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Revision 1.1.1.1 - (view) (download)
| 1 : | Isibaar | 1.1 | /************************************************************************** |
| 2 : | * | ||
| 3 : | * XVID MPEG-4 VIDEO CODEC | ||
| 4 : | * 8bit<->16bit transfer | ||
| 5 : | * | ||
| 6 : | * This program is an implementation of a part of one or more MPEG-4 | ||
| 7 : | * Video tools as specified in ISO/IEC 14496-2 standard. Those intending | ||
| 8 : | * to use this software module in hardware or software products are | ||
| 9 : | * advised that its use may infringe existing patents or copyrights, and | ||
| 10 : | * any such use would be at such party's own risk. The original | ||
| 11 : | * developer of this software module and his/her company, and subsequent | ||
| 12 : | * editors and their companies, will have no liability for use of this | ||
| 13 : | * software or modifications or derivatives thereof. | ||
| 14 : | * | ||
| 15 : | * This program is free software; you can redistribute it and/or modify | ||
| 16 : | * it under the terms of the GNU General Public License as published by | ||
| 17 : | * the Free Software Foundation; either version 2 of the License, or | ||
| 18 : | * (at your option) any later version. | ||
| 19 : | * | ||
| 20 : | * This program is distributed in the hope that it will be useful, | ||
| 21 : | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 22 : | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| 23 : | * GNU General Public License for more details. | ||
| 24 : | * | ||
| 25 : | * You should have received a copy of the GNU General Public License | ||
| 26 : | * along with this program; if not, write to the Free Software | ||
| 27 : | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
| 28 : | * | ||
| 29 : | *************************************************************************/ | ||
| 30 : | |||
| 31 : | /************************************************************************** | ||
| 32 : | * | ||
| 33 : | * History: | ||
| 34 : | * | ||
| 35 : | * 07.01.2002 merge functions from compensate; rename functions | ||
| 36 : | * 22.12.2001 transfer_8to8add16 limit fix | ||
| 37 : | * 07.11.2001 initial version; (c)2001 peter ross <pross@cs.rmit.edu.au> | ||
| 38 : | |||
| 39 : | *************************************************************************/ | ||
| 40 : | |||
| 41 : | TRANSFER_8TO16SUB_PTR transfer_8to16sub; | ||
| 42 : | TRANSFER_8TO16SUB2_PTR transfer_8to16sub2; | ||
| 43 : | TRANSFER_16TO8ADD_PTR transfer_16to8add; | ||
| 44 : | |||
| 45 : | // function pointers | ||
| 46 : | TRANSFER_8TO16COPY_PTR transfer_8to16copy; | ||
| 47 : | TRANSFER_16TO8COPY_PTR transfer_16to8copy; | ||
| 48 : | * | ||
| 49 : | TRANSFER_8TO16SUB_PTR transfer_8to16sub; | ||
| 50 : | TRANSFER_16TO8ADD_PTR transfer_16to8add; | ||
| 51 : | * This is typically used during motion compensation, that's why some | ||
| 52 : | TRANSFER8X8_COPY_PTR transfer8x8_copy; | ||
| 53 : | * so called transfer. | ||
| 54 : | * | ||
| 55 : | */ | ||
| 56 : | void transfer_8to16copy_c(int16_t * const dst, | ||
| 57 : | const uint8_t * const src, | ||
| 58 : | uint32_t stride) | ||
| 59 : | |||
| 60 : | /* | ||
| 61 : | * SRC - the source buffer | ||
| 62 : | * DST - the destination buffer | ||
| 63 : | * | ||
| 64 : | dst[j * 8 + i] = (int16_t)src[j * stride + i]; | ||
| 65 : | * | ||
| 66 : | * SRC (16bit) = SRC | ||
| 67 : | * DST (8bit) = max(min(SRC, 255), 0) | ||
| 68 : | */ | ||
| 69 : | |||
| 70 : | void transfer_16to8copy_c(uint8_t * const dst, | ||
| 71 : | const int16_t * const src, | ||
| 72 : | uint32_t stride) | ||
| 73 : | } else if (pixel > 255) { | ||
| 74 : | pixel = 255; | ||
| 75 : | } | ||
| 76 : | dst[j * stride + i] = (uint8_t) pixel; | ||
| 77 : | } | ||
| 78 : | } | ||
| 79 : | |||
| 80 : | |||
| 81 : | |||
| 82 : | |||
| 83 : | } | ||
| 84 : | dst[j * stride + i] = (uint8_t)pixel; | ||
| 85 : | * R - the reference buffer | ||
| 86 : | * DCT - the dct coefficient buffer | ||
| 87 : | * | ||
| 88 : | * Then the function does the 8->16 bit transfer and this serie of operations : | ||
| 89 : | * | ||
| 90 : | * R (8bit) = R | ||
| 91 : | * C (8bit) = R | ||
| 92 : | * DCT (16bit) = C - R | ||
| 93 : | perform motion compensation (and 8bit->16bit dct transfer) | ||
| 94 : | */ | ||
| 95 : | void transfer_8to16sub_c(int16_t * const dct, | ||
| 96 : | uint8_t * const cur, | ||
| 97 : | const uint8_t * ref, | ||
| 98 : | const uint32_t stride) | ||
| 99 : | dct[j * 8 + i] = (int16_t) c - (int16_t) r; | ||
| 100 : | } | ||
| 101 : | } | ||
| 102 : | for (j = 0; j < 8; j++) | ||
| 103 : | { | ||
| 104 : | for (i = 0; i < 8; i++) | ||
| 105 : | { | ||
| 106 : | |||
| 107 : | /* | ||
| 108 : | * R1 - the 1st reference buffer | ||
| 109 : | dct[j * 8 + i] = (int16_t)c - (int16_t)r; | ||
| 110 : | * Then the function does the 16->8 bit transfer and this serie of operations : | ||
| 111 : | * | ||
| 112 : | * SRC (16bit) = SRC | ||
| 113 : | * DST (8bit) = max(min(DST+SRC, 255), 0) | ||
| 114 : | */ | ||
| 115 : | void transfer_16to8add_c(uint8_t * const dst, | ||
| 116 : | if (pixel < 0) { | ||
| 117 : | pixel = 0; | ||
| 118 : | } else if (pixel > 255) { | ||
| 119 : | pixel = 255; | ||
| 120 : | } | ||
| 121 : | dst[j * stride + i] = (uint8_t) pixel; | ||
| 122 : | } | ||
| 123 : | int16_t pixel = (int16_t)dst[j * stride + i] + src[j * 8 + i]; | ||
| 124 : | |||
| 125 : | /* | ||
| 126 : | * SRC - the source buffer | ||
| 127 : | * DST - the destination buffer | ||
| 128 : | } | ||
| 129 : | dst[j * stride + i] = (uint8_t)pixel; | ||
| 130 : | * | ||
| 131 : | * SRC (8bit) = SRC | ||
| 132 : | * DST (8bit) = SRC | ||
| 133 : | */ | ||
| 134 : | |||
| 135 : | |||
| 136 : | |||
| 137 : | void transfer8x8_copy_c(uint8_t * const dst, | ||
| 138 : | const uint8_t * const src, | ||
| 139 : | const uint32_t stride) | ||
| 140 : |
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