libavcodec/intrax8.h

   1 /*
   2  * This file is part of Libav.
   3  *
   4  * Libav 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  * Libav 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 Libav; 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 "idctdsp.h"
  25 #include "intrax8dsp.h"
  26 #include "mpegpicture.h"
  27
  28 typedef struct IntraX8Context {
  29     VLC *j_ac_vlc[4]; // they point to the static j_mb_vlc
  30     VLC *j_orient_vlc;
  31     VLC *j_dc_vlc[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     ScanTable scantable[3];
  38     AVCodecContext *avctx;
  39     int *block_last_index;  ///< last nonzero coefficient in block
  40     int16_t (*block)[64];
  41
  42     // set by the caller codec
  43     IntraX8DSPContext dsp;
  44     IDCTDSPContext idsp;
  45     BlockDSPContext bdsp;
  46     int quant;
  47     int dquant;
  48     int qsum;
  49     int loopfilter;
  50     AVFrame *frame;
  51     GetBitContext *gb;
  52
  53     // calculated per frame
  54     int quant_dc_chroma;
  55     int divide_quant_dc_luma;
  56     int divide_quant_dc_chroma;
  57     uint8_t *dest[3];
  58     uint8_t scratchpad[42]; // size of the block is fixed (8x8 plus padding)
  59
  60     // changed per block
  61     int edges;
  62     int flat_dc;
  63     int predicted_dc;
  64     int raw_orient;
  65     int chroma_orient;
  66     int orient;
  67     int est_run;
  68
  69     // block props
  70     int mb_x, mb_y;
  71     int mb_width, mb_height;
  72 } IntraX8Context;
  73
  74 /**
  75  * Initialize IntraX8 frame decoder.
  76  * @param avctx pointer to AVCodecContext
  77  * @param w pointer to IntraX8Context
  78  * @param idsp pointer to IDCTDSPContext
  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, IDCTDSPContext *idsp,
  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  * @param w pointer to IntraX8Context
 100  * @param pict the output Picture containing an AVFrame
 101  * @param gb open bitstream reader
 102  * @param mb_x pointer to the x coordinate of the current macroblock
 103  * @param mb_y pointer to the y coordinate of the current macroblock
 104  * @param dquant doubled quantizer, it would be odd in case of VC-1 halfpq==1.
 105  * @param quant_offset offset away from zero
 106  * @param loopfilter enable filter after decoding a block
 107  */
 108 int ff_intrax8_decode_picture(IntraX8Context *w, Picture *pict,
 109                               GetBitContext *gb, int *mb_x, int *mb_y,
 110                               int quant, int halfpq,
 111                               int loopfilter, int lowdelay);
 112
 113 #endif /* AVCODEC_INTRAX8_H */