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 "bitstream.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[2][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 int linesize[MAX_COMPONENTS]; 00085 int8_t *qscale_table; 00086 DECLARE_ALIGNED_16(DCTELEM, block[64]); 00087 DCTELEM (*blocks[MAX_COMPONENTS])[64]; 00088 uint8_t *last_nnz[MAX_COMPONENTS]; 00089 uint64_t coefs_finished[MAX_COMPONENTS]; 00090 ScanTable scantable; 00091 DSPContext dsp; 00092 00093 int restart_interval; 00094 int restart_count; 00095 00096 int buggy_avid; 00097 int cs_itu601; 00098 int interlace_polarity; 00099 00100 int mjpb_skiptosod; 00101 00102 int cur_scan; /* current scan, used by JPEG-LS */ 00103 } MJpegDecodeContext; 00104 00105 int ff_mjpeg_decode_init(AVCodecContext *avctx); 00106 int ff_mjpeg_decode_end(AVCodecContext *avctx); 00107 int ff_mjpeg_decode_frame(AVCodecContext *avctx, 00108 void *data, int *data_size, 00109 const uint8_t *buf, int buf_size); 00110 int ff_mjpeg_decode_dqt(MJpegDecodeContext *s); 00111 int ff_mjpeg_decode_dht(MJpegDecodeContext *s); 00112 int ff_mjpeg_decode_sof(MJpegDecodeContext *s); 00113 int ff_mjpeg_decode_sos(MJpegDecodeContext *s); 00114 00115 #endif /* AVCODEC_MJPEGDEC_H */