| 189 | #ifndef BUDP_SETFIELDSPARITY_SEI |
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| 190 | #define BUDP_SETFIELDSPARITY_SEI SetFieldsParity_SEI |
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| 191 | #endif |
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| 192 | |
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| 193 | |
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| 194 | /*************************************************************************** |
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| 195 | * Static data (tables, etc.) |
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| 196 | ***************************************************************************/ |
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| 197 | |
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| 198 | /* The array of digital CC data parsers. It does not include the DSS parser. |
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| 199 | * The DSS parser must be handled as a special case. This is because this |
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| 200 | * software collection cannot discover on its own that it is dealing with DSS |
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| 201 | * data. This software _can_ discriminate between the other forms of CC data, |
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| 202 | * listed in the following array: |
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| 203 | */ |
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| 204 | static const DigitalParser s_mpegParsers[] = { |
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| 205 | #ifndef ACB612 |
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| 206 | {BUDP_DCCparse_Format_DVS157, ParseDVS157Data}, |
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| 207 | #endif |
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| 208 | {BUDP_DCCparse_Format_ATSC53, ParseATSC53Data}, |
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| 209 | #ifndef ACB612 |
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| 210 | {BUDP_DCCparse_Format_DVS053, ParseDVS053Data}, |
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| 211 | #endif |
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| 212 | {BUDP_DCCparse_Format_AFD53, ParseAFD53Data} |
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| 213 | }; |
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| 214 | #define NUM_MPEG_PARSERS (sizeof(s_mpegParsers) / sizeof(s_mpegParsers[0])) |
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| 215 | |
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| 216 | static const DigitalParser s_seiParsers[] = { |
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| 217 | {BUDP_DCCparse_Format_SEI, ParseSEIData}, |
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| 218 | {BUDP_DCCparse_Format_SEI2, ParseSEIData2}, |
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| 219 | }; |
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| 220 | #define NUM_SEI_PARSERS (sizeof(s_seiParsers) / sizeof(s_seiParsers[0])) |
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| 221 | |
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| 222 | static const bool bByteswap = (BSTD_CPU_ENDIAN == BSTD_ENDIAN_LITTLE); |
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| 223 | |
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| 224 | |
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| 225 | /*************************************************************************** |
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| 226 | * Implementation of "BUDP_DCCparse_" API functions |
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| 227 | ***************************************************************************/ |
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| 228 | |
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| 229 | |
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| 230 | /*************************************************************************** |
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| 231 | * |
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| 232 | */ |
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| 233 | BERR_Code BUDP_DCCparse_isr ( |
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| 234 | const BAVC_USERDATA_info* pUserdata_info, |
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| 235 | size_t offset, |
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| 236 | size_t* pBytesParsed, |
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| 237 | uint8_t* pcc_count, |
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| 238 | BUDP_DCCparse_ccdata* pCCdata |
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| 239 | ) |
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| 240 | { |
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| 241 | return |
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| 242 | BUDP_P_DCCparse ( |
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| 243 | ParserType_eMpeg, pUserdata_info, offset, |
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| 244 | pBytesParsed, pcc_count, pCCdata); |
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| 245 | } |
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| 246 | |
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| 247 | /*************************************************************************** |
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| 248 | * |
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| 249 | */ |
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| 250 | BERR_Code BUDP_DCCparse_SEI_isr ( |
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| 251 | const BAVC_USERDATA_info* pUserdata_info, |
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| 252 | size_t offset, |
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| 253 | size_t* pBytesParsed, |
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| 254 | uint8_t* pcc_count, |
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| 255 | BUDP_DCCparse_ccdata* pCCdata |
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| 256 | ) |
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| 257 | { |
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| 258 | return |
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| 259 | BUDP_P_DCCparse ( |
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| 260 | ParserType_eSEI, pUserdata_info, offset, |
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| 261 | pBytesParsed, pcc_count, pCCdata); |
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| 262 | } |
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| 263 | |
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| 264 | |
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| 265 | /*************************************************************************** |
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| 266 | * Implementation of private (static) functions |
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| 267 | ***************************************************************************/ |
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| 268 | |
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| 269 | /*************************************************************************** |
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| 270 | * |
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| 271 | */ |
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| 272 | static BERR_Code BUDP_P_DCCparse ( |
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| 273 | ParserType eParserType, |
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| 274 | const BAVC_USERDATA_info* pUserdata_info, |
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| 275 | size_t offset, |
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| 276 | size_t* pBytesParsed, |
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| 277 | uint8_t* pcc_count, |
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| 278 | BUDP_DCCparse_ccdata* pCCdata |
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| 279 | ) |
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| 280 | { |
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| 281 | size_t bytesParsedSub; |
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| 282 | size_t length; |
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| 283 | uint8_t* userdata; |
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| 284 | unsigned int iparser; |
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| 285 | BERR_Code eErr; |
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| 286 | BUDP_Bitread_Context reader; |
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| 287 | BUDP_Bitread_Context savedReader; |
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| 288 | |
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| 289 | BDBG_ENTER(BUDP_DCCparse); |
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| 290 | |
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| 291 | /* Check for obvious errors from user */ |
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| 292 | if ((pUserdata_info == 0x0) || |
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| 293 | (pBytesParsed == 0x0) || |
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| 294 | (pcc_count == 0x0) || |
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| 295 | (pCCdata == 0x0) ) |
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| 296 | { |
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| 297 | return BERR_INVALID_PARAMETER; |
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| 298 | } |
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| 299 | |
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| 300 | /* Programming note: all function parameters are now validated */ |
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| 301 | |
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| 302 | |
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| 303 | #ifdef BUDP_P_GETUD_DUMP |
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| 304 | dump_getud (pUserdata_info, offset); |
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| 305 | #endif |
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| 306 | |
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| 307 | /* Take care of a special case */ |
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| 308 | userdata = (uint8_t*)(pUserdata_info->pUserDataBuffer) + offset; |
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| 309 | length = pUserdata_info->ui32UserDataBufSize - offset; |
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| 310 | if (length < 4) |
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| 311 | { |
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| 312 | *pBytesParsed = length; |
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| 313 | return BERR_BUDP_NO_DATA; |
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| 314 | } |
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| 315 | |
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| 316 | /* Prepare to play with bits */ |
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| 317 | BUDP_Bitread_Init (&reader, bByteswap, userdata); |
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| 318 | |
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| 319 | switch (eParserType) |
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| 320 | { |
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| 321 | case ParserType_eMpeg: |
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| 322 | |
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| 323 | /* jump past the first MPEG userdata start code */ |
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| 324 | bytesParsedSub = FindMpegUserdataStart (&reader, length); |
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| 325 | *pBytesParsed = bytesParsedSub; |
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| 326 | length -= bytesParsedSub; |
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| 327 | savedReader = reader; |
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| 328 | |
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| 329 | /* If we did not find a start code, bail out now */ |
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| 330 | if (length == 0) |
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| 331 | { |
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| 332 | return BERR_BUDP_NO_DATA; |
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| 333 | } |
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| 334 | |
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| 335 | /*********************************************************************\ |
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| 336 | * Programming note: each of the parsers will give up and return |
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| 337 | * BERR_BUDP_NO_DATA if it finds the wrong identifier byte. |
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| 338 | \*********************************************************************/ |
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| 339 | |
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| 340 | /* Try all the available parsers */ |
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| 341 | for (iparser = 0 ; iparser < NUM_MPEG_PARSERS ; ++iparser) |
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| 342 | { |
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| 343 | reader = savedReader; |
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| 344 | eErr = (*s_mpegParsers[iparser].parser) ( |
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| 345 | pUserdata_info, &reader, length, |
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| 346 | &bytesParsedSub, pcc_count, pCCdata); |
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| 347 | switch (eErr) |
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| 348 | { |
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| 349 | case BERR_SUCCESS: |
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| 350 | /* Sarnoff compliance check */ |
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| 351 | if ((pUserdata_info->eUserDataType == BAVC_USERDATA_Type_eSeq) |
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| 352 | || |
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| 353 | (pUserdata_info->eUserDataType == BAVC_USERDATA_Type_eGOP)) |
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| 354 | { |
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| 355 | eErr = BERR_BUDP_SOURCE_CHECK; |
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| 356 | } |
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| 357 | /* fall into the next case */ |
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| 358 | case BERR_BUDP_PARSE_ERROR: |
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| 359 | *pBytesParsed += bytesParsedSub; |
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| 360 | BDBG_LEAVE(BUDP_DCCparse); |
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| 361 | return eErr; |
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| 362 | break; |
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| 363 | case BERR_BUDP_NO_DATA: |
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| 364 | break; |
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| 365 | default: |
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| 366 | /* Programming error */ |
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| 367 | BDBG_ASSERT (false); |
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| 368 | break; |
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| 369 | } |
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| 370 | } |
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| 371 | break; |
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| 372 | |
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| 373 | case ParserType_eSEI: |
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| 374 | |
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| 375 | /* jump past the first SEI userdata start code */ |
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| 376 | bytesParsedSub = FindSeiUserdataStart (&reader, length); |
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| 377 | *pBytesParsed = bytesParsedSub; |
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| 378 | length -= bytesParsedSub; |
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| 379 | savedReader = reader; |
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| 380 | |
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| 381 | /* If we did not find a start code, bail out now */ |
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| 382 | if (length == 0) |
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| 383 | { |
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| 384 | return BERR_BUDP_NO_DATA; |
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| 385 | } |
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| 386 | |
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| 387 | /*********************************************************************\ |
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| 388 | * Programming note: each of the parsers will give up and return |
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| 389 | * BERR_BUDP_NO_DATA if it finds the wrong identifier byte. |
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| 390 | \*********************************************************************/ |
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| 391 | |
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| 392 | /* Try all available parsers */ |
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| 393 | for (iparser = 0 ; iparser < NUM_SEI_PARSERS ; ++iparser) |
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| 394 | { |
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| 395 | reader = savedReader; |
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| 396 | eErr = (*s_seiParsers[iparser].parser) ( |
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| 397 | pUserdata_info, &reader, length, |
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| 398 | &bytesParsedSub, pcc_count, pCCdata); |
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| 399 | switch (eErr) |
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| 400 | { |
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| 401 | case BERR_SUCCESS: |
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| 402 | case BERR_BUDP_PARSE_ERROR: |
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| 403 | *pBytesParsed += bytesParsedSub; |
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| 404 | BDBG_LEAVE(BUDP_DCCparse); |
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| 405 | return eErr; |
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| 406 | break; |
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| 407 | case BERR_BUDP_NO_DATA: |
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| 408 | break; |
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| 409 | default: |
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| 410 | /* Programming error */ |
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| 411 | BDBG_ASSERT (false); |
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| 412 | break; |
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| 413 | } |
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| 414 | } |
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| 415 | break; |
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| 416 | |
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| 417 | default: |
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| 418 | BDBG_ERR (("Programming error")); |
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| 419 | BDBG_ASSERT (0); |
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| 420 | break; |
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| 421 | |
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| 422 | } |
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| 423 | |
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| 424 | /* Programming note: |
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| 425 | * None of the parsers liked this bit of userdata. |
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| 426 | * It would be more elegant to skip to the next start code |
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| 427 | * before returning. But it is more efficient to simply |
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| 428 | * stop parsing. */ |
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| 429 | |
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| 430 | /* No userdata was found */ |
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| 431 | BDBG_LEAVE(BUDP_DCCparse); |
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| 432 | return BERR_BUDP_NO_DATA; |
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| 433 | } |
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| 434 | |
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| 435 | /*************************************************************************** |
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| 436 | * This function finds the next userdata startcode 0x000001B2. It |
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| 437 | * indicates the byte following this startcode by its return value. |
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| 438 | * If no startcode was found, it simply returns the length of the |
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| 439 | * input data. |
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| 440 | */ |
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| 441 | static size_t FindMpegUserdataStart ( |
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| 442 | BUDP_Bitread_Context* pReader, size_t length) |
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| 443 | { |
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| 444 | size_t count = 0; |
|---|
| 445 | uint8_t saved[4]; |
|---|
| 446 | |
|---|
| 447 | /* Special case (failure) */ |
|---|
| 448 | if (length < 4) |
|---|
| 449 | return length; |
|---|
| 450 | |
|---|
| 451 | /* Initialize */ |
|---|
| 452 | saved[1] = BUDP_Bitread_Byte (pReader); |
|---|
| 453 | saved[2] = BUDP_Bitread_Byte (pReader); |
|---|
| 454 | saved[3] = BUDP_Bitread_Byte (pReader); |
|---|
| 455 | |
|---|
| 456 | while (length >= 4) |
|---|
| 457 | { |
|---|
| 458 | /* Read in another byte */ |
|---|
| 459 | saved[0] = saved[1]; |
|---|
| 460 | saved[1] = saved[2]; |
|---|
| 461 | saved[2] = saved[3]; |
|---|
| 462 | saved[3] = BUDP_Bitread_Byte (pReader); |
|---|
| 463 | |
|---|
| 464 | if ((saved[0] == 0x00) && |
|---|
| 465 | (saved[1] == 0x00) && |
|---|
| 466 | (saved[2] == 0x01) && |
|---|
| 467 | (saved[3] == 0xB2) ) |
|---|
| 468 | { |
|---|
| 469 | /* Found it! */ |
|---|
| 470 | break; |
|---|
| 471 | } |
|---|
| 472 | |
|---|
| 473 | /* proceed to the next byte */ |
|---|
| 474 | --length; |
|---|
| 475 | ++count; |
|---|
| 476 | } |
|---|
| 477 | |
|---|
| 478 | if (length >= 4) |
|---|
| 479 | { |
|---|
| 480 | /* found the pattern before the end of stream */ |
|---|
| 481 | return count + 4; |
|---|
| 482 | } |
|---|
| 483 | else |
|---|
| 484 | { |
|---|
| 485 | /* Didn't find any start code */ |
|---|
| 486 | return count + 3; |
|---|
| 487 | } |
|---|
| 488 | } |
|---|
| 489 | |
|---|
| 490 | /*************************************************************************** |
|---|
| 491 | * This function finds the next userdata startcode 0x00000106. It |
|---|
| 492 | * indicates the byte following this startcode by its return value. |
|---|
| 493 | * If no startcode was found, it simply returns the length of the |
|---|
| 494 | * input data. |
|---|
| 495 | */ |
|---|
| 496 | static size_t FindSeiUserdataStart ( |
|---|
| 497 | BUDP_Bitread_Context* pReader, size_t length) |
|---|
| 498 | { |
|---|
| 499 | size_t count = 0; |
|---|
| 500 | uint8_t saved[4]; |
|---|
| 501 | |
|---|
| 502 | /* Special case (failure) */ |
|---|
| 503 | if (length < 4) |
|---|
| 504 | return length; |
|---|
| 505 | |
|---|
| 506 | /* Initialize */ |
|---|
| 507 | saved[1] = BUDP_Bitread_Byte (pReader); |
|---|
| 508 | saved[2] = BUDP_Bitread_Byte (pReader); |
|---|
| 509 | saved[3] = BUDP_Bitread_Byte (pReader); |
|---|
| 510 | |
|---|
| 511 | while (length >= 4) |
|---|
| 512 | { |
|---|
| 513 | /* Read in another byte */ |
|---|
| 514 | saved[0] = saved[1]; |
|---|
| 515 | saved[1] = saved[2]; |
|---|
| 516 | saved[2] = saved[3]; |
|---|
| 517 | saved[3] = BUDP_Bitread_Byte (pReader); |
|---|
| 518 | |
|---|
| 519 | if ((saved[0] == 0x00) && |
|---|
| 520 | (saved[1] == 0x00) && |
|---|
| 521 | (saved[2] == 0x01) && |
|---|
| 522 | (saved[3] == 0x06) ) |
|---|
| 523 | { |
|---|
| 524 | /* Found it! */ |
|---|
| 525 | break; |
|---|
| 526 | } |
|---|
| 527 | |
|---|
| 528 | /* proceed to the next byte */ |
|---|
| 529 | --length; |
|---|
| 530 | ++count; |
|---|
| 531 | } |
|---|
| 532 | |
|---|
| 533 | if (length >= 4) |
|---|
| 534 | { |
|---|
| 535 | /* found the pattern before the end of stream */ |
|---|
| 536 | return count + 4; |
|---|
| 537 | } |
|---|
| 538 | else |
|---|
| 539 | { |
|---|
| 540 | /* Didn't find any start code */ |
|---|
| 541 | return count + 3; |
|---|
| 542 | } |
|---|
| 543 | } |
|---|
| 544 | |
|---|
| 545 | /* TODO: figure out where to put this */ |
|---|
| 546 | #define MPEG_DVS157_VBI_DATA_FLAG 0x03 |
|---|
| 547 | |
|---|
| 548 | /*************************************************************************** |
|---|
| 549 | * This function parses DVS 157 data. It assumes that the userdata |
|---|
| 550 | * startcode 0x000001B2 has just been read. |
|---|
| 551 | */ |
|---|
| 552 | static BERR_Code ParseDVS157Data ( |
|---|
| 553 | const BAVC_USERDATA_info* pUserdata_info, |
|---|
| 554 | BUDP_Bitread_Context* pReader, |
|---|
| 555 | size_t length, |
|---|
| 556 | size_t* pBytesParsed, |
|---|
| 557 | uint8_t* pcc_count, |
|---|
| 558 | BUDP_DCCparse_ccdata* pCCdata |
|---|
| 559 | ) |
|---|
| 560 | { |
|---|
| 561 | size_t bitsParsed; |
|---|
| 562 | int icount; |
|---|
| 563 | |
|---|
| 564 | /* Special case */ |
|---|
| 565 | if (length == 0) |
|---|
| 566 | { |
|---|
| 567 | *pcc_count = 0; |
|---|
| 568 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 569 | } |
|---|
| 570 | |
|---|
| 571 | /* user_data_type_code(8) */ |
|---|
| 572 | if (BUDP_Bitread_Byte (pReader) != MPEG_DVS157_VBI_DATA_FLAG) |
|---|
| 573 | { |
|---|
| 574 | /* not DVS 157 data */ |
|---|
| 575 | *pBytesParsed = 1; |
|---|
| 576 | *pcc_count = 0; |
|---|
| 577 | return BERR_BUDP_NO_DATA; |
|---|
| 578 | } |
|---|
| 579 | |
|---|
| 580 | /* Start things off by recognizing that we have parsed one byte. |
|---|
| 581 | If an error occurs now, don't bother updating the count of |
|---|
| 582 | parsed bytes. |
|---|
| 583 | */ |
|---|
| 584 | --length; |
|---|
| 585 | *pBytesParsed = 1; |
|---|
| 586 | |
|---|
| 587 | if (length == 0) |
|---|
| 588 | { |
|---|
| 589 | /* Packet is too short */ |
|---|
| 590 | *pcc_count = 0; |
|---|
| 591 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 592 | } |
|---|
| 593 | |
|---|
| 594 | /* Skip '1000 000' bits (7) */ |
|---|
| 595 | /* vbi_data_flag(1) */ |
|---|
| 596 | if (!(BUDP_Bitread_Byte (pReader) & 0x01)) |
|---|
| 597 | { |
|---|
| 598 | /* No data for us. Prevent other parsers from trying though. */ |
|---|
| 599 | *pcc_count = 0; |
|---|
| 600 | return BERR_SUCCESS; |
|---|
| 601 | } |
|---|
| 602 | |
|---|
| 603 | --length; |
|---|
| 604 | *pBytesParsed += 1; |
|---|
| 605 | if (length == 0) |
|---|
| 606 | { |
|---|
| 607 | /* Packet is too short */ |
|---|
| 608 | *pcc_count = 0; |
|---|
| 609 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 610 | } |
|---|
| 611 | |
|---|
| 612 | /* Start the bit level parsing */ |
|---|
| 613 | *pcc_count = BUDP_Bitread_Read (pReader, 5); |
|---|
| 614 | bitsParsed = 5; |
|---|
| 615 | |
|---|
| 616 | for (icount = 0 ; icount < *pcc_count ; ++icount) |
|---|
| 617 | { |
|---|
| 618 | BKNI_Memset( &pCCdata[icount], 0, sizeof(pCCdata[icount])); |
|---|
| 619 | |
|---|
| 620 | /* Each sub-packet of data is 26 bits */ |
|---|
| 621 | if (length < 4) |
|---|
| 622 | { |
|---|
| 623 | /* Minimum packet length */ |
|---|
| 624 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 625 | } |
|---|
| 626 | |
|---|
| 627 | /* Not part of DVS157 standard! */ |
|---|
| 628 | pCCdata[icount].cc_valid = 1; |
|---|
| 629 | |
|---|
| 630 | pCCdata[icount].cc_priority = BUDP_Bitread_Read (pReader, 2); |
|---|
| 631 | |
|---|
| 632 | pCCdata[icount].seq.field_number = BUDP_Bitread_Read (pReader, 2); |
|---|
| 633 | |
|---|
| 634 | pCCdata[icount].line_offset = BUDP_Bitread_Read (pReader, 5); |
|---|
| 635 | |
|---|
| 636 | pCCdata[icount].cc_data_1 = |
|---|
| 637 | swap_bits(BUDP_Bitread_Byte (pReader)); |
|---|
| 638 | pCCdata[icount].cc_data_2 = |
|---|
| 639 | swap_bits(BUDP_Bitread_Byte (pReader)); |
|---|
| 640 | /* marker bit(1) */ |
|---|
| 641 | (void)BUDP_Bitread_Read (pReader, 1); |
|---|
| 642 | |
|---|
| 643 | /* Check for length violation again */ |
|---|
| 644 | /* bitsParsed += 26; */ |
|---|
| 645 | if (bitsParsed < 6) |
|---|
| 646 | { |
|---|
| 647 | length -= 3; |
|---|
| 648 | *pBytesParsed += 3; |
|---|
| 649 | bitsParsed += 2; |
|---|
| 650 | } |
|---|
| 651 | else |
|---|
| 652 | { |
|---|
| 653 | length -= 4; |
|---|
| 654 | *pBytesParsed += 4; |
|---|
| 655 | bitsParsed -= 6; |
|---|
| 656 | } |
|---|
| 657 | pCCdata[icount].format = BUDP_DCCparse_Format_DVS157; |
|---|
| 658 | } |
|---|
| 659 | |
|---|
| 660 | BUDP_SETFIELDSPARITY_DVS (pCCdata, *pcc_count, pUserdata_info); |
|---|
| 661 | return BERR_SUCCESS; |
|---|
| 662 | } |
|---|
| 663 | |
|---|
| 664 | /*************************************************************************** |
|---|
| 665 | * This function parses DVS 053 data. It assumes that the userdata |
|---|
| 666 | * startcode 0x000001B2 has just been read. |
|---|
| 667 | */ |
|---|
| 668 | static BERR_Code ParseDVS053Data ( |
|---|
| 669 | const BAVC_USERDATA_info* pUserdata_info, |
|---|
| 670 | BUDP_Bitread_Context* pReader, |
|---|
| 671 | size_t length, |
|---|
| 672 | size_t* pBytesParsed, |
|---|
| 673 | uint8_t* pcc_count, |
|---|
| 674 | BUDP_DCCparse_ccdata* pCCdata |
|---|
| 675 | ) |
|---|
| 676 | { |
|---|
| 677 | unsigned int cc_count; |
|---|
| 678 | unsigned int icount; |
|---|
| 679 | int data_found; |
|---|
| 680 | |
|---|
| 681 | /* Start counting */ |
|---|
| 682 | *pcc_count = 0; |
|---|
| 683 | |
|---|
| 684 | /* Special case */ |
|---|
| 685 | if (length < 4) |
|---|
| 686 | { |
|---|
| 687 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 688 | } |
|---|
| 689 | |
|---|
| 690 | /* ATSC identifier (4) */ |
|---|
| 691 | if ((BUDP_Bitread_Byte (pReader) != 0x47) || |
|---|
| 692 | (BUDP_Bitread_Byte (pReader) != 0x41) || |
|---|
| 693 | (BUDP_Bitread_Byte (pReader) != 0x39) || |
|---|
| 694 | (BUDP_Bitread_Byte (pReader) != 0x34) ) |
|---|
| 695 | { |
|---|
| 696 | /* not DVS 053 data */ |
|---|
| 697 | *pBytesParsed = 4; |
|---|
| 698 | return BERR_BUDP_NO_DATA; |
|---|
| 699 | } |
|---|
| 700 | |
|---|
| 701 | /* Start things off by recognizing that we have parsed four bytes. |
|---|
| 702 | If an error occurs now, don't bother updating the count of |
|---|
| 703 | parsed bytes. |
|---|
| 704 | */ |
|---|
| 705 | length -= 4; |
|---|
| 706 | *pBytesParsed = 4; |
|---|
| 707 | |
|---|
| 708 | if (length == 0) |
|---|
| 709 | { |
|---|
| 710 | /* Empty! */ |
|---|
| 711 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 712 | } |
|---|
| 713 | |
|---|
| 714 | /* user_data_type_code(8) */ |
|---|
| 715 | if (BUDP_Bitread_Byte (pReader) != 0x04) |
|---|
| 716 | { |
|---|
| 717 | /* not DVS 053 data */ |
|---|
| 718 | *pBytesParsed = 5; |
|---|
| 719 | return BERR_BUDP_NO_DATA; |
|---|
| 720 | } |
|---|
| 721 | |
|---|
| 722 | --length; |
|---|
| 723 | *pBytesParsed += 1; |
|---|
| 724 | if (length == 0) |
|---|
| 725 | { |
|---|
| 726 | /* Packet too short */ |
|---|
| 727 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 728 | } |
|---|
| 729 | |
|---|
| 730 | /* Skip marker bits(3) and dig out the count of cc data pairs(5) */ |
|---|
| 731 | cc_count = BUDP_Bitread_Byte (pReader) & 0x1F; |
|---|
| 732 | |
|---|
| 733 | /* This will be the last length check */ |
|---|
| 734 | --length; |
|---|
| 735 | *pBytesParsed += 1; |
|---|
| 736 | if (length < (3 * cc_count)) |
|---|
| 737 | { |
|---|
| 738 | /* Packet too short */ |
|---|
| 739 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 740 | } |
|---|
| 741 | *pBytesParsed += (3 * cc_count); |
|---|
| 742 | |
|---|
| 743 | /* Dig out the closed caption data pairs */ |
|---|
| 744 | data_found = 0; |
|---|
| 745 | for (icount = 0 ; icount < cc_count ; ++icount) |
|---|
| 746 | { |
|---|
| 747 | /* additional_cc_valid(1) */ |
|---|
| 748 | uint32_t additional_cc_valid = BUDP_Bitread_Read (pReader, 1); |
|---|
| 749 | |
|---|
| 750 | BKNI_Memset( &pCCdata[data_found], 0, sizeof(pCCdata[data_found])); |
|---|
| 751 | |
|---|
| 752 | pCCdata[data_found].cc_valid = additional_cc_valid; |
|---|
| 753 | |
|---|
| 754 | /* additional_cc_line_offset(5) */ |
|---|
| 755 | pCCdata[data_found].line_offset = BUDP_Bitread_Read (pReader, 5); |
|---|
| 756 | |
|---|
| 757 | /* additional_cc_field_number(2) */ |
|---|
| 758 | pCCdata[data_found].seq.field_number = |
|---|
| 759 | BUDP_Bitread_Read (pReader, 2); |
|---|
| 760 | |
|---|
| 761 | /* additional_cc_data_1(8) */ |
|---|
| 762 | pCCdata[data_found].cc_data_1 = |
|---|
| 763 | BUDP_Bitread_Byte (pReader); |
|---|
| 764 | |
|---|
| 765 | /* additional_cc_data_2(8) */ |
|---|
| 766 | pCCdata[data_found].cc_data_2 = |
|---|
| 767 | BUDP_Bitread_Byte (pReader); |
|---|
| 768 | |
|---|
| 769 | pCCdata[data_found].format = BUDP_DCCparse_Format_DVS053; |
|---|
| 770 | |
|---|
| 771 | /* Update count of items written to output data */ |
|---|
| 772 | ++data_found; |
|---|
| 773 | } |
|---|
| 774 | |
|---|
| 775 | BUDP_SETFIELDSPARITY_DVS (pCCdata, *pcc_count, pUserdata_info); |
|---|
| 776 | |
|---|
| 777 | *pcc_count = data_found; |
|---|
| 778 | return BERR_SUCCESS; |
|---|
| 779 | } |
|---|
| 780 | |
|---|
| 781 | |
|---|
| 782 | static BERR_Code ParseAFD53Data ( |
|---|
| 783 | const BAVC_USERDATA_info* pUserdata_info, |
|---|
| 784 | BUDP_Bitread_Context* pReader, |
|---|
| 785 | size_t length, |
|---|
| 786 | size_t* pBytesParsed, |
|---|
| 787 | uint8_t* pcc_count, |
|---|
| 788 | BUDP_DCCparse_ccdata* pCCdata |
|---|
| 789 | ) |
|---|
| 790 | { |
|---|
| 791 | uint32_t active_format_flag, active_format_data; |
|---|
| 792 | |
|---|
| 793 | BSTD_UNUSED (pUserdata_info); |
|---|
| 794 | |
|---|
| 795 | /* Indicate no data found (yet) */ |
|---|
| 796 | *pcc_count = 0; |
|---|
| 797 | |
|---|
| 798 | if (length < 4) |
|---|
| 799 | { |
|---|
| 800 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 801 | } |
|---|
| 802 | |
|---|
| 803 | /* AFD identifier (32) */ |
|---|
| 804 | if ((BUDP_Bitread_Byte (pReader) != 0x44) || |
|---|
| 805 | (BUDP_Bitread_Byte (pReader) != 0x54) || |
|---|
| 806 | (BUDP_Bitread_Byte (pReader) != 0x47) || |
|---|
| 807 | (BUDP_Bitread_Byte (pReader) != 0x31) ) |
|---|
| 808 | { |
|---|
| 809 | /* not AFD-53 data */ |
|---|
| 810 | *pBytesParsed = 4; |
|---|
| 811 | return BERR_BUDP_NO_DATA; |
|---|
| 812 | } |
|---|
| 813 | |
|---|
| 814 | |
|---|
| 815 | length -= 4; |
|---|
| 816 | *pBytesParsed = 4; |
|---|
| 817 | |
|---|
| 818 | if (length == 0) |
|---|
| 819 | { |
|---|
| 820 | /* Empty! */ |
|---|
| 821 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 822 | } |
|---|
| 823 | |
|---|
| 824 | (void)BUDP_Bitread_Read (pReader, 1); |
|---|
| 825 | |
|---|
| 826 | active_format_flag = BUDP_Bitread_Read (pReader, 1); |
|---|
| 827 | |
|---|
| 828 | if(!BUDP_Bitread_Read (pReader, 6)){ |
|---|
| 829 | *pBytesParsed = 5; |
|---|
| 830 | return BERR_BUDP_NO_DATA; |
|---|
| 831 | } |
|---|
| 832 | |
|---|
| 833 | --length; |
|---|
| 834 | *pBytesParsed = 5; |
|---|
| 835 | if (length == 0) |
|---|
| 836 | { |
|---|
| 837 | /* Packet too short */ |
|---|
| 838 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 839 | } |
|---|
| 840 | |
|---|
| 841 | if(active_format_flag) |
|---|
| 842 | { |
|---|
| 843 | active_format_data = BUDP_Bitread_Byte (pReader); |
|---|
| 844 | pCCdata[0].active_format = (uint8_t)active_format_data & 0x0f; |
|---|
| 845 | |
|---|
| 846 | --length; |
|---|
| 847 | *pBytesParsed = 6; |
|---|
| 848 | } |
|---|
| 849 | |
|---|
| 850 | |
|---|
| 851 | pCCdata[0].format = BUDP_DCCparse_Format_AFD53; |
|---|
| 852 | pCCdata[0].polarity = BAVC_Polarity_eTopField; |
|---|
| 853 | pCCdata[0].bIsAnalog = true; |
|---|
| 854 | pCCdata[0].cc_valid = 1; |
|---|
| 855 | *pcc_count = 1; |
|---|
| 856 | |
|---|
| 857 | return BERR_SUCCESS; |
|---|
| 858 | |
|---|
| 859 | } |
|---|
| 860 | |
|---|
| 861 | /*************************************************************************** |
|---|
| 862 | * This function parses ATSC 53 data. It assumes that the userdata |
|---|
| 863 | * startcode 0x000001B2 has just been read. |
|---|
| 864 | */ |
|---|
| 865 | static BERR_Code ParseATSC53Data ( |
|---|
| 866 | const BAVC_USERDATA_info* pUserdata_info, |
|---|
| 867 | BUDP_Bitread_Context* pReader, |
|---|
| 868 | size_t length, |
|---|
| 869 | size_t* pBytesParsed, |
|---|
| 870 | uint8_t* pcc_count, |
|---|
| 871 | BUDP_DCCparse_ccdata* pCCdata |
|---|
| 872 | ) |
|---|
| 873 | { |
|---|
| 874 | unsigned int cc_count; |
|---|
| 875 | unsigned int cc_valid; |
|---|
| 876 | unsigned int icount; |
|---|
| 877 | int data_found; |
|---|
| 878 | |
|---|
| 879 | BSTD_UNUSED (pUserdata_info); |
|---|
| 880 | |
|---|
| 881 | /* Start counting */ |
|---|
| 882 | *pcc_count = 0; |
|---|
| 883 | |
|---|
| 884 | /* Start travelling pointer into data */ |
|---|
| 885 | if (length < 4) |
|---|
| 886 | { |
|---|
| 887 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 888 | } |
|---|
| 889 | |
|---|
| 890 | /* ATSC identifier (32) */ |
|---|
| 891 | if ((BUDP_Bitread_Byte (pReader) != 0x47) || |
|---|
| 892 | (BUDP_Bitread_Byte (pReader) != 0x41) || |
|---|
| 893 | (BUDP_Bitread_Byte (pReader) != 0x39) || |
|---|
| 894 | (BUDP_Bitread_Byte (pReader) != 0x34) ) |
|---|
| 895 | { |
|---|
| 896 | /* not ATSC-53 data */ |
|---|
| 897 | *pBytesParsed = 4; |
|---|
| 898 | return BERR_BUDP_NO_DATA; |
|---|
| 899 | } |
|---|
| 900 | |
|---|
| 901 | /* Start things off by recognizing that we have parsed four bytes. |
|---|
| 902 | If an error occurs now, don't bother updating the count of |
|---|
| 903 | parsed bytes. |
|---|
| 904 | */ |
|---|
| 905 | length -= 4; |
|---|
| 906 | *pBytesParsed = 4; |
|---|
| 907 | |
|---|
| 908 | if (length == 0) |
|---|
| 909 | { |
|---|
| 910 | /* Empty! */ |
|---|
| 911 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 912 | } |
|---|
| 913 | |
|---|
| 914 | /* user_data_type_code(8) */ |
|---|
| 915 | if (BUDP_Bitread_Byte (pReader) != 0x03) |
|---|
| 916 | { |
|---|
| 917 | /* not ATSC-53 data */ |
|---|
| 918 | *pBytesParsed = 5; |
|---|
| 919 | return BERR_BUDP_NO_DATA; |
|---|
| 920 | } |
|---|
| 921 | |
|---|
| 922 | --length; |
|---|
| 923 | *pBytesParsed = 5; |
|---|
| 924 | if (length == 0) |
|---|
| 925 | { |
|---|
| 926 | /* Packet too short */ |
|---|
| 927 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 928 | } |
|---|
| 929 | |
|---|
| 930 | /* Skip process_em_data_flag(1) */ |
|---|
| 931 | (void)BUDP_Bitread_Read (pReader, 1); |
|---|
| 932 | |
|---|
| 933 | /* Dig out process_cc_data_flag(1) */ |
|---|
| 934 | if (!BUDP_Bitread_Read (pReader, 1)) |
|---|
| 935 | { |
|---|
| 936 | /* No closed caption data to process */ |
|---|
| 937 | *pBytesParsed = 6; |
|---|
| 938 | return BERR_BUDP_NO_DATA; |
|---|
| 939 | } |
|---|
| 940 | |
|---|
| 941 | /* Skip additional_data_flag(1) */ |
|---|
| 942 | (void)BUDP_Bitread_Read (pReader, 1); |
|---|
| 943 | |
|---|
| 944 | /* Dig out the count of cc data pairs */ |
|---|
| 945 | cc_count = BUDP_Bitread_Read (pReader, 5); |
|---|
| 946 | |
|---|
| 947 | --length; |
|---|
| 948 | *pBytesParsed = 6; |
|---|
| 949 | if (length == 0) |
|---|
| 950 | { |
|---|
| 951 | /* Packet too short */ |
|---|
| 952 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 953 | } |
|---|
| 954 | |
|---|
| 955 | /* Skip em_data(8) */ |
|---|
| 956 | (void)BUDP_Bitread_Byte (pReader); |
|---|
| 957 | |
|---|
| 958 | /* This will be the last length check */ |
|---|
| 959 | --length; |
|---|
| 960 | *pBytesParsed = 7; |
|---|
| 961 | if (length < (3 * cc_count)) |
|---|
| 962 | { |
|---|
| 963 | /* Packet too short */ |
|---|
| 964 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 965 | } |
|---|
| 966 | *pBytesParsed += (3 * cc_count); |
|---|
| 967 | |
|---|
| 968 | /* Dig out the closed caption data pairs */ |
|---|
| 969 | data_found = 0; |
|---|
| 970 | for (icount = 0 ; icount < cc_count ; ++icount) |
|---|
| 971 | { |
|---|
| 972 | /* Skip marker bits(5) */ |
|---|
| 973 | (void)BUDP_Bitread_Read (pReader, 5); |
|---|
| 974 | |
|---|
| 975 | BKNI_Memset( &pCCdata[data_found], 0, sizeof(pCCdata[data_found])); |
|---|
| 976 | |
|---|
| 977 | /* cc_valid(1) */ |
|---|
| 978 | cc_valid = BUDP_Bitread_Read (pReader, 1); |
|---|
| 979 | pCCdata[data_found].cc_valid = cc_valid; |
|---|
| 980 | |
|---|
| 981 | /* cc_type(2) */ |
|---|
| 982 | pCCdata[data_found].seq.cc_type = BUDP_Bitread_Read (pReader, 2); |
|---|
| 983 | |
|---|
| 984 | /* Kludge */ |
|---|
| 985 | pCCdata[data_found].line_offset = 11; |
|---|
| 986 | |
|---|
| 987 | /* additional_cc_data_1(8) */ |
|---|
| 988 | pCCdata[data_found].cc_data_1 = |
|---|
| 989 | BUDP_Bitread_Byte (pReader); |
|---|
| 990 | |
|---|
| 991 | /* additional_cc_data_2(8) */ |
|---|
| 992 | pCCdata[data_found].cc_data_2 = |
|---|
| 993 | BUDP_Bitread_Byte (pReader); |
|---|
| 994 | |
|---|
| 995 | pCCdata[data_found].format = BUDP_DCCparse_Format_ATSC53; |
|---|
| 996 | |
|---|
| 997 | /* Update count of items written to output data */ |
|---|
| 998 | /* Store data ordinary, closed caption data as well as CC708 data */ |
|---|
| 999 | ++data_found; |
|---|
| 1000 | } |
|---|
| 1001 | |
|---|
| 1002 | BUDP_SETFIELDSPARITY_ATSC (pCCdata, data_found, pUserdata_info); |
|---|
| 1003 | |
|---|
| 1004 | *pcc_count = data_found; |
|---|
| 1005 | return BERR_SUCCESS; |
|---|
| 1006 | } |
|---|
| 1007 | |
|---|
| 1008 | /*************************************************************************** |
|---|
| 1009 | * This function parses SEI user data. It assumes that the userdata |
|---|
| 1010 | * startcode 0x000001B2 has just been read. This is the old format used by a |
|---|
| 1011 | * particular customer circa June 2005. |
|---|
| 1012 | */ |
|---|
| 1013 | static BERR_Code ParseSEIData ( |
|---|
| 1014 | const BAVC_USERDATA_info* pUserdata_info, |
|---|
| 1015 | BUDP_Bitread_Context* pReader, |
|---|
| 1016 | size_t length, |
|---|
| 1017 | size_t* pBytesParsed, |
|---|
| 1018 | uint8_t* pcc_count, |
|---|
| 1019 | BUDP_DCCparse_ccdata* pCCdata |
|---|
| 1020 | ) |
|---|
| 1021 | { |
|---|
| 1022 | int index; |
|---|
| 1023 | uint8_t seiType; |
|---|
| 1024 | uint8_t userDataLength; |
|---|
| 1025 | uint8_t country_code; |
|---|
| 1026 | uint16_t manufacturers_code; |
|---|
| 1027 | uint8_t user_data_type_code; |
|---|
| 1028 | uint8_t user_data_code_length; |
|---|
| 1029 | uint8_t miscBits; |
|---|
| 1030 | uint8_t process_cc_data_flag; |
|---|
| 1031 | uint8_t cc_count; |
|---|
| 1032 | uint8_t cc_valid, cc_type, cc_data_1, cc_data_2; |
|---|
| 1033 | |
|---|
| 1034 | /* Start counting */ |
|---|
| 1035 | *pcc_count = 0; |
|---|
| 1036 | *pBytesParsed = 0; |
|---|
| 1037 | |
|---|
| 1038 | /* We must have at least one type byte and a length byte */ |
|---|
| 1039 | if (length < 2) |
|---|
| 1040 | { |
|---|
| 1041 | return BERR_BUDP_NO_DATA; |
|---|
| 1042 | } |
|---|
| 1043 | |
|---|
| 1044 | /* Read 8-bit type field */ |
|---|
| 1045 | seiType = BUDP_Bitread_Byte (pReader); |
|---|
| 1046 | (*pBytesParsed)++; |
|---|
| 1047 | if (seiType != 0x04) |
|---|
| 1048 | { |
|---|
| 1049 | return BERR_BUDP_NO_DATA;; |
|---|
| 1050 | } |
|---|
| 1051 | |
|---|
| 1052 | /* Read 8-bit length field */ |
|---|
| 1053 | userDataLength = BUDP_Bitread_Byte (pReader); |
|---|
| 1054 | (*pBytesParsed)++; |
|---|
| 1055 | |
|---|
| 1056 | /* A consistency check */ |
|---|
| 1057 | if (userDataLength > (unsigned)(length - 2)) |
|---|
| 1058 | { |
|---|
| 1059 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 1060 | } |
|---|
| 1061 | |
|---|
| 1062 | /* Prevent access violations */ |
|---|
| 1063 | if (userDataLength < 3) |
|---|
| 1064 | { |
|---|
| 1065 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 1066 | } |
|---|
| 1067 | |
|---|
| 1068 | /* Read 8-bit country code */ |
|---|
| 1069 | country_code = BUDP_Bitread_Byte (pReader); |
|---|
| 1070 | (*pBytesParsed)++; |
|---|
| 1071 | --userDataLength; |
|---|
| 1072 | if (country_code != 0xb5) |
|---|
| 1073 | { |
|---|
| 1074 | return BERR_BUDP_NO_DATA; |
|---|
| 1075 | } |
|---|
| 1076 | |
|---|
| 1077 | /* Read 16-bit manufacturers code */ |
|---|
| 1078 | manufacturers_code = BUDP_Bitread_Byte (pReader) << 8; |
|---|
| 1079 | manufacturers_code |= BUDP_Bitread_Byte (pReader); |
|---|
| 1080 | (*pBytesParsed) += 2; |
|---|
| 1081 | userDataLength -= 2; |
|---|
| 1082 | if (manufacturers_code != 0x002F) |
|---|
| 1083 | { |
|---|
| 1084 | return BERR_BUDP_NO_DATA; |
|---|
| 1085 | } |
|---|
| 1086 | |
|---|
| 1087 | while(userDataLength >= 2) |
|---|
| 1088 | { |
|---|
| 1089 | /* Read 8-bit type field */ |
|---|
| 1090 | user_data_type_code = BUDP_Bitread_Byte (pReader); |
|---|
| 1091 | (*pBytesParsed)++; |
|---|
| 1092 | --userDataLength; |
|---|
| 1093 | |
|---|
| 1094 | /* Read another length field */ |
|---|
| 1095 | user_data_code_length = BUDP_Bitread_Byte (pReader); |
|---|
| 1096 | (*pBytesParsed)++; |
|---|
| 1097 | --userDataLength; |
|---|
| 1098 | |
|---|
| 1099 | if (user_data_type_code == 3) |
|---|
| 1100 | { |
|---|
| 1101 | /* Begin cc_data */ |
|---|
| 1102 | |
|---|
| 1103 | /* Read and check reserved, process_cc_data_flag, and |
|---|
| 1104 | additional_data_flag (3 bits total) */ |
|---|
| 1105 | miscBits = BUDP_Bitread_Read (pReader, 1); |
|---|
| 1106 | if (miscBits != 0x01) |
|---|
| 1107 | { |
|---|
| 1108 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 1109 | } |
|---|
| 1110 | process_cc_data_flag = BUDP_Bitread_Read (pReader, 1); |
|---|
| 1111 | miscBits = BUDP_Bitread_Read (pReader, 1); |
|---|
| 1112 | if (miscBits != 0x00) |
|---|
| 1113 | { |
|---|
| 1114 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 1115 | } |
|---|
| 1116 | |
|---|
| 1117 | /* Read cc_count (5 bits) */ |
|---|
| 1118 | cc_count = BUDP_Bitread_Read (pReader, 5); |
|---|
| 1119 | |
|---|
| 1120 | (*pBytesParsed)++; |
|---|
| 1121 | --userDataLength; |
|---|
| 1122 | |
|---|
| 1123 | /* Consistency check */ |
|---|
| 1124 | if ((user_data_code_length != (cc_count * 3 + 3)) && |
|---|
| 1125 | (user_data_code_length != (cc_count * 3 + 4)) ) |
|---|
| 1126 | { |
|---|
| 1127 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 1128 | } |
|---|
| 1129 | /* Programming note: the second clause above is to support older, |
|---|
| 1130 | * non-compliant bitstreams. |
|---|
| 1131 | */ |
|---|
| 1132 | |
|---|
| 1133 | /* Read 8 reserved bits */ |
|---|
| 1134 | miscBits = BUDP_Bitread_Byte (pReader); |
|---|
| 1135 | if (miscBits != 0xFF) |
|---|
| 1136 | { |
|---|
| 1137 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 1138 | } |
|---|
| 1139 | (*pBytesParsed)++; |
|---|
| 1140 | --userDataLength; |
|---|
| 1141 | |
|---|
| 1142 | /* Length check for the following inner loop, plus trailing byte. */ |
|---|
| 1143 | if (userDataLength < (cc_count * 3 + 1)) |
|---|
| 1144 | { |
|---|
| 1145 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 1146 | } |
|---|
| 1147 | |
|---|
| 1148 | for (index = 0 ; index < cc_count ; ++index) |
|---|
| 1149 | { |
|---|
| 1150 | /* Read and check marker bits (5) */ |
|---|
| 1151 | miscBits = BUDP_Bitread_Read (pReader, 5); |
|---|
| 1152 | if (miscBits != 0x1F) |
|---|
| 1153 | { |
|---|
| 1154 | /* MiscBits should always be 0x1f but in practice |
|---|
| 1155 | some streams do not have them set and this would |
|---|
| 1156 | cause us to throw the whole thing out. So lets |
|---|
| 1157 | just continue after printing a warning. |
|---|
| 1158 | */ |
|---|
| 1159 | /*return BERR_BUDP_PARSE_ERROR;*/ |
|---|
| 1160 | BDBG_WRN(("Marker bits not set")); |
|---|
| 1161 | } |
|---|
| 1162 | |
|---|
| 1163 | /* Read some one-bit descriptors (2) */ |
|---|
| 1164 | cc_valid = BUDP_Bitread_Read (pReader, 1); |
|---|
| 1165 | cc_type = BUDP_Bitread_Read (pReader, 2); |
|---|
| 1166 | |
|---|
| 1167 | (*pBytesParsed)++; |
|---|
| 1168 | --userDataLength; |
|---|
| 1169 | |
|---|
| 1170 | /* Read the two bytes of closed caption data (16) */ |
|---|
| 1171 | cc_data_1 = BUDP_Bitread_Byte (pReader); |
|---|
| 1172 | (*pBytesParsed)++; |
|---|
| 1173 | --userDataLength; |
|---|
| 1174 | cc_data_2 = BUDP_Bitread_Byte (pReader); |
|---|
| 1175 | (*pBytesParsed)++; |
|---|
| 1176 | --userDataLength; |
|---|
| 1177 | |
|---|
| 1178 | /* Store the data if warranted */ |
|---|
| 1179 | if (process_cc_data_flag && miscBits == 0x1F) |
|---|
| 1180 | { |
|---|
| 1181 | pCCdata[*pcc_count].cc_valid = cc_valid; |
|---|
| 1182 | pCCdata[*pcc_count].seq.cc_type = cc_type; |
|---|
| 1183 | pCCdata[*pcc_count].cc_data_1 = cc_data_1; |
|---|
| 1184 | pCCdata[*pcc_count].cc_data_2 = cc_data_2; |
|---|
| 1185 | |
|---|
| 1186 | /* Kludge */ |
|---|
| 1187 | pCCdata[*pcc_count].line_offset = 11; |
|---|
| 1188 | |
|---|
| 1189 | pCCdata[*pcc_count].format = BUDP_DCCparse_Format_SEI; |
|---|
| 1190 | (*pcc_count)++; |
|---|
| 1191 | } |
|---|
| 1192 | |
|---|
| 1193 | } |
|---|
| 1194 | |
|---|
| 1195 | /* Read marker bits (8) */ |
|---|
| 1196 | miscBits = BUDP_Bitread_Byte (pReader); |
|---|
| 1197 | if (miscBits != 0xFF) |
|---|
| 1198 | { |
|---|
| 1199 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 1200 | } |
|---|
| 1201 | (*pBytesParsed)++; |
|---|
| 1202 | --userDataLength; |
|---|
| 1203 | } |
|---|
| 1204 | else |
|---|
| 1205 | { |
|---|
| 1206 | /* Skip over non-CC data */ |
|---|
| 1207 | if (user_data_code_length > 0) |
|---|
| 1208 | { |
|---|
| 1209 | for (index = 0 ; index < (user_data_code_length-1) ; ++index) |
|---|
| 1210 | BUDP_Bitread_Byte (pReader); |
|---|
| 1211 | *pBytesParsed += (user_data_code_length-1); |
|---|
| 1212 | userDataLength -= (user_data_code_length-1); |
|---|
| 1213 | } |
|---|
| 1214 | /* Programming note: within the above "if" clause, all instances of |
|---|
| 1215 | * (user_data_code_length-1) could be replaced with |
|---|
| 1216 | * user_data_code_length. But, I am trying to support older, |
|---|
| 1217 | * non-compliant bitstreams along with compliant bitstreams. In |
|---|
| 1218 | * this case, my strategy is to skip over the smaller number of |
|---|
| 1219 | * bytes, and trust that in the case of a compliant bitstream, the |
|---|
| 1220 | * next executing parser will manage to skip over the remaining |
|---|
| 1221 | * single byte. |
|---|
| 1222 | */ |
|---|
| 1223 | } |
|---|
| 1224 | } |
|---|
| 1225 | |
|---|
| 1226 | BUDP_SETFIELDSPARITY_SEI (pCCdata, *pcc_count, pUserdata_info); |
|---|
| 1227 | |
|---|
| 1228 | return BERR_SUCCESS; |
|---|
| 1229 | } |
|---|
| 1230 | |
|---|
| 1231 | /*************************************************************************** |
|---|
| 1232 | * This function parses SEI user data. It assumes that the userdata |
|---|
| 1233 | * startcode 0x000001B2 has just been read. This is the new format using |
|---|
| 1234 | * ATSC/53. |
|---|
| 1235 | */ |
|---|
| 1236 | static BERR_Code ParseSEIData2 ( |
|---|
| 1237 | const BAVC_USERDATA_info* pUserdata_info, |
|---|
| 1238 | BUDP_Bitread_Context* pReader, |
|---|
| 1239 | size_t length, |
|---|
| 1240 | size_t* pBytesParsed, |
|---|
| 1241 | uint8_t* pcc_count, |
|---|
| 1242 | BUDP_DCCparse_ccdata* pCCdata |
|---|
| 1243 | ) |
|---|
| 1244 | { |
|---|
| 1245 | uint8_t seiType; |
|---|
| 1246 | uint8_t userDataLength; |
|---|
| 1247 | uint8_t country_code; |
|---|
| 1248 | uint16_t manufacturers_code; |
|---|
| 1249 | BERR_Code eErr; |
|---|
| 1250 | size_t lBytesParsed = 0; |
|---|
| 1251 | |
|---|
| 1252 | /* We must have at least one type byte and a length byte */ |
|---|
| 1253 | if (length < 2) |
|---|
| 1254 | { |
|---|
| 1255 | return BERR_BUDP_NO_DATA;; |
|---|
| 1256 | } |
|---|
| 1257 | |
|---|
| 1258 | /* Read 8-bit type field */ |
|---|
| 1259 | seiType = BUDP_Bitread_Byte (pReader); |
|---|
| 1260 | ++lBytesParsed; |
|---|
| 1261 | if (seiType != 0x04) |
|---|
| 1262 | { |
|---|
| 1263 | return BERR_BUDP_NO_DATA;; |
|---|
| 1264 | } |
|---|
| 1265 | |
|---|
| 1266 | /* Read 8-bit length field */ |
|---|
| 1267 | userDataLength = BUDP_Bitread_Byte (pReader); |
|---|
| 1268 | ++lBytesParsed; |
|---|
| 1269 | |
|---|
| 1270 | /* A consistency check */ |
|---|
| 1271 | if (userDataLength > (unsigned)(length - 2)) |
|---|
| 1272 | { |
|---|
| 1273 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 1274 | } |
|---|
| 1275 | |
|---|
| 1276 | /* Prevent access violations */ |
|---|
| 1277 | if (userDataLength < 3) |
|---|
| 1278 | { |
|---|
| 1279 | return BERR_BUDP_PARSE_ERROR; |
|---|
| 1280 | } |
|---|
| 1281 | |
|---|
| 1282 | /* Read and ignore 8-bit country code */ |
|---|
| 1283 | country_code = BUDP_Bitread_Byte (pReader); |
|---|
| 1284 | ++lBytesParsed; |
|---|
| 1285 | --userDataLength; |
|---|
| 1286 | |
|---|
| 1287 | /* Read and ignore 16-bit provider code code */ |
|---|
| 1288 | manufacturers_code = BUDP_Bitread_Byte (pReader) << 8; |
|---|
| 1289 | manufacturers_code |= BUDP_Bitread_Byte (pReader); |
|---|
| 1290 | lBytesParsed += 2; |
|---|
| 1291 | userDataLength -= 2; |
|---|
| 1292 | |
|---|
| 1293 | { |
|---|
| 1294 | BUDP_Bitread_Context stSavedReader = *pReader; |
|---|
| 1295 | unsigned iparser; |
|---|
| 1296 | |
|---|
| 1297 | /* Try all the available parsers */ |
|---|
| 1298 | for (iparser = 0 ; iparser < NUM_MPEG_PARSERS ; ++iparser) |
|---|
| 1299 | { |
|---|
| 1300 | *pReader = stSavedReader; |
|---|
| 1301 | |
|---|
| 1302 | eErr = (*s_mpegParsers[iparser].parser) ( |
|---|
| 1303 | pUserdata_info, pReader, length - lBytesParsed, |
|---|
| 1304 | pBytesParsed, pcc_count, pCCdata ); |
|---|
| 1305 | switch (eErr) |
|---|
| 1306 | { |
|---|
| 1307 | case BERR_SUCCESS: |
|---|
| 1308 | /* Sarnoff compliance check */ |
|---|
| 1309 | if ((pUserdata_info->eUserDataType == BAVC_USERDATA_Type_eSeq) |
|---|
| 1310 | || |
|---|
| 1311 | (pUserdata_info->eUserDataType == BAVC_USERDATA_Type_eGOP)) |
|---|
| 1312 | { |
|---|
| 1313 | eErr = BERR_BUDP_SOURCE_CHECK; |
|---|
| 1314 | } |
|---|
| 1315 | /* fall into the next case */ |
|---|
| 1316 | case BERR_BUDP_PARSE_ERROR: |
|---|
| 1317 | *pBytesParsed += *pBytesParsed; |
|---|
| 1318 | BDBG_LEAVE(BUDP_DCCparse); |
|---|
| 1319 | return eErr; |
|---|
| 1320 | break; |
|---|
| 1321 | case BERR_BUDP_NO_DATA: |
|---|
| 1322 | break; |
|---|
| 1323 | default: |
|---|
| 1324 | /* Programming error */ |
|---|
| 1325 | BDBG_ASSERT (false); |
|---|
| 1326 | break; |
|---|
| 1327 | } |
|---|
| 1328 | } |
|---|
| 1329 | } |
|---|
| 1330 | |
|---|
| 1331 | *pBytesParsed += lBytesParsed; |
|---|
| 1332 | |
|---|
| 1333 | return eErr; |
|---|
| 1334 | } |
|---|
| 1335 | |
|---|
| 1336 | /*************************************************************************** |
|---|
| 1337 | * This function sets the topfield/bottomfield polarity for closed caption |
|---|
| 1338 | * data already extracted from the bitstream. It uses the order * in which |
|---|
| 1339 | * the digital data is presented, and top_field_first. |
|---|
| 1340 | */ |
|---|
| 1341 | static void SetFieldsParity_NOCCTYPE ( |
|---|
| 1342 | BUDP_DCCparse_ccdata* pCCdata, |
|---|
| 1343 | uint8_t cc_count, |
|---|
| 1344 | const BAVC_USERDATA_info* pUserdata_info) |
|---|
| 1345 | { |
|---|
| 1346 | bool top_field_first = pUserdata_info->bTopFieldFirst; |
|---|
| 1347 | bool repeat_first_field = pUserdata_info->bRepeatFirstField; |
|---|
| 1348 | BAVC_Polarity pictureStructure = pUserdata_info->eSourcePolarity; |
|---|
| 1349 | int icount; |
|---|
| 1350 | |
|---|
| 1351 | /* TODO: consider the case where there is cc_valid==0 data. Is the icount |
|---|
| 1352 | * ---- handling correct? |
|---|
| 1353 | */ |
|---|
| 1354 | |
|---|
| 1355 | for (icount = 0 ; icount < cc_count ; ++icount) |
|---|
| 1356 | { |
|---|
| 1357 | /* Skip invalid data */ |
|---|
| 1358 | if (pCCdata->cc_valid == 0) |
|---|
| 1359 | { |
|---|
| 1360 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1361 | pCCdata->bIsAnalog = false; |
|---|
| 1362 | ++pCCdata; |
|---|
| 1363 | continue; |
|---|
| 1364 | } |
|---|
| 1365 | |
|---|
| 1366 | /* This is the case of a (top or bottom) field picture */ |
|---|
| 1367 | if ((pictureStructure == BAVC_Polarity_eTopField) || |
|---|
| 1368 | (pictureStructure == BAVC_Polarity_eBotField) ) |
|---|
| 1369 | { |
|---|
| 1370 | pCCdata->polarity = pictureStructure; |
|---|
| 1371 | pCCdata->bIsAnalog = true; |
|---|
| 1372 | ++pCCdata; |
|---|
| 1373 | continue; |
|---|
| 1374 | } |
|---|
| 1375 | |
|---|
| 1376 | /* This is an MPEG syntax error. Punt. */ |
|---|
| 1377 | if (pictureStructure != BAVC_Polarity_eFrame) |
|---|
| 1378 | { |
|---|
| 1379 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1380 | pCCdata->bIsAnalog = false; |
|---|
| 1381 | ++pCCdata; |
|---|
| 1382 | continue; |
|---|
| 1383 | } |
|---|
| 1384 | |
|---|
| 1385 | /* This is an error. Punt. */ |
|---|
| 1386 | if (((icount > 2) && !repeat_first_field) || |
|---|
| 1387 | (icount > 3)) |
|---|
| 1388 | { |
|---|
| 1389 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1390 | pCCdata->bIsAnalog = false; |
|---|
| 1391 | ++pCCdata; |
|---|
| 1392 | continue; |
|---|
| 1393 | } |
|---|
| 1394 | |
|---|
| 1395 | /* This is the normal case. |
|---|
| 1396 | We are not relying on pCCdata->seq.cc_type to have a correct value, |
|---|
| 1397 | therefore we just use the index position of the data. */ |
|---|
| 1398 | if (cc_count == 1) { |
|---|
| 1399 | pCCdata->polarity = BAVC_Polarity_eTopField; |
|---|
| 1400 | } |
|---|
| 1401 | else { |
|---|
| 1402 | switch (icount&1) |
|---|
| 1403 | { |
|---|
| 1404 | case 0: |
|---|
| 1405 | pCCdata->polarity = |
|---|
| 1406 | (top_field_first ? |
|---|
| 1407 | BAVC_Polarity_eTopField : BAVC_Polarity_eBotField); |
|---|
| 1408 | break; |
|---|
| 1409 | default: /*case 1:*/ |
|---|
| 1410 | pCCdata->polarity = |
|---|
| 1411 | (top_field_first ? |
|---|
| 1412 | BAVC_Polarity_eBotField : BAVC_Polarity_eTopField); |
|---|
| 1413 | break; |
|---|
| 1414 | } |
|---|
| 1415 | } |
|---|
| 1416 | pCCdata->bIsAnalog = true; |
|---|
| 1417 | ++pCCdata; |
|---|
| 1418 | } |
|---|
| 1419 | } |
|---|
| 1420 | |
|---|
| 1421 | /*************************************************************************** |
|---|
| 1422 | * This function sets the topfield/bottomfield polarity for closed caption |
|---|
| 1423 | * data already extracted from the bitstream. It relies on the field_number |
|---|
| 1424 | * attribute, and top_field_first. |
|---|
| 1425 | */ |
|---|
| 1426 | static void SetFieldsParity_FIELDNUMBER ( |
|---|
| 1427 | BUDP_DCCparse_ccdata* pCCdata, |
|---|
| 1428 | uint8_t cc_count, |
|---|
| 1429 | const BAVC_USERDATA_info* pUserdata_info) |
|---|
| 1430 | { |
|---|
| 1431 | int icount; |
|---|
| 1432 | uint8_t field_number; |
|---|
| 1433 | bool top_field_first = pUserdata_info->bTopFieldFirst; |
|---|
| 1434 | bool repeat_first_field = pUserdata_info->bRepeatFirstField; |
|---|
| 1435 | BAVC_Polarity pictureStructure = pUserdata_info->eSourcePolarity; |
|---|
| 1436 | |
|---|
| 1437 | for (icount = 0 ; icount < cc_count ; ++icount) |
|---|
| 1438 | { |
|---|
| 1439 | /* Skip invalid data */ |
|---|
| 1440 | if (pCCdata->cc_valid == 0) |
|---|
| 1441 | { |
|---|
| 1442 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1443 | pCCdata->bIsAnalog = false; |
|---|
| 1444 | ++pCCdata; |
|---|
| 1445 | continue; |
|---|
| 1446 | } |
|---|
| 1447 | |
|---|
| 1448 | field_number = pCCdata->seq.field_number; |
|---|
| 1449 | |
|---|
| 1450 | switch (pictureStructure) |
|---|
| 1451 | { |
|---|
| 1452 | case BAVC_Polarity_eTopField: |
|---|
| 1453 | pCCdata->polarity = BAVC_Polarity_eTopField; |
|---|
| 1454 | pCCdata->bIsAnalog = true; |
|---|
| 1455 | break; |
|---|
| 1456 | case BAVC_Polarity_eBotField: |
|---|
| 1457 | pCCdata->polarity = BAVC_Polarity_eBotField; |
|---|
| 1458 | pCCdata->bIsAnalog = true; |
|---|
| 1459 | break; |
|---|
| 1460 | case BAVC_Polarity_eFrame: |
|---|
| 1461 | switch (field_number) |
|---|
| 1462 | { |
|---|
| 1463 | case 0: |
|---|
| 1464 | /* Forbidden! Punt! */ |
|---|
| 1465 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1466 | pCCdata->bIsAnalog = false; |
|---|
| 1467 | break; |
|---|
| 1468 | case 1: |
|---|
| 1469 | pCCdata->polarity = |
|---|
| 1470 | (top_field_first ? |
|---|
| 1471 | BAVC_Polarity_eTopField : BAVC_Polarity_eBotField); |
|---|
| 1472 | pCCdata->bIsAnalog = true; |
|---|
| 1473 | break; |
|---|
| 1474 | case 2: |
|---|
| 1475 | pCCdata->polarity = |
|---|
| 1476 | (top_field_first ? |
|---|
| 1477 | BAVC_Polarity_eBotField : BAVC_Polarity_eTopField); |
|---|
| 1478 | pCCdata->bIsAnalog = true; |
|---|
| 1479 | break; |
|---|
| 1480 | case 3: |
|---|
| 1481 | if (repeat_first_field) |
|---|
| 1482 | { |
|---|
| 1483 | pCCdata->polarity = |
|---|
| 1484 | (top_field_first ? |
|---|
| 1485 | BAVC_Polarity_eTopField : BAVC_Polarity_eBotField); |
|---|
| 1486 | pCCdata->bIsAnalog = true; |
|---|
| 1487 | } |
|---|
| 1488 | else |
|---|
| 1489 | { |
|---|
| 1490 | /* Makes no sense! Punt! */ |
|---|
| 1491 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1492 | pCCdata->bIsAnalog = false; |
|---|
| 1493 | } |
|---|
| 1494 | break; |
|---|
| 1495 | } |
|---|
| 1496 | break; |
|---|
| 1497 | default: |
|---|
| 1498 | /* No other picture types to consider! Punt! */ |
|---|
| 1499 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1500 | pCCdata->bIsAnalog = false; |
|---|
| 1501 | break; |
|---|
| 1502 | } |
|---|
| 1503 | ++pCCdata; |
|---|
| 1504 | } |
|---|
| 1505 | } |
|---|
| 1506 | |
|---|
| 1507 | /*************************************************************************** |
|---|
| 1508 | * This function sets the topfield/bottomfield polarity for closed caption |
|---|
| 1509 | * data already extracted from the bitstream. It uses the cc_type attribute, |
|---|
| 1510 | * and top_field_first. |
|---|
| 1511 | */ |
|---|
| 1512 | static void SetFieldsParity_TFF ( |
|---|
| 1513 | BUDP_DCCparse_ccdata* pCCdata, |
|---|
| 1514 | uint8_t cc_count, |
|---|
| 1515 | const BAVC_USERDATA_info* pUserdata_info) |
|---|
| 1516 | { |
|---|
| 1517 | bool top_field_first = pUserdata_info->bTopFieldFirst; |
|---|
| 1518 | bool repeat_first_field = pUserdata_info->bRepeatFirstField; |
|---|
| 1519 | BAVC_Polarity pictureStructure = pUserdata_info->eSourcePolarity; |
|---|
| 1520 | int icount; |
|---|
| 1521 | |
|---|
| 1522 | for (icount = 0 ; icount < cc_count ; ++icount) |
|---|
| 1523 | { |
|---|
| 1524 | /* Skip invalid data */ |
|---|
| 1525 | if (pCCdata->cc_valid == 0) |
|---|
| 1526 | { |
|---|
| 1527 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1528 | pCCdata->bIsAnalog = false; |
|---|
| 1529 | ++pCCdata; |
|---|
| 1530 | continue; |
|---|
| 1531 | } |
|---|
| 1532 | |
|---|
| 1533 | /* This is the case of a (top or bottom) field picture */ |
|---|
| 1534 | if ((pictureStructure == BAVC_Polarity_eTopField) || |
|---|
| 1535 | (pictureStructure == BAVC_Polarity_eBotField) ) |
|---|
| 1536 | { |
|---|
| 1537 | switch (pCCdata->seq.cc_type) |
|---|
| 1538 | { |
|---|
| 1539 | case 0: |
|---|
| 1540 | case 1: |
|---|
| 1541 | /* Top or bottom field, according to picture structure */ |
|---|
| 1542 | pCCdata->polarity = pictureStructure; |
|---|
| 1543 | pCCdata->bIsAnalog = true; |
|---|
| 1544 | break; |
|---|
| 1545 | default: |
|---|
| 1546 | /* Punt! */ |
|---|
| 1547 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1548 | pCCdata->bIsAnalog = false; |
|---|
| 1549 | break; |
|---|
| 1550 | } |
|---|
| 1551 | ++pCCdata; |
|---|
| 1552 | continue; |
|---|
| 1553 | } |
|---|
| 1554 | |
|---|
| 1555 | /* This is an MPEG syntax error. Punt. */ |
|---|
| 1556 | if (pictureStructure != BAVC_Polarity_eFrame) |
|---|
| 1557 | { |
|---|
| 1558 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1559 | pCCdata->bIsAnalog = false; |
|---|
| 1560 | ++pCCdata; |
|---|
| 1561 | continue; |
|---|
| 1562 | } |
|---|
| 1563 | |
|---|
| 1564 | /* This is an error. Punt. */ |
|---|
| 1565 | if (((icount > 2) && !repeat_first_field) || |
|---|
| 1566 | (icount > 3)) |
|---|
| 1567 | { |
|---|
| 1568 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1569 | pCCdata->bIsAnalog = false; |
|---|
| 1570 | ++pCCdata; |
|---|
| 1571 | continue; |
|---|
| 1572 | } |
|---|
| 1573 | |
|---|
| 1574 | /* This is the normal case */ |
|---|
| 1575 | switch (pCCdata->seq.cc_type) |
|---|
| 1576 | { |
|---|
| 1577 | case 0: |
|---|
| 1578 | pCCdata->polarity = |
|---|
| 1579 | (top_field_first ? |
|---|
| 1580 | BAVC_Polarity_eTopField : BAVC_Polarity_eBotField); |
|---|
| 1581 | pCCdata->bIsAnalog = true; |
|---|
| 1582 | break; |
|---|
| 1583 | case 1: |
|---|
| 1584 | pCCdata->polarity = |
|---|
| 1585 | (top_field_first ? |
|---|
| 1586 | BAVC_Polarity_eBotField : BAVC_Polarity_eTopField); |
|---|
| 1587 | pCCdata->bIsAnalog = true; |
|---|
| 1588 | break; |
|---|
| 1589 | default: |
|---|
| 1590 | /* Punt! */ |
|---|
| 1591 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1592 | pCCdata->bIsAnalog = false; |
|---|
| 1593 | break; |
|---|
| 1594 | } |
|---|
| 1595 | ++pCCdata; |
|---|
| 1596 | } |
|---|
| 1597 | } |
|---|
| 1598 | |
|---|
| 1599 | /*************************************************************************** |
|---|
| 1600 | * This function sets the topfield/bottomfield polarity for closed caption |
|---|
| 1601 | * data already extracted from the bitstream. It uses only the cc_type |
|---|
| 1602 | * attribute, and NOT top_field_first. |
|---|
| 1603 | */ |
|---|
| 1604 | static void SetFieldsParity_SIMPLE ( |
|---|
| 1605 | BUDP_DCCparse_ccdata* pCCdata, |
|---|
| 1606 | uint8_t cc_count, |
|---|
| 1607 | const BAVC_USERDATA_info* pUserdata_info) |
|---|
| 1608 | { |
|---|
| 1609 | bool repeat_first_field = pUserdata_info->bRepeatFirstField; |
|---|
| 1610 | BAVC_Polarity pictureStructure = pUserdata_info->eSourcePolarity; |
|---|
| 1611 | int icount; |
|---|
| 1612 | |
|---|
| 1613 | for (icount = 0 ; icount < cc_count ; ++icount) |
|---|
| 1614 | { |
|---|
| 1615 | /* Skip invalid data */ |
|---|
| 1616 | if (pCCdata->cc_valid == 0) |
|---|
| 1617 | { |
|---|
| 1618 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1619 | pCCdata->bIsAnalog = false; |
|---|
| 1620 | ++pCCdata; |
|---|
| 1621 | continue; |
|---|
| 1622 | } |
|---|
| 1623 | |
|---|
| 1624 | /* EIA-708-B has an odd restriction in the case of field pictures */ |
|---|
| 1625 | if (pictureStructure == BAVC_Polarity_eTopField) |
|---|
| 1626 | { |
|---|
| 1627 | if (pCCdata->seq.cc_type == 0) |
|---|
| 1628 | { |
|---|
| 1629 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1630 | pCCdata->bIsAnalog = false; |
|---|
| 1631 | ++pCCdata; |
|---|
| 1632 | continue; |
|---|
| 1633 | } |
|---|
| 1634 | } |
|---|
| 1635 | else if (pictureStructure == BAVC_Polarity_eBotField) |
|---|
| 1636 | { |
|---|
| 1637 | if (pCCdata->seq.cc_type == 1) |
|---|
| 1638 | { |
|---|
| 1639 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1640 | pCCdata->bIsAnalog = false; |
|---|
| 1641 | ++pCCdata; |
|---|
| 1642 | continue; |
|---|
| 1643 | } |
|---|
| 1644 | } |
|---|
| 1645 | |
|---|
| 1646 | /* This is an MPEG syntax error. Punt. */ |
|---|
| 1647 | else if (pictureStructure != BAVC_Polarity_eFrame) |
|---|
| 1648 | { |
|---|
| 1649 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1650 | pCCdata->bIsAnalog = false; |
|---|
| 1651 | ++pCCdata; |
|---|
| 1652 | continue; |
|---|
| 1653 | } |
|---|
| 1654 | |
|---|
| 1655 | /* This is an error. Punt. */ |
|---|
| 1656 | if (((icount > 2) && !repeat_first_field) || |
|---|
| 1657 | (icount > 3)) |
|---|
| 1658 | { |
|---|
| 1659 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1660 | pCCdata->bIsAnalog = false; |
|---|
| 1661 | ++pCCdata; |
|---|
| 1662 | continue; |
|---|
| 1663 | } |
|---|
| 1664 | |
|---|
| 1665 | /* This is the normal case. A nice, ordinary frame picture. */ |
|---|
| 1666 | switch (pCCdata->seq.cc_type) |
|---|
| 1667 | { |
|---|
| 1668 | case 0: |
|---|
| 1669 | pCCdata->polarity = BAVC_Polarity_eTopField; |
|---|
| 1670 | pCCdata->bIsAnalog = true; |
|---|
| 1671 | break; |
|---|
| 1672 | case 1: |
|---|
| 1673 | pCCdata->polarity = BAVC_Polarity_eBotField; |
|---|
| 1674 | pCCdata->bIsAnalog = true; |
|---|
| 1675 | break; |
|---|
| 1676 | default: |
|---|
| 1677 | /* Punt! */ |
|---|
| 1678 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1679 | pCCdata->bIsAnalog = false; |
|---|
| 1680 | break; |
|---|
| 1681 | } |
|---|
| 1682 | ++pCCdata; |
|---|
| 1683 | } |
|---|
| 1684 | } |
|---|
| 1685 | |
|---|
| 1686 | /*************************************************************************** |
|---|
| 1687 | * This function sets the topfield/bottomfield polarity for closed caption |
|---|
| 1688 | * data already extracted from the bitstream. It only uses cc_type. It is |
|---|
| 1689 | * even more simple than SetFieldsParity_SIMPLE, and is for use with closed |
|---|
| 1690 | * caption data extracted from SEI. |
|---|
| 1691 | */ |
|---|
| 1692 | static void SetFieldsParity_SEI ( |
|---|
| 1693 | BUDP_DCCparse_ccdata* pCCdata, |
|---|
| 1694 | uint8_t cc_count, |
|---|
| 1695 | const BAVC_USERDATA_info* pUserdata_info) |
|---|
| 1696 | { |
|---|
| 1697 | BAVC_Polarity pictureStructure = pUserdata_info->eSourcePolarity; |
|---|
| 1698 | int icount; |
|---|
| 1699 | |
|---|
| 1700 | for (icount = 0 ; icount < cc_count ; ++icount) |
|---|
| 1701 | { |
|---|
| 1702 | /* Skip invalid data */ |
|---|
| 1703 | if (pCCdata->cc_valid == 0) |
|---|
| 1704 | { |
|---|
| 1705 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1706 | pCCdata->bIsAnalog = false; |
|---|
| 1707 | ++pCCdata; |
|---|
| 1708 | continue; |
|---|
| 1709 | } |
|---|
| 1710 | |
|---|
| 1711 | /* This is an MPEG syntax error. Punt. */ |
|---|
| 1712 | if (pictureStructure != BAVC_Polarity_eTopField && |
|---|
| 1713 | pictureStructure != BAVC_Polarity_eBotField && |
|---|
| 1714 | pictureStructure != BAVC_Polarity_eFrame) |
|---|
| 1715 | { |
|---|
| 1716 | BDBG_ERR(("Unrecognized picture structure received (%d)", |
|---|
| 1717 | pictureStructure)); |
|---|
| 1718 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1719 | pCCdata->bIsAnalog = false; |
|---|
| 1720 | ++pCCdata; |
|---|
| 1721 | continue; |
|---|
| 1722 | } |
|---|
| 1723 | |
|---|
| 1724 | /* Normal case */ |
|---|
| 1725 | switch (pCCdata->seq.cc_type) |
|---|
| 1726 | { |
|---|
| 1727 | case 0: |
|---|
| 1728 | pCCdata->polarity = BAVC_Polarity_eTopField; |
|---|
| 1729 | pCCdata->bIsAnalog = true; |
|---|
| 1730 | break; |
|---|
| 1731 | case 1: |
|---|
| 1732 | pCCdata->polarity = BAVC_Polarity_eBotField; |
|---|
| 1733 | pCCdata->bIsAnalog = true; |
|---|
| 1734 | break; |
|---|
| 1735 | default: |
|---|
| 1736 | /* Punt! */ |
|---|
| 1737 | pCCdata->polarity = BAVC_Polarity_eFrame; |
|---|
| 1738 | pCCdata->bIsAnalog = false; |
|---|
| 1739 | break; |
|---|
| 1740 | } |
|---|
| 1741 | ++pCCdata; |
|---|
| 1742 | } |
|---|
| 1743 | } |
|---|
| 1744 | |
|---|
| 1745 | /*************************************************************************** |
|---|
| 1746 | * This function reverses the order of bits in a byte. |
|---|
| 1747 | */ |
|---|
| 1748 | static int swap_bits(int src) |
|---|
| 1749 | { |
|---|
| 1750 | int result; |
|---|
| 1751 | int i; |
|---|
| 1752 | |
|---|
| 1753 | for (result = 0, i = 0; i < 8; i++) |
|---|
| 1754 | { |
|---|
| 1755 | result = (result << 1) | (src & 1); |
|---|
| 1756 | src >>= 1; |
|---|
| 1757 | } |
|---|
| 1758 | return result; |
|---|
| 1759 | } |
|---|
| 1760 | |
|---|
| 1761 | /*************************************************************************** |
|---|
| 1762 | * This function serves to get rid of a compiler warning |
|---|
| 1763 | */ |
|---|
| 1764 | void BUDP_P_Quiet_Compiler ( |
|---|
| 1765 | BUDP_DCCparse_ccdata* pCCdata, |
|---|
| 1766 | uint8_t cc_count, |
|---|
| 1767 | const BAVC_USERDATA_info* pUserdata_info) |
|---|
| 1768 | { |
|---|
| 1769 | SetFieldsParity_SIMPLE ( pCCdata, cc_count, pUserdata_info); |
|---|
| 1770 | SetFieldsParity_TFF ( pCCdata, cc_count, pUserdata_info); |
|---|
| 1771 | SetFieldsParity_NOCCTYPE ( pCCdata, cc_count, pUserdata_info); |
|---|
| 1772 | SetFieldsParity_FIELDNUMBER ( pCCdata, cc_count, pUserdata_info); |
|---|
| 1773 | SetFieldsParity_SEI ( pCCdata, cc_count, pUserdata_info); |
|---|
| 1774 | } |
|---|
| 1775 | |
|---|
| 1776 | #ifdef BUDP_P_GETUD_DUMP |
|---|
| 1777 | static void dump_getud ( |
|---|
| 1778 | const BAVC_USERDATA_info* pUserdata_info, size_t offset) |
|---|
| 1779 | { |
|---|
| 1780 | unsigned int iByte; |
|---|
| 1781 | static FILE* fd = NULL; |
|---|
| 1782 | static unsigned int nPicture; |
|---|
| 1783 | uint8_t* userdata = (uint8_t*)(pUserdata_info->pUserDataBuffer) + offset; |
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| 1784 | size_t length = pUserdata_info->ui32UserDataBufSize - offset; |
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| 1785 | |
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| 1786 | /* Initialization */ |
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| 1787 | if (fd == NULL) |
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| 1788 | { |
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| 1789 | if ((fd = fopen (BUDP_P_Getud_Filename, "w")) == 0) |
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| 1790 | { |
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| 1791 | fprintf (stderr, "ERROR: could not open %s for debug output\n", |
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| 1792 | BUDP_P_Getud_Filename); |
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| 1793 | return; |
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| 1794 | } |
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| 1795 | fprintf (fd, "getud output format version 1\n"); |
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| 1796 | nPicture = 0; |
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| 1797 | } |
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| 1798 | |
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| 1799 | fprintf (fd, "\nPic %u LOC %06lx TR %u\n", ++nPicture, 0UL, 0U); |
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| 1800 | fprintf (fd, "PS %d TFF %d RFF %d\n", |
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| 1801 | pUserdata_info->eSourcePolarity, |
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| 1802 | pUserdata_info->bTopFieldFirst, |
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| 1803 | pUserdata_info->bRepeatFirstField); |
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| 1804 | fprintf (fd, "UDBYTES %u\n", length); |
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| 1805 | for (iByte = 0 ; iByte < length ; ++iByte) |
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| 1806 | { |
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| 1807 | fprintf (fd, "%02x", userdata[iByte]); |
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| 1808 | if ((iByte % 16) == 15) |
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| 1809 | putc ('\n', fd); |
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| 1810 | else |
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| 1811 | putc (' ', fd); |
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| 1812 | } |
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| 1813 | if ((iByte % 16) != 15) |
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| 1814 | putc ('\n', fd); |
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| 1815 | } |
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| 1816 | #endif |
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