Libav
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00001 /* 00002 * MJPEG encoder and decoder 00003 * Copyright (c) 2000, 2001 Fabrice Bellard 00004 * Copyright (c) 2003 Alex Beregszaszi 00005 * Copyright (c) 2003-2004 Michael Niedermayer 00006 * 00007 * Support for external huffman table, various fixes (AVID workaround), 00008 * aspecting, new decode_frame mechanism and apple mjpeg-b support 00009 * by Alex Beregszaszi 00010 * 00011 * This file is part of FFmpeg. 00012 * 00013 * FFmpeg is free software; you can redistribute it and/or 00014 * modify it under the terms of the GNU Lesser General Public 00015 * License as published by the Free Software Foundation; either 00016 * version 2.1 of the License, or (at your option) any later version. 00017 * 00018 * FFmpeg is distributed in the hope that it will be useful, 00019 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00020 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00021 * Lesser General Public License for more details. 00022 * 00023 * You should have received a copy of the GNU Lesser General Public 00024 * License along with FFmpeg; if not, write to the Free Software 00025 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00026 */ 00027 00033 #include "mjpeg.h" 00034 00035 00036 #if 0 00037 /* These are the sample quantization tables given in JPEG spec section K.1. 00038 * The spec says that the values given produce "good" quality, and 00039 * when divided by 2, "very good" quality. 00040 */ 00041 const unsigned char std_luminance_quant_tbl[64] = { 00042 16, 11, 10, 16, 24, 40, 51, 61, 00043 12, 12, 14, 19, 26, 58, 60, 55, 00044 14, 13, 16, 24, 40, 57, 69, 56, 00045 14, 17, 22, 29, 51, 87, 80, 62, 00046 18, 22, 37, 56, 68, 109, 103, 77, 00047 24, 35, 55, 64, 81, 104, 113, 92, 00048 49, 64, 78, 87, 103, 121, 120, 101, 00049 72, 92, 95, 98, 112, 100, 103, 99 00050 }; 00051 const unsigned char std_chrominance_quant_tbl[64] = { 00052 17, 18, 24, 47, 99, 99, 99, 99, 00053 18, 21, 26, 66, 99, 99, 99, 99, 00054 24, 26, 56, 99, 99, 99, 99, 99, 00055 47, 66, 99, 99, 99, 99, 99, 99, 00056 99, 99, 99, 99, 99, 99, 99, 99, 00057 99, 99, 99, 99, 99, 99, 99, 99, 00058 99, 99, 99, 99, 99, 99, 99, 99, 00059 99, 99, 99, 99, 99, 99, 99, 99 00060 }; 00061 #endif 00062 00063 /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */ 00064 /* IMPORTANT: these are only valid for 8-bit data precision! */ 00065 const uint8_t ff_mjpeg_bits_dc_luminance[17] = 00066 { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }; 00067 const uint8_t ff_mjpeg_val_dc[12] = 00068 { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; 00069 00070 const uint8_t ff_mjpeg_bits_dc_chrominance[17] = 00071 { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; 00072 00073 const uint8_t ff_mjpeg_bits_ac_luminance[17] = 00074 { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d }; 00075 const uint8_t ff_mjpeg_val_ac_luminance[] = 00076 { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, 00077 0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, 00078 0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, 00079 0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, 00080 0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, 00081 0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, 00082 0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 00083 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 00084 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 00085 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 00086 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 00087 0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 00088 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 00089 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 00090 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 00091 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, 00092 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, 00093 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, 00094 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 00095 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 00096 0xf9, 0xfa 00097 }; 00098 00099 const uint8_t ff_mjpeg_bits_ac_chrominance[17] = 00100 { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 }; 00101 00102 const uint8_t ff_mjpeg_val_ac_chrominance[] = 00103 { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, 00104 0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, 00105 0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, 00106 0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, 00107 0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, 00108 0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, 00109 0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, 00110 0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 00111 0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 00112 0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 00113 0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 00114 0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 00115 0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 00116 0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 00117 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 00118 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 00119 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 00120 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 00121 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 00122 0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 00123 0xf9, 0xfa 00124 }; 00125 00126 /* isn't this function nicer than the one in the libjpeg ? */ 00127 void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code, 00128 const uint8_t *bits_table, 00129 const uint8_t *val_table) 00130 { 00131 int i, j, k,nb, code, sym; 00132 00133 code = 0; 00134 k = 0; 00135 for(i=1;i<=16;i++) { 00136 nb = bits_table[i]; 00137 for(j=0;j<nb;j++) { 00138 sym = val_table[k++]; 00139 huff_size[sym] = i; 00140 huff_code[sym] = code; 00141 code++; 00142 } 00143 code <<= 1; 00144 } 00145 }