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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.     int newmode = mod_table[*mode];

  389.     if(newmode < 0) {

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

  391.         *mode = 0;

  392.     } else {

  393.         *mode = newmode;

  394.     }

  395. }

  396. 

  397. /*****************************************************************************

  398.  *

  399.  * motion compensation

  400.  *

  401.  ****************************************************************************/

  402. 

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

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

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

  406.                         int src_y_offset,qpel_mc_func *qpix_op,

  407.                         h264_chroma_mc_func chroma_op,vector_t *mv){

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

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

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

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

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

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

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

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

  416.     int extra_height= extra_width;

  417.     int emu=0;

  418.     const int full_mx= mx>>2;

  419.     const int full_my= my>>2;

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

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

  422. 

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

  424.         return;

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

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

  427. 

  428.     if(   full_mx < 0-extra_width

  429.           || full_my < 0-extra_height

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

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

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

  433.                             16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);

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

  435.         emu=1;

  436.     }

  437. 

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

  439.     if(!square){

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

  441.     }

  442. 

  443.     if(emu){

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

  445.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  446.         src_cb= s->edge_emu_buffer;

  447.     }

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

  449. 

  450.     if(emu){

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

  452.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  453.         src_cr= s->edge_emu_buffer;

  454.     }

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

  456. }

  457. 

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

  459.                         uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,

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

  461.                         h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,

  462.                         h264_chroma_mc_func chroma_avg, vector_t *mv){

  463.     qpel_mc_func *qpix_op=  qpix_put;

  464.     h264_chroma_mc_func chroma_op= chroma_put;

  465. 

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

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

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

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

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

  471. 

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

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

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

  475.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  476.                     qpix_op, chroma_op, mv);

  477. 

  478.         qpix_op=  qpix_avg;

  479.         chroma_op= chroma_avg;

  480.     }

  481. 

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

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

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

  485.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  486.                     qpix_op, chroma_op, mv+MV_BWD_OFFS);

  487.     }

  488. }

  489. 

  490. static void inter_pred(AVSContext *h) {

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

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

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

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

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

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

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

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

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

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

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

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

  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_X2]);

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

  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_X3]);

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

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

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

  515. }

  516. 

  517. /*****************************************************************************

  518.  *

  519.  * motion vector prediction

  520.  *

  521.  ****************************************************************************/

  522. 

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

  524.     switch(size) {

  525.     case BLK_16X16:

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

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

  528.     case BLK_16X8:

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

  530.         break;

  531.     case BLK_8X16:

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

  533.         break;

  534.     }

  535. }

  536. 

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

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

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

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

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

  542. }

  543. 

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

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

  546. 

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

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

  549. }

  550. 

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

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

  553.     int len_ab, len_bc, len_ca, len_mid;

  554. 

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

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

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

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

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

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

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

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

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

  564.     if(len_mid == len_ab) {

  565.         mvP->x = cx;

  566.         mvP->y = cy;

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

  568.         mvP->x = ax;

  569.         mvP->y = ay;

  570.     } else {

  571.         mvP->x = bx;

  572.         mvP->y = by;

  573.     }

  574. }

  575. 

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

  577.                                   vector_t *col_mv) {

  578.     vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS;

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

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

  581. 

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

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

  584.     pmv_fw->ref = 1;

  585.     pmv_bw->ref = 0;

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

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

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

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

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

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

  592. }

  593. 

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

  595.     vector_t *dst = src + MV_BWD_OFFS;

  596. 

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

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

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

  600.     dst->ref = 0;

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

  602.     set_mvs(dst, size);

  603. }

  604. 

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

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

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

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

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

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

  611.     int mvAref = mvA->ref;

  612.     int mvBref = mvB->ref;

  613.     int mvCref;

  614. 

  615.     mvP->ref = ref;

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

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

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

  619.     mvCref = mvC->ref;

  620.     if(mode == MV_PRED_PSKIP) {

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

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

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

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

  625.             set_mvs(mvP,size);

  626.             return;

  627.         }

  628.     }

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

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

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

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

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

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

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

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

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

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

  639.     } else {

  640.         switch(mode) {

  641.         case MV_PRED_LEFT:

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

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

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

  645.             } else

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

  647.             break;

  648.         case MV_PRED_TOP:

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

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

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

  652.             } else

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

  654.             break;

  655.         case MV_PRED_TOPRIGHT:

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

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

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

  659.             } else

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

  661.             break;

  662.         default:

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

  664.             break;

  665.         }

  666.     }

  667.     if(mode < MV_PRED_PSKIP) {

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

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

  670.     }

  671.     set_mvs(mvP,size);

  672. }

  673. 

  674. /*****************************************************************************

  675.  *

  676.  * residual data decoding

  677.  *

  678.  ****************************************************************************/

  679. 

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

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

  682.     if(order) {

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

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

  685.     }

  686.     return get_ue_golomb(gb);

  687. }

  688. 

  689. /**

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

  691.  *  and add them to sample block

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

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

  694.  * @param qp quantizer

  695.  * @param dst location of sample block

  696.  * @param stride line stride in frame buffer

  697.  */

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

  699.                                  const residual_vlc_t *r, int esc_golomb_order,

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

  701.     int i,pos = -1;

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

  703.     int level_buf[64];

  704.     int run_buf[64];

  705.     int dqm = dequant_mul[qp];

  706.     int dqs = dequant_shift[qp];

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

  708.     const uint8_t *scantab = ff_zigzag_direct;

  709.     DCTELEM block[64];

  710. 

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

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

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

  714.         if(level_code >= ESCAPE_CODE) {

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

  716.             esc_code = get_ue_code(gb,esc_golomb_order);

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

  718.             while(level > r->inc_limit)

  719.                 r++;

  720.             mask = -(level_code & 1);

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

  722.         } else {

  723.             if(level_code < 0)

  724.                 return -1;

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

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

  727.                 break;

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

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

  730.         }

  731.         level_buf[i] = level;

  732.         run_buf[i] = run;

  733.     }

  734.     /* inverse scan and dequantization */

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

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

  737.         if(pos > 63) {

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

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

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

  741.             return -1;

  742.         }

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

  744.     }

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

  746.     return 0;

  747. }

  748. 

  749. 

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

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

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

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

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

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

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

  757. }

  758. 

  759. static inline void decode_residual_inter(AVSContext *h) {

  760.     int block;

  761. 

  762.     /* get coded block pattern */

  763.     h->cbp = cbp_tab[get_ue_golomb(&h->s.gb)][1];

  764.     /* get quantizer */

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

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

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

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

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

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

  771.     decode_residual_chroma(h);

  772. }

  773. 

  774. /*****************************************************************************

  775.  *

  776.  * macroblock level

  777.  *

  778.  ****************************************************************************/

  779. 

  780. /**

  781.  * initialise predictors for motion vectors and intra prediction

  782.  */

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

  784.     int i;

  785. 

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

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

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

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

  790.     }

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

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

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

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

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

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

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

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

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

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

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

  802.         h->flags |= D_AVAIL;

  803.     }

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

  805.         h->flags &= ~C_AVAIL;

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

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

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

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

  810.     }

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

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

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

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

  815.     }

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

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

  818. }

  819. 

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

  821. 

  822. /**

  823.  * save predictors for later macroblocks and increase

  824.  * macroblock address

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

  826.  */

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

  828.     int i;

  829. 

  830.     h->flags |= A_AVAIL;

  831.     h->cy += 16;

  832.     h->cu += 8;

  833.     h->cv += 8;

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

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

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

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

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

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

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

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

  842.     /* next MB address */

  843.     h->mbx++;

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

  845.         h->flags = B_AVAIL|C_AVAIL;

  846.         /* clear left pred_modes */

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

  848.         /* clear left mv predictors */

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

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

  851.         h->mbx = 0;

  852.         h->mby++;

  853.         /* re-calculate sample pointers */

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

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

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

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

  858.             return 0;

  859.         } else {

  860.             //check_for_slice(h);

  861.         }

  862.     }

  863.     return 1;

  864. }

  865. 

  866. static void decode_mb_i(AVSContext *h) {

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

  868.     int block, pred_mode_uv;

  869.     uint8_t top[18];

  870.     uint8_t left[18];

  871.     uint8_t *d;

  872. 

  873.     init_mb(h);

  874. 

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

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

  877.         int nA,nB,predpred;

  878.         int pos = scan3x3[block];

  879. 

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

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

  882.         if((nA == NOT_AVAIL) || (nB == NOT_AVAIL))

  883.             predpred = 2;

  884.         else

  885.             predpred = FFMIN(nA,nB);

  886.         if(get_bits1(gb))

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

  888.         else {

  889.             h->pred_mode_Y[pos] = get_bits(gb,2);

  890.             if(h->pred_mode_Y[pos] >= predpred)

  891.                 h->pred_mode_Y[pos]++;

  892.         }

  893.     }

  894.     pred_mode_uv = get_ue_golomb(gb);

  895.     if(pred_mode_uv > 6) {

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

  897.         pred_mode_uv = 0;

  898.     }

  899. 

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

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

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

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

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

  905. 

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

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

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

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

  910.         modify_pred(left_modifier_c, &pred_mode_uv );

  911.     }

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

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

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

  915.         modify_pred(top_modifier_c, &pred_mode_uv );

  916.     }

  917. 

  918.     /* get coded block pattern */

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

  920.         h->cbp = cbp_tab[get_ue_golomb(gb)][0];

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

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

  923. 

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

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

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

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

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

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

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

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

  932.     }

  933. 

  934.     /* chroma intra prediction */

  935.     /* extend borders by one pixel */

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

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

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

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

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

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

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

  943.     } else {

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

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

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

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

  948.     }

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

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

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

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

  953. 

  954.     decode_residual_chroma(h);

  955.     filter_mb(h,I_8X8);

  956. 

  957.     /* mark motion vectors as intra */

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

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

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

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

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

  963.         *h->col_type = I_8X8;

  964. }

  965. 

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

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

  968.     int ref[4];

  969. 

  970.     init_mb(h);

  971.     switch(mb_type) {

  972.     case P_SKIP:

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

  974.         break;

  975.     case P_16X16:

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

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

  978.         break;

  979.     case P_16X8:

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

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

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

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

  984.         break;

  985.     case P_8X16:

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

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

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

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

  990.         break;

  991.     case P_8X8:

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

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

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

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

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

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

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

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

  1000.     }

  1001.     inter_pred(h);

  1002.     store_mvs(h);

  1003.     if(mb_type != P_SKIP)

  1004.         decode_residual_inter(h);

  1005.     filter_mb(h,mb_type);

  1006.     *h->col_type = mb_type;

  1007. }

  1008. 

  1009. static void decode_mb_b(AVSContext *h, enum mb_t mb_type) {

  1010.     int block;

  1011.     enum sub_mb_t sub_type[4];

  1012.     int flags;

  1013. 

  1014.     init_mb(h);

  1015. 

  1016.     /* reset all MVs */

  1017.     h->mv[MV_FWD_X0] = dir_mv;

  1018.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1019.     h->mv[MV_BWD_X0] = dir_mv;

  1020.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1021.     switch(mb_type) {

  1022.     case B_SKIP:

  1023.     case B_DIRECT:

  1024.         if(!(*h->col_type)) {

  1025.             /* intra MB at co-location, do in-plane prediction */

  1026.             mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);

  1027.             mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);

  1028.         } else

  1029.             /* direct prediction from co-located P MB, block-wise */

  1030.             for(block=0;block<4;block++)

  1031.                 mv_pred_direct(h,&h->mv[mv_scan[block]],

  1032.                             &h->col_mv[(h->mby*h->mb_width+h->mbx)*4 + block]);

  1033.         break;

  1034.     case B_FWD_16X16:

  1035.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);

  1036.         break;

  1037.     case B_SYM_16X16:

  1038.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);

  1039.         mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);

  1040.         break;

  1041.     case B_BWD_16X16:

  1042.         mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);

  1043.         break;

  1044.     case B_8X8:

  1045.         for(block=0;block<4;block++)

  1046.             sub_type[block] = get_bits(&h->s.gb,2);

  1047.         for(block=0;block<4;block++) {

  1048.             switch(sub_type[block]) {

  1049.             case B_SUB_DIRECT:

  1050.                 if(!(*h->col_type)) {

  1051.                     /* intra MB at co-location, do in-plane prediction */

  1052.                     mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1053.                             MV_PRED_BSKIP, BLK_8X8, 1);

  1054.                     mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1055.                             mv_scan[block]-3+MV_BWD_OFFS,

  1056.                             MV_PRED_BSKIP, BLK_8X8, 0);

  1057.                 } else

  1058.                     mv_pred_direct(h,&h->mv[mv_scan[block]],

  1059.                                    &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);

  1060.                 break;

  1061.             case B_SUB_FWD:

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

  1063.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1064.                 break;

  1065.             case B_SUB_SYM:

  1066.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1067.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1068.                 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);

  1069.                 break;

  1070.             }

  1071.         }

  1072.         for(block=0;block<4;block++) {

  1073.             if(sub_type[block] == B_SUB_BWD)

  1074.                 mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1075.                         mv_scan[block]+MV_BWD_OFFS-3,

  1076.                         MV_PRED_MEDIAN, BLK_8X8, 0);

  1077.         }

  1078.         break;

  1079.     default:

  1080.         assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));

  1081.         flags = b_partition_flags[(mb_type-1)>>1];

  1082.         if(mb_type & 1) { /* 16x8 macroblock types */

  1083.             if(flags & FWD0)

  1084.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1085.             if(flags & SYM0) {

  1086.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1087.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);

  1088.             }

  1089.             if(flags & FWD1)

  1090.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1091.             if(flags & SYM1) {

  1092.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1093.                 mv_pred_sym(h, &h->mv[9], BLK_16X8);

  1094.             }

  1095.             if(flags & BWD0)

  1096.                 mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP,  BLK_16X8, 0);

  1097.             if(flags & BWD1)

  1098.                 mv_pred(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);

  1099.         } else {          /* 8x16 macroblock types */

  1100.             if(flags & FWD0)

  1101.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1102.             if(flags & SYM0) {

  1103.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1104.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);

  1105.             }

  1106.             if(flags & FWD1)

  1107.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1108.             if(flags & SYM1) {

  1109.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1110.                 mv_pred_sym(h, &h->mv[6], BLK_8X16);

  1111.             }

  1112.             if(flags & BWD0)

  1113.                 mv_pred(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);

  1114.             if(flags & BWD1)

  1115.                 mv_pred(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 0);

  1116.         }

  1117.     }

  1118.     inter_pred(h);

  1119.     if(mb_type != B_SKIP)

  1120.         decode_residual_inter(h);

  1121.     filter_mb(h,mb_type);

  1122. }

  1123. 

  1124. /*****************************************************************************

  1125.  *

  1126.  * slice level

  1127.  *

  1128.  ****************************************************************************/

  1129. 

  1130. static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {

  1131.     if(h->stc > 0xAF)

  1132.         av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);

  1133.     h->mby = h->stc;

  1134.     if((h->mby == 0) && (!h->qp_fixed)){

  1135.         h->qp_fixed = get_bits1(gb);

  1136.         h->qp = get_bits(gb,6);

  1137.     }

  1138.     /* inter frame or second slice can have weighting params */

  1139.     if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2))

  1140.         if(get_bits1(gb)) { //slice_weighting_flag

  1141.             av_log(h->s.avctx, AV_LOG_ERROR,

  1142.                    "weighted prediction not yet supported\n");

  1143.         }

  1144.     return 0;

  1145. }

  1146. 

  1147. static inline void check_for_slice(AVSContext *h) {

  1148.     GetBitContext *gb = &h->s.gb;

  1149.     int align;

  1150.     align = (-get_bits_count(gb)) & 7;

  1151.     if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {

  1152.         get_bits_long(gb,24+align);

  1153.         h->stc = get_bits(gb,8);

  1154.         decode_slice_header(h,gb);

  1155.     }

  1156. }

  1157. 

  1158. /*****************************************************************************

  1159.  *

  1160.  * frame level

  1161.  *

  1162.  ****************************************************************************/

  1163. 

  1164. static void init_pic(AVSContext *h) {

  1165.     int i;

  1166. 

  1167.     /* clear some predictors */

  1168.     for(i=0;i<=20;i+=4)

  1169.         h->mv[i] = un_mv;

  1170.     h->mv[MV_BWD_X0] = dir_mv;

  1171.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1172.     h->mv[MV_FWD_X0] = dir_mv;

  1173.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1174.     h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;

  1175.     h->cy = h->picture.data[0];

  1176.     h->cu = h->picture.data[1];

  1177.     h->cv = h->picture.data[2];

  1178.     h->l_stride = h->picture.linesize[0];

  1179.     h->c_stride = h->picture.linesize[1];

  1180.     h->luma_scan[2] = 8*h->l_stride;

  1181.     h->luma_scan[3] = 8*h->l_stride+8;

  1182.     h->mbx = h->mby = 0;

  1183.     h->flags = 0;

  1184. }

  1185. 

  1186. static int decode_pic(AVSContext *h) {

  1187.     MpegEncContext *s = &h->s;

  1188.     int skip_count;

  1189.     enum mb_t mb_type;

  1190. 

  1191.     if (!s->context_initialized) {

  1192.         if (MPV_common_init(s) < 0)

  1193.             return -1;

  1194.     }

  1195.     get_bits(&s->gb,16);//bbv_dwlay

  1196.     if(h->stc == PIC_PB_START_CODE) {

  1197.         h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE;

  1198.         /* make sure we have the reference frames we need */

  1199.         if(!h->DPB[0].data[0] ||

  1200.           (!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE))

  1201.             return -1;

  1202.     } else {

  1203.         h->pic_type = FF_I_TYPE;

  1204.         if(get_bits1(&s->gb))

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

  1206.     }

  1207.     /* release last B frame */

  1208.     if(h->picture.data[0])

  1209.         s->avctx->release_buffer(s->avctx, (AVFrame *)&h->picture);

  1210. 

  1211.     s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture);

  1212.     init_pic(h);

  1213.     h->picture.poc = get_bits(&s->gb,8)*2;

  1214. 

  1215.     /* get temporal distances and MV scaling factors */

  1216.     if(h->pic_type != FF_B_TYPE) {

  1217.         h->dist[0] = (h->picture.poc - h->DPB[0].poc  + 512) % 512;

  1218.     } else {

  1219.         h->dist[0] = (h->DPB[0].poc  - h->picture.poc + 512) % 512;

  1220.     }

  1221.     h->dist[1] = (h->picture.poc - h->DPB[1].poc  + 512) % 512;

  1222.     h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;

  1223.     h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;

  1224.     if(h->pic_type == FF_B_TYPE) {

  1225.         h->sym_factor = h->dist[0]*h->scale_den[1];

  1226.     } else {

  1227.         h->direct_den[0] = h->dist[0] ? 16384/h->dist[0] : 0;

  1228.         h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0;

  1229.     }

  1230. 

  1231.     if(s->low_delay)

  1232.         get_ue_golomb(&s->gb); //bbv_check_times

  1233.     h->progressive             = get_bits1(&s->gb);

  1234.     if(h->progressive)

  1235.         h->pic_structure = 1;

  1236.     else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) )

  1237.         get_bits1(&s->gb);     //advanced_pred_mode_disable

  1238.     skip_bits1(&s->gb);        //top_field_first

  1239.     skip_bits1(&s->gb);        //repeat_first_field

  1240.     h->qp_fixed                = get_bits1(&s->gb);

  1241.     h->qp                      = get_bits(&s->gb,6);

  1242.     if(h->pic_type == FF_I_TYPE) {

  1243.         if(!h->progressive && !h->pic_structure)

  1244.             skip_bits1(&s->gb);//what is this?

  1245.         skip_bits(&s->gb,4);   //reserved bits

  1246.     } else {

  1247.         if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1))

  1248.             h->ref_flag        = get_bits1(&s->gb);

  1249.         skip_bits(&s->gb,4);   //reserved bits

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

  1251.     }

  1252.     h->loop_filter_disable     = get_bits1(&s->gb);

  1253.     if(!h->loop_filter_disable && get_bits1(&s->gb)) {

  1254.         h->alpha_offset        = get_se_golomb(&s->gb);

  1255.         h->beta_offset         = get_se_golomb(&s->gb);

  1256.     } else {

  1257.         h->alpha_offset = h->beta_offset  = 0;

  1258.     }

  1259.     check_for_slice(h);

  1260.     if(h->pic_type == FF_I_TYPE) {

  1261.         do {

  1262.             decode_mb_i(h);

  1263.         } while(next_mb(h));

  1264.     } else if(h->pic_type == FF_P_TYPE) {

  1265.         do {

  1266.             if(h->skip_mode_flag) {

  1267.                 skip_count = get_ue_golomb(&s->gb);

  1268.                 while(skip_count--) {

  1269.                     decode_mb_p(h,P_SKIP);

  1270.                     if(!next_mb(h))

  1271.                         goto done;

  1272.                 }

  1273.                 mb_type = get_ue_golomb(&s->gb) + P_16X16;

  1274.             } else

  1275.                 mb_type = get_ue_golomb(&s->gb) + P_SKIP;

  1276.             if(mb_type > P_8X8) {

  1277.                 h->cbp = cbp_tab[mb_type - P_8X8 - 1][0];

  1278.                 decode_mb_i(h);

  1279.             } else

  1280.                 decode_mb_p(h,mb_type);

  1281.         } while(next_mb(h));

  1282.     } else { /* FF_B_TYPE */

  1283.         do {

  1284.             if(h->skip_mode_flag) {

  1285.                 skip_count = get_ue_golomb(&s->gb);

  1286.                 while(skip_count--) {

  1287.                     decode_mb_b(h,B_SKIP);

  1288.                     if(!next_mb(h))

  1289.                         goto done;

  1290.                 }

  1291.                 mb_type = get_ue_golomb(&s->gb) + B_DIRECT;

  1292.             } else

  1293.                 mb_type = get_ue_golomb(&s->gb) + B_SKIP;

  1294.             init_mb(h);

  1295.             if(mb_type > B_8X8) {

  1296.                 h->cbp = cbp_tab[mb_type - B_8X8 - 1][0];

  1297.                 decode_mb_i(h);

  1298.             } else

  1299.                 decode_mb_b(h,mb_type);

  1300.         } while(next_mb(h));

  1301.     }

  1302.  done:

  1303.     if(h->pic_type != FF_B_TYPE) {

  1304.         if(h->DPB[1].data[0])

  1305.             s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]);

  1306.         memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture));

  1307.         memcpy(&h->DPB[0], &h->picture, sizeof(Picture));

  1308.         memset(&h->picture,0,sizeof(Picture));

  1309.     }

  1310.     return 0;

  1311. }

  1312. 

  1313. /*****************************************************************************

  1314.  *

  1315.  * headers and interface

  1316.  *

  1317.  ****************************************************************************/

  1318. 

  1319. /**

  1320.  * some predictions require data from the top-neighbouring macroblock.

  1321.  * this data has to be stored for one complete row of macroblocks

  1322.  * and this storage space is allocated here

  1323.  */

  1324. static void init_top_lines(AVSContext *h) {

  1325.     /* alloc top line of predictors */

  1326.     h->top_qp       = av_malloc( h->mb_width);

  1327.     h->top_mv[0]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1328.     h->top_mv[1]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1329.     h->top_pred_Y   = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));

  1330.     h->top_border_y = av_malloc((h->mb_width+1)*16);

  1331.     h->top_border_u = av_malloc((h->mb_width)*10);

  1332.     h->top_border_v = av_malloc((h->mb_width)*10);

  1333. 

  1334.     /* alloc space for co-located MVs and types */

  1335.     h->col_mv       = av_malloc( h->mb_width*h->mb_height*4*sizeof(vector_t));

  1336.     h->col_type_base = av_malloc(h->mb_width*h->mb_height);

  1337. }

  1338. 

  1339. static int decode_seq_header(AVSContext *h) {

  1340.     MpegEncContext *s = &h->s;

  1341.     extern const AVRational ff_frame_rate_tab[];

  1342.     int frame_rate_code;

  1343. 

  1344.     h->profile =         get_bits(&s->gb,8);

  1345.     h->level =           get_bits(&s->gb,8);

  1346.     skip_bits1(&s->gb); //progressive sequence

  1347.     s->width =           get_bits(&s->gb,14);

  1348.     s->height =          get_bits(&s->gb,14);

  1349.     skip_bits(&s->gb,2); //chroma format

  1350.     skip_bits(&s->gb,3); //sample_precision

  1351.     h->aspect_ratio =    get_bits(&s->gb,4);

  1352.     frame_rate_code =    get_bits(&s->gb,4);

  1353.     skip_bits(&s->gb,18);//bit_rate_lower

  1354.     skip_bits1(&s->gb);  //marker_bit

  1355.     skip_bits(&s->gb,12);//bit_rate_upper

  1356.     s->low_delay =       get_bits1(&s->gb);

  1357.     h->mb_width  = (s->width  + 15) >> 4;

  1358.     h->mb_height = (s->height + 15) >> 4;

  1359.     h->s.avctx->time_base.den = ff_frame_rate_tab[frame_rate_code].num;

  1360.     h->s.avctx->time_base.num = ff_frame_rate_tab[frame_rate_code].den;

  1361.     h->s.avctx->width  = s->width;

  1362.     h->s.avctx->height = s->height;

  1363.     if(!h->top_qp)

  1364.         init_top_lines(h);

  1365.     return 0;

  1366. }

  1367. 

  1368. /**

  1369.  * finds the end of the current frame in the bitstream.

  1370.  * @return the position of the first byte of the next frame, or -1

  1371.  */

  1372. int ff_cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) {

  1373.     int pic_found, i;

  1374.     uint32_t state;

  1375. 

  1376.     pic_found= pc->frame_start_found;

  1377.     state= pc->state;

  1378. 

  1379.     i=0;

  1380.     if(!pic_found){

  1381.         for(i=0; i<buf_size; i++){

  1382.             state= (state<<8) | buf[i];

  1383.             if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){

  1384.                 i++;

  1385.                 pic_found=1;

  1386.                 break;

  1387.             }

  1388.         }

  1389.     }

  1390. 

  1391.     if(pic_found){

  1392.         /* EOF considered as end of frame */

  1393.         if (buf_size == 0)

  1394.             return 0;

  1395.         for(; i<buf_size; i++){

  1396.             state= (state<<8) | buf[i];

  1397.             if((state&0xFFFFFF00) == 0x100){

  1398.                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){

  1399.                     pc->frame_start_found=0;

  1400.                     pc->state=-1;

  1401.                     return i-3;

  1402.                 }

  1403.             }

  1404.         }

  1405.     }

  1406.     pc->frame_start_found= pic_found;

  1407.     pc->state= state;

  1408.     return END_NOT_FOUND;

  1409. }

  1410. 

  1411. void ff_cavs_flush(AVCodecContext * avctx) {

  1412.     AVSContext *h = avctx->priv_data;

  1413.     h->got_keyframe = 0;

  1414. }

  1415. 

  1416. static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size,

  1417.                              uint8_t * buf, int buf_size) {

  1418.     AVSContext *h = avctx->priv_data;

  1419.     MpegEncContext *s = &h->s;

  1420.     int input_size;

  1421.     const uint8_t *buf_end;

  1422.     const uint8_t *buf_ptr;

  1423.     AVFrame *picture = data;

  1424.     uint32_t stc;

  1425. 

  1426.     s->avctx = avctx;

  1427. 

  1428.     if (buf_size == 0) {

  1429.         if(!s->low_delay && h->DPB[0].data[0]) {

  1430.             *data_size = sizeof(AVPicture);

  1431.             *picture = *(AVFrame *) &h->DPB[0];

  1432.         }

  1433.         return 0;

  1434.     }

  1435. 

  1436.     buf_ptr = buf;

  1437.     buf_end = buf + buf_size;

  1438.     for(;;) {

  1439.         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &stc);

  1440.         if(stc & 0xFFFFFE00)

  1441.             return FFMAX(0, buf_ptr - buf - s->parse_context.last_index);

  1442.         input_size = (buf_end - buf_ptr)*8;

  1443.         switch(stc) {

  1444.         case SEQ_START_CODE:

  1445.             init_get_bits(&s->gb, buf_ptr, input_size);

  1446.             decode_seq_header(h);

  1447.             break;

  1448.         case PIC_I_START_CODE:

  1449.             if(!h->got_keyframe) {

  1450.                 if(h->DPB[0].data[0])

  1451.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[0]);

  1452.                 if(h->DPB[1].data[0])

  1453.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[1]);

  1454.                 h->got_keyframe = 1;

  1455.             }

  1456.         case PIC_PB_START_CODE:

  1457.             *data_size = 0;

  1458.             if(!h->got_keyframe)

  1459.                 break;

  1460.             init_get_bits(&s->gb, buf_ptr, input_size);

  1461.             h->stc = stc;

  1462.             if(decode_pic(h))

  1463.                 break;

  1464.             *data_size = sizeof(AVPicture);

  1465.             if(h->pic_type != FF_B_TYPE) {

  1466.                 if(h->DPB[1].data[0]) {

  1467.                     *picture = *(AVFrame *) &h->DPB[1];

  1468.                 } else {

  1469.                     *data_size = 0;

  1470.                 }

  1471.             } else

  1472.                 *picture = *(AVFrame *) &h->picture;

  1473.             break;

  1474.         case EXT_START_CODE:

  1475.             //mpeg_decode_extension(avctx,buf_ptr, input_size);

  1476.             break;

  1477.         case USER_START_CODE:

  1478.             //mpeg_decode_user_data(avctx,buf_ptr, input_size);

  1479.             break;

  1480.         default:

  1481.             if (stc >= SLICE_MIN_START_CODE &&

  1482.                 stc <= SLICE_MAX_START_CODE) {

  1483.                 init_get_bits(&s->gb, buf_ptr, input_size);

  1484.                 decode_slice_header(h, &s->gb);

  1485.             }

  1486.             break;

  1487.         }

  1488.     }

  1489. }

  1490. 

  1491. static int cavs_decode_init(AVCodecContext * avctx) {

  1492.     AVSContext *h = avctx->priv_data;

  1493.     MpegEncContext * const s = &h->s;

  1494. 

  1495.     MPV_decode_defaults(s);

  1496.     s->avctx = avctx;

  1497. 

  1498.     avctx->pix_fmt= PIX_FMT_YUV420P;

  1499. 

  1500.     h->luma_scan[0] = 0;

  1501.     h->luma_scan[1] = 8;

  1502.     h->intra_pred_l[      INTRA_L_VERT] = intra_pred_vert;

  1503.     h->intra_pred_l[     INTRA_L_HORIZ] = intra_pred_horiz;

  1504.     h->intra_pred_l[        INTRA_L_LP] = intra_pred_lp;

  1505.     h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;

  1506.     h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;

  1507.     h->intra_pred_l[   INTRA_L_LP_LEFT] = intra_pred_lp_left;

  1508.     h->intra_pred_l[    INTRA_L_LP_TOP] = intra_pred_lp_top;

  1509.     h->intra_pred_l[    INTRA_L_DC_128] = intra_pred_dc_128;

  1510.     h->intra_pred_c[        INTRA_C_LP] = intra_pred_lp;

  1511.     h->intra_pred_c[     INTRA_C_HORIZ] = intra_pred_horiz;

  1512.     h->intra_pred_c[      INTRA_C_VERT] = intra_pred_vert;

  1513.     h->intra_pred_c[     INTRA_C_PLANE] = intra_pred_plane;

  1514.     h->intra_pred_c[   INTRA_C_LP_LEFT] = intra_pred_lp_left;

  1515.     h->intra_pred_c[    INTRA_C_LP_TOP] = intra_pred_lp_top;

  1516.     h->intra_pred_c[    INTRA_C_DC_128] = intra_pred_dc_128;

  1517.     h->mv[ 7] = un_mv;

  1518.     h->mv[19] = un_mv;

  1519.     return 0;

  1520. }

  1521. 

  1522. static int cavs_decode_end(AVCodecContext * avctx) {

  1523.     AVSContext *h = avctx->priv_data;

  1524. 

  1525.     av_free(h->top_qp);

  1526.     av_free(h->top_mv[0]);

  1527.     av_free(h->top_mv[1]);

  1528.     av_free(h->top_pred_Y);

  1529.     av_free(h->top_border_y);

  1530.     av_free(h->top_border_u);

  1531.     av_free(h->top_border_v);

  1532.     av_free(h->col_mv);

  1533.     av_free(h->col_type_base);

  1534.     return 0;

  1535. }

  1536. 

  1537. AVCodec cavs_decoder = {

  1538.     "cavs",

  1539.     CODEC_TYPE_VIDEO,

  1540.     CODEC_ID_CAVS,

  1541.     sizeof(AVSContext),

  1542.     cavs_decode_init,

  1543.     NULL,

  1544.     cavs_decode_end,

  1545.     cavs_decode_frame,

  1546.     CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1547.     .flush= ff_cavs_flush,

  1548. };