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FFmpeg/libavcodec/cavs.c

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  1. /*

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

  3.  * Copyright (c) 2006  Stefan Gehrer <stefan.gehrer@gmx.de>

  4.  *

  5.  * This library is free software; you can redistribute it and/or

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

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

  8.  * version 2 of the License, or (at your option) any later version.

  9.  *

  10.  * This library is distributed in the hope that it will be useful,

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

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

  13.  * Lesser General Public License for more details.

  14.  *

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

  16.  * License along with this library; if not, write to the Free Software

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

  18.  */

  19. 

  20. #include "avcodec.h"

  21. #include "bitstream.h"

  22. #include "golomb.h"

  23. #include "mpegvideo.h"

  24. #include "cavsdata.h"

  25. 

  26. typedef struct {

  27.     MpegEncContext s;

  28.     Picture picture; //currently decoded frame

  29.     Picture DPB[2];  //reference frames

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

  31.     int profile, level;

  32.     int aspect_ratio;

  33.     int mb_width, mb_height;

  34.     int pic_type;

  35.     int progressive;

  36.     int pic_structure;

  37.     int skip_mode_flag;

  38.     int loop_filter_disable;

  39.     int alpha_offset, beta_offset;

  40.     int ref_flag;

  41.     int mbx, mby;

  42.     int flags;

  43.     int stc;

  44.     uint8_t *cy, *cu, *cv;

  45.     int left_qp;

  46.     uint8_t *top_qp;

  47. 

  48.     /* mv motion vector cache

  49.        0:    D3  B2  B3  C2

  50.        4:    A1  X0  X1   -

  51.        8:    A3  X2  X3   -

  52. 

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

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

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

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

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

  58. 

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

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

  61.     vector_t *top_mv[2];

  62.     vector_t *col_mv;

  63. 

  64.     /* luma pred mode cache

  65.        0:    --  B2  B3

  66.        3:    A1  X0  X1

  67.        6:    A3  X2  X3   */

  68.     int pred_mode_Y[3*3];

  69.     int *top_pred_Y;

  70.     int l_stride, c_stride;

  71.     int luma_scan[4];

  72.     int qp;

  73.     int qp_fixed;

  74.     int cbp;

  75. 

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

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

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

  79.     uint8_t left_border_y[16], left_border_u[10], left_border_v[10];

  80.     uint8_t topleft_border_y, topleft_border_u, topleft_border_v;

  81. 

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

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

  84.     uint8_t *col_type_base;

  85.     uint8_t *col_type;

  86.     int sym_factor;

  87.     int direct_den[2];

  88.     int scale_den[2];

  89.     int got_keyframe;

  90. } AVSContext;

  91. 

  92. /*****************************************************************************

  93.  *

  94.  * in-loop deblocking filter

  95.  *

  96.  ****************************************************************************/

  97. 

  98. static inline int get_bs_p(vector_t *mvP, vector_t *mvQ) {

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

  100.         return 2;

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

  102.         return 1;

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

  104.         return 1;

  105.     return 0;

  106. }

  107. 

  108. static inline int get_bs_b(vector_t *mvP, vector_t *mvQ) {

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

  110.         return 2;

  111.     } else {

  112.         vector_t *mvPbw = mvP + MV_BWD_OFFS;

  113.         vector_t *mvQbw = mvQ + MV_BWD_OFFS;

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

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

  116.             (abs(mvPbw->x - mvQbw->x) >= 4) ||

  117.             (abs(mvPbw->y - mvQbw->y) >= 4) )

  118.             return 1;

  119.     }

  120.     return 0;

  121. }

  122. 

  123. /* boundary strength (bs) mapping:

  124.  *

  125.  * --4---5--

  126.  * 0   2   |

  127.  * | 6 | 7 |

  128.  * 1   3   |

  129.  * ---------

  130.  *

  131.  */

  132. 

  133. #define SET_PARAMS                                            \

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

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

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

  137. 

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

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

  140.     int qp_avg, alpha, beta, tc;

  141.     int i;

  142. 

  143.     /* save un-deblocked lines */

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

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

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

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

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

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

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

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

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

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

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

  155.     }

  156.     if(!h->loop_filter_disable) {

  157.         /* clear bs */

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

  159.         /* determine bs */

  160.         switch(mb_type) {

  161.         case I_8X8:

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

  163.             break;

  164.         case P_8X8:

  165.         case P_8X16:

  166.             bs[2] = get_bs_p(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1]);

  167.             bs[3] = get_bs_p(&h->mv[MV_FWD_X2], &h->mv[MV_FWD_X3]);

  168.         case P_16X8:

  169.             bs[6] = get_bs_p(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2]);

  170.             bs[7] = get_bs_p(&h->mv[MV_FWD_X1], &h->mv[MV_FWD_X3]);

  171.         case P_16X16:

  172.         case P_SKIP:

  173.             bs[0] = get_bs_p(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0]);

  174.             bs[1] = get_bs_p(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2]);

  175.             bs[4] = get_bs_p(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0]);

  176.             bs[5] = get_bs_p(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1]);

  177.             break;

  178.         case B_SKIP:

  179.         case B_DIRECT:

  180.         case B_8X8:

  181.             bs[2] = get_bs_b(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1]);

  182.             bs[3] = get_bs_b(&h->mv[MV_FWD_X2], &h->mv[MV_FWD_X3]);

  183.             bs[6] = get_bs_b(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2]);

  184.             bs[7] = get_bs_b(&h->mv[MV_FWD_X1], &h->mv[MV_FWD_X3]);

  185.         case B_FWD_16X16:

  186.         case B_BWD_16X16:

  187.         case B_SYM_16X16:

  188.             bs[0] = get_bs_b(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0]);

  189.             bs[1] = get_bs_b(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2]);

  190.             bs[4] = get_bs_b(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0]);

  191.             bs[5] = get_bs_b(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1]);

  192.             break;

  193.         default:

  194.             if(mb_type & 1) { //16X8

  195.                 bs[6] = bs[7] = get_bs_b(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2]);

  196.             } else {          //8X16

  197.                 bs[2] = bs[3] = get_bs_b(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1]);

  198.             }

  199.             bs[0] = get_bs_b(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0]);

  200.             bs[1] = get_bs_b(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2]);

  201.             bs[4] = get_bs_b(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0]);

  202.             bs[5] = get_bs_b(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1]);

  203.         }

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

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

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

  207.                 SET_PARAMS;

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

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

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

  211.             }

  212.             qp_avg = h->qp;

  213.             SET_PARAMS;

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

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

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

  217. 

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

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

  220.                 SET_PARAMS;

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

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

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

  224.             }

  225.         }

  226.     }

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

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

  229. }

  230. 

  231. #undef SET_PARAMS

  232. 

  233. /*****************************************************************************

  234.  *

  235.  * spatial intra prediction

  236.  *

  237.  ****************************************************************************/

  238. 

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

  240.                                         uint8_t *left, int block) {

  241.     int i;

  242. 

  243.     switch(block) {

  244.     case 0:

  245.         memcpy(&left[1],h->left_border_y,16);

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

  247.         left[17] = left[16];

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

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

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

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

  252.             left[0] = top[0] = h->topleft_border_y;

  253.         break;

  254.     case 1:

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

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

  257.         memset(&left[9],left[8],9);

  258.         left[0] = left[1];

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

  260.         if(h->flags & C_AVAIL)

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

  262.         else

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

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

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

  266.         if(h->flags & B_AVAIL)

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

  268.         break;

  269.     case 2:

  270.         memcpy(&left[1],&h->left_border_y[8],8);

  271.         memset(&left[9],left[8],9);

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

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

  274.         left[0] = h->left_border_y[7];

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

  276.         if(h->flags & A_AVAIL)

  277.             top[0] = left[0];

  278.         break;

  279.     case 3:

  280.         for(i=0;i<9;i++)

  281.             left[i] = *(h->cy + 7 + (i+7)*h->l_stride);

  282.         memset(&left[9],left[8],9);

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

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

  285.         break;

  286.     }

  287. }

  288. 

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

  290.     int y;

  291.     uint64_t a = *((uint64_t *)(&top[1]));

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

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

  294.     }

  295. }

  296. 

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

  298.     int y;

  299.     uint64_t a;

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

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

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

  303.     }

  304. }

  305. 

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

  307.     int y;

  308.     uint64_t a = 0x8080808080808080ULL;

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

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

  311. }

  312. 

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

  314.     int x,y,ia;

  315.     int ih = 0;

  316.     int iv = 0;

  317.     uint8_t *cm = cropTbl + MAX_NEG_CROP;

  318. 

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

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

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

  322.     }

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

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

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

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

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

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

  329. }

  330. 

  331. #define LOWPASS(ARRAY,INDEX)                                            \

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

  333. 

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

  335.     int x,y;

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

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

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

  339. }

  340. 

  341. static void intra_pred_down_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(top,x+y+2) + LOWPASS(left,x+y+2)) >> 1;

  346. }

  347. 

  348. static void intra_pred_down_right(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.             if(x==y)

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

  354.             else if(x>y)

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

  356.             else

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

  358. }

  359. 

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

  361.     int x,y;

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

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

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

  365. }

  366. 

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

  368.     int x,y;

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

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

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

  372. }

  373. 

  374. #undef LOWPASS

  375. 

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

  377.     int newmode = mod_table[*mode];

  378.     if(newmode < 0) {

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

  380.         *mode = 0;

  381.     } else {

  382.         *mode = newmode;

  383.     }

  384. }

  385. 

  386. /*****************************************************************************

  387.  *

  388.  * motion compensation

  389.  *

  390.  ****************************************************************************/

  391. 

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

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

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

  395.                         int src_y_offset,qpel_mc_func *qpix_op,

  396.                         h264_chroma_mc_func chroma_op,vector_t *mv){

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

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

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

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

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

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

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

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

  405.     int extra_height= extra_width;

  406.     int emu=0;

  407.     const int full_mx= mx>>2;

  408.     const int full_my= my>>2;

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

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

  411. 

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

  413.         return;

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

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

  416. 

  417.     if(   full_mx < 0-extra_width

  418.           || full_my < 0-extra_height

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

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

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

  422.                             16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);

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

  424.         emu=1;

  425.     }

  426. 

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

  428.     if(!square){

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

  430.     }

  431. 

  432.     if(emu){

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

  434.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  435.         src_cb= s->edge_emu_buffer;

  436.     }

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

  438. 

  439.     if(emu){

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

  441.                             9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);

  442.         src_cr= s->edge_emu_buffer;

  443.     }

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

  445. }

  446. 

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

  448.                         uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,

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

  450.                         h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,

  451.                         h264_chroma_mc_func chroma_avg, vector_t *mv){

  452.     qpel_mc_func *qpix_op=  qpix_put;

  453.     h264_chroma_mc_func chroma_op= chroma_put;

  454. 

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

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

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

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

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

  460. 

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

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

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

  464.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  465.                     qpix_op, chroma_op, mv);

  466. 

  467.         qpix_op=  qpix_avg;

  468.         chroma_op= chroma_avg;

  469.     }

  470. 

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

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

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

  474.                     dest_y, dest_cb, dest_cr, x_offset, y_offset,

  475.                     qpix_op, chroma_op, mv+MV_BWD_OFFS);

  476.     }

  477. }

  478. 

  479. static void inter_pred(AVSContext *h) {

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

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

  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_X0]);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  504. }

  505. 

  506. /*****************************************************************************

  507.  *

  508.  * motion vector prediction

  509.  *

  510.  ****************************************************************************/

  511. 

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

  513.     switch(size) {

  514.     case BLK_16X16:

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

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

  517.     case BLK_16X8:

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

  519.         break;

  520.     case BLK_8X16:

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

  522.         break;

  523.     }

  524. }

  525. 

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

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

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

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

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

  531. }

  532. 

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

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

  535. 

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

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

  538. }

  539. 

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

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

  542.     int len_ab, len_bc, len_ca, len_mid;

  543. 

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

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

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

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

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

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

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

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

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

  553.     if(len_mid == len_ab) {

  554.         mvP->x = cx;

  555.         mvP->y = cy;

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

  557.         mvP->x = ax;

  558.         mvP->y = ay;

  559.     } else {

  560.         mvP->x = bx;

  561.         mvP->y = by;

  562.     }

  563. }

  564. 

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

  566.                                   vector_t *pmv_bw, vector_t *col_mv) {

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

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

  569. 

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

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

  572.     pmv_fw->ref = 1;

  573.     pmv_bw->ref = 0;

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

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

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

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

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

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

  580. }

  581. 

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

  583.     vector_t *dst = src + MV_BWD_OFFS;

  584. 

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

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

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

  588.     dst->ref = 0;

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

  590.     set_mvs(dst, size);

  591. }

  592. 

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

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

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

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

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

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

  599.     int mvAref = mvA->ref;

  600.     int mvBref = mvB->ref;

  601.     int mvCref;

  602. 

  603.     mvP->ref = ref;

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

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

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

  607.     mvCref = mvC->ref;

  608.     if(mode == MV_PRED_PSKIP) {

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

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

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

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

  613.             set_mvs(mvP,size);

  614.             return;

  615.         }

  616.     }

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

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

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

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

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

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

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

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

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

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

  627.     } else {

  628.         switch(mode) {

  629.         case MV_PRED_LEFT:

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

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

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

  633.             } else

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

  635.             break;

  636.         case MV_PRED_TOP:

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

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

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

  640.             } else

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

  642.             break;

  643.         case MV_PRED_TOPRIGHT:

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

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

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

  647.             } else

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

  649.             break;

  650.         default:

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

  652.             break;

  653.         }

  654.     }

  655.     if(mode < MV_PRED_PSKIP) {

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

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

  658.     }

  659.     set_mvs(mvP,size);

  660. }

  661. 

  662. /*****************************************************************************

  663.  *

  664.  * residual data decoding

  665.  *

  666.  ****************************************************************************/

  667. 

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

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

  670.     if(order) {

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

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

  673.     }

  674.     return get_ue_golomb(gb);

  675. }

  676. 

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

  678.                                  const residual_vlc_t *r, int esc_golomb_order,

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

  680.     int i,pos = -1;

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

  682.     int level_buf[64];

  683.     int run_buf[64];

  684.     int dqm = dequant_mul[qp];

  685.     int dqs = dequant_shift[qp];

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

  687.     const uint8_t *scantab = ff_zigzag_direct;

  688.     DCTELEM block[64];

  689. 

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

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

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

  693.         if(level_code >= ESCAPE_CODE) {

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

  695.             esc_code = get_ue_code(gb,esc_golomb_order);

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

  697.             while(level > r->inc_limit)

  698.                 r++;

  699.             mask = -(level_code & 1);

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

  701.         } else {

  702.             if(level_code < 0)

  703.                 return -1;

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

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

  706.                 break;

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

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

  709.         }

  710.         level_buf[i] = level;

  711.         run_buf[i] = run;

  712.     }

  713.     /* inverse scan and dequantization */

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

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

  716.         if(pos > 63) {

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

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

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

  720.             return -1;

  721.         }

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

  723.     }

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

  725.     return 0;

  726. }

  727. 

  728. 

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

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

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

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

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

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

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

  736. }

  737. 

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

  739.     int block;

  740. 

  741.     /* get coded block pattern */

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

  743.     /* get quantizer */

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

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

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

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

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

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

  750.     decode_residual_chroma(h);

  751. }

  752. 

  753. /*****************************************************************************

  754.  *

  755.  * macroblock level

  756.  *

  757.  ****************************************************************************/

  758. 

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

  760.     int i;

  761. 

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

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

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

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

  766.     }

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

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

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

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

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

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

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

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

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

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

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

  778.         h->flags |= D_AVAIL;

  779.     }

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

  781.         h->flags &= ~C_AVAIL;

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

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

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

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

  786.     }

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

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

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

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

  791.     }

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

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

  794. }

  795. 

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

  797. 

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

  799.     int i;

  800. 

  801.     h->flags |= A_AVAIL;

  802.     h->cy += 16;

  803.     h->cu += 8;

  804.     h->cv += 8;

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

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

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

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

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

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

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

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

  813.     /* next MB address */

  814.     h->mbx++;

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

  816.         h->flags = B_AVAIL|C_AVAIL;

  817.         /* clear left pred_modes */

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

  819.         /* clear left mv predictors */

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

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

  822.         h->mbx = 0;

  823.         h->mby++;

  824.         /* re-calculate sample pointers */

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

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

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

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

  829.             return 0;

  830.         } else {

  831.             //check_for_slice(h);

  832.         }

  833.     }

  834.     return 1;

  835. }

  836. 

  837. static void decode_mb_i(AVSContext *h, int is_i_pic) {

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

  839.     int block, pred_mode_uv;

  840.     uint8_t top[18];

  841.     uint8_t left[18];

  842.     uint8_t *d;

  843. 

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

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

  846.         int nA,nB,predpred;

  847.         int pos = scan3x3[block];

  848. 

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

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

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

  852.             predpred = 2;

  853.         else

  854.             predpred = FFMIN(nA,nB);

  855.         if(get_bits1(gb))

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

  857.         else {

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

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

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

  861.         }

  862.     }

  863.     pred_mode_uv = get_ue_golomb(gb);

  864.     if(pred_mode_uv > 6) {

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

  866.         pred_mode_uv = 0;

  867.     }

  868. 

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

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

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

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

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

  874. 

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

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

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

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

  879.         modify_pred(left_modifier_c, &pred_mode_uv );

  880.     }

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

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

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

  884.         modify_pred(top_modifier_c, &pred_mode_uv );

  885.     }

  886. 

  887.     /* get coded block pattern */

  888.     if(is_i_pic)

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

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

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

  892. 

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

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

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

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

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

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

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

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

  901.     }

  902. 

  903.     /* chroma intra prediction */

  904.     /* extend borders by one pixel */

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

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

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

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

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

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

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

  912.     } else {

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

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

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

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

  917.     }

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

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

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

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

  922. 

  923.     decode_residual_chroma(h);

  924.     filter_mb(h,I_8X8);

  925. 

  926.     /* mark motion vectors as intra */

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

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

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

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

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

  932.         *h->col_type = I_8X8;

  933. }

  934. 

  935. static void mb_skip_p(AVSContext *h) {

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

  937.     inter_pred(h);

  938.     store_mvs(h);

  939.     filter_mb(h,P_SKIP);

  940.     *h->col_type = P_SKIP;

  941. }

  942. 

  943. 

  944. static void mb_skip_b(AVSContext *h) {

  945.     int i;

  946. 

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

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

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

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

  951.     } else {

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

  953.         for(i=0;i<4;i++)

  954.             mv_pred_direct(h,&h->mv[mv_scan[i]],

  955.                            &h->mv[mv_scan[i]+MV_BWD_OFFS],

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

  957.     }

  958. }

  959. 

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

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

  962.     int ref[4];

  963. 

  964.     switch(mb_type) {

  965.     case P_SKIP:

  966.         mb_skip_p(h);

  967.         return;

  968.     case P_16X16:

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

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

  971.         break;

  972.     case P_16X8:

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

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

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

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

  977.         break;

  978.     case P_8X16:

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

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

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

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

  983.         break;

  984.     case P_8X8:

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

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

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

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

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

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

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

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

  993.     }

  994.     inter_pred(h);

  995.     store_mvs(h);

  996.     decode_residual_inter(h);

  997.     filter_mb(h,mb_type);

  998.     *h->col_type = mb_type;

  999. }

  1000. 

  1001. static void decode_mb_b(AVSContext *h, enum mb_t mb_type) {

  1002.     int block;

  1003.     enum sub_mb_t sub_type[4];

  1004.     int flags;

  1005. 

  1006.     /* reset all MVs */

  1007.     h->mv[MV_FWD_X0] = dir_mv;

  1008.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1009.     h->mv[MV_BWD_X0] = dir_mv;

  1010.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1011.     switch(mb_type) {

  1012.     case B_SKIP:

  1013.         mb_skip_b(h);

  1014.         inter_pred(h);

  1015.         filter_mb(h,B_SKIP);

  1016.         return;

  1017.     case B_DIRECT:

  1018.         mb_skip_b(h);

  1019.         break;

  1020.     case B_FWD_16X16:

  1021.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);

  1022.         break;

  1023.     case B_SYM_16X16:

  1024.         mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);

  1025.         mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);

  1026.         break;

  1027.     case B_BWD_16X16:

  1028.         mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);

  1029.         break;

  1030.     case B_8X8:

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

  1032.             sub_type[block] = get_bits(&h->s.gb,2);

  1033.         for(block=0;block<4;block++) {

  1034.             switch(sub_type[block]) {

  1035.             case B_SUB_DIRECT:

  1036.                 if(!(*h->col_type)) {

  1037.                     /* intra MB at co-location, do in-plane prediction */

  1038.                     mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1039.                             MV_PRED_BSKIP, BLK_8X8, 1);

  1040.                     mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1041.                             mv_scan[block]-3+MV_BWD_OFFS,

  1042.                             MV_PRED_BSKIP, BLK_8X8, 0);

  1043.                 } else

  1044.                     mv_pred_direct(h,&h->mv[mv_scan[block]],

  1045.                                    &h->mv[mv_scan[block]+MV_BWD_OFFS],

  1046.                                    &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);

  1047.                 break;

  1048.             case B_SUB_FWD:

  1049.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1050.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1051.                 break;

  1052.             case B_SUB_SYM:

  1053.                 mv_pred(h, mv_scan[block], mv_scan[block]-3,

  1054.                         MV_PRED_MEDIAN, BLK_8X8, 1);

  1055.                 mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);

  1056.                 break;

  1057.             }

  1058.         }

  1059.         for(block=0;block<4;block++) {

  1060.             if(sub_type[block] == B_SUB_BWD)

  1061.                 mv_pred(h, mv_scan[block]+MV_BWD_OFFS,

  1062.                         mv_scan[block]+MV_BWD_OFFS-3,

  1063.                         MV_PRED_MEDIAN, BLK_8X8, 0);

  1064.         }

  1065.         break;

  1066.     default:

  1067.         assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));

  1068.         flags = b_partition_flags[(mb_type-1)>>1];

  1069.         if(mb_type & 1) { /* 16x8 macroblock types */

  1070.             if(flags & FWD0)

  1071.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1072.             if(flags & SYM0) {

  1073.                 mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP,  BLK_16X8, 1);

  1074.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);

  1075.             }

  1076.             if(flags & FWD1)

  1077.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1078.             if(flags & SYM1) {

  1079.                 mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);

  1080.                 mv_pred_sym(h, &h->mv[9], BLK_16X8);

  1081.             }

  1082.             if(flags & BWD0)

  1083.                 mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP,  BLK_16X8, 0);

  1084.             if(flags & BWD1)

  1085.                 mv_pred(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);

  1086.         } else {          /* 8x16 macroblock types */

  1087.             if(flags & FWD0)

  1088.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1089.             if(flags & SYM0) {

  1090.                 mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);

  1091.                 mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);

  1092.             }

  1093.             if(flags & FWD1)

  1094.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1095.             if(flags & SYM1) {

  1096.                 mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);

  1097.                 mv_pred_sym(h, &h->mv[6], BLK_8X16);

  1098.             }

  1099.             if(flags & BWD0)

  1100.                 mv_pred(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);

  1101.             if(flags & BWD1)

  1102.                 mv_pred(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 0);

  1103.         }

  1104.     }

  1105.     inter_pred(h);

  1106.     decode_residual_inter(h);

  1107.     filter_mb(h,mb_type);

  1108. }

  1109. 

  1110. /*****************************************************************************

  1111.  *

  1112.  * slice level

  1113.  *

  1114.  ****************************************************************************/

  1115. 

  1116. static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {

  1117.     if(h->stc > 0xAF)

  1118.         av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);

  1119.     h->mby = h->stc;

  1120.     if((h->mby == 0) && (!h->qp_fixed)){

  1121.         h->qp_fixed = get_bits1(gb);

  1122.         h->qp = get_bits(gb,6);

  1123.     }

  1124.     /* inter frame or second slice can have weighting params */

  1125.     if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2))

  1126.         if(get_bits1(gb)) { //slice_weighting_flag

  1127.             av_log(h->s.avctx, AV_LOG_ERROR,

  1128.                    "weighted prediction not yet supported\n");

  1129.         }

  1130.     return 0;

  1131. }

  1132. 

  1133. static inline void check_for_slice(AVSContext *h) {

  1134.     GetBitContext *gb = &h->s.gb;

  1135.     int align;

  1136.     align = (-get_bits_count(gb)) & 7;

  1137.     if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {

  1138.         get_bits_long(gb,24+align);

  1139.         h->stc = get_bits(gb,8);

  1140.         decode_slice_header(h,gb);

  1141.     }

  1142. }

  1143. 

  1144. /*****************************************************************************

  1145.  *

  1146.  * frame level

  1147.  *

  1148.  ****************************************************************************/

  1149. 

  1150. static void init_pic(AVSContext *h) {

  1151.     int i;

  1152. 

  1153.     /* clear some predictors */

  1154.     for(i=0;i<=20;i+=4)

  1155.         h->mv[i] = un_mv;

  1156.     h->mv[MV_BWD_X0] = dir_mv;

  1157.     set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);

  1158.     h->mv[MV_FWD_X0] = dir_mv;

  1159.     set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);

  1160.     h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;

  1161.     h->cy = h->picture.data[0];

  1162.     h->cu = h->picture.data[1];

  1163.     h->cv = h->picture.data[2];

  1164.     h->l_stride = h->picture.linesize[0];

  1165.     h->c_stride = h->picture.linesize[1];

  1166.     h->luma_scan[2] = 8*h->l_stride;

  1167.     h->luma_scan[3] = 8*h->l_stride+8;

  1168.     h->mbx = h->mby = 0;

  1169.     h->flags = 0;

  1170. }

  1171. 

  1172. static int decode_pic(AVSContext *h) {

  1173.     MpegEncContext *s = &h->s;

  1174.     int i,skip_count;

  1175.     enum mb_t mb_type;

  1176. 

  1177.     if (!s->context_initialized) {

  1178.         if (MPV_common_init(s) < 0)

  1179.             return -1;

  1180.     }

  1181.     get_bits(&s->gb,16);//bbv_dwlay

  1182.     if(h->stc == PIC_PB_START_CODE) {

  1183.         h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE;

  1184.         /* make sure we have the reference frames we need */

  1185.         if(!h->DPB[0].data[0] ||

  1186.           (!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE))

  1187.             return -1;

  1188.     } else {

  1189.         h->pic_type = FF_I_TYPE;

  1190.         if(get_bits1(&s->gb))

  1191.             get_bits(&s->gb,16);//time_code

  1192.     }

  1193.     /* release last B frame */

  1194.     if(h->picture.data[0])

  1195.         s->avctx->release_buffer(s->avctx, (AVFrame *)&h->picture);

  1196. 

  1197.     s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture);

  1198.     init_pic(h);

  1199.     h->picture.poc = get_bits(&s->gb,8)*2;

  1200. 

  1201.     /* get temporal distances and MV scaling factors */

  1202.     if(h->pic_type != FF_B_TYPE) {

  1203.         h->dist[0] = (h->picture.poc - h->DPB[0].poc  + 512) % 512;

  1204.     } else {

  1205.         h->dist[0] = (h->DPB[0].poc  - h->picture.poc + 512) % 512;

  1206.     }

  1207.     h->dist[1] = (h->picture.poc - h->DPB[1].poc  + 512) % 512;

  1208.     h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;

  1209.     h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;

  1210.     if(h->pic_type == FF_B_TYPE) {

  1211.         h->sym_factor = h->dist[0]*h->scale_den[1];

  1212.     } else {

  1213.         h->direct_den[0] = h->dist[0] ? 16384/h->dist[0] : 0;

  1214.         h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0;

  1215.     }

  1216. 

  1217.     if(s->low_delay)

  1218.         get_ue_golomb(&s->gb); //bbv_check_times

  1219.     h->progressive             = get_bits1(&s->gb);

  1220.     if(h->progressive)

  1221.         h->pic_structure = 1;

  1222.     else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) )

  1223.         get_bits1(&s->gb);     //advanced_pred_mode_disable

  1224.     skip_bits1(&s->gb);        //top_field_first

  1225.     skip_bits1(&s->gb);        //repeat_first_field

  1226.     h->qp_fixed                = get_bits1(&s->gb);

  1227.     h->qp                      = get_bits(&s->gb,6);

  1228.     if(h->pic_type == FF_I_TYPE) {

  1229.         if(!h->progressive && !h->pic_structure)

  1230.             skip_bits1(&s->gb);//what is this?

  1231.         skip_bits(&s->gb,4);   //reserved bits

  1232.     } else {

  1233.         if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1))

  1234.             h->ref_flag        = get_bits1(&s->gb);

  1235.         skip_bits(&s->gb,4);   //reserved bits

  1236.         h->skip_mode_flag      = get_bits1(&s->gb);

  1237.     }

  1238.     h->loop_filter_disable     = get_bits1(&s->gb);

  1239.     if(!h->loop_filter_disable && get_bits1(&s->gb)) {

  1240.         h->alpha_offset        = get_se_golomb(&s->gb);

  1241.         h->beta_offset         = get_se_golomb(&s->gb);

  1242.     } else {

  1243.         h->alpha_offset = h->beta_offset  = 0;

  1244.     }

  1245.     check_for_slice(h);

  1246.     if(h->pic_type == FF_I_TYPE) {

  1247.         do {

  1248.             init_mb(h);

  1249.             decode_mb_i(h,1);

  1250.         } while(next_mb(h));

  1251.     } else if(h->pic_type == FF_P_TYPE) {

  1252.         do {

  1253.             if(h->skip_mode_flag) {

  1254.                 skip_count = get_ue_golomb(&s->gb);

  1255.                 for(i=0;i<skip_count;i++) {

  1256.                     init_mb(h);

  1257.                     mb_skip_p(h);

  1258.                     if(!next_mb(h))

  1259.                         goto done;

  1260.                 }

  1261.                 mb_type = get_ue_golomb(&s->gb) + P_16X16;

  1262.             } else {

  1263.                 mb_type = get_ue_golomb(&s->gb) + P_SKIP;

  1264.             }

  1265.             init_mb(h);

  1266.             if(mb_type > P_8X8) {

  1267.                 h->cbp = cbp_tab[mb_type - P_8X8 - 1][0];

  1268.                 decode_mb_i(h,0);

  1269.             } else {

  1270.                 decode_mb_p(h,mb_type);

  1271.             }

  1272.         } while(next_mb(h));

  1273.     } else { //FF_B_TYPE

  1274.         do {

  1275.             if(h->skip_mode_flag) {

  1276.                 skip_count = get_ue_golomb(&s->gb);

  1277.                 for(i=0;i<skip_count;i++) {

  1278.                     init_mb(h);

  1279.                     mb_skip_b(h);

  1280.                     inter_pred(h);

  1281.                     filter_mb(h,B_SKIP);

  1282.                     if(!next_mb(h))

  1283.                         goto done;

  1284.                 }

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

  1286.             } else {

  1287.                 mb_type = get_ue_golomb(&s->gb) + B_SKIP;

  1288.             }

  1289.             init_mb(h);

  1290.             if(mb_type > B_8X8) {

  1291.                 h->cbp = cbp_tab[mb_type - B_8X8 - 1][0];

  1292.                 decode_mb_i(h,0);

  1293.             } else {

  1294.                 decode_mb_b(h,mb_type);

  1295.             }

  1296.         } while(next_mb(h));

  1297.     }

  1298.  done:

  1299.     if(h->pic_type != FF_B_TYPE) {

  1300.         if(h->DPB[1].data[0])

  1301.             s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]);

  1302.         memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture));

  1303.         memcpy(&h->DPB[0], &h->picture, sizeof(Picture));

  1304.         memset(&h->picture,0,sizeof(Picture));

  1305.     }

  1306.     return 0;

  1307. }

  1308. 

  1309. /*****************************************************************************

  1310.  *

  1311.  * headers and interface

  1312.  *

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

  1314. 

  1315. static void init_top_lines(AVSContext *h) {

  1316.     /* alloc top line of predictors */

  1317.     h->top_qp       = av_malloc( h->mb_width);

  1318.     h->top_mv[0]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1319.     h->top_mv[1]    = av_malloc((h->mb_width*2+1)*sizeof(vector_t));

  1320.     h->top_pred_Y   = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));

  1321.     h->top_border_y = av_malloc((h->mb_width+1)*16);

  1322.     h->top_border_u = av_malloc((h->mb_width)*10);

  1323.     h->top_border_v = av_malloc((h->mb_width)*10);

  1324. 

  1325.     /* alloc space for co-located MVs and types */

  1326.     h->col_mv       = av_malloc( h->mb_width*h->mb_height*4*sizeof(vector_t));

  1327.     h->col_type_base = av_malloc(h->mb_width*h->mb_height);

  1328. }

  1329. 

  1330. static int decode_seq_header(AVSContext *h) {

  1331.     MpegEncContext *s = &h->s;

  1332.     extern const AVRational ff_frame_rate_tab[];

  1333.     int frame_rate_code;

  1334. 

  1335.     h->profile =         get_bits(&s->gb,8);

  1336.     h->level =           get_bits(&s->gb,8);

  1337.     skip_bits1(&s->gb); //progressive sequence

  1338.     s->width =           get_bits(&s->gb,14);

  1339.     s->height =          get_bits(&s->gb,14);

  1340.     skip_bits(&s->gb,2); //chroma format

  1341.     skip_bits(&s->gb,3); //sample_precision

  1342.     h->aspect_ratio =    get_bits(&s->gb,4);

  1343.     frame_rate_code =    get_bits(&s->gb,4);

  1344.     skip_bits(&s->gb,18);//bit_rate_lower

  1345.     skip_bits1(&s->gb);  //marker_bit

  1346.     skip_bits(&s->gb,12);//bit_rate_upper

  1347.     s->low_delay =       get_bits1(&s->gb);

  1348.     h->mb_width  = (s->width  + 15) >> 4;

  1349.     h->mb_height = (s->height + 15) >> 4;

  1350.     h->s.avctx->time_base.den = ff_frame_rate_tab[frame_rate_code].num;

  1351.     h->s.avctx->time_base.num = ff_frame_rate_tab[frame_rate_code].den;

  1352.     h->s.avctx->width  = s->width;

  1353.     h->s.avctx->height = s->height;

  1354.     if(!h->top_qp)

  1355.         init_top_lines(h);

  1356.     return 0;

  1357. }

  1358. 

  1359. /**

  1360.  * finds the end of the current frame in the bitstream.

  1361.  * @return the position of the first byte of the next frame, or -1

  1362.  */

  1363. int ff_cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) {

  1364.     int pic_found, i;

  1365.     uint32_t state;

  1366. 

  1367.     pic_found= pc->frame_start_found;

  1368.     state= pc->state;

  1369. 

  1370.     i=0;

  1371.     if(!pic_found){

  1372.         for(i=0; i<buf_size; i++){

  1373.             state= (state<<8) | buf[i];

  1374.             if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){

  1375.                 i++;

  1376.                 pic_found=1;

  1377.                 break;

  1378.             }

  1379.         }

  1380.     }

  1381. 

  1382.     if(pic_found){

  1383.         /* EOF considered as end of frame */

  1384.         if (buf_size == 0)

  1385.             return 0;

  1386.         for(; i<buf_size; i++){

  1387.             state= (state<<8) | buf[i];

  1388.             if((state&0xFFFFFF00) == 0x100){

  1389.                 if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){

  1390.                     pc->frame_start_found=0;

  1391.                     pc->state=-1;

  1392.                     return i-3;

  1393.                 }

  1394.             }

  1395.         }

  1396.     }

  1397.     pc->frame_start_found= pic_found;

  1398.     pc->state= state;

  1399.     return END_NOT_FOUND;

  1400. }

  1401. 

  1402. void ff_cavs_flush(AVCodecContext * avctx) {

  1403.     AVSContext *h = avctx->priv_data;

  1404.     h->got_keyframe = 0;

  1405. }

  1406. 

  1407. static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size,

  1408.                              uint8_t * buf, int buf_size) {

  1409.     AVSContext *h = avctx->priv_data;

  1410.     MpegEncContext *s = &h->s;

  1411.     int input_size;

  1412.     const uint8_t *buf_end;

  1413.     const uint8_t *buf_ptr;

  1414.     AVFrame *picture = data;

  1415.     uint32_t stc;

  1416. 

  1417.     s->avctx = avctx;

  1418. 

  1419.     if (buf_size == 0) {

  1420.         if(!s->low_delay && h->DPB[0].data[0]) {

  1421.             *data_size = sizeof(AVPicture);

  1422.             *picture = *(AVFrame *) &h->DPB[0];

  1423.         }

  1424.         return 0;

  1425.     }

  1426. 

  1427.     buf_ptr = buf;

  1428.     buf_end = buf + buf_size;

  1429.     for(;;) {

  1430.         buf_ptr = ff_find_start_code(buf_ptr,buf_end, &stc);

  1431.         if(stc & 0xFFFFFE00)

  1432.             return FFMAX(0, buf_ptr - buf - s->parse_context.last_index);

  1433.         input_size = (buf_end - buf_ptr)*8;

  1434.         switch(stc) {

  1435.         case SEQ_START_CODE:

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

  1437.             decode_seq_header(h);

  1438.             break;

  1439.         case PIC_I_START_CODE:

  1440.             if(!h->got_keyframe) {

  1441.                 if(h->DPB[0].data[0])

  1442.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[0]);

  1443.                 if(h->DPB[1].data[0])

  1444.                     avctx->release_buffer(avctx, (AVFrame *)&h->DPB[1]);

  1445.                 h->got_keyframe = 1;

  1446.             }

  1447.         case PIC_PB_START_CODE:

  1448.             *data_size = 0;

  1449.             if(!h->got_keyframe)

  1450.                 break;

  1451.             init_get_bits(&s->gb, buf_ptr, input_size);

  1452.             h->stc = stc;

  1453.             if(decode_pic(h))

  1454.                 break;

  1455.             *data_size = sizeof(AVPicture);

  1456.             if(h->pic_type != FF_B_TYPE) {

  1457.                 if(h->DPB[1].data[0]) {

  1458.                     *picture = *(AVFrame *) &h->DPB[1];

  1459.                 } else {

  1460.                     *data_size = 0;

  1461.                 }

  1462.             } else

  1463.                 *picture = *(AVFrame *) &h->picture;

  1464.             break;

  1465.         case EXT_START_CODE:

  1466.             //mpeg_decode_extension(avctx,buf_ptr, input_size);

  1467.             break;

  1468.         case USER_START_CODE:

  1469.             //mpeg_decode_user_data(avctx,buf_ptr, input_size);

  1470.             break;

  1471.         default:

  1472.             if (stc >= SLICE_MIN_START_CODE &&

  1473.                 stc <= SLICE_MAX_START_CODE) {

  1474.                 init_get_bits(&s->gb, buf_ptr, input_size);

  1475.                 decode_slice_header(h, &s->gb);

  1476.             }

  1477.             break;

  1478.         }

  1479.     }

  1480. }

  1481. 

  1482. static int cavs_decode_init(AVCodecContext * avctx) {

  1483.     AVSContext *h = avctx->priv_data;

  1484.     MpegEncContext * const s = &h->s;

  1485. 

  1486.     MPV_decode_defaults(s);

  1487.     s->avctx = avctx;

  1488. 

  1489.     avctx->pix_fmt= PIX_FMT_YUV420P;

  1490. 

  1491.     h->luma_scan[0] = 0;

  1492.     h->luma_scan[1] = 8;

  1493.     h->intra_pred_l[      INTRA_L_VERT] = intra_pred_vert;

  1494.     h->intra_pred_l[     INTRA_L_HORIZ] = intra_pred_horiz;

  1495.     h->intra_pred_l[        INTRA_L_LP] = intra_pred_lp;

  1496.     h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;

  1497.     h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;

  1498.     h->intra_pred_l[   INTRA_L_LP_LEFT] = intra_pred_lp_left;

  1499.     h->intra_pred_l[    INTRA_L_LP_TOP] = intra_pred_lp_top;

  1500.     h->intra_pred_l[    INTRA_L_DC_128] = intra_pred_dc_128;

  1501.     h->intra_pred_c[        INTRA_C_LP] = intra_pred_lp;

  1502.     h->intra_pred_c[     INTRA_C_HORIZ] = intra_pred_horiz;

  1503.     h->intra_pred_c[      INTRA_C_VERT] = intra_pred_vert;

  1504.     h->intra_pred_c[     INTRA_C_PLANE] = intra_pred_plane;

  1505.     h->intra_pred_c[   INTRA_C_LP_LEFT] = intra_pred_lp_left;

  1506.     h->intra_pred_c[    INTRA_C_LP_TOP] = intra_pred_lp_top;

  1507.     h->intra_pred_c[    INTRA_C_DC_128] = intra_pred_dc_128;

  1508.     h->mv[ 7] = un_mv;

  1509.     h->mv[19] = un_mv;

  1510.     return 0;

  1511. }

  1512. 

  1513. static int cavs_decode_end(AVCodecContext * avctx) {

  1514.     AVSContext *h = avctx->priv_data;

  1515. 

  1516.     av_free(h->top_qp);

  1517.     av_free(h->top_mv[0]);

  1518.     av_free(h->top_mv[1]);

  1519.     av_free(h->top_pred_Y);

  1520.     av_free(h->top_border_y);

  1521.     av_free(h->top_border_u);

  1522.     av_free(h->top_border_v);

  1523.     av_free(h->col_mv);

  1524.     av_free(h->col_type_base);

  1525.     return 0;

  1526. }

  1527. 

  1528. AVCodec cavs_decoder = {

  1529.     "cavs",

  1530.     CODEC_TYPE_VIDEO,

  1531.     CODEC_ID_CAVS,

  1532.     sizeof(AVSContext),

  1533.     cavs_decode_init,

  1534.     NULL,

  1535.     cavs_decode_end,

  1536.     cavs_decode_frame,

  1537.     CODEC_CAP_DR1 | CODEC_CAP_DELAY,

  1538.     .flush= ff_cavs_flush,

  1539. };