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142 lines
4.7 KiB
142 lines
4.7 KiB
/* |
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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 |
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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 "libavutil/log.h" |
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#include "libavutil/pixdesc.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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#include "hpeldsp.h" |
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#define MAX_COMPONENTS 4 |
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typedef struct MJpegDecodeContext { |
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AVClass *class; |
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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[3][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 upscale_h; |
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int chroma_height; |
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int upscale_v; |
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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 colr; |
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int xfrm; |
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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 interval ?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 quant_sindex[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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AVFrame *picture_ptr; /* pointer to 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, int16_t, block)[64]; |
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int16_t (*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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HpelDSPContext hdsp; |
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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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int extern_huff; |
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AVDictionary *exif_metadata; |
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const AVPixFmtDescriptor *pix_desc; |
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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 *got_frame, |
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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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const uint8_t *mb_bitmask, const AVFrame *reference); |
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int ff_mjpeg_find_marker(MJpegDecodeContext *s, |
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const uint8_t **buf_ptr, const uint8_t *buf_end, |
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const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size); |
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#endif /* AVCODEC_MJPEGDEC_H */
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