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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 file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

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

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

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

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

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

  15.  * Lesser General Public License for more details.

  16.  *

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

  18.  * License along with FFmpeg; if not, write to the Free Software

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

  20.  */

  21. 

  22. /**

  23.  * @file cavs.c

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

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

  26.  */

  27. 

  28. #include "avcodec.h"

  29. #include "bitstream.h"

  30. #include "golomb.h"

  31. #include "mpegvideo.h"

  32. #include "cavsdata.h"

  33. 

  34. typedef struct {

  35.     MpegEncContext s;

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

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

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

  39.     int profile, level;

  40.     int aspect_ratio;

  41.     int mb_width, mb_height;

  42.     int pic_type;

  43.     int progressive;

  44.     int pic_structure;

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

  46.     int loop_filter_disable;

  47.     int alpha_offset, beta_offset;

  48.     int ref_flag;

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

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

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

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

  53.     int left_qp;

  54.     uint8_t *top_qp;

  55. 

  56.     /** mv motion vector cache

  57.        0:    D3  B2  B3  C2

  58.        4:    A1  X0  X1   -

  59.        8:    A3  X2  X3   -

  60. 

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

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

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

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

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

  66. 

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

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

  69.     vector_t *top_mv[2];

  70.     vector_t *col_mv;

  71. 

  72.     /** luma pred mode cache

  73.        0:    --  B2  B3

  74.        3:    A1  X0  X1

  75.        6:    A3  X2  X3   */

  76.     int pred_mode_Y[3*3];

  77.     int *top_pred_Y;

  78.     int l_stride, c_stride;

  79.     int luma_scan[4];

  80.     int qp;

  81.     int qp_fixed;

  82.     int cbp;

  83.     ScanTable scantable;

  84. 

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

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

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

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

  89.     uint8_t intern_border_y[26];

  90.     uint8_t topleft_border_y, topleft_border_u, topleft_border_v;

  91. 

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

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

  94.     uint8_t *col_type_base;

  95.     uint8_t *col_type;

  96. 

  97.     /* scaling factors for MV prediction */

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

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

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

  101. 

  102.     int got_keyframe;

  103.     DCTELEM *block;

  104. } AVSContext;

  105. 

  106. /*****************************************************************************

  107.  *

  108.  * in-loop deblocking filter

  109.  *

  110.  ****************************************************************************/

  111. 

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

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

  114.         return 2;

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

  116.         return 1;

  117.     if(b){

  118.         mvP += MV_BWD_OFFS;

  119.         mvQ += MV_BWD_OFFS;

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

  121.             return 1;

  122.     }else{

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

  124.             return 1;

  125.     }

  126.     return 0;

  127. }

  128. 

  129. #define SET_PARAMS                                            \

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

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

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

  133. 

  134. /**

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

  136.  *

  137.  * boundary strength (bs) mapping:

  138.  *

  139.  * --4---5--

  140.  * 0   2   |

  141.  * | 6 | 7 |

  142.  * 1   3   |

  143.  * ---------

  144.  *

  145.  */

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

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

  148.     int qp_avg, alpha, beta, tc;

  149.     int i;

  150. 

  151.     /* save un-deblocked lines */

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

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

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

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

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

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

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

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

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

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

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

  163.     }

  164.     if(!h->loop_filter_disable) {

  165.         /* determine bs */

  166.         if(mb_type == I_8X8)

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

  168.         else{

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

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

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

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

  173.             }

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

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

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

  177.             }

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

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

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

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

  182.         }

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

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

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

  186.                 SET_PARAMS;

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

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

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

  190.             }

  191.             qp_avg = h->qp;

  192.             SET_PARAMS;

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

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

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

  196. 

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

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

  199.                 SET_PARAMS;

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

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

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

  203.             }

  204.         }

  205.     }

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

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

  208. }

  209. 

  210. #undef SET_PARAMS

  211. 

  212. /*****************************************************************************

  213.  *

  214.  * spatial intra prediction

  215.  *

  216.  ****************************************************************************/

  217. 

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

  219.                                         uint8_t **left, int block) {

  220.     int i;

  221. 

  222.     switch(block) {

  223.     case 0:

  224.         *left = h->left_border_y;

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

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

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

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

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

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

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

  232.         break;

  233.     case 1:

  234.         *left = h->intern_border_y;

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

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

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

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

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

  240.         if(h->flags & C_AVAIL)

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

  242.         else

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

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

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

  246.         if(h->flags & B_AVAIL)

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

  248.         break;

  249.     case 2:

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

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

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

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

  254.         if(h->flags & A_AVAIL)

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

  256.         break;

  257.     case 3:

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

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

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

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

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

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

  264.         break;

  265.     }

  266. }

  267. 

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

  269.     int y;

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

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

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

  273.     }

  274. }

  275. 

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

  277.     int y;

  278.     uint64_t a;

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

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

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

  282.     }

  283. }

  284. 

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

  286.     int y;

  287.     uint64_t a = 0x8080808080808080ULL;

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

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

  290. }

  291. 

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

  293.     int x,y,ia;

  294.     int ih = 0;

  295.     int iv = 0;

  296.     uint8_t *cm = cropTbl + MAX_NEG_CROP;

  297. 

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

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

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

  301.     }

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

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

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

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

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

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

  308. }

  309. 

  310. #define LOWPASS(ARRAY,INDEX)                                            \

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

  312. 

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

  314.     int x,y;

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

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

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

  318. }

  319. 

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

  321.     int x,y;

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

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

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

  325. }

  326. 

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

  328.     int x,y;

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

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

  331.             if(x==y)

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

  333.             else if(x>y)

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

  335.             else

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

  337. }

  338. 

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

  340.     int x,y;

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

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

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

  344. }

  345. 

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

  347.     int x,y;

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

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

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

  351. }

  352. 

  353. #undef LOWPASS

  354. 

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

  356.     *mode = mod_table[*mode];

  357.     if(*mode < 0) {

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

  359.         *mode = 0;

  360.     }

  361. }

  362. 

  363. /*****************************************************************************

  364.  *

  365.  * motion compensation

  366.  *

  367.  ****************************************************************************/

  368. 

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

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

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

  372.                         int src_y_offset,qpel_mc_func *qpix_op,

  373.                         h264_chroma_mc_func chroma_op,vector_t *mv){

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

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

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

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

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

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

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

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

  382.     int extra_height= extra_width;

  383.     int emu=0;

  384.     const int full_mx= mx>>2;

  385.     const int full_my= my>>2;

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

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

  388. 

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

  390.         return;

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

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

  393. 

  394.     if(   full_mx < 0-extra_width

  395.           || full_my < 0-extra_height

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

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

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

  399.                             16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);

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

  401.         emu=1;

  402.     }

  403. 

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

  405.     if(!square){

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

  407.     }

  408. 

  409.     if(emu){

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

  411.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  412.         src_cb= s->edge_emu_buffer;

  413.     }

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

  415. 

  416.     if(emu){

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

  418.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  419.         src_cr= s->edge_emu_buffer;

  420.     }

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

  422. }

  423. 

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

  425.                         uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,

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

  427.                         h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,

  428.                         h264_chroma_mc_func chroma_avg, vector_t *mv){

  429.     qpel_mc_func *qpix_op=  qpix_put;

  430.     h264_chroma_mc_func chroma_op= chroma_put;

  431. 

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

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

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

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

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

  437. 

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

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

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

  441.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  442.                     qpix_op, chroma_op, mv);

  443. 

  444.         qpix_op=  qpix_avg;

  445.         chroma_op= chroma_avg;

  446.     }

  447. 

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

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

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

  451.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  452.                     qpix_op, chroma_op, mv+MV_BWD_OFFS);

  453.     }

  454. }

  455. 

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

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

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

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

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

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

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

  463.     }else{

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  484.     }

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

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

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

  488. }

  489. 

  490. /*****************************************************************************

  491.  *

  492.  * motion vector prediction

  493.  *

  494.  ****************************************************************************/

  495. 

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

  497.     switch(size) {

  498.     case BLK_16X16:

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

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

  501.     case BLK_16X8:

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

  503.         break;

  504.     case BLK_8X16:

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

  506.         break;

  507.     }

  508. }

  509. 

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

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

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

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

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

  515. }

  516. 

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

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

  519. 

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

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

  522. }

  523. 

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

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

  526.     int len_ab, len_bc, len_ca, len_mid;

  527. 

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

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

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

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

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

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

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

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

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

  537.     if(len_mid == len_ab) {

  538.         mvP->x = cx;

  539.         mvP->y = cy;

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

  541.         mvP->x = ax;

  542.         mvP->y = ay;

  543.     } else {

  544.         mvP->x = bx;

  545.         mvP->y = by;

  546.     }

  547. }

  548. 

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

  550.                                   vector_t *col_mv) {

  551.     vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS;

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

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

  554. 

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

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

  557.     pmv_fw->ref = 1;

  558.     pmv_bw->ref = 0;

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

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

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

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

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

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

  565. }

  566. 

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

  568.     vector_t *dst = src + MV_BWD_OFFS;

  569. 

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

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

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

  573.     dst->ref = 0;

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

  575.     set_mvs(dst, size);

  576. }

  577. 

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

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

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

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

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

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

  584.     const vector_t *mvP2 = NULL;

  585. 

  586.     mvP->ref = ref;

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

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

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

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

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

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

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

  594.         mvP2 = &un_mv;

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

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

  597.         mvP2= mvA;

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

  599.         mvP2= mvB;

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

  601.         mvP2= mvC;

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

  603.         mvP2= mvA;

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

  605.         mvP2= mvB;

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

  607.         mvP2= mvC;

  608.     }

  609.     if(mvP2){

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

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

  612.     }else

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

  614. 

  615.     if(mode < MV_PRED_PSKIP) {

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

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

  618.     }

  619.     set_mvs(mvP,size);

  620. }

  621. 

  622. /*****************************************************************************

  623.  *

  624.  * residual data decoding

  625.  *

  626.  ****************************************************************************/

  627. 

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

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

  630.     if(order) {

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

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

  633.     }

  634.     return get_ue_golomb(gb);

  635. }

  636. 

  637. /**

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

  639.  *  and add them to sample block

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

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

  642.  * @param qp quantizer

  643.  * @param dst location of sample block

  644.  * @param stride line stride in frame buffer

  645.  */

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

  647.                                  const residual_vlc_t *r, int esc_golomb_order,

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

  649.     int i,pos = -1;

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

  651.     int level_buf[64];

  652.     int run_buf[64];

  653.     int dqm = dequant_mul[qp];

  654.     int dqs = dequant_shift[qp];

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

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

  657.     DCTELEM *block = h->block;

  658. 

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

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

  661.         if(level_code >= ESCAPE_CODE) {

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

  663.             esc_code = get_ue_code(gb,esc_golomb_order);

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

  665.             while(level > r->inc_limit)

  666.                 r++;

  667.             mask = -(level_code & 1);

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

  669.         } else {

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

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

  672.                 break;

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

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

  675.         }

  676.         level_buf[i] = level;

  677.         run_buf[i] = run;

  678.     }

  679.     /* inverse scan and dequantization */

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

  681.         pos += run_buf[i];

  682.         if(pos > 63) {

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

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

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

  686.             return -1;

  687.         }

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

  689.     }

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

  691.     return 0;

  692. }

  693. 

  694. 

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

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

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

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

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

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

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

  702. }

  703. 

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

  705.     int block;

  706. 

  707.     /* get coded block pattern */

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

  709.     if(cbp > 63){

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

  711.         return -1;

  712.     }

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

  714. 

  715.     /* get quantizer */

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

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

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

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

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

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

  722.     decode_residual_chroma(h);

  723. 

  724.     return 0;

  725. }

  726. 

  727. /*****************************************************************************

  728.  *

  729.  * macroblock level

  730.  *

  731.  ****************************************************************************/

  732. 

  733. /**

  734.  * initialise predictors for motion vectors and intra prediction

  735.  */

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

  737.     int i;

  738. 

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

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

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

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

  743.     }

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

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

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

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

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

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

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

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

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

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

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

  755.         h->flags |= D_AVAIL;

  756.     }

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

  758.         h->flags &= ~C_AVAIL;

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

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

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

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

  763.     }

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

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

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

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

  768.     }

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

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

  771. }

  772. 

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

  774. 

  775. /**

  776.  * save predictors for later macroblocks and increase

  777.  * macroblock address

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

  779.  */

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

  781.     int i;

  782. 

  783.     h->flags |= A_AVAIL;

  784.     h->cy += 16;

  785.     h->cu += 8;

  786.     h->cv += 8;

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

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

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

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

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

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

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

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

  795.     /* next MB address */

  796.     h->mbx++;

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

  798.         h->flags = B_AVAIL|C_AVAIL;

  799.         /* clear left pred_modes */

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

  801.         /* clear left mv predictors */

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

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

  804.         h->mbx = 0;

  805.         h->mby++;

  806.         /* re-calculate sample pointers */

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

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

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

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

  811.             return 0;

  812.         } else {

  813.             //check_for_slice(h);

  814.         }

  815.     }

  816.     return 1;

  817. }

  818. 

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

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

  821.     int block, pred_mode_uv;

  822.     uint8_t top[18];

  823.     uint8_t *left = NULL;

  824.     uint8_t *d;

  825. 

  826.     init_mb(h);

  827. 

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

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

  830.         int nA,nB,predpred;

  831.         int pos = scan3x3[block];

  832. 

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

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

  835.         predpred = FFMIN(nA,nB);

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

  837.             predpred = INTRA_L_LP;

  838.         if(!get_bits1(gb)){

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

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

  841.         }

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

  843.     }

  844.     pred_mode_uv = get_ue_golomb(gb);

  845.     if(pred_mode_uv > 6) {

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

  847.         return -1;

  848.     }

  849. 

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

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

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

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

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

  855. 

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

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

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

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

  860.         modify_pred(left_modifier_c, &pred_mode_uv );

  861.     }

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

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

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

  865.         modify_pred(top_modifier_c, &pred_mode_uv );

  866.     }

  867. 

  868.     /* get coded block pattern */

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

  870.         cbp_code = get_ue_golomb(gb);

  871.     if(cbp_code > 63){

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

  873.         return -1;

  874.     }

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

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

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

  878. 

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

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

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

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

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

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

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

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

  887.     }

  888. 

  889.     /* chroma intra prediction */

  890.     /* extend borders by one pixel */

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

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

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

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

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

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

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

  898.     } else {

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

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

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

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

  903.     }

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

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

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

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

  908. 

  909.     decode_residual_chroma(h);

  910.     filter_mb(h,I_8X8);

  911. 

  912.     /* mark motion vectors as intra */

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

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

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

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

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

  918.         *h->col_type = I_8X8;

  919. 

  920.     return 0;

  921. }

  922. 

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

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

  925.     int ref[4];

  926. 

  927.     init_mb(h);

  928.     switch(mb_type) {

  929.     case P_SKIP:

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

  931.         break;

  932.     case P_16X16:

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

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

  935.         break;

  936.     case P_16X8:

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

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

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

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

  941.         break;

  942.     case P_8X16:

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

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

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

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

  947.         break;

  948.     case P_8X8:

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

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

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

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

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

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

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

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

  957.     }

  958.     inter_pred(h, mb_type);

  959.     store_mvs(h);

  960.     if(mb_type != P_SKIP)

  961.         decode_residual_inter(h);

  962.     filter_mb(h,mb_type);

  963.     *h->col_type = mb_type;

  964. }

  965. 

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

  967.     int block;

  968.     enum sub_mb_t sub_type[4];

  969.     int flags;

  970. 

  971.     init_mb(h);

  972. 

  973.     /* reset all MVs */

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

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

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

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

  978.     switch(mb_type) {

  979.     case B_SKIP:

  980.     case B_DIRECT:

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

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

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

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

  985.         } else

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

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

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

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

  990.         break;

  991.     case B_FWD_16X16:

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

  993.         break;

  994.     case B_SYM_16X16:

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

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

  997.         break;

  998.     case B_BWD_16X16:

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

  1000.         break;

  1001.     case B_8X8:

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

  1003.             sub_type[block] = get_bits(&h->s.gb,2);

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

  1005.             switch(sub_type[block]) {

  1006.             case B_SUB_DIRECT:

  1007.                 if(!(*h->col_type)) {

  1008.                     /* intra MB at co-location, do in-plane prediction */

  1009.                     mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1010.                             MV_PRED_BSKIP, BLK_8X8, 1);

  1011.                     mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1012.                             mv_scan[block]-3+MV_BWD_OFFS,

  1013.                             MV_PRED_BSKIP, BLK_8X8, 0);

  1014.                 } else

  1015.                     mv_pred_direct(h,&h->mv[mv_scan[block]],

  1016.                                    &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);

  1017.                 break;

  1018.             case B_SUB_FWD:

  1019.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1020.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1021.                 break;

  1022.             case B_SUB_SYM:

  1023.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1024.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1025.                 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);

  1026.                 break;

  1027.             }

  1028.         }

  1029.         for(block=0;block<4;block++) {

  1030.             if(sub_type[block] == B_SUB_BWD)

  1031.                 mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1032.                         mv_scan[block]+MV_BWD_OFFS-3,

  1033.                         MV_PRED_MEDIAN, BLK_8X8, 0);

  1034.         }

  1035.         break;

  1036.     default:

  1037.         assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));

  1038.         flags = partition_flags[mb_type];

  1039.         if(mb_type & 1) { /* 16x8 macroblock types */

  1040.             if(flags & FWD0)

  1041.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1042.             if(flags & SYM0)

  1043.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);

  1044.             if(flags & FWD1)

  1045.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1046.             if(flags & SYM1)

  1047.                 mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);

  1048.             if(flags & BWD0)

  1049.                 mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP,  BLK_16X8, 0);

  1050.             if(flags & BWD1)

  1051.                 mv_pred(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);

  1052.         } else {          /* 8x16 macroblock types */

  1053.             if(flags & FWD0)

  1054.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1055.             if(flags & SYM0)

  1056.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);

  1057.             if(flags & FWD1)

  1058.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1059.             if(flags & SYM1)

  1060.                 mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);

  1061.             if(flags & BWD0)

  1062.                 mv_pred(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);

  1063.             if(flags & BWD1)

  1064.                 mv_pred(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 0);

  1065.         }

  1066.     }

  1067.     inter_pred(h, mb_type);

  1068.     if(mb_type != B_SKIP)

  1069.         decode_residual_inter(h);

  1070.     filter_mb(h,mb_type);

  1071. }

  1072. 

  1073. /*****************************************************************************

  1074.  *

  1075.  * slice level

  1076.  *

  1077.  ****************************************************************************/

  1078. 

  1079. static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {

  1080.     if(h->stc > 0xAF)

  1081.         av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);

  1082.     h->mby = h->stc;

  1083.     if((h->mby == 0) && (!h->qp_fixed)){

  1084.         h->qp_fixed = get_bits1(gb);

  1085.         h->qp = get_bits(gb,6);

  1086.     }

  1087.     /* inter frame or second slice can have weighting params */

  1088.     if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2))

  1089.         if(get_bits1(gb)) { //slice_weighting_flag

  1090.             av_log(h->s.avctx, AV_LOG_ERROR,

  1091.                    "weighted prediction not yet supported\n");

  1092.         }

  1093.     return 0;

  1094. }

  1095. 

  1096. static inline void check_for_slice(AVSContext *h) {

  1097.     GetBitContext *gb = &h->s.gb;

  1098.     int align;

  1099.     align = (-get_bits_count(gb)) & 7;

  1100.     if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {

  1101.         get_bits_long(gb,24+align);

  1102.         h->stc = get_bits(gb,8);

  1103.         decode_slice_header(h,gb);

  1104.     }

  1105. }

  1106. 

  1107. /*****************************************************************************

  1108.  *

  1109.  * frame level

  1110.  *

  1111.  ****************************************************************************/

  1112. 

  1113. static void init_pic(AVSContext *h) {

  1114.     int i;

  1115. 

  1116.     /* clear some predictors */

  1117.     for(i=0;i<=20;i+=4)

  1118.         h->mv[i] = un_mv;

  1119.     h->mv[MV_BWD_X0] = dir_mv;

  1120.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1121.     h->mv[MV_FWD_X0] = dir_mv;

  1122.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1123.     h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;

  1124.     h->cy = h->picture.data[0];

  1125.     h->cu = h->picture.data[1];

  1126.     h->cv = h->picture.data[2];

  1127.     h->l_stride = h->picture.linesize[0];

  1128.     h->c_stride = h->picture.linesize[1];

  1129.     h->luma_scan[2] = 8*h->l_stride;

  1130.     h->luma_scan[3] = 8*h->l_stride+8;

  1131.     h->mbx = h->mby = 0;

  1132.     h->flags = 0;

  1133. }

  1134. 

  1135. static int decode_pic(AVSContext *h) {

  1136.     MpegEncContext *s = &h->s;

  1137.     int skip_count;

  1138.     enum mb_t mb_type;

  1139. 

  1140.     if (!s->context_initialized) {

  1141.         s->avctx->idct_algo = FF_IDCT_CAVS;

  1142.         if (MPV_common_init(s) < 0)

  1143.             return -1;

  1144.         ff_init_scantable(s->dsp.idct_permutation,&h->scantable,ff_zigzag_direct);

  1145.     }

  1146.     get_bits(&s->gb,16);//bbv_dwlay

  1147.     if(h->stc == PIC_PB_START_CODE) {

  1148.         h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE;

  1149.         if(h->pic_type > FF_B_TYPE) {

  1150.             av_log(s->avctx, AV_LOG_ERROR, "illegal picture type\n");

  1151.             return -1;

  1152.         }

  1153.         /* make sure we have the reference frames we need */

  1154.         if(!h->DPB[0].data[0] ||

  1155.           (!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE))

  1156.             return -1;

  1157.     } else {

  1158.         h->pic_type = FF_I_TYPE;

  1159.         if(get_bits1(&s->gb))

  1160.             get_bits(&s->gb,16);//time_code

  1161.     }

  1162.     /* release last B frame */

  1163.     if(h->picture.data[0])

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

  1165. 

  1166.     s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture);

  1167.     init_pic(h);

  1168.     h->picture.poc = get_bits(&s->gb,8)*2;

  1169. 

  1170.     /* get temporal distances and MV scaling factors */

  1171.     if(h->pic_type != FF_B_TYPE) {

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

  1173.     } else {

  1174.         h->dist[0] = (h->DPB[0].poc  - h->picture.poc + 512) % 512;

  1175.     }

  1176.     h->dist[1] = (h->picture.poc - h->DPB[1].poc  + 512) % 512;

  1177.     h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;

  1178.     h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;

  1179.     if(h->pic_type == FF_B_TYPE) {

  1180.         h->sym_factor = h->dist[0]*h->scale_den[1];

  1181.     } else {

  1182.         h->direct_den[0] = h->dist[0] ? 16384/h->dist[0] : 0;

  1183.         h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0;

  1184.     }

  1185. 

  1186.     if(s->low_delay)

  1187.         get_ue_golomb(&s->gb); //bbv_check_times

  1188.     h->progressive             = get_bits1(&s->gb);

  1189.     if(h->progressive)

  1190.         h->pic_structure = 1;

  1191.     else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) )

  1192.         get_bits1(&s->gb);     //advanced_pred_mode_disable

  1193.     skip_bits1(&s->gb);        //top_field_first

  1194.     skip_bits1(&s->gb);        //repeat_first_field

  1195.     h->qp_fixed                = get_bits1(&s->gb);

  1196.     h->qp                      = get_bits(&s->gb,6);

  1197.     if(h->pic_type == FF_I_TYPE) {

  1198.         if(!h->progressive && !h->pic_structure)

  1199.             skip_bits1(&s->gb);//what is this?

  1200.         skip_bits(&s->gb,4);   //reserved bits

  1201.     } else {

  1202.         if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1))

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

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

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

  1206.     }

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

  1208.     if(!h->loop_filter_disable && get_bits1(&s->gb)) {

  1209.         h->alpha_offset        = get_se_golomb(&s->gb);

  1210.         h->beta_offset         = get_se_golomb(&s->gb);

  1211.     } else {

  1212.         h->alpha_offset = h->beta_offset  = 0;

  1213.     }

  1214.     check_for_slice(h);

  1215.     if(h->pic_type == FF_I_TYPE) {

  1216.         do {

  1217.             decode_mb_i(h, 0);

  1218.         } while(next_mb(h));

  1219.     } else if(h->pic_type == FF_P_TYPE) {

  1220.         do {

  1221.             if(h->skip_mode_flag) {

  1222.                 skip_count = get_ue_golomb(&s->gb);

  1223.                 while(skip_count--) {

  1224.                     decode_mb_p(h,P_SKIP);

  1225.                     if(!next_mb(h))

  1226.                         goto done;

  1227.                 }

  1228.                 mb_type = get_ue_golomb(&s->gb) + P_16X16;

  1229.             } else

  1230.                 mb_type = get_ue_golomb(&s->gb) + P_SKIP;

  1231.             if(mb_type > P_8X8) {

  1232.                 decode_mb_i(h, mb_type - P_8X8 - 1);

  1233.             } else

  1234.                 decode_mb_p(h,mb_type);

  1235.         } while(next_mb(h));

  1236.     } else { /* FF_B_TYPE */

  1237.         do {

  1238.             if(h->skip_mode_flag) {

  1239.                 skip_count = get_ue_golomb(&s->gb);

  1240.                 while(skip_count--) {

  1241.                     decode_mb_b(h,B_SKIP);

  1242.                     if(!next_mb(h))

  1243.                         goto done;

  1244.                 }

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

  1246.             } else

  1247.                 mb_type = get_ue_golomb(&s->gb) + B_SKIP;

  1248.             if(mb_type > B_8X8) {

  1249.                 decode_mb_i(h, mb_type - B_8X8 - 1);

  1250.             } else

  1251.                 decode_mb_b(h,mb_type);

  1252.         } while(next_mb(h));

  1253.     }

  1254.  done:

  1255.     if(h->pic_type != FF_B_TYPE) {

  1256.         if(h->DPB[1].data[0])

  1257.             s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]);

  1258.         memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture));

  1259.         memcpy(&h->DPB[0], &h->picture, sizeof(Picture));

  1260.         memset(&h->picture,0,sizeof(Picture));

  1261.     }

  1262.     return 0;

  1263. }

  1264. 

  1265. /*****************************************************************************

  1266.  *

  1267.  * headers and interface

  1268.  *

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

  1270. 

  1271. /**

  1272.  * some predictions require data from the top-neighbouring macroblock.

  1273.  * this data has to be stored for one complete row of macroblocks

  1274.  * and this storage space is allocated here

  1275.  */

  1276. static void init_top_lines(AVSContext *h) {

  1277.     /* alloc top line of predictors */

  1278.     h->top_qp       = av_malloc( h->mb_width);

  1279.     h->top_mv[0]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1280.     h->top_mv[1]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1281.     h->top_pred_Y   = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));

  1282.     h->top_border_y = av_malloc((h->mb_width+1)*16);

  1283.     h->top_border_u = av_malloc((h->mb_width)*10);

  1284.     h->top_border_v = av_malloc((h->mb_width)*10);

  1285. 

  1286.     /* alloc space for co-located MVs and types */

  1287.     h->col_mv       = av_malloc( h->mb_width*h->mb_height*4*sizeof(vector_t));

  1288.     h->col_type_base = av_malloc(h->mb_width*h->mb_height);

  1289.     h->block        = av_mallocz(64*sizeof(DCTELEM));

  1290. }

  1291. 

  1292. static int decode_seq_header(AVSContext *h) {

  1293.     MpegEncContext *s = &h->s;

  1294.     extern const AVRational ff_frame_rate_tab[];

  1295.     int frame_rate_code;

  1296. 

  1297.     h->profile =         get_bits(&s->gb,8);

  1298.     h->level =           get_bits(&s->gb,8);

  1299.     skip_bits1(&s->gb); //progressive sequence

  1300.     s->width =           get_bits(&s->gb,14);

  1301.     s->height =          get_bits(&s->gb,14);

  1302.     skip_bits(&s->gb,2); //chroma format

  1303.     skip_bits(&s->gb,3); //sample_precision

  1304.     h->aspect_ratio =    get_bits(&s->gb,4);

  1305.     frame_rate_code =    get_bits(&s->gb,4);

  1306.     skip_bits(&s->gb,18);//bit_rate_lower

  1307.     skip_bits1(&s->gb);  //marker_bit

  1308.     skip_bits(&s->gb,12);//bit_rate_upper

  1309.     s->low_delay =       get_bits1(&s->gb);

  1310.     h->mb_width  = (s->width  + 15) >> 4;

  1311.     h->mb_height = (s->height + 15) >> 4;

  1312.     h->s.avctx->time_base.den = ff_frame_rate_tab[frame_rate_code].num;

  1313.     h->s.avctx->time_base.num = ff_frame_rate_tab[frame_rate_code].den;

  1314.     h->s.avctx->width  = s->width;

  1315.     h->s.avctx->height = s->height;

  1316.     if(!h->top_qp)

  1317.         init_top_lines(h);

  1318.     return 0;

  1319. }

  1320. 

  1321. /**

  1322.  * finds the end of the current frame in the bitstream.

  1323.  * @return the position of the first byte of the next frame, or -1

  1324.  */

  1325. int ff_cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) {

  1326.     int pic_found, i;

  1327.     uint32_t state;

  1328. 

  1329.     pic_found= pc->frame_start_found;

  1330.     state= pc->state;

  1331. 

  1332.     i=0;

  1333.     if(!pic_found){

  1334.         for(i=0; i<buf_size; i++){

  1335.             state= (state<<8) | buf[i];

  1336.             if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){

  1337.                 i++;

  1338.                 pic_found=1;

  1339.                 break;

  1340.             }

  1341.         }

  1342.     }

  1343. 

  1344.     if(pic_found){

  1345.         /* EOF considered as end of frame */

  1346.         if (buf_size == 0)

  1347.             return 0;

  1348.         for(; i<buf_size; i++){

  1349.             state= (state<<8) | buf[i];

  1350.             if((state&0xFFFFFF00) == 0x100){

  1351.                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){

  1352.                     pc->frame_start_found=0;

  1353.                     pc->state=-1;

  1354.                     return i-3;

  1355.                 }

  1356.             }

  1357.         }

  1358.     }

  1359.     pc->frame_start_found= pic_found;

  1360.     pc->state= state;

  1361.     return END_NOT_FOUND;

  1362. }

  1363. 

  1364. void ff_cavs_flush(AVCodecContext * avctx) {

  1365.     AVSContext *h = avctx->priv_data;

  1366.     h->got_keyframe = 0;

  1367. }

  1368. 

  1369. static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size,

  1370.                              uint8_t * buf, int buf_size) {

  1371.     AVSContext *h = avctx->priv_data;

  1372.     MpegEncContext *s = &h->s;

  1373.     int input_size;

  1374.     const uint8_t *buf_end;

  1375.     const uint8_t *buf_ptr;

  1376.     AVFrame *picture = data;

  1377.     uint32_t stc;

  1378. 

  1379.     s->avctx = avctx;

  1380. 

  1381.     if (buf_size == 0) {

  1382.         if(!s->low_delay && h->DPB[0].data[0]) {

  1383.             *data_size = sizeof(AVPicture);

  1384.             *picture = *(AVFrame *) &h->DPB[0];

  1385.         }

  1386.         return 0;

  1387.     }

  1388. 

  1389.     buf_ptr = buf;

  1390.     buf_end = buf + buf_size;

  1391.     for(;;) {

  1392.         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &stc);

  1393.         if(stc & 0xFFFFFE00)

  1394.             return FFMAX(0, buf_ptr - buf - s->parse_context.last_index);

  1395.         input_size = (buf_end - buf_ptr)*8;

  1396.         switch(stc) {

  1397.         case SEQ_START_CODE:

  1398.             init_get_bits(&s->gb, buf_ptr, input_size);

  1399.             decode_seq_header(h);

  1400.             break;

  1401.         case PIC_I_START_CODE:

  1402.             if(!h->got_keyframe) {

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

  1404.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[0]);

  1405.                 if(h->DPB[1].data[0])

  1406.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[1]);

  1407.                 h->got_keyframe = 1;

  1408.             }

  1409.         case PIC_PB_START_CODE:

  1410.             *data_size = 0;

  1411.             if(!h->got_keyframe)

  1412.                 break;

  1413.             init_get_bits(&s->gb, buf_ptr, input_size);

  1414.             h->stc = stc;

  1415.             if(decode_pic(h))

  1416.                 break;

  1417.             *data_size = sizeof(AVPicture);

  1418.             if(h->pic_type != FF_B_TYPE) {

  1419.                 if(h->DPB[1].data[0]) {

  1420.                     *picture = *(AVFrame *) &h->DPB[1];

  1421.                 } else {

  1422.                     *data_size = 0;

  1423.                 }

  1424.             } else

  1425.                 *picture = *(AVFrame *) &h->picture;

  1426.             break;

  1427.         case EXT_START_CODE:

  1428.             //mpeg_decode_extension(avctx,buf_ptr, input_size);

  1429.             break;

  1430.         case USER_START_CODE:

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

  1432.             break;

  1433.         default:

  1434.             if (stc >= SLICE_MIN_START_CODE &&

  1435.                 stc <= SLICE_MAX_START_CODE) {

  1436.                 init_get_bits(&s->gb, buf_ptr, input_size);

  1437.                 decode_slice_header(h, &s->gb);

  1438.             }

  1439.             break;

  1440.         }

  1441.     }

  1442. }

  1443. 

  1444. static int cavs_decode_init(AVCodecContext * avctx) {

  1445.     AVSContext *h = avctx->priv_data;

  1446.     MpegEncContext * const s = &h->s;

  1447. 

  1448.     MPV_decode_defaults(s);

  1449.     s->avctx = avctx;

  1450. 

  1451.     avctx->pix_fmt= PIX_FMT_YUV420P;

  1452. 

  1453.     h->luma_scan[0] = 0;

  1454.     h->luma_scan[1] = 8;

  1455.     h->intra_pred_l[      INTRA_L_VERT] = intra_pred_vert;

  1456.     h->intra_pred_l[     INTRA_L_HORIZ] = intra_pred_horiz;

  1457.     h->intra_pred_l[        INTRA_L_LP] = intra_pred_lp;

  1458.     h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;

  1459.     h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;

  1460.     h->intra_pred_l[   INTRA_L_LP_LEFT] = intra_pred_lp_left;

  1461.     h->intra_pred_l[    INTRA_L_LP_TOP] = intra_pred_lp_top;

  1462.     h->intra_pred_l[    INTRA_L_DC_128] = intra_pred_dc_128;

  1463.     h->intra_pred_c[        INTRA_C_LP] = intra_pred_lp;

  1464.     h->intra_pred_c[     INTRA_C_HORIZ] = intra_pred_horiz;

  1465.     h->intra_pred_c[      INTRA_C_VERT] = intra_pred_vert;

  1466.     h->intra_pred_c[     INTRA_C_PLANE] = intra_pred_plane;

  1467.     h->intra_pred_c[   INTRA_C_LP_LEFT] = intra_pred_lp_left;

  1468.     h->intra_pred_c[    INTRA_C_LP_TOP] = intra_pred_lp_top;

  1469.     h->intra_pred_c[    INTRA_C_DC_128] = intra_pred_dc_128;

  1470.     h->mv[ 7] = un_mv;

  1471.     h->mv[19] = un_mv;

  1472.     return 0;

  1473. }

  1474. 

  1475. static int cavs_decode_end(AVCodecContext * avctx) {

  1476.     AVSContext *h = avctx->priv_data;

  1477. 

  1478.     av_free(h->top_qp);

  1479.     av_free(h->top_mv[0]);

  1480.     av_free(h->top_mv[1]);

  1481.     av_free(h->top_pred_Y);

  1482.     av_free(h->top_border_y);

  1483.     av_free(h->top_border_u);

  1484.     av_free(h->top_border_v);

  1485.     av_free(h->col_mv);

  1486.     av_free(h->col_type_base);

  1487.     av_free(h->block);

  1488.     return 0;

  1489. }

  1490. 

  1491. AVCodec cavs_decoder = {

  1492.     "cavs",

  1493.     CODEC_TYPE_VIDEO,

  1494.     CODEC_ID_CAVS,

  1495.     sizeof(AVSContext),

  1496.     cavs_decode_init,

  1497.     NULL,

  1498.     cavs_decode_end,

  1499.     cavs_decode_frame,

  1500.     CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1501.     .flush= ff_cavs_flush,

  1502. };