| 1 | /* |
| 2 | * MJPEG encoder and decoder |
| 3 | * Copyright (c) 2000, 2001 Fabrice Bellard |
| 4 | * Copyright (c) 2003 Alex Beregszaszi |
| 5 | * Copyright (c) 2003-2004 Michael Niedermayer |
| 6 | * |
| 7 | * Support for external huffman table, various fixes (AVID workaround), |
| 8 | * aspecting, new decode_frame mechanism and apple mjpeg-b support |
| 9 | * by Alex Beregszaszi |
| 10 | * |
| 11 | * This file is part of FFmpeg. |
| 12 | * |
| 13 | * FFmpeg is free software; you can redistribute it and/or |
| 14 | * modify it under the terms of the GNU Lesser General Public |
| 15 | * License as published by the Free Software Foundation; either |
| 16 | * version 2.1 of the License, or (at your option) any later version. |
| 17 | * |
| 18 | * FFmpeg is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 21 | * Lesser General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU Lesser General Public |
| 24 | * License along with FFmpeg; if not, write to the Free Software |
| 25 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 26 | */ |
| 27 | |
| 28 | /** |
| 29 | * @file |
| 30 | * MJPEG encoder and decoder. |
| 31 | */ |
| 32 | |
| 33 | #include "mjpeg.h" |
| 34 | |
| 35 | |
| 36 | #if 0 |
| 37 | /* These are the sample quantization tables given in JPEG spec section K.1. |
| 38 | * The spec says that the values given produce "good" quality, and |
| 39 | * when divided by 2, "very good" quality. |
| 40 | */ |
| 41 | static const unsigned char std_luminance_quant_tbl[64] = { |
| 42 | 16, 11, 10, 16, 24, 40, 51, 61, |
| 43 | 12, 12, 14, 19, 26, 58, 60, 55, |
| 44 | 14, 13, 16, 24, 40, 57, 69, 56, |
| 45 | 14, 17, 22, 29, 51, 87, 80, 62, |
| 46 | 18, 22, 37, 56, 68, 109, 103, 77, |
| 47 | 24, 35, 55, 64, 81, 104, 113, 92, |
| 48 | 49, 64, 78, 87, 103, 121, 120, 101, |
| 49 | 72, 92, 95, 98, 112, 100, 103, 99 |
| 50 | }; |
| 51 | static const unsigned char std_chrominance_quant_tbl[64] = { |
| 52 | 17, 18, 24, 47, 99, 99, 99, 99, |
| 53 | 18, 21, 26, 66, 99, 99, 99, 99, |
| 54 | 24, 26, 56, 99, 99, 99, 99, 99, |
| 55 | 47, 66, 99, 99, 99, 99, 99, 99, |
| 56 | 99, 99, 99, 99, 99, 99, 99, 99, |
| 57 | 99, 99, 99, 99, 99, 99, 99, 99, |
| 58 | 99, 99, 99, 99, 99, 99, 99, 99, |
| 59 | 99, 99, 99, 99, 99, 99, 99, 99 |
| 60 | }; |
| 61 | #endif |
| 62 | |
| 63 | /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */ |
| 64 | /* IMPORTANT: these are only valid for 8-bit data precision! */ |
| 65 | const uint8_t avpriv_mjpeg_bits_dc_luminance[17] = |
| 66 | { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }; |
| 67 | const uint8_t avpriv_mjpeg_val_dc[12] = |
| 68 | { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; |
| 69 | |
| 70 | const uint8_t avpriv_mjpeg_bits_dc_chrominance[17] = |
| 71 | { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; |
| 72 | |
| 73 | const uint8_t avpriv_mjpeg_bits_ac_luminance[17] = |
| 74 | { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d }; |
| 75 | const uint8_t avpriv_mjpeg_val_ac_luminance[] = |
| 76 | { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, |
| 77 | 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, |
| 78 | 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, |
| 79 | 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, |
| 80 | 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, |
| 81 | 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, |
| 82 | 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, |
| 83 | 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, |
| 84 | 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, |
| 85 | 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, |
| 86 | 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, |
| 87 | 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, |
| 88 | 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, |
| 89 | 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, |
| 90 | 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, |
| 91 | 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, |
| 92 | 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, |
| 93 | 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, |
| 94 | 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, |
| 95 | 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, |
| 96 | 0xf9, 0xfa |
| 97 | }; |
| 98 | |
| 99 | const uint8_t avpriv_mjpeg_bits_ac_chrominance[17] = |
| 100 | { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 }; |
| 101 | |
| 102 | const uint8_t avpriv_mjpeg_val_ac_chrominance[] = |
| 103 | { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, |
| 104 | 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, |
| 105 | 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, |
| 106 | 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, |
| 107 | 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, |
| 108 | 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, |
| 109 | 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, |
| 110 | 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, |
| 111 | 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, |
| 112 | 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, |
| 113 | 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, |
| 114 | 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, |
| 115 | 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, |
| 116 | 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, |
| 117 | 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, |
| 118 | 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, |
| 119 | 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, |
| 120 | 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, |
| 121 | 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, |
| 122 | 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, |
| 123 | 0xf9, 0xfa |
| 124 | }; |
| 125 | |
| 126 | /* isn't this function nicer than the one in the libjpeg ? */ |
| 127 | void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code, |
| 128 | const uint8_t *bits_table, |
| 129 | const uint8_t *val_table) |
| 130 | { |
| 131 | int i, j, k,nb, code, sym; |
| 132 | |
| 133 | code = 0; |
| 134 | k = 0; |
| 135 | for(i=1;i<=16;i++) { |
| 136 | nb = bits_table[i]; |
| 137 | for(j=0;j<nb;j++) { |
| 138 | sym = val_table[k++]; |
| 139 | huff_size[sym] = i; |
| 140 | huff_code[sym] = code; |
| 141 | code++; |
| 142 | } |
| 143 | code <<= 1; |
| 144 | } |
| 145 | } |