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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. 

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

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

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

  85.     uint8_t left_border_y[16], left_border_u[10], left_border_v[10];

  86.     uint8_t topleft_border_y, topleft_border_u, topleft_border_v;

  87. 

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

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

  90.     uint8_t *col_type_base;

  91.     uint8_t *col_type;

  92. 

  93.     /* scaling factors for MV prediction */

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

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

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

  97. 

  98.     int got_keyframe;

  99. } AVSContext;

  100. 

  101. /*****************************************************************************

  102.  *

  103.  * in-loop deblocking filter

  104.  *

  105.  ****************************************************************************/

  106. 

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

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

  109.         return 2;

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

  111.         return 1;

  112.     if(b){

  113.         mvP += MV_BWD_OFFS;

  114.         mvQ += MV_BWD_OFFS;

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

  116.             return 1;

  117.     }else{

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

  119.             return 1;

  120.     }

  121.     return 0;

  122. }

  123. 

  124. #define SET_PARAMS                                            \

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

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

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

  128. 

  129. /**

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

  131.  *

  132.  * boundary strength (bs) mapping:

  133.  *

  134.  * --4---5--

  135.  * 0   2   |

  136.  * | 6 | 7 |

  137.  * 1   3   |

  138.  * ---------

  139.  *

  140.  */

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

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

  143.     int qp_avg, alpha, beta, tc;

  144.     int i;

  145. 

  146.     /* save un-deblocked lines */

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

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

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

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

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

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

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

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

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

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

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

  158.     }

  159.     if(!h->loop_filter_disable) {

  160.         /* determine bs */

  161.         if(mb_type == I_8X8)

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

  163.         else{

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

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

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

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

  168.             }

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

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

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

  172.             }

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

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

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

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

  177.         }

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

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

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

  181.                 SET_PARAMS;

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

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

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

  185.             }

  186.             qp_avg = h->qp;

  187.             SET_PARAMS;

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

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

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

  191. 

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

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

  194.                 SET_PARAMS;

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

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

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

  198.             }

  199.         }

  200.     }

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

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

  203. }

  204. 

  205. #undef SET_PARAMS

  206. 

  207. /*****************************************************************************

  208.  *

  209.  * spatial intra prediction

  210.  *

  211.  ****************************************************************************/

  212. 

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

  214.                                         uint8_t *left, int block) {

  215.     int i;

  216. 

  217.     switch(block) {

  218.     case 0:

  219.         memcpy(&left[1],h->left_border_y,16);

  220.         left[0] = left[1];

  221.         left[17] = left[16];

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

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

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

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

  226.             left[0] = top[0] = h->topleft_border_y;

  227.         break;

  228.     case 1:

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

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

  231.         memset(&left[9],left[8],9);

  232.         left[0] = left[1];

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

  234.         if(h->flags & C_AVAIL)

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

  236.         else

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

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

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

  240.         if(h->flags & B_AVAIL)

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

  242.         break;

  243.     case 2:

  244.         memcpy(&left[1],&h->left_border_y[8],8);

  245.         memset(&left[9],left[8],9);

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

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

  248.         left[0] = h->left_border_y[7];

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

  250.         if(h->flags & A_AVAIL)

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

  252.         break;

  253.     case 3:

  254.         for(i=0;i<9;i++)

  255.             left[i] = *(h->cy + 7 + (i+7)*h->l_stride);

  256.         memset(&left[9],left[8],9);

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

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

  259.         break;

  260.     }

  261. }

  262. 

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

  264.     int y;

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

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

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

  268.     }

  269. }

  270. 

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

  272.     int y;

  273.     uint64_t a;

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

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

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

  277.     }

  278. }

  279. 

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

  281.     int y;

  282.     uint64_t a = 0x8080808080808080ULL;

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

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

  285. }

  286. 

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

  288.     int x,y,ia;

  289.     int ih = 0;

  290.     int iv = 0;

  291.     uint8_t *cm = cropTbl + MAX_NEG_CROP;

  292. 

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

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

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

  296.     }

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

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

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

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

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

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

  303. }

  304. 

  305. #define LOWPASS(ARRAY,INDEX)                                            \

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

  307. 

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

  309.     int x,y;

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

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

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

  313. }

  314. 

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

  316.     int x,y;

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

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

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

  320. }

  321. 

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

  323.     int x,y;

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

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

  326.             if(x==y)

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

  328.             else if(x>y)

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

  330.             else

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

  332. }

  333. 

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

  335.     int x,y;

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

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

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

  339. }

  340. 

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

  342.     int x,y;

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

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

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

  346. }

  347. 

  348. #undef LOWPASS

  349. 

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

  351.     *mode = mod_table[*mode];

  352.     if(*mode < 0) {

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

  354.         *mode = 0;

  355.     }

  356. }

  357. 

  358. /*****************************************************************************

  359.  *

  360.  * motion compensation

  361.  *

  362.  ****************************************************************************/

  363. 

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

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

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

  367.                         int src_y_offset,qpel_mc_func *qpix_op,

  368.                         h264_chroma_mc_func chroma_op,vector_t *mv){

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

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

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

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

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

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

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

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

  377.     int extra_height= extra_width;

  378.     int emu=0;

  379.     const int full_mx= mx>>2;

  380.     const int full_my= my>>2;

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

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

  383. 

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

  385.         return;

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

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

  388. 

  389.     if(   full_mx < 0-extra_width

  390.           || full_my < 0-extra_height

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

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

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

  394.                             16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);

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

  396.         emu=1;

  397.     }

  398. 

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

  400.     if(!square){

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

  402.     }

  403. 

  404.     if(emu){

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

  406.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  407.         src_cb= s->edge_emu_buffer;

  408.     }

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

  410. 

  411.     if(emu){

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

  413.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  414.         src_cr= s->edge_emu_buffer;

  415.     }

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

  417. }

  418. 

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

  420.                         uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,

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

  422.                         h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,

  423.                         h264_chroma_mc_func chroma_avg, vector_t *mv){

  424.     qpel_mc_func *qpix_op=  qpix_put;

  425.     h264_chroma_mc_func chroma_op= chroma_put;

  426. 

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

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

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

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

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

  432. 

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

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

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

  436.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  437.                     qpix_op, chroma_op, mv);

  438. 

  439.         qpix_op=  qpix_avg;

  440.         chroma_op= chroma_avg;

  441.     }

  442. 

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

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

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

  446.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  447.                     qpix_op, chroma_op, mv+MV_BWD_OFFS);

  448.     }

  449. }

  450. 

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

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

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

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

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

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

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

  458.     }else{

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  479.     }

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

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

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

  483. }

  484. 

  485. /*****************************************************************************

  486.  *

  487.  * motion vector prediction

  488.  *

  489.  ****************************************************************************/

  490. 

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

  492.     switch(size) {

  493.     case BLK_16X16:

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

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

  496.     case BLK_16X8:

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

  498.         break;

  499.     case BLK_8X16:

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

  501.         break;

  502.     }

  503. }

  504. 

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

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

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

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

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

  510. }

  511. 

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

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

  514. 

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

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

  517. }

  518. 

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

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

  521.     int len_ab, len_bc, len_ca, len_mid;

  522. 

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

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

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

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

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

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

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

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

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

  532.     if(len_mid == len_ab) {

  533.         mvP->x = cx;

  534.         mvP->y = cy;

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

  536.         mvP->x = ax;

  537.         mvP->y = ay;

  538.     } else {

  539.         mvP->x = bx;

  540.         mvP->y = by;

  541.     }

  542. }

  543. 

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

  545.                                   vector_t *col_mv) {

  546.     vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS;

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

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

  549. 

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

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

  552.     pmv_fw->ref = 1;

  553.     pmv_bw->ref = 0;

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

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

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

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

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

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

  560. }

  561. 

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

  563.     vector_t *dst = src + MV_BWD_OFFS;

  564. 

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

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

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

  568.     dst->ref = 0;

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

  570.     set_mvs(dst, size);

  571. }

  572. 

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

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

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

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

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

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

  579.     vector_t *mvP2 = NULL;

  580. 

  581.     mvP->ref = ref;

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

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

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

  585.     if(mode == MV_PRED_PSKIP) {

  586.         if((mvA->ref == NOT_AVAIL) || (mvB->ref == NOT_AVAIL) ||

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

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

  589.             mvP->x = mvP->y = 0;

  590.             set_mvs(mvP,size);

  591.             return;

  592.         }

  593.     }

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

  595.     if((mvA->ref >= 0) && (mvB->ref < 0) && (mvC->ref < 0)) {

  596.         mvP2= mvA;

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

  598.         mvP2= mvB;

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

  600.         mvP2= mvC;

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

  602.         mvP2= mvA;

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

  604.         mvP2= mvB;

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

  606.         mvP2= mvC;

  607.     }

  608.     if(mvP2){

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

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

  611.     }else

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

  613. 

  614.     if(mode < MV_PRED_PSKIP) {

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

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

  617.     }

  618.     set_mvs(mvP,size);

  619. }

  620. 

  621. /*****************************************************************************

  622.  *

  623.  * residual data decoding

  624.  *

  625.  ****************************************************************************/

  626. 

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

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

  629.     if(order) {

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

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

  632.     }

  633.     return get_ue_golomb(gb);

  634. }

  635. 

  636. /**

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

  638.  *  and add them to sample block

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

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

  641.  * @param qp quantizer

  642.  * @param dst location of sample block

  643.  * @param stride line stride in frame buffer

  644.  */

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

  646.                                  const residual_vlc_t *r, int esc_golomb_order,

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

  648.     int i,pos = -1;

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

  650.     int level_buf[64];

  651.     int run_buf[64];

  652.     int dqm = dequant_mul[qp];

  653.     int dqs = dequant_shift[qp];

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

  655.     const uint8_t *scantab = ff_zigzag_direct;

  656.     DCTELEM block[64];

  657. 

  658.     memset(block,0,64*sizeof(DCTELEM));

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

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

  661.         if(level_code >= ESCAPE_CODE) {

  662.             run = (level_code - ESCAPE_CODE) >> 1;

  663.             esc_code = get_ue_code(gb,esc_golomb_order);

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

  665.             while(level > r->inc_limit)

  666.                 r++;

  667.             mask = -(level_code & 1);

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

  669.         } else {

  670.             if(level_code < 0)

  671.                 return -1;

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

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

  674.                 break;

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

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

  677.         }

  678.         level_buf[i] = level;

  679.         run_buf[i] = run;

  680.     }

  681.     /* inverse scan and dequantization */

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

  683.         pos += 1 + run_buf[i];

  684.         if(pos > 63) {

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

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

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

  688.             return -1;

  689.         }

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

  691.     }

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

  693.     return 0;

  694. }

  695. 

  696. 

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

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

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

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

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

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

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

  704. }

  705. 

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

  707.     int block;

  708. 

  709.     /* get coded block pattern */

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

  711.     if(cbp > 63){

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

  713.         return -1;

  714.     }

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

  716. 

  717.     /* get quantizer */

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

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

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

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

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

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

  724.     decode_residual_chroma(h);

  725. 

  726.     return 0;

  727. }

  728. 

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

  730.  *

  731.  * macroblock level

  732.  *

  733.  ****************************************************************************/

  734. 

  735. /**

  736.  * initialise predictors for motion vectors and intra prediction

  737.  */

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

  739.     int i;

  740. 

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

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

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

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

  745.     }

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

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

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

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

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

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

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

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

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

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

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

  757.         h->flags |= D_AVAIL;

  758.     }

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

  760.         h->flags &= ~C_AVAIL;

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

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

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

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

  765.     }

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

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

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

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

  770.     }

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

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

  773. }

  774. 

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

  776. 

  777. /**

  778.  * save predictors for later macroblocks and increase

  779.  * macroblock address

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

  781.  */

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

  783.     int i;

  784. 

  785.     h->flags |= A_AVAIL;

  786.     h->cy += 16;

  787.     h->cu += 8;

  788.     h->cv += 8;

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

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

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

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

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

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

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

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

  797.     /* next MB address */

  798.     h->mbx++;

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

  800.         h->flags = B_AVAIL|C_AVAIL;

  801.         /* clear left pred_modes */

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

  803.         /* clear left mv predictors */

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

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

  806.         h->mbx = 0;

  807.         h->mby++;

  808.         /* re-calculate sample pointers */

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

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

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

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

  813.             return 0;

  814.         } else {

  815.             //check_for_slice(h);

  816.         }

  817.     }

  818.     return 1;

  819. }

  820. 

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

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

  823.     int block, pred_mode_uv;

  824.     uint8_t top[18];

  825.     uint8_t left[18];

  826.     uint8_t *d;

  827. 

  828.     init_mb(h);

  829. 

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

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

  832.         int nA,nB,predpred;

  833.         int pos = scan3x3[block];

  834. 

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

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

  837.         predpred = FFMIN(nA,nB);

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

  839.             predpred = INTRA_L_LP;

  840.         if(!get_bits1(gb)){

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

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

  843.         }

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

  845.     }

  846.     pred_mode_uv = get_ue_golomb(gb);

  847.     if(pred_mode_uv > 6) {

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

  849.         return -1;

  850.     }

  851. 

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

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

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

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

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

  857. 

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

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

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

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

  862.         modify_pred(left_modifier_c, &pred_mode_uv );

  863.     }

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

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

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

  867.         modify_pred(top_modifier_c, &pred_mode_uv );

  868.     }

  869. 

  870.     /* get coded block pattern */

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

  872.         cbp_code = get_ue_golomb(gb);

  873.     if(cbp_code > 63){

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

  875.         return -1;

  876.     }

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

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

  879.         h->qp += get_se_golomb(gb); //qp_delta

  880. 

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

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

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

  884.         load_intra_pred_luma(h, top, left, block);

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

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

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

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

  889.     }

  890. 

  891.     /* chroma intra prediction */

  892.     /* extend borders by one pixel */

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

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

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

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

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

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

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

  900.     } else {

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

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

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

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

  905.     }

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

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

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

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

  910. 

  911.     decode_residual_chroma(h);

  912.     filter_mb(h,I_8X8);

  913. 

  914.     /* mark motion vectors as intra */

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

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

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

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

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

  920.         *h->col_type = I_8X8;

  921. 

  922.     return 0;

  923. }

  924. 

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

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

  927.     int ref[4];

  928. 

  929.     init_mb(h);

  930.     switch(mb_type) {

  931.     case P_SKIP:

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

  933.         break;

  934.     case P_16X16:

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

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

  937.         break;

  938.     case P_16X8:

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

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

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

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

  943.         break;

  944.     case P_8X16:

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

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

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

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

  949.         break;

  950.     case P_8X8:

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

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

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

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

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

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

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

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

  959.     }

  960.     inter_pred(h, mb_type);

  961.     store_mvs(h);

  962.     if(mb_type != P_SKIP)

  963.         decode_residual_inter(h);

  964.     filter_mb(h,mb_type);

  965.     *h->col_type = mb_type;

  966. }

  967. 

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

  969.     int block;

  970.     enum sub_mb_t sub_type[4];

  971.     int flags;

  972. 

  973.     init_mb(h);

  974. 

  975.     /* reset all MVs */

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

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

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

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

  980.     switch(mb_type) {

  981.     case B_SKIP:

  982.     case B_DIRECT:

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

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

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

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

  987.         } else

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

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

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

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

  992.         break;

  993.     case B_FWD_16X16:

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

  995.         break;

  996.     case B_SYM_16X16:

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

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

  999.         break;

  1000.     case B_BWD_16X16:

  1001.         mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);

  1002.         break;

  1003.     case B_8X8:

  1004.         for(block=0;block<4;block++)

  1005.             sub_type[block] = get_bits(&h->s.gb,2);

  1006.         for(block=0;block<4;block++) {

  1007.             switch(sub_type[block]) {

  1008.             case B_SUB_DIRECT:

  1009.                 if(!(*h->col_type)) {

  1010.                     /* intra MB at co-location, do in-plane prediction */

  1011.                     mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1012.                             MV_PRED_BSKIP, BLK_8X8, 1);

  1013.                     mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1014.                             mv_scan[block]-3+MV_BWD_OFFS,

  1015.                             MV_PRED_BSKIP, BLK_8X8, 0);

  1016.                 } else

  1017.                     mv_pred_direct(h,&h->mv[mv_scan[block]],

  1018.                                    &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);

  1019.                 break;

  1020.             case B_SUB_FWD:

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

  1022.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1023.                 break;

  1024.             case B_SUB_SYM:

  1025.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1026.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1027.                 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);

  1028.                 break;

  1029.             }

  1030.         }

  1031.         for(block=0;block<4;block++) {

  1032.             if(sub_type[block] == B_SUB_BWD)

  1033.                 mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1034.                         mv_scan[block]+MV_BWD_OFFS-3,

  1035.                         MV_PRED_MEDIAN, BLK_8X8, 0);

  1036.         }

  1037.         break;

  1038.     default:

  1039.         assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));

  1040.         flags = partition_flags[mb_type];

  1041.         if(mb_type & 1) { /* 16x8 macroblock types */

  1042.             if(flags & FWD0)

  1043.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1044.             if(flags & SYM0) {

  1045.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1046.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);

  1047.             }

  1048.             if(flags & FWD1)

  1049.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1050.             if(flags & SYM1) {

  1051.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1052.                 mv_pred_sym(h, &h->mv[9], BLK_16X8);

  1053.             }

  1054.             if(flags & BWD0)

  1055.                 mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP,  BLK_16X8, 0);

  1056.             if(flags & BWD1)

  1057.                 mv_pred(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);

  1058.         } else {          /* 8x16 macroblock types */

  1059.             if(flags & FWD0)

  1060.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1061.             if(flags & SYM0) {

  1062.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1063.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);

  1064.             }

  1065.             if(flags & FWD1)

  1066.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1067.             if(flags & SYM1) {

  1068.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1069.                 mv_pred_sym(h, &h->mv[6], BLK_8X16);

  1070.             }

  1071.             if(flags & BWD0)

  1072.                 mv_pred(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);

  1073.             if(flags & BWD1)

  1074.                 mv_pred(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 0);

  1075.         }

  1076.     }

  1077.     inter_pred(h, mb_type);

  1078.     if(mb_type != B_SKIP)

  1079.         decode_residual_inter(h);

  1080.     filter_mb(h,mb_type);

  1081. }

  1082. 

  1083. /*****************************************************************************

  1084.  *

  1085.  * slice level

  1086.  *

  1087.  ****************************************************************************/

  1088. 

  1089. static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {

  1090.     if(h->stc > 0xAF)

  1091.         av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);

  1092.     h->mby = h->stc;

  1093.     if((h->mby == 0) && (!h->qp_fixed)){

  1094.         h->qp_fixed = get_bits1(gb);

  1095.         h->qp = get_bits(gb,6);

  1096.     }

  1097.     /* inter frame or second slice can have weighting params */

  1098.     if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2))

  1099.         if(get_bits1(gb)) { //slice_weighting_flag

  1100.             av_log(h->s.avctx, AV_LOG_ERROR,

  1101.                    "weighted prediction not yet supported\n");

  1102.         }

  1103.     return 0;

  1104. }

  1105. 

  1106. static inline void check_for_slice(AVSContext *h) {

  1107.     GetBitContext *gb = &h->s.gb;

  1108.     int align;

  1109.     align = (-get_bits_count(gb)) & 7;

  1110.     if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {

  1111.         get_bits_long(gb,24+align);

  1112.         h->stc = get_bits(gb,8);

  1113.         decode_slice_header(h,gb);

  1114.     }

  1115. }

  1116. 

  1117. /*****************************************************************************

  1118.  *

  1119.  * frame level

  1120.  *

  1121.  ****************************************************************************/

  1122. 

  1123. static void init_pic(AVSContext *h) {

  1124.     int i;

  1125. 

  1126.     /* clear some predictors */

  1127.     for(i=0;i<=20;i+=4)

  1128.         h->mv[i] = un_mv;

  1129.     h->mv[MV_BWD_X0] = dir_mv;

  1130.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1131.     h->mv[MV_FWD_X0] = dir_mv;

  1132.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1133.     h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;

  1134.     h->cy = h->picture.data[0];

  1135.     h->cu = h->picture.data[1];

  1136.     h->cv = h->picture.data[2];

  1137.     h->l_stride = h->picture.linesize[0];

  1138.     h->c_stride = h->picture.linesize[1];

  1139.     h->luma_scan[2] = 8*h->l_stride;

  1140.     h->luma_scan[3] = 8*h->l_stride+8;

  1141.     h->mbx = h->mby = 0;

  1142.     h->flags = 0;

  1143. }

  1144. 

  1145. static int decode_pic(AVSContext *h) {

  1146.     MpegEncContext *s = &h->s;

  1147.     int skip_count;

  1148.     enum mb_t mb_type;

  1149. 

  1150.     if (!s->context_initialized) {

  1151.         if (MPV_common_init(s) < 0)

  1152.             return -1;

  1153.     }

  1154.     get_bits(&s->gb,16);//bbv_dwlay

  1155.     if(h->stc == PIC_PB_START_CODE) {

  1156.         h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE;

  1157.         /* make sure we have the reference frames we need */

  1158.         if(!h->DPB[0].data[0] ||

  1159.           (!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE))

  1160.             return -1;

  1161.     } else {

  1162.         h->pic_type = FF_I_TYPE;

  1163.         if(get_bits1(&s->gb))

  1164.             get_bits(&s->gb,16);//time_code

  1165.     }

  1166.     /* release last B frame */

  1167.     if(h->picture.data[0])

  1168.         s->avctx->release_buffer(s->avctx, (AVFrame *)&h->picture);

  1169. 

  1170.     s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture);

  1171.     init_pic(h);

  1172.     h->picture.poc = get_bits(&s->gb,8)*2;

  1173. 

  1174.     /* get temporal distances and MV scaling factors */

  1175.     if(h->pic_type != FF_B_TYPE) {

  1176.         h->dist[0] = (h->picture.poc - h->DPB[0].poc  + 512) % 512;

  1177.     } else {

  1178.         h->dist[0] = (h->DPB[0].poc  - h->picture.poc + 512) % 512;

  1179.     }

  1180.     h->dist[1] = (h->picture.poc - h->DPB[1].poc  + 512) % 512;

  1181.     h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;

  1182.     h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;

  1183.     if(h->pic_type == FF_B_TYPE) {

  1184.         h->sym_factor = h->dist[0]*h->scale_den[1];

  1185.     } else {

  1186.         h->direct_den[0] = h->dist[0] ? 16384/h->dist[0] : 0;

  1187.         h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0;

  1188.     }

  1189. 

  1190.     if(s->low_delay)

  1191.         get_ue_golomb(&s->gb); //bbv_check_times

  1192.     h->progressive             = get_bits1(&s->gb);

  1193.     if(h->progressive)

  1194.         h->pic_structure = 1;

  1195.     else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) )

  1196.         get_bits1(&s->gb);     //advanced_pred_mode_disable

  1197.     skip_bits1(&s->gb);        //top_field_first

  1198.     skip_bits1(&s->gb);        //repeat_first_field

  1199.     h->qp_fixed                = get_bits1(&s->gb);

  1200.     h->qp                      = get_bits(&s->gb,6);

  1201.     if(h->pic_type == FF_I_TYPE) {

  1202.         if(!h->progressive && !h->pic_structure)

  1203.             skip_bits1(&s->gb);//what is this?

  1204.         skip_bits(&s->gb,4);   //reserved bits

  1205.     } else {

  1206.         if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1))

  1207.             h->ref_flag        = get_bits1(&s->gb);

  1208.         skip_bits(&s->gb,4);   //reserved bits

  1209.         h->skip_mode_flag      = get_bits1(&s->gb);

  1210.     }

  1211.     h->loop_filter_disable     = get_bits1(&s->gb);

  1212.     if(!h->loop_filter_disable && get_bits1(&s->gb)) {

  1213.         h->alpha_offset        = get_se_golomb(&s->gb);

  1214.         h->beta_offset         = get_se_golomb(&s->gb);

  1215.     } else {

  1216.         h->alpha_offset = h->beta_offset  = 0;

  1217.     }

  1218.     check_for_slice(h);

  1219.     if(h->pic_type == FF_I_TYPE) {

  1220.         do {

  1221.             decode_mb_i(h, 0);

  1222.         } while(next_mb(h));

  1223.     } else if(h->pic_type == FF_P_TYPE) {

  1224.         do {

  1225.             if(h->skip_mode_flag) {

  1226.                 skip_count = get_ue_golomb(&s->gb);

  1227.                 while(skip_count--) {

  1228.                     decode_mb_p(h,P_SKIP);

  1229.                     if(!next_mb(h))

  1230.                         goto done;

  1231.                 }

  1232.                 mb_type = get_ue_golomb(&s->gb) + P_16X16;

  1233.             } else

  1234.                 mb_type = get_ue_golomb(&s->gb) + P_SKIP;

  1235.             if(mb_type > P_8X8) {

  1236.                 decode_mb_i(h, mb_type - P_8X8 - 1);

  1237.             } else

  1238.                 decode_mb_p(h,mb_type);

  1239.         } while(next_mb(h));

  1240.     } else { /* FF_B_TYPE */

  1241.         do {

  1242.             if(h->skip_mode_flag) {

  1243.                 skip_count = get_ue_golomb(&s->gb);

  1244.                 while(skip_count--) {

  1245.                     decode_mb_b(h,B_SKIP);

  1246.                     if(!next_mb(h))

  1247.                         goto done;

  1248.                 }

  1249.                 mb_type = get_ue_golomb(&s->gb) + B_DIRECT;

  1250.             } else

  1251.                 mb_type = get_ue_golomb(&s->gb) + B_SKIP;

  1252.             if(mb_type > B_8X8) {

  1253.                 decode_mb_i(h, mb_type - B_8X8 - 1);

  1254.             } else

  1255.                 decode_mb_b(h,mb_type);

  1256.         } while(next_mb(h));

  1257.     }

  1258.  done:

  1259.     if(h->pic_type != FF_B_TYPE) {

  1260.         if(h->DPB[1].data[0])

  1261.             s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]);

  1262.         memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture));

  1263.         memcpy(&h->DPB[0], &h->picture, sizeof(Picture));

  1264.         memset(&h->picture,0,sizeof(Picture));

  1265.     }

  1266.     return 0;

  1267. }

  1268. 

  1269. /*****************************************************************************

  1270.  *

  1271.  * headers and interface

  1272.  *

  1273.  ****************************************************************************/

  1274. 

  1275. /**

  1276.  * some predictions require data from the top-neighbouring macroblock.

  1277.  * this data has to be stored for one complete row of macroblocks

  1278.  * and this storage space is allocated here

  1279.  */

  1280. static void init_top_lines(AVSContext *h) {

  1281.     /* alloc top line of predictors */

  1282.     h->top_qp       = av_malloc( h->mb_width);

  1283.     h->top_mv[0]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1284.     h->top_mv[1]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1285.     h->top_pred_Y   = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));

  1286.     h->top_border_y = av_malloc((h->mb_width+1)*16);

  1287.     h->top_border_u = av_malloc((h->mb_width)*10);

  1288.     h->top_border_v = av_malloc((h->mb_width)*10);

  1289. 

  1290.     /* alloc space for co-located MVs and types */

  1291.     h->col_mv       = av_malloc( h->mb_width*h->mb_height*4*sizeof(vector_t));

  1292.     h->col_type_base = av_malloc(h->mb_width*h->mb_height);

  1293. }

  1294. 

  1295. static int decode_seq_header(AVSContext *h) {

  1296.     MpegEncContext *s = &h->s;

  1297.     extern const AVRational ff_frame_rate_tab[];

  1298.     int frame_rate_code;

  1299. 

  1300.     h->profile =         get_bits(&s->gb,8);

  1301.     h->level =           get_bits(&s->gb,8);

  1302.     skip_bits1(&s->gb); //progressive sequence

  1303.     s->width =           get_bits(&s->gb,14);

  1304.     s->height =          get_bits(&s->gb,14);

  1305.     skip_bits(&s->gb,2); //chroma format

  1306.     skip_bits(&s->gb,3); //sample_precision

  1307.     h->aspect_ratio =    get_bits(&s->gb,4);

  1308.     frame_rate_code =    get_bits(&s->gb,4);

  1309.     skip_bits(&s->gb,18);//bit_rate_lower

  1310.     skip_bits1(&s->gb);  //marker_bit

  1311.     skip_bits(&s->gb,12);//bit_rate_upper

  1312.     s->low_delay =       get_bits1(&s->gb);

  1313.     h->mb_width  = (s->width  + 15) >> 4;

  1314.     h->mb_height = (s->height + 15) >> 4;

  1315.     h->s.avctx->time_base.den = ff_frame_rate_tab[frame_rate_code].num;

  1316.     h->s.avctx->time_base.num = ff_frame_rate_tab[frame_rate_code].den;

  1317.     h->s.avctx->width  = s->width;

  1318.     h->s.avctx->height = s->height;

  1319.     if(!h->top_qp)

  1320.         init_top_lines(h);

  1321.     return 0;

  1322. }

  1323. 

  1324. /**

  1325.  * finds the end of the current frame in the bitstream.

  1326.  * @return the position of the first byte of the next frame, or -1

  1327.  */

  1328. int ff_cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) {

  1329.     int pic_found, i;

  1330.     uint32_t state;

  1331. 

  1332.     pic_found= pc->frame_start_found;

  1333.     state= pc->state;

  1334. 

  1335.     i=0;

  1336.     if(!pic_found){

  1337.         for(i=0; i<buf_size; i++){

  1338.             state= (state<<8) | buf[i];

  1339.             if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){

  1340.                 i++;

  1341.                 pic_found=1;

  1342.                 break;

  1343.             }

  1344.         }

  1345.     }

  1346. 

  1347.     if(pic_found){

  1348.         /* EOF considered as end of frame */

  1349.         if (buf_size == 0)

  1350.             return 0;

  1351.         for(; i<buf_size; i++){

  1352.             state= (state<<8) | buf[i];

  1353.             if((state&0xFFFFFF00) == 0x100){

  1354.                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){

  1355.                     pc->frame_start_found=0;

  1356.                     pc->state=-1;

  1357.                     return i-3;

  1358.                 }

  1359.             }

  1360.         }

  1361.     }

  1362.     pc->frame_start_found= pic_found;

  1363.     pc->state= state;

  1364.     return END_NOT_FOUND;

  1365. }

  1366. 

  1367. void ff_cavs_flush(AVCodecContext * avctx) {

  1368.     AVSContext *h = avctx->priv_data;

  1369.     h->got_keyframe = 0;

  1370. }

  1371. 

  1372. static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size,

  1373.                              uint8_t * buf, int buf_size) {

  1374.     AVSContext *h = avctx->priv_data;

  1375.     MpegEncContext *s = &h->s;

  1376.     int input_size;

  1377.     const uint8_t *buf_end;

  1378.     const uint8_t *buf_ptr;

  1379.     AVFrame *picture = data;

  1380.     uint32_t stc;

  1381. 

  1382.     s->avctx = avctx;

  1383. 

  1384.     if (buf_size == 0) {

  1385.         if(!s->low_delay && h->DPB[0].data[0]) {

  1386.             *data_size = sizeof(AVPicture);

  1387.             *picture = *(AVFrame *) &h->DPB[0];

  1388.         }

  1389.         return 0;

  1390.     }

  1391. 

  1392.     buf_ptr = buf;

  1393.     buf_end = buf + buf_size;

  1394.     for(;;) {

  1395.         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &stc);

  1396.         if(stc & 0xFFFFFE00)

  1397.             return FFMAX(0, buf_ptr - buf - s->parse_context.last_index);

  1398.         input_size = (buf_end - buf_ptr)*8;

  1399.         switch(stc) {

  1400.         case SEQ_START_CODE:

  1401.             init_get_bits(&s->gb, buf_ptr, input_size);

  1402.             decode_seq_header(h);

  1403.             break;

  1404.         case PIC_I_START_CODE:

  1405.             if(!h->got_keyframe) {

  1406.                 if(h->DPB[0].data[0])

  1407.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[0]);

  1408.                 if(h->DPB[1].data[0])

  1409.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[1]);

  1410.                 h->got_keyframe = 1;

  1411.             }

  1412.         case PIC_PB_START_CODE:

  1413.             *data_size = 0;

  1414.             if(!h->got_keyframe)

  1415.                 break;

  1416.             init_get_bits(&s->gb, buf_ptr, input_size);

  1417.             h->stc = stc;

  1418.             if(decode_pic(h))

  1419.                 break;

  1420.             *data_size = sizeof(AVPicture);

  1421.             if(h->pic_type != FF_B_TYPE) {

  1422.                 if(h->DPB[1].data[0]) {

  1423.                     *picture = *(AVFrame *) &h->DPB[1];

  1424.                 } else {

  1425.                     *data_size = 0;

  1426.                 }

  1427.             } else

  1428.                 *picture = *(AVFrame *) &h->picture;

  1429.             break;

  1430.         case EXT_START_CODE:

  1431.             //mpeg_decode_extension(avctx,buf_ptr, input_size);

  1432.             break;

  1433.         case USER_START_CODE:

  1434.             //mpeg_decode_user_data(avctx,buf_ptr, input_size);

  1435.             break;

  1436.         default:

  1437.             if (stc >= SLICE_MIN_START_CODE &&

  1438.                 stc <= SLICE_MAX_START_CODE) {

  1439.                 init_get_bits(&s->gb, buf_ptr, input_size);

  1440.                 decode_slice_header(h, &s->gb);

  1441.             }

  1442.             break;

  1443.         }

  1444.     }

  1445. }

  1446. 

  1447. static int cavs_decode_init(AVCodecContext * avctx) {

  1448.     AVSContext *h = avctx->priv_data;

  1449.     MpegEncContext * const s = &h->s;

  1450. 

  1451.     MPV_decode_defaults(s);

  1452.     s->avctx = avctx;

  1453. 

  1454.     avctx->pix_fmt= PIX_FMT_YUV420P;

  1455. 

  1456.     h->luma_scan[0] = 0;

  1457.     h->luma_scan[1] = 8;

  1458.     h->intra_pred_l[      INTRA_L_VERT] = intra_pred_vert;

  1459.     h->intra_pred_l[     INTRA_L_HORIZ] = intra_pred_horiz;

  1460.     h->intra_pred_l[        INTRA_L_LP] = intra_pred_lp;

  1461.     h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;

  1462.     h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;

  1463.     h->intra_pred_l[   INTRA_L_LP_LEFT] = intra_pred_lp_left;

  1464.     h->intra_pred_l[    INTRA_L_LP_TOP] = intra_pred_lp_top;

  1465.     h->intra_pred_l[    INTRA_L_DC_128] = intra_pred_dc_128;

  1466.     h->intra_pred_c[        INTRA_C_LP] = intra_pred_lp;

  1467.     h->intra_pred_c[     INTRA_C_HORIZ] = intra_pred_horiz;

  1468.     h->intra_pred_c[      INTRA_C_VERT] = intra_pred_vert;

  1469.     h->intra_pred_c[     INTRA_C_PLANE] = intra_pred_plane;

  1470.     h->intra_pred_c[   INTRA_C_LP_LEFT] = intra_pred_lp_left;

  1471.     h->intra_pred_c[    INTRA_C_LP_TOP] = intra_pred_lp_top;

  1472.     h->intra_pred_c[    INTRA_C_DC_128] = intra_pred_dc_128;

  1473.     h->mv[ 7] = un_mv;

  1474.     h->mv[19] = un_mv;

  1475.     return 0;

  1476. }

  1477. 

  1478. static int cavs_decode_end(AVCodecContext * avctx) {

  1479.     AVSContext *h = avctx->priv_data;

  1480. 

  1481.     av_free(h->top_qp);

  1482.     av_free(h->top_mv[0]);

  1483.     av_free(h->top_mv[1]);

  1484.     av_free(h->top_pred_Y);

  1485.     av_free(h->top_border_y);

  1486.     av_free(h->top_border_u);

  1487.     av_free(h->top_border_v);

  1488.     av_free(h->col_mv);

  1489.     av_free(h->col_type_base);

  1490.     return 0;

  1491. }

  1492. 

  1493. AVCodec cavs_decoder = {

  1494.     "cavs",

  1495.     CODEC_TYPE_VIDEO,

  1496.     CODEC_ID_CAVS,

  1497.     sizeof(AVSContext),

  1498.     cavs_decode_init,

  1499.     NULL,

  1500.     cavs_decode_end,

  1501.     cavs_decode_frame,

  1502.     CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1503.     .flush= ff_cavs_flush,

  1504. };