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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 "cavs.h"

  33. #ifdef CONFIG_CAVS_DECODER

  34. #include "cavsdata.h"

  35. 

  36. typedef struct {

  37.     MpegEncContext s;

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

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

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

  41.     int profile, level;

  42.     int aspect_ratio;

  43.     int mb_width, mb_height;

  44.     int pic_type;

  45.     int progressive;

  46.     int pic_structure;

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

  48.     int loop_filter_disable;

  49.     int alpha_offset, beta_offset;

  50.     int ref_flag;

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

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

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

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

  55.     int left_qp;

  56.     uint8_t *top_qp;

  57. 

  58.     /** mv motion vector cache

  59.        0:    D3  B2  B3  C2

  60.        4:    A1  X0  X1   -

  61.        8:    A3  X2  X3   -

  62. 

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

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

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

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

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

  68. 

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

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

  71.     vector_t *top_mv[2];

  72.     vector_t *col_mv;

  73. 

  74.     /** luma pred mode cache

  75.        0:    --  B2  B3

  76.        3:    A1  X0  X1

  77.        6:    A3  X2  X3   */

  78.     int pred_mode_Y[3*3];

  79.     int *top_pred_Y;

  80.     int l_stride, c_stride;

  81.     int luma_scan[4];

  82.     int qp;

  83.     int qp_fixed;

  84.     int cbp;

  85.     ScanTable scantable;

  86. 

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

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

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

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

  91.     uint8_t intern_border_y[26];

  92.     uint8_t topleft_border_y, topleft_border_u, topleft_border_v;

  93. 

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

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

  96.     uint8_t *col_type_base;

  97.     uint8_t *col_type;

  98. 

  99.     /* scaling factors for MV prediction */

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

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

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

  103. 

  104.     int got_keyframe;

  105.     DCTELEM *block;

  106. } AVSContext;

  107. 

  108. /*****************************************************************************

  109.  *

  110.  * in-loop deblocking filter

  111.  *

  112.  ****************************************************************************/

  113. 

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

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

  116.         return 2;

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

  118.         return 1;

  119.     if(b){

  120.         mvP += MV_BWD_OFFS;

  121.         mvQ += MV_BWD_OFFS;

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

  123.             return 1;

  124.     }else{

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

  126.             return 1;

  127.     }

  128.     return 0;

  129. }

  130. 

  131. #define SET_PARAMS                                            \

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

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

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

  135. 

  136. /**

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

  138.  *

  139.  * boundary strength (bs) mapping:

  140.  *

  141.  * --4---5--

  142.  * 0   2   |

  143.  * | 6 | 7 |

  144.  * 1   3   |

  145.  * ---------

  146.  *

  147.  */

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

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

  150.     int qp_avg, alpha, beta, tc;

  151.     int i;

  152. 

  153.     /* save un-deblocked lines */

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

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

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

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

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

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

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

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

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

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

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

  165.     }

  166.     if(!h->loop_filter_disable) {

  167.         /* determine bs */

  168.         if(mb_type == I_8X8)

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

  170.         else{

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

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

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

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

  175.             }

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

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

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

  179.             }

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

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

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

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

  184.         }

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

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

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

  188.                 SET_PARAMS;

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

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

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

  192.             }

  193.             qp_avg = h->qp;

  194.             SET_PARAMS;

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

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

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

  198. 

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

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

  201.                 SET_PARAMS;

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

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

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

  205.             }

  206.         }

  207.     }

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

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

  210. }

  211. 

  212. #undef SET_PARAMS

  213. 

  214. /*****************************************************************************

  215.  *

  216.  * spatial intra prediction

  217.  *

  218.  ****************************************************************************/

  219. 

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

  221.                                         uint8_t **left, int block) {

  222.     int i;

  223. 

  224.     switch(block) {

  225.     case 0:

  226.         *left = h->left_border_y;

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

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

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

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

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

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

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

  234.         break;

  235.     case 1:

  236.         *left = h->intern_border_y;

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

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

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

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

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

  242.         if(h->flags & C_AVAIL)

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

  244.         else

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

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

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

  248.         if(h->flags & B_AVAIL)

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

  250.         break;

  251.     case 2:

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

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

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

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

  256.         if(h->flags & A_AVAIL)

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

  258.         break;

  259.     case 3:

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

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

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

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

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

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

  266.         break;

  267.     }

  268. }

  269. 

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

  271.     int y;

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

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

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

  275.     }

  276. }

  277. 

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

  279.     int y;

  280.     uint64_t a;

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

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

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

  284.     }

  285. }

  286. 

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

  288.     int y;

  289.     uint64_t a = 0x8080808080808080ULL;

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

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

  292. }

  293. 

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

  295.     int x,y,ia;

  296.     int ih = 0;

  297.     int iv = 0;

  298.     uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;

  299. 

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

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

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

  303.     }

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

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

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

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

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

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

  310. }

  311. 

  312. #define LOWPASS(ARRAY,INDEX)                                            \

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

  314. 

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

  316.     int x,y;

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

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

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

  320. }

  321. 

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

  323.     int x,y;

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

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

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

  327. }

  328. 

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

  330.     int x,y;

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

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

  333.             if(x==y)

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

  335.             else if(x>y)

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

  337.             else

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

  339. }

  340. 

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

  342.     int x,y;

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

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

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

  346. }

  347. 

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

  349.     int x,y;

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

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

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

  353. }

  354. 

  355. #undef LOWPASS

  356. 

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

  358.     *mode = mod_table[*mode];

  359.     if(*mode < 0) {

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

  361.         *mode = 0;

  362.     }

  363. }

  364. 

  365. /*****************************************************************************

  366.  *

  367.  * motion compensation

  368.  *

  369.  ****************************************************************************/

  370. 

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

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

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

  374.                         int src_y_offset,qpel_mc_func *qpix_op,

  375.                         h264_chroma_mc_func chroma_op,vector_t *mv){

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

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

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

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

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

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

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

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

  384.     int extra_height= extra_width;

  385.     int emu=0;

  386.     const int full_mx= mx>>2;

  387.     const int full_my= my>>2;

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

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

  390. 

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

  392.         return;

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

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

  395. 

  396.     if(   full_mx < 0-extra_width

  397.           || full_my < 0-extra_height

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

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

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

  401.                             16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);

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

  403.         emu=1;

  404.     }

  405. 

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

  407.     if(!square){

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

  409.     }

  410. 

  411.     if(emu){

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

  413.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  414.         src_cb= s->edge_emu_buffer;

  415.     }

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

  417. 

  418.     if(emu){

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

  420.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  421.         src_cr= s->edge_emu_buffer;

  422.     }

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

  424. }

  425. 

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

  427.                         uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,

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

  429.                         h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,

  430.                         h264_chroma_mc_func chroma_avg, vector_t *mv){

  431.     qpel_mc_func *qpix_op=  qpix_put;

  432.     h264_chroma_mc_func chroma_op= chroma_put;

  433. 

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

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

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

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

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

  439. 

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

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

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

  443.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  444.                     qpix_op, chroma_op, mv);

  445. 

  446.         qpix_op=  qpix_avg;

  447.         chroma_op= chroma_avg;

  448.     }

  449. 

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

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

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

  453.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  454.                     qpix_op, chroma_op, mv+MV_BWD_OFFS);

  455.     }

  456. }

  457. 

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

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

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

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

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

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

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

  465.     }else{

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  486.     }

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

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

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

  490. }

  491. 

  492. /*****************************************************************************

  493.  *

  494.  * motion vector prediction

  495.  *

  496.  ****************************************************************************/

  497. 

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

  499.     switch(size) {

  500.     case BLK_16X16:

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

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

  503.     case BLK_16X8:

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

  505.         break;

  506.     case BLK_8X16:

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

  508.         break;

  509.     }

  510. }

  511. 

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

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

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

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

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

  517. }

  518. 

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

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

  521. 

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

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

  524. }

  525. 

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

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

  528.     int len_ab, len_bc, len_ca, len_mid;

  529. 

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

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

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

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

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

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

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

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

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

  539.     if(len_mid == len_ab) {

  540.         mvP->x = cx;

  541.         mvP->y = cy;

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

  543.         mvP->x = ax;

  544.         mvP->y = ay;

  545.     } else {

  546.         mvP->x = bx;

  547.         mvP->y = by;

  548.     }

  549. }

  550. 

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

  552.                                   vector_t *col_mv) {

  553.     vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS;

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

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

  556. 

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

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

  559.     pmv_fw->ref = 1;

  560.     pmv_bw->ref = 0;

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

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

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

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

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

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

  567. }

  568. 

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

  570.     vector_t *dst = src + MV_BWD_OFFS;

  571. 

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

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

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

  575.     dst->ref = 0;

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

  577.     set_mvs(dst, size);

  578. }

  579. 

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

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

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

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

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

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

  586.     const vector_t *mvP2 = NULL;

  587. 

  588.     mvP->ref = ref;

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

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

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

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

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

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

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

  596.         mvP2 = &un_mv;

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

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

  599.         mvP2= mvA;

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

  601.         mvP2= mvB;

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

  603.         mvP2= mvC;

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

  605.         mvP2= mvA;

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

  607.         mvP2= mvB;

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

  609.         mvP2= mvC;

  610.     }

  611.     if(mvP2){

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

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

  614.     }else

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

  616. 

  617.     if(mode < MV_PRED_PSKIP) {

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

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

  620.     }

  621.     set_mvs(mvP,size);

  622. }

  623. 

  624. /*****************************************************************************

  625.  *

  626.  * residual data decoding

  627.  *

  628.  ****************************************************************************/

  629. 

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

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

  632.     if(order) {

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

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

  635.     }

  636.     return get_ue_golomb(gb);

  637. }

  638. 

  639. /**

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

  641.  *  and add them to sample block

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

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

  644.  * @param qp quantizer

  645.  * @param dst location of sample block

  646.  * @param stride line stride in frame buffer

  647.  */

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

  649.                                  const residual_vlc_t *r, int esc_golomb_order,

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

  651.     int i,pos = -1;

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

  653.     int level_buf[64];

  654.     int run_buf[64];

  655.     int dqm = dequant_mul[qp];

  656.     int dqs = dequant_shift[qp];

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

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

  659.     DCTELEM *block = h->block;

  660. 

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

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

  663.         if(level_code >= ESCAPE_CODE) {

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

  665.             esc_code = get_ue_code(gb,esc_golomb_order);

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

  667.             while(level > r->inc_limit)

  668.                 r++;

  669.             mask = -(level_code & 1);

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

  671.         } else {

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

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

  674.                 break;

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

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

  677.         }

  678.         level_buf[i] = level;

  679.         run_buf[i] = run;

  680.     }

  681.     /* inverse scan and dequantization */

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

  683.         pos += run_buf[i];

  684.         if(pos > 63) {

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

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

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

  688.             return -1;

  689.         }

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

  691.     }

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

  693.     return 0;

  694. }

  695. 

  696. 

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

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

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

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

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

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

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

  704. }

  705. 

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

  707.     int block;

  708. 

  709.     /* get coded block pattern */

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

  711.     if(cbp > 63){

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

  713.         return -1;

  714.     }

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

  716. 

  717.     /* get quantizer */

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

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

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

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

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

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

  724.     decode_residual_chroma(h);

  725. 

  726.     return 0;

  727. }

  728. 

  729. /*****************************************************************************

  730.  *

  731.  * macroblock level

  732.  *

  733.  ****************************************************************************/

  734. 

  735. /**

  736.  * initialise predictors for motion vectors and intra prediction

  737.  */

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

  739.     int i;

  740. 

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

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

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

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

  745.     }

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

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

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

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

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

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

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

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

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

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

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

  757.         h->flags |= D_AVAIL;

  758.     }

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

  760.         h->flags &= ~C_AVAIL;

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

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

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

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

  765.     }

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

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

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

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

  770.     }

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

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

  773. }

  774. 

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

  776. 

  777. /**

  778.  * save predictors for later macroblocks and increase

  779.  * macroblock address

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

  781.  */

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

  783.     int i;

  784. 

  785.     h->flags |= A_AVAIL;

  786.     h->cy += 16;

  787.     h->cu += 8;

  788.     h->cv += 8;

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

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

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

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

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

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

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

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

  797.     /* next MB address */

  798.     h->mbx++;

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

  800.         h->flags = B_AVAIL|C_AVAIL;

  801.         /* clear left pred_modes */

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

  803.         /* clear left mv predictors */

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

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

  806.         h->mbx = 0;

  807.         h->mby++;

  808.         /* re-calculate sample pointers */

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

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

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

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

  813.             return 0;

  814.         } else {

  815.             //check_for_slice(h);

  816.         }

  817.     }

  818.     return 1;

  819. }

  820. 

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

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

  823.     int block, pred_mode_uv;

  824.     uint8_t top[18];

  825.     uint8_t *left = NULL;

  826.     uint8_t *d;

  827. 

  828.     init_mb(h);

  829. 

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

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

  832.         int nA,nB,predpred;

  833.         int pos = scan3x3[block];

  834. 

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

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

  837.         predpred = FFMIN(nA,nB);

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

  839.             predpred = INTRA_L_LP;

  840.         if(!get_bits1(gb)){

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

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

  843.         }

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

  845.     }

  846.     pred_mode_uv = get_ue_golomb(gb);

  847.     if(pred_mode_uv > 6) {

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

  849.         return -1;

  850.     }

  851. 

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

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

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

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

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

  857. 

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

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

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

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

  862.         modify_pred(left_modifier_c, &pred_mode_uv );

  863.     }

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

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

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

  867.         modify_pred(top_modifier_c, &pred_mode_uv );

  868.     }

  869. 

  870.     /* get coded block pattern */

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

  872.         cbp_code = get_ue_golomb(gb);

  873.     if(cbp_code > 63){

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

  875.         return -1;

  876.     }

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

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

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

  880. 

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

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

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

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

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

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

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

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

  889.     }

  890. 

  891.     /* chroma intra prediction */

  892.     /* extend borders by one pixel */

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

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

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

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

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

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

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

  900.     } else {

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

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

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

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

  905.     }

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

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

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

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

  910. 

  911.     decode_residual_chroma(h);

  912.     filter_mb(h,I_8X8);

  913. 

  914.     /* mark motion vectors as intra */

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

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

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

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

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

  920.         *h->col_type = I_8X8;

  921. 

  922.     return 0;

  923. }

  924. 

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

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

  927.     int ref[4];

  928. 

  929.     init_mb(h);

  930.     switch(mb_type) {

  931.     case P_SKIP:

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

  933.         break;

  934.     case P_16X16:

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

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

  937.         break;

  938.     case P_16X8:

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

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

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

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

  943.         break;

  944.     case P_8X16:

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

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

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

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

  949.         break;

  950.     case P_8X8:

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

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

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

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

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

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

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

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

  959.     }

  960.     inter_pred(h, mb_type);

  961.     store_mvs(h);

  962.     if(mb_type != P_SKIP)

  963.         decode_residual_inter(h);

  964.     filter_mb(h,mb_type);

  965.     *h->col_type = mb_type;

  966. }

  967. 

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

  969.     int block;

  970.     enum sub_mb_t sub_type[4];

  971.     int flags;

  972. 

  973.     init_mb(h);

  974. 

  975.     /* reset all MVs */

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

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

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

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

  980.     switch(mb_type) {

  981.     case B_SKIP:

  982.     case B_DIRECT:

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

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

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

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

  987.         } else

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

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

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

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

  992.         break;

  993.     case B_FWD_16X16:

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

  995.         break;

  996.     case B_SYM_16X16:

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

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

  999.         break;

  1000.     case B_BWD_16X16:

  1001.         mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);

  1002.         break;

  1003.     case B_8X8:

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

  1005.             sub_type[block] = get_bits(&h->s.gb,2);

  1006.         for(block=0;block<4;block++) {

  1007.             switch(sub_type[block]) {

  1008.             case B_SUB_DIRECT:

  1009.                 if(!(*h->col_type)) {

  1010.                     /* intra MB at co-location, do in-plane prediction */

  1011.                     mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1012.                             MV_PRED_BSKIP, BLK_8X8, 1);

  1013.                     mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1014.                             mv_scan[block]-3+MV_BWD_OFFS,

  1015.                             MV_PRED_BSKIP, BLK_8X8, 0);

  1016.                 } else

  1017.                     mv_pred_direct(h,&h->mv[mv_scan[block]],

  1018.                                    &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);

  1019.                 break;

  1020.             case B_SUB_FWD:

  1021.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1022.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1023.                 break;

  1024.             case B_SUB_SYM:

  1025.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1026.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1027.                 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);

  1028.                 break;

  1029.             }

  1030.         }

  1031.         for(block=0;block<4;block++) {

  1032.             if(sub_type[block] == B_SUB_BWD)

  1033.                 mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1034.                         mv_scan[block]+MV_BWD_OFFS-3,

  1035.                         MV_PRED_MEDIAN, BLK_8X8, 0);

  1036.         }

  1037.         break;

  1038.     default:

  1039.         assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));

  1040.         flags = partition_flags[mb_type];

  1041.         if(mb_type & 1) { /* 16x8 macroblock types */

  1042.             if(flags & FWD0)

  1043.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1044.             if(flags & SYM0)

  1045.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);

  1046.             if(flags & FWD1)

  1047.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1048.             if(flags & SYM1)

  1049.                 mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);

  1050.             if(flags & BWD0)

  1051.                 mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP,  BLK_16X8, 0);

  1052.             if(flags & BWD1)

  1053.                 mv_pred(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);

  1054.         } else {          /* 8x16 macroblock types */

  1055.             if(flags & FWD0)

  1056.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1057.             if(flags & SYM0)

  1058.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);

  1059.             if(flags & FWD1)

  1060.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1061.             if(flags & SYM1)

  1062.                 mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);

  1063.             if(flags & BWD0)

  1064.                 mv_pred(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);

  1065.             if(flags & BWD1)

  1066.                 mv_pred(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 0);

  1067.         }

  1068.     }

  1069.     inter_pred(h, mb_type);

  1070.     if(mb_type != B_SKIP)

  1071.         decode_residual_inter(h);

  1072.     filter_mb(h,mb_type);

  1073. }

  1074. 

  1075. /*****************************************************************************

  1076.  *

  1077.  * slice level

  1078.  *

  1079.  ****************************************************************************/

  1080. 

  1081. static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {

  1082.     if(h->stc > 0xAF)

  1083.         av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);

  1084.     h->mby = h->stc;

  1085.     if((h->mby == 0) && (!h->qp_fixed)){

  1086.         h->qp_fixed = get_bits1(gb);

  1087.         h->qp = get_bits(gb,6);

  1088.     }

  1089.     /* inter frame or second slice can have weighting params */

  1090.     if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2))

  1091.         if(get_bits1(gb)) { //slice_weighting_flag

  1092.             av_log(h->s.avctx, AV_LOG_ERROR,

  1093.                    "weighted prediction not yet supported\n");

  1094.         }

  1095.     return 0;

  1096. }

  1097. 

  1098. static inline void check_for_slice(AVSContext *h) {

  1099.     GetBitContext *gb = &h->s.gb;

  1100.     int align;

  1101.     align = (-get_bits_count(gb)) & 7;

  1102.     if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {

  1103.         get_bits_long(gb,24+align);

  1104.         h->stc = get_bits(gb,8);

  1105.         decode_slice_header(h,gb);

  1106.     }

  1107. }

  1108. 

  1109. /*****************************************************************************

  1110.  *

  1111.  * frame level

  1112.  *

  1113.  ****************************************************************************/

  1114. 

  1115. static void init_pic(AVSContext *h) {

  1116.     int i;

  1117. 

  1118.     /* clear some predictors */

  1119.     for(i=0;i<=20;i+=4)

  1120.         h->mv[i] = un_mv;

  1121.     h->mv[MV_BWD_X0] = dir_mv;

  1122.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1123.     h->mv[MV_FWD_X0] = dir_mv;

  1124.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1125.     h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;

  1126.     h->cy = h->picture.data[0];

  1127.     h->cu = h->picture.data[1];

  1128.     h->cv = h->picture.data[2];

  1129.     h->l_stride = h->picture.linesize[0];

  1130.     h->c_stride = h->picture.linesize[1];

  1131.     h->luma_scan[2] = 8*h->l_stride;

  1132.     h->luma_scan[3] = 8*h->l_stride+8;

  1133.     h->mbx = h->mby = 0;

  1134.     h->flags = 0;

  1135. }

  1136. 

  1137. static int decode_pic(AVSContext *h) {

  1138.     MpegEncContext *s = &h->s;

  1139.     int skip_count;

  1140.     enum mb_t mb_type;

  1141. 

  1142.     if (!s->context_initialized) {

  1143.         s->avctx->idct_algo = FF_IDCT_CAVS;

  1144.         if (MPV_common_init(s) < 0)

  1145.             return -1;

  1146.         ff_init_scantable(s->dsp.idct_permutation,&h->scantable,ff_zigzag_direct);

  1147.     }

  1148.     get_bits(&s->gb,16);//bbv_dwlay

  1149.     if(h->stc == PIC_PB_START_CODE) {

  1150.         h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE;

  1151.         if(h->pic_type > FF_B_TYPE) {

  1152.             av_log(s->avctx, AV_LOG_ERROR, "illegal picture type\n");

  1153.             return -1;

  1154.         }

  1155.         /* make sure we have the reference frames we need */

  1156.         if(!h->DPB[0].data[0] ||

  1157.           (!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE))

  1158.             return -1;

  1159.     } else {

  1160.         h->pic_type = FF_I_TYPE;

  1161.         if(get_bits1(&s->gb))

  1162.             get_bits(&s->gb,16);//time_code

  1163.     }

  1164.     /* release last B frame */

  1165.     if(h->picture.data[0])

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

  1167. 

  1168.     s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture);

  1169.     init_pic(h);

  1170.     h->picture.poc = get_bits(&s->gb,8)*2;

  1171. 

  1172.     /* get temporal distances and MV scaling factors */

  1173.     if(h->pic_type != FF_B_TYPE) {

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

  1175.     } else {

  1176.         h->dist[0] = (h->DPB[0].poc  - h->picture.poc + 512) % 512;

  1177.     }

  1178.     h->dist[1] = (h->picture.poc - h->DPB[1].poc  + 512) % 512;

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

  1180.     h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;

  1181.     if(h->pic_type == FF_B_TYPE) {

  1182.         h->sym_factor = h->dist[0]*h->scale_den[1];

  1183.     } else {

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

  1185.         h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0;

  1186.     }

  1187. 

  1188.     if(s->low_delay)

  1189.         get_ue_golomb(&s->gb); //bbv_check_times

  1190.     h->progressive             = get_bits1(&s->gb);

  1191.     if(h->progressive)

  1192.         h->pic_structure = 1;

  1193.     else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) )

  1194.         get_bits1(&s->gb);     //advanced_pred_mode_disable

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

  1196.     skip_bits1(&s->gb);        //repeat_first_field

  1197.     h->qp_fixed                = get_bits1(&s->gb);

  1198.     h->qp                      = get_bits(&s->gb,6);

  1199.     if(h->pic_type == FF_I_TYPE) {

  1200.         if(!h->progressive && !h->pic_structure)

  1201.             skip_bits1(&s->gb);//what is this?

  1202.         skip_bits(&s->gb,4);   //reserved bits

  1203.     } else {

  1204.         if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1))

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

  1206.         skip_bits(&s->gb,4);   //reserved bits

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

  1208.     }

  1209.     h->loop_filter_disable     = get_bits1(&s->gb);

  1210.     if(!h->loop_filter_disable && get_bits1(&s->gb)) {

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

  1212.         h->beta_offset         = get_se_golomb(&s->gb);

  1213.     } else {

  1214.         h->alpha_offset = h->beta_offset  = 0;

  1215.     }

  1216.     check_for_slice(h);

  1217.     if(h->pic_type == FF_I_TYPE) {

  1218.         do {

  1219.             decode_mb_i(h, 0);

  1220.         } while(next_mb(h));

  1221.     } else if(h->pic_type == FF_P_TYPE) {

  1222.         do {

  1223.             if(h->skip_mode_flag) {

  1224.                 skip_count = get_ue_golomb(&s->gb);

  1225.                 while(skip_count--) {

  1226.                     decode_mb_p(h,P_SKIP);

  1227.                     if(!next_mb(h))

  1228.                         goto done;

  1229.                 }

  1230.                 mb_type = get_ue_golomb(&s->gb) + P_16X16;

  1231.             } else

  1232.                 mb_type = get_ue_golomb(&s->gb) + P_SKIP;

  1233.             if(mb_type > P_8X8) {

  1234.                 decode_mb_i(h, mb_type - P_8X8 - 1);

  1235.             } else

  1236.                 decode_mb_p(h,mb_type);

  1237.         } while(next_mb(h));

  1238.     } else { /* FF_B_TYPE */

  1239.         do {

  1240.             if(h->skip_mode_flag) {

  1241.                 skip_count = get_ue_golomb(&s->gb);

  1242.                 while(skip_count--) {

  1243.                     decode_mb_b(h,B_SKIP);

  1244.                     if(!next_mb(h))

  1245.                         goto done;

  1246.                 }

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

  1248.             } else

  1249.                 mb_type = get_ue_golomb(&s->gb) + B_SKIP;

  1250.             if(mb_type > B_8X8) {

  1251.                 decode_mb_i(h, mb_type - B_8X8 - 1);

  1252.             } else

  1253.                 decode_mb_b(h,mb_type);

  1254.         } while(next_mb(h));

  1255.     }

  1256.  done:

  1257.     if(h->pic_type != FF_B_TYPE) {

  1258.         if(h->DPB[1].data[0])

  1259.             s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]);

  1260.         memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture));

  1261.         memcpy(&h->DPB[0], &h->picture, sizeof(Picture));

  1262.         memset(&h->picture,0,sizeof(Picture));

  1263.     }

  1264.     return 0;

  1265. }

  1266. 

  1267. /*****************************************************************************

  1268.  *

  1269.  * headers and interface

  1270.  *

  1271.  ****************************************************************************/

  1272. 

  1273. /**

  1274.  * some predictions require data from the top-neighbouring macroblock.

  1275.  * this data has to be stored for one complete row of macroblocks

  1276.  * and this storage space is allocated here

  1277.  */

  1278. static void init_top_lines(AVSContext *h) {

  1279.     /* alloc top line of predictors */

  1280.     h->top_qp       = av_malloc( h->mb_width);

  1281.     h->top_mv[0]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1282.     h->top_mv[1]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1283.     h->top_pred_Y   = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));

  1284.     h->top_border_y = av_malloc((h->mb_width+1)*16);

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

  1286.     h->top_border_v = av_malloc((h->mb_width)*10);

  1287. 

  1288.     /* alloc space for co-located MVs and types */

  1289.     h->col_mv       = av_malloc( h->mb_width*h->mb_height*4*sizeof(vector_t));

  1290.     h->col_type_base = av_malloc(h->mb_width*h->mb_height);

  1291.     h->block        = av_mallocz(64*sizeof(DCTELEM));

  1292. }

  1293. 

  1294. static int decode_seq_header(AVSContext *h) {

  1295.     MpegEncContext *s = &h->s;

  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 CAVS_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.                            const 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, &buf, &buf_size) < 0) {

  1522.             *poutbuf = NULL;

  1523.             *poutbuf_size = 0;

  1524.             return buf_size;

  1525.         }

  1526.     }

  1527.     *poutbuf = 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 */