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FFmpeg/libavcodec/cavs.c

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  1. /*

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

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

  4.  *

  5.  * This library is free software; you can redistribute it and/or

  6.  * modify it under the terms of the GNU Lesser General Public

  7.  * License as published by the Free Software Foundation; either

  8.  * version 2 of the License, or (at your option) any later version.

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  13.  * Lesser General Public License for more details.

  14.  *

  15.  * You should have received a copy of the GNU Lesser General Public

  16.  * License along with this library; if not, write to the Free Software

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

  18.  */

  19. 

  20. /**

  21.  * @file cavs.c

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

  23.  * @author Stefan Gehrer <stefan.gehrer@gmx.de>

  24.  */

  25. 

  26. #include "avcodec.h"

  27. #include "bitstream.h"

  28. #include "golomb.h"

  29. #include "mpegvideo.h"

  30. #include "cavsdata.h"

  31. 

  32. typedef struct {

  33.     MpegEncContext s;

  34.     Picture picture; ///< currently decoded frame

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

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

  37.     int profile, level;

  38.     int aspect_ratio;

  39.     int mb_width, mb_height;

  40.     int pic_type;

  41.     int progressive;

  42.     int pic_structure;

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

  44.     int loop_filter_disable;

  45.     int alpha_offset, beta_offset;

  46.     int ref_flag;

  47.     int mbx, mby;      ///< macroblock coordinates

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

  49.     int stc;           ///< last start code

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

  51.     int left_qp;

  52.     uint8_t *top_qp;

  53. 

  54.     /** mv motion vector cache

  55.        0:    D3  B2  B3  C2

  56.        4:    A1  X0  X1   -

  57.        8:    A3  X2  X3   -

  58. 

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

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

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

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

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

  64. 

  65.        the same is repeated for backward motion vectors */

  66.     vector_t mv[2*4*3];

  67.     vector_t *top_mv[2];

  68.     vector_t *col_mv;

  69. 

  70.     /** luma pred mode cache

  71.        0:    --  B2  B3

  72.        3:    A1  X0  X1

  73.        6:    A3  X2  X3   */

  74.     int pred_mode_Y[3*3];

  75.     int *top_pred_Y;

  76.     int l_stride, c_stride;

  77.     int luma_scan[4];

  78.     int qp;

  79.     int qp_fixed;

  80.     int cbp;

  81.     ScanTable scantable;

  82. 

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

  84.      they are saved here before deblocking the MB  */

  85.     uint8_t *top_border_y, *top_border_u, *top_border_v;

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

  87.     uint8_t intern_border_y[26];

  88.     uint8_t topleft_border_y, topleft_border_u, topleft_border_v;

  89. 

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

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

  92.     uint8_t *col_type_base;

  93.     uint8_t *col_type;

  94. 

  95.     /* scaling factors for MV prediction */

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

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

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

  99. 

  100.     int got_keyframe;

  101.     DCTELEM *block;

  102. } AVSContext;

  103. 

  104. /*****************************************************************************

  105.  *

  106.  * in-loop deblocking filter

  107.  *

  108.  ****************************************************************************/

  109. 

  110. static inline int get_bs(vector_t *mvP, vector_t *mvQ, int b) {

  111.     if((mvP->ref == REF_INTRA) || (mvQ->ref == REF_INTRA))

  112.         return 2;

  113.     if( (abs(mvP->x - mvQ->x) >= 4) ||  (abs(mvP->y - mvQ->y) >= 4) )

  114.         return 1;

  115.     if(b){

  116.         mvP += MV_BWD_OFFS;

  117.         mvQ += MV_BWD_OFFS;

  118.         if( (abs(mvP->x - mvQ->x) >= 4) ||  (abs(mvP->y - mvQ->y) >= 4) )

  119.             return 1;

  120.     }else{

  121.         if(mvP->ref != mvQ->ref)

  122.             return 1;

  123.     }

  124.     return 0;

  125. }

  126. 

  127. #define SET_PARAMS                                            \

  128.     alpha = alpha_tab[clip(qp_avg + h->alpha_offset,0,63)];   \

  129.     beta  =  beta_tab[clip(qp_avg + h->beta_offset, 0,63)];   \

  130.     tc    =    tc_tab[clip(qp_avg + h->alpha_offset,0,63)];

  131. 

  132. /**

  133.  * in-loop deblocking filter for a single macroblock

  134.  *

  135.  * boundary strength (bs) mapping:

  136.  *

  137.  * --4---5--

  138.  * 0   2   |

  139.  * | 6 | 7 |

  140.  * 1   3   |

  141.  * ---------

  142.  *

  143.  */

  144. static void filter_mb(AVSContext *h, enum mb_t mb_type) {

  145.     DECLARE_ALIGNED_8(uint8_t, bs[8]);

  146.     int qp_avg, alpha, beta, tc;

  147.     int i;

  148. 

  149.     /* save un-deblocked lines */

  150.     h->topleft_border_y = h->top_border_y[h->mbx*16+15];

  151.     h->topleft_border_u = h->top_border_u[h->mbx*10+8];

  152.     h->topleft_border_v = h->top_border_v[h->mbx*10+8];

  153.     memcpy(&h->top_border_y[h->mbx*16], h->cy + 15* h->l_stride,16);

  154.     memcpy(&h->top_border_u[h->mbx*10+1], h->cu +  7* h->c_stride,8);

  155.     memcpy(&h->top_border_v[h->mbx*10+1], h->cv +  7* h->c_stride,8);

  156.     for(i=0;i<8;i++) {

  157.         h->left_border_y[i*2+1] = *(h->cy + 15 + (i*2+0)*h->l_stride);

  158.         h->left_border_y[i*2+2] = *(h->cy + 15 + (i*2+1)*h->l_stride);

  159.         h->left_border_u[i+1] = *(h->cu + 7 + i*h->c_stride);

  160.         h->left_border_v[i+1] = *(h->cv + 7 + i*h->c_stride);

  161.     }

  162.     if(!h->loop_filter_disable) {

  163.         /* determine bs */

  164.         if(mb_type == I_8X8)

  165.             *((uint64_t *)bs) = 0x0202020202020202ULL;

  166.         else{

  167.             *((uint64_t *)bs) = 0;

  168.             if(partition_flags[mb_type] & SPLITV){

  169.                 bs[2] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1], mb_type > P_8X8);

  170.                 bs[3] = get_bs(&h->mv[MV_FWD_X2], &h->mv[MV_FWD_X3], mb_type > P_8X8);

  171.             }

  172.             if(partition_flags[mb_type] & SPLITH){

  173.                 bs[6] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2], mb_type > P_8X8);

  174.                 bs[7] = get_bs(&h->mv[MV_FWD_X1], &h->mv[MV_FWD_X3], mb_type > P_8X8);

  175.             }

  176.             bs[0] = get_bs(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0], mb_type > P_8X8);

  177.             bs[1] = get_bs(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2], mb_type > P_8X8);

  178.             bs[4] = get_bs(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0], mb_type > P_8X8);

  179.             bs[5] = get_bs(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1], mb_type > P_8X8);

  180.         }

  181.         if( *((uint64_t *)bs) ) {

  182.             if(h->flags & A_AVAIL) {

  183.                 qp_avg = (h->qp + h->left_qp + 1) >> 1;

  184.                 SET_PARAMS;

  185.                 h->s.dsp.cavs_filter_lv(h->cy,h->l_stride,alpha,beta,tc,bs[0],bs[1]);

  186.                 h->s.dsp.cavs_filter_cv(h->cu,h->c_stride,alpha,beta,tc,bs[0],bs[1]);

  187.                 h->s.dsp.cavs_filter_cv(h->cv,h->c_stride,alpha,beta,tc,bs[0],bs[1]);

  188.             }

  189.             qp_avg = h->qp;

  190.             SET_PARAMS;

  191.             h->s.dsp.cavs_filter_lv(h->cy + 8,h->l_stride,alpha,beta,tc,bs[2],bs[3]);

  192.             h->s.dsp.cavs_filter_lh(h->cy + 8*h->l_stride,h->l_stride,alpha,beta,tc,

  193.                            bs[6],bs[7]);

  194. 

  195.             if(h->flags & B_AVAIL) {

  196.                 qp_avg = (h->qp + h->top_qp[h->mbx] + 1) >> 1;

  197.                 SET_PARAMS;

  198.                 h->s.dsp.cavs_filter_lh(h->cy,h->l_stride,alpha,beta,tc,bs[4],bs[5]);

  199.                 h->s.dsp.cavs_filter_ch(h->cu,h->c_stride,alpha,beta,tc,bs[4],bs[5]);

  200.                 h->s.dsp.cavs_filter_ch(h->cv,h->c_stride,alpha,beta,tc,bs[4],bs[5]);

  201.             }

  202.         }

  203.     }

  204.     h->left_qp = h->qp;

  205.     h->top_qp[h->mbx] = h->qp;

  206. }

  207. 

  208. #undef SET_PARAMS

  209. 

  210. /*****************************************************************************

  211.  *

  212.  * spatial intra prediction

  213.  *

  214.  ****************************************************************************/

  215. 

  216. static inline void load_intra_pred_luma(AVSContext *h, uint8_t *top,

  217.                                         uint8_t **left, int block) {

  218.     int i;

  219. 

  220.     switch(block) {

  221.     case 0:

  222.         *left = h->left_border_y;

  223.         h->left_border_y[0] = h->left_border_y[1];

  224.         memset(&h->left_border_y[17],h->left_border_y[16],9);

  225.         memcpy(&top[1],&h->top_border_y[h->mbx*16],16);

  226.         top[17] = top[16];

  227.         top[0] = top[1];

  228.         if((h->flags & A_AVAIL) && (h->flags & B_AVAIL))

  229.             h->left_border_y[0] = top[0] = h->topleft_border_y;

  230.         break;

  231.     case 1:

  232.         *left = h->intern_border_y;

  233.         for(i=0;i<8;i++)

  234.             h->intern_border_y[i+1] = *(h->cy + 7 + i*h->l_stride);

  235.         memset(&h->intern_border_y[9],h->intern_border_y[8],9);

  236.         h->intern_border_y[0] = h->intern_border_y[1];

  237.         memcpy(&top[1],&h->top_border_y[h->mbx*16+8],8);

  238.         if(h->flags & C_AVAIL)

  239.             memcpy(&top[9],&h->top_border_y[(h->mbx + 1)*16],8);

  240.         else

  241.             memset(&top[9],top[8],9);

  242.         top[17] = top[16];

  243.         top[0] = top[1];

  244.         if(h->flags & B_AVAIL)

  245.             h->intern_border_y[0] = top[0] = h->top_border_y[h->mbx*16+7];

  246.         break;

  247.     case 2:

  248.         *left = &h->left_border_y[8];

  249.         memcpy(&top[1],h->cy + 7*h->l_stride,16);

  250.         top[17] = top[16];

  251.         top[0] = top[1];

  252.         if(h->flags & A_AVAIL)

  253.             top[0] = h->left_border_y[8];

  254.         break;

  255.     case 3:

  256.         *left = &h->intern_border_y[8];

  257.         for(i=0;i<8;i++)

  258.             h->intern_border_y[i+9] = *(h->cy + 7 + (i+8)*h->l_stride);

  259.         memset(&h->intern_border_y[17],h->intern_border_y[16],9);

  260.         memcpy(&top[0],h->cy + 7 + 7*h->l_stride,9);

  261.         memset(&top[9],top[8],9);

  262.         break;

  263.     }

  264. }

  265. 

  266. static void intra_pred_vert(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {

  267.     int y;

  268.     uint64_t a = unaligned64(&top[1]);

  269.     for(y=0;y<8;y++) {

  270.         *((uint64_t *)(d+y*stride)) = a;

  271.     }

  272. }

  273. 

  274. static void intra_pred_horiz(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {

  275.     int y;

  276.     uint64_t a;

  277.     for(y=0;y<8;y++) {

  278.         a = left[y+1] * 0x0101010101010101ULL;

  279.         *((uint64_t *)(d+y*stride)) = a;

  280.     }

  281. }

  282. 

  283. static void intra_pred_dc_128(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {

  284.     int y;

  285.     uint64_t a = 0x8080808080808080ULL;

  286.     for(y=0;y<8;y++)

  287.         *((uint64_t *)(d+y*stride)) = a;

  288. }

  289. 

  290. static void intra_pred_plane(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {

  291.     int x,y,ia;

  292.     int ih = 0;

  293.     int iv = 0;

  294.     uint8_t *cm = cropTbl + MAX_NEG_CROP;

  295. 

  296.     for(x=0; x<4; x++) {

  297.         ih += (x+1)*(top[5+x]-top[3-x]);

  298.         iv += (x+1)*(left[5+x]-left[3-x]);

  299.     }

  300.     ia = (top[8]+left[8])<<4;

  301.     ih = (17*ih+16)>>5;

  302.     iv = (17*iv+16)>>5;

  303.     for(y=0; y<8; y++)

  304.         for(x=0; x<8; x++)

  305.             d[y*stride+x] = cm[(ia+(x-3)*ih+(y-3)*iv+16)>>5];

  306. }

  307. 

  308. #define LOWPASS(ARRAY,INDEX)                                            \

  309.     (( ARRAY[(INDEX)-1] + 2*ARRAY[(INDEX)] + ARRAY[(INDEX)+1] + 2) >> 2)

  310. 

  311. static void intra_pred_lp(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {

  312.     int x,y;

  313.     for(y=0; y<8; y++)

  314.         for(x=0; x<8; x++)

  315.             d[y*stride+x] = (LOWPASS(top,x+1) + LOWPASS(left,y+1)) >> 1;

  316. }

  317. 

  318. static void intra_pred_down_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {

  319.     int x,y;

  320.     for(y=0; y<8; y++)

  321.         for(x=0; x<8; x++)

  322.             d[y*stride+x] = (LOWPASS(top,x+y+2) + LOWPASS(left,x+y+2)) >> 1;

  323. }

  324. 

  325. static void intra_pred_down_right(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {

  326.     int x,y;

  327.     for(y=0; y<8; y++)

  328.         for(x=0; x<8; x++)

  329.             if(x==y)

  330.                 d[y*stride+x] = (left[1]+2*top[0]+top[1]+2)>>2;

  331.             else if(x>y)

  332.                 d[y*stride+x] = LOWPASS(top,x-y);

  333.             else

  334.                 d[y*stride+x] = LOWPASS(left,y-x);

  335. }

  336. 

  337. static void intra_pred_lp_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {

  338.     int x,y;

  339.     for(y=0; y<8; y++)

  340.         for(x=0; x<8; x++)

  341.             d[y*stride+x] = LOWPASS(left,y+1);

  342. }

  343. 

  344. static void intra_pred_lp_top(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {

  345.     int x,y;

  346.     for(y=0; y<8; y++)

  347.         for(x=0; x<8; x++)

  348.             d[y*stride+x] = LOWPASS(top,x+1);

  349. }

  350. 

  351. #undef LOWPASS

  352. 

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

  354.     *mode = mod_table[*mode];

  355.     if(*mode < 0) {

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

  357.         *mode = 0;

  358.     }

  359. }

  360. 

  361. /*****************************************************************************

  362.  *

  363.  * motion compensation

  364.  *

  365.  ****************************************************************************/

  366. 

  367. static inline void mc_dir_part(AVSContext *h,Picture *pic,int square,

  368.                         int chroma_height,int delta,int list,uint8_t *dest_y,

  369.                         uint8_t *dest_cb,uint8_t *dest_cr,int src_x_offset,

  370.                         int src_y_offset,qpel_mc_func *qpix_op,

  371.                         h264_chroma_mc_func chroma_op,vector_t *mv){

  372.     MpegEncContext * const s = &h->s;

  373.     const int mx= mv->x + src_x_offset*8;

  374.     const int my= mv->y + src_y_offset*8;

  375.     const int luma_xy= (mx&3) + ((my&3)<<2);

  376.     uint8_t * src_y = pic->data[0] + (mx>>2) + (my>>2)*h->l_stride;

  377.     uint8_t * src_cb= pic->data[1] + (mx>>3) + (my>>3)*h->c_stride;

  378.     uint8_t * src_cr= pic->data[2] + (mx>>3) + (my>>3)*h->c_stride;

  379.     int extra_width= 0; //(s->flags&CODEC_FLAG_EMU_EDGE) ? 0 : 16;

  380.     int extra_height= extra_width;

  381.     int emu=0;

  382.     const int full_mx= mx>>2;

  383.     const int full_my= my>>2;

  384.     const int pic_width  = 16*h->mb_width;

  385.     const int pic_height = 16*h->mb_height;

  386. 

  387.     if(!pic->data[0])

  388.         return;

  389.     if(mx&7) extra_width -= 3;

  390.     if(my&7) extra_height -= 3;

  391. 

  392.     if(   full_mx < 0-extra_width

  393.           || full_my < 0-extra_height

  394.           || full_mx + 16/*FIXME*/ > pic_width + extra_width

  395.           || full_my + 16/*FIXME*/ > pic_height + extra_height){

  396.         ff_emulated_edge_mc(s->edge_emu_buffer, src_y - 2 - 2*h->l_stride, h->l_stride,

  397.                             16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);

  398.         src_y= s->edge_emu_buffer + 2 + 2*h->l_stride;

  399.         emu=1;

  400.     }

  401. 

  402.     qpix_op[luma_xy](dest_y, src_y, h->l_stride); //FIXME try variable height perhaps?

  403.     if(!square){

  404.         qpix_op[luma_xy](dest_y + delta, src_y + delta, h->l_stride);

  405.     }

  406. 

  407.     if(emu){

  408.         ff_emulated_edge_mc(s->edge_emu_buffer, src_cb, h->c_stride,

  409.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  410.         src_cb= s->edge_emu_buffer;

  411.     }

  412.     chroma_op(dest_cb, src_cb, h->c_stride, chroma_height, mx&7, my&7);

  413. 

  414.     if(emu){

  415.         ff_emulated_edge_mc(s->edge_emu_buffer, src_cr, h->c_stride,

  416.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  417.         src_cr= s->edge_emu_buffer;

  418.     }

  419.     chroma_op(dest_cr, src_cr, h->c_stride, chroma_height, mx&7, my&7);

  420. }

  421. 

  422. static inline void mc_part_std(AVSContext *h,int square,int chroma_height,int delta,

  423.                         uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,

  424.                         int x_offset, int y_offset,qpel_mc_func *qpix_put,

  425.                         h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,

  426.                         h264_chroma_mc_func chroma_avg, vector_t *mv){

  427.     qpel_mc_func *qpix_op=  qpix_put;

  428.     h264_chroma_mc_func chroma_op= chroma_put;

  429. 

  430.     dest_y  += 2*x_offset + 2*y_offset*h->l_stride;

  431.     dest_cb +=   x_offset +   y_offset*h->c_stride;

  432.     dest_cr +=   x_offset +   y_offset*h->c_stride;

  433.     x_offset += 8*h->mbx;

  434.     y_offset += 8*h->mby;

  435. 

  436.     if(mv->ref >= 0){

  437.         Picture *ref= &h->DPB[mv->ref];

  438.         mc_dir_part(h, ref, square, chroma_height, delta, 0,

  439.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  440.                     qpix_op, chroma_op, mv);

  441. 

  442.         qpix_op=  qpix_avg;

  443.         chroma_op= chroma_avg;

  444.     }

  445. 

  446.     if((mv+MV_BWD_OFFS)->ref >= 0){

  447.         Picture *ref= &h->DPB[0];

  448.         mc_dir_part(h, ref, square, chroma_height, delta, 1,

  449.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  450.                     qpix_op, chroma_op, mv+MV_BWD_OFFS);

  451.     }

  452. }

  453. 

  454. static void inter_pred(AVSContext *h, enum mb_t mb_type) {

  455.     if(partition_flags[mb_type] == 0){ // 16x16

  456.         mc_part_std(h, 1, 8, 0, h->cy, h->cu, h->cv, 0, 0,

  457.                 h->s.dsp.put_cavs_qpel_pixels_tab[0],

  458.                 h->s.dsp.put_h264_chroma_pixels_tab[0],

  459.                 h->s.dsp.avg_cavs_qpel_pixels_tab[0],

  460.                 h->s.dsp.avg_h264_chroma_pixels_tab[0],&h->mv[MV_FWD_X0]);

  461.     }else{

  462.         mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 0,

  463.                 h->s.dsp.put_cavs_qpel_pixels_tab[1],

  464.                 h->s.dsp.put_h264_chroma_pixels_tab[1],

  465.                 h->s.dsp.avg_cavs_qpel_pixels_tab[1],

  466.                 h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X0]);

  467.         mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 0,

  468.                 h->s.dsp.put_cavs_qpel_pixels_tab[1],

  469.                 h->s.dsp.put_h264_chroma_pixels_tab[1],

  470.                 h->s.dsp.avg_cavs_qpel_pixels_tab[1],

  471.                 h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X1]);

  472.         mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 4,

  473.                 h->s.dsp.put_cavs_qpel_pixels_tab[1],

  474.                 h->s.dsp.put_h264_chroma_pixels_tab[1],

  475.                 h->s.dsp.avg_cavs_qpel_pixels_tab[1],

  476.                 h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X2]);

  477.         mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 4,

  478.                 h->s.dsp.put_cavs_qpel_pixels_tab[1],

  479.                 h->s.dsp.put_h264_chroma_pixels_tab[1],

  480.                 h->s.dsp.avg_cavs_qpel_pixels_tab[1],

  481.                 h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X3]);

  482.     }

  483.     /* set intra prediction modes to default values */

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

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

  486. }

  487. 

  488. /*****************************************************************************

  489.  *

  490.  * motion vector prediction

  491.  *

  492.  ****************************************************************************/

  493. 

  494. static inline void set_mvs(vector_t *mv, enum block_t size) {

  495.     switch(size) {

  496.     case BLK_16X16:

  497.         mv[MV_STRIDE  ] = mv[0];

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

  499.     case BLK_16X8:

  500.         mv[1] = mv[0];

  501.         break;

  502.     case BLK_8X16:

  503.         mv[MV_STRIDE] = mv[0];

  504.         break;

  505.     }

  506. }

  507. 

  508. static inline void store_mvs(AVSContext *h) {

  509.     h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 0] = h->mv[MV_FWD_X0];

  510.     h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 1] = h->mv[MV_FWD_X1];

  511.     h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 2] = h->mv[MV_FWD_X2];

  512.     h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 3] = h->mv[MV_FWD_X3];

  513. }

  514. 

  515. static inline void scale_mv(AVSContext *h, int *d_x, int *d_y, vector_t *src, int distp) {

  516.     int den = h->scale_den[src->ref];

  517. 

  518.     *d_x = (src->x*distp*den + 256 + (src->x>>31)) >> 9;

  519.     *d_y = (src->y*distp*den + 256 + (src->y>>31)) >> 9;

  520. }

  521. 

  522. static inline void mv_pred_median(AVSContext *h, vector_t *mvP, vector_t *mvA, vector_t *mvB, vector_t *mvC) {

  523.     int ax, ay, bx, by, cx, cy;

  524.     int len_ab, len_bc, len_ca, len_mid;

  525. 

  526.     /* scale candidates according to their temporal span */

  527.     scale_mv(h, &ax, &ay, mvA, mvP->dist);

  528.     scale_mv(h, &bx, &by, mvB, mvP->dist);

  529.     scale_mv(h, &cx, &cy, mvC, mvP->dist);

  530.     /* find the geometrical median of the three candidates */

  531.     len_ab = abs(ax - bx) + abs(ay - by);

  532.     len_bc = abs(bx - cx) + abs(by - cy);

  533.     len_ca = abs(cx - ax) + abs(cy - ay);

  534.     len_mid = mid_pred(len_ab, len_bc, len_ca);

  535.     if(len_mid == len_ab) {

  536.         mvP->x = cx;

  537.         mvP->y = cy;

  538.     } else if(len_mid == len_bc) {

  539.         mvP->x = ax;

  540.         mvP->y = ay;

  541.     } else {

  542.         mvP->x = bx;

  543.         mvP->y = by;

  544.     }

  545. }

  546. 

  547. static inline void mv_pred_direct(AVSContext *h, vector_t *pmv_fw,

  548.                                   vector_t *col_mv) {

  549.     vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS;

  550.     int den = h->direct_den[col_mv->ref];

  551.     int m = col_mv->x >> 31;

  552. 

  553.     pmv_fw->dist = h->dist[1];

  554.     pmv_bw->dist = h->dist[0];

  555.     pmv_fw->ref = 1;

  556.     pmv_bw->ref = 0;

  557.     /* scale the co-located motion vector according to its temporal span */

  558.     pmv_fw->x = (((den+(den*col_mv->x*pmv_fw->dist^m)-m-1)>>14)^m)-m;

  559.     pmv_bw->x = m-(((den+(den*col_mv->x*pmv_bw->dist^m)-m-1)>>14)^m);

  560.     m = col_mv->y >> 31;

  561.     pmv_fw->y = (((den+(den*col_mv->y*pmv_fw->dist^m)-m-1)>>14)^m)-m;

  562.     pmv_bw->y = m-(((den+(den*col_mv->y*pmv_bw->dist^m)-m-1)>>14)^m);

  563. }

  564. 

  565. static inline void mv_pred_sym(AVSContext *h, vector_t *src, enum block_t size) {

  566.     vector_t *dst = src + MV_BWD_OFFS;

  567. 

  568.     /* backward mv is the scaled and negated forward mv */

  569.     dst->x = -((src->x * h->sym_factor + 256) >> 9);

  570.     dst->y = -((src->y * h->sym_factor + 256) >> 9);

  571.     dst->ref = 0;

  572.     dst->dist = h->dist[0];

  573.     set_mvs(dst, size);

  574. }

  575. 

  576. static void mv_pred(AVSContext *h, enum mv_loc_t nP, enum mv_loc_t nC,

  577.                     enum mv_pred_t mode, enum block_t size, int ref) {

  578.     vector_t *mvP = &h->mv[nP];

  579.     vector_t *mvA = &h->mv[nP-1];

  580.     vector_t *mvB = &h->mv[nP-4];

  581.     vector_t *mvC = &h->mv[nC];

  582.     const vector_t *mvP2 = NULL;

  583. 

  584.     mvP->ref = ref;

  585.     mvP->dist = h->dist[mvP->ref];

  586.     if(mvC->ref == NOT_AVAIL)

  587.         mvC = &h->mv[nP-5]; // set to top-left (mvD)

  588.     if((mode == MV_PRED_PSKIP) &&

  589.        ((mvA->ref == NOT_AVAIL) || (mvB->ref == NOT_AVAIL) ||

  590.            ((mvA->x | mvA->y | mvA->ref) == 0)  ||

  591.            ((mvB->x | mvB->y | mvB->ref) == 0) )) {

  592.         mvP2 = &un_mv;

  593.     /* if there is only one suitable candidate, take it */

  594.     } else if((mvA->ref >= 0) && (mvB->ref < 0) && (mvC->ref < 0)) {

  595.         mvP2= mvA;

  596.     } else if((mvA->ref < 0) && (mvB->ref >= 0) && (mvC->ref < 0)) {

  597.         mvP2= mvB;

  598.     } else if((mvA->ref < 0) && (mvB->ref < 0) && (mvC->ref >= 0)) {

  599.         mvP2= mvC;

  600.     } else if(mode == MV_PRED_LEFT     && mvA->ref == ref){

  601.         mvP2= mvA;

  602.     } else if(mode == MV_PRED_TOP      && mvB->ref == ref){

  603.         mvP2= mvB;

  604.     } else if(mode == MV_PRED_TOPRIGHT && mvC->ref == ref){

  605.         mvP2= mvC;

  606.     }

  607.     if(mvP2){

  608.         mvP->x = mvP2->x;

  609.         mvP->y = mvP2->y;

  610.     }else

  611.         mv_pred_median(h, mvP, mvA, mvB, mvC);

  612. 

  613.     if(mode < MV_PRED_PSKIP) {

  614.         mvP->x += get_se_golomb(&h->s.gb);

  615.         mvP->y += get_se_golomb(&h->s.gb);

  616.     }

  617.     set_mvs(mvP,size);

  618. }

  619. 

  620. /*****************************************************************************

  621.  *

  622.  * residual data decoding

  623.  *

  624.  ****************************************************************************/

  625. 

  626. /** kth-order exponential golomb code */

  627. static inline int get_ue_code(GetBitContext *gb, int order) {

  628.     if(order) {

  629.         int ret = get_ue_golomb(gb) << order;

  630.         return ret + get_bits(gb,order);

  631.     }

  632.     return get_ue_golomb(gb);

  633. }

  634. 

  635. /**

  636.  * decode coefficients from one 8x8 block, dequantize, inverse transform

  637.  *  and add them to sample block

  638.  * @param r pointer to 2D VLC table

  639.  * @param esc_golomb_order escape codes are k-golomb with this order k

  640.  * @param qp quantizer

  641.  * @param dst location of sample block

  642.  * @param stride line stride in frame buffer

  643.  */

  644. static int decode_residual_block(AVSContext *h, GetBitContext *gb,

  645.                                  const residual_vlc_t *r, int esc_golomb_order,

  646.                                  int qp, uint8_t *dst, int stride) {

  647.     int i,pos = -1;

  648.     int level_code, esc_code, level, run, mask;

  649.     int level_buf[64];

  650.     int run_buf[64];

  651.     int dqm = dequant_mul[qp];

  652.     int dqs = dequant_shift[qp];

  653.     int dqa = 1 << (dqs - 1);

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

  655.     DCTELEM *block = h->block;

  656. 

  657.     for(i=0;i<65;i++) {

  658.         level_code = get_ue_code(gb,r->golomb_order);

  659.         if(level_code >= ESCAPE_CODE) {

  660.             run = ((level_code - ESCAPE_CODE) >> 1) + 1;

  661.             esc_code = get_ue_code(gb,esc_golomb_order);

  662.             level = esc_code + (run > r->max_run ? 1 : r->level_add[run]);

  663.             while(level > r->inc_limit)

  664.                 r++;

  665.             mask = -(level_code & 1);

  666.             level = (level^mask) - mask;

  667.         } else {

  668.             level = r->rltab[level_code][0];

  669.             if(!level) //end of block signal

  670.                 break;

  671.             run   = r->rltab[level_code][1];

  672.             r += r->rltab[level_code][2];

  673.         }

  674.         level_buf[i] = level;

  675.         run_buf[i] = run;

  676.     }

  677.     /* inverse scan and dequantization */

  678.     while(--i >= 0){

  679.         pos += run_buf[i];

  680.         if(pos > 63) {

  681.             av_log(h->s.avctx, AV_LOG_ERROR,

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

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

  684.             return -1;

  685.         }

  686.         block[scantab[pos]] = (level_buf[i]*dqm + dqa) >> dqs;

  687.     }

  688.     h->s.dsp.cavs_idct8_add(dst,block,stride);

  689.     return 0;

  690. }

  691. 

  692. 

  693. static inline void decode_residual_chroma(AVSContext *h) {

  694.     if(h->cbp & (1<<4))

  695.         decode_residual_block(h,&h->s.gb,chroma_2dvlc,0, chroma_qp[h->qp],

  696.                               h->cu,h->c_stride);

  697.     if(h->cbp & (1<<5))

  698.         decode_residual_block(h,&h->s.gb,chroma_2dvlc,0, chroma_qp[h->qp],

  699.                               h->cv,h->c_stride);

  700. }

  701. 

  702. static inline int decode_residual_inter(AVSContext *h) {

  703.     int block;

  704. 

  705.     /* get coded block pattern */

  706.     int cbp= get_ue_golomb(&h->s.gb);

  707.     if(cbp > 63){

  708.         av_log(h->s.avctx, AV_LOG_ERROR, "illegal inter cbp\n");

  709.         return -1;

  710.     }

  711.     h->cbp = cbp_tab[cbp][1];

  712. 

  713.     /* get quantizer */

  714.     if(h->cbp && !h->qp_fixed)

  715.         h->qp = (h->qp + get_se_golomb(&h->s.gb)) & 63;

  716.     for(block=0;block<4;block++)

  717.         if(h->cbp & (1<<block))

  718.             decode_residual_block(h,&h->s.gb,inter_2dvlc,0,h->qp,

  719.                                   h->cy + h->luma_scan[block], h->l_stride);

  720.     decode_residual_chroma(h);

  721. 

  722.     return 0;

  723. }

  724. 

  725. /*****************************************************************************

  726.  *

  727.  * macroblock level

  728.  *

  729.  ****************************************************************************/

  730. 

  731. /**

  732.  * initialise predictors for motion vectors and intra prediction

  733.  */

  734. static inline void init_mb(AVSContext *h) {

  735.     int i;

  736. 

  737.     /* copy predictors from top line (MB B and C) into cache */

  738.     for(i=0;i<3;i++) {

  739.         h->mv[MV_FWD_B2+i] = h->top_mv[0][h->mbx*2+i];

  740.         h->mv[MV_BWD_B2+i] = h->top_mv[1][h->mbx*2+i];

  741.     }

  742.     h->pred_mode_Y[1] = h->top_pred_Y[h->mbx*2+0];

  743.     h->pred_mode_Y[2] = h->top_pred_Y[h->mbx*2+1];

  744.     /* clear top predictors if MB B is not available */

  745.     if(!(h->flags & B_AVAIL)) {

  746.         h->mv[MV_FWD_B2] = un_mv;

  747.         h->mv[MV_FWD_B3] = un_mv;

  748.         h->mv[MV_BWD_B2] = un_mv;

  749.         h->mv[MV_BWD_B3] = un_mv;

  750.         h->pred_mode_Y[1] = h->pred_mode_Y[2] = NOT_AVAIL;

  751.         h->flags &= ~(C_AVAIL|D_AVAIL);

  752.     } else if(h->mbx) {

  753.         h->flags |= D_AVAIL;

  754.     }

  755.     if(h->mbx == h->mb_width-1) //MB C not available

  756.         h->flags &= ~C_AVAIL;

  757.     /* clear top-right predictors if MB C is not available */

  758.     if(!(h->flags & C_AVAIL)) {

  759.         h->mv[MV_FWD_C2] = un_mv;

  760.         h->mv[MV_BWD_C2] = un_mv;

  761.     }

  762.     /* clear top-left predictors if MB D is not available */

  763.     if(!(h->flags & D_AVAIL)) {

  764.         h->mv[MV_FWD_D3] = un_mv;

  765.         h->mv[MV_BWD_D3] = un_mv;

  766.     }

  767.     /* set pointer for co-located macroblock type */

  768.     h->col_type = &h->col_type_base[h->mby*h->mb_width + h->mbx];

  769. }

  770. 

  771. static inline void check_for_slice(AVSContext *h);

  772. 

  773. /**

  774.  * save predictors for later macroblocks and increase

  775.  * macroblock address

  776.  * @returns 0 if end of frame is reached, 1 otherwise

  777.  */

  778. static inline int next_mb(AVSContext *h) {

  779.     int i;

  780. 

  781.     h->flags |= A_AVAIL;

  782.     h->cy += 16;

  783.     h->cu += 8;

  784.     h->cv += 8;

  785.     /* copy mvs as predictors to the left */

  786.     for(i=0;i<=20;i+=4)

  787.         h->mv[i] = h->mv[i+2];

  788.     /* copy bottom mvs from cache to top line */

  789.     h->top_mv[0][h->mbx*2+0] = h->mv[MV_FWD_X2];

  790.     h->top_mv[0][h->mbx*2+1] = h->mv[MV_FWD_X3];

  791.     h->top_mv[1][h->mbx*2+0] = h->mv[MV_BWD_X2];

  792.     h->top_mv[1][h->mbx*2+1] = h->mv[MV_BWD_X3];

  793.     /* next MB address */

  794.     h->mbx++;

  795.     if(h->mbx == h->mb_width) { //new mb line

  796.         h->flags = B_AVAIL|C_AVAIL;

  797.         /* clear left pred_modes */

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

  799.         /* clear left mv predictors */

  800.         for(i=0;i<=20;i+=4)

  801.             h->mv[i] = un_mv;

  802.         h->mbx = 0;

  803.         h->mby++;

  804.         /* re-calculate sample pointers */

  805.         h->cy = h->picture.data[0] + h->mby*16*h->l_stride;

  806.         h->cu = h->picture.data[1] + h->mby*8*h->c_stride;

  807.         h->cv = h->picture.data[2] + h->mby*8*h->c_stride;

  808.         if(h->mby == h->mb_height) { //frame end

  809.             return 0;

  810.         } else {

  811.             //check_for_slice(h);

  812.         }

  813.     }

  814.     return 1;

  815. }

  816. 

  817. static int decode_mb_i(AVSContext *h, int cbp_code) {

  818.     GetBitContext *gb = &h->s.gb;

  819.     int block, pred_mode_uv;

  820.     uint8_t top[18];

  821.     uint8_t *left = NULL;

  822.     uint8_t *d;

  823. 

  824.     init_mb(h);

  825. 

  826.     /* get intra prediction modes from stream */

  827.     for(block=0;block<4;block++) {

  828.         int nA,nB,predpred;

  829.         int pos = scan3x3[block];

  830. 

  831.         nA = h->pred_mode_Y[pos-1];

  832.         nB = h->pred_mode_Y[pos-3];

  833.         predpred = FFMIN(nA,nB);

  834.         if(predpred == NOT_AVAIL) // if either is not available

  835.             predpred = INTRA_L_LP;

  836.         if(!get_bits1(gb)){

  837.             int rem_mode= get_bits(gb, 2);

  838.             predpred = rem_mode + (rem_mode >= predpred);

  839.         }

  840.         h->pred_mode_Y[pos] = predpred;

  841.     }

  842.     pred_mode_uv = get_ue_golomb(gb);

  843.     if(pred_mode_uv > 6) {

  844.         av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");

  845.         return -1;

  846.     }

  847. 

  848.     /* save pred modes before they get modified */

  849.     h->pred_mode_Y[3] =  h->pred_mode_Y[5];

  850.     h->pred_mode_Y[6] =  h->pred_mode_Y[8];

  851.     h->top_pred_Y[h->mbx*2+0] = h->pred_mode_Y[7];

  852.     h->top_pred_Y[h->mbx*2+1] = h->pred_mode_Y[8];

  853. 

  854.     /* modify pred modes according to availability of neighbour samples */

  855.     if(!(h->flags & A_AVAIL)) {

  856.         modify_pred(left_modifier_l, &h->pred_mode_Y[4] );

  857.         modify_pred(left_modifier_l, &h->pred_mode_Y[7] );

  858.         modify_pred(left_modifier_c, &pred_mode_uv );

  859.     }

  860.     if(!(h->flags & B_AVAIL)) {

  861.         modify_pred(top_modifier_l, &h->pred_mode_Y[4] );

  862.         modify_pred(top_modifier_l, &h->pred_mode_Y[5] );

  863.         modify_pred(top_modifier_c, &pred_mode_uv );

  864.     }

  865. 

  866.     /* get coded block pattern */

  867.     if(h->pic_type == FF_I_TYPE)

  868.         cbp_code = get_ue_golomb(gb);

  869.     if(cbp_code > 63){

  870.         av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra cbp\n");

  871.         return -1;

  872.     }

  873.     h->cbp = cbp_tab[cbp_code][0];

  874.     if(h->cbp && !h->qp_fixed)

  875.         h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta

  876. 

  877.     /* luma intra prediction interleaved with residual decode/transform/add */

  878.     for(block=0;block<4;block++) {

  879.         d = h->cy + h->luma_scan[block];

  880.         load_intra_pred_luma(h, top, &left, block);

  881.         h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]]

  882.             (d, top, left, h->l_stride);

  883.         if(h->cbp & (1<<block))

  884.             decode_residual_block(h,gb,intra_2dvlc,1,h->qp,d,h->l_stride);

  885.     }

  886. 

  887.     /* chroma intra prediction */

  888.     /* extend borders by one pixel */

  889.     h->left_border_u[9] = h->left_border_u[8];

  890.     h->left_border_v[9] = h->left_border_v[8];

  891.     h->top_border_u[h->mbx*10+9] = h->top_border_u[h->mbx*10+8];

  892.     h->top_border_v[h->mbx*10+9] = h->top_border_v[h->mbx*10+8];

  893.     if(h->mbx && h->mby) {

  894.         h->top_border_u[h->mbx*10] = h->left_border_u[0] = h->topleft_border_u;

  895.         h->top_border_v[h->mbx*10] = h->left_border_v[0] = h->topleft_border_v;

  896.     } else {

  897.         h->left_border_u[0] = h->left_border_u[1];

  898.         h->left_border_v[0] = h->left_border_v[1];

  899.         h->top_border_u[h->mbx*10] = h->top_border_u[h->mbx*10+1];

  900.         h->top_border_v[h->mbx*10] = h->top_border_v[h->mbx*10+1];

  901.     }

  902.     h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx*10],

  903.                                   h->left_border_u, h->c_stride);

  904.     h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx*10],

  905.                                   h->left_border_v, h->c_stride);

  906. 

  907.     decode_residual_chroma(h);

  908.     filter_mb(h,I_8X8);

  909. 

  910.     /* mark motion vectors as intra */

  911.     h->mv[MV_FWD_X0] = intra_mv;

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

  913.     h->mv[MV_BWD_X0] = intra_mv;

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

  915.     if(h->pic_type != FF_B_TYPE)

  916.         *h->col_type = I_8X8;

  917. 

  918.     return 0;

  919. }

  920. 

  921. static void decode_mb_p(AVSContext *h, enum mb_t mb_type) {

  922.     GetBitContext *gb = &h->s.gb;

  923.     int ref[4];

  924. 

  925.     init_mb(h);

  926.     switch(mb_type) {

  927.     case P_SKIP:

  928.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0);

  929.         break;

  930.     case P_16X16:

  931.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  932.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN,   BLK_16X16,ref[0]);

  933.         break;

  934.     case P_16X8:

  935.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  936.         ref[2] = h->ref_flag ? 0 : get_bits1(gb);

  937.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,      BLK_16X8, ref[0]);

  938.         mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT,     BLK_16X8, ref[2]);

  939.         break;

  940.     case P_8X16:

  941.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  942.         ref[1] = h->ref_flag ? 0 : get_bits1(gb);

  943.         mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT,     BLK_8X16, ref[0]);

  944.         mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]);

  945.         break;

  946.     case P_8X8:

  947.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  948.         ref[1] = h->ref_flag ? 0 : get_bits1(gb);

  949.         ref[2] = h->ref_flag ? 0 : get_bits1(gb);

  950.         ref[3] = h->ref_flag ? 0 : get_bits1(gb);

  951.         mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN,   BLK_8X8, ref[0]);

  952.         mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN,   BLK_8X8, ref[1]);

  953.         mv_pred(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN,   BLK_8X8, ref[2]);

  954.         mv_pred(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN,   BLK_8X8, ref[3]);

  955.     }

  956.     inter_pred(h, mb_type);

  957.     store_mvs(h);

  958.     if(mb_type != P_SKIP)

  959.         decode_residual_inter(h);

  960.     filter_mb(h,mb_type);

  961.     *h->col_type = mb_type;

  962. }

  963. 

  964. static void decode_mb_b(AVSContext *h, enum mb_t mb_type) {

  965.     int block;

  966.     enum sub_mb_t sub_type[4];

  967.     int flags;

  968. 

  969.     init_mb(h);

  970. 

  971.     /* reset all MVs */

  972.     h->mv[MV_FWD_X0] = dir_mv;

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

  974.     h->mv[MV_BWD_X0] = dir_mv;

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

  976.     switch(mb_type) {

  977.     case B_SKIP:

  978.     case B_DIRECT:

  979.         if(!(*h->col_type)) {

  980.             /* intra MB at co-location, do in-plane prediction */

  981.             mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);

  982.             mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);

  983.         } else

  984.             /* direct prediction from co-located P MB, block-wise */

  985.             for(block=0;block<4;block++)

  986.                 mv_pred_direct(h,&h->mv[mv_scan[block]],

  987.                             &h->col_mv[(h->mby*h->mb_width+h->mbx)*4 + block]);

  988.         break;

  989.     case B_FWD_16X16:

  990.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);

  991.         break;

  992.     case B_SYM_16X16:

  993.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);

  994.         mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);

  995.         break;

  996.     case B_BWD_16X16:

  997.         mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);

  998.         break;

  999.     case B_8X8:

  1000.         for(block=0;block<4;block++)

  1001.             sub_type[block] = get_bits(&h->s.gb,2);

  1002.         for(block=0;block<4;block++) {

  1003.             switch(sub_type[block]) {

  1004.             case B_SUB_DIRECT:

  1005.                 if(!(*h->col_type)) {

  1006.                     /* intra MB at co-location, do in-plane prediction */

  1007.                     mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1008.                             MV_PRED_BSKIP, BLK_8X8, 1);

  1009.                     mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1010.                             mv_scan[block]-3+MV_BWD_OFFS,

  1011.                             MV_PRED_BSKIP, BLK_8X8, 0);

  1012.                 } else

  1013.                     mv_pred_direct(h,&h->mv[mv_scan[block]],

  1014.                                    &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);

  1015.                 break;

  1016.             case B_SUB_FWD:

  1017.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1018.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1019.                 break;

  1020.             case B_SUB_SYM:

  1021.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1022.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1023.                 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);

  1024.                 break;

  1025.             }

  1026.         }

  1027.         for(block=0;block<4;block++) {

  1028.             if(sub_type[block] == B_SUB_BWD)

  1029.                 mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1030.                         mv_scan[block]+MV_BWD_OFFS-3,

  1031.                         MV_PRED_MEDIAN, BLK_8X8, 0);

  1032.         }

  1033.         break;

  1034.     default:

  1035.         assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));

  1036.         flags = partition_flags[mb_type];

  1037.         if(mb_type & 1) { /* 16x8 macroblock types */

  1038.             if(flags & FWD0)

  1039.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1040.             if(flags & SYM0)

  1041.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);

  1042.             if(flags & FWD1)

  1043.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1044.             if(flags & SYM1)

  1045.                 mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);

  1046.             if(flags & BWD0)

  1047.                 mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP,  BLK_16X8, 0);

  1048.             if(flags & BWD1)

  1049.                 mv_pred(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);

  1050.         } else {          /* 8x16 macroblock types */

  1051.             if(flags & FWD0)

  1052.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1053.             if(flags & SYM0)

  1054.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);

  1055.             if(flags & FWD1)

  1056.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1057.             if(flags & SYM1)

  1058.                 mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);

  1059.             if(flags & BWD0)

  1060.                 mv_pred(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);

  1061.             if(flags & BWD1)

  1062.                 mv_pred(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 0);

  1063.         }

  1064.     }

  1065.     inter_pred(h, mb_type);

  1066.     if(mb_type != B_SKIP)

  1067.         decode_residual_inter(h);

  1068.     filter_mb(h,mb_type);

  1069. }

  1070. 

  1071. /*****************************************************************************

  1072.  *

  1073.  * slice level

  1074.  *

  1075.  ****************************************************************************/

  1076. 

  1077. static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {

  1078.     if(h->stc > 0xAF)

  1079.         av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);

  1080.     h->mby = h->stc;

  1081.     if((h->mby == 0) && (!h->qp_fixed)){

  1082.         h->qp_fixed = get_bits1(gb);

  1083.         h->qp = get_bits(gb,6);

  1084.     }

  1085.     /* inter frame or second slice can have weighting params */

  1086.     if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2))

  1087.         if(get_bits1(gb)) { //slice_weighting_flag

  1088.             av_log(h->s.avctx, AV_LOG_ERROR,

  1089.                    "weighted prediction not yet supported\n");

  1090.         }

  1091.     return 0;

  1092. }

  1093. 

  1094. static inline void check_for_slice(AVSContext *h) {

  1095.     GetBitContext *gb = &h->s.gb;

  1096.     int align;

  1097.     align = (-get_bits_count(gb)) & 7;

  1098.     if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {

  1099.         get_bits_long(gb,24+align);

  1100.         h->stc = get_bits(gb,8);

  1101.         decode_slice_header(h,gb);

  1102.     }

  1103. }

  1104. 

  1105. /*****************************************************************************

  1106.  *

  1107.  * frame level

  1108.  *

  1109.  ****************************************************************************/

  1110. 

  1111. static void init_pic(AVSContext *h) {

  1112.     int i;

  1113. 

  1114.     /* clear some predictors */

  1115.     for(i=0;i<=20;i+=4)

  1116.         h->mv[i] = un_mv;

  1117.     h->mv[MV_BWD_X0] = dir_mv;

  1118.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1119.     h->mv[MV_FWD_X0] = dir_mv;

  1120.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1121.     h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;

  1122.     h->cy = h->picture.data[0];

  1123.     h->cu = h->picture.data[1];

  1124.     h->cv = h->picture.data[2];

  1125.     h->l_stride = h->picture.linesize[0];

  1126.     h->c_stride = h->picture.linesize[1];

  1127.     h->luma_scan[2] = 8*h->l_stride;

  1128.     h->luma_scan[3] = 8*h->l_stride+8;

  1129.     h->mbx = h->mby = 0;

  1130.     h->flags = 0;

  1131. }

  1132. 

  1133. static int decode_pic(AVSContext *h) {

  1134.     MpegEncContext *s = &h->s;

  1135.     int skip_count;

  1136.     enum mb_t mb_type;

  1137. 

  1138.     if (!s->context_initialized) {

  1139.         s->avctx->idct_algo = FF_IDCT_CAVS;

  1140.         if (MPV_common_init(s) < 0)

  1141.             return -1;

  1142.         ff_init_scantable(s->dsp.idct_permutation,&h->scantable,ff_zigzag_direct);

  1143.     }

  1144.     get_bits(&s->gb,16);//bbv_dwlay

  1145.     if(h->stc == PIC_PB_START_CODE) {

  1146.         h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE;

  1147.         if(h->pic_type > FF_B_TYPE) {

  1148.             av_log(s->avctx, AV_LOG_ERROR, "illegal picture type\n");

  1149.             return -1;

  1150.         }

  1151.         /* make sure we have the reference frames we need */

  1152.         if(!h->DPB[0].data[0] ||

  1153.           (!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE))

  1154.             return -1;

  1155.     } else {

  1156.         h->pic_type = FF_I_TYPE;

  1157.         if(get_bits1(&s->gb))

  1158.             get_bits(&s->gb,16);//time_code

  1159.     }

  1160.     /* release last B frame */

  1161.     if(h->picture.data[0])

  1162.         s->avctx->release_buffer(s->avctx, (AVFrame *)&h->picture);

  1163. 

  1164.     s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture);

  1165.     init_pic(h);

  1166.     h->picture.poc = get_bits(&s->gb,8)*2;

  1167. 

  1168.     /* get temporal distances and MV scaling factors */

  1169.     if(h->pic_type != FF_B_TYPE) {

  1170.         h->dist[0] = (h->picture.poc - h->DPB[0].poc  + 512) % 512;

  1171.     } else {

  1172.         h->dist[0] = (h->DPB[0].poc  - h->picture.poc + 512) % 512;

  1173.     }

  1174.     h->dist[1] = (h->picture.poc - h->DPB[1].poc  + 512) % 512;

  1175.     h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;

  1176.     h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;

  1177.     if(h->pic_type == FF_B_TYPE) {

  1178.         h->sym_factor = h->dist[0]*h->scale_den[1];

  1179.     } else {

  1180.         h->direct_den[0] = h->dist[0] ? 16384/h->dist[0] : 0;

  1181.         h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0;

  1182.     }

  1183. 

  1184.     if(s->low_delay)

  1185.         get_ue_golomb(&s->gb); //bbv_check_times

  1186.     h->progressive             = get_bits1(&s->gb);

  1187.     if(h->progressive)

  1188.         h->pic_structure = 1;

  1189.     else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) )

  1190.         get_bits1(&s->gb);     //advanced_pred_mode_disable

  1191.     skip_bits1(&s->gb);        //top_field_first

  1192.     skip_bits1(&s->gb);        //repeat_first_field

  1193.     h->qp_fixed                = get_bits1(&s->gb);

  1194.     h->qp                      = get_bits(&s->gb,6);

  1195.     if(h->pic_type == FF_I_TYPE) {

  1196.         if(!h->progressive && !h->pic_structure)

  1197.             skip_bits1(&s->gb);//what is this?

  1198.         skip_bits(&s->gb,4);   //reserved bits

  1199.     } else {

  1200.         if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1))

  1201.             h->ref_flag        = get_bits1(&s->gb);

  1202.         skip_bits(&s->gb,4);   //reserved bits

  1203.         h->skip_mode_flag      = get_bits1(&s->gb);

  1204.     }

  1205.     h->loop_filter_disable     = get_bits1(&s->gb);

  1206.     if(!h->loop_filter_disable && get_bits1(&s->gb)) {

  1207.         h->alpha_offset        = get_se_golomb(&s->gb);

  1208.         h->beta_offset         = get_se_golomb(&s->gb);

  1209.     } else {

  1210.         h->alpha_offset = h->beta_offset  = 0;

  1211.     }

  1212.     check_for_slice(h);

  1213.     if(h->pic_type == FF_I_TYPE) {

  1214.         do {

  1215.             decode_mb_i(h, 0);

  1216.         } while(next_mb(h));

  1217.     } else if(h->pic_type == FF_P_TYPE) {

  1218.         do {

  1219.             if(h->skip_mode_flag) {

  1220.                 skip_count = get_ue_golomb(&s->gb);

  1221.                 while(skip_count--) {

  1222.                     decode_mb_p(h,P_SKIP);

  1223.                     if(!next_mb(h))

  1224.                         goto done;

  1225.                 }

  1226.                 mb_type = get_ue_golomb(&s->gb) + P_16X16;

  1227.             } else

  1228.                 mb_type = get_ue_golomb(&s->gb) + P_SKIP;

  1229.             if(mb_type > P_8X8) {

  1230.                 decode_mb_i(h, mb_type - P_8X8 - 1);

  1231.             } else

  1232.                 decode_mb_p(h,mb_type);

  1233.         } while(next_mb(h));

  1234.     } else { /* FF_B_TYPE */

  1235.         do {

  1236.             if(h->skip_mode_flag) {

  1237.                 skip_count = get_ue_golomb(&s->gb);

  1238.                 while(skip_count--) {

  1239.                     decode_mb_b(h,B_SKIP);

  1240.                     if(!next_mb(h))

  1241.                         goto done;

  1242.                 }

  1243.                 mb_type = get_ue_golomb(&s->gb) + B_DIRECT;

  1244.             } else

  1245.                 mb_type = get_ue_golomb(&s->gb) + B_SKIP;

  1246.             if(mb_type > B_8X8) {

  1247.                 decode_mb_i(h, mb_type - B_8X8 - 1);

  1248.             } else

  1249.                 decode_mb_b(h,mb_type);

  1250.         } while(next_mb(h));

  1251.     }

  1252.  done:

  1253.     if(h->pic_type != FF_B_TYPE) {

  1254.         if(h->DPB[1].data[0])

  1255.             s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]);

  1256.         memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture));

  1257.         memcpy(&h->DPB[0], &h->picture, sizeof(Picture));

  1258.         memset(&h->picture,0,sizeof(Picture));

  1259.     }

  1260.     return 0;

  1261. }

  1262. 

  1263. /*****************************************************************************

  1264.  *

  1265.  * headers and interface

  1266.  *

  1267.  ****************************************************************************/

  1268. 

  1269. /**

  1270.  * some predictions require data from the top-neighbouring macroblock.

  1271.  * this data has to be stored for one complete row of macroblocks

  1272.  * and this storage space is allocated here

  1273.  */

  1274. static void init_top_lines(AVSContext *h) {

  1275.     /* alloc top line of predictors */

  1276.     h->top_qp       = av_malloc( h->mb_width);

  1277.     h->top_mv[0]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1278.     h->top_mv[1]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1279.     h->top_pred_Y   = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));

  1280.     h->top_border_y = av_malloc((h->mb_width+1)*16);

  1281.     h->top_border_u = av_malloc((h->mb_width)*10);

  1282.     h->top_border_v = av_malloc((h->mb_width)*10);

  1283. 

  1284.     /* alloc space for co-located MVs and types */

  1285.     h->col_mv       = av_malloc( h->mb_width*h->mb_height*4*sizeof(vector_t));

  1286.     h->col_type_base = av_malloc(h->mb_width*h->mb_height);

  1287.     h->block        = av_mallocz(64*sizeof(DCTELEM));

  1288. }

  1289. 

  1290. static int decode_seq_header(AVSContext *h) {

  1291.     MpegEncContext *s = &h->s;

  1292.     extern const AVRational ff_frame_rate_tab[];

  1293.     int frame_rate_code;

  1294. 

  1295.     h->profile =         get_bits(&s->gb,8);

  1296.     h->level =           get_bits(&s->gb,8);

  1297.     skip_bits1(&s->gb); //progressive sequence

  1298.     s->width =           get_bits(&s->gb,14);

  1299.     s->height =          get_bits(&s->gb,14);

  1300.     skip_bits(&s->gb,2); //chroma format

  1301.     skip_bits(&s->gb,3); //sample_precision

  1302.     h->aspect_ratio =    get_bits(&s->gb,4);

  1303.     frame_rate_code =    get_bits(&s->gb,4);

  1304.     skip_bits(&s->gb,18);//bit_rate_lower

  1305.     skip_bits1(&s->gb);  //marker_bit

  1306.     skip_bits(&s->gb,12);//bit_rate_upper

  1307.     s->low_delay =       get_bits1(&s->gb);

  1308.     h->mb_width  = (s->width  + 15) >> 4;

  1309.     h->mb_height = (s->height + 15) >> 4;

  1310.     h->s.avctx->time_base.den = ff_frame_rate_tab[frame_rate_code].num;

  1311.     h->s.avctx->time_base.num = ff_frame_rate_tab[frame_rate_code].den;

  1312.     h->s.avctx->width  = s->width;

  1313.     h->s.avctx->height = s->height;

  1314.     if(!h->top_qp)

  1315.         init_top_lines(h);

  1316.     return 0;

  1317. }

  1318. 

  1319. /**

  1320.  * finds the end of the current frame in the bitstream.

  1321.  * @return the position of the first byte of the next frame, or -1

  1322.  */

  1323. int ff_cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) {

  1324.     int pic_found, i;

  1325.     uint32_t state;

  1326. 

  1327.     pic_found= pc->frame_start_found;

  1328.     state= pc->state;

  1329. 

  1330.     i=0;

  1331.     if(!pic_found){

  1332.         for(i=0; i<buf_size; i++){

  1333.             state= (state<<8) | buf[i];

  1334.             if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){

  1335.                 i++;

  1336.                 pic_found=1;

  1337.                 break;

  1338.             }

  1339.         }

  1340.     }

  1341. 

  1342.     if(pic_found){

  1343.         /* EOF considered as end of frame */

  1344.         if (buf_size == 0)

  1345.             return 0;

  1346.         for(; i<buf_size; i++){

  1347.             state= (state<<8) | buf[i];

  1348.             if((state&0xFFFFFF00) == 0x100){

  1349.                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){

  1350.                     pc->frame_start_found=0;

  1351.                     pc->state=-1;

  1352.                     return i-3;

  1353.                 }

  1354.             }

  1355.         }

  1356.     }

  1357.     pc->frame_start_found= pic_found;

  1358.     pc->state= state;

  1359.     return END_NOT_FOUND;

  1360. }

  1361. 

  1362. void ff_cavs_flush(AVCodecContext * avctx) {

  1363.     AVSContext *h = avctx->priv_data;

  1364.     h->got_keyframe = 0;

  1365. }

  1366. 

  1367. static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size,

  1368.                              uint8_t * buf, int buf_size) {

  1369.     AVSContext *h = avctx->priv_data;

  1370.     MpegEncContext *s = &h->s;

  1371.     int input_size;

  1372.     const uint8_t *buf_end;

  1373.     const uint8_t *buf_ptr;

  1374.     AVFrame *picture = data;

  1375.     uint32_t stc;

  1376. 

  1377.     s->avctx = avctx;

  1378. 

  1379.     if (buf_size == 0) {

  1380.         if(!s->low_delay && h->DPB[0].data[0]) {

  1381.             *data_size = sizeof(AVPicture);

  1382.             *picture = *(AVFrame *) &h->DPB[0];

  1383.         }

  1384.         return 0;

  1385.     }

  1386. 

  1387.     buf_ptr = buf;

  1388.     buf_end = buf + buf_size;

  1389.     for(;;) {

  1390.         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &stc);

  1391.         if(stc & 0xFFFFFE00)

  1392.             return FFMAX(0, buf_ptr - buf - s->parse_context.last_index);

  1393.         input_size = (buf_end - buf_ptr)*8;

  1394.         switch(stc) {

  1395.         case SEQ_START_CODE:

  1396.             init_get_bits(&s->gb, buf_ptr, input_size);

  1397.             decode_seq_header(h);

  1398.             break;

  1399.         case PIC_I_START_CODE:

  1400.             if(!h->got_keyframe) {

  1401.                 if(h->DPB[0].data[0])

  1402.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[0]);

  1403.                 if(h->DPB[1].data[0])

  1404.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[1]);

  1405.                 h->got_keyframe = 1;

  1406.             }

  1407.         case PIC_PB_START_CODE:

  1408.             *data_size = 0;

  1409.             if(!h->got_keyframe)

  1410.                 break;

  1411.             init_get_bits(&s->gb, buf_ptr, input_size);

  1412.             h->stc = stc;

  1413.             if(decode_pic(h))

  1414.                 break;

  1415.             *data_size = sizeof(AVPicture);

  1416.             if(h->pic_type != FF_B_TYPE) {

  1417.                 if(h->DPB[1].data[0]) {

  1418.                     *picture = *(AVFrame *) &h->DPB[1];

  1419.                 } else {

  1420.                     *data_size = 0;

  1421.                 }

  1422.             } else

  1423.                 *picture = *(AVFrame *) &h->picture;

  1424.             break;

  1425.         case EXT_START_CODE:

  1426.             //mpeg_decode_extension(avctx,buf_ptr, input_size);

  1427.             break;

  1428.         case USER_START_CODE:

  1429.             //mpeg_decode_user_data(avctx,buf_ptr, input_size);

  1430.             break;

  1431.         default:

  1432.             if (stc >= SLICE_MIN_START_CODE &&

  1433.                 stc <= SLICE_MAX_START_CODE) {

  1434.                 init_get_bits(&s->gb, buf_ptr, input_size);

  1435.                 decode_slice_header(h, &s->gb);

  1436.             }

  1437.             break;

  1438.         }

  1439.     }

  1440. }

  1441. 

  1442. static int cavs_decode_init(AVCodecContext * avctx) {

  1443.     AVSContext *h = avctx->priv_data;

  1444.     MpegEncContext * const s = &h->s;

  1445. 

  1446.     MPV_decode_defaults(s);

  1447.     s->avctx = avctx;

  1448. 

  1449.     avctx->pix_fmt= PIX_FMT_YUV420P;

  1450. 

  1451.     h->luma_scan[0] = 0;

  1452.     h->luma_scan[1] = 8;

  1453.     h->intra_pred_l[      INTRA_L_VERT] = intra_pred_vert;

  1454.     h->intra_pred_l[     INTRA_L_HORIZ] = intra_pred_horiz;

  1455.     h->intra_pred_l[        INTRA_L_LP] = intra_pred_lp;

  1456.     h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;

  1457.     h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;

  1458.     h->intra_pred_l[   INTRA_L_LP_LEFT] = intra_pred_lp_left;

  1459.     h->intra_pred_l[    INTRA_L_LP_TOP] = intra_pred_lp_top;

  1460.     h->intra_pred_l[    INTRA_L_DC_128] = intra_pred_dc_128;

  1461.     h->intra_pred_c[        INTRA_C_LP] = intra_pred_lp;

  1462.     h->intra_pred_c[     INTRA_C_HORIZ] = intra_pred_horiz;

  1463.     h->intra_pred_c[      INTRA_C_VERT] = intra_pred_vert;

  1464.     h->intra_pred_c[     INTRA_C_PLANE] = intra_pred_plane;

  1465.     h->intra_pred_c[   INTRA_C_LP_LEFT] = intra_pred_lp_left;

  1466.     h->intra_pred_c[    INTRA_C_LP_TOP] = intra_pred_lp_top;

  1467.     h->intra_pred_c[    INTRA_C_DC_128] = intra_pred_dc_128;

  1468.     h->mv[ 7] = un_mv;

  1469.     h->mv[19] = un_mv;

  1470.     return 0;

  1471. }

  1472. 

  1473. static int cavs_decode_end(AVCodecContext * avctx) {

  1474.     AVSContext *h = avctx->priv_data;

  1475. 

  1476.     av_free(h->top_qp);

  1477.     av_free(h->top_mv[0]);

  1478.     av_free(h->top_mv[1]);

  1479.     av_free(h->top_pred_Y);

  1480.     av_free(h->top_border_y);

  1481.     av_free(h->top_border_u);

  1482.     av_free(h->top_border_v);

  1483.     av_free(h->col_mv);

  1484.     av_free(h->col_type_base);

  1485.     av_free(h->block);

  1486.     return 0;

  1487. }

  1488. 

  1489. AVCodec cavs_decoder = {

  1490.     "cavs",

  1491.     CODEC_TYPE_VIDEO,

  1492.     CODEC_ID_CAVS,

  1493.     sizeof(AVSContext),

  1494.     cavs_decode_init,

  1495.     NULL,

  1496.     cavs_decode_end,

  1497.     cavs_decode_frame,

  1498.     CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1499.     .flush= ff_cavs_flush,

  1500. };