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/*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_INTRAX8_H
#define AVCODEC_INTRAX8_H
#include "get_bits.h"
#include "mpegvideo.h"
#include "idctdsp.h"
#include "intrax8dsp.h"
typedef struct IntraX8Context {
VLC *j_ac_vlc[4]; // they point to the static j_mb_vlc
VLC *j_orient_vlc;
VLC *j_dc_vlc[3];
int use_quant_matrix;
// set by ff_intrax8_common_init
uint8_t *prediction_table; // 2 * (mb_w * 2)
ScanTable scantable[3];
// set by the caller codec
MpegEncContext *s;
IntraX8DSPContext dsp;
IDCTDSPContext idsp;
int quant;
int dquant;
int qsum;
// calculated per frame
int quant_dc_chroma;
int divide_quant_dc_luma;
int divide_quant_dc_chroma;
uint8_t *dest[3];
// changed per block
int edges;
int flat_dc;
int predicted_dc;
int raw_orient;
int chroma_orient;
int orient;
int est_run;
} IntraX8Context;
/**
* Initialize IntraX8 frame decoder.
* Requires valid MpegEncContext with valid s->mb_width before calling.
* @param w pointer to IntraX8Context
* @param idsp pointer to IDCTDSPContext
* @param s pointer to MpegEncContext of the parent codec
* @return 0 on success, a negative AVERROR value on error
*/
int ff_intrax8_common_init(IntraX8Context *w, IDCTDSPContext *idsp,
MpegEncContext *const s);
/**
* Destroy IntraX8 frame structure.
* @param w pointer to IntraX8Context
*/
void ff_intrax8_common_end(IntraX8Context *w);
/**
* Decode single IntraX8 frame.
* The parent codec must fill s->loopfilter and s->gb (bitstream).
* The parent codec must call ff_mpv_frame_start() before calling this function.
* The parent codec must call ff_mpv_frame_end() after calling this function.
* This function does not use ff_mpv_decode_mb().
* @param w pointer to IntraX8Context
* @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
* @param quant_offset offset away from zero
*/
int ff_intrax8_decode_picture(IntraX8Context *w, int quant, int halfpq);
#endif /* AVCODEC_INTRAX8_H */
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