PeerStreamer

/*

 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.

 * Copyright (c) 2006  Stefan Gehrer <stefan.gehrer@gmx.de>

 *

 * 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

 * 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 FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#ifndef AVCODEC_CAVS_H

#define AVCODEC_CAVS_H

#include "dsputil.h"

#include "mpegvideo.h"

#define SLICE_MAX_START_CODE    0x000001af

#define EXT_START_CODE          0x000001b5

#define USER_START_CODE         0x000001b2

#define CAVS_START_CODE         0x000001b0

#define PIC_I_START_CODE        0x000001b3

#define PIC_PB_START_CODE       0x000001b6

#define A_AVAIL                          1

#define B_AVAIL                          2

#define C_AVAIL                          4

#define D_AVAIL                          8

#define NOT_AVAIL                       -1

#define REF_INTRA                       -2

#define REF_DIR                         -3

#define ESCAPE_CODE                     59

#define FWD0                          0x01

#define FWD1                          0x02

#define BWD0                          0x04

#define BWD1                          0x08

#define SYM0                          0x10

#define SYM1                          0x20

#define SPLITH                        0x40

#define SPLITV                        0x80

#define MV_BWD_OFFS                     12

#define MV_STRIDE                        4

enum cavs_mb {

  I_8X8 = 0,

  P_SKIP,

  P_16X16,

  P_16X8,

  P_8X16,

  P_8X8,

  B_SKIP,

  B_DIRECT,

  B_FWD_16X16,

  B_BWD_16X16,

  B_SYM_16X16,

  B_8X8 = 29

};

enum cavs_sub_mb {

  B_SUB_DIRECT,

  B_SUB_FWD,

  B_SUB_BWD,

  B_SUB_SYM

};

enum cavs_intra_luma {

  INTRA_L_VERT,

  INTRA_L_HORIZ,

  INTRA_L_LP,

  INTRA_L_DOWN_LEFT,

  INTRA_L_DOWN_RIGHT,

  INTRA_L_LP_LEFT,

  INTRA_L_LP_TOP,

  INTRA_L_DC_128

};

enum cavs_intra_chroma {

  INTRA_C_LP,

  INTRA_C_HORIZ,

  INTRA_C_VERT,

  INTRA_C_PLANE,

  INTRA_C_LP_LEFT,

  INTRA_C_LP_TOP,

  INTRA_C_DC_128,

};

enum cavs_mv_pred {

  MV_PRED_MEDIAN,

  MV_PRED_LEFT,

  MV_PRED_TOP,

  MV_PRED_TOPRIGHT,

  MV_PRED_PSKIP,

  MV_PRED_BSKIP

};

enum cavs_block {

  BLK_16X16,

  BLK_16X8,

  BLK_8X16,

  BLK_8X8

};

enum cavs_mv_loc {

  MV_FWD_D3 = 0,

  MV_FWD_B2,

  MV_FWD_B3,

  MV_FWD_C2,

  MV_FWD_A1,

  MV_FWD_X0,

  MV_FWD_X1,

  MV_FWD_A3 = 8,

  MV_FWD_X2,

  MV_FWD_X3,

  MV_BWD_D3 = MV_BWD_OFFS,

  MV_BWD_B2,

  MV_BWD_B3,

  MV_BWD_C2,

  MV_BWD_A1,

  MV_BWD_X0,

  MV_BWD_X1,

  MV_BWD_A3 = MV_BWD_OFFS+8,

  MV_BWD_X2,

  MV_BWD_X3

};

DECLARE_ALIGNED_8(typedef, struct) {

    int16_t x;

    int16_t y;

    int16_t dist;

    int16_t ref;

} cavs_vector;

struct dec_2dvlc {

  int8_t rltab[59][3];

  int8_t level_add[27];

  int8_t golomb_order;

  int inc_limit;

  int8_t max_run;

};

typedef struct {

    MpegEncContext s;

    Picture picture; ///< currently decoded frame

    Picture DPB[2];  ///< reference frames

    int dist[2];     ///< temporal distances from current frame to ref frames

    int profile, level;

    int aspect_ratio;

    int mb_width, mb_height;

    int pic_type;

    int stream_revision; ///<0 for samples from 2006, 1 for rm52j encoder

    int progressive;

    int pic_structure;

    int skip_mode_flag; ///< select between skip_count or one skip_flag per MB

    int loop_filter_disable;

    int alpha_offset, beta_offset;

    int ref_flag;

    int mbx, mby, mbidx; ///< macroblock coordinates

    int flags;         ///< availability flags of neighbouring macroblocks

    int stc;           ///< last start code

    uint8_t *cy, *cu, *cv; ///< current MB sample pointers

    int left_qp;

    uint8_t *top_qp;

    /** mv motion vector cache

       0:    D3  B2  B3  C2

       4:    A1  X0  X1   -

       8:    A3  X2  X3   -

       X are the vectors in the current macroblock (5,6,9,10)

       A is the macroblock to the left (4,8)

       B is the macroblock to the top (1,2)

       C is the macroblock to the top-right (3)

       D is the macroblock to the top-left (0)

       the same is repeated for backward motion vectors */

    cavs_vector mv[2*4*3];

    cavs_vector *top_mv[2];

    cavs_vector *col_mv;

    /** luma pred mode cache

       0:    --  B2  B3

       3:    A1  X0  X1

       6:    A3  X2  X3   */

    int pred_mode_Y[3*3];

    int *top_pred_Y;

    int l_stride, c_stride;

    int luma_scan[4];

    int qp;

    int qp_fixed;

    int cbp;

    ScanTable scantable;

    /** intra prediction is done with un-deblocked samples

     they are saved here before deblocking the MB  */

    uint8_t *top_border_y, *top_border_u, *top_border_v;

    uint8_t left_border_y[26], left_border_u[10], left_border_v[10];

    uint8_t intern_border_y[26];

    uint8_t topleft_border_y, topleft_border_u, topleft_border_v;

    void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);

    void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);

    uint8_t *col_type_base;

    /* scaling factors for MV prediction */

    int sym_factor;    ///< for scaling in symmetrical B block

    int direct_den[2]; ///< for scaling in direct B block

    int scale_den[2];  ///< for scaling neighbouring MVs

    int got_keyframe;

    DCTELEM *block;

} AVSContext;

extern const uint8_t     ff_cavs_dequant_shift[64];

extern const uint16_t    ff_cavs_dequant_mul[64];

extern const struct dec_2dvlc ff_cavs_intra_dec[7];

extern const struct dec_2dvlc ff_cavs_inter_dec[7];

extern const struct dec_2dvlc ff_cavs_chroma_dec[5];

extern const uint8_t     ff_cavs_chroma_qp[64];

extern const uint8_t     ff_cavs_scan3x3[4];

extern const uint8_t     ff_cavs_partition_flags[30];

extern const int_fast8_t ff_left_modifier_l[8];

extern const int_fast8_t ff_top_modifier_l[8];

extern const int_fast8_t ff_left_modifier_c[7];

extern const int_fast8_t ff_top_modifier_c[7];

extern const cavs_vector ff_cavs_intra_mv;

extern const cavs_vector ff_cavs_un_mv;

extern const cavs_vector ff_cavs_dir_mv;

static inline void modify_pred(const int_fast8_t *mod_table, int *mode) {

    *mode = mod_table[*mode];

    if(*mode < 0) {

        av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n");

        *mode = 0;

    }

}

static inline void set_intra_mode_default(AVSContext *h) {

    if(h->stream_revision > 0) {

        h->pred_mode_Y[3] =  h->pred_mode_Y[6] = NOT_AVAIL;

        h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = NOT_AVAIL;

    } else {

        h->pred_mode_Y[3] =  h->pred_mode_Y[6] = INTRA_L_LP;

        h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP;

    }

}

static inline void set_mvs(cavs_vector *mv, enum cavs_block size) {

    switch(size) {

    case BLK_16X16:

        mv[MV_STRIDE  ] = mv[0];

        mv[MV_STRIDE+1] = mv[0];

    case BLK_16X8:

        mv[1] = mv[0];

        break;

    case BLK_8X16:

        mv[MV_STRIDE] = mv[0];

        break;

    }

}

static inline void set_mv_intra(AVSContext *h) {

    h->mv[MV_FWD_X0] = ff_cavs_intra_mv;

    set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

    h->mv[MV_BWD_X0] = ff_cavs_intra_mv;

    set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

    if(h->pic_type != FF_B_TYPE)

        h->col_type_base[h->mbidx] = I_8X8;

}

static inline int dequant(AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf,

                          DCTELEM *dst, int mul, int shift, int coeff_num) {

    int round = 1 << (shift - 1);

    int pos = -1;

    const uint8_t *scantab = h->scantable.permutated;

    /* inverse scan and dequantization */

    while(--coeff_num >= 0){

        pos += run_buf[coeff_num];

        if(pos > 63) {

            av_log(h->s.avctx, AV_LOG_ERROR,

                "position out of block bounds at pic %d MB(%d,%d)\n",

                h->picture.poc, h->mbx, h->mby);

            return -1;

        }

        dst[scantab[pos]] = (level_buf[coeff_num]*mul + round) >> shift;

    }

    return 0;

}

void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type);

void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top, uint8_t **left,

                                  int block);

void ff_cavs_load_intra_pred_chroma(AVSContext *h);

void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv);

void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type);

void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,

                enum cavs_mv_pred mode, enum cavs_block size, int ref);

void ff_cavs_init_mb(AVSContext *h);

int  ff_cavs_next_mb(AVSContext *h);

void ff_cavs_init_pic(AVSContext *h);

void ff_cavs_init_top_lines(AVSContext *h);

int ff_cavs_init(AVCodecContext *avctx);

int ff_cavs_end (AVCodecContext *avctx);

#endif /* AVCODEC_CAVS_H */