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* Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
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* Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
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* This file is part of FFmpeg.
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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* Chinese AVS video (AVS1-P2, JiZhun profile) decoder
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* @author Stefan Gehrer <stefan.gehrer@gmx.de>
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#include "bitstream.h"
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#include "mpegvideo.h"
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Picture picture; ///< currently decoded frame
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Picture DPB[2]; ///< reference frames
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int dist[2]; ///< temporal distances from current frame to ref frames
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int mb_width, mb_height;
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int skip_mode_flag; ///< select between skip_count or one skip_flag per MB
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int loop_filter_disable;
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int alpha_offset, beta_offset;
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int mbx, mby; ///< macroblock coordinates
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int flags; ///< availability flags of neighbouring macroblocks
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int stc; ///< last start code
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uint8_t *cy, *cu, *cv; ///< current MB sample pointers
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/** mv motion vector cache
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X are the vectors in the current macroblock (5,6,9,10)
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A is the macroblock to the left (4,8)
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B is the macroblock to the top (1,2)
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C is the macroblock to the top-right (3)
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D is the macroblock to the top-left (0)
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the same is repeated for backward motion vectors */
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/** luma pred mode cache
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int l_stride, c_stride;
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/** intra prediction is done with un-deblocked samples
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they are saved here before deblocking the MB */
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uint8_t *top_border_y, *top_border_u, *top_border_v;
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uint8_t left_border_y[26], left_border_u[10], left_border_v[10];
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uint8_t intern_border_y[26];
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uint8_t topleft_border_y, topleft_border_u, topleft_border_v;
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void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
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void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
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uint8_t *col_type_base;
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/* scaling factors for MV prediction */
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int sym_factor; ///< for scaling in symmetrical B block
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int direct_den[2]; ///< for scaling in direct B block
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int scale_den[2]; ///< for scaling neighbouring MVs
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/*****************************************************************************
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* in-loop deblocking filter
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****************************************************************************/
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static inline int get_bs(vector_t *mvP, vector_t *mvQ, int b) {
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if((mvP->ref == REF_INTRA) || (mvQ->ref == REF_INTRA))
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if( (abs(mvP->x - mvQ->x) >= 4) || (abs(mvP->y - mvQ->y) >= 4) )
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if( (abs(mvP->x - mvQ->x) >= 4) || (abs(mvP->y - mvQ->y) >= 4) )
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if(mvP->ref != mvQ->ref)
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alpha = alpha_tab[clip(qp_avg + h->alpha_offset,0,63)]; \
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beta = beta_tab[clip(qp_avg + h->beta_offset, 0,63)]; \
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tc = tc_tab[clip(qp_avg + h->alpha_offset,0,63)];
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* in-loop deblocking filter for a single macroblock
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* boundary strength (bs) mapping:
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static void filter_mb(AVSContext *h, enum mb_t mb_type) {
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DECLARE_ALIGNED_8(uint8_t, bs[8]);
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int qp_avg, alpha, beta, tc;
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/* save un-deblocked lines */
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h->topleft_border_y = h->top_border_y[h->mbx*16+15];
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h->topleft_border_u = h->top_border_u[h->mbx*10+8];
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h->topleft_border_v = h->top_border_v[h->mbx*10+8];
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memcpy(&h->top_border_y[h->mbx*16], h->cy + 15* h->l_stride,16);
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memcpy(&h->top_border_u[h->mbx*10+1], h->cu + 7* h->c_stride,8);
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memcpy(&h->top_border_v[h->mbx*10+1], h->cv + 7* h->c_stride,8);
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h->left_border_y[i*2+1] = *(h->cy + 15 + (i*2+0)*h->l_stride);
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h->left_border_y[i*2+2] = *(h->cy + 15 + (i*2+1)*h->l_stride);
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h->left_border_u[i+1] = *(h->cu + 7 + i*h->c_stride);
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h->left_border_v[i+1] = *(h->cv + 7 + i*h->c_stride);
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if(!h->loop_filter_disable) {
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*((uint64_t *)bs) = 0x0202020202020202ULL;
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*((uint64_t *)bs) = 0;
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if(partition_flags[mb_type] & SPLITV){
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bs[2] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1], mb_type > P_8X8);
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bs[3] = get_bs(&h->mv[MV_FWD_X2], &h->mv[MV_FWD_X3], mb_type > P_8X8);
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if(partition_flags[mb_type] & SPLITH){
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bs[6] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2], mb_type > P_8X8);
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bs[7] = get_bs(&h->mv[MV_FWD_X1], &h->mv[MV_FWD_X3], mb_type > P_8X8);
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bs[0] = get_bs(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0], mb_type > P_8X8);
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bs[1] = get_bs(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2], mb_type > P_8X8);
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bs[4] = get_bs(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0], mb_type > P_8X8);
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bs[5] = get_bs(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1], mb_type > P_8X8);
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if( *((uint64_t *)bs) ) {
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if(h->flags & A_AVAIL) {
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qp_avg = (h->qp + h->left_qp + 1) >> 1;
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h->s.dsp.cavs_filter_lv(h->cy,h->l_stride,alpha,beta,tc,bs[0],bs[1]);
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h->s.dsp.cavs_filter_cv(h->cu,h->c_stride,alpha,beta,tc,bs[0],bs[1]);
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h->s.dsp.cavs_filter_cv(h->cv,h->c_stride,alpha,beta,tc,bs[0],bs[1]);
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h->s.dsp.cavs_filter_lv(h->cy + 8,h->l_stride,alpha,beta,tc,bs[2],bs[3]);
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h->s.dsp.cavs_filter_lh(h->cy + 8*h->l_stride,h->l_stride,alpha,beta,tc,
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if(h->flags & B_AVAIL) {
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qp_avg = (h->qp + h->top_qp[h->mbx] + 1) >> 1;
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h->s.dsp.cavs_filter_lh(h->cy,h->l_stride,alpha,beta,tc,bs[4],bs[5]);
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h->s.dsp.cavs_filter_ch(h->cu,h->c_stride,alpha,beta,tc,bs[4],bs[5]);
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h->s.dsp.cavs_filter_ch(h->cv,h->c_stride,alpha,beta,tc,bs[4],bs[5]);
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h->top_qp[h->mbx] = h->qp;
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/*****************************************************************************
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* spatial intra prediction
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****************************************************************************/
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static inline void load_intra_pred_luma(AVSContext *h, uint8_t *top,
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uint8_t **left, int block) {
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*left = h->left_border_y;
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h->left_border_y[0] = h->left_border_y[1];
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memset(&h->left_border_y[17],h->left_border_y[16],9);
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memcpy(&top[1],&h->top_border_y[h->mbx*16],16);
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if((h->flags & A_AVAIL) && (h->flags & B_AVAIL))
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h->left_border_y[0] = top[0] = h->topleft_border_y;
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*left = h->intern_border_y;
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h->intern_border_y[i+1] = *(h->cy + 7 + i*h->l_stride);
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memset(&h->intern_border_y[9],h->intern_border_y[8],9);
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h->intern_border_y[0] = h->intern_border_y[1];
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memcpy(&top[1],&h->top_border_y[h->mbx*16+8],8);
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if(h->flags & C_AVAIL)
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memcpy(&top[9],&h->top_border_y[(h->mbx + 1)*16],8);
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memset(&top[9],top[8],9);
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if(h->flags & B_AVAIL)
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h->intern_border_y[0] = top[0] = h->top_border_y[h->mbx*16+7];
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*left = &h->left_border_y[8];
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memcpy(&top[1],h->cy + 7*h->l_stride,16);
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if(h->flags & A_AVAIL)
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top[0] = h->left_border_y[8];
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*left = &h->intern_border_y[8];
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h->intern_border_y[i+9] = *(h->cy + 7 + (i+8)*h->l_stride);
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memset(&h->intern_border_y[17],h->intern_border_y[16],9);
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memcpy(&top[0],h->cy + 7 + 7*h->l_stride,9);
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memset(&top[9],top[8],9);
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static void intra_pred_vert(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
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uint64_t a = unaligned64(&top[1]);
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*((uint64_t *)(d+y*stride)) = a;
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static void intra_pred_horiz(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
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a = left[y+1] * 0x0101010101010101ULL;
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*((uint64_t *)(d+y*stride)) = a;
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static void intra_pred_dc_128(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
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uint64_t a = 0x8080808080808080ULL;
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*((uint64_t *)(d+y*stride)) = a;
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static void intra_pred_plane(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
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uint8_t *cm = cropTbl + MAX_NEG_CROP;
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ih += (x+1)*(top[5+x]-top[3-x]);
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iv += (x+1)*(left[5+x]-left[3-x]);
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ia = (top[8]+left[8])<<4;
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d[y*stride+x] = cm[(ia+(x-3)*ih+(y-3)*iv+16)>>5];
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#define LOWPASS(ARRAY,INDEX) \
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(( ARRAY[(INDEX)-1] + 2*ARRAY[(INDEX)] + ARRAY[(INDEX)+1] + 2) >> 2)
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static void intra_pred_lp(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
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d[y*stride+x] = (LOWPASS(top,x+1) + LOWPASS(left,y+1)) >> 1;
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static void intra_pred_down_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
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d[y*stride+x] = (LOWPASS(top,x+y+2) + LOWPASS(left,x+y+2)) >> 1;
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static void intra_pred_down_right(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
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d[y*stride+x] = (left[1]+2*top[0]+top[1]+2)>>2;
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d[y*stride+x] = LOWPASS(top,x-y);
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d[y*stride+x] = LOWPASS(left,y-x);
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static void intra_pred_lp_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
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d[y*stride+x] = LOWPASS(left,y+1);
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static void intra_pred_lp_top(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
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d[y*stride+x] = LOWPASS(top,x+1);
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static inline void modify_pred(const int_fast8_t *mod_table, int *mode) {
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*mode = mod_table[*mode];
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av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n");
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/*****************************************************************************
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* motion compensation
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****************************************************************************/
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static inline void mc_dir_part(AVSContext *h,Picture *pic,int square,
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int chroma_height,int delta,int list,uint8_t *dest_y,
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uint8_t *dest_cb,uint8_t *dest_cr,int src_x_offset,
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int src_y_offset,qpel_mc_func *qpix_op,
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h264_chroma_mc_func chroma_op,vector_t *mv){
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MpegEncContext * const s = &h->s;
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const int mx= mv->x + src_x_offset*8;
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const int my= mv->y + src_y_offset*8;
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const int luma_xy= (mx&3) + ((my&3)<<2);
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uint8_t * src_y = pic->data[0] + (mx>>2) + (my>>2)*h->l_stride;
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uint8_t * src_cb= pic->data[1] + (mx>>3) + (my>>3)*h->c_stride;
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uint8_t * src_cr= pic->data[2] + (mx>>3) + (my>>3)*h->c_stride;
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int extra_width= 0; //(s->flags&CODEC_FLAG_EMU_EDGE) ? 0 : 16;
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int extra_height= extra_width;
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const int full_mx= mx>>2;
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const int full_my= my>>2;
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const int pic_width = 16*h->mb_width;
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const int pic_height = 16*h->mb_height;
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if(mx&7) extra_width -= 3;
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if(my&7) extra_height -= 3;
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if( full_mx < 0-extra_width
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|| full_my < 0-extra_height
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|| full_mx + 16/*FIXME*/ > pic_width + extra_width
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|| full_my + 16/*FIXME*/ > pic_height + extra_height){
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ff_emulated_edge_mc(s->edge_emu_buffer, src_y - 2 - 2*h->l_stride, h->l_stride,
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16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);
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src_y= s->edge_emu_buffer + 2 + 2*h->l_stride;
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qpix_op[luma_xy](dest_y, src_y, h->l_stride); //FIXME try variable height perhaps?
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qpix_op[luma_xy](dest_y + delta, src_y + delta, h->l_stride);
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ff_emulated_edge_mc(s->edge_emu_buffer, src_cb, h->c_stride,
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9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);
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src_cb= s->edge_emu_buffer;
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chroma_op(dest_cb, src_cb, h->c_stride, chroma_height, mx&7, my&7);
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ff_emulated_edge_mc(s->edge_emu_buffer, src_cr, h->c_stride,
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9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);
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src_cr= s->edge_emu_buffer;
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chroma_op(dest_cr, src_cr, h->c_stride, chroma_height, mx&7, my&7);
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static inline void mc_part_std(AVSContext *h,int square,int chroma_height,int delta,
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uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,
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int x_offset, int y_offset,qpel_mc_func *qpix_put,
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h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,
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h264_chroma_mc_func chroma_avg, vector_t *mv){
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qpel_mc_func *qpix_op= qpix_put;
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h264_chroma_mc_func chroma_op= chroma_put;
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dest_y += 2*x_offset + 2*y_offset*h->l_stride;
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dest_cb += x_offset + y_offset*h->c_stride;
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dest_cr += x_offset + y_offset*h->c_stride;
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x_offset += 8*h->mbx;
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y_offset += 8*h->mby;
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Picture *ref= &h->DPB[mv->ref];
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mc_dir_part(h, ref, square, chroma_height, delta, 0,
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dest_y, dest_cb, dest_cr, x_offset, y_offset,
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qpix_op, chroma_op, mv);
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chroma_op= chroma_avg;
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if((mv+MV_BWD_OFFS)->ref >= 0){
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Picture *ref= &h->DPB[0];
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mc_dir_part(h, ref, square, chroma_height, delta, 1,
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dest_y, dest_cb, dest_cr, x_offset, y_offset,
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qpix_op, chroma_op, mv+MV_BWD_OFFS);
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static void inter_pred(AVSContext *h, enum mb_t mb_type) {
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if(partition_flags[mb_type] == 0){ // 16x16
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mc_part_std(h, 1, 8, 0, h->cy, h->cu, h->cv, 0, 0,
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h->s.dsp.put_cavs_qpel_pixels_tab[0],
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h->s.dsp.put_h264_chroma_pixels_tab[0],
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h->s.dsp.avg_cavs_qpel_pixels_tab[0],
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h->s.dsp.avg_h264_chroma_pixels_tab[0],&h->mv[MV_FWD_X0]);
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mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 0,
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h->s.dsp.put_cavs_qpel_pixels_tab[1],
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h->s.dsp.put_h264_chroma_pixels_tab[1],
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h->s.dsp.avg_cavs_qpel_pixels_tab[1],
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h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X0]);
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mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 0,
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h->s.dsp.put_cavs_qpel_pixels_tab[1],
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h->s.dsp.put_h264_chroma_pixels_tab[1],
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h->s.dsp.avg_cavs_qpel_pixels_tab[1],
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h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X1]);
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mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 4,
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h->s.dsp.put_cavs_qpel_pixels_tab[1],
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h->s.dsp.put_h264_chroma_pixels_tab[1],
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h->s.dsp.avg_cavs_qpel_pixels_tab[1],
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h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X2]);
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mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 4,
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h->s.dsp.put_cavs_qpel_pixels_tab[1],
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h->s.dsp.put_h264_chroma_pixels_tab[1],
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h->s.dsp.avg_cavs_qpel_pixels_tab[1],
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h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X3]);
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/* set intra prediction modes to default values */
486
h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP;
487
h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP;
490
/*****************************************************************************
492
* motion vector prediction
494
****************************************************************************/
496
static inline void set_mvs(vector_t *mv, enum block_t size) {
499
mv[MV_STRIDE ] = mv[0];
500
mv[MV_STRIDE+1] = mv[0];
505
mv[MV_STRIDE] = mv[0];
510
static inline void store_mvs(AVSContext *h) {
511
h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 0] = h->mv[MV_FWD_X0];
512
h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 1] = h->mv[MV_FWD_X1];
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h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 2] = h->mv[MV_FWD_X2];
514
h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 3] = h->mv[MV_FWD_X3];
517
static inline void scale_mv(AVSContext *h, int *d_x, int *d_y, vector_t *src, int distp) {
518
int den = h->scale_den[src->ref];
520
*d_x = (src->x*distp*den + 256 + (src->x>>31)) >> 9;
521
*d_y = (src->y*distp*den + 256 + (src->y>>31)) >> 9;
524
static inline void mv_pred_median(AVSContext *h, vector_t *mvP, vector_t *mvA, vector_t *mvB, vector_t *mvC) {
525
int ax, ay, bx, by, cx, cy;
526
int len_ab, len_bc, len_ca, len_mid;
528
/* scale candidates according to their temporal span */
529
scale_mv(h, &ax, &ay, mvA, mvP->dist);
530
scale_mv(h, &bx, &by, mvB, mvP->dist);
531
scale_mv(h, &cx, &cy, mvC, mvP->dist);
532
/* find the geometrical median of the three candidates */
533
len_ab = abs(ax - bx) + abs(ay - by);
534
len_bc = abs(bx - cx) + abs(by - cy);
535
len_ca = abs(cx - ax) + abs(cy - ay);
536
len_mid = mid_pred(len_ab, len_bc, len_ca);
537
if(len_mid == len_ab) {
540
} else if(len_mid == len_bc) {
549
static inline void mv_pred_direct(AVSContext *h, vector_t *pmv_fw,
551
vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS;
552
int den = h->direct_den[col_mv->ref];
553
int m = col_mv->x >> 31;
555
pmv_fw->dist = h->dist[1];
556
pmv_bw->dist = h->dist[0];
559
/* scale the co-located motion vector according to its temporal span */
560
pmv_fw->x = (((den+(den*col_mv->x*pmv_fw->dist^m)-m-1)>>14)^m)-m;
561
pmv_bw->x = m-(((den+(den*col_mv->x*pmv_bw->dist^m)-m-1)>>14)^m);
563
pmv_fw->y = (((den+(den*col_mv->y*pmv_fw->dist^m)-m-1)>>14)^m)-m;
564
pmv_bw->y = m-(((den+(den*col_mv->y*pmv_bw->dist^m)-m-1)>>14)^m);
567
static inline void mv_pred_sym(AVSContext *h, vector_t *src, enum block_t size) {
568
vector_t *dst = src + MV_BWD_OFFS;
570
/* backward mv is the scaled and negated forward mv */
571
dst->x = -((src->x * h->sym_factor + 256) >> 9);
572
dst->y = -((src->y * h->sym_factor + 256) >> 9);
574
dst->dist = h->dist[0];
578
static void mv_pred(AVSContext *h, enum mv_loc_t nP, enum mv_loc_t nC,
579
enum mv_pred_t mode, enum block_t size, int ref) {
580
vector_t *mvP = &h->mv[nP];
581
vector_t *mvA = &h->mv[nP-1];
582
vector_t *mvB = &h->mv[nP-4];
583
vector_t *mvC = &h->mv[nC];
584
const vector_t *mvP2 = NULL;
587
mvP->dist = h->dist[mvP->ref];
588
if(mvC->ref == NOT_AVAIL)
589
mvC = &h->mv[nP-5]; // set to top-left (mvD)
590
if((mode == MV_PRED_PSKIP) &&
591
((mvA->ref == NOT_AVAIL) || (mvB->ref == NOT_AVAIL) ||
592
((mvA->x | mvA->y | mvA->ref) == 0) ||
593
((mvB->x | mvB->y | mvB->ref) == 0) )) {
595
/* if there is only one suitable candidate, take it */
596
} else if((mvA->ref >= 0) && (mvB->ref < 0) && (mvC->ref < 0)) {
598
} else if((mvA->ref < 0) && (mvB->ref >= 0) && (mvC->ref < 0)) {
600
} else if((mvA->ref < 0) && (mvB->ref < 0) && (mvC->ref >= 0)) {
602
} else if(mode == MV_PRED_LEFT && mvA->ref == ref){
604
} else if(mode == MV_PRED_TOP && mvB->ref == ref){
606
} else if(mode == MV_PRED_TOPRIGHT && mvC->ref == ref){
613
mv_pred_median(h, mvP, mvA, mvB, mvC);
615
if(mode < MV_PRED_PSKIP) {
616
mvP->x += get_se_golomb(&h->s.gb);
617
mvP->y += get_se_golomb(&h->s.gb);
622
/*****************************************************************************
624
* residual data decoding
626
****************************************************************************/
628
/** kth-order exponential golomb code */
629
static inline int get_ue_code(GetBitContext *gb, int order) {
631
int ret = get_ue_golomb(gb) << order;
632
return ret + get_bits(gb,order);
634
return get_ue_golomb(gb);
638
* decode coefficients from one 8x8 block, dequantize, inverse transform
639
* and add them to sample block
640
* @param r pointer to 2D VLC table
641
* @param esc_golomb_order escape codes are k-golomb with this order k
642
* @param qp quantizer
643
* @param dst location of sample block
644
* @param stride line stride in frame buffer
646
static int decode_residual_block(AVSContext *h, GetBitContext *gb,
647
const residual_vlc_t *r, int esc_golomb_order,
648
int qp, uint8_t *dst, int stride) {
650
int level_code, esc_code, level, run, mask;
653
int dqm = dequant_mul[qp];
654
int dqs = dequant_shift[qp];
655
int dqa = 1 << (dqs - 1);
656
const uint8_t *scantab = h->scantable.permutated;
657
DCTELEM *block = h->block;
660
level_code = get_ue_code(gb,r->golomb_order);
661
if(level_code >= ESCAPE_CODE) {
662
run = ((level_code - ESCAPE_CODE) >> 1) + 1;
663
esc_code = get_ue_code(gb,esc_golomb_order);
664
level = esc_code + (run > r->max_run ? 1 : r->level_add[run]);
665
while(level > r->inc_limit)
667
mask = -(level_code & 1);
668
level = (level^mask) - mask;
670
level = r->rltab[level_code][0];
671
if(!level) //end of block signal
673
run = r->rltab[level_code][1];
674
r += r->rltab[level_code][2];
676
level_buf[i] = level;
679
/* inverse scan and dequantization */
683
av_log(h->s.avctx, AV_LOG_ERROR,
684
"position out of block bounds at pic %d MB(%d,%d)\n",
685
h->picture.poc, h->mbx, h->mby);
688
block[scantab[pos]] = (level_buf[i]*dqm + dqa) >> dqs;
690
h->s.dsp.cavs_idct8_add(dst,block,stride);
695
static inline void decode_residual_chroma(AVSContext *h) {
697
decode_residual_block(h,&h->s.gb,chroma_2dvlc,0, chroma_qp[h->qp],
700
decode_residual_block(h,&h->s.gb,chroma_2dvlc,0, chroma_qp[h->qp],
704
static inline int decode_residual_inter(AVSContext *h) {
707
/* get coded block pattern */
708
int cbp= get_ue_golomb(&h->s.gb);
710
av_log(h->s.avctx, AV_LOG_ERROR, "illegal inter cbp\n");
713
h->cbp = cbp_tab[cbp][1];
716
if(h->cbp && !h->qp_fixed)
717
h->qp = (h->qp + get_se_golomb(&h->s.gb)) & 63;
718
for(block=0;block<4;block++)
719
if(h->cbp & (1<<block))
720
decode_residual_block(h,&h->s.gb,inter_2dvlc,0,h->qp,
721
h->cy + h->luma_scan[block], h->l_stride);
722
decode_residual_chroma(h);
727
/*****************************************************************************
731
****************************************************************************/
734
* initialise predictors for motion vectors and intra prediction
736
static inline void init_mb(AVSContext *h) {
739
/* copy predictors from top line (MB B and C) into cache */
741
h->mv[MV_FWD_B2+i] = h->top_mv[0][h->mbx*2+i];
742
h->mv[MV_BWD_B2+i] = h->top_mv[1][h->mbx*2+i];
744
h->pred_mode_Y[1] = h->top_pred_Y[h->mbx*2+0];
745
h->pred_mode_Y[2] = h->top_pred_Y[h->mbx*2+1];
746
/* clear top predictors if MB B is not available */
747
if(!(h->flags & B_AVAIL)) {
748
h->mv[MV_FWD_B2] = un_mv;
749
h->mv[MV_FWD_B3] = un_mv;
750
h->mv[MV_BWD_B2] = un_mv;
751
h->mv[MV_BWD_B3] = un_mv;
752
h->pred_mode_Y[1] = h->pred_mode_Y[2] = NOT_AVAIL;
753
h->flags &= ~(C_AVAIL|D_AVAIL);
757
if(h->mbx == h->mb_width-1) //MB C not available
758
h->flags &= ~C_AVAIL;
759
/* clear top-right predictors if MB C is not available */
760
if(!(h->flags & C_AVAIL)) {
761
h->mv[MV_FWD_C2] = un_mv;
762
h->mv[MV_BWD_C2] = un_mv;
764
/* clear top-left predictors if MB D is not available */
765
if(!(h->flags & D_AVAIL)) {
766
h->mv[MV_FWD_D3] = un_mv;
767
h->mv[MV_BWD_D3] = un_mv;
769
/* set pointer for co-located macroblock type */
770
h->col_type = &h->col_type_base[h->mby*h->mb_width + h->mbx];
773
static inline void check_for_slice(AVSContext *h);
776
* save predictors for later macroblocks and increase
778
* @returns 0 if end of frame is reached, 1 otherwise
780
static inline int next_mb(AVSContext *h) {
787
/* copy mvs as predictors to the left */
789
h->mv[i] = h->mv[i+2];
790
/* copy bottom mvs from cache to top line */
791
h->top_mv[0][h->mbx*2+0] = h->mv[MV_FWD_X2];
792
h->top_mv[0][h->mbx*2+1] = h->mv[MV_FWD_X3];
793
h->top_mv[1][h->mbx*2+0] = h->mv[MV_BWD_X2];
794
h->top_mv[1][h->mbx*2+1] = h->mv[MV_BWD_X3];
795
/* next MB address */
797
if(h->mbx == h->mb_width) { //new mb line
798
h->flags = B_AVAIL|C_AVAIL;
799
/* clear left pred_modes */
800
h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
801
/* clear left mv predictors */
806
/* re-calculate sample pointers */
807
h->cy = h->picture.data[0] + h->mby*16*h->l_stride;
808
h->cu = h->picture.data[1] + h->mby*8*h->c_stride;
809
h->cv = h->picture.data[2] + h->mby*8*h->c_stride;
810
if(h->mby == h->mb_height) { //frame end
813
//check_for_slice(h);
819
static int decode_mb_i(AVSContext *h, int cbp_code) {
820
GetBitContext *gb = &h->s.gb;
821
int block, pred_mode_uv;
823
uint8_t *left = NULL;
828
/* get intra prediction modes from stream */
829
for(block=0;block<4;block++) {
831
int pos = scan3x3[block];
833
nA = h->pred_mode_Y[pos-1];
834
nB = h->pred_mode_Y[pos-3];
835
predpred = FFMIN(nA,nB);
836
if(predpred == NOT_AVAIL) // if either is not available
837
predpred = INTRA_L_LP;
839
int rem_mode= get_bits(gb, 2);
840
predpred = rem_mode + (rem_mode >= predpred);
842
h->pred_mode_Y[pos] = predpred;
844
pred_mode_uv = get_ue_golomb(gb);
845
if(pred_mode_uv > 6) {
846
av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");
850
/* save pred modes before they get modified */
851
h->pred_mode_Y[3] = h->pred_mode_Y[5];
852
h->pred_mode_Y[6] = h->pred_mode_Y[8];
853
h->top_pred_Y[h->mbx*2+0] = h->pred_mode_Y[7];
854
h->top_pred_Y[h->mbx*2+1] = h->pred_mode_Y[8];
856
/* modify pred modes according to availability of neighbour samples */
857
if(!(h->flags & A_AVAIL)) {
858
modify_pred(left_modifier_l, &h->pred_mode_Y[4] );
859
modify_pred(left_modifier_l, &h->pred_mode_Y[7] );
860
modify_pred(left_modifier_c, &pred_mode_uv );
862
if(!(h->flags & B_AVAIL)) {
863
modify_pred(top_modifier_l, &h->pred_mode_Y[4] );
864
modify_pred(top_modifier_l, &h->pred_mode_Y[5] );
865
modify_pred(top_modifier_c, &pred_mode_uv );
868
/* get coded block pattern */
869
if(h->pic_type == FF_I_TYPE)
870
cbp_code = get_ue_golomb(gb);
872
av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra cbp\n");
875
h->cbp = cbp_tab[cbp_code][0];
876
if(h->cbp && !h->qp_fixed)
877
h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta
879
/* luma intra prediction interleaved with residual decode/transform/add */
880
for(block=0;block<4;block++) {
881
d = h->cy + h->luma_scan[block];
882
load_intra_pred_luma(h, top, &left, block);
883
h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]]
884
(d, top, left, h->l_stride);
885
if(h->cbp & (1<<block))
886
decode_residual_block(h,gb,intra_2dvlc,1,h->qp,d,h->l_stride);
889
/* chroma intra prediction */
890
/* extend borders by one pixel */
891
h->left_border_u[9] = h->left_border_u[8];
892
h->left_border_v[9] = h->left_border_v[8];
893
h->top_border_u[h->mbx*10+9] = h->top_border_u[h->mbx*10+8];
894
h->top_border_v[h->mbx*10+9] = h->top_border_v[h->mbx*10+8];
895
if(h->mbx && h->mby) {
896
h->top_border_u[h->mbx*10] = h->left_border_u[0] = h->topleft_border_u;
897
h->top_border_v[h->mbx*10] = h->left_border_v[0] = h->topleft_border_v;
899
h->left_border_u[0] = h->left_border_u[1];
900
h->left_border_v[0] = h->left_border_v[1];
901
h->top_border_u[h->mbx*10] = h->top_border_u[h->mbx*10+1];
902
h->top_border_v[h->mbx*10] = h->top_border_v[h->mbx*10+1];
904
h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx*10],
905
h->left_border_u, h->c_stride);
906
h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx*10],
907
h->left_border_v, h->c_stride);
909
decode_residual_chroma(h);
912
/* mark motion vectors as intra */
913
h->mv[MV_FWD_X0] = intra_mv;
914
set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
915
h->mv[MV_BWD_X0] = intra_mv;
916
set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
917
if(h->pic_type != FF_B_TYPE)
918
*h->col_type = I_8X8;
923
static void decode_mb_p(AVSContext *h, enum mb_t mb_type) {
924
GetBitContext *gb = &h->s.gb;
930
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0);
933
ref[0] = h->ref_flag ? 0 : get_bits1(gb);
934
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16,ref[0]);
937
ref[0] = h->ref_flag ? 0 : get_bits1(gb);
938
ref[2] = h->ref_flag ? 0 : get_bits1(gb);
939
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]);
940
mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]);
943
ref[0] = h->ref_flag ? 0 : get_bits1(gb);
944
ref[1] = h->ref_flag ? 0 : get_bits1(gb);
945
mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]);
946
mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]);
949
ref[0] = h->ref_flag ? 0 : get_bits1(gb);
950
ref[1] = h->ref_flag ? 0 : get_bits1(gb);
951
ref[2] = h->ref_flag ? 0 : get_bits1(gb);
952
ref[3] = h->ref_flag ? 0 : get_bits1(gb);
953
mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]);
954
mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]);
955
mv_pred(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]);
956
mv_pred(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]);
958
inter_pred(h, mb_type);
960
if(mb_type != P_SKIP)
961
decode_residual_inter(h);
962
filter_mb(h,mb_type);
963
*h->col_type = mb_type;
966
static void decode_mb_b(AVSContext *h, enum mb_t mb_type) {
968
enum sub_mb_t sub_type[4];
974
h->mv[MV_FWD_X0] = dir_mv;
975
set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
976
h->mv[MV_BWD_X0] = dir_mv;
977
set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
981
if(!(*h->col_type)) {
982
/* intra MB at co-location, do in-plane prediction */
983
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);
984
mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);
986
/* direct prediction from co-located P MB, block-wise */
987
for(block=0;block<4;block++)
988
mv_pred_direct(h,&h->mv[mv_scan[block]],
989
&h->col_mv[(h->mby*h->mb_width+h->mbx)*4 + block]);
992
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
995
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
996
mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);
999
mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);
1002
for(block=0;block<4;block++)
1003
sub_type[block] = get_bits(&h->s.gb,2);
1004
for(block=0;block<4;block++) {
1005
switch(sub_type[block]) {
1007
if(!(*h->col_type)) {
1008
/* intra MB at co-location, do in-plane prediction */
1009
mv_pred(h, mv_scan[block], mv_scan[block]-3,
1010
MV_PRED_BSKIP, BLK_8X8, 1);
1011
mv_pred(h, mv_scan[block]+MV_BWD_OFFS,
1012
mv_scan[block]-3+MV_BWD_OFFS,
1013
MV_PRED_BSKIP, BLK_8X8, 0);
1015
mv_pred_direct(h,&h->mv[mv_scan[block]],
1016
&h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]);
1019
mv_pred(h, mv_scan[block], mv_scan[block]-3,
1020
MV_PRED_MEDIAN, BLK_8X8, 1);
1023
mv_pred(h, mv_scan[block], mv_scan[block]-3,
1024
MV_PRED_MEDIAN, BLK_8X8, 1);
1025
mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);
1029
for(block=0;block<4;block++) {
1030
if(sub_type[block] == B_SUB_BWD)
1031
mv_pred(h, mv_scan[block]+MV_BWD_OFFS,
1032
mv_scan[block]+MV_BWD_OFFS-3,
1033
MV_PRED_MEDIAN, BLK_8X8, 0);
1037
assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));
1038
flags = partition_flags[mb_type];
1039
if(mb_type & 1) { /* 16x8 macroblock types */
1041
mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, 1);
1043
mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);
1045
mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);
1047
mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);
1049
mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, 0);
1051
mv_pred(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);
1052
} else { /* 8x16 macroblock types */
1054
mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);
1056
mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);
1058
mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1);
1060
mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);
1062
mv_pred(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);
1064
mv_pred(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 0);
1067
inter_pred(h, mb_type);
1068
if(mb_type != B_SKIP)
1069
decode_residual_inter(h);
1070
filter_mb(h,mb_type);
1073
/*****************************************************************************
1077
****************************************************************************/
1079
static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {
1081
av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);
1083
if((h->mby == 0) && (!h->qp_fixed)){
1084
h->qp_fixed = get_bits1(gb);
1085
h->qp = get_bits(gb,6);
1087
/* inter frame or second slice can have weighting params */
1088
if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2))
1089
if(get_bits1(gb)) { //slice_weighting_flag
1090
av_log(h->s.avctx, AV_LOG_ERROR,
1091
"weighted prediction not yet supported\n");
1096
static inline void check_for_slice(AVSContext *h) {
1097
GetBitContext *gb = &h->s.gb;
1099
align = (-get_bits_count(gb)) & 7;
1100
if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {
1101
get_bits_long(gb,24+align);
1102
h->stc = get_bits(gb,8);
1103
decode_slice_header(h,gb);
1107
/*****************************************************************************
1111
****************************************************************************/
1113
static void init_pic(AVSContext *h) {
1116
/* clear some predictors */
1119
h->mv[MV_BWD_X0] = dir_mv;
1120
set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
1121
h->mv[MV_FWD_X0] = dir_mv;
1122
set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
1123
h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
1124
h->cy = h->picture.data[0];
1125
h->cu = h->picture.data[1];
1126
h->cv = h->picture.data[2];
1127
h->l_stride = h->picture.linesize[0];
1128
h->c_stride = h->picture.linesize[1];
1129
h->luma_scan[2] = 8*h->l_stride;
1130
h->luma_scan[3] = 8*h->l_stride+8;
1131
h->mbx = h->mby = 0;
1135
static int decode_pic(AVSContext *h) {
1136
MpegEncContext *s = &h->s;
1140
if (!s->context_initialized) {
1141
s->avctx->idct_algo = FF_IDCT_CAVS;
1142
if (MPV_common_init(s) < 0)
1144
ff_init_scantable(s->dsp.idct_permutation,&h->scantable,ff_zigzag_direct);
1146
get_bits(&s->gb,16);//bbv_dwlay
1147
if(h->stc == PIC_PB_START_CODE) {
1148
h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE;
1149
if(h->pic_type > FF_B_TYPE) {
1150
av_log(s->avctx, AV_LOG_ERROR, "illegal picture type\n");
1153
/* make sure we have the reference frames we need */
1154
if(!h->DPB[0].data[0] ||
1155
(!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE))
1158
h->pic_type = FF_I_TYPE;
1159
if(get_bits1(&s->gb))
1160
get_bits(&s->gb,16);//time_code
1162
/* release last B frame */
1163
if(h->picture.data[0])
1164
s->avctx->release_buffer(s->avctx, (AVFrame *)&h->picture);
1166
s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture);
1168
h->picture.poc = get_bits(&s->gb,8)*2;
1170
/* get temporal distances and MV scaling factors */
1171
if(h->pic_type != FF_B_TYPE) {
1172
h->dist[0] = (h->picture.poc - h->DPB[0].poc + 512) % 512;
1174
h->dist[0] = (h->DPB[0].poc - h->picture.poc + 512) % 512;
1176
h->dist[1] = (h->picture.poc - h->DPB[1].poc + 512) % 512;
1177
h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;
1178
h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;
1179
if(h->pic_type == FF_B_TYPE) {
1180
h->sym_factor = h->dist[0]*h->scale_den[1];
1182
h->direct_den[0] = h->dist[0] ? 16384/h->dist[0] : 0;
1183
h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0;
1187
get_ue_golomb(&s->gb); //bbv_check_times
1188
h->progressive = get_bits1(&s->gb);
1190
h->pic_structure = 1;
1191
else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) )
1192
get_bits1(&s->gb); //advanced_pred_mode_disable
1193
skip_bits1(&s->gb); //top_field_first
1194
skip_bits1(&s->gb); //repeat_first_field
1195
h->qp_fixed = get_bits1(&s->gb);
1196
h->qp = get_bits(&s->gb,6);
1197
if(h->pic_type == FF_I_TYPE) {
1198
if(!h->progressive && !h->pic_structure)
1199
skip_bits1(&s->gb);//what is this?
1200
skip_bits(&s->gb,4); //reserved bits
1202
if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1))
1203
h->ref_flag = get_bits1(&s->gb);
1204
skip_bits(&s->gb,4); //reserved bits
1205
h->skip_mode_flag = get_bits1(&s->gb);
1207
h->loop_filter_disable = get_bits1(&s->gb);
1208
if(!h->loop_filter_disable && get_bits1(&s->gb)) {
1209
h->alpha_offset = get_se_golomb(&s->gb);
1210
h->beta_offset = get_se_golomb(&s->gb);
1212
h->alpha_offset = h->beta_offset = 0;
1215
if(h->pic_type == FF_I_TYPE) {
1218
} while(next_mb(h));
1219
} else if(h->pic_type == FF_P_TYPE) {
1221
if(h->skip_mode_flag) {
1222
skip_count = get_ue_golomb(&s->gb);
1223
while(skip_count--) {
1224
decode_mb_p(h,P_SKIP);
1228
mb_type = get_ue_golomb(&s->gb) + P_16X16;
1230
mb_type = get_ue_golomb(&s->gb) + P_SKIP;
1231
if(mb_type > P_8X8) {
1232
decode_mb_i(h, mb_type - P_8X8 - 1);
1234
decode_mb_p(h,mb_type);
1235
} while(next_mb(h));
1236
} else { /* FF_B_TYPE */
1238
if(h->skip_mode_flag) {
1239
skip_count = get_ue_golomb(&s->gb);
1240
while(skip_count--) {
1241
decode_mb_b(h,B_SKIP);
1245
mb_type = get_ue_golomb(&s->gb) + B_DIRECT;
1247
mb_type = get_ue_golomb(&s->gb) + B_SKIP;
1248
if(mb_type > B_8X8) {
1249
decode_mb_i(h, mb_type - B_8X8 - 1);
1251
decode_mb_b(h,mb_type);
1252
} while(next_mb(h));
1255
if(h->pic_type != FF_B_TYPE) {
1256
if(h->DPB[1].data[0])
1257
s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]);
1258
memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture));
1259
memcpy(&h->DPB[0], &h->picture, sizeof(Picture));
1260
memset(&h->picture,0,sizeof(Picture));
1265
/*****************************************************************************
1267
* headers and interface
1269
****************************************************************************/
1272
* some predictions require data from the top-neighbouring macroblock.
1273
* this data has to be stored for one complete row of macroblocks
1274
* and this storage space is allocated here
1276
static void init_top_lines(AVSContext *h) {
1277
/* alloc top line of predictors */
1278
h->top_qp = av_malloc( h->mb_width);
1279
h->top_mv[0] = av_malloc((h->mb_width*2+1)*sizeof(vector_t));
1280
h->top_mv[1] = av_malloc((h->mb_width*2+1)*sizeof(vector_t));
1281
h->top_pred_Y = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));
1282
h->top_border_y = av_malloc((h->mb_width+1)*16);
1283
h->top_border_u = av_malloc((h->mb_width)*10);
1284
h->top_border_v = av_malloc((h->mb_width)*10);
1286
/* alloc space for co-located MVs and types */
1287
h->col_mv = av_malloc( h->mb_width*h->mb_height*4*sizeof(vector_t));
1288
h->col_type_base = av_malloc(h->mb_width*h->mb_height);
1289
h->block = av_mallocz(64*sizeof(DCTELEM));
1292
static int decode_seq_header(AVSContext *h) {
1293
MpegEncContext *s = &h->s;
1294
extern const AVRational ff_frame_rate_tab[];
1295
int frame_rate_code;
1297
h->profile = get_bits(&s->gb,8);
1298
h->level = get_bits(&s->gb,8);
1299
skip_bits1(&s->gb); //progressive sequence
1300
s->width = get_bits(&s->gb,14);
1301
s->height = get_bits(&s->gb,14);
1302
skip_bits(&s->gb,2); //chroma format
1303
skip_bits(&s->gb,3); //sample_precision
1304
h->aspect_ratio = get_bits(&s->gb,4);
1305
frame_rate_code = get_bits(&s->gb,4);
1306
skip_bits(&s->gb,18);//bit_rate_lower
1307
skip_bits1(&s->gb); //marker_bit
1308
skip_bits(&s->gb,12);//bit_rate_upper
1309
s->low_delay = get_bits1(&s->gb);
1310
h->mb_width = (s->width + 15) >> 4;
1311
h->mb_height = (s->height + 15) >> 4;
1312
h->s.avctx->time_base.den = ff_frame_rate_tab[frame_rate_code].num;
1313
h->s.avctx->time_base.num = ff_frame_rate_tab[frame_rate_code].den;
1314
h->s.avctx->width = s->width;
1315
h->s.avctx->height = s->height;
1322
* finds the end of the current frame in the bitstream.
1323
* @return the position of the first byte of the next frame, or -1
1325
int ff_cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) {
1329
pic_found= pc->frame_start_found;
1334
for(i=0; i<buf_size; i++){
1335
state= (state<<8) | buf[i];
1336
if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){
1345
/* EOF considered as end of frame */
1348
for(; i<buf_size; i++){
1349
state= (state<<8) | buf[i];
1350
if((state&0xFFFFFF00) == 0x100){
1351
if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){
1352
pc->frame_start_found=0;
1359
pc->frame_start_found= pic_found;
1361
return END_NOT_FOUND;
1364
void ff_cavs_flush(AVCodecContext * avctx) {
1365
AVSContext *h = avctx->priv_data;
1366
h->got_keyframe = 0;
1369
static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size,
1370
uint8_t * buf, int buf_size) {
1371
AVSContext *h = avctx->priv_data;
1372
MpegEncContext *s = &h->s;
1374
const uint8_t *buf_end;
1375
const uint8_t *buf_ptr;
1376
AVFrame *picture = data;
1381
if (buf_size == 0) {
1382
if(!s->low_delay && h->DPB[0].data[0]) {
1383
*data_size = sizeof(AVPicture);
1384
*picture = *(AVFrame *) &h->DPB[0];
1390
buf_end = buf + buf_size;
1392
buf_ptr = ff_find_start_code(buf_ptr,buf_end, &stc);
1393
if(stc & 0xFFFFFE00)
1394
return FFMAX(0, buf_ptr - buf - s->parse_context.last_index);
1395
input_size = (buf_end - buf_ptr)*8;
1397
case SEQ_START_CODE:
1398
init_get_bits(&s->gb, buf_ptr, input_size);
1399
decode_seq_header(h);
1401
case PIC_I_START_CODE:
1402
if(!h->got_keyframe) {
1403
if(h->DPB[0].data[0])
1404
avctx->release_buffer(avctx, (AVFrame *)&h->DPB[0]);
1405
if(h->DPB[1].data[0])
1406
avctx->release_buffer(avctx, (AVFrame *)&h->DPB[1]);
1407
h->got_keyframe = 1;
1409
case PIC_PB_START_CODE:
1411
if(!h->got_keyframe)
1413
init_get_bits(&s->gb, buf_ptr, input_size);
1417
*data_size = sizeof(AVPicture);
1418
if(h->pic_type != FF_B_TYPE) {
1419
if(h->DPB[1].data[0]) {
1420
*picture = *(AVFrame *) &h->DPB[1];
1425
*picture = *(AVFrame *) &h->picture;
1427
case EXT_START_CODE:
1428
//mpeg_decode_extension(avctx,buf_ptr, input_size);
1430
case USER_START_CODE:
1431
//mpeg_decode_user_data(avctx,buf_ptr, input_size);
1434
if (stc >= SLICE_MIN_START_CODE &&
1435
stc <= SLICE_MAX_START_CODE) {
1436
init_get_bits(&s->gb, buf_ptr, input_size);
1437
decode_slice_header(h, &s->gb);
1444
static int cavs_decode_init(AVCodecContext * avctx) {
1445
AVSContext *h = avctx->priv_data;
1446
MpegEncContext * const s = &h->s;
1448
MPV_decode_defaults(s);
1451
avctx->pix_fmt= PIX_FMT_YUV420P;
1453
h->luma_scan[0] = 0;
1454
h->luma_scan[1] = 8;
1455
h->intra_pred_l[ INTRA_L_VERT] = intra_pred_vert;
1456
h->intra_pred_l[ INTRA_L_HORIZ] = intra_pred_horiz;
1457
h->intra_pred_l[ INTRA_L_LP] = intra_pred_lp;
1458
h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;
1459
h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;
1460
h->intra_pred_l[ INTRA_L_LP_LEFT] = intra_pred_lp_left;
1461
h->intra_pred_l[ INTRA_L_LP_TOP] = intra_pred_lp_top;
1462
h->intra_pred_l[ INTRA_L_DC_128] = intra_pred_dc_128;
1463
h->intra_pred_c[ INTRA_C_LP] = intra_pred_lp;
1464
h->intra_pred_c[ INTRA_C_HORIZ] = intra_pred_horiz;
1465
h->intra_pred_c[ INTRA_C_VERT] = intra_pred_vert;
1466
h->intra_pred_c[ INTRA_C_PLANE] = intra_pred_plane;
1467
h->intra_pred_c[ INTRA_C_LP_LEFT] = intra_pred_lp_left;
1468
h->intra_pred_c[ INTRA_C_LP_TOP] = intra_pred_lp_top;
1469
h->intra_pred_c[ INTRA_C_DC_128] = intra_pred_dc_128;
1475
static int cavs_decode_end(AVCodecContext * avctx) {
1476
AVSContext *h = avctx->priv_data;
1479
av_free(h->top_mv[0]);
1480
av_free(h->top_mv[1]);
1481
av_free(h->top_pred_Y);
1482
av_free(h->top_border_y);
1483
av_free(h->top_border_u);
1484
av_free(h->top_border_v);
1486
av_free(h->col_type_base);
1491
AVCodec cavs_decoder = {
1500
CODEC_CAP_DR1 | CODEC_CAP_DELAY,
1501
.flush= ff_cavs_flush,