ffmpeg / libavcodec / mjpeg.h @ 4922a5b0
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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) 20032004 Michael Niedermayer

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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 021101301 USA

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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 mjpegb support

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* by Alex Beregszaszi

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*/

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/**

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* @file mjpeg.h

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* MJPEG encoder and decoder.

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*/

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#ifndef MJPEG_H

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#define MJPEG_H

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#include "avcodec.h" 
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#include "bitstream.h" 
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#include "dsputil.h" 
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#include "mpegvideo.h" 
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/* JPEG marker codes */

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typedef enum { 
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/* start of frame */

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SOF0 = 0xc0, /* baseline */ 
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SOF1 = 0xc1, /* extended sequential, huffman */ 
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SOF2 = 0xc2, /* progressive, huffman */ 
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SOF3 = 0xc3, /* lossless, huffman */ 
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SOF5 = 0xc5, /* differential sequential, huffman */ 
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SOF6 = 0xc6, /* differential progressive, huffman */ 
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SOF7 = 0xc7, /* differential lossless, huffman */ 
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JPG = 0xc8, /* reserved for JPEG extension */ 
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SOF9 = 0xc9, /* extended sequential, arithmetic */ 
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SOF10 = 0xca, /* progressive, arithmetic */ 
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SOF11 = 0xcb, /* lossless, arithmetic */ 
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SOF13 = 0xcd, /* differential sequential, arithmetic */ 
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SOF14 = 0xce, /* differential progressive, arithmetic */ 
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SOF15 = 0xcf, /* differential lossless, arithmetic */ 
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DHT = 0xc4, /* define huffman tables */ 
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DAC = 0xcc, /* define arithmeticcoding conditioning */ 
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/* restart with modulo 8 count "m" */

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RST0 = 0xd0,

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RST1 = 0xd1,

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RST2 = 0xd2,

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RST3 = 0xd3,

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RST4 = 0xd4,

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RST5 = 0xd5,

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RST6 = 0xd6,

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RST7 = 0xd7,

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SOI = 0xd8, /* start of image */ 
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EOI = 0xd9, /* end of image */ 
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SOS = 0xda, /* start of scan */ 
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DQT = 0xdb, /* define quantization tables */ 
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DNL = 0xdc, /* define number of lines */ 
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DRI = 0xdd, /* define restart interval */ 
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DHP = 0xde, /* define hierarchical progression */ 
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EXP = 0xdf, /* expand reference components */ 
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APP0 = 0xe0,

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APP1 = 0xe1,

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APP2 = 0xe2,

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APP3 = 0xe3,

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APP4 = 0xe4,

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APP5 = 0xe5,

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APP6 = 0xe6,

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APP7 = 0xe7,

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APP8 = 0xe8,

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APP9 = 0xe9,

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APP10 = 0xea,

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APP11 = 0xeb,

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APP12 = 0xec,

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APP13 = 0xed,

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APP14 = 0xee,

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APP15 = 0xef,

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JPG0 = 0xf0,

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JPG1 = 0xf1,

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JPG2 = 0xf2,

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JPG3 = 0xf3,

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JPG4 = 0xf4,

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JPG5 = 0xf5,

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JPG6 = 0xf6,

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SOF48 = 0xf7, ///< JPEGLS 
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LSE = 0xf8, ///< JPEGLS extension parameters 
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JPG9 = 0xf9,

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JPG10 = 0xfa,

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JPG11 = 0xfb,

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JPG12 = 0xfc,

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JPG13 = 0xfd,

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COM = 0xfe, /* comment */ 
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TEM = 0x01, /* temporary private use for arithmetic coding */ 
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/* 0x02 > 0xbf reserved */

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} JPEG_MARKER; 
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static inline void put_marker(PutBitContext *p, int code) 
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{ 
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put_bits(p, 8, 0xff); 
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put_bits(p, 8, code);

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} 
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#define MAX_COMPONENTS 4 
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typedef struct MJpegDecodeContext { 
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AVCodecContext *avctx; 
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GetBitContext gb; 
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int start_code; /* current start code */ 
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int buffer_size;

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uint8_t *buffer; 
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int16_t quant_matrixes[4][64]; 
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VLC vlcs[2][4]; 
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int qscale[4]; ///< quantizer scale calculated from quant_matrixes 
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int org_height; /* size given at codec init */ 
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int first_picture; /* true if decoding first picture */ 
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int interlaced; /* true if interlaced */ 
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int bottom_field; /* true if bottom field */ 
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int lossless;

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int ls;

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int progressive;

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int rgb;

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int rct; /* standard rct */ 
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int pegasus_rct; /* pegasus reversible colorspace transform */ 
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int bits; /* bits per component */ 
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int maxval;

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int near; ///< near lossless bound (si 0 for lossless) 
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int t1,t2,t3;

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int reset; ///< context halfing intervall ?rename 
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int width, height;

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int mb_width, mb_height;

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int nb_components;

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int component_id[MAX_COMPONENTS];

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int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */ 
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int v_count[MAX_COMPONENTS];

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int comp_index[MAX_COMPONENTS];

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int dc_index[MAX_COMPONENTS];

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int ac_index[MAX_COMPONENTS];

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int nb_blocks[MAX_COMPONENTS];

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int h_scount[MAX_COMPONENTS];

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int v_scount[MAX_COMPONENTS];

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int h_max, v_max; /* maximum h and v counts */ 
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int quant_index[4]; /* quant table index for each component */ 
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int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */ 
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AVFrame picture; /* picture structure */

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int linesize[MAX_COMPONENTS]; ///< linesize << interlaced 
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int8_t *qscale_table; 
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DECLARE_ALIGNED_8(DCTELEM, block[64]);

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ScanTable scantable; 
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DSPContext dsp; 
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int restart_interval;

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int restart_count;

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int buggy_avid;

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int cs_itu601;

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int interlace_polarity;

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int mjpb_skiptosod;

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int cur_scan; /* current scan, used by JPEGLS */ 
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} MJpegDecodeContext; 
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#define PREDICT(ret, topleft, top, left, predictor)\

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switch(predictor){\

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case 1: ret= left; break;\ 
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case 2: ret= top; break;\ 
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case 3: ret= topleft; break;\ 
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case 4: ret= left + top  topleft; break;\ 
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case 5: ret= left + ((top  topleft)>>1); break;\ 
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case 6: ret= top + ((left  topleft)>>1); break;\ 
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default:\

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case 7: ret= (left + top)>>1; break;\ 
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} 
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extern const uint8_t bits_dc_luminance[]; 
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extern const uint8_t val_dc_luminance[]; 
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extern const uint8_t bits_dc_chrominance[]; 
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extern const uint8_t val_dc_chrominance[]; 
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extern const uint8_t bits_ac_luminance[]; 
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extern const uint8_t val_ac_luminance[]; 
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extern const uint8_t bits_ac_chrominance[]; 
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extern const uint8_t val_ac_chrominance[]; 
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void build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,

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const uint8_t *bits_table, const uint8_t *val_table); 
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#endif /* MJPEG_H */ 