| 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 |
| 26 | * MJPEG decoder. |
| 27 | */ |
| 28 | |
| 29 | #ifndef AVCODEC_MJPEGDEC_H |
| 30 | #define AVCODEC_MJPEGDEC_H |
| 31 | |
| 32 | #include "libavutil/log.h" |
| 33 | #include "libavutil/pixdesc.h" |
| 34 | #include "libavutil/stereo3d.h" |
| 35 | |
| 36 | #include "avcodec.h" |
| 37 | #include "blockdsp.h" |
| 38 | #include "get_bits.h" |
| 39 | #include "hpeldsp.h" |
| 40 | #include "idctdsp.h" |
| 41 | |
| 42 | #define MAX_COMPONENTS 4 |
| 43 | |
| 44 | typedef struct MJpegDecodeContext { |
| 45 | AVClass *class; |
| 46 | AVCodecContext *avctx; |
| 47 | GetBitContext gb; |
| 48 | |
| 49 | int start_code; /* current start code */ |
| 50 | int buffer_size; |
| 51 | uint8_t *buffer; |
| 52 | |
| 53 | int16_t quant_matrixes[4][64]; |
| 54 | VLC vlcs[3][4]; |
| 55 | int qscale[4]; ///< quantizer scale calculated from quant_matrixes |
| 56 | |
| 57 | int org_height; /* size given at codec init */ |
| 58 | int first_picture; /* true if decoding first picture */ |
| 59 | int interlaced; /* true if interlaced */ |
| 60 | int bottom_field; /* true if bottom field */ |
| 61 | int lossless; |
| 62 | int ls; |
| 63 | int progressive; |
| 64 | int rgb; |
| 65 | int upscale_h; |
| 66 | int upscale_v; |
| 67 | int rct; /* standard rct */ |
| 68 | int pegasus_rct; /* pegasus reversible colorspace transform */ |
| 69 | int bits; /* bits per component */ |
| 70 | int colr; |
| 71 | int xfrm; |
| 72 | int adobe_transform; |
| 73 | |
| 74 | int maxval; |
| 75 | int near; ///< near lossless bound (si 0 for lossless) |
| 76 | int t1,t2,t3; |
| 77 | int reset; ///< context halfing interval ?rename |
| 78 | |
| 79 | int width, height; |
| 80 | int mb_width, mb_height; |
| 81 | int nb_components; |
| 82 | int block_stride[MAX_COMPONENTS]; |
| 83 | int component_id[MAX_COMPONENTS]; |
| 84 | int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */ |
| 85 | int v_count[MAX_COMPONENTS]; |
| 86 | int comp_index[MAX_COMPONENTS]; |
| 87 | int dc_index[MAX_COMPONENTS]; |
| 88 | int ac_index[MAX_COMPONENTS]; |
| 89 | int nb_blocks[MAX_COMPONENTS]; |
| 90 | int h_scount[MAX_COMPONENTS]; |
| 91 | int v_scount[MAX_COMPONENTS]; |
| 92 | int quant_sindex[MAX_COMPONENTS]; |
| 93 | int h_max, v_max; /* maximum h and v counts */ |
| 94 | int quant_index[4]; /* quant table index for each component */ |
| 95 | int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */ |
| 96 | AVFrame *picture; /* picture structure */ |
| 97 | AVFrame *picture_ptr; /* pointer to picture structure */ |
| 98 | int got_picture; ///< we found a SOF and picture is valid, too. |
| 99 | int linesize[MAX_COMPONENTS]; ///< linesize << interlaced |
| 100 | int8_t *qscale_table; |
| 101 | DECLARE_ALIGNED(16, int16_t, block)[64]; |
| 102 | int16_t (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode) |
| 103 | uint8_t *last_nnz[MAX_COMPONENTS]; |
| 104 | uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode) |
| 105 | int palette_index; |
| 106 | ScanTable scantable; |
| 107 | BlockDSPContext bdsp; |
| 108 | HpelDSPContext hdsp; |
| 109 | IDCTDSPContext idsp; |
| 110 | |
| 111 | int restart_interval; |
| 112 | int restart_count; |
| 113 | |
| 114 | int buggy_avid; |
| 115 | int cs_itu601; |
| 116 | int interlace_polarity; |
| 117 | |
| 118 | int mjpb_skiptosod; |
| 119 | |
| 120 | int cur_scan; /* current scan, used by JPEG-LS */ |
| 121 | int flipped; /* true if picture is flipped */ |
| 122 | |
| 123 | uint16_t (*ljpeg_buffer)[4]; |
| 124 | unsigned int ljpeg_buffer_size; |
| 125 | |
| 126 | int extern_huff; |
| 127 | AVDictionary *exif_metadata; |
| 128 | |
| 129 | AVStereo3D *stereo3d; ///!< stereoscopic information (cached, since it is read before frame allocation) |
| 130 | |
| 131 | const AVPixFmtDescriptor *pix_desc; |
| 132 | } MJpegDecodeContext; |
| 133 | |
| 134 | int ff_mjpeg_decode_init(AVCodecContext *avctx); |
| 135 | int ff_mjpeg_decode_end(AVCodecContext *avctx); |
| 136 | int ff_mjpeg_decode_frame(AVCodecContext *avctx, |
| 137 | void *data, int *got_frame, |
| 138 | AVPacket *avpkt); |
| 139 | int ff_mjpeg_decode_dqt(MJpegDecodeContext *s); |
| 140 | int ff_mjpeg_decode_dht(MJpegDecodeContext *s); |
| 141 | int ff_mjpeg_decode_sof(MJpegDecodeContext *s); |
| 142 | int ff_mjpeg_decode_sos(MJpegDecodeContext *s, |
| 143 | const uint8_t *mb_bitmask,int mb_bitmask_size, |
| 144 | const AVFrame *reference); |
| 145 | int ff_mjpeg_find_marker(MJpegDecodeContext *s, |
| 146 | const uint8_t **buf_ptr, const uint8_t *buf_end, |
| 147 | const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size); |
| 148 | |
| 149 | #endif /* AVCODEC_MJPEGDEC_H */ |