FFmpeg: libavcodec/mjpegdec.h Source File

00001 /*
00002  * MJPEG decoder
00003  * Copyright (c) 2000, 2001 Fabrice Bellard
00004  * Copyright (c) 2003 Alex Beregszaszi
00005  * Copyright (c) 2003-2004 Michael Niedermayer
00006  *
00007  * This file is part of FFmpeg.
00008  *
00009  * FFmpeg is free software; you can redistribute it and/or
00010  * modify it under the terms of the GNU Lesser General Public
00011  * License as published by the Free Software Foundation; either
00012  * version 2.1 of the License, or (at your option) any later version.
00013  *
00014  * FFmpeg is distributed in the hope that it will be useful,
00015  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00016  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017  * Lesser General Public License for more details.
00018  *
00019  * You should have received a copy of the GNU Lesser General Public
00020  * License along with FFmpeg; if not, write to the Free Software
00021  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00022  */
00023 
00029 #ifndef AVCODEC_MJPEGDEC_H
00030 #define AVCODEC_MJPEGDEC_H
00031 
00032 #include "avcodec.h"
00033 #include "get_bits.h"
00034 #include "dsputil.h"
00035 
00036 #define MAX_COMPONENTS 4
00037 
00038 typedef struct MJpegDecodeContext {
00039     AVCodecContext *avctx;
00040     GetBitContext gb;
00041 
00042     int start_code; /* current start code */
00043     int buffer_size;
00044     uint8_t *buffer;
00045 
00046     int16_t quant_matrixes[4][64];
00047     VLC vlcs[3][4];
00048     int qscale[4];      
00049 
00050     int org_height;  /* size given at codec init */
00051     int first_picture;    /* true if decoding first picture */
00052     int interlaced;     /* true if interlaced */
00053     int bottom_field;   /* true if bottom field */
00054     int lossless;
00055     int ls;
00056     int progressive;
00057     int rgb;
00058     int rct;            /* standard rct */
00059     int pegasus_rct;    /* pegasus reversible colorspace transform */
00060     int bits;           /* bits per component */
00061 
00062     int maxval;
00063     int near;         
00064     int t1,t2,t3;
00065     int reset;        
00066 
00067     int width, height;
00068     int mb_width, mb_height;
00069     int nb_components;
00070     int block_stride[MAX_COMPONENTS];
00071     int component_id[MAX_COMPONENTS];
00072     int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
00073     int v_count[MAX_COMPONENTS];
00074     int comp_index[MAX_COMPONENTS];
00075     int dc_index[MAX_COMPONENTS];
00076     int ac_index[MAX_COMPONENTS];
00077     int nb_blocks[MAX_COMPONENTS];
00078     int h_scount[MAX_COMPONENTS];
00079     int v_scount[MAX_COMPONENTS];
00080     int h_max, v_max; /* maximum h and v counts */
00081     int quant_index[4];   /* quant table index for each component */
00082     int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
00083     AVFrame picture; /* picture structure */
00084     AVFrame *picture_ptr; /* pointer to picture structure */
00085     int got_picture;                                
00086     int linesize[MAX_COMPONENTS];                   
00087     int8_t *qscale_table;
00088     DECLARE_ALIGNED(16, DCTELEM, block)[64];
00089     DCTELEM (*blocks[MAX_COMPONENTS])[64]; 
00090     uint8_t *last_nnz[MAX_COMPONENTS];
00091     uint64_t coefs_finished[MAX_COMPONENTS]; 
00092     ScanTable scantable;
00093     DSPContext dsp;
00094 
00095     int restart_interval;
00096     int restart_count;
00097 
00098     int buggy_avid;
00099     int cs_itu601;
00100     int interlace_polarity;
00101 
00102     int mjpb_skiptosod;
00103 
00104     int cur_scan; /* current scan, used by JPEG-LS */
00105     int flipped; /* true if picture is flipped */
00106 
00107     uint16_t (*ljpeg_buffer)[4];
00108     unsigned int ljpeg_buffer_size;
00109 } MJpegDecodeContext;
00110 
00111 int ff_mjpeg_decode_init(AVCodecContext *avctx);
00112 int ff_mjpeg_decode_end(AVCodecContext *avctx);
00113 int ff_mjpeg_decode_frame(AVCodecContext *avctx,
00114                           void *data, int *data_size,
00115                           AVPacket *avpkt);
00116 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s);
00117 int ff_mjpeg_decode_dht(MJpegDecodeContext *s);
00118 int ff_mjpeg_decode_sof(MJpegDecodeContext *s);
00119 int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
00120                         const uint8_t *mb_bitmask, const AVFrame *reference);
00121 int ff_mjpeg_find_marker(MJpegDecodeContext *s,
00122                          const uint8_t **buf_ptr, const uint8_t *buf_end,
00123                          const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
00124 
00125 #endif /* AVCODEC_MJPEGDEC_H */