118 lines
3.6 KiB
C
118 lines
3.6 KiB
C
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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_INTRAX8_H
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#define AVCODEC_INTRAX8_H
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#include "blockdsp.h"
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#include "get_bits.h"
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#include "idctdsp.h"
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#include "intrax8dsp.h"
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#include "wmv2dsp.h"
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#include "mpegpicture.h"
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typedef struct IntraX8Context {
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VLC *j_ac_vlc[4]; // they point to the static j_mb_vlc
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VLC *j_orient_vlc;
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VLC *j_dc_vlc[3];
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int use_quant_matrix;
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// set by ff_intrax8_common_init
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uint8_t *prediction_table; // 2 * (mb_w * 2)
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ScanTable scantable[3];
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WMV2DSPContext wdsp;
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uint8_t idct_permutation[64];
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AVCodecContext *avctx;
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int *block_last_index; ///< last nonzero coefficient in block
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int16_t (*block)[64];
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// set by the caller codec
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IntraX8DSPContext dsp;
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IDCTDSPContext idsp;
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BlockDSPContext bdsp;
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int quant;
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int dquant;
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int qsum;
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int loopfilter;
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AVFrame *frame;
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GetBitContext *gb;
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// calculated per frame
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int quant_dc_chroma;
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int divide_quant_dc_luma;
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int divide_quant_dc_chroma;
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uint8_t *dest[3];
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uint8_t scratchpad[42]; // size of the block is fixed (8x8 plus padding)
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// changed per block
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int edges;
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int flat_dc;
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int predicted_dc;
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int raw_orient;
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int chroma_orient;
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int orient;
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int est_run;
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// block props
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int mb_x, mb_y;
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int mb_width, mb_height;
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} IntraX8Context;
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/**
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* Initialize IntraX8 frame decoder.
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* @param avctx pointer to AVCodecContext
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* @param w pointer to IntraX8Context
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* @param idsp pointer to IDCTDSPContext
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* @param block pointer to block array
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* @param block_last_index pointer to index array
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* @param mb_width macroblock width
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* @param mb_height macroblock height
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* @return 0 on success, a negative AVERROR value on error
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*/
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int ff_intrax8_common_init(AVCodecContext *avctx,
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IntraX8Context *w, IDCTDSPContext *idsp,
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int16_t (*block)[64],
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int block_last_index[12],
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int mb_width, int mb_height);
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/**
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* Destroy IntraX8 frame structure.
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* @param w pointer to IntraX8Context
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*/
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void ff_intrax8_common_end(IntraX8Context *w);
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/**
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* Decode single IntraX8 frame.
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* lowres decoding is theoretically impossible.
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* @param w pointer to IntraX8Context
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* @param pict the output Picture containing an AVFrame
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* @param gb open bitstream reader
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* @param mb_x pointer to the x coordinate of the current macroblock
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* @param mb_y pointer to the y coordinate of the current macroblock
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* @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
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* @param quant_offset offset away from zero
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* @param loopfilter enable filter after decoding a block
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*/
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int ff_intrax8_decode_picture(IntraX8Context *w, Picture *pict,
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GetBitContext *gb, int *mb_x, int *mb_y,
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int quant, int halfpq,
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int loopfilter, int lowdelay);
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#endif /* AVCODEC_INTRAX8_H */
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