libavcodec/mjpegdec.h

   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 libavcodec/mjpegdec.h
  26  * MJPEG decoder.
  27  */
  28
  29 #ifndef AVCODEC_MJPEGDEC_H
  30 #define AVCODEC_MJPEGDEC_H
  31
  32 #include "avcodec.h"
  33 #include "get_bits.h"
  34 #include "dsputil.h"
  35
  36 #define MAX_COMPONENTS 4
  37
  38 typedef struct MJpegDecodeContext {
  39     AVCodecContext *avctx;
  40     GetBitContext gb;
  41
  42     int start_code; /* current start code */
  43     int buffer_size;
  44     uint8_t *buffer;
  45
  46     int16_t quant_matrixes[4][64];
  47     VLC vlcs[2][4];
  48     int qscale[4];      ///< quantizer scale calculated from quant_matrixes
  49
  50     int org_height;  /* size given at codec init */
  51     int first_picture;    /* true if decoding first picture */
  52     int interlaced;     /* true if interlaced */
  53     int bottom_field;   /* true if bottom field */
  54     int lossless;
  55     int ls;
  56     int progressive;
  57     int rgb;
  58     int rct;            /* standard rct */
  59     int pegasus_rct;    /* pegasus reversible colorspace transform */
  60     int bits;           /* bits per component */
  61
  62     int maxval;
  63     int near;         ///< near lossless bound (si 0 for lossless)
  64     int t1,t2,t3;
  65     int reset;        ///< context halfing intervall ?rename
  66
  67     int width, height;
  68     int mb_width, mb_height;
  69     int nb_components;
  70     int block_stride[MAX_COMPONENTS];
  71     int component_id[MAX_COMPONENTS];
  72     int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
  73     int v_count[MAX_COMPONENTS];
  74     int comp_index[MAX_COMPONENTS];
  75     int dc_index[MAX_COMPONENTS];
  76     int ac_index[MAX_COMPONENTS];
  77     int nb_blocks[MAX_COMPONENTS];
  78     int h_scount[MAX_COMPONENTS];
  79     int v_scount[MAX_COMPONENTS];
  80     int h_max, v_max; /* maximum h and v counts */
  81     int quant_index[4];   /* quant table index for each component */
  82     int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
  83     AVFrame picture; /* picture structure */
  84     int got_picture;                                ///< we found a SOF and picture is valid, too.
  85     int linesize[MAX_COMPONENTS];                   ///< linesize << interlaced
  86     int8_t *qscale_table;
  87     DECLARE_ALIGNED_16(DCTELEM, block[64]);
  88     DCTELEM (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
  89     uint8_t *last_nnz[MAX_COMPONENTS];
  90     uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
  91     ScanTable scantable;
  92     DSPContext dsp;
  93
  94     int restart_interval;
  95     int restart_count;
  96
  97     int buggy_avid;
  98     int cs_itu601;
  99     int interlace_polarity;
 100
 101     int mjpb_skiptosod;
 102
 103     int cur_scan; /* current scan, used by JPEG-LS */
 104 } MJpegDecodeContext;
 105
 106 int ff_mjpeg_decode_init(AVCodecContext *avctx);
 107 int ff_mjpeg_decode_end(AVCodecContext *avctx);
 108 int ff_mjpeg_decode_frame(AVCodecContext *avctx,
 109                           void *data, int *data_size,
 110                           AVPacket *avpkt);
 111 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s);
 112 int ff_mjpeg_decode_dht(MJpegDecodeContext *s);
 113 int ff_mjpeg_decode_sof(MJpegDecodeContext *s);
 114 int ff_mjpeg_decode_sos(MJpegDecodeContext *s);
 115
 116 #endif /* AVCODEC_MJPEGDEC_H */