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930e560da3
These packets need not be writable, so we must not modify them. Reviewed-by: Paul B Mahol <onemda@gmail.com> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
89 lines
2.0 KiB
C
89 lines
2.0 KiB
C
/*
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* Canopus HQX decoder
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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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#ifndef AVCODEC_HQX_H
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#define AVCODEC_HQX_H
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#include <stdint.h>
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#include "libavutil/frame.h"
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#include "libavutil/mem_internal.h"
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#include "get_bits.h"
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#include "hqxdsp.h"
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enum HQXACMode {
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HQX_AC_Q0 = 0,
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HQX_AC_Q8,
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HQX_AC_Q16,
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HQX_AC_Q32,
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HQX_AC_Q64,
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HQX_AC_Q128,
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NUM_HQX_AC
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};
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typedef struct HQXLUT {
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int16_t lev;
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uint8_t run;
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int8_t bits;
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} HQXLUT;
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typedef struct HQXAC {
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int lut_bits, extra_bits;
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const HQXLUT *lut;
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} HQXAC;
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struct HQXContext;
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typedef int (*mb_decode_func)(struct HQXContext *ctx,
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int slice_no, int x, int y);
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typedef struct HQXSlice {
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GetBitContext gb;
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DECLARE_ALIGNED(16, int16_t, block)[16][64];
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} HQXSlice;
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typedef struct HQXContext {
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HQXDSPContext hqxdsp;
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HQXSlice slice[16];
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AVFrame *pic;
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mb_decode_func decode_func;
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int format, dcb, width, height;
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int interlaced;
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const uint8_t *src;
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unsigned int data_size;
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uint32_t slice_off[17];
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VLC cbp_vlc;
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VLC dc_vlc[3];
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} HQXContext;
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#define HQX_CBP_VLC_BITS 5
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#define HQX_DC_VLC_BITS 9
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extern const HQXAC ff_hqx_ac[NUM_HQX_AC];
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int ff_hqx_init_vlcs(HQXContext *ctx);
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#endif /* AVCODEC_HQX_H */
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