GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/jpegtables.c Lines: 14 14 100.0 %
Date: 2019-11-22 03:34:36 Branches: 7 8 87.5 %

Line Branch Exec Source
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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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19585
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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    for(i=1;i<=16;i++) {
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        nb = bits_table[i];
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        for(j=0;j<nb;j++) {
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            sym = val_table[k++];
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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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19585
}