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/* |
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* MJPEG encoder and decoder |
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* Copyright (c) 2000, 2001 Fabrice Bellard |
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* Copyright (c) 2003 Alex Beregszaszi |
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* Copyright (c) 2003-2004 Michael Niedermayer |
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* |
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* Support for external huffman table, various fixes (AVID workaround), |
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* aspecting, new decode_frame mechanism and apple mjpeg-b support |
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* by Alex Beregszaszi |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/** |
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* @file |
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* MJPEG encoder and decoder. |
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*/ |
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#include "jpegtables.h" |
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#if 0 |
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/* These are the sample quantization tables given in JPEG spec section K.1. |
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* The spec says that the values given produce "good" quality, and |
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* when divided by 2, "very good" quality. |
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*/ |
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static const unsigned char std_luminance_quant_tbl[64] = { |
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16, 11, 10, 16, 24, 40, 51, 61, |
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12, 12, 14, 19, 26, 58, 60, 55, |
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14, 13, 16, 24, 40, 57, 69, 56, |
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14, 17, 22, 29, 51, 87, 80, 62, |
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18, 22, 37, 56, 68, 109, 103, 77, |
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24, 35, 55, 64, 81, 104, 113, 92, |
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49, 64, 78, 87, 103, 121, 120, 101, |
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72, 92, 95, 98, 112, 100, 103, 99 |
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}; |
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static const unsigned char std_chrominance_quant_tbl[64] = { |
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17, 18, 24, 47, 99, 99, 99, 99, |
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18, 21, 26, 66, 99, 99, 99, 99, |
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24, 26, 56, 99, 99, 99, 99, 99, |
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47, 66, 99, 99, 99, 99, 99, 99, |
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99, 99, 99, 99, 99, 99, 99, 99, |
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99, 99, 99, 99, 99, 99, 99, 99, |
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99, 99, 99, 99, 99, 99, 99, 99, |
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99, 99, 99, 99, 99, 99, 99, 99 |
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}; |
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#endif |
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/* Set up the standard Huffman tables (cf. JPEG standard section K.3) */ |
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/* IMPORTANT: these are only valid for 8-bit data precision! */ |
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const uint8_t avpriv_mjpeg_bits_dc_luminance[17] = |
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{ /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 }; |
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const uint8_t avpriv_mjpeg_val_dc[12] = |
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{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 }; |
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const uint8_t avpriv_mjpeg_bits_dc_chrominance[17] = |
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{ /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 }; |
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const uint8_t avpriv_mjpeg_bits_ac_luminance[17] = |
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{ /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d }; |
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const uint8_t avpriv_mjpeg_val_ac_luminance[] = |
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{ 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12, |
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0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07, |
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0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08, |
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0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0, |
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0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16, |
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0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28, |
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0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, |
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0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, |
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0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, |
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0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, |
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0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, |
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0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, |
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0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, |
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0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, |
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0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, |
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0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5, |
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0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4, |
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0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2, |
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0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, |
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0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, |
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0xf9, 0xfa |
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}; |
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const uint8_t avpriv_mjpeg_bits_ac_chrominance[17] = |
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{ /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 }; |
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const uint8_t avpriv_mjpeg_val_ac_chrominance[] = |
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{ 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21, |
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0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71, |
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0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91, |
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0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0, |
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0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34, |
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0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26, |
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0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38, |
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0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, |
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0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, |
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0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, |
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0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, |
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0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, |
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0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, |
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0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, |
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0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, |
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0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, |
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0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, |
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0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, |
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0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, |
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0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, |
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0xf9, 0xfa |
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}; |
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/* isn't this function nicer than the one in the libjpeg ? */ |
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void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code, |
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const uint8_t *bits_table, |
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const uint8_t *val_table) |
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{ |
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int i, j, k,nb, code, sym; |
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/* Some badly encoded files [1] map 2 different codes to symbol 0. |
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Only the first one is valid, so we zero-initialize this here and |
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make sure we only set it once (the first time) in the loop below. |
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[1]: Embedded JPEGs in "X7 RAW" and "X7 CinemaDNG" samples here: |
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https://www.dji.com/gr/zenmuse-x7/info#downloads |
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*/ |
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huff_size[0] = 0; |
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k = 0; |
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code = 0; |
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✓✓ |
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for(i=1;i<=16;i++) { |
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nb = bits_table[i]; |
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✓✓ |
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for(j=0;j<nb;j++) { |
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sym = val_table[k++]; |
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✓✓✓✗
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if (sym != 0 || huff_size[sym] == 0) { /* see comment above */ |
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huff_size[sym] = i; |
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huff_code[sym] = code; |
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} |
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code++; |
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} |
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code <<= 1; |
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} |
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} |