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* This file is part of FFmpeg.
* FFmpeg 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.
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Lesser General Public License for more details.
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#include "blockdsp.h"
#include "get_bits.h"
#include "idctdsp.h"
#include "intrax8dsp.h"
#include "wmv2dsp.h"
#include "mpegpicture.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];
WMV2DSPContext wdsp;
uint8_t idct_permutation[64];
AVCodecContext *avctx;
int *block_last_index; ///< last nonzero coefficient in block
int16_t (*block)[64];
// set by the caller codec
IntraX8DSPContext dsp;
IDCTDSPContext idsp;
BlockDSPContext bdsp;
int quant;
int dquant;
int qsum;
int loopfilter;
AVFrame *frame;
GetBitContext *gb;
// calculated per frame
int quant_dc_chroma;
int divide_quant_dc_luma;
int divide_quant_dc_chroma;
uint8_t *dest[3];
uint8_t scratchpad[42]; // size of the block is fixed (8x8 plus padding)
// changed per block
int edges;
int flat_dc;
int predicted_dc;
int raw_orient;
int chroma_orient;
int orient;
int est_run;
// block props
int mb_x, mb_y;
int mb_width, mb_height;
} IntraX8Context;
* Initialize IntraX8 frame decoder.
* @param avctx pointer to AVCodecContext
* @param w pointer to IntraX8Context
* @param idsp pointer to IDCTDSPContext
* @param block pointer to block array
* @param block_last_index pointer to index array
* @param mb_width macroblock width
* @param mb_height macroblock height
* @return 0 on success, a negative AVERROR value on error
int ff_intrax8_common_init(AVCodecContext *avctx,
IntraX8Context *w, IDCTDSPContext *idsp,
int16_t (*block)[64],
int block_last_index[12],
int mb_width, int mb_height);
* Destroy IntraX8 frame structure.
* @param w pointer to IntraX8Context
void ff_intrax8_common_end(IntraX8Context *w);
* Decode single IntraX8 frame.
* lowres decoding is theoretically impossible.
* @param w pointer to IntraX8Context
* @param pict the output Picture containing an AVFrame
* @param gb open bitstream reader
* @param mb_x pointer to the x coordinate of the current macroblock
* @param mb_y pointer to the y coordinate of the current macroblock
* @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
* @param quant_offset offset away from zero
* @param loopfilter enable filter after decoding a block
int ff_intrax8_decode_picture(IntraX8Context *w, Picture *pict,
GetBitContext *gb, int *mb_x, int *mb_y,
int quant, int halfpq,
int loopfilter, int lowdelay);
#endif /* AVCODEC_INTRAX8_H */