falkTX
/
FFmpeg
mirror of https://github.com/falkTX/FFmpeg.git
1
0
Fork 0
Code Issues 0 Releases 338 Wiki Activity
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
6000 Commits
32 Branches
313MB
Tree: a08d38ee82
Branches Tags
${ item.name }
Create branch ${ searchTerm }
from 'a08d38ee82'
${ noResults }
FFmpeg/libavcodec/cavs.c

1570 lines
54KB
Raw Blame History 

  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_p(vector_t *mvP, vector_t *mvQ) {

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

  109.         return 2;

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

  111.         return 1;

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

  113.         return 1;

  114.     return 0;

  115. }

  116. 

  117. static inline int get_bs_b(vector_t *mvP, vector_t *mvQ) {

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

  119.         return 2;

  120.     } else {

  121.         vector_t *mvPbw = mvP + MV_BWD_OFFS;

  122.         vector_t *mvQbw = mvQ + MV_BWD_OFFS;

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

  124.             (abs(  mvP->y -   mvQ->y) >= 4) ||

  125.             (abs(mvPbw->x - mvQbw->x) >= 4) ||

  126.             (abs(mvPbw->y - mvQbw->y) >= 4) )

  127.             return 1;

  128.     }

  129.     return 0;

  130. }

  131. 

  132. #define SET_PARAMS                                            \

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

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

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

  136. 

  137. /**

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

  139.  *

  140.  * boundary strength (bs) mapping:

  141.  *

  142.  * --4---5--

  143.  * 0   2   |

  144.  * | 6 | 7 |

  145.  * 1   3   |

  146.  * ---------

  147.  *

  148.  */

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

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

  151.     int qp_avg, alpha, beta, tc;

  152.     int i;

  153. 

  154.     /* save un-deblocked lines */

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

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

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

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

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

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

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

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

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

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

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

  166.     }

  167.     if(!h->loop_filter_disable) {

  168.         /* clear bs */

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

  170.         /* determine bs */

  171.         switch(mb_type) {

  172.         case I_8X8:

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

  174.             break;

  175.         case P_8X8:

  176.         case P_8X16:

  177.             bs[2] = get_bs_p(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1]);

  178.             bs[3] = get_bs_p(&h->mv[MV_FWD_X2], &h->mv[MV_FWD_X3]);

  179.         case P_16X8:

  180.             bs[6] = get_bs_p(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2]);

  181.             bs[7] = get_bs_p(&h->mv[MV_FWD_X1], &h->mv[MV_FWD_X3]);

  182.         case P_16X16:

  183.         case P_SKIP:

  184.             bs[0] = get_bs_p(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0]);

  185.             bs[1] = get_bs_p(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2]);

  186.             bs[4] = get_bs_p(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0]);

  187.             bs[5] = get_bs_p(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1]);

  188.             break;

  189.         case B_SKIP:

  190.         case B_DIRECT:

  191.         case B_8X8:

  192.             bs[2] = get_bs_b(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1]);

  193.             bs[3] = get_bs_b(&h->mv[MV_FWD_X2], &h->mv[MV_FWD_X3]);

  194.             bs[6] = get_bs_b(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2]);

  195.             bs[7] = get_bs_b(&h->mv[MV_FWD_X1], &h->mv[MV_FWD_X3]);

  196.         case B_FWD_16X16:

  197.         case B_BWD_16X16:

  198.         case B_SYM_16X16:

  199.             bs[0] = get_bs_b(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0]);

  200.             bs[1] = get_bs_b(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2]);

  201.             bs[4] = get_bs_b(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0]);

  202.             bs[5] = get_bs_b(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1]);

  203.             break;

  204.         default:

  205.             if(mb_type & 1) { //16X8

  206.                 bs[6] = bs[7] = get_bs_b(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2]);

  207.             } else {          //8X16

  208.                 bs[2] = bs[3] = get_bs_b(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1]);

  209.             }

  210.             bs[0] = get_bs_b(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0]);

  211.             bs[1] = get_bs_b(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2]);

  212.             bs[4] = get_bs_b(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0]);

  213.             bs[5] = get_bs_b(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1]);

  214.         }

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

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

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

  218.                 SET_PARAMS;

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

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

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

  222.             }

  223.             qp_avg = h->qp;

  224.             SET_PARAMS;

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

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

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

  228. 

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

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

  231.                 SET_PARAMS;

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

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

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

  235.             }

  236.         }

  237.     }

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

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

  240. }

  241. 

  242. #undef SET_PARAMS

  243. 

  244. /*****************************************************************************

  245.  *

  246.  * spatial intra prediction

  247.  *

  248.  ****************************************************************************/

  249. 

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

  251.                                         uint8_t *left, int block) {

  252.     int i;

  253. 

  254.     switch(block) {

  255.     case 0:

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

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

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

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

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

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

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

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

  264.         break;

  265.     case 1:

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

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

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

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

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

  271.         if(h->flags & C_AVAIL)

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

  273.         else

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

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

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

  277.         if(h->flags & B_AVAIL)

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

  279.         break;

  280.     case 2:

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

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

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

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

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

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

  287.         if(h->flags & A_AVAIL)

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

  289.         break;

  290.     case 3:

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

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

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

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

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

  296.         break;

  297.     }

  298. }

  299. 

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

  301.     int y;

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

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

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

  305.     }

  306. }

  307. 

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

  309.     int y;

  310.     uint64_t a;

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

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

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

  314.     }

  315. }

  316. 

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

  318.     int y;

  319.     uint64_t a = 0x8080808080808080ULL;

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

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

  322. }

  323. 

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

  325.     int x,y,ia;

  326.     int ih = 0;

  327.     int iv = 0;

  328.     uint8_t *cm = cropTbl + MAX_NEG_CROP;

  329. 

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

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

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

  333.     }

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

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

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

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

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

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

  340. }

  341. 

  342. #define LOWPASS(ARRAY,INDEX)                                            \

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

  344. 

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

  346.     int x,y;

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

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

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

  350. }

  351. 

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

  353.     int x,y;

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

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

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

  357. }

  358. 

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

  360.     int x,y;

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

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

  363.             if(x==y)

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

  365.             else if(x>y)

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

  367.             else

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

  369. }

  370. 

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

  372.     int x,y;

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

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

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

  376. }

  377. 

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

  379.     int x,y;

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

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

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

  383. }

  384. 

  385. #undef LOWPASS

  386. 

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

  388.     *mode = mod_table[*mode];

  389.     if(*mode < 0) {

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

  391.         *mode = 0;

  392.     }

  393. }

  394. 

  395. /*****************************************************************************

  396.  *

  397.  * motion compensation

  398.  *

  399.  ****************************************************************************/

  400. 

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

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

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

  404.                         int src_y_offset,qpel_mc_func *qpix_op,

  405.                         h264_chroma_mc_func chroma_op,vector_t *mv){

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

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

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

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

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

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

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

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

  414.     int extra_height= extra_width;

  415.     int emu=0;

  416.     const int full_mx= mx>>2;

  417.     const int full_my= my>>2;

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

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

  420. 

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

  422.         return;

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

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

  425. 

  426.     if(   full_mx < 0-extra_width

  427.           || full_my < 0-extra_height

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

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

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

  431.                             16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);

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

  433.         emu=1;

  434.     }

  435. 

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

  437.     if(!square){

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

  439.     }

  440. 

  441.     if(emu){

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

  443.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  444.         src_cb= s->edge_emu_buffer;

  445.     }

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

  447. 

  448.     if(emu){

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

  450.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  451.         src_cr= s->edge_emu_buffer;

  452.     }

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

  454. }

  455. 

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

  457.                         uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,

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

  459.                         h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,

  460.                         h264_chroma_mc_func chroma_avg, vector_t *mv){

  461.     qpel_mc_func *qpix_op=  qpix_put;

  462.     h264_chroma_mc_func chroma_op= chroma_put;

  463. 

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

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

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

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

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

  469. 

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

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

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

  473.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  474.                     qpix_op, chroma_op, mv);

  475. 

  476.         qpix_op=  qpix_avg;

  477.         chroma_op= chroma_avg;

  478.     }

  479. 

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

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

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

  483.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  484.                     qpix_op, chroma_op, mv+MV_BWD_OFFS);

  485.     }

  486. }

  487. 

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

  489.     switch(mb_type) {

  490.     case P_SKIP:

  491.     case P_16X16:

  492.     case B_FWD_16X16:

  493.     case B_BWD_16X16:

  494.     case B_SYM_16X16:

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

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

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

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

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

  500.         break;

  501.     default:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  522.         break;

  523.     }

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

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

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

  527. }

  528. 

  529. /*****************************************************************************

  530.  *

  531.  * motion vector prediction

  532.  *

  533.  ****************************************************************************/

  534. 

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

  536.     switch(size) {

  537.     case BLK_16X16:

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

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

  540.     case BLK_16X8:

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

  542.         break;

  543.     case BLK_8X16:

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

  545.         break;

  546.     }

  547. }

  548. 

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

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

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

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

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

  554. }

  555. 

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

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

  558. 

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

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

  561. }

  562. 

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

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

  565.     int len_ab, len_bc, len_ca, len_mid;

  566. 

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

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

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

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

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

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

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

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

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

  576.     if(len_mid == len_ab) {

  577.         mvP->x = cx;

  578.         mvP->y = cy;

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

  580.         mvP->x = ax;

  581.         mvP->y = ay;

  582.     } else {

  583.         mvP->x = bx;

  584.         mvP->y = by;

  585.     }

  586. }

  587. 

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

  589.                                   vector_t *col_mv) {

  590.     vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS;

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

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

  593. 

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

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

  596.     pmv_fw->ref = 1;

  597.     pmv_bw->ref = 0;

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

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

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

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

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

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

  604. }

  605. 

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

  607.     vector_t *dst = src + MV_BWD_OFFS;

  608. 

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

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

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

  612.     dst->ref = 0;

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

  614.     set_mvs(dst, size);

  615. }

  616. 

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

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

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

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

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

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

  623.     int mvAref = mvA->ref;

  624.     int mvBref = mvB->ref;

  625.     int mvCref;

  626. 

  627.     mvP->ref = ref;

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

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

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

  631.     mvCref = mvC->ref;

  632.     if(mode == MV_PRED_PSKIP) {

  633.         if((mvAref == NOT_AVAIL) || (mvBref == NOT_AVAIL) ||

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

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

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

  637.             set_mvs(mvP,size);

  638.             return;

  639.         }

  640.     }

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

  642.     if((mvAref >= 0) && (mvBref < 0) && (mvCref < 0)) {

  643.         mvP->x = mvA->x;

  644.         mvP->y = mvA->y;

  645.     } else if((mvAref < 0) && (mvBref >= 0) && (mvCref < 0)) {

  646.         mvP->x = mvB->x;

  647.         mvP->y = mvB->y;

  648.     } else if((mvAref < 0) && (mvBref < 0) && (mvCref >= 0)) {

  649.         mvP->x = mvC->x;

  650.         mvP->y = mvC->y;

  651.     } else {

  652.         switch(mode) {

  653.         case MV_PRED_LEFT:

  654.             if(mvAref == mvP->ref) {

  655.                 mvP->x = mvA->x;

  656.                 mvP->y = mvA->y;

  657.             } else

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

  659.             break;

  660.         case MV_PRED_TOP:

  661.             if(mvBref == mvP->ref) {

  662.                 mvP->x = mvB->x;

  663.                 mvP->y = mvB->y;

  664.             } else

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

  666.             break;

  667.         case MV_PRED_TOPRIGHT:

  668.             if(mvCref == mvP->ref) {

  669.                 mvP->x = mvC->x;

  670.                 mvP->y = mvC->y;

  671.             } else

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

  673.             break;

  674.         default:

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

  676.             break;

  677.         }

  678.     }

  679.     if(mode < MV_PRED_PSKIP) {

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

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

  682.     }

  683.     set_mvs(mvP,size);

  684. }

  685. 

  686. /*****************************************************************************

  687.  *

  688.  * residual data decoding

  689.  *

  690.  ****************************************************************************/

  691. 

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

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

  694.     if(order) {

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

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

  697.     }

  698.     return get_ue_golomb(gb);

  699. }

  700. 

  701. /**

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

  703.  *  and add them to sample block

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

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

  706.  * @param qp quantizer

  707.  * @param dst location of sample block

  708.  * @param stride line stride in frame buffer

  709.  */

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

  711.                                  const residual_vlc_t *r, int esc_golomb_order,

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

  713.     int i,pos = -1;

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

  715.     int level_buf[64];

  716.     int run_buf[64];

  717.     int dqm = dequant_mul[qp];

  718.     int dqs = dequant_shift[qp];

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

  720.     const uint8_t *scantab = ff_zigzag_direct;

  721.     DCTELEM block[64];

  722. 

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

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

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

  726.         if(level_code >= ESCAPE_CODE) {

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

  728.             esc_code = get_ue_code(gb,esc_golomb_order);

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

  730.             while(level > r->inc_limit)

  731.                 r++;

  732.             mask = -(level_code & 1);

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

  734.         } else {

  735.             if(level_code < 0)

  736.                 return -1;

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

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

  739.                 break;

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

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

  742.         }

  743.         level_buf[i] = level;

  744.         run_buf[i] = run;

  745.     }

  746.     /* inverse scan and dequantization */

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

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

  749.         if(pos > 63) {

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

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

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

  753.             return -1;

  754.         }

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

  756.     }

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

  758.     return 0;

  759. }

  760. 

  761. 

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

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

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

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

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

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

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

  769. }

  770. 

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

  772.     int block;

  773. 

  774.     /* get coded block pattern */

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

  776.     if(cbp > 63){

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

  778.         return -1;

  779.     }

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

  781. 

  782.     /* get quantizer */

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

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

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

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

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

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

  789.     decode_residual_chroma(h);

  790. 

  791.     return 0;

  792. }

  793. 

  794. /*****************************************************************************

  795.  *

  796.  * macroblock level

  797.  *

  798.  ****************************************************************************/

  799. 

  800. /**

  801.  * initialise predictors for motion vectors and intra prediction

  802.  */

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

  804.     int i;

  805. 

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

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

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

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

  810.     }

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

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

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

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

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

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

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

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

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

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

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

  822.         h->flags |= D_AVAIL;

  823.     }

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

  825.         h->flags &= ~C_AVAIL;

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

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

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

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

  830.     }

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

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

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

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

  835.     }

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

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

  838. }

  839. 

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

  841. 

  842. /**

  843.  * save predictors for later macroblocks and increase

  844.  * macroblock address

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

  846.  */

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

  848.     int i;

  849. 

  850.     h->flags |= A_AVAIL;

  851.     h->cy += 16;

  852.     h->cu += 8;

  853.     h->cv += 8;

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

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

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

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

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

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

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

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

  862.     /* next MB address */

  863.     h->mbx++;

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

  865.         h->flags = B_AVAIL|C_AVAIL;

  866.         /* clear left pred_modes */

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

  868.         /* clear left mv predictors */

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

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

  871.         h->mbx = 0;

  872.         h->mby++;

  873.         /* re-calculate sample pointers */

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

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

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

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

  878.             return 0;

  879.         } else {

  880.             //check_for_slice(h);

  881.         }

  882.     }

  883.     return 1;

  884. }

  885. 

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

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

  888.     int block, pred_mode_uv;

  889.     uint8_t top[18];

  890.     uint8_t left[18];

  891.     uint8_t *d;

  892. 

  893.     init_mb(h);

  894. 

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

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

  897.         int nA,nB,predpred;

  898.         int pos = scan3x3[block];

  899. 

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

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

  902.         predpred = FFMIN(nA,nB);

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

  904.             predpred = INTRA_L_LP;

  905.         if(!get_bits1(gb)){

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

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

  908.         }

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

  910.     }

  911.     pred_mode_uv = get_ue_golomb(gb);

  912.     if(pred_mode_uv > 6) {

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

  914.         return -1;

  915.     }

  916. 

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

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

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

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

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

  922. 

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

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

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

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

  927.         modify_pred(left_modifier_c, &pred_mode_uv );

  928.     }

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

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

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

  932.         modify_pred(top_modifier_c, &pred_mode_uv );

  933.     }

  934. 

  935.     /* get coded block pattern */

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

  937.         cbp_code = get_ue_golomb(gb);

  938.     if(cbp_code > 63){

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

  940.         return -1;

  941.     }

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

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

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

  945. 

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

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

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

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

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

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

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

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

  954.     }

  955. 

  956.     /* chroma intra prediction */

  957.     /* extend borders by one pixel */

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

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

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

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

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

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

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

  965.     } else {

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

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

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

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

  970.     }

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

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

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

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

  975. 

  976.     decode_residual_chroma(h);

  977.     filter_mb(h,I_8X8);

  978. 

  979.     /* mark motion vectors as intra */

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

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

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

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

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

  985.         *h->col_type = I_8X8;

  986. 

  987.     return 0;

  988. }

  989. 

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

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

  992.     int ref[4];

  993. 

  994.     init_mb(h);

  995.     switch(mb_type) {

  996.     case P_SKIP:

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

  998.         break;

  999.     case P_16X16:

  1000.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  1001.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN,   BLK_16X16,ref[0]);

  1002.         break;

  1003.     case P_16X8:

  1004.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  1005.         ref[2] = h->ref_flag ? 0 : get_bits1(gb);

  1006.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,      BLK_16X8, ref[0]);

  1007.         mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT,     BLK_16X8, ref[2]);

  1008.         break;

  1009.     case P_8X16:

  1010.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  1011.         ref[1] = h->ref_flag ? 0 : get_bits1(gb);

  1012.         mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT,     BLK_8X16, ref[0]);

  1013.         mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]);

  1014.         break;

  1015.     case P_8X8:

  1016.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  1017.         ref[1] = h->ref_flag ? 0 : get_bits1(gb);

  1018.         ref[2] = h->ref_flag ? 0 : get_bits1(gb);

  1019.         ref[3] = h->ref_flag ? 0 : get_bits1(gb);

  1020.         mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN,   BLK_8X8, ref[0]);

  1021.         mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN,   BLK_8X8, ref[1]);

  1022.         mv_pred(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN,   BLK_8X8, ref[2]);

  1023.         mv_pred(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN,   BLK_8X8, ref[3]);

  1024.     }

  1025.     inter_pred(h, mb_type);

  1026.     store_mvs(h);

  1027.     if(mb_type != P_SKIP)

  1028.         decode_residual_inter(h);

  1029.     filter_mb(h,mb_type);

  1030.     *h->col_type = mb_type;

  1031. }

  1032. 

  1033. static void decode_mb_b(AVSContext *h, enum mb_t mb_type) {

  1034.     int block;

  1035.     enum sub_mb_t sub_type[4];

  1036.     int flags;

  1037. 

  1038.     init_mb(h);

  1039. 

  1040.     /* reset all MVs */

  1041.     h->mv[MV_FWD_X0] = dir_mv;

  1042.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1043.     h->mv[MV_BWD_X0] = dir_mv;

  1044.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1045.     switch(mb_type) {

  1046.     case B_SKIP:

  1047.     case B_DIRECT:

  1048.         if(!(*h->col_type)) {

  1049.             /* intra MB at co-location, do in-plane prediction */

  1050.             mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);

  1051.             mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);

  1052.         } else

  1053.             /* direct prediction from co-located P MB, block-wise */

  1054.             for(block=0;block<4;block++)

  1055.                 mv_pred_direct(h,&h->mv[mv_scan[block]],

  1056.                             &h->col_mv[(h->mby*h->mb_width+h->mbx)*4 + block]);

  1057.         break;

  1058.     case B_FWD_16X16:

  1059.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);

  1060.         break;

  1061.     case B_SYM_16X16:

  1062.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);

  1063.         mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);

  1064.         break;

  1065.     case B_BWD_16X16:

  1066.         mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);

  1067.         break;

  1068.     case B_8X8:

  1069.         for(block=0;block<4;block++)

  1070.             sub_type[block] = get_bits(&h->s.gb,2);

  1071.         for(block=0;block<4;block++) {

  1072.             switch(sub_type[block]) {

  1073.             case B_SUB_DIRECT:

  1074.                 if(!(*h->col_type)) {

  1075.                     /* intra MB at co-location, do in-plane prediction */

  1076.                     mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1077.                             MV_PRED_BSKIP, BLK_8X8, 1);

  1078.                     mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1079.                             mv_scan[block]-3+MV_BWD_OFFS,

  1080.                             MV_PRED_BSKIP, BLK_8X8, 0);

  1081.                 } else

  1082.                     mv_pred_direct(h,&h->mv[mv_scan[block]],

  1083.                                    &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);

  1084.                 break;

  1085.             case B_SUB_FWD:

  1086.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1087.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1088.                 break;

  1089.             case B_SUB_SYM:

  1090.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1091.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1092.                 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);

  1093.                 break;

  1094.             }

  1095.         }

  1096.         for(block=0;block<4;block++) {

  1097.             if(sub_type[block] == B_SUB_BWD)

  1098.                 mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1099.                         mv_scan[block]+MV_BWD_OFFS-3,

  1100.                         MV_PRED_MEDIAN, BLK_8X8, 0);

  1101.         }

  1102.         break;

  1103.     default:

  1104.         assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));

  1105.         flags = b_partition_flags[(mb_type-1)>>1];

  1106.         if(mb_type & 1) { /* 16x8 macroblock types */

  1107.             if(flags & FWD0)

  1108.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1109.             if(flags & SYM0) {

  1110.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1111.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);

  1112.             }

  1113.             if(flags & FWD1)

  1114.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1115.             if(flags & SYM1) {

  1116.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1117.                 mv_pred_sym(h, &h->mv[9], BLK_16X8);

  1118.             }

  1119.             if(flags & BWD0)

  1120.                 mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP,  BLK_16X8, 0);

  1121.             if(flags & BWD1)

  1122.                 mv_pred(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);

  1123.         } else {          /* 8x16 macroblock types */

  1124.             if(flags & FWD0)

  1125.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1126.             if(flags & SYM0) {

  1127.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1128.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);

  1129.             }

  1130.             if(flags & FWD1)

  1131.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1132.             if(flags & SYM1) {

  1133.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1134.                 mv_pred_sym(h, &h->mv[6], BLK_8X16);

  1135.             }

  1136.             if(flags & BWD0)

  1137.                 mv_pred(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);

  1138.             if(flags & BWD1)

  1139.                 mv_pred(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 0);

  1140.         }

  1141.     }

  1142.     inter_pred(h, mb_type);

  1143.     if(mb_type != B_SKIP)

  1144.         decode_residual_inter(h);

  1145.     filter_mb(h,mb_type);

  1146. }

  1147. 

  1148. /*****************************************************************************

  1149.  *

  1150.  * slice level

  1151.  *

  1152.  ****************************************************************************/

  1153. 

  1154. static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {

  1155.     if(h->stc > 0xAF)

  1156.         av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);

  1157.     h->mby = h->stc;

  1158.     if((h->mby == 0) && (!h->qp_fixed)){

  1159.         h->qp_fixed = get_bits1(gb);

  1160.         h->qp = get_bits(gb,6);

  1161.     }

  1162.     /* inter frame or second slice can have weighting params */

  1163.     if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2))

  1164.         if(get_bits1(gb)) { //slice_weighting_flag

  1165.             av_log(h->s.avctx, AV_LOG_ERROR,

  1166.                    "weighted prediction not yet supported\n");

  1167.         }

  1168.     return 0;

  1169. }

  1170. 

  1171. static inline void check_for_slice(AVSContext *h) {

  1172.     GetBitContext *gb = &h->s.gb;

  1173.     int align;

  1174.     align = (-get_bits_count(gb)) & 7;

  1175.     if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {

  1176.         get_bits_long(gb,24+align);

  1177.         h->stc = get_bits(gb,8);

  1178.         decode_slice_header(h,gb);

  1179.     }

  1180. }

  1181. 

  1182. /*****************************************************************************

  1183.  *

  1184.  * frame level

  1185.  *

  1186.  ****************************************************************************/

  1187. 

  1188. static void init_pic(AVSContext *h) {

  1189.     int i;

  1190. 

  1191.     /* clear some predictors */

  1192.     for(i=0;i<=20;i+=4)

  1193.         h->mv[i] = un_mv;

  1194.     h->mv[MV_BWD_X0] = dir_mv;

  1195.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1196.     h->mv[MV_FWD_X0] = dir_mv;

  1197.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1198.     h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;

  1199.     h->cy = h->picture.data[0];

  1200.     h->cu = h->picture.data[1];

  1201.     h->cv = h->picture.data[2];

  1202.     h->l_stride = h->picture.linesize[0];

  1203.     h->c_stride = h->picture.linesize[1];

  1204.     h->luma_scan[2] = 8*h->l_stride;

  1205.     h->luma_scan[3] = 8*h->l_stride+8;

  1206.     h->mbx = h->mby = 0;

  1207.     h->flags = 0;

  1208. }

  1209. 

  1210. static int decode_pic(AVSContext *h) {

  1211.     MpegEncContext *s = &h->s;

  1212.     int skip_count;

  1213.     enum mb_t mb_type;

  1214. 

  1215.     if (!s->context_initialized) {

  1216.         if (MPV_common_init(s) < 0)

  1217.             return -1;

  1218.     }

  1219.     get_bits(&s->gb,16);//bbv_dwlay

  1220.     if(h->stc == PIC_PB_START_CODE) {

  1221.         h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE;

  1222.         /* make sure we have the reference frames we need */

  1223.         if(!h->DPB[0].data[0] ||

  1224.           (!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE))

  1225.             return -1;

  1226.     } else {

  1227.         h->pic_type = FF_I_TYPE;

  1228.         if(get_bits1(&s->gb))

  1229.             get_bits(&s->gb,16);//time_code

  1230.     }

  1231.     /* release last B frame */

  1232.     if(h->picture.data[0])

  1233.         s->avctx->release_buffer(s->avctx, (AVFrame *)&h->picture);

  1234. 

  1235.     s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture);

  1236.     init_pic(h);

  1237.     h->picture.poc = get_bits(&s->gb,8)*2;

  1238. 

  1239.     /* get temporal distances and MV scaling factors */

  1240.     if(h->pic_type != FF_B_TYPE) {

  1241.         h->dist[0] = (h->picture.poc - h->DPB[0].poc  + 512) % 512;

  1242.     } else {

  1243.         h->dist[0] = (h->DPB[0].poc  - h->picture.poc + 512) % 512;

  1244.     }

  1245.     h->dist[1] = (h->picture.poc - h->DPB[1].poc  + 512) % 512;

  1246.     h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;

  1247.     h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;

  1248.     if(h->pic_type == FF_B_TYPE) {

  1249.         h->sym_factor = h->dist[0]*h->scale_den[1];

  1250.     } else {

  1251.         h->direct_den[0] = h->dist[0] ? 16384/h->dist[0] : 0;

  1252.         h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0;

  1253.     }

  1254. 

  1255.     if(s->low_delay)

  1256.         get_ue_golomb(&s->gb); //bbv_check_times

  1257.     h->progressive             = get_bits1(&s->gb);

  1258.     if(h->progressive)

  1259.         h->pic_structure = 1;

  1260.     else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) )

  1261.         get_bits1(&s->gb);     //advanced_pred_mode_disable

  1262.     skip_bits1(&s->gb);        //top_field_first

  1263.     skip_bits1(&s->gb);        //repeat_first_field

  1264.     h->qp_fixed                = get_bits1(&s->gb);

  1265.     h->qp                      = get_bits(&s->gb,6);

  1266.     if(h->pic_type == FF_I_TYPE) {

  1267.         if(!h->progressive && !h->pic_structure)

  1268.             skip_bits1(&s->gb);//what is this?

  1269.         skip_bits(&s->gb,4);   //reserved bits

  1270.     } else {

  1271.         if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1))

  1272.             h->ref_flag        = get_bits1(&s->gb);

  1273.         skip_bits(&s->gb,4);   //reserved bits

  1274.         h->skip_mode_flag      = get_bits1(&s->gb);

  1275.     }

  1276.     h->loop_filter_disable     = get_bits1(&s->gb);

  1277.     if(!h->loop_filter_disable && get_bits1(&s->gb)) {

  1278.         h->alpha_offset        = get_se_golomb(&s->gb);

  1279.         h->beta_offset         = get_se_golomb(&s->gb);

  1280.     } else {

  1281.         h->alpha_offset = h->beta_offset  = 0;

  1282.     }

  1283.     check_for_slice(h);

  1284.     if(h->pic_type == FF_I_TYPE) {

  1285.         do {

  1286.             decode_mb_i(h, 0);

  1287.         } while(next_mb(h));

  1288.     } else if(h->pic_type == FF_P_TYPE) {

  1289.         do {

  1290.             if(h->skip_mode_flag) {

  1291.                 skip_count = get_ue_golomb(&s->gb);

  1292.                 while(skip_count--) {

  1293.                     decode_mb_p(h,P_SKIP);

  1294.                     if(!next_mb(h))

  1295.                         goto done;

  1296.                 }

  1297.                 mb_type = get_ue_golomb(&s->gb) + P_16X16;

  1298.             } else

  1299.                 mb_type = get_ue_golomb(&s->gb) + P_SKIP;

  1300.             if(mb_type > P_8X8) {

  1301.                 decode_mb_i(h, mb_type - P_8X8 - 1);

  1302.             } else

  1303.                 decode_mb_p(h,mb_type);

  1304.         } while(next_mb(h));

  1305.     } else { /* FF_B_TYPE */

  1306.         do {

  1307.             if(h->skip_mode_flag) {

  1308.                 skip_count = get_ue_golomb(&s->gb);

  1309.                 while(skip_count--) {

  1310.                     decode_mb_b(h,B_SKIP);

  1311.                     if(!next_mb(h))

  1312.                         goto done;

  1313.                 }

  1314.                 mb_type = get_ue_golomb(&s->gb) + B_DIRECT;

  1315.             } else

  1316.                 mb_type = get_ue_golomb(&s->gb) + B_SKIP;

  1317.             if(mb_type > B_8X8) {

  1318.                 decode_mb_i(h, mb_type - B_8X8 - 1);

  1319.             } else

  1320.                 decode_mb_b(h,mb_type);

  1321.         } while(next_mb(h));

  1322.     }

  1323.  done:

  1324.     if(h->pic_type != FF_B_TYPE) {

  1325.         if(h->DPB[1].data[0])

  1326.             s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]);

  1327.         memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture));

  1328.         memcpy(&h->DPB[0], &h->picture, sizeof(Picture));

  1329.         memset(&h->picture,0,sizeof(Picture));

  1330.     }

  1331.     return 0;

  1332. }

  1333. 

  1334. /*****************************************************************************

  1335.  *

  1336.  * headers and interface

  1337.  *

  1338.  ****************************************************************************/

  1339. 

  1340. /**

  1341.  * some predictions require data from the top-neighbouring macroblock.

  1342.  * this data has to be stored for one complete row of macroblocks

  1343.  * and this storage space is allocated here

  1344.  */

  1345. static void init_top_lines(AVSContext *h) {

  1346.     /* alloc top line of predictors */

  1347.     h->top_qp       = av_malloc( h->mb_width);

  1348.     h->top_mv[0]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1349.     h->top_mv[1]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1350.     h->top_pred_Y   = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));

  1351.     h->top_border_y = av_malloc((h->mb_width+1)*16);

  1352.     h->top_border_u = av_malloc((h->mb_width)*10);

  1353.     h->top_border_v = av_malloc((h->mb_width)*10);

  1354. 

  1355.     /* alloc space for co-located MVs and types */

  1356.     h->col_mv       = av_malloc( h->mb_width*h->mb_height*4*sizeof(vector_t));

  1357.     h->col_type_base = av_malloc(h->mb_width*h->mb_height);

  1358. }

  1359. 

  1360. static int decode_seq_header(AVSContext *h) {

  1361.     MpegEncContext *s = &h->s;

  1362.     extern const AVRational ff_frame_rate_tab[];

  1363.     int frame_rate_code;

  1364. 

  1365.     h->profile =         get_bits(&s->gb,8);

  1366.     h->level =           get_bits(&s->gb,8);

  1367.     skip_bits1(&s->gb); //progressive sequence

  1368.     s->width =           get_bits(&s->gb,14);

  1369.     s->height =          get_bits(&s->gb,14);

  1370.     skip_bits(&s->gb,2); //chroma format

  1371.     skip_bits(&s->gb,3); //sample_precision

  1372.     h->aspect_ratio =    get_bits(&s->gb,4);

  1373.     frame_rate_code =    get_bits(&s->gb,4);

  1374.     skip_bits(&s->gb,18);//bit_rate_lower

  1375.     skip_bits1(&s->gb);  //marker_bit

  1376.     skip_bits(&s->gb,12);//bit_rate_upper

  1377.     s->low_delay =       get_bits1(&s->gb);

  1378.     h->mb_width  = (s->width  + 15) >> 4;

  1379.     h->mb_height = (s->height + 15) >> 4;

  1380.     h->s.avctx->time_base.den = ff_frame_rate_tab[frame_rate_code].num;

  1381.     h->s.avctx->time_base.num = ff_frame_rate_tab[frame_rate_code].den;

  1382.     h->s.avctx->width  = s->width;

  1383.     h->s.avctx->height = s->height;

  1384.     if(!h->top_qp)

  1385.         init_top_lines(h);

  1386.     return 0;

  1387. }

  1388. 

  1389. /**

  1390.  * finds the end of the current frame in the bitstream.

  1391.  * @return the position of the first byte of the next frame, or -1

  1392.  */

  1393. int ff_cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) {

  1394.     int pic_found, i;

  1395.     uint32_t state;

  1396. 

  1397.     pic_found= pc->frame_start_found;

  1398.     state= pc->state;

  1399. 

  1400.     i=0;

  1401.     if(!pic_found){

  1402.         for(i=0; i<buf_size; i++){

  1403.             state= (state<<8) | buf[i];

  1404.             if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){

  1405.                 i++;

  1406.                 pic_found=1;

  1407.                 break;

  1408.             }

  1409.         }

  1410.     }

  1411. 

  1412.     if(pic_found){

  1413.         /* EOF considered as end of frame */

  1414.         if (buf_size == 0)

  1415.             return 0;

  1416.         for(; i<buf_size; i++){

  1417.             state= (state<<8) | buf[i];

  1418.             if((state&0xFFFFFF00) == 0x100){

  1419.                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){

  1420.                     pc->frame_start_found=0;

  1421.                     pc->state=-1;

  1422.                     return i-3;

  1423.                 }

  1424.             }

  1425.         }

  1426.     }

  1427.     pc->frame_start_found= pic_found;

  1428.     pc->state= state;

  1429.     return END_NOT_FOUND;

  1430. }

  1431. 

  1432. void ff_cavs_flush(AVCodecContext * avctx) {

  1433.     AVSContext *h = avctx->priv_data;

  1434.     h->got_keyframe = 0;

  1435. }

  1436. 

  1437. static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size,

  1438.                              uint8_t * buf, int buf_size) {

  1439.     AVSContext *h = avctx->priv_data;

  1440.     MpegEncContext *s = &h->s;

  1441.     int input_size;

  1442.     const uint8_t *buf_end;

  1443.     const uint8_t *buf_ptr;

  1444.     AVFrame *picture = data;

  1445.     uint32_t stc;

  1446. 

  1447.     s->avctx = avctx;

  1448. 

  1449.     if (buf_size == 0) {

  1450.         if(!s->low_delay && h->DPB[0].data[0]) {

  1451.             *data_size = sizeof(AVPicture);

  1452.             *picture = *(AVFrame *) &h->DPB[0];

  1453.         }

  1454.         return 0;

  1455.     }

  1456. 

  1457.     buf_ptr = buf;

  1458.     buf_end = buf + buf_size;

  1459.     for(;;) {

  1460.         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &stc);

  1461.         if(stc & 0xFFFFFE00)

  1462.             return FFMAX(0, buf_ptr - buf - s->parse_context.last_index);

  1463.         input_size = (buf_end - buf_ptr)*8;

  1464.         switch(stc) {

  1465.         case SEQ_START_CODE:

  1466.             init_get_bits(&s->gb, buf_ptr, input_size);

  1467.             decode_seq_header(h);

  1468.             break;

  1469.         case PIC_I_START_CODE:

  1470.             if(!h->got_keyframe) {

  1471.                 if(h->DPB[0].data[0])

  1472.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[0]);

  1473.                 if(h->DPB[1].data[0])

  1474.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[1]);

  1475.                 h->got_keyframe = 1;

  1476.             }

  1477.         case PIC_PB_START_CODE:

  1478.             *data_size = 0;

  1479.             if(!h->got_keyframe)

  1480.                 break;

  1481.             init_get_bits(&s->gb, buf_ptr, input_size);

  1482.             h->stc = stc;

  1483.             if(decode_pic(h))

  1484.                 break;

  1485.             *data_size = sizeof(AVPicture);

  1486.             if(h->pic_type != FF_B_TYPE) {

  1487.                 if(h->DPB[1].data[0]) {

  1488.                     *picture = *(AVFrame *) &h->DPB[1];

  1489.                 } else {

  1490.                     *data_size = 0;

  1491.                 }

  1492.             } else

  1493.                 *picture = *(AVFrame *) &h->picture;

  1494.             break;

  1495.         case EXT_START_CODE:

  1496.             //mpeg_decode_extension(avctx,buf_ptr, input_size);

  1497.             break;

  1498.         case USER_START_CODE:

  1499.             //mpeg_decode_user_data(avctx,buf_ptr, input_size);

  1500.             break;

  1501.         default:

  1502.             if (stc >= SLICE_MIN_START_CODE &&

  1503.                 stc <= SLICE_MAX_START_CODE) {

  1504.                 init_get_bits(&s->gb, buf_ptr, input_size);

  1505.                 decode_slice_header(h, &s->gb);

  1506.             }

  1507.             break;

  1508.         }

  1509.     }

  1510. }

  1511. 

  1512. static int cavs_decode_init(AVCodecContext * avctx) {

  1513.     AVSContext *h = avctx->priv_data;

  1514.     MpegEncContext * const s = &h->s;

  1515. 

  1516.     MPV_decode_defaults(s);

  1517.     s->avctx = avctx;

  1518. 

  1519.     avctx->pix_fmt= PIX_FMT_YUV420P;

  1520. 

  1521.     h->luma_scan[0] = 0;

  1522.     h->luma_scan[1] = 8;

  1523.     h->intra_pred_l[      INTRA_L_VERT] = intra_pred_vert;

  1524.     h->intra_pred_l[     INTRA_L_HORIZ] = intra_pred_horiz;

  1525.     h->intra_pred_l[        INTRA_L_LP] = intra_pred_lp;

  1526.     h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;

  1527.     h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;

  1528.     h->intra_pred_l[   INTRA_L_LP_LEFT] = intra_pred_lp_left;

  1529.     h->intra_pred_l[    INTRA_L_LP_TOP] = intra_pred_lp_top;

  1530.     h->intra_pred_l[    INTRA_L_DC_128] = intra_pred_dc_128;

  1531.     h->intra_pred_c[        INTRA_C_LP] = intra_pred_lp;

  1532.     h->intra_pred_c[     INTRA_C_HORIZ] = intra_pred_horiz;

  1533.     h->intra_pred_c[      INTRA_C_VERT] = intra_pred_vert;

  1534.     h->intra_pred_c[     INTRA_C_PLANE] = intra_pred_plane;

  1535.     h->intra_pred_c[   INTRA_C_LP_LEFT] = intra_pred_lp_left;

  1536.     h->intra_pred_c[    INTRA_C_LP_TOP] = intra_pred_lp_top;

  1537.     h->intra_pred_c[    INTRA_C_DC_128] = intra_pred_dc_128;

  1538.     h->mv[ 7] = un_mv;

  1539.     h->mv[19] = un_mv;

  1540.     return 0;

  1541. }

  1542. 

  1543. static int cavs_decode_end(AVCodecContext * avctx) {

  1544.     AVSContext *h = avctx->priv_data;

  1545. 

  1546.     av_free(h->top_qp);

  1547.     av_free(h->top_mv[0]);

  1548.     av_free(h->top_mv[1]);

  1549.     av_free(h->top_pred_Y);

  1550.     av_free(h->top_border_y);

  1551.     av_free(h->top_border_u);

  1552.     av_free(h->top_border_v);

  1553.     av_free(h->col_mv);

  1554.     av_free(h->col_type_base);

  1555.     return 0;

  1556. }

  1557. 

  1558. AVCodec cavs_decoder = {

  1559.     "cavs",

  1560.     CODEC_TYPE_VIDEO,

  1561.     CODEC_ID_CAVS,

  1562.     sizeof(AVSContext),

  1563.     cavs_decode_init,

  1564.     NULL,

  1565.     cavs_decode_end,

  1566.     cavs_decode_frame,

  1567.     CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1568.     .flush= ff_cavs_flush,

  1569. };