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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. #ifdef CONFIG_CAVS_DECODER

  35. typedef struct {

  36.     MpegEncContext s;

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

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

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

  40.     int profile, level;

  41.     int aspect_ratio;

  42.     int mb_width, mb_height;

  43.     int pic_type;

  44.     int progressive;

  45.     int pic_structure;

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

  47.     int loop_filter_disable;

  48.     int alpha_offset, beta_offset;

  49.     int ref_flag;

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

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

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

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

  54.     int left_qp;

  55.     uint8_t *top_qp;

  56. 

  57.     /** mv motion vector cache

  58.        0:    D3  B2  B3  C2

  59.        4:    A1  X0  X1   -

  60.        8:    A3  X2  X3   -

  61. 

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

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

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

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

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

  67. 

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

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

  70.     vector_t *top_mv[2];

  71.     vector_t *col_mv;

  72. 

  73.     /** luma pred mode cache

  74.        0:    --  B2  B3

  75.        3:    A1  X0  X1

  76.        6:    A3  X2  X3   */

  77.     int pred_mode_Y[3*3];

  78.     int *top_pred_Y;

  79.     int l_stride, c_stride;

  80.     int luma_scan[4];

  81.     int qp;

  82.     int qp_fixed;

  83.     int cbp;

  84.     ScanTable scantable;

  85. 

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

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

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

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

  90.     uint8_t intern_border_y[26];

  91.     uint8_t topleft_border_y, topleft_border_u, topleft_border_v;

  92. 

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

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

  95.     uint8_t *col_type_base;

  96.     uint8_t *col_type;

  97. 

  98.     /* scaling factors for MV prediction */

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

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

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

  102. 

  103.     int got_keyframe;

  104.     DCTELEM *block;

  105. } AVSContext;

  106. 

  107. /*****************************************************************************

  108.  *

  109.  * in-loop deblocking filter

  110.  *

  111.  ****************************************************************************/

  112. 

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

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

  115.         return 2;

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

  117.         return 1;

  118.     if(b){

  119.         mvP += MV_BWD_OFFS;

  120.         mvQ += MV_BWD_OFFS;

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

  122.             return 1;

  123.     }else{

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

  125.             return 1;

  126.     }

  127.     return 0;

  128. }

  129. 

  130. #define SET_PARAMS                                            \

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

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

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

  134. 

  135. /**

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

  137.  *

  138.  * boundary strength (bs) mapping:

  139.  *

  140.  * --4---5--

  141.  * 0   2   |

  142.  * | 6 | 7 |

  143.  * 1   3   |

  144.  * ---------

  145.  *

  146.  */

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

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

  149.     int qp_avg, alpha, beta, tc;

  150.     int i;

  151. 

  152.     /* save un-deblocked lines */

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

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

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

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

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

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

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

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

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

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

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

  164.     }

  165.     if(!h->loop_filter_disable) {

  166.         /* determine bs */

  167.         if(mb_type == I_8X8)

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

  169.         else{

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

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

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

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

  174.             }

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

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

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

  178.             }

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

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

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

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

  183.         }

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

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

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

  187.                 SET_PARAMS;

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

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

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

  191.             }

  192.             qp_avg = h->qp;

  193.             SET_PARAMS;

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

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

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

  197. 

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

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

  200.                 SET_PARAMS;

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

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

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

  204.             }

  205.         }

  206.     }

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

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

  209. }

  210. 

  211. #undef SET_PARAMS

  212. 

  213. /*****************************************************************************

  214.  *

  215.  * spatial intra prediction

  216.  *

  217.  ****************************************************************************/

  218. 

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

  220.                                         uint8_t **left, int block) {

  221.     int i;

  222. 

  223.     switch(block) {

  224.     case 0:

  225.         *left = h->left_border_y;

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

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

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

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

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

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

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

  233.         break;

  234.     case 1:

  235.         *left = h->intern_border_y;

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

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

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

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

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

  241.         if(h->flags & C_AVAIL)

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

  243.         else

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

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

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

  247.         if(h->flags & B_AVAIL)

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

  249.         break;

  250.     case 2:

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

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

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

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

  255.         if(h->flags & A_AVAIL)

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

  257.         break;

  258.     case 3:

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

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

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

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

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

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

  265.         break;

  266.     }

  267. }

  268. 

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

  270.     int y;

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

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

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

  274.     }

  275. }

  276. 

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

  278.     int y;

  279.     uint64_t a;

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

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

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

  283.     }

  284. }

  285. 

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

  287.     int y;

  288.     uint64_t a = 0x8080808080808080ULL;

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

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

  291. }

  292. 

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

  294.     int x,y,ia;

  295.     int ih = 0;

  296.     int iv = 0;

  297.     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  298. 

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

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

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

  302.     }

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

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

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

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

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

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

  309. }

  310. 

  311. #define LOWPASS(ARRAY,INDEX)                                            \

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

  313. 

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

  315.     int x,y;

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

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

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

  319. }

  320. 

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

  322.     int x,y;

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

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

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

  326. }

  327. 

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

  329.     int x,y;

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

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

  332.             if(x==y)

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

  334.             else if(x>y)

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

  336.             else

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

  338. }

  339. 

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

  341.     int x,y;

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

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

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

  345. }

  346. 

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

  348.     int x,y;

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

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

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

  352. }

  353. 

  354. #undef LOWPASS

  355. 

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

  357.     *mode = mod_table[*mode];

  358.     if(*mode < 0) {

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

  360.         *mode = 0;

  361.     }

  362. }

  363. 

  364. /*****************************************************************************

  365.  *

  366.  * motion compensation

  367.  *

  368.  ****************************************************************************/

  369. 

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

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

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

  373.                         int src_y_offset,qpel_mc_func *qpix_op,

  374.                         h264_chroma_mc_func chroma_op,vector_t *mv){

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

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

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

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

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

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

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

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

  383.     int extra_height= extra_width;

  384.     int emu=0;

  385.     const int full_mx= mx>>2;

  386.     const int full_my= my>>2;

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

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

  389. 

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

  391.         return;

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

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

  394. 

  395.     if(   full_mx < 0-extra_width

  396.           || full_my < 0-extra_height

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

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

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

  400.                             16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);

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

  402.         emu=1;

  403.     }

  404. 

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

  406.     if(!square){

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

  408.     }

  409. 

  410.     if(emu){

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

  412.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  413.         src_cb= s->edge_emu_buffer;

  414.     }

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

  416. 

  417.     if(emu){

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

  419.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  420.         src_cr= s->edge_emu_buffer;

  421.     }

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

  423. }

  424. 

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

  426.                         uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,

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

  428.                         h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,

  429.                         h264_chroma_mc_func chroma_avg, vector_t *mv){

  430.     qpel_mc_func *qpix_op=  qpix_put;

  431.     h264_chroma_mc_func chroma_op= chroma_put;

  432. 

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

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

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

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

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

  438. 

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

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

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

  442.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  443.                     qpix_op, chroma_op, mv);

  444. 

  445.         qpix_op=  qpix_avg;

  446.         chroma_op= chroma_avg;

  447.     }

  448. 

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

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

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

  452.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  453.                     qpix_op, chroma_op, mv+MV_BWD_OFFS);

  454.     }

  455. }

  456. 

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

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

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

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

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

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

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

  464.     }else{

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  485.     }

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

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

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

  489. }

  490. 

  491. /*****************************************************************************

  492.  *

  493.  * motion vector prediction

  494.  *

  495.  ****************************************************************************/

  496. 

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

  498.     switch(size) {

  499.     case BLK_16X16:

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

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

  502.     case BLK_16X8:

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

  504.         break;

  505.     case BLK_8X16:

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

  507.         break;

  508.     }

  509. }

  510. 

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

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

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

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

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

  516. }

  517. 

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

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

  520. 

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

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

  523. }

  524. 

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

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

  527.     int len_ab, len_bc, len_ca, len_mid;

  528. 

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

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

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

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

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

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

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

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

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

  538.     if(len_mid == len_ab) {

  539.         mvP->x = cx;

  540.         mvP->y = cy;

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

  542.         mvP->x = ax;

  543.         mvP->y = ay;

  544.     } else {

  545.         mvP->x = bx;

  546.         mvP->y = by;

  547.     }

  548. }

  549. 

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

  551.                                   vector_t *col_mv) {

  552.     vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS;

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

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

  555. 

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

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

  558.     pmv_fw->ref = 1;

  559.     pmv_bw->ref = 0;

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

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

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

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

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

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

  566. }

  567. 

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

  569.     vector_t *dst = src + MV_BWD_OFFS;

  570. 

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

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

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

  574.     dst->ref = 0;

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

  576.     set_mvs(dst, size);

  577. }

  578. 

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

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

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

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

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

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

  585.     const vector_t *mvP2 = NULL;

  586. 

  587.     mvP->ref = ref;

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

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

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

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

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

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

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

  595.         mvP2 = &un_mv;

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

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

  598.         mvP2= mvA;

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

  600.         mvP2= mvB;

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

  602.         mvP2= mvC;

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

  604.         mvP2= mvA;

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

  606.         mvP2= mvB;

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

  608.         mvP2= mvC;

  609.     }

  610.     if(mvP2){

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

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

  613.     }else

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

  615. 

  616.     if(mode < MV_PRED_PSKIP) {

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

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

  619.     }

  620.     set_mvs(mvP,size);

  621. }

  622. 

  623. /*****************************************************************************

  624.  *

  625.  * residual data decoding

  626.  *

  627.  ****************************************************************************/

  628. 

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

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

  631.     if(order) {

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

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

  634.     }

  635.     return get_ue_golomb(gb);

  636. }

  637. 

  638. /**

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

  640.  *  and add them to sample block

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

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

  643.  * @param qp quantizer

  644.  * @param dst location of sample block

  645.  * @param stride line stride in frame buffer

  646.  */

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

  648.                                  const residual_vlc_t *r, int esc_golomb_order,

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

  650.     int i,pos = -1;

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

  652.     int level_buf[64];

  653.     int run_buf[64];

  654.     int dqm = dequant_mul[qp];

  655.     int dqs = dequant_shift[qp];

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

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

  658.     DCTELEM *block = h->block;

  659. 

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

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

  662.         if(level_code >= ESCAPE_CODE) {

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

  664.             esc_code = get_ue_code(gb,esc_golomb_order);

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

  666.             while(level > r->inc_limit)

  667.                 r++;

  668.             mask = -(level_code & 1);

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

  670.         } else {

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

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

  673.                 break;

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

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

  676.         }

  677.         level_buf[i] = level;

  678.         run_buf[i] = run;

  679.     }

  680.     /* inverse scan and dequantization */

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

  682.         pos += run_buf[i];

  683.         if(pos > 63) {

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

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

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

  687.             return -1;

  688.         }

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

  690.     }

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

  692.     return 0;

  693. }

  694. 

  695. 

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

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

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

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

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

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

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

  703. }

  704. 

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

  706.     int block;

  707. 

  708.     /* get coded block pattern */

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

  710.     if(cbp > 63){

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

  712.         return -1;

  713.     }

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

  715. 

  716.     /* get quantizer */

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

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

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

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

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

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

  723.     decode_residual_chroma(h);

  724. 

  725.     return 0;

  726. }

  727. 

  728. /*****************************************************************************

  729.  *

  730.  * macroblock level

  731.  *

  732.  ****************************************************************************/

  733. 

  734. /**

  735.  * initialise predictors for motion vectors and intra prediction

  736.  */

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

  738.     int i;

  739. 

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

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

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

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

  744.     }

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

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

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

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

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

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

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

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

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

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

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

  756.         h->flags |= D_AVAIL;

  757.     }

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

  759.         h->flags &= ~C_AVAIL;

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

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

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

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

  764.     }

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

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

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

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

  769.     }

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

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

  772. }

  773. 

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

  775. 

  776. /**

  777.  * save predictors for later macroblocks and increase

  778.  * macroblock address

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

  780.  */

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

  782.     int i;

  783. 

  784.     h->flags |= A_AVAIL;

  785.     h->cy += 16;

  786.     h->cu += 8;

  787.     h->cv += 8;

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

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

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

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

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

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

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

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

  796.     /* next MB address */

  797.     h->mbx++;

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

  799.         h->flags = B_AVAIL|C_AVAIL;

  800.         /* clear left pred_modes */

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

  802.         /* clear left mv predictors */

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

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

  805.         h->mbx = 0;

  806.         h->mby++;

  807.         /* re-calculate sample pointers */

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

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

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

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

  812.             return 0;

  813.         } else {

  814.             //check_for_slice(h);

  815.         }

  816.     }

  817.     return 1;

  818. }

  819. 

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

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

  822.     int block, pred_mode_uv;

  823.     uint8_t top[18];

  824.     uint8_t *left = NULL;

  825.     uint8_t *d;

  826. 

  827.     init_mb(h);

  828. 

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

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

  831.         int nA,nB,predpred;

  832.         int pos = scan3x3[block];

  833. 

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

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

  836.         predpred = FFMIN(nA,nB);

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

  838.             predpred = INTRA_L_LP;

  839.         if(!get_bits1(gb)){

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

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

  842.         }

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

  844.     }

  845.     pred_mode_uv = get_ue_golomb(gb);

  846.     if(pred_mode_uv > 6) {

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

  848.         return -1;

  849.     }

  850. 

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

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

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

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

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

  856. 

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

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

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

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

  861.         modify_pred(left_modifier_c, &pred_mode_uv );

  862.     }

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

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

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

  866.         modify_pred(top_modifier_c, &pred_mode_uv );

  867.     }

  868. 

  869.     /* get coded block pattern */

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

  871.         cbp_code = get_ue_golomb(gb);

  872.     if(cbp_code > 63){

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

  874.         return -1;

  875.     }

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

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

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

  879. 

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

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

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

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

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

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

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

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

  888.     }

  889. 

  890.     /* chroma intra prediction */

  891.     /* extend borders by one pixel */

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

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

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

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

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

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

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

  899.     } else {

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

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

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

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

  904.     }

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

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

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

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

  909. 

  910.     decode_residual_chroma(h);

  911.     filter_mb(h,I_8X8);

  912. 

  913.     /* mark motion vectors as intra */

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

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

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

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

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

  919.         *h->col_type = I_8X8;

  920. 

  921.     return 0;

  922. }

  923. 

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

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

  926.     int ref[4];

  927. 

  928.     init_mb(h);

  929.     switch(mb_type) {

  930.     case P_SKIP:

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

  932.         break;

  933.     case P_16X16:

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

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

  936.         break;

  937.     case P_16X8:

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

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

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

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

  942.         break;

  943.     case P_8X16:

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

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

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

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

  948.         break;

  949.     case P_8X8:

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

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

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

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

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

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

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

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

  958.     }

  959.     inter_pred(h, mb_type);

  960.     store_mvs(h);

  961.     if(mb_type != P_SKIP)

  962.         decode_residual_inter(h);

  963.     filter_mb(h,mb_type);

  964.     *h->col_type = mb_type;

  965. }

  966. 

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

  968.     int block;

  969.     enum sub_mb_t sub_type[4];

  970.     int flags;

  971. 

  972.     init_mb(h);

  973. 

  974.     /* reset all MVs */

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

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

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

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

  979.     switch(mb_type) {

  980.     case B_SKIP:

  981.     case B_DIRECT:

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

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

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

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

  986.         } else

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

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

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

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

  991.         break;

  992.     case B_FWD_16X16:

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

  994.         break;

  995.     case B_SYM_16X16:

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

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

  998.         break;

  999.     case B_BWD_16X16:

  1000.         mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);

  1001.         break;

  1002.     case B_8X8:

  1003.         for(block=0;block<4;block++)

  1004.             sub_type[block] = get_bits(&h->s.gb,2);

  1005.         for(block=0;block<4;block++) {

  1006.             switch(sub_type[block]) {

  1007.             case B_SUB_DIRECT:

  1008.                 if(!(*h->col_type)) {

  1009.                     /* intra MB at co-location, do in-plane prediction */

  1010.                     mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1011.                             MV_PRED_BSKIP, BLK_8X8, 1);

  1012.                     mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1013.                             mv_scan[block]-3+MV_BWD_OFFS,

  1014.                             MV_PRED_BSKIP, BLK_8X8, 0);

  1015.                 } else

  1016.                     mv_pred_direct(h,&h->mv[mv_scan[block]],

  1017.                                    &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);

  1018.                 break;

  1019.             case B_SUB_FWD:

  1020.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1021.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1022.                 break;

  1023.             case B_SUB_SYM:

  1024.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1025.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1026.                 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);

  1027.                 break;

  1028.             }

  1029.         }

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

  1031.             if(sub_type[block] == B_SUB_BWD)

  1032.                 mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1033.                         mv_scan[block]+MV_BWD_OFFS-3,

  1034.                         MV_PRED_MEDIAN, BLK_8X8, 0);

  1035.         }

  1036.         break;

  1037.     default:

  1038.         assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));

  1039.         flags = partition_flags[mb_type];

  1040.         if(mb_type & 1) { /* 16x8 macroblock types */

  1041.             if(flags & FWD0)

  1042.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1043.             if(flags & SYM0)

  1044.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);

  1045.             if(flags & FWD1)

  1046.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1047.             if(flags & SYM1)

  1048.                 mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);

  1049.             if(flags & BWD0)

  1050.                 mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP,  BLK_16X8, 0);

  1051.             if(flags & BWD1)

  1052.                 mv_pred(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);

  1053.         } else {          /* 8x16 macroblock types */

  1054.             if(flags & FWD0)

  1055.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1056.             if(flags & SYM0)

  1057.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);

  1058.             if(flags & FWD1)

  1059.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1060.             if(flags & SYM1)

  1061.                 mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);

  1062.             if(flags & BWD0)

  1063.                 mv_pred(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);

  1064.             if(flags & BWD1)

  1065.                 mv_pred(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 0);

  1066.         }

  1067.     }

  1068.     inter_pred(h, mb_type);

  1069.     if(mb_type != B_SKIP)

  1070.         decode_residual_inter(h);

  1071.     filter_mb(h,mb_type);

  1072. }

  1073. 

  1074. /*****************************************************************************

  1075.  *

  1076.  * slice level

  1077.  *

  1078.  ****************************************************************************/

  1079. 

  1080. static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {

  1081.     if(h->stc > 0xAF)

  1082.         av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);

  1083.     h->mby = h->stc;

  1084.     if((h->mby == 0) && (!h->qp_fixed)){

  1085.         h->qp_fixed = get_bits1(gb);

  1086.         h->qp = get_bits(gb,6);

  1087.     }

  1088.     /* inter frame or second slice can have weighting params */

  1089.     if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2))

  1090.         if(get_bits1(gb)) { //slice_weighting_flag

  1091.             av_log(h->s.avctx, AV_LOG_ERROR,

  1092.                    "weighted prediction not yet supported\n");

  1093.         }

  1094.     return 0;

  1095. }

  1096. 

  1097. static inline void check_for_slice(AVSContext *h) {

  1098.     GetBitContext *gb = &h->s.gb;

  1099.     int align;

  1100.     align = (-get_bits_count(gb)) & 7;

  1101.     if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {

  1102.         get_bits_long(gb,24+align);

  1103.         h->stc = get_bits(gb,8);

  1104.         decode_slice_header(h,gb);

  1105.     }

  1106. }

  1107. 

  1108. /*****************************************************************************

  1109.  *

  1110.  * frame level

  1111.  *

  1112.  ****************************************************************************/

  1113. 

  1114. static void init_pic(AVSContext *h) {

  1115.     int i;

  1116. 

  1117.     /* clear some predictors */

  1118.     for(i=0;i<=20;i+=4)

  1119.         h->mv[i] = un_mv;

  1120.     h->mv[MV_BWD_X0] = dir_mv;

  1121.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1122.     h->mv[MV_FWD_X0] = dir_mv;

  1123.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1124.     h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;

  1125.     h->cy = h->picture.data[0];

  1126.     h->cu = h->picture.data[1];

  1127.     h->cv = h->picture.data[2];

  1128.     h->l_stride = h->picture.linesize[0];

  1129.     h->c_stride = h->picture.linesize[1];

  1130.     h->luma_scan[2] = 8*h->l_stride;

  1131.     h->luma_scan[3] = 8*h->l_stride+8;

  1132.     h->mbx = h->mby = 0;

  1133.     h->flags = 0;

  1134. }

  1135. 

  1136. static int decode_pic(AVSContext *h) {

  1137.     MpegEncContext *s = &h->s;

  1138.     int skip_count;

  1139.     enum mb_t mb_type;

  1140. 

  1141.     if (!s->context_initialized) {

  1142.         s->avctx->idct_algo = FF_IDCT_CAVS;

  1143.         if (MPV_common_init(s) < 0)

  1144.             return -1;

  1145.         ff_init_scantable(s->dsp.idct_permutation,&h->scantable,ff_zigzag_direct);

  1146.     }

  1147.     get_bits(&s->gb,16);//bbv_dwlay

  1148.     if(h->stc == PIC_PB_START_CODE) {

  1149.         h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE;

  1150.         if(h->pic_type > FF_B_TYPE) {

  1151.             av_log(s->avctx, AV_LOG_ERROR, "illegal picture type\n");

  1152.             return -1;

  1153.         }

  1154.         /* make sure we have the reference frames we need */

  1155.         if(!h->DPB[0].data[0] ||

  1156.           (!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE))

  1157.             return -1;

  1158.     } else {

  1159.         h->pic_type = FF_I_TYPE;

  1160.         if(get_bits1(&s->gb))

  1161.             get_bits(&s->gb,16);//time_code

  1162.     }

  1163.     /* release last B frame */

  1164.     if(h->picture.data[0])

  1165.         s->avctx->release_buffer(s->avctx, (AVFrame *)&h->picture);

  1166. 

  1167.     s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture);

  1168.     init_pic(h);

  1169.     h->picture.poc = get_bits(&s->gb,8)*2;

  1170. 

  1171.     /* get temporal distances and MV scaling factors */

  1172.     if(h->pic_type != FF_B_TYPE) {

  1173.         h->dist[0] = (h->picture.poc - h->DPB[0].poc  + 512) % 512;

  1174.     } else {

  1175.         h->dist[0] = (h->DPB[0].poc  - h->picture.poc + 512) % 512;

  1176.     }

  1177.     h->dist[1] = (h->picture.poc - h->DPB[1].poc  + 512) % 512;

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

  1179.     h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;

  1180.     if(h->pic_type == FF_B_TYPE) {

  1181.         h->sym_factor = h->dist[0]*h->scale_den[1];

  1182.     } else {

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

  1184.         h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0;

  1185.     }

  1186. 

  1187.     if(s->low_delay)

  1188.         get_ue_golomb(&s->gb); //bbv_check_times

  1189.     h->progressive             = get_bits1(&s->gb);

  1190.     if(h->progressive)

  1191.         h->pic_structure = 1;

  1192.     else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) )

  1193.         get_bits1(&s->gb);     //advanced_pred_mode_disable

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

  1195.     skip_bits1(&s->gb);        //repeat_first_field

  1196.     h->qp_fixed                = get_bits1(&s->gb);

  1197.     h->qp                      = get_bits(&s->gb,6);

  1198.     if(h->pic_type == FF_I_TYPE) {

  1199.         if(!h->progressive && !h->pic_structure)

  1200.             skip_bits1(&s->gb);//what is this?

  1201.         skip_bits(&s->gb,4);   //reserved bits

  1202.     } else {

  1203.         if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1))

  1204.             h->ref_flag        = get_bits1(&s->gb);

  1205.         skip_bits(&s->gb,4);   //reserved bits

  1206.         h->skip_mode_flag      = get_bits1(&s->gb);

  1207.     }

  1208.     h->loop_filter_disable     = get_bits1(&s->gb);

  1209.     if(!h->loop_filter_disable && get_bits1(&s->gb)) {

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

  1211.         h->beta_offset         = get_se_golomb(&s->gb);

  1212.     } else {

  1213.         h->alpha_offset = h->beta_offset  = 0;

  1214.     }

  1215.     check_for_slice(h);

  1216.     if(h->pic_type == FF_I_TYPE) {

  1217.         do {

  1218.             decode_mb_i(h, 0);

  1219.         } while(next_mb(h));

  1220.     } else if(h->pic_type == FF_P_TYPE) {

  1221.         do {

  1222.             if(h->skip_mode_flag) {

  1223.                 skip_count = get_ue_golomb(&s->gb);

  1224.                 while(skip_count--) {

  1225.                     decode_mb_p(h,P_SKIP);

  1226.                     if(!next_mb(h))

  1227.                         goto done;

  1228.                 }

  1229.                 mb_type = get_ue_golomb(&s->gb) + P_16X16;

  1230.             } else

  1231.                 mb_type = get_ue_golomb(&s->gb) + P_SKIP;

  1232.             if(mb_type > P_8X8) {

  1233.                 decode_mb_i(h, mb_type - P_8X8 - 1);

  1234.             } else

  1235.                 decode_mb_p(h,mb_type);

  1236.         } while(next_mb(h));

  1237.     } else { /* FF_B_TYPE */

  1238.         do {

  1239.             if(h->skip_mode_flag) {

  1240.                 skip_count = get_ue_golomb(&s->gb);

  1241.                 while(skip_count--) {

  1242.                     decode_mb_b(h,B_SKIP);

  1243.                     if(!next_mb(h))

  1244.                         goto done;

  1245.                 }

  1246.                 mb_type = get_ue_golomb(&s->gb) + B_DIRECT;

  1247.             } else

  1248.                 mb_type = get_ue_golomb(&s->gb) + B_SKIP;

  1249.             if(mb_type > B_8X8) {

  1250.                 decode_mb_i(h, mb_type - B_8X8 - 1);

  1251.             } else

  1252.                 decode_mb_b(h,mb_type);

  1253.         } while(next_mb(h));

  1254.     }

  1255.  done:

  1256.     if(h->pic_type != FF_B_TYPE) {

  1257.         if(h->DPB[1].data[0])

  1258.             s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]);

  1259.         memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture));

  1260.         memcpy(&h->DPB[0], &h->picture, sizeof(Picture));

  1261.         memset(&h->picture,0,sizeof(Picture));

  1262.     }

  1263.     return 0;

  1264. }

  1265. 

  1266. /*****************************************************************************

  1267.  *

  1268.  * headers and interface

  1269.  *

  1270.  ****************************************************************************/

  1271. 

  1272. /**

  1273.  * some predictions require data from the top-neighbouring macroblock.

  1274.  * this data has to be stored for one complete row of macroblocks

  1275.  * and this storage space is allocated here

  1276.  */

  1277. static void init_top_lines(AVSContext *h) {

  1278.     /* alloc top line of predictors */

  1279.     h->top_qp       = av_malloc( h->mb_width);

  1280.     h->top_mv[0]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1281.     h->top_mv[1]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1282.     h->top_pred_Y   = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));

  1283.     h->top_border_y = av_malloc((h->mb_width+1)*16);

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

  1285.     h->top_border_v = av_malloc((h->mb_width)*10);

  1286. 

  1287.     /* alloc space for co-located MVs and types */

  1288.     h->col_mv       = av_malloc( h->mb_width*h->mb_height*4*sizeof(vector_t));

  1289.     h->col_type_base = av_malloc(h->mb_width*h->mb_height);

  1290.     h->block        = av_mallocz(64*sizeof(DCTELEM));

  1291. }

  1292. 

  1293. static int decode_seq_header(AVSContext *h) {

  1294.     MpegEncContext *s = &h->s;

  1295.     extern const AVRational ff_frame_rate_tab[];

  1296.     int frame_rate_code;

  1297. 

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

  1299.     h->level =           get_bits(&s->gb,8);

  1300.     skip_bits1(&s->gb); //progressive sequence

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

  1302.     s->height =          get_bits(&s->gb,14);

  1303.     skip_bits(&s->gb,2); //chroma format

  1304.     skip_bits(&s->gb,3); //sample_precision

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

  1306.     frame_rate_code =    get_bits(&s->gb,4);

  1307.     skip_bits(&s->gb,18);//bit_rate_lower

  1308.     skip_bits1(&s->gb);  //marker_bit

  1309.     skip_bits(&s->gb,12);//bit_rate_upper

  1310.     s->low_delay =       get_bits1(&s->gb);

  1311.     h->mb_width  = (s->width  + 15) >> 4;

  1312.     h->mb_height = (s->height + 15) >> 4;

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

  1314.     h->s.avctx->time_base.num = ff_frame_rate_tab[frame_rate_code].den;

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

  1316.     h->s.avctx->height = s->height;

  1317.     if(!h->top_qp)

  1318.         init_top_lines(h);

  1319.     return 0;

  1320. }

  1321. 

  1322. static void cavs_flush(AVCodecContext * avctx) {

  1323.     AVSContext *h = avctx->priv_data;

  1324.     h->got_keyframe = 0;

  1325. }

  1326. 

  1327. static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size,

  1328.                              uint8_t * buf, int buf_size) {

  1329.     AVSContext *h = avctx->priv_data;

  1330.     MpegEncContext *s = &h->s;

  1331.     int input_size;

  1332.     const uint8_t *buf_end;

  1333.     const uint8_t *buf_ptr;

  1334.     AVFrame *picture = data;

  1335.     uint32_t stc;

  1336. 

  1337.     s->avctx = avctx;

  1338. 

  1339.     if (buf_size == 0) {

  1340.         if(!s->low_delay && h->DPB[0].data[0]) {

  1341.             *data_size = sizeof(AVPicture);

  1342.             *picture = *(AVFrame *) &h->DPB[0];

  1343.         }

  1344.         return 0;

  1345.     }

  1346. 

  1347.     buf_ptr = buf;

  1348.     buf_end = buf + buf_size;

  1349.     for(;;) {

  1350.         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &stc);

  1351.         if(stc & 0xFFFFFE00)

  1352.             return FFMAX(0, buf_ptr - buf - s->parse_context.last_index);

  1353.         input_size = (buf_end - buf_ptr)*8;

  1354.         switch(stc) {

  1355.         case SEQ_START_CODE:

  1356.             init_get_bits(&s->gb, buf_ptr, input_size);

  1357.             decode_seq_header(h);

  1358.             break;

  1359.         case PIC_I_START_CODE:

  1360.             if(!h->got_keyframe) {

  1361.                 if(h->DPB[0].data[0])

  1362.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[0]);

  1363.                 if(h->DPB[1].data[0])

  1364.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[1]);

  1365.                 h->got_keyframe = 1;

  1366.             }

  1367.         case PIC_PB_START_CODE:

  1368.             *data_size = 0;

  1369.             if(!h->got_keyframe)

  1370.                 break;

  1371.             init_get_bits(&s->gb, buf_ptr, input_size);

  1372.             h->stc = stc;

  1373.             if(decode_pic(h))

  1374.                 break;

  1375.             *data_size = sizeof(AVPicture);

  1376.             if(h->pic_type != FF_B_TYPE) {

  1377.                 if(h->DPB[1].data[0]) {

  1378.                     *picture = *(AVFrame *) &h->DPB[1];

  1379.                 } else {

  1380.                     *data_size = 0;

  1381.                 }

  1382.             } else

  1383.                 *picture = *(AVFrame *) &h->picture;

  1384.             break;

  1385.         case EXT_START_CODE:

  1386.             //mpeg_decode_extension(avctx,buf_ptr, input_size);

  1387.             break;

  1388.         case USER_START_CODE:

  1389.             //mpeg_decode_user_data(avctx,buf_ptr, input_size);

  1390.             break;

  1391.         default:

  1392.             if (stc >= SLICE_MIN_START_CODE &&

  1393.                 stc <= SLICE_MAX_START_CODE) {

  1394.                 init_get_bits(&s->gb, buf_ptr, input_size);

  1395.                 decode_slice_header(h, &s->gb);

  1396.             }

  1397.             break;

  1398.         }

  1399.     }

  1400. }

  1401. 

  1402. static int cavs_decode_init(AVCodecContext * avctx) {

  1403.     AVSContext *h = avctx->priv_data;

  1404.     MpegEncContext * const s = &h->s;

  1405. 

  1406.     MPV_decode_defaults(s);

  1407.     s->avctx = avctx;

  1408. 

  1409.     avctx->pix_fmt= PIX_FMT_YUV420P;

  1410. 

  1411.     h->luma_scan[0] = 0;

  1412.     h->luma_scan[1] = 8;

  1413.     h->intra_pred_l[      INTRA_L_VERT] = intra_pred_vert;

  1414.     h->intra_pred_l[     INTRA_L_HORIZ] = intra_pred_horiz;

  1415.     h->intra_pred_l[        INTRA_L_LP] = intra_pred_lp;

  1416.     h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;

  1417.     h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;

  1418.     h->intra_pred_l[   INTRA_L_LP_LEFT] = intra_pred_lp_left;

  1419.     h->intra_pred_l[    INTRA_L_LP_TOP] = intra_pred_lp_top;

  1420.     h->intra_pred_l[    INTRA_L_DC_128] = intra_pred_dc_128;

  1421.     h->intra_pred_c[        INTRA_C_LP] = intra_pred_lp;

  1422.     h->intra_pred_c[     INTRA_C_HORIZ] = intra_pred_horiz;

  1423.     h->intra_pred_c[      INTRA_C_VERT] = intra_pred_vert;

  1424.     h->intra_pred_c[     INTRA_C_PLANE] = intra_pred_plane;

  1425.     h->intra_pred_c[   INTRA_C_LP_LEFT] = intra_pred_lp_left;

  1426.     h->intra_pred_c[    INTRA_C_LP_TOP] = intra_pred_lp_top;

  1427.     h->intra_pred_c[    INTRA_C_DC_128] = intra_pred_dc_128;

  1428.     h->mv[ 7] = un_mv;

  1429.     h->mv[19] = un_mv;

  1430.     return 0;

  1431. }

  1432. 

  1433. static int cavs_decode_end(AVCodecContext * avctx) {

  1434.     AVSContext *h = avctx->priv_data;

  1435. 

  1436.     av_free(h->top_qp);

  1437.     av_free(h->top_mv[0]);

  1438.     av_free(h->top_mv[1]);

  1439.     av_free(h->top_pred_Y);

  1440.     av_free(h->top_border_y);

  1441.     av_free(h->top_border_u);

  1442.     av_free(h->top_border_v);

  1443.     av_free(h->col_mv);

  1444.     av_free(h->col_type_base);

  1445.     av_free(h->block);

  1446.     return 0;

  1447. }

  1448. 

  1449. AVCodec cavs_decoder = {

  1450.     "cavs",

  1451.     CODEC_TYPE_VIDEO,

  1452.     CODEC_ID_CAVS,

  1453.     sizeof(AVSContext),

  1454.     cavs_decode_init,

  1455.     NULL,

  1456.     cavs_decode_end,

  1457.     cavs_decode_frame,

  1458.     CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1459.     .flush= cavs_flush,

  1460. };

  1461. #endif /* CONFIG_CAVS_DECODER */

  1462. 

  1463. #ifdef CONFIG_CAVSVIDEO_PARSER

  1464. /**

  1465.  * finds the end of the current frame in the bitstream.

  1466.  * @return the position of the first byte of the next frame, or -1

  1467.  */

  1468. static int cavs_find_frame_end(ParseContext *pc, const uint8_t *buf,

  1469.                                int buf_size) {

  1470.     int pic_found, i;

  1471.     uint32_t state;

  1472. 

  1473.     pic_found= pc->frame_start_found;

  1474.     state= pc->state;

  1475. 

  1476.     i=0;

  1477.     if(!pic_found){

  1478.         for(i=0; i<buf_size; i++){

  1479.             state= (state<<8) | buf[i];

  1480.             if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){

  1481.                 i++;

  1482.                 pic_found=1;

  1483.                 break;

  1484.             }

  1485.         }

  1486.     }

  1487. 

  1488.     if(pic_found){

  1489.         /* EOF considered as end of frame */

  1490.         if (buf_size == 0)

  1491.             return 0;

  1492.         for(; i<buf_size; i++){

  1493.             state= (state<<8) | buf[i];

  1494.             if((state&0xFFFFFF00) == 0x100){

  1495.                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){

  1496.                     pc->frame_start_found=0;

  1497.                     pc->state=-1;

  1498.                     return i-3;

  1499.                 }

  1500.             }

  1501.         }

  1502.     }

  1503.     pc->frame_start_found= pic_found;

  1504.     pc->state= state;

  1505.     return END_NOT_FOUND;

  1506. }

  1507. 

  1508. static int cavsvideo_parse(AVCodecParserContext *s,

  1509.                            AVCodecContext *avctx,

  1510.                            uint8_t **poutbuf, int *poutbuf_size,

  1511.                            const uint8_t *buf, int buf_size)

  1512. {

  1513.     ParseContext *pc = s->priv_data;

  1514.     int next;

  1515. 

  1516.     if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){

  1517.         next= buf_size;

  1518.     }else{

  1519.         next= cavs_find_frame_end(pc, buf, buf_size);

  1520. 

  1521.         if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) {

  1522.             *poutbuf = NULL;

  1523.             *poutbuf_size = 0;

  1524.             return buf_size;

  1525.         }

  1526.     }

  1527.     *poutbuf = (uint8_t *)buf;

  1528.     *poutbuf_size = buf_size;

  1529.     return next;

  1530. }

  1531. 

  1532. AVCodecParser cavsvideo_parser = {

  1533.     { CODEC_ID_CAVS },

  1534.     sizeof(ParseContext1),

  1535.     NULL,

  1536.     cavsvideo_parse,

  1537.     ff_parse1_close,

  1538.     ff_mpeg4video_split,

  1539. };

  1540. #endif /* CONFIG_CAVSVIDEO_PARSER */