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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_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 = *((uint64_t *)(&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) {

  489.     /* always do 8x8 blocks TODO: are larger blocks worth it? */

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  513. }

  514. 

  515. /*****************************************************************************

  516.  *

  517.  * motion vector prediction

  518.  *

  519.  ****************************************************************************/

  520. 

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

  522.     switch(size) {

  523.     case BLK_16X16:

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

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

  526.     case BLK_16X8:

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

  528.         break;

  529.     case BLK_8X16:

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

  531.         break;

  532.     }

  533. }

  534. 

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

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

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

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

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

  540. }

  541. 

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

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

  544. 

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

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

  547. }

  548. 

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

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

  551.     int len_ab, len_bc, len_ca, len_mid;

  552. 

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

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

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

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

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

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

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

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

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

  562.     if(len_mid == len_ab) {

  563.         mvP->x = cx;

  564.         mvP->y = cy;

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

  566.         mvP->x = ax;

  567.         mvP->y = ay;

  568.     } else {

  569.         mvP->x = bx;

  570.         mvP->y = by;

  571.     }

  572. }

  573. 

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

  575.                                   vector_t *col_mv) {

  576.     vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS;

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

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

  579. 

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

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

  582.     pmv_fw->ref = 1;

  583.     pmv_bw->ref = 0;

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

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

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

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

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

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

  590. }

  591. 

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

  593.     vector_t *dst = src + MV_BWD_OFFS;

  594. 

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

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

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

  598.     dst->ref = 0;

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

  600.     set_mvs(dst, size);

  601. }

  602. 

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

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

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

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

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

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

  609.     int mvAref = mvA->ref;

  610.     int mvBref = mvB->ref;

  611.     int mvCref;

  612. 

  613.     mvP->ref = ref;

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

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

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

  617.     mvCref = mvC->ref;

  618.     if(mode == MV_PRED_PSKIP) {

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

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

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

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

  623.             set_mvs(mvP,size);

  624.             return;

  625.         }

  626.     }

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

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

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

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

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

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

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

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

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

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

  637.     } else {

  638.         switch(mode) {

  639.         case MV_PRED_LEFT:

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

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

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

  643.             } else

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

  645.             break;

  646.         case MV_PRED_TOP:

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

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

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

  650.             } else

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

  652.             break;

  653.         case MV_PRED_TOPRIGHT:

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

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

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

  657.             } else

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

  659.             break;

  660.         default:

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

  662.             break;

  663.         }

  664.     }

  665.     if(mode < MV_PRED_PSKIP) {

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

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

  668.     }

  669.     set_mvs(mvP,size);

  670. }

  671. 

  672. /*****************************************************************************

  673.  *

  674.  * residual data decoding

  675.  *

  676.  ****************************************************************************/

  677. 

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

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

  680.     if(order) {

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

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

  683.     }

  684.     return get_ue_golomb(gb);

  685. }

  686. 

  687. /**

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

  689.  *  and add them to sample block

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

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

  692.  * @param qp quantizer

  693.  * @param dst location of sample block

  694.  * @param stride line stride in frame buffer

  695.  */

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

  697.                                  const residual_vlc_t *r, int esc_golomb_order,

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

  699.     int i,pos = -1;

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

  701.     int level_buf[64];

  702.     int run_buf[64];

  703.     int dqm = dequant_mul[qp];

  704.     int dqs = dequant_shift[qp];

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

  706.     const uint8_t *scantab = ff_zigzag_direct;

  707.     DCTELEM block[64];

  708. 

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

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

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

  712.         if(level_code >= ESCAPE_CODE) {

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

  714.             esc_code = get_ue_code(gb,esc_golomb_order);

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

  716.             while(level > r->inc_limit)

  717.                 r++;

  718.             mask = -(level_code & 1);

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

  720.         } else {

  721.             if(level_code < 0)

  722.                 return -1;

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

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

  725.                 break;

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

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

  728.         }

  729.         level_buf[i] = level;

  730.         run_buf[i] = run;

  731.     }

  732.     /* inverse scan and dequantization */

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

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

  735.         if(pos > 63) {

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

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

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

  739.             return -1;

  740.         }

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

  742.     }

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

  744.     return 0;

  745. }

  746. 

  747. 

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

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

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

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

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

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

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

  755. }

  756. 

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

  758.     int block;

  759. 

  760.     /* get coded block pattern */

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

  762.     if(cbp > 63){

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

  764.         return -1;

  765.     }

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

  767. 

  768.     /* get quantizer */

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

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

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

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

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

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

  775.     decode_residual_chroma(h);

  776. 

  777.     return 0;

  778. }

  779. 

  780. /*****************************************************************************

  781.  *

  782.  * macroblock level

  783.  *

  784.  ****************************************************************************/

  785. 

  786. /**

  787.  * initialise predictors for motion vectors and intra prediction

  788.  */

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

  790.     int i;

  791. 

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

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

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

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

  796.     }

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

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

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

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

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

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

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

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

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

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

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

  808.         h->flags |= D_AVAIL;

  809.     }

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

  811.         h->flags &= ~C_AVAIL;

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

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

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

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

  816.     }

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

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

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

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

  821.     }

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

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

  824. }

  825. 

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

  827. 

  828. /**

  829.  * save predictors for later macroblocks and increase

  830.  * macroblock address

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

  832.  */

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

  834.     int i;

  835. 

  836.     h->flags |= A_AVAIL;

  837.     h->cy += 16;

  838.     h->cu += 8;

  839.     h->cv += 8;

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

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

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

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

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

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

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

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

  848.     /* next MB address */

  849.     h->mbx++;

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

  851.         h->flags = B_AVAIL|C_AVAIL;

  852.         /* clear left pred_modes */

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

  854.         /* clear left mv predictors */

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

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

  857.         h->mbx = 0;

  858.         h->mby++;

  859.         /* re-calculate sample pointers */

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

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

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

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

  864.             return 0;

  865.         } else {

  866.             //check_for_slice(h);

  867.         }

  868.     }

  869.     return 1;

  870. }

  871. 

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

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

  874.     int block, pred_mode_uv;

  875.     uint8_t top[18];

  876.     uint8_t left[18];

  877.     uint8_t *d;

  878. 

  879.     init_mb(h);

  880. 

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

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

  883.         int nA,nB,predpred;

  884.         int pos = scan3x3[block];

  885. 

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

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

  888.         predpred = FFMIN(nA,nB);

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

  890.             predpred = INTRA_L_LP;

  891.         if(!get_bits1(gb)){

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

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

  894.         }

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

  896.     }

  897.     pred_mode_uv = get_ue_golomb(gb);

  898.     if(pred_mode_uv > 6) {

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

  900.         return -1;

  901.     }

  902. 

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

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

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

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

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

  908. 

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

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

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

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

  913.         modify_pred(left_modifier_c, &pred_mode_uv );

  914.     }

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

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

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

  918.         modify_pred(top_modifier_c, &pred_mode_uv );

  919.     }

  920. 

  921.     /* get coded block pattern */

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

  923.         cbp_code = get_ue_golomb(gb);

  924.     if(cbp_code > 63){

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

  926.         return -1;

  927.     }

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

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

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

  931. 

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

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

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

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

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

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

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

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

  940.     }

  941. 

  942.     /* chroma intra prediction */

  943.     /* extend borders by one pixel */

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

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

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

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

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

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

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

  951.     } else {

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

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

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

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

  956.     }

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

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

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

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

  961. 

  962.     decode_residual_chroma(h);

  963.     filter_mb(h,I_8X8);

  964. 

  965.     /* mark motion vectors as intra */

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

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

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

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

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

  971.         *h->col_type = I_8X8;

  972. 

  973.     return 0;

  974. }

  975. 

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

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

  978.     int ref[4];

  979. 

  980.     init_mb(h);

  981.     switch(mb_type) {

  982.     case P_SKIP:

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

  984.         break;

  985.     case P_16X16:

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

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

  988.         break;

  989.     case P_16X8:

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

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

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

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

  994.         break;

  995.     case P_8X16:

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

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

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

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

  1000.         break;

  1001.     case P_8X8:

  1002.         ref[0] = h->ref_flag ? 0 : get_bits1(gb);

  1003.         ref[1] = h->ref_flag ? 0 : get_bits1(gb);

  1004.         ref[2] = h->ref_flag ? 0 : get_bits1(gb);

  1005.         ref[3] = h->ref_flag ? 0 : get_bits1(gb);

  1006.         mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN,   BLK_8X8, ref[0]);

  1007.         mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN,   BLK_8X8, ref[1]);

  1008.         mv_pred(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN,   BLK_8X8, ref[2]);

  1009.         mv_pred(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN,   BLK_8X8, ref[3]);

  1010.     }

  1011.     inter_pred(h);

  1012.     store_mvs(h);

  1013.     if(mb_type != P_SKIP)

  1014.         decode_residual_inter(h);

  1015.     filter_mb(h,mb_type);

  1016.     *h->col_type = mb_type;

  1017. }

  1018. 

  1019. static void decode_mb_b(AVSContext *h, enum mb_t mb_type) {

  1020.     int block;

  1021.     enum sub_mb_t sub_type[4];

  1022.     int flags;

  1023. 

  1024.     init_mb(h);

  1025. 

  1026.     /* reset all MVs */

  1027.     h->mv[MV_FWD_X0] = dir_mv;

  1028.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1029.     h->mv[MV_BWD_X0] = dir_mv;

  1030.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1031.     switch(mb_type) {

  1032.     case B_SKIP:

  1033.     case B_DIRECT:

  1034.         if(!(*h->col_type)) {

  1035.             /* intra MB at co-location, do in-plane prediction */

  1036.             mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);

  1037.             mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);

  1038.         } else

  1039.             /* direct prediction from co-located P MB, block-wise */

  1040.             for(block=0;block<4;block++)

  1041.                 mv_pred_direct(h,&h->mv[mv_scan[block]],

  1042.                             &h->col_mv[(h->mby*h->mb_width+h->mbx)*4 + block]);

  1043.         break;

  1044.     case B_FWD_16X16:

  1045.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);

  1046.         break;

  1047.     case B_SYM_16X16:

  1048.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);

  1049.         mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);

  1050.         break;

  1051.     case B_BWD_16X16:

  1052.         mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);

  1053.         break;

  1054.     case B_8X8:

  1055.         for(block=0;block<4;block++)

  1056.             sub_type[block] = get_bits(&h->s.gb,2);

  1057.         for(block=0;block<4;block++) {

  1058.             switch(sub_type[block]) {

  1059.             case B_SUB_DIRECT:

  1060.                 if(!(*h->col_type)) {

  1061.                     /* intra MB at co-location, do in-plane prediction */

  1062.                     mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1063.                             MV_PRED_BSKIP, BLK_8X8, 1);

  1064.                     mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1065.                             mv_scan[block]-3+MV_BWD_OFFS,

  1066.                             MV_PRED_BSKIP, BLK_8X8, 0);

  1067.                 } else

  1068.                     mv_pred_direct(h,&h->mv[mv_scan[block]],

  1069.                                    &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);

  1070.                 break;

  1071.             case B_SUB_FWD:

  1072.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1073.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1074.                 break;

  1075.             case B_SUB_SYM:

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

  1077.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1078.                 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);

  1079.                 break;

  1080.             }

  1081.         }

  1082.         for(block=0;block<4;block++) {

  1083.             if(sub_type[block] == B_SUB_BWD)

  1084.                 mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1085.                         mv_scan[block]+MV_BWD_OFFS-3,

  1086.                         MV_PRED_MEDIAN, BLK_8X8, 0);

  1087.         }

  1088.         break;

  1089.     default:

  1090.         assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));

  1091.         flags = b_partition_flags[(mb_type-1)>>1];

  1092.         if(mb_type & 1) { /* 16x8 macroblock types */

  1093.             if(flags & FWD0)

  1094.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1095.             if(flags & SYM0) {

  1096.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1097.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);

  1098.             }

  1099.             if(flags & FWD1)

  1100.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1101.             if(flags & SYM1) {

  1102.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1103.                 mv_pred_sym(h, &h->mv[9], BLK_16X8);

  1104.             }

  1105.             if(flags & BWD0)

  1106.                 mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP,  BLK_16X8, 0);

  1107.             if(flags & BWD1)

  1108.                 mv_pred(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);

  1109.         } else {          /* 8x16 macroblock types */

  1110.             if(flags & FWD0)

  1111.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1112.             if(flags & SYM0) {

  1113.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1114.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);

  1115.             }

  1116.             if(flags & FWD1)

  1117.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1118.             if(flags & SYM1) {

  1119.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1120.                 mv_pred_sym(h, &h->mv[6], BLK_8X16);

  1121.             }

  1122.             if(flags & BWD0)

  1123.                 mv_pred(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);

  1124.             if(flags & BWD1)

  1125.                 mv_pred(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 0);

  1126.         }

  1127.     }

  1128.     inter_pred(h);

  1129.     if(mb_type != B_SKIP)

  1130.         decode_residual_inter(h);

  1131.     filter_mb(h,mb_type);

  1132. }

  1133. 

  1134. /*****************************************************************************

  1135.  *

  1136.  * slice level

  1137.  *

  1138.  ****************************************************************************/

  1139. 

  1140. static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {

  1141.     if(h->stc > 0xAF)

  1142.         av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);

  1143.     h->mby = h->stc;

  1144.     if((h->mby == 0) && (!h->qp_fixed)){

  1145.         h->qp_fixed = get_bits1(gb);

  1146.         h->qp = get_bits(gb,6);

  1147.     }

  1148.     /* inter frame or second slice can have weighting params */

  1149.     if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2))

  1150.         if(get_bits1(gb)) { //slice_weighting_flag

  1151.             av_log(h->s.avctx, AV_LOG_ERROR,

  1152.                    "weighted prediction not yet supported\n");

  1153.         }

  1154.     return 0;

  1155. }

  1156. 

  1157. static inline void check_for_slice(AVSContext *h) {

  1158.     GetBitContext *gb = &h->s.gb;

  1159.     int align;

  1160.     align = (-get_bits_count(gb)) & 7;

  1161.     if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {

  1162.         get_bits_long(gb,24+align);

  1163.         h->stc = get_bits(gb,8);

  1164.         decode_slice_header(h,gb);

  1165.     }

  1166. }

  1167. 

  1168. /*****************************************************************************

  1169.  *

  1170.  * frame level

  1171.  *

  1172.  ****************************************************************************/

  1173. 

  1174. static void init_pic(AVSContext *h) {

  1175.     int i;

  1176. 

  1177.     /* clear some predictors */

  1178.     for(i=0;i<=20;i+=4)

  1179.         h->mv[i] = un_mv;

  1180.     h->mv[MV_BWD_X0] = dir_mv;

  1181.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1182.     h->mv[MV_FWD_X0] = dir_mv;

  1183.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1184.     h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;

  1185.     h->cy = h->picture.data[0];

  1186.     h->cu = h->picture.data[1];

  1187.     h->cv = h->picture.data[2];

  1188.     h->l_stride = h->picture.linesize[0];

  1189.     h->c_stride = h->picture.linesize[1];

  1190.     h->luma_scan[2] = 8*h->l_stride;

  1191.     h->luma_scan[3] = 8*h->l_stride+8;

  1192.     h->mbx = h->mby = 0;

  1193.     h->flags = 0;

  1194. }

  1195. 

  1196. static int decode_pic(AVSContext *h) {

  1197.     MpegEncContext *s = &h->s;

  1198.     int skip_count;

  1199.     enum mb_t mb_type;

  1200. 

  1201.     if (!s->context_initialized) {

  1202.         if (MPV_common_init(s) < 0)

  1203.             return -1;

  1204.     }

  1205.     get_bits(&s->gb,16);//bbv_dwlay

  1206.     if(h->stc == PIC_PB_START_CODE) {

  1207.         h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE;

  1208.         /* make sure we have the reference frames we need */

  1209.         if(!h->DPB[0].data[0] ||

  1210.           (!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE))

  1211.             return -1;

  1212.     } else {

  1213.         h->pic_type = FF_I_TYPE;

  1214.         if(get_bits1(&s->gb))

  1215.             get_bits(&s->gb,16);//time_code

  1216.     }

  1217.     /* release last B frame */

  1218.     if(h->picture.data[0])

  1219.         s->avctx->release_buffer(s->avctx, (AVFrame *)&h->picture);

  1220. 

  1221.     s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture);

  1222.     init_pic(h);

  1223.     h->picture.poc = get_bits(&s->gb,8)*2;

  1224. 

  1225.     /* get temporal distances and MV scaling factors */

  1226.     if(h->pic_type != FF_B_TYPE) {

  1227.         h->dist[0] = (h->picture.poc - h->DPB[0].poc  + 512) % 512;

  1228.     } else {

  1229.         h->dist[0] = (h->DPB[0].poc  - h->picture.poc + 512) % 512;

  1230.     }

  1231.     h->dist[1] = (h->picture.poc - h->DPB[1].poc  + 512) % 512;

  1232.     h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;

  1233.     h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;

  1234.     if(h->pic_type == FF_B_TYPE) {

  1235.         h->sym_factor = h->dist[0]*h->scale_den[1];

  1236.     } else {

  1237.         h->direct_den[0] = h->dist[0] ? 16384/h->dist[0] : 0;

  1238.         h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0;

  1239.     }

  1240. 

  1241.     if(s->low_delay)

  1242.         get_ue_golomb(&s->gb); //bbv_check_times

  1243.     h->progressive             = get_bits1(&s->gb);

  1244.     if(h->progressive)

  1245.         h->pic_structure = 1;

  1246.     else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) )

  1247.         get_bits1(&s->gb);     //advanced_pred_mode_disable

  1248.     skip_bits1(&s->gb);        //top_field_first

  1249.     skip_bits1(&s->gb);        //repeat_first_field

  1250.     h->qp_fixed                = get_bits1(&s->gb);

  1251.     h->qp                      = get_bits(&s->gb,6);

  1252.     if(h->pic_type == FF_I_TYPE) {

  1253.         if(!h->progressive && !h->pic_structure)

  1254.             skip_bits1(&s->gb);//what is this?

  1255.         skip_bits(&s->gb,4);   //reserved bits

  1256.     } else {

  1257.         if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1))

  1258.             h->ref_flag        = get_bits1(&s->gb);

  1259.         skip_bits(&s->gb,4);   //reserved bits

  1260.         h->skip_mode_flag      = get_bits1(&s->gb);

  1261.     }

  1262.     h->loop_filter_disable     = get_bits1(&s->gb);

  1263.     if(!h->loop_filter_disable && get_bits1(&s->gb)) {

  1264.         h->alpha_offset        = get_se_golomb(&s->gb);

  1265.         h->beta_offset         = get_se_golomb(&s->gb);

  1266.     } else {

  1267.         h->alpha_offset = h->beta_offset  = 0;

  1268.     }

  1269.     check_for_slice(h);

  1270.     if(h->pic_type == FF_I_TYPE) {

  1271.         do {

  1272.             decode_mb_i(h, 0);

  1273.         } while(next_mb(h));

  1274.     } else if(h->pic_type == FF_P_TYPE) {

  1275.         do {

  1276.             if(h->skip_mode_flag) {

  1277.                 skip_count = get_ue_golomb(&s->gb);

  1278.                 while(skip_count--) {

  1279.                     decode_mb_p(h,P_SKIP);

  1280.                     if(!next_mb(h))

  1281.                         goto done;

  1282.                 }

  1283.                 mb_type = get_ue_golomb(&s->gb) + P_16X16;

  1284.             } else

  1285.                 mb_type = get_ue_golomb(&s->gb) + P_SKIP;

  1286.             if(mb_type > P_8X8) {

  1287.                 decode_mb_i(h, mb_type - P_8X8 - 1);

  1288.             } else

  1289.                 decode_mb_p(h,mb_type);

  1290.         } while(next_mb(h));

  1291.     } else { /* FF_B_TYPE */

  1292.         do {

  1293.             if(h->skip_mode_flag) {

  1294.                 skip_count = get_ue_golomb(&s->gb);

  1295.                 while(skip_count--) {

  1296.                     decode_mb_b(h,B_SKIP);

  1297.                     if(!next_mb(h))

  1298.                         goto done;

  1299.                 }

  1300.                 mb_type = get_ue_golomb(&s->gb) + B_DIRECT;

  1301.             } else

  1302.                 mb_type = get_ue_golomb(&s->gb) + B_SKIP;

  1303.             if(mb_type > B_8X8) {

  1304.                 decode_mb_i(h, mb_type - B_8X8 - 1);

  1305.             } else

  1306.                 decode_mb_b(h,mb_type);

  1307.         } while(next_mb(h));

  1308.     }

  1309.  done:

  1310.     if(h->pic_type != FF_B_TYPE) {

  1311.         if(h->DPB[1].data[0])

  1312.             s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]);

  1313.         memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture));

  1314.         memcpy(&h->DPB[0], &h->picture, sizeof(Picture));

  1315.         memset(&h->picture,0,sizeof(Picture));

  1316.     }

  1317.     return 0;

  1318. }

  1319. 

  1320. /*****************************************************************************

  1321.  *

  1322.  * headers and interface

  1323.  *

  1324.  ****************************************************************************/

  1325. 

  1326. /**

  1327.  * some predictions require data from the top-neighbouring macroblock.

  1328.  * this data has to be stored for one complete row of macroblocks

  1329.  * and this storage space is allocated here

  1330.  */

  1331. static void init_top_lines(AVSContext *h) {

  1332.     /* alloc top line of predictors */

  1333.     h->top_qp       = av_malloc( h->mb_width);

  1334.     h->top_mv[0]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1335.     h->top_mv[1]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1336.     h->top_pred_Y   = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));

  1337.     h->top_border_y = av_malloc((h->mb_width+1)*16);

  1338.     h->top_border_u = av_malloc((h->mb_width)*10);

  1339.     h->top_border_v = av_malloc((h->mb_width)*10);

  1340. 

  1341.     /* alloc space for co-located MVs and types */

  1342.     h->col_mv       = av_malloc( h->mb_width*h->mb_height*4*sizeof(vector_t));

  1343.     h->col_type_base = av_malloc(h->mb_width*h->mb_height);

  1344. }

  1345. 

  1346. static int decode_seq_header(AVSContext *h) {

  1347.     MpegEncContext *s = &h->s;

  1348.     extern const AVRational ff_frame_rate_tab[];

  1349.     int frame_rate_code;

  1350. 

  1351.     h->profile =         get_bits(&s->gb,8);

  1352.     h->level =           get_bits(&s->gb,8);

  1353.     skip_bits1(&s->gb); //progressive sequence

  1354.     s->width =           get_bits(&s->gb,14);

  1355.     s->height =          get_bits(&s->gb,14);

  1356.     skip_bits(&s->gb,2); //chroma format

  1357.     skip_bits(&s->gb,3); //sample_precision

  1358.     h->aspect_ratio =    get_bits(&s->gb,4);

  1359.     frame_rate_code =    get_bits(&s->gb,4);

  1360.     skip_bits(&s->gb,18);//bit_rate_lower

  1361.     skip_bits1(&s->gb);  //marker_bit

  1362.     skip_bits(&s->gb,12);//bit_rate_upper

  1363.     s->low_delay =       get_bits1(&s->gb);

  1364.     h->mb_width  = (s->width  + 15) >> 4;

  1365.     h->mb_height = (s->height + 15) >> 4;

  1366.     h->s.avctx->time_base.den = ff_frame_rate_tab[frame_rate_code].num;

  1367.     h->s.avctx->time_base.num = ff_frame_rate_tab[frame_rate_code].den;

  1368.     h->s.avctx->width  = s->width;

  1369.     h->s.avctx->height = s->height;

  1370.     if(!h->top_qp)

  1371.         init_top_lines(h);

  1372.     return 0;

  1373. }

  1374. 

  1375. /**

  1376.  * finds the end of the current frame in the bitstream.

  1377.  * @return the position of the first byte of the next frame, or -1

  1378.  */

  1379. int ff_cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) {

  1380.     int pic_found, i;

  1381.     uint32_t state;

  1382. 

  1383.     pic_found= pc->frame_start_found;

  1384.     state= pc->state;

  1385. 

  1386.     i=0;

  1387.     if(!pic_found){

  1388.         for(i=0; i<buf_size; i++){

  1389.             state= (state<<8) | buf[i];

  1390.             if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){

  1391.                 i++;

  1392.                 pic_found=1;

  1393.                 break;

  1394.             }

  1395.         }

  1396.     }

  1397. 

  1398.     if(pic_found){

  1399.         /* EOF considered as end of frame */

  1400.         if (buf_size == 0)

  1401.             return 0;

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

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

  1404.             if((state&0xFFFFFF00) == 0x100){

  1405.                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){

  1406.                     pc->frame_start_found=0;

  1407.                     pc->state=-1;

  1408.                     return i-3;

  1409.                 }

  1410.             }

  1411.         }

  1412.     }

  1413.     pc->frame_start_found= pic_found;

  1414.     pc->state= state;

  1415.     return END_NOT_FOUND;

  1416. }

  1417. 

  1418. void ff_cavs_flush(AVCodecContext * avctx) {

  1419.     AVSContext *h = avctx->priv_data;

  1420.     h->got_keyframe = 0;

  1421. }

  1422. 

  1423. static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size,

  1424.                              uint8_t * buf, int buf_size) {

  1425.     AVSContext *h = avctx->priv_data;

  1426.     MpegEncContext *s = &h->s;

  1427.     int input_size;

  1428.     const uint8_t *buf_end;

  1429.     const uint8_t *buf_ptr;

  1430.     AVFrame *picture = data;

  1431.     uint32_t stc;

  1432. 

  1433.     s->avctx = avctx;

  1434. 

  1435.     if (buf_size == 0) {

  1436.         if(!s->low_delay && h->DPB[0].data[0]) {

  1437.             *data_size = sizeof(AVPicture);

  1438.             *picture = *(AVFrame *) &h->DPB[0];

  1439.         }

  1440.         return 0;

  1441.     }

  1442. 

  1443.     buf_ptr = buf;

  1444.     buf_end = buf + buf_size;

  1445.     for(;;) {

  1446.         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &stc);

  1447.         if(stc & 0xFFFFFE00)

  1448.             return FFMAX(0, buf_ptr - buf - s->parse_context.last_index);

  1449.         input_size = (buf_end - buf_ptr)*8;

  1450.         switch(stc) {

  1451.         case SEQ_START_CODE:

  1452.             init_get_bits(&s->gb, buf_ptr, input_size);

  1453.             decode_seq_header(h);

  1454.             break;

  1455.         case PIC_I_START_CODE:

  1456.             if(!h->got_keyframe) {

  1457.                 if(h->DPB[0].data[0])

  1458.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[0]);

  1459.                 if(h->DPB[1].data[0])

  1460.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[1]);

  1461.                 h->got_keyframe = 1;

  1462.             }

  1463.         case PIC_PB_START_CODE:

  1464.             *data_size = 0;

  1465.             if(!h->got_keyframe)

  1466.                 break;

  1467.             init_get_bits(&s->gb, buf_ptr, input_size);

  1468.             h->stc = stc;

  1469.             if(decode_pic(h))

  1470.                 break;

  1471.             *data_size = sizeof(AVPicture);

  1472.             if(h->pic_type != FF_B_TYPE) {

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

  1474.                     *picture = *(AVFrame *) &h->DPB[1];

  1475.                 } else {

  1476.                     *data_size = 0;

  1477.                 }

  1478.             } else

  1479.                 *picture = *(AVFrame *) &h->picture;

  1480.             break;

  1481.         case EXT_START_CODE:

  1482.             //mpeg_decode_extension(avctx,buf_ptr, input_size);

  1483.             break;

  1484.         case USER_START_CODE:

  1485.             //mpeg_decode_user_data(avctx,buf_ptr, input_size);

  1486.             break;

  1487.         default:

  1488.             if (stc >= SLICE_MIN_START_CODE &&

  1489.                 stc <= SLICE_MAX_START_CODE) {

  1490.                 init_get_bits(&s->gb, buf_ptr, input_size);

  1491.                 decode_slice_header(h, &s->gb);

  1492.             }

  1493.             break;

  1494.         }

  1495.     }

  1496. }

  1497. 

  1498. static int cavs_decode_init(AVCodecContext * avctx) {

  1499.     AVSContext *h = avctx->priv_data;

  1500.     MpegEncContext * const s = &h->s;

  1501. 

  1502.     MPV_decode_defaults(s);

  1503.     s->avctx = avctx;

  1504. 

  1505.     avctx->pix_fmt= PIX_FMT_YUV420P;

  1506. 

  1507.     h->luma_scan[0] = 0;

  1508.     h->luma_scan[1] = 8;

  1509.     h->intra_pred_l[      INTRA_L_VERT] = intra_pred_vert;

  1510.     h->intra_pred_l[     INTRA_L_HORIZ] = intra_pred_horiz;

  1511.     h->intra_pred_l[        INTRA_L_LP] = intra_pred_lp;

  1512.     h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;

  1513.     h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;

  1514.     h->intra_pred_l[   INTRA_L_LP_LEFT] = intra_pred_lp_left;

  1515.     h->intra_pred_l[    INTRA_L_LP_TOP] = intra_pred_lp_top;

  1516.     h->intra_pred_l[    INTRA_L_DC_128] = intra_pred_dc_128;

  1517.     h->intra_pred_c[        INTRA_C_LP] = intra_pred_lp;

  1518.     h->intra_pred_c[     INTRA_C_HORIZ] = intra_pred_horiz;

  1519.     h->intra_pred_c[      INTRA_C_VERT] = intra_pred_vert;

  1520.     h->intra_pred_c[     INTRA_C_PLANE] = intra_pred_plane;

  1521.     h->intra_pred_c[   INTRA_C_LP_LEFT] = intra_pred_lp_left;

  1522.     h->intra_pred_c[    INTRA_C_LP_TOP] = intra_pred_lp_top;

  1523.     h->intra_pred_c[    INTRA_C_DC_128] = intra_pred_dc_128;

  1524.     h->mv[ 7] = un_mv;

  1525.     h->mv[19] = un_mv;

  1526.     return 0;

  1527. }

  1528. 

  1529. static int cavs_decode_end(AVCodecContext * avctx) {

  1530.     AVSContext *h = avctx->priv_data;

  1531. 

  1532.     av_free(h->top_qp);

  1533.     av_free(h->top_mv[0]);

  1534.     av_free(h->top_mv[1]);

  1535.     av_free(h->top_pred_Y);

  1536.     av_free(h->top_border_y);

  1537.     av_free(h->top_border_u);

  1538.     av_free(h->top_border_v);

  1539.     av_free(h->col_mv);

  1540.     av_free(h->col_type_base);

  1541.     return 0;

  1542. }

  1543. 

  1544. AVCodec cavs_decoder = {

  1545.     "cavs",

  1546.     CODEC_TYPE_VIDEO,

  1547.     CODEC_ID_CAVS,

  1548.     sizeof(AVSContext),

  1549.     cavs_decode_init,

  1550.     NULL,

  1551.     cavs_decode_end,

  1552.     cavs_decode_frame,

  1553.     CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1554.     .flush= ff_cavs_flush,

  1555. };