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  1. /*
  2.  * MJPEG decoder
  3.  * Copyright (c) 2000, 2001 Fabrice Bellard
  4.  * Copyright (c) 2003 Alex Beregszaszi
  5.  * Copyright (c) 2003-2004 Michael Niedermayer
  6.  *
  7.  * This file is part of FFmpeg.
  8.  *
  9.  * FFmpeg is free software; you can redistribute it and/or
  10.  * modify it under the terms of the GNU Lesser General Public
  11.  * License as published by the Free Software Foundation; either
  12.  * version 2.1 of the License, or (at your option) any later version.
  13.  *
  14.  * FFmpeg is distributed in the hope that it will be useful,
  15.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17.  * Lesser General Public License for more details.
  18.  *
  19.  * You should have received a copy of the GNU Lesser General Public
  20.  * License along with FFmpeg; if not, write to the Free Software
  21.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22.  */
  23.  
  24. /**
  25.  * @file
  26.  * MJPEG decoder.
  27.  */
  28.  
  29. #ifndef AVCODEC_MJPEGDEC_H
  30. #define AVCODEC_MJPEGDEC_H
  31.  
  32. #include "libavutil/log.h"
  33.  
  34. #include "avcodec.h"
  35. #include "get_bits.h"
  36. #include "dsputil.h"
  37. #include "hpeldsp.h"
  38.  
  39. #define MAX_COMPONENTS 4
  40.  
  41. typedef struct MJpegDecodeContext {
  42.     AVClass *class;
  43.     AVCodecContext *avctx;
  44.     GetBitContext gb;
  45.  
  46.     int start_code; /* current start code */
  47.     int buffer_size;
  48.     uint8_t *buffer;
  49.  
  50.     int16_t quant_matrixes[4][64];
  51.     VLC vlcs[3][4];
  52.     int qscale[4];      ///< quantizer scale calculated from quant_matrixes
  53.  
  54.     int org_height;  /* size given at codec init */
  55.     int first_picture;    /* true if decoding first picture */
  56.     int interlaced;     /* true if interlaced */
  57.     int bottom_field;   /* true if bottom field */
  58.     int lossless;
  59.     int ls;
  60.     int progressive;
  61.     int rgb;
  62.     int upscale_h;
  63.     int chroma_height;
  64.     int upscale_v;
  65.     int rct;            /* standard rct */
  66.     int pegasus_rct;    /* pegasus reversible colorspace transform */
  67.     int bits;           /* bits per component */
  68.     int colr;
  69.     int xfrm;
  70.  
  71.     int maxval;
  72.     int near;         ///< near lossless bound (si 0 for lossless)
  73.     int t1,t2,t3;
  74.     int reset;        ///< context halfing interval ?rename
  75.  
  76.     int width, height;
  77.     int mb_width, mb_height;
  78.     int nb_components;
  79.     int block_stride[MAX_COMPONENTS];
  80.     int component_id[MAX_COMPONENTS];
  81.     int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
  82.     int v_count[MAX_COMPONENTS];
  83.     int comp_index[MAX_COMPONENTS];
  84.     int dc_index[MAX_COMPONENTS];
  85.     int ac_index[MAX_COMPONENTS];
  86.     int nb_blocks[MAX_COMPONENTS];
  87.     int h_scount[MAX_COMPONENTS];
  88.     int v_scount[MAX_COMPONENTS];
  89.     int quant_sindex[MAX_COMPONENTS];
  90.     int h_max, v_max; /* maximum h and v counts */
  91.     int quant_index[4];   /* quant table index for each component */
  92.     int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
  93.     AVFrame picture; /* picture structure */
  94.     AVFrame *picture_ptr; /* pointer to picture structure */
  95.     int got_picture;                                ///< we found a SOF and picture is valid, too.
  96.     int linesize[MAX_COMPONENTS];                   ///< linesize << interlaced
  97.     int8_t *qscale_table;
  98.     DECLARE_ALIGNED(16, int16_t, block)[64];
  99.     int16_t (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
  100.     uint8_t *last_nnz[MAX_COMPONENTS];
  101.     uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
  102.     ScanTable scantable;
  103.     DSPContext dsp;
  104.     HpelDSPContext hdsp;
  105.  
  106.     int restart_interval;
  107.     int restart_count;
  108.  
  109.     int buggy_avid;
  110.     int cs_itu601;
  111.     int interlace_polarity;
  112.  
  113.     int mjpb_skiptosod;
  114.  
  115.     int cur_scan; /* current scan, used by JPEG-LS */
  116.     int flipped; /* true if picture is flipped */
  117.  
  118.     uint16_t (*ljpeg_buffer)[4];
  119.     unsigned int ljpeg_buffer_size;
  120.  
  121.     int extern_huff;
  122.     AVDictionary *exif_metadata;
  123. } MJpegDecodeContext;
  124.  
  125. int ff_mjpeg_decode_init(AVCodecContext *avctx);
  126. int ff_mjpeg_decode_end(AVCodecContext *avctx);
  127. int ff_mjpeg_decode_frame(AVCodecContext *avctx,
  128.                           void *data, int *got_frame,
  129.                           AVPacket *avpkt);
  130. int ff_mjpeg_decode_dqt(MJpegDecodeContext *s);
  131. int ff_mjpeg_decode_dht(MJpegDecodeContext *s);
  132. int ff_mjpeg_decode_sof(MJpegDecodeContext *s);
  133. int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
  134.                         const uint8_t *mb_bitmask, const AVFrame *reference);
  135. int ff_mjpeg_find_marker(MJpegDecodeContext *s,
  136.                          const uint8_t **buf_ptr, const uint8_t *buf_end,
  137.                          const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
  138.  
  139. #endif /* AVCODEC_MJPEGDEC_H */
  140.