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jpegencoder.c
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/* JPEG Encoder Library
* Copyright (c) 2006-2016 SIProp.org Noritsuna Imamura([email protected])
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include "jpegencoder.h"
#define BLOCK_SIZE JPEG4C_BLOCK_SIZE
#define QUANT_SIZE JPEG4C_BLOCK_SIZE*JPEG4C_BLOCK_SIZE
/**
ISO/IEC 10918 ITU-T Recommendation T.81 Appendix:K
*/
/**
* zigzag table.
*/
static const int zigzag_tbl[] = {
0,1,8,16,9,2,3,10,
17,24,32,25,18,11,4,5,
12,19,26,33,40,48,41,34,
27,20,13,6,7,14,21,28,
35,42,49,56,57,50,43,36,
29,22,15,23,30,37,44,51,
58,59,52,45,38,31,39,46,
53,60,61,54,47,55,62,63
};
/**
* Standard quantization table For luminance (sorted by zigzag_tbl).
* Quality rate is "0".
*/
static const uint8_t std_luminance_quant_tbl_0[] = {
0x20, 0x16, 0x18, 0x1C, 0x18, 0x14, 0x20, 0x1C,
0x1A, 0x1C, 0x24, 0x22, 0x20, 0x26, 0x30, 0x50,
0x34, 0x30, 0x2C, 0x2C, 0x30, 0x62, 0x46, 0x4A,
0x3A, 0x50, 0x74, 0x66, 0x7A, 0x78, 0x72, 0x66,
0x70, 0x6E, 0x80, 0x90, 0xB8, 0x9C, 0x80, 0x88,
0xAE, 0x8A, 0x6E, 0x70, 0xA0, 0xDA, 0xA2, 0xAE,
0xBE, 0xC4, 0xCE, 0xD0, 0xCE, 0x7C, 0x9A, 0xE2,
0xF2, 0xE0, 0xC8, 0xF0, 0xB8, 0xCA, 0xCE, 0xC6
};
/**
* Standard quantization table For luminance (sorted by zigzag_tbl).
* Quality rate is "10".
*/
static const uint8_t std_luminance_quant_tbl_10[] = {
0x10, 0x0B, 0x0C, 0x0E, 0x0C, 0x0A, 0x10, 0x0E,
0x0D, 0x0E, 0x12, 0x11, 0x10, 0x13, 0x18, 0x28,
0x1A, 0x18, 0x16, 0x16, 0x18, 0x31, 0x23, 0x25,
0x1D, 0x28, 0x3A, 0x33, 0x3D, 0x3C, 0x39, 0x33,
0x38, 0x37, 0x40, 0x48, 0x5C, 0x4E, 0x40, 0x44,
0x57, 0x45, 0x37, 0x38, 0x50, 0x6D, 0x51, 0x57,
0x5F, 0x62, 0x67, 0x68, 0x67, 0x3E, 0x4D, 0x71,
0x79, 0x70, 0x64, 0x78, 0x5C, 0x65, 0x67, 0x63
};
/**
* Standard quantization table For luminance (sorted by zigzag_tbl).
* Quality rate is "20".
*/
static const uint8_t std_luminance_quant_tbl_20[] = {
0x0C, 0x08, 0x09, 0x0B, 0x09, 0x08, 0x0C, 0x0B,
0x0A, 0x0B, 0x0E, 0x0D, 0x0C, 0x0F, 0x13, 0x20,
0x14, 0x13, 0x11, 0x11, 0x13, 0x27, 0x1C, 0x1D,
0x17, 0x20, 0x2E, 0x28, 0x30, 0x30, 0x2D, 0x28,
0x2C, 0x2C, 0x33, 0x39, 0x49, 0x3E, 0x33, 0x36,
0x45, 0x37, 0x2C, 0x2C, 0x40, 0x57, 0x40, 0x45,
0x4C, 0x4E, 0x52, 0x53, 0x52, 0x31, 0x3D, 0x5A,
0x60, 0x59, 0x50, 0x60, 0x49, 0x50, 0x52, 0x4F
};
/**
* Standard quantization table For luminance (sorted by zigzag_tbl).
* Quality rate is "50".
*/
static const uint8_t std_luminance_quant_tbl_50[] = {
0x08, 0x05, 0x06, 0x07, 0x06, 0x05, 0x08, 0x07,
0x06, 0x07, 0x09, 0x08, 0x08, 0x09, 0x0C, 0x14,
0x0D, 0x0C, 0x0B, 0x0B, 0x0C, 0x18, 0x11, 0x12,
0x0E, 0x14, 0x1D, 0x19, 0x1E, 0x1E, 0x1C, 0x19,
0x1C, 0x1B, 0x20, 0x24, 0x2E, 0x27, 0x20, 0x22,
0x2B, 0x22, 0x1B, 0x1C, 0x28, 0x36, 0x28, 0x2B,
0x2F, 0x31, 0x33, 0x34, 0x33, 0x1F, 0x26, 0x38,
0x3C, 0x38, 0x32, 0x3C, 0x2E, 0x32, 0x33, 0x31
};
/**
* Standard quantization table For luminance (sorted by zigzag_tbl).
* Quality rate is "90".
*/
static const uint8_t std_luminance_quant_tbl_90_2x[] = {
2*0x01, 2*0x01, 2*0x01, 2*0x01, 2*0x01, 2*0x01, 2*0x01, 2*0x01,
2*0x01, 2*0x01, 2*0x01, 2*0x01, 2*0x01, 2*0x01, 2*0x02, 2*0x04,
2*0x02, 2*0x02, 2*0x02, 2*0x02, 2*0x02, 2*0x04, 2*0x03, 2*0x03,
2*0x02, 2*0x04, 2*0x05, 2*0x05, 2*0x06, 2*0x06, 2*0x05, 2*0x05,
2*0x05, 2*0x05, 2*0x06, 2*0x07, 2*0x09, 2*0x07, 2*0x06, 2*0x06,
2*0x08, 2*0x06, 2*0x05, 2*0x05, 2*0x08, 2*0x0A, 2*0x08, 2*0x08,
2*0x09, 2*0x09, 2*0x0A, 2*0x0A, 2*0x0A, 2*0x06, 2*0x07, 2*0x0B,
2*0x0C, 2*0x0B, 2*0x0A, 2*0x0C, 2*0x09, 2*0x0A, 2*0x0A, 2*0x09
};
/**
* Standard quantization table For luminance (sorted by zigzag_tbl).
* Quality rate is "90".
*/
static const uint8_t std_luminance_quant_tbl_90[] = {
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x04,
0x02, 0x02, 0x02, 0x02, 0x02, 0x04, 0x03, 0x03,
0x02, 0x04, 0x05, 0x05, 0x06, 0x06, 0x05, 0x05,
0x05, 0x05, 0x06, 0x07, 0x09, 0x07, 0x06, 0x06,
0x08, 0x06, 0x05, 0x05, 0x08, 0x0A, 0x08, 0x08,
0x09, 0x09, 0x0A, 0x0A, 0x0A, 0x06, 0x07, 0x0B,
0x0C, 0x0B, 0x0A, 0x0C, 0x09, 0x0A, 0x0A, 0x09
};
/**
* Standard quantization table For luminance (sorted by zigzag_tbl).
* Quality rate is "95".
*/
static const uint8_t std_luminance_quant_tbl_95[] = {
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02,
0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01, 0x01,
0x01, 0x02, 0x02, 0x02, 0x03, 0x03, 0x02, 0x02,
0x02, 0x02, 0x03, 0x03, 0x04, 0x03, 0x03, 0x03,
0x04, 0x03, 0x02, 0x02, 0x04, 0x05, 0x04, 0x04,
0x04, 0x04, 0x05, 0x05, 0x05, 0x03, 0x03, 0x05,
0x06, 0x05, 0x05, 0x06, 0x04, 0x05, 0x05, 0x04
};
/**
* Standard quantization table For luminance (sorted by zigzag_tbl).
* Quality rate is "100".
*/
static const uint8_t std_luminance_quant_tbl_100[] = {
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01
};
/**
* Standard quantization table For chrominance (sorted by zigzag_tbl).
* Quality rate is "0".
*/
static const uint8_t std_chrominance_quant_tbl_0[] = {
0x22, 0x24, 0x24, 0x30, 0x2A, 0x30, 0x5E, 0x34,
0x34, 0x5E, 0xC6, 0x84, 0x70, 0x84, 0xC6, 0xC6,
0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6,
0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6,
0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6,
0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6,
0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6,
0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6, 0xC6
};
/**
* Standard quantization table For chrominance (sorted by zigzag_tbl).
* Quality rate is "10".
*/
static const uint8_t std_chrominance_quant_tbl_10[] = {
0x11, 0x12, 0x12, 0x18, 0x15, 0x18, 0x2F, 0x1A,
0x1A, 0x2F, 0x63, 0x42, 0x38, 0x42, 0x63, 0x63,
0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63,
0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63, 0x63
};
/**
* Standard quantization table For chrominance (sorted by zigzag_tbl).
* Quality rate is "20".
*/
static const uint8_t std_chrominance_quant_tbl_20[] = {
0x0D, 0x0E, 0x0E, 0x13, 0x10, 0x13, 0x25, 0x14,
0x14, 0x25, 0x4F, 0x34, 0x2C, 0x34, 0x4F, 0x4F,
0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F,
0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F,
0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F,
0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F,
0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F,
0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F, 0x4F
};
/**
* Standard quantization table For chrominance (sorted by zigzag_tbl).
* Quality rate is "50".
*/
static const uint8_t std_chrominance_quant_tbl_50[] = {
0x08, 0x09, 0x09, 0x0C, 0x0A, 0x0C, 0x17, 0x0D,
0x0D, 0x17, 0x31, 0x21, 0x1C, 0x21, 0x31, 0x31,
0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31,
0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31, 0x31
};
/**
* Standard quantization table For chrominance (sorted by zigzag_tbl).
* Quality rate is "90".
*/
static const uint8_t std_chrominance_quant_tbl_90[] = {
0x01, 0x01, 0x01, 0x02, 0x02, 0x02, 0x04, 0x02,
0x02, 0x04, 0x09, 0x06, 0x05, 0x06, 0x09, 0x09,
0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09,
0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09,
0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09,
0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09,
0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09,
0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09, 0x09
};
/**
* Standard quantization table For chrominance (sorted by zigzag_tbl).
* Quality rate is "95".
*/
static const uint8_t std_chrominance_quant_tbl_95[] = {
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x02, 0x01,
0x01, 0x02, 0x04, 0x03, 0x02, 0x03, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04,
0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04, 0x04
};
/**
* Standard quantization table For chrominance (sorted by zigzag_tbl).
* Quality rate is "100".
*/
static const uint8_t std_chrominance_quant_tbl_100[] = {
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01
};
/**
* Standard Huffman code table For DC luminance.
*/
static const uint8_t std_dc_luminance_huff_val_tbl[] = {
0x00, 0x01, 0x05, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0A, 0x0B
};
/**
* Standard Huffman code's length table For DC luminance.
*/
static const uint8_t std_dc_luminance_huff_len_tbl[] = {
2,3,3,3,3,3,4,5,6,7,8,9
};
/**
* Calculated Huffman code table For DC luminance.
*/
static const int16_t std_dc_luminance_huff_code_tbl[] = {
0x0000, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x000e, 0x001e,
0x003e, 0x007e, 0x00fe, 0x01fe
};
/**
* Standard Huffman code table For AC luminance.
*/
static const uint8_t std_ac_luminance_huff_val_tbl[] = {
0x00, 0x02, 0x01, 0x03, 0x03, 0x02, 0x04, 0x03,
0x05, 0x05, 0x04, 0x04, 0x00, 0x00, 0x01, 0x7D,
0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xA1, 0x08,
0x23, 0x42, 0xB1, 0xC1, 0x15, 0x52, 0xD1, 0xF0,
0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0A, 0x16,
0x17, 0x18, 0x19, 0x1A, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2A, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
0x7A, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
0x8A, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6,
0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3, 0xC4, 0xC5,
0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2, 0xD3, 0xD4,
0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA, 0xE1, 0xE2,
0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9, 0xEA,
0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
0xF9, 0xFA
};
/**
* Standard Huffman code's length table For AC luminance.
*/
static const uint8_t std_ac_luminance_huff_len_tbl[] = {
4, 2, 2, 3, 4, 5, 7, 8,
10,16,16, 4, 5, 7, 9,11,
16,16,16,16,16, 5, 8,10,
12,16,16,16,16,16,16, 6,
9,12,16,16,16,16,16,16,
16, 6,10,16,16,16,16,16,
16,16,16, 7,11,16,16,16,
16,16,16,16,16, 7,12,16,
16,16,16,16,16,16,16, 8,
12,16,16,16,16,16,16,16,
16, 9,15,16,16,16,16,16,
16,16,16, 9,16,16,16,16,
16,16,16,16,16, 9,16,16,
16,16,16,16,16,16,16,10,
16,16,16,16,16,16,16,16,
16,10,16,16,16,16,16,16,
16,16,16,11,16,16,16,16,
16,16,16,16,16,16,16,16,
16,16,16,16,16,16,16,11,
16,16,16,16,16,16,16,16,
16,16
};
/**
* Calculated Huffman code table For AC luminance.
*/
static const int16_t std_ac_luminance_huff_code_tbl[] = {
0x000a, 0x0000, 0x0001, 0x0004, 0x000b, 0x001a, 0x0078, 0x00f8,
0x03f6, 0xff82, 0xff83, 0x000c, 0x001b, 0x0079, 0x01f6, 0x07f6,
0xff84, 0xff85, 0xff86, 0xff87, 0xff88, 0x001c, 0x00f9, 0x03f7,
0x0ff4, 0xff89, 0xff8a, 0xff8b, 0xff8c, 0xff8d, 0xff8e, 0x003a,
0x01f7, 0x0ff5, 0xff8f, 0xff90, 0xff91, 0xff92, 0xff93, 0xff94,
0xff95, 0x003b, 0x03f8, 0xff96, 0xff97, 0xff98, 0xff99, 0xff9a,
0xff9b, 0xff9c, 0xff9d, 0x007a, 0x07f7, 0xff9e, 0xff9f, 0xffa0,
0xffa1, 0xffa2, 0xffa3, 0xffa4, 0xffa5, 0x007b, 0x0ff6, 0xffa6,
0xffa7, 0xffa8, 0xffa9, 0xffaa, 0xffab, 0xffac, 0xffad, 0x00fa,
0x0ff7, 0xffae, 0xffaf, 0xffb0, 0xffb1, 0xffb2, 0xffb3, 0xffb4,
0xffb5, 0x01f8, 0x7fc0, 0xffb6, 0xffb7, 0xffb8, 0xffb9, 0xffba,
0xffbb, 0xffbc, 0xffbd, 0x01f9, 0xffbe, 0xffbf, 0xffc0, 0xffc1,
0xffc2, 0xffc3, 0xffc4, 0xffc5, 0xffc6, 0x01fa, 0xffc7, 0xffc8,
0xffc9, 0xffca, 0xffcb, 0xffcc, 0xffcd, 0xffce, 0xffcf, 0x03f9,
0xffd0, 0xffd1, 0xffd2, 0xffd3, 0xffd4, 0xffd5, 0xffd6, 0xffd7,
0xffd8, 0x03fa, 0xffd9, 0xffda, 0xffdb, 0xffdc, 0xffdd, 0xffde,
0xffdf, 0xffe0, 0xffe1, 0x07f8, 0xffe2, 0xffe3, 0xffe4, 0xffe5,
0xffe6, 0xffe7, 0xffe8, 0xffe9, 0xffea, 0xffeb, 0xffec, 0xffed,
0xffee, 0xffef, 0xfff0, 0xfff1, 0xfff2, 0xfff3, 0xfff4, 0x07f9,
0xfff5, 0xfff6, 0xfff7, 0xfff8, 0xfff9, 0xfffa, 0xfffb, 0xfffc,
0xfffd, 0xfffe
};
/**
* Standard Huffman code table For DC chrominance.
*/
static const uint8_t std_dc_chrominance_huff_val_tbl[] = {
0x00, 0x03, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0A, 0x0B
};
/**
* Standard Huffman code's length table For DC chrominance.
*/
static const uint8_t std_dc_chrominance_huff_len_tbl[] = {
2,2,2,3,4,5,6,7,8,9,10,11
};
/**
* Calculated Huffman code table For DC chrominance.
*/
static const int16_t std_dc_chrominance_huff_code_tbl[] = {
0x0000, 0x0001, 0x0002, 0x0006, 0x000e, 0x001e, 0x003e, 0x007e,
0x00fe, 0x01fe, 0x03fe, 0x07fe
};
/**
* Standard Huffman code table For AC chrominance.
*/
static const uint8_t std_ac_chrominance_huff_val_tbl[] = {
0x00, 0x02, 0x01, 0x02, 0x04, 0x04, 0x03, 0x04,
0x07, 0x05, 0x04, 0x04, 0x00, 0x01, 0x02, 0x77,
0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
0xA1, 0xB1, 0xC1, 0x09, 0x23, 0x33, 0x52, 0xF0,
0x15, 0x62, 0x72, 0xD1, 0x0A, 0x16, 0x24, 0x34,
0xE1, 0x25, 0xF1, 0x17, 0x18, 0x19, 0x1A, 0x26,
0x27, 0x28, 0x29, 0x2A, 0x35, 0x36, 0x37, 0x38,
0x39, 0x3A, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
0x49, 0x4A, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
0x59, 0x5A, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
0x69, 0x6A, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
0x79, 0x7A, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
0x88, 0x89, 0x8A, 0x92, 0x93, 0x94, 0x95, 0x96,
0x97, 0x98, 0x99, 0x9A, 0xA2, 0xA3, 0xA4, 0xA5,
0xA6, 0xA7, 0xA8, 0xA9, 0xAA, 0xB2, 0xB3, 0xB4,
0xB5, 0xB6, 0xB7, 0xB8, 0xB9, 0xBA, 0xC2, 0xC3,
0xC4, 0xC5, 0xC6, 0xC7, 0xC8, 0xC9, 0xCA, 0xD2,
0xD3, 0xD4, 0xD5, 0xD6, 0xD7, 0xD8, 0xD9, 0xDA,
0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7, 0xE8, 0xE9,
0xEA, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7, 0xF8,
0xF9, 0xFA
};
/**
* Standard Huffman code's length table For AC chrominance.
*/
static const uint8_t std_ac_chrominance_huff_len_tbl[] = {
2, 2, 3, 4, 5, 5, 6, 7,
9,10,12, 4, 6, 8, 9,11,
12,16,16,16,16, 5, 8,10,
12,15,16,16,16,16,16, 5,
8,10,12,16,16,16,16,16,
16, 6, 9,16,16,16,16,16,
16,16,16, 6,10,16,16,16,
16,16,16,16,16, 7,11,16,
16,16,16,16,16,16,16, 7,
11,16,16,16,16,16,16,16,
16, 8,16,16,16,16,16,16,
16,16,16, 9,16,16,16,16,
16,16,16,16,16, 9,16,16,
16,16,16,16,16,16,16, 9,
16,16,16,16,16,16,16,16,
16, 9,16,16,16,16,16,16,
16,16,16,11,16,16,16,16,
16,16,16,16,16,14,16,16,
16,16,16,16,16,16,16,10,
15,16,16,16,16,16,16,16,
16,16
};
/**
* Calculated Huffman code table For AC chrominance.
*/
static const int16_t std_ac_chrominance_huff_code_tbl[] = {
0x0000, 0x0001, 0x0004, 0x000a, 0x0018, 0x0019, 0x0038, 0x0078,
0x01f4, 0x03f6, 0x0ff4, 0x000b, 0x0039, 0x00f6, 0x01f5, 0x07f6,
0x0ff5, 0xff88, 0xff89, 0xff8a, 0xff8b, 0x001a, 0x00f7, 0x03f7,
0x0ff6, 0x7fc2, 0xff8c, 0xff8d, 0xff8e, 0xff8f, 0xff90, 0x001b,
0x00f8, 0x03f8, 0x0ff7, 0xff91, 0xff92, 0xff93, 0xff94, 0xff95,
0xff96, 0x003a, 0x01f6, 0xff97, 0xff98, 0xff99, 0xff9a, 0xff9b,
0xff9c, 0xff9d, 0xff9e, 0x003b, 0x03f9, 0xff9f, 0xffa0, 0xffa1,
0xffa2, 0xffa3, 0xffa4, 0xffa5, 0xffa6, 0x0079, 0x07f7, 0xffa7,
0xffa8, 0xffa9, 0xffaa, 0xffab, 0xffac, 0xffad, 0xffae, 0x007a,
0x07f8, 0xffaf, 0xffb0, 0xffb1, 0xffb2, 0xffb3, 0xffb4, 0xffb5,
0xffb6, 0x00f9, 0xffb7, 0xffb8, 0xffb9, 0xffba, 0xffbb, 0xffbc,
0xffbd, 0xffbe, 0xffbf, 0x01f7, 0xffc0, 0xffc1, 0xffc2, 0xffc3,
0xffc4, 0xffc5, 0xffc6, 0xffc7, 0xffc8, 0x01f8, 0xffc9, 0xffca,
0xffcb, 0xffcc, 0xffcd, 0xffce, 0xffcf, 0xffd0, 0xffd1, 0x01f9,
0xffd2, 0xffd3, 0xffd4, 0xffd5, 0xffd6, 0xffd7, 0xffd8, 0xffd9,
0xffda, 0x01fa, 0xffdb, 0xffdc, 0xffdd, 0xffde, 0xffdf, 0xffe0,
0xffe1, 0xffe2, 0xffe3, 0x07f9, 0xffe4, 0xffe5, 0xffe6, 0xffe7,
0xffe8, 0xffe9, 0xffea, 0xffeb, 0xffec, 0x3fe0, 0xffed, 0xffee,
0xffef, 0xfff0, 0xfff1, 0xfff2, 0xfff3, 0xfff4, 0xfff5, 0x03fa,
0x7fc3, 0xfff6, 0xfff7, 0xfff8, 0xfff9, 0xfffa, 0xfffb, 0xfffc,
0xfffd, 0xfffe
};
/**
* Calculated Cos table For Standard DCT.
*/
#if (__FPU_USED == 1)
static const double sqrt2 = 0.7071067811865475;
static const double cos_tbl[BLOCK_SIZE][BLOCK_SIZE] = {
{1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0},
{0.9807852804032304, 0.8314696123025452, 0.5555702330196023, 0.19509032201612833, -0.1950903220161282, -0.555570233019602, -0.8314696123025453, -0.9807852804032304},
{0.9238795325112867, 0.38268343236508984, -0.3826834323650897, -0.9238795325112867, -0.9238795325112868, -0.38268343236509034, 0.38268343236509, 0.9238795325112865},
{0.8314696123025452, -0.1950903220161282, -0.9807852804032304, -0.5555702330196022, 0.5555702330196018, 0.9807852804032304, 0.19509032201612878, -0.8314696123025451},
{0.7071067811865476, -0.7071067811865475, -0.7071067811865477, 0.7071067811865474, 0.7071067811865477, -0.7071067811865467, -0.7071067811865471, 0.7071067811865466},
{0.5555702330196023, -0.9807852804032304, 0.1950903220161283, 0.8314696123025456, -0.8314696123025451, -0.19509032201612803, 0.9807852804032307, -0.5555702330196015},
{0.38268343236508984, -0.9238795325112868, 0.9238795325112865, -0.3826834323650899, -0.38268343236509056,0.9238795325112867, -0.9238795325112864, 0.38268343236508956},
{0.19509032201612833, -0.5555702330196022, 0.8314696123025456, -0.9807852804032307, 0.9807852804032304, -0.831469612302545, 0.5555702330196015, -0.19509032201612858}
};
#else
#define INTIZATION_RATE 1024
static const int sqrt2 = (int)(0.7071067811865475*INTIZATION_RATE);
static const int cos_tbl[BLOCK_SIZE][BLOCK_SIZE] = {
{(int)(1.0*INTIZATION_RATE), (int)(1.0*INTIZATION_RATE), (int)(1.0*INTIZATION_RATE), (int)(1.0*INTIZATION_RATE), (int)(1.0*INTIZATION_RATE), (int)(1.0*INTIZATION_RATE), (int)(1.0*INTIZATION_RATE), (int)(1.0*INTIZATION_RATE)},
{(int)(0.9807852804032304*INTIZATION_RATE), (int)(0.8314696123025452*INTIZATION_RATE), (int)(0.5555702330196023*INTIZATION_RATE), (int)(0.19509032201612833*INTIZATION_RATE), (int)(-0.1950903220161282*INTIZATION_RATE), (int)(-0.555570233019602*INTIZATION_RATE), (int)(-0.8314696123025453*INTIZATION_RATE), (int)(-0.9807852804032304*INTIZATION_RATE)},
{(int)(0.9238795325112867*INTIZATION_RATE), (int)(0.38268343236508984*INTIZATION_RATE), (int)(-0.3826834323650897*INTIZATION_RATE), (int)(-0.9238795325112867*INTIZATION_RATE), (int)(-0.9238795325112868*INTIZATION_RATE), (int)(-0.38268343236509034*INTIZATION_RATE), (int)(0.38268343236509*INTIZATION_RATE), (int)(0.9238795325112865*INTIZATION_RATE)},
{(int)(0.8314696123025452*INTIZATION_RATE), (int)(-0.1950903220161282*INTIZATION_RATE), (int)(-0.9807852804032304*INTIZATION_RATE), (int)(-0.5555702330196022*INTIZATION_RATE), (int)(0.5555702330196018*INTIZATION_RATE), (int)(0.9807852804032304*INTIZATION_RATE), (int)(0.19509032201612878*INTIZATION_RATE), (int)(-0.8314696123025451*INTIZATION_RATE)},
{(int)(0.7071067811865476*INTIZATION_RATE), (int)(-0.7071067811865475*INTIZATION_RATE), (int)(-0.7071067811865477*INTIZATION_RATE), (int)(0.7071067811865474*INTIZATION_RATE), (int)(0.7071067811865477*INTIZATION_RATE), (int)(-0.7071067811865467*INTIZATION_RATE), (int)(-0.7071067811865471*INTIZATION_RATE), (int)(0.7071067811865466*INTIZATION_RATE)},
{(int)(0.5555702330196023*INTIZATION_RATE), (int)(-0.9807852804032304*INTIZATION_RATE), (int)(0.1950903220161283*INTIZATION_RATE), (int)(0.8314696123025456*INTIZATION_RATE), (int)(-0.8314696123025451*INTIZATION_RATE), (int)(-0.19509032201612803*INTIZATION_RATE), (int)(0.9807852804032307*INTIZATION_RATE), (int)(-0.5555702330196015*INTIZATION_RATE)},
{(int)(0.38268343236508984*INTIZATION_RATE), (int)(-0.9238795325112868*INTIZATION_RATE), (int)(0.9238795325112865*INTIZATION_RATE), (int)(-0.3826834323650899*INTIZATION_RATE), (int)(-0.38268343236509056*INTIZATION_RATE), (int)(0.9238795325112867*INTIZATION_RATE), (int)(-0.9238795325112864*INTIZATION_RATE), (int)(0.38268343236508956*INTIZATION_RATE)},
{(int)(0.19509032201612833*INTIZATION_RATE), (int)(-0.5555702330196022*INTIZATION_RATE), (int)(0.8314696123025456*INTIZATION_RATE), (int)(-0.9807852804032307*INTIZATION_RATE), (int)(0.9807852804032304*INTIZATION_RATE), (int)(-0.831469612302545*INTIZATION_RATE), (int)(0.5555702330196015*INTIZATION_RATE), (int)(-0.19509032201612858*INTIZATION_RATE)}
};
#endif
typedef enum block_mode {
Y,
Cr,
Cb
} block_mode;
typedef struct quant_tbl {
const uint8_t *luminance_quant_tbl;
const uint8_t *chrominance_quant_tbl;
} quant_tbl;
static const quant_tbl quant_tbl_0 = {std_luminance_quant_tbl_0, std_chrominance_quant_tbl_0};
static const quant_tbl quant_tbl_10 = {std_luminance_quant_tbl_10, std_chrominance_quant_tbl_10};
static const quant_tbl quant_tbl_20 = {std_luminance_quant_tbl_20, std_chrominance_quant_tbl_20};
static const quant_tbl quant_tbl_50 = {std_luminance_quant_tbl_50, std_chrominance_quant_tbl_50};
static const quant_tbl quant_tbl_90_2x = { std_luminance_quant_tbl_90_2x, std_chrominance_quant_tbl_90 };
static const quant_tbl quant_tbl_90 = {std_luminance_quant_tbl_90, std_chrominance_quant_tbl_90};
static const quant_tbl quant_tbl_95 = {std_luminance_quant_tbl_95, std_chrominance_quant_tbl_95};
static const quant_tbl quant_tbl_100 = {std_luminance_quant_tbl_100, std_chrominance_quant_tbl_100};
static const quant_tbl* get_quality_tbl(jpeg4c_quality_rate quality) {
switch(quality) {
case jpeg4c_quality_lowest:
return &quant_tbl_0;
case jpeg4c_quality_lower:
return &quant_tbl_10;
case jpeg4c_quality_low20:
return &quant_tbl_20;
case jpeg4c_quality_low:
return &quant_tbl_50;
case jpeg4c_quality_high:
return &quant_tbl_90_2x;
case jpeg4c_quality_higher:
return &quant_tbl_95;
case jpeg4c_quality_highest:
return &quant_tbl_100;
case jpeg4c_quality_normal:
default:
return &quant_tbl_90;
}
}
/* Prototype */
static int split_MCU(jpeg_data *data, const uint8_t *mcu);
static int encode_block_mode(jpeg_data *data, const uint8_t *block, const block_mode mode);
static int dct(int *block, int *temp);
static int quantization(int *block, const block_mode mode, const jpeg4c_quality_rate quality);
static int coding_huff(jpeg_data *data, const int *block, const int pre_DC,
const uint8_t *dc_huff_len_tbl, const int16_t *dc_huff_code_tbl,
const uint8_t *ac_huff_len_tbl, const int16_t *ac_huff_code_tbl);
static void put_bits(jpeg_data *data, const uint_t nbits, const uint16_t val);
static void put_byte(jpeg_data *data, const uint8_t val);
static void flush_bits(jpeg_data *data);
static int init_data(jpeg_data *data);
/**
* Generate JPEG file's header.
* Required "Width" and "Height", "Color type", "Quality".
* Header data in "ret_data[]".
*
* @param data JPEG Structure
* @return Header Length. Under 0 is error.
*/
int generate_header(jpeg_data *data) {
uint8_t *p;
const uint8_t *qt;
int cnt = 0;
const quant_tbl *q_tbl;
color_type color;
init_data(data);
p = data->ret_data;
color = data->c_info.color;
// JFIF header
{
// SOI
p[cnt++]=0xFF;p[cnt++]=0xD8;
// APP0(JFIF)
p[cnt++]=0xFF;p[cnt++]=0xE0;//APP0
p[cnt++]=0x00;p[cnt++]=0x10;//La(Length) = 16 bytes
p[cnt++]=0x4A;p[cnt++]=0x46;p[cnt++]=0x49;p[cnt++]=0x46;p[cnt++]=0x00;//"JFIF\0"
p[cnt++]=0x01;p[cnt++]=0x01;//Version = 1.01
p[cnt++]=0x01;//dots/inch(dpi)
p[cnt++]=0x00;p[cnt++]=0x48;p[cnt++]=0x00;p[cnt++]=0x48;//72*72dpi
p[cnt++]=0x00;p[cnt++]=0x00;//No thumbnail
}
// DQT
{
p[cnt++]=0xFF;p[cnt++]=0xDB;//DQT
switch(color) {
case gray_scale:
p[cnt++]=0x00;p[cnt++]=0x43;//Lq(Length) = 2+65 bytes
//ID:0, Quantization table For luminance
p[cnt++]=0x00;
q_tbl = get_quality_tbl(data->quality);
qt = q_tbl->luminance_quant_tbl;
memcpy(&p[cnt], qt, QUANT_SIZE);
cnt += QUANT_SIZE;
break;
default:
p[cnt++]=0x00;p[cnt++]=0x84;//Lq(Length) = 2+65+65 bytes
//ID:0, Quantization table For luminance
p[cnt++]=0x00;
q_tbl = get_quality_tbl(data->quality);
qt = q_tbl->luminance_quant_tbl;
memcpy(&p[cnt], qt, QUANT_SIZE);
cnt += QUANT_SIZE;
//ID:1, Quantization table For chrominance
p[cnt++]=0x01;
qt = q_tbl->chrominance_quant_tbl;
memcpy(&p[cnt], qt, QUANT_SIZE);
cnt += QUANT_SIZE;
break;
}
}
// DHT
{
p[cnt++]=0xFF;p[cnt++]=0xC4;//DHT
switch(color) {
case gray_scale:
p[cnt++]=0x00;p[cnt++]=0xD2;//Lh(Length) = 2+29+179 bytes
//ID:01, Huffman code table For DC luminance.
p[cnt++]=0x00;
memcpy(&p[cnt], std_dc_luminance_huff_val_tbl, sizeof(std_dc_luminance_huff_val_tbl));
cnt += sizeof(std_dc_luminance_huff_val_tbl);
//ID:10, Huffman code table For AC luminance.
p[cnt++]=0x10;
memcpy(&p[cnt], std_ac_luminance_huff_val_tbl, sizeof(std_ac_luminance_huff_val_tbl));
cnt += sizeof(std_ac_luminance_huff_val_tbl);
break;
default:
p[cnt++]=0x01;p[cnt++]=0xA2;//Lh(Length) = 2+29+179+29+179 bytes
//ID:01, Huffman code table For DC luminance.
p[cnt++]=0x00;
memcpy(&p[cnt], std_dc_luminance_huff_val_tbl, sizeof(std_dc_luminance_huff_val_tbl));
cnt += sizeof(std_dc_luminance_huff_val_tbl);
//ID:10, Huffman code table For AC luminance.
p[cnt++]=0x10;
memcpy(&p[cnt], std_ac_luminance_huff_val_tbl, sizeof(std_ac_luminance_huff_val_tbl));
cnt += sizeof(std_ac_luminance_huff_val_tbl);
//ID:01, Huffman code table For DC chrominance.
p[cnt++]=0x01;
memcpy(&p[cnt], std_dc_chrominance_huff_val_tbl, sizeof(std_dc_chrominance_huff_val_tbl));
cnt += sizeof(std_dc_chrominance_huff_val_tbl);
//ID:11, Huffman code table For AC chrominance.
p[cnt++]=0x11;
memcpy(&p[cnt], std_ac_chrominance_huff_val_tbl, sizeof(std_ac_chrominance_huff_val_tbl));
cnt += sizeof(std_ac_chrominance_huff_val_tbl);
break;
}
}
//SOF0
{
p[cnt++]=0xFF;p[cnt++]=0xC0;//SOF0
switch(color) {
case gray_scale:
p[cnt++]=0x00;p[cnt++]=0x0b;//Lf(Length) = 11 bytes
p[cnt++]=0x08;//Sampling accuracy = 8 bits
p[cnt++]=(uint8_t)(data->height >> 8);p[cnt++]=(uint8_t)(data->height & 0xff);//Height
p[cnt++]=(uint8_t)(data->width >> 8);p[cnt++]=(uint8_t)(data->width & 0xff);//Width
p[cnt++]=0x01;//Number of image components = 1(Grayscale)
p[cnt++]=0x00;p[cnt++]=0x22;p[cnt++]=0x00;//Parameter of Specified luminance component(Sampling coefficient=2/2, Quantization table=0)
break;
default:
p[cnt++]=0x00;p[cnt++]=0x11;//Lf(Length) = 17 bytes
p[cnt++]=0x08;//Sampling accuracy = 8 bits
p[cnt++]=(uint8_t)(data->height >> 8);p[cnt++]=(uint8_t)(data->height & 0xff);//Height
p[cnt++]=(uint8_t)(data->width >> 8);p[cnt++]=(uint8_t)(data->width & 0xff);//Width
p[cnt++]=0x03;//Number of image components = 3(Full Color)
p[cnt++]=0x00;p[cnt++]=0x22;p[cnt++]=0x00;//Parameter of Specified luminance component(Sampling coefficient=2/2, Quantization table=0)
p[cnt++]=0x01;p[cnt++]=0x11;p[cnt++]=0x01;//Parameter of Specified chrominance component(Sampling coefficient=1/1, Quantization table=1)
p[cnt++]=0x02;p[cnt++]=0x11;p[cnt++]=0x01;//Parameter of Specified chrominance component(Sampling coefficient=1/1, Quantization table=1)
break;
}
}
// SOS
{
p[cnt++]=0xFF;p[cnt++]=0xDA;//SOS
switch(color) {
case gray_scale:
p[cnt++]=0x00;p[cnt++]=0x08;//Ls(Length) = 8bytes
p[cnt++]=0x01;//Number of image components = 1(Grayscale)
p[cnt++]=0x00;p[cnt++]=0x00;//Parameter of Specified luminance component
break;
default:
p[cnt++]=0x00;p[cnt++]=0x0c;//Ls(Length) = 12bytes
p[cnt++]=0x03;//Number of image components = 3(Full Color)
p[cnt++]=0x00;p[cnt++]=0x00;//Parameter of Specified luminance component
p[cnt++]=0x01;p[cnt++]=0x11;//Parameter of Specified chrominance component
p[cnt++]=0x02;p[cnt++]=0x11;//Parameter of Specified chrominance component
break;
}
p[cnt++]=0x00;p[cnt++]=0x3F;p[cnt++]=0x00;//Reserved
}
data->data_len = cnt;
return cnt;
}
/**
* Generate JPEG file's footer.
* Footer data in "ret_data[]".
*
* @param data JPEG Structure
* @return Footer Length. Under 0 is error.
*/
int generateFooter(jpeg_data *data) {
uint8_t *p;
int cnt = 0;
init_data(data);
p = data->ret_data;
// Flush left data.
data->data_len = cnt;
flush_bits(data);
cnt = data->data_len;
// EOI
p[cnt++]=0xFF;
p[cnt++]=0xD9;
data->data_len = cnt;
return cnt;
}
/**
* Encoding image data by MCU unit.
* Supported Image format is "8bit Grayscale" and "YUV422(CbYCrY format)".
* Encoded data in "ret_data[]".
*
* @param data JPEG Structure
* @param mcu MCU or Grayscale-Block
* @return Encoded data Length. Under 0 is error.
*/
int encode_MCU(jpeg_data *data, const uint8_t *mcu) {
int ret = 0;
init_data(data);
switch(data->c_info.color) {
case gray_scale:
ret = encode_block_mode(data, mcu, Y);
break;
case YUV411:
default:
ret = split_MCU(data, mcu);
break;
}
return ret;
}
/**
* Reading Image data & Writing Encoded data by each MCU.
* Supported Image format is "8bit Grayscale" and "YUV422(CbYCrY format)" 1-dimensional array.
*
* @param data JPEG Structure
* @param read_data_func Reading Image data function
* @param write_data_func Writing Ecoding data Function
* @return JPEG file size. Under 0 is error.
*/
int encode_image(jpeg_data *data, int (*read_data_func)(uint_t pos, uint8_t *data, uint_t len), int (*write_data_func)(uint8_t *data, uint_t len)) {
int mcu_size = data->c_info.mcu_size;
int width = data->width;
int height = data->height;
int pixel_size_by_byte = data->c_info.pixel_size_by_byte;
//CAUTION!!!!!!!!!! MUST initializing jpeg_data structure!
if(data->mcu_width_max == 0) {
data->mcu_width_max = (int)ceil(width / (float)mcu_size);
data->mcu_height_max = (int)ceil(height / (float)mcu_size);
}
int mcu_width_max = data->mcu_width_max;
int mcu_height_max = data->mcu_height_max;
uint8_t *mcu = data->work.mcu;
uint8_t prePixel_y = 0;
uint8_t prePixel_Crb = 0;
int cnt = 0;
generate_header(data);
write_data_func(data->ret_data, data->data_len);
cnt += data->data_len;
//MUC by CbYCr format & Grayscale.
for(int cur_mcu_height = 0; cur_mcu_height < mcu_height_max; cur_mcu_height++) {
for(int cur_mcu_width = 0; cur_mcu_width < mcu_width_max; cur_mcu_width++) {
for(int cur_height = 0; cur_height < mcu_size; cur_height++) {
if((cur_mcu_height*mcu_size + cur_height) >= height) {
for(int i = 0; i < mcu_size*pixel_size_by_byte; i++) {
if(i%2 == 0) {
mcu[cur_height*mcu_size*pixel_size_by_byte + i] = prePixel_Crb;
} else {
mcu[cur_height*mcu_size*pixel_size_by_byte + i] = prePixel_y;
}
}
} else {
for(int cur_width = 0; cur_width < mcu_size*pixel_size_by_byte; cur_width++) {
if(cur_mcu_width*mcu_size*pixel_size_by_byte + cur_width >= width*pixel_size_by_byte) {
if(cur_width%2 == 0) {
mcu[cur_height*mcu_size*pixel_size_by_byte + cur_width] = prePixel_Crb;
} else {
mcu[cur_height*mcu_size*pixel_size_by_byte + cur_width] = prePixel_y;
}
} else {
read_data_func((cur_mcu_height*mcu_size + cur_height)*width*pixel_size_by_byte + (cur_mcu_width*mcu_size*pixel_size_by_byte + cur_width), &mcu[cur_height*mcu_size*pixel_size_by_byte + cur_width],1);
if(cur_width%2 == 0) {
prePixel_Crb = mcu[cur_height*mcu_size*pixel_size_by_byte + cur_width];
} else {
prePixel_y = mcu[cur_height*mcu_size*pixel_size_by_byte + cur_width];
}
}
}
}
}
encode_MCU(data, mcu);
write_data_func(data->ret_data, data->data_len);
cnt += data->data_len;
}
}
generateFooter(data);
write_data_func(data->ret_data, data->data_len);
cnt += data->data_len;
return cnt;
}
/* private func */
/**
* Split MCU to {Y|Cr|Cb}Blocks.
*
* @param data JPEG Structure
* @param mcu MCU
* @return Encoded data Length. Under 0 is error.
*/
static int split_MCU(jpeg_data *data, const uint8_t *mcu) {
int ret = 0;
int step = data->c_info.pixel_size_by_byte;
uint8_t *block_y = data->work.block_y;
uint8_t *block_Cr = data->work.block_Cr;
uint8_t *block_Cb = data->work.block_Cb;
// Y
for(int y = 0; y < 2; y++) {
for(int x = 0; x < 2; x++) {
for(int cur_block_height = 0; cur_block_height < BLOCK_SIZE; cur_block_height++) {
for(int cur_block_width = 0; cur_block_width < BLOCK_SIZE; cur_block_width++) {
block_y[cur_block_height*BLOCK_SIZE + cur_block_width] = mcu[((cur_block_height+(y*BLOCK_SIZE))*MCU_SIZE_COLOR*step) + (cur_block_width*step+(x*MCU_SIZE_COLOR))+1];
}
}
ret = encode_block_mode(data, block_y, Y);
}
}
// Cb, Cr
for(int cur_block_height = 0; cur_block_height < BLOCK_SIZE; cur_block_height++) {
for(int cur_block_width = 0; cur_block_width < BLOCK_SIZE; cur_block_width++) {
block_Cb[cur_block_height*BLOCK_SIZE + cur_block_width] = mcu[(cur_block_height*MCU_SIZE_COLOR*2*step) + (cur_block_width*2*step)];
block_Cr[cur_block_height*BLOCK_SIZE + cur_block_width] = mcu[(cur_block_height*MCU_SIZE_COLOR*2*step) + (cur_block_width*2*step) +2];
}
}
ret = encode_block_mode(data, block_Cb, Cb);
ret = encode_block_mode(data, block_Cr, Cr);
return ret;
}
/**
* Encoding image data by {Y|Cr|Cb}Block unit.
* Encoded data in "ret_data[]".
*
* @param data JPEG Structure
* @param block {Y|Cr|Cb}Block
* @param mode YUV(Y,Cr,Cb) Type
* @return Encoded data Length. Under 0 is error.
*/
static int encode_block_mode(jpeg_data *data, const uint8_t *block, const block_mode mode) {
int *block_int;
int ret = 0;
block_int = data->work.block_int;
for(int i = 0; i < BLOCK_SIZE*BLOCK_SIZE; i++) {
block_int[i] = block[i]&0xff;
block_int[i] -= 128;
}
dct(block_int, data->work.temp);
quantization(block_int, mode, data->quality);
switch(mode) {
case Cr:
coding_huff(data, block_int, data->pre_DC_Cr, std_dc_chrominance_huff_len_tbl, std_dc_chrominance_huff_code_tbl, std_ac_chrominance_huff_len_tbl, std_ac_chrominance_huff_code_tbl);
data->pre_DC_Cr = block_int[0];
break;
case Cb:
coding_huff(data, block_int, data->pre_DC_Cb, std_dc_chrominance_huff_len_tbl, std_dc_chrominance_huff_code_tbl, std_ac_chrominance_huff_len_tbl, std_ac_chrominance_huff_code_tbl);
data->pre_DC_Cb = block_int[0];
break;
case Y:
default:
coding_huff(data, block_int, data->pre_DC_Y, std_dc_luminance_huff_len_tbl, std_dc_luminance_huff_code_tbl, std_ac_luminance_huff_len_tbl, std_ac_luminance_huff_code_tbl);
data->pre_DC_Y = block_int[0];
break;
}
ret = data->data_len;
return ret;
}
/**
* DCT function.
*
* @param block {Y|Cr|Cb}Block
* @param work Temporary Array
* @return success(1) or error(Under 0)
*/
static int dct(int *block, int *work){
int ret = 1;
//DCT
for(int v = 0; v < BLOCK_SIZE; v++){
#if (__FPU_USED == 1)
double cv = (v == 0) ? sqrt2 : 1.0;
#else
int cv = (v == 0) ? sqrt2 : INTIZATION_RATE;
#endif
for(int u = 0; u < BLOCK_SIZE; u++){
#if (__FPU_USED == 1)
double cu = (u == 0) ? sqrt2 : 1.0;
double sum = 0.0;
#else
int cu = (u == 0) ? sqrt2 : INTIZATION_RATE;
int sum = 0;
int tmp = 0;
#endif
for(int y = 0; y < BLOCK_SIZE;y++) {
for(int x = 0; x < BLOCK_SIZE; x++) {
#if (__FPU_USED == 1)
sum += block[y * BLOCK_SIZE + x] * cos_tbl[u][x] * cos_tbl[v][y];
#else
tmp = block[y * BLOCK_SIZE + x] * cos_tbl[u][x] / INTIZATION_RATE;
tmp = tmp * cos_tbl[v][y] / INTIZATION_RATE;
sum += tmp;
#endif
}
}
#if (__FPU_USED == 1)
work[v * BLOCK_SIZE + u] = (int)(sum * cu * cv / 4);
#else
tmp = sum * cu / 4 / INTIZATION_RATE;
work[v * BLOCK_SIZE + u] = tmp * cv / INTIZATION_RATE;
#endif
}
}
for(int i = 0; i < BLOCK_SIZE*BLOCK_SIZE; i++) {
block[i] = work[zigzag_tbl[i]];
}
return ret;
}
/**
* Quantization function.
*
* @param block {Y|Cr|Cb}Block
* @param mode YUV(Y,Cr,Cb) Type
* @param quality Quality of quantization.
* @return success(1) or error(Under 0)
*/
static int quantization(int *block, const block_mode mode, const jpeg4c_quality_rate quality){
int ret = 1;
const uint8_t *qt;
const quant_tbl *qt_tbl;
qt_tbl = get_quality_tbl(quality);
switch(mode) {
case Cr:
case Cb:
qt = qt_tbl->chrominance_quant_tbl;
break;
case Y:
default:
qt = qt_tbl->luminance_quant_tbl;
break;
}
for(int i = 0; i < QUANT_SIZE; i++) {
block[i] /= qt[i];
}
return ret;
}
/**
* Huffman Code function.