yading@10: /*
yading@10:  * MJPEG decoder
yading@10:  * Copyright (c) 2000, 2001 Fabrice Bellard
yading@10:  * Copyright (c) 2003 Alex Beregszaszi
yading@10:  * Copyright (c) 2003-2004 Michael Niedermayer
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * MJPEG decoder.
yading@10:  */
yading@10: 
yading@10: #ifndef AVCODEC_MJPEGDEC_H
yading@10: #define AVCODEC_MJPEGDEC_H
yading@10: 
yading@10: #include "libavutil/log.h"
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "get_bits.h"
yading@10: #include "dsputil.h"
yading@10: #include "hpeldsp.h"
yading@10: 
yading@10: #define MAX_COMPONENTS 4
yading@10: 
yading@10: typedef struct MJpegDecodeContext {
yading@10:     AVClass *class;
yading@10:     AVCodecContext *avctx;
yading@10:     GetBitContext gb;
yading@10: 
yading@10:     int start_code; /* current start code */
yading@10:     int buffer_size;
yading@10:     uint8_t *buffer;
yading@10: 
yading@10:     int16_t quant_matrixes[4][64];
yading@10:     VLC vlcs[3][4];
yading@10:     int qscale[4];      ///< quantizer scale calculated from quant_matrixes
yading@10: 
yading@10:     int org_height;  /* size given at codec init */
yading@10:     int first_picture;    /* true if decoding first picture */
yading@10:     int interlaced;     /* true if interlaced */
yading@10:     int bottom_field;   /* true if bottom field */
yading@10:     int lossless;
yading@10:     int ls;
yading@10:     int progressive;
yading@10:     int rgb;
yading@10:     int upscale_h;
yading@10:     int chroma_height;
yading@10:     int upscale_v;
yading@10:     int rct;            /* standard rct */
yading@10:     int pegasus_rct;    /* pegasus reversible colorspace transform */
yading@10:     int bits;           /* bits per component */
yading@10: 
yading@10:     int maxval;
yading@10:     int near;         ///< near lossless bound (si 0 for lossless)
yading@10:     int t1,t2,t3;
yading@10:     int reset;        ///< context halfing interval ?rename
yading@10: 
yading@10:     int width, height;
yading@10:     int mb_width, mb_height;
yading@10:     int nb_components;
yading@10:     int block_stride[MAX_COMPONENTS];
yading@10:     int component_id[MAX_COMPONENTS];
yading@10:     int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
yading@10:     int v_count[MAX_COMPONENTS];
yading@10:     int comp_index[MAX_COMPONENTS];
yading@10:     int dc_index[MAX_COMPONENTS];
yading@10:     int ac_index[MAX_COMPONENTS];
yading@10:     int nb_blocks[MAX_COMPONENTS];
yading@10:     int h_scount[MAX_COMPONENTS];
yading@10:     int v_scount[MAX_COMPONENTS];
yading@10:     int h_max, v_max; /* maximum h and v counts */
yading@10:     int quant_index[4];   /* quant table index for each component */
yading@10:     int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
yading@10:     AVFrame picture; /* picture structure */
yading@10:     AVFrame *picture_ptr; /* pointer to picture structure */
yading@10:     int got_picture;                                ///< we found a SOF and picture is valid, too.
yading@10:     int linesize[MAX_COMPONENTS];                   ///< linesize << interlaced
yading@10:     int8_t *qscale_table;
yading@10:     DECLARE_ALIGNED(16, int16_t, block)[64];
yading@10:     int16_t (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
yading@10:     uint8_t *last_nnz[MAX_COMPONENTS];
yading@10:     uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
yading@10:     ScanTable scantable;
yading@10:     DSPContext dsp;
yading@10:     HpelDSPContext hdsp;
yading@10: 
yading@10:     int restart_interval;
yading@10:     int restart_count;
yading@10: 
yading@10:     int buggy_avid;
yading@10:     int cs_itu601;
yading@10:     int interlace_polarity;
yading@10: 
yading@10:     int mjpb_skiptosod;
yading@10: 
yading@10:     int cur_scan; /* current scan, used by JPEG-LS */
yading@10:     int flipped; /* true if picture is flipped */
yading@10: 
yading@10:     uint16_t (*ljpeg_buffer)[4];
yading@10:     unsigned int ljpeg_buffer_size;
yading@10: 
yading@10:     int extern_huff;
yading@10: } MJpegDecodeContext;
yading@10: 
yading@10: int ff_mjpeg_decode_init(AVCodecContext *avctx);
yading@10: int ff_mjpeg_decode_end(AVCodecContext *avctx);
yading@10: int ff_mjpeg_decode_frame(AVCodecContext *avctx,
yading@10:                           void *data, int *got_frame,
yading@10:                           AVPacket *avpkt);
yading@10: int ff_mjpeg_decode_dqt(MJpegDecodeContext *s);
yading@10: int ff_mjpeg_decode_dht(MJpegDecodeContext *s);
yading@10: int ff_mjpeg_decode_sof(MJpegDecodeContext *s);
yading@10: int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
yading@10:                         const uint8_t *mb_bitmask, const AVFrame *reference);
yading@10: int ff_mjpeg_find_marker(MJpegDecodeContext *s,
yading@10:                          const uint8_t **buf_ptr, const uint8_t *buf_end,
yading@10:                          const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
yading@10: 
yading@10: #endif /* AVCODEC_MJPEGDEC_H */