| 1 | /*************************************************************************** |
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| 2 | * Copyright (c) 2002, 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: bcmDccBits.h $ |
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| 11 | * $brcm_Revision: SanJose_MSTV_Devel\2 $ |
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| 12 | * $brcm_Date: 5/13/02 1:14p $ |
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| 13 | * |
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| 14 | * Module Description: |
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| 15 | * |
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| 16 | * This module contains functions useful for extracting bits |
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| 17 | * from a byte stream. |
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| 18 | * |
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| 19 | * Revision History: |
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| 20 | * |
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| 21 | * $brcm_Log: \SetTop\applications\vbi\Common\bcmDccBits.h $ |
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| 22 | * |
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| 23 | * SanJose_MSTV_Devel\2 5/13/02 1:14p erikg |
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| 24 | * snapshot of dtvcc code Merge from |
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| 25 | * SanJose_MSTV_Devel_erikg_DTVCC_Int_2002_05_02_1128_00 13-May- |
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| 26 | * 02.11:55:52 \SetTop\applications\vbi Added directory element |
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| 27 | * "DTVCCLib". --- 13-May-02.13:08:38 \SetTop\applications\vbi\Common |
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| 28 | * First version of the Dcc 708 Rendering Libraries --- 13-May- |
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| 29 | * 02.13:08:10 \SetTop\applications\vbi\Common\bcmDccBits.h Added ifdef |
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| 30 | * to ensure included only once. |
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| 31 | * Added extern "C" for __cplusplus --- 13-May-02.13:07:04 |
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| 32 | * \SetTop\applications\vbi\MPEGCCTransportLib\source\bcmDccTransportPars |
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| 33 | * e.c NextStartCode() now specifically scans for start codes until it |
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| 34 | * finds |
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| 35 | * 00 00 01 B2. --- 13-May-02.13:08:40 |
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| 36 | * \SetTop\applications\vbi\Common@@\main\SanJose_MSTV_Devel\SanJose_MSTV |
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| 37 | * _Devel_erikg_DTVCC_Int_2002_05_02_1128_00\1\bcmDccCBuf.c First version |
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| 38 | * of the Dcc 708 Rendering Libraries --- 13-May-02.13:08:43 |
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| 39 | * \SetTop\applications\vbi\Common@@\main\SanJose_MSTV_Devel\SanJose_MSTV |
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| 40 | * _Devel_erikg_DTVCC_Int_2002_05_02_1128_00\1\bcmDccCBuf.h First version |
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| 41 | * of the Dcc 708 Rendering Libraries --- 13-May-02.11:55:59 |
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| 42 | * \SetTop\applications\vbi@@\main\SanJose_MSTV_Devel\SanJose_MSTV_Devel_ |
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| 43 | * erikg_DTVCC_Int_2002_05_02_1128_00\1\DTVCCLib Added directory element |
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| 44 | * "source". Added directory element "public_inc". --- |
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| 45 | * |
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| 46 | * SanJose_MSTV_Devel\SanJose_MSTV_Devel_erikg_DTVCC_Int_2002_05_02_1128_00\1 5/13/02 1:8p erikg |
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| 47 | * Added ifdef to ensure included only once. |
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| 48 | * Added extern "C" for __cplusplus |
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| 49 | * |
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| 50 | * \main\SanJose_MSTV_Devel\1 3/12/02 4:46p erikg |
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| 51 | * Merge from SanJose_MSTV_Devel_erikg_mpegccxport2_2002_03_06_1118_38 |
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| 52 | * |
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| 53 | * \main\SanJose_MSTV_Devel_erikg_mpegccxport2_2002_03_06_1118_38\1 3/6/02 11:29a erikg |
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| 54 | * new source files |
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| 55 | * |
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| 56 | ***************************************************************************/ |
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| 57 | |
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| 58 | |
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| 59 | |
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| 60 | /************************************************************************* |
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| 61 | * |
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| 62 | * MODULE DETAILS: |
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| 63 | * |
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| 64 | * The functions in this module operate on bits in a byte buffer (array). |
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| 65 | * Each function is given a pointer to the buffer and a byte offset and a |
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| 66 | * bit offset indicating the current position in the buffer. The byte/bit |
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| 67 | * offsets are either ints or int pointers, depending on whether or not |
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| 68 | * the current position is to be updated. |
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| 69 | * |
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| 70 | * It is assumed that the first bit to be operated on is in the msb position, |
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| 71 | * that is, 0x80. |
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| 72 | * |
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| 73 | *************************************************************************/ |
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| 74 | |
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| 75 | |
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| 76 | #ifndef BCMDCCBITS_H |
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| 77 | #define BCMDCCBITS_H |
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| 78 | |
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| 79 | #ifdef __cplusplus |
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| 80 | extern "C" { |
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| 81 | #endif |
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| 82 | |
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| 83 | |
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| 84 | /************************************************************************* |
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| 85 | * |
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| 86 | * FUNCTION: getnextbit |
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| 87 | * |
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| 88 | * Inputs: |
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| 89 | * pBuf - stream buffer |
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| 90 | * pbyteoff - current byte offset into pBuf |
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| 91 | * pbitoff - bit offset into current byte |
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| 92 | * |
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| 93 | * Outputs: |
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| 94 | * pbyteoff - current byte offset into pBuf |
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| 95 | * pbitoff - bit offset into current byte |
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| 96 | * |
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| 97 | * Returns: the requested bit, 0 or 1 |
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| 98 | * |
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| 99 | * Description: |
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| 100 | * |
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| 101 | * This function returns the next bit and increments the position. |
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| 102 | * |
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| 103 | *************************************************************************/ |
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| 104 | unsigned int |
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| 105 | getnextbit(unsigned char * pBuf, int * pbyteoff, int * pbitoff) ; |
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| 106 | |
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| 107 | |
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| 108 | /************************************************************************* |
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| 109 | * |
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| 110 | * FUNCTION: getnextbits |
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| 111 | * |
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| 112 | * Inputs: |
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| 113 | * pBuf - stream buffer |
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| 114 | * pbyteoff - current byte offset into pBuf |
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| 115 | * pbitoff - bit offset into current byte |
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| 116 | * numbits - number of bits to get (max 32) |
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| 117 | * |
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| 118 | * Outputs: |
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| 119 | * pbyteoff - current byte offset into pBuf |
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| 120 | * pbitoff - bit offset into current byte |
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| 121 | * |
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| 122 | * Returns: the requested bits, lsb justified |
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| 123 | * |
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| 124 | * Description: |
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| 125 | * |
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| 126 | * This function returns the requested number of bits and |
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| 127 | * updates the position. |
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| 128 | * |
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| 129 | *************************************************************************/ |
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| 130 | unsigned int |
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| 131 | getnextbits(unsigned char * pBuf, int * pbyteoff, int * pbitoff, int numbits) ; |
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| 132 | |
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| 133 | |
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| 134 | /************************************************************************* |
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| 135 | * |
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| 136 | * FUNCTION: getnextbits_rev |
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| 137 | * |
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| 138 | * Inputs: |
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| 139 | * pBuf - stream buffer |
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| 140 | * pbyteoff - current byte offset into pBuf |
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| 141 | * pbitoff - bit offset into current byte |
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| 142 | * numbits - number of bits to get (max 32) |
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| 143 | * |
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| 144 | * Outputs: |
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| 145 | * pbyteoff - current byte offset into pBuf |
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| 146 | * pbitoff - bit offset into current byte |
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| 147 | * |
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| 148 | * Returns: the requested bits, bit reversed, lsb justified |
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| 149 | * |
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| 150 | * Description: |
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| 151 | * |
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| 152 | * This function returns the requested number of bits in reverse |
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| 153 | * order and updates the position. |
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| 154 | * |
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| 155 | *************************************************************************/ |
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| 156 | unsigned int |
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| 157 | getnextbits_rev(unsigned char * pBuf, int * pbyteoff, int * pbitoff, int numbits) ; |
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| 158 | |
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| 159 | |
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| 160 | /************************************************************************* |
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| 161 | * |
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| 162 | * FUNCTION: nextbits |
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| 163 | * |
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| 164 | * Inputs: |
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| 165 | * pBuf - stream buffer |
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| 166 | * byteoff - current byte offset into pBuf |
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| 167 | * bitoff - bit offset into current byte |
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| 168 | * numbits - number of bits to get (max 32) |
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| 169 | * |
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| 170 | * Outputs: |
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| 171 | * <none> |
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| 172 | * |
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| 173 | * Returns: the requested bits, lsb justified |
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| 174 | * |
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| 175 | * Description: |
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| 176 | * |
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| 177 | * This function returns the requested number of bits but does |
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| 178 | * not update the position. |
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| 179 | * |
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| 180 | *************************************************************************/ |
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| 181 | unsigned int |
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| 182 | nextbits(unsigned char * pBuf, int byteoff, int bitoff, int numbits) ; |
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| 183 | |
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| 184 | |
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| 185 | /************************************************************************* |
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| 186 | * |
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| 187 | * FUNCTION: next_start_code |
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| 188 | * |
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| 189 | * Inputs: |
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| 190 | * pBuf - stream buffer |
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| 191 | * pbyteoff - current byte offset into pBuf |
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| 192 | * pbitoff - bit offset into current byte |
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| 193 | * numbytes - max bytes to scan forward |
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| 194 | * |
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| 195 | * Outputs: |
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| 196 | * pbyteoff - current byte offset into pBuf |
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| 197 | * pbitoff - bit offset into current byte |
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| 198 | * |
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| 199 | * Returns: 0 for success |
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| 200 | * |
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| 201 | * Description: |
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| 202 | * |
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| 203 | * This function updates the position to the next start code. |
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| 204 | * |
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| 205 | *************************************************************************/ |
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| 206 | int next_start_code(unsigned char * pBuf, int * pbyteoff, int * pbitoff, int numbytes) ; |
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| 207 | |
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| 208 | |
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| 209 | |
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| 210 | #ifdef __cplusplus |
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| 211 | } |
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| 212 | #endif |
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| 213 | |
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| 214 | #endif /* BCMDCCBITS_H */ |
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