mirror of
https://gitee.com/openharmony/third_party_ffmpeg
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131 lines
4.4 KiB
C
131 lines
4.4 KiB
C
/*
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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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "avcodec.h"
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#include "get_bits.h"
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#include "dsputil.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 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 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 intervall ?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 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, DCTELEM, block)[64];
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DCTELEM (*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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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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} 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 *data_size,
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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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