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ffmpeg / libavcodec / mjpegdec.h @ 84dc2d8a

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/*
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 * MJPEG 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) 2003-2004 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 02110-1301 USA
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 */
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/**
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 * @file libavcodec/mjpegdec.h
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 * MJPEG decoder.
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 */
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#ifndef AVCODEC_MJPEGDEC_H
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#define AVCODEC_MJPEGDEC_H
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#include "avcodec.h"
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#include "get_bits.h"
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#include "dsputil.h"
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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 block_stride[MAX_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 got_picture;                                ///< we found a SOF and picture is valid, too.
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    int linesize[MAX_COMPONENTS];                   ///< linesize << interlaced
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    int8_t *qscale_table;
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    DECLARE_ALIGNED(16, DCTELEM, block)[64];
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    DCTELEM (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
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    uint8_t *last_nnz[MAX_COMPONENTS];
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    uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
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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 JPEG-LS */
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    int flipped; /* true if picture is flipped */
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    uint16_t (*ljpeg_buffer)[4];
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    unsigned int ljpeg_buffer_size;
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} MJpegDecodeContext;
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int ff_mjpeg_decode_init(AVCodecContext *avctx);
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int ff_mjpeg_decode_end(AVCodecContext *avctx);
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int ff_mjpeg_decode_frame(AVCodecContext *avctx,
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                          void *data, int *data_size,
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                          AVPacket *avpkt);
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int ff_mjpeg_decode_dqt(MJpegDecodeContext *s);
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int ff_mjpeg_decode_dht(MJpegDecodeContext *s);
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int ff_mjpeg_decode_sof(MJpegDecodeContext *s);
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int ff_mjpeg_decode_sos(MJpegDecodeContext *s);
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#endif /* AVCODEC_MJPEGDEC_H */