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  1. /*
  2.  * MJPEG encoder and decoder
  3.  * Copyright (c) 2000, 2001 Fabrice Bellard
  4.  * Copyright (c) 2003 Alex Beregszaszi
  5.  * Copyright (c) 2003-2004 Michael Niedermayer
  6.  *
  7.  * Support for external huffman table, various fixes (AVID workaround),
  8.  * aspecting, new decode_frame mechanism and apple mjpeg-b support
  9.  *                                  by Alex Beregszaszi
  10.  *
  11.  * This file is part of FFmpeg.
  12.  *
  13.  * FFmpeg is free software; you can redistribute it and/or
  14.  * modify it under the terms of the GNU Lesser General Public
  15.  * License as published by the Free Software Foundation; either
  16.  * version 2.1 of the License, or (at your option) any later version.
  17.  *
  18.  * FFmpeg is distributed in the hope that it will be useful,
  19.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  21.  * Lesser General Public License for more details.
  22.  *
  23.  * You should have received a copy of the GNU Lesser General Public
  24.  * License along with FFmpeg; if not, write to the Free Software
  25.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  26.  */
  27.  
  28. /**
  29.  * @file
  30.  * MJPEG encoder and decoder.
  31.  */
  32.  
  33. #ifndef AVCODEC_MJPEG_H
  34. #define AVCODEC_MJPEG_H
  35.  
  36. #include "avcodec.h"
  37. #include "put_bits.h"
  38.  
  39.  
  40. /* JPEG marker codes */
  41. typedef enum {
  42.     /* start of frame */
  43.     SOF0  = 0xc0,       /* baseline */
  44.     SOF1  = 0xc1,       /* extended sequential, huffman */
  45.     SOF2  = 0xc2,       /* progressive, huffman */
  46.     SOF3  = 0xc3,       /* lossless, huffman */
  47.  
  48.     SOF5  = 0xc5,       /* differential sequential, huffman */
  49.     SOF6  = 0xc6,       /* differential progressive, huffman */
  50.     SOF7  = 0xc7,       /* differential lossless, huffman */
  51.     JPG   = 0xc8,       /* reserved for JPEG extension */
  52.     SOF9  = 0xc9,       /* extended sequential, arithmetic */
  53.     SOF10 = 0xca,       /* progressive, arithmetic */
  54.     SOF11 = 0xcb,       /* lossless, arithmetic */
  55.  
  56.     SOF13 = 0xcd,       /* differential sequential, arithmetic */
  57.     SOF14 = 0xce,       /* differential progressive, arithmetic */
  58.     SOF15 = 0xcf,       /* differential lossless, arithmetic */
  59.  
  60.     DHT   = 0xc4,       /* define huffman tables */
  61.  
  62.     DAC   = 0xcc,       /* define arithmetic-coding conditioning */
  63.  
  64.     /* restart with modulo 8 count "m" */
  65.     RST0  = 0xd0,
  66.     RST1  = 0xd1,
  67.     RST2  = 0xd2,
  68.     RST3  = 0xd3,
  69.     RST4  = 0xd4,
  70.     RST5  = 0xd5,
  71.     RST6  = 0xd6,
  72.     RST7  = 0xd7,
  73.  
  74.     SOI   = 0xd8,       /* start of image */
  75.     EOI   = 0xd9,       /* end of image */
  76.     SOS   = 0xda,       /* start of scan */
  77.     DQT   = 0xdb,       /* define quantization tables */
  78.     DNL   = 0xdc,       /* define number of lines */
  79.     DRI   = 0xdd,       /* define restart interval */
  80.     DHP   = 0xde,       /* define hierarchical progression */
  81.     EXP   = 0xdf,       /* expand reference components */
  82.  
  83.     APP0  = 0xe0,
  84.     APP1  = 0xe1,
  85.     APP2  = 0xe2,
  86.     APP3  = 0xe3,
  87.     APP4  = 0xe4,
  88.     APP5  = 0xe5,
  89.     APP6  = 0xe6,
  90.     APP7  = 0xe7,
  91.     APP8  = 0xe8,
  92.     APP9  = 0xe9,
  93.     APP10 = 0xea,
  94.     APP11 = 0xeb,
  95.     APP12 = 0xec,
  96.     APP13 = 0xed,
  97.     APP14 = 0xee,
  98.     APP15 = 0xef,
  99.  
  100.     JPG0  = 0xf0,
  101.     JPG1  = 0xf1,
  102.     JPG2  = 0xf2,
  103.     JPG3  = 0xf3,
  104.     JPG4  = 0xf4,
  105.     JPG5  = 0xf5,
  106.     JPG6  = 0xf6,
  107.     SOF48 = 0xf7,       ///< JPEG-LS
  108.     LSE   = 0xf8,       ///< JPEG-LS extension parameters
  109.     JPG9  = 0xf9,
  110.     JPG10 = 0xfa,
  111.     JPG11 = 0xfb,
  112.     JPG12 = 0xfc,
  113.     JPG13 = 0xfd,
  114.  
  115.     COM   = 0xfe,       /* comment */
  116.  
  117.     TEM   = 0x01,       /* temporary private use for arithmetic coding */
  118.  
  119.     /* 0x02 -> 0xbf reserved */
  120. } JPEG_MARKER;
  121.  
  122. static inline void put_marker(PutBitContext *p, int code)
  123. {
  124.     put_bits(p, 8, 0xff);
  125.     put_bits(p, 8, code);
  126. }
  127.  
  128. #define PREDICT(ret, topleft, top, left, predictor)\
  129.     switch(predictor){\
  130.         case 0: ret= 0; break;\
  131.         case 1: ret= left; break;\
  132.         case 2: ret= top; break;\
  133.         case 3: ret= topleft; break;\
  134.         case 4: ret= left   +   top - topleft; break;\
  135.         case 5: ret= left   + ((top - topleft)>>1); break;\
  136.         case 6: ret= top + ((left   - topleft)>>1); break;\
  137.         default:\
  138.         case 7: ret= (left + top)>>1; break;\
  139.     }
  140.  
  141. extern av_export const uint8_t avpriv_mjpeg_bits_dc_luminance[];
  142. extern av_export const uint8_t avpriv_mjpeg_val_dc[];
  143.  
  144. extern av_export const uint8_t avpriv_mjpeg_bits_dc_chrominance[];
  145.  
  146. extern av_export const uint8_t avpriv_mjpeg_bits_ac_luminance[];
  147. extern av_export const uint8_t avpriv_mjpeg_val_ac_luminance[];
  148.  
  149. extern av_export const uint8_t avpriv_mjpeg_bits_ac_chrominance[];
  150. extern av_export const uint8_t avpriv_mjpeg_val_ac_chrominance[];
  151.  
  152. void ff_mjpeg_build_huffman_codes(uint8_t *huff_size, uint16_t *huff_code,
  153.                                   const uint8_t *bits_table,
  154.                                   const uint8_t *val_table);
  155.  
  156. #endif /* AVCODEC_MJPEG_H */
  157.