libavcodec/intrax8.h

   1 /*
   2  * This file is part of FFmpeg.
   3  *
   4  * FFmpeg is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * FFmpeg is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with FFmpeg; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #ifndef AVCODEC_INTRAX8_H
  20 #define AVCODEC_INTRAX8_H
  21
  22 #include "blockdsp.h"
  23 #include "get_bits.h"
  24 #include "intrax8dsp.h"
  25 #include "wmv2dsp.h"
  26 #include "mpegpicture.h"
  27
  28 typedef struct IntraX8Context {
  29     const VLCElem *j_ac_vlc_table[4]; // they point to the static j_mb_vlc.table
  30     const VLCElem *j_orient_vlc_table;
  31     const VLCElem *j_dc_vlc_table[3];
  32
  33     int use_quant_matrix;
  34
  35     // set by ff_intrax8_common_init
  36     uint8_t *prediction_table; // 2 * (mb_w * 2)
  37     uint8_t permutated_scantable[3][64];
  38     WMV2DSPContext wdsp;
  39     uint8_t idct_permutation[64];
  40     AVCodecContext *avctx;
  41     int *block_last_index;  ///< last nonzero coefficient in block
  42     int16_t (*block)[64];
  43
  44     // set by the caller codec
  45     IntraX8DSPContext dsp;
  46     BlockDSPContext bdsp;
  47     int quant;
  48     int dquant;
  49     int qsum;
  50     int loopfilter;
  51     AVFrame *frame;
  52     GetBitContext *gb;
  53
  54     // calculated per frame
  55     int quant_dc_chroma;
  56     int divide_quant_dc_luma;
  57     int divide_quant_dc_chroma;
  58     uint8_t *dest[3];
  59     uint8_t scratchpad[42]; // size of the block is fixed (8x8 plus padding)
  60
  61     // changed per block
  62     int edges;
  63     int flat_dc;
  64     int predicted_dc;
  65     int raw_orient;
  66     int chroma_orient;
  67     int orient;
  68     int est_run;
  69
  70     // block props
  71     int mb_x, mb_y;
  72     int mb_width, mb_height;
  73 } IntraX8Context;
  74
  75 /**
  76  * Initialize IntraX8 frame decoder.
  77  * @param avctx pointer to AVCodecContext
  78  * @param w pointer to IntraX8Context
  79  * @param block pointer to block array
  80  * @param block_last_index pointer to index array
  81  * @param mb_width macroblock width
  82  * @param mb_height macroblock height
  83  * @return 0 on success, a negative AVERROR value on error
  84  */
  85 int ff_intrax8_common_init(AVCodecContext *avctx,
  86                            IntraX8Context *w,
  87                            int16_t (*block)[64],
  88                            int block_last_index[12],
  89                            int mb_width, int mb_height);
  90
  91 /**
  92  * Destroy IntraX8 frame structure.
  93  * @param w pointer to IntraX8Context
  94  */
  95 void ff_intrax8_common_end(IntraX8Context *w);
  96
  97 /**
  98  * Decode single IntraX8 frame.
  99  * lowres decoding is theoretically impossible.
 100  * @param w pointer to IntraX8Context
 101  * @param pict the output Picture containing an AVFrame
 102  * @param gb open bitstream reader
 103  * @param mb_x pointer to the x coordinate of the current macroblock
 104  * @param mb_y pointer to the y coordinate of the current macroblock
 105  * @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
 106  * @param quant_offset offset away from zero
 107  * @param loopfilter enable filter after decoding a block
 108  */
 109 int ff_intrax8_decode_picture(IntraX8Context *w, MPVPicture *pict,
 110                               GetBitContext *gb, int *mb_x, int *mb_y,
 111                               int quant, int halfpq,
 112                               int loopfilter, int lowdelay);
 113
 114 #endif /* AVCODEC_INTRAX8_H */