2 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
3 * Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder
25 * @author Stefan Gehrer <stefan.gehrer@gmx.de>
29 #include "bitstream.h"
31 #include "mpegvideo.h"
36 Picture picture; ///< currently decoded frame
37 Picture DPB[2]; ///< reference frames
38 int dist[2]; ///< temporal distances from current frame to ref frames
41 int mb_width, mb_height;
45 int skip_mode_flag; ///< select between skip_count or one skip_flag per MB
46 int loop_filter_disable;
47 int alpha_offset, beta_offset;
49 int mbx, mby; ///< macroblock coordinates
50 int flags; ///< availability flags of neighbouring macroblocks
51 int stc; ///< last start code
52 uint8_t *cy, *cu, *cv; ///< current MB sample pointers
56 /** mv motion vector cache
61 X are the vectors in the current macroblock (5,6,9,10)
62 A is the macroblock to the left (4,8)
63 B is the macroblock to the top (1,2)
64 C is the macroblock to the top-right (3)
65 D is the macroblock to the top-left (0)
67 the same is repeated for backward motion vectors */
72 /** luma pred mode cache
78 int l_stride, c_stride;
85 /** intra prediction is done with un-deblocked samples
86 they are saved here before deblocking the MB */
87 uint8_t *top_border_y, *top_border_u, *top_border_v;
88 uint8_t left_border_y[26], left_border_u[10], left_border_v[10];
89 uint8_t intern_border_y[26];
90 uint8_t topleft_border_y, topleft_border_u, topleft_border_v;
92 void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
93 void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
94 uint8_t *col_type_base;
97 /* scaling factors for MV prediction */
98 int sym_factor; ///< for scaling in symmetrical B block
99 int direct_den[2]; ///< for scaling in direct B block
100 int scale_den[2]; ///< for scaling neighbouring MVs
106 /*****************************************************************************
108 * in-loop deblocking filter
110 ****************************************************************************/
112 static inline int get_bs(vector_t *mvP, vector_t *mvQ, int b) {
113 if((mvP->ref == REF_INTRA) || (mvQ->ref == REF_INTRA))
115 if( (abs(mvP->x - mvQ->x) >= 4) || (abs(mvP->y - mvQ->y) >= 4) )
120 if( (abs(mvP->x - mvQ->x) >= 4) || (abs(mvP->y - mvQ->y) >= 4) )
123 if(mvP->ref != mvQ->ref)
130 alpha = alpha_tab[clip(qp_avg + h->alpha_offset,0,63)]; \
131 beta = beta_tab[clip(qp_avg + h->beta_offset, 0,63)]; \
132 tc = tc_tab[clip(qp_avg + h->alpha_offset,0,63)];
135 * in-loop deblocking filter for a single macroblock
137 * boundary strength (bs) mapping:
146 static void filter_mb(AVSContext *h, enum mb_t mb_type) {
147 DECLARE_ALIGNED_8(uint8_t, bs[8]);
148 int qp_avg, alpha, beta, tc;
151 /* save un-deblocked lines */
152 h->topleft_border_y = h->top_border_y[h->mbx*16+15];
153 h->topleft_border_u = h->top_border_u[h->mbx*10+8];
154 h->topleft_border_v = h->top_border_v[h->mbx*10+8];
155 memcpy(&h->top_border_y[h->mbx*16], h->cy + 15* h->l_stride,16);
156 memcpy(&h->top_border_u[h->mbx*10+1], h->cu + 7* h->c_stride,8);
157 memcpy(&h->top_border_v[h->mbx*10+1], h->cv + 7* h->c_stride,8);
159 h->left_border_y[i*2+1] = *(h->cy + 15 + (i*2+0)*h->l_stride);
160 h->left_border_y[i*2+2] = *(h->cy + 15 + (i*2+1)*h->l_stride);
161 h->left_border_u[i+1] = *(h->cu + 7 + i*h->c_stride);
162 h->left_border_v[i+1] = *(h->cv + 7 + i*h->c_stride);
164 if(!h->loop_filter_disable) {
167 *((uint64_t *)bs) = 0x0202020202020202ULL;
169 *((uint64_t *)bs) = 0;
170 if(partition_flags[mb_type] & SPLITV){
171 bs[2] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1], mb_type > P_8X8);
172 bs[3] = get_bs(&h->mv[MV_FWD_X2], &h->mv[MV_FWD_X3], mb_type > P_8X8);
174 if(partition_flags[mb_type] & SPLITH){
175 bs[6] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2], mb_type > P_8X8);
176 bs[7] = get_bs(&h->mv[MV_FWD_X1], &h->mv[MV_FWD_X3], mb_type > P_8X8);
178 bs[0] = get_bs(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0], mb_type > P_8X8);
179 bs[1] = get_bs(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2], mb_type > P_8X8);
180 bs[4] = get_bs(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0], mb_type > P_8X8);
181 bs[5] = get_bs(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1], mb_type > P_8X8);
183 if( *((uint64_t *)bs) ) {
184 if(h->flags & A_AVAIL) {
185 qp_avg = (h->qp + h->left_qp + 1) >> 1;
187 h->s.dsp.cavs_filter_lv(h->cy,h->l_stride,alpha,beta,tc,bs[0],bs[1]);
188 h->s.dsp.cavs_filter_cv(h->cu,h->c_stride,alpha,beta,tc,bs[0],bs[1]);
189 h->s.dsp.cavs_filter_cv(h->cv,h->c_stride,alpha,beta,tc,bs[0],bs[1]);
193 h->s.dsp.cavs_filter_lv(h->cy + 8,h->l_stride,alpha,beta,tc,bs[2],bs[3]);
194 h->s.dsp.cavs_filter_lh(h->cy + 8*h->l_stride,h->l_stride,alpha,beta,tc,
197 if(h->flags & B_AVAIL) {
198 qp_avg = (h->qp + h->top_qp[h->mbx] + 1) >> 1;
200 h->s.dsp.cavs_filter_lh(h->cy,h->l_stride,alpha,beta,tc,bs[4],bs[5]);
201 h->s.dsp.cavs_filter_ch(h->cu,h->c_stride,alpha,beta,tc,bs[4],bs[5]);
202 h->s.dsp.cavs_filter_ch(h->cv,h->c_stride,alpha,beta,tc,bs[4],bs[5]);
207 h->top_qp[h->mbx] = h->qp;
212 /*****************************************************************************
214 * spatial intra prediction
216 ****************************************************************************/
218 static inline void load_intra_pred_luma(AVSContext *h, uint8_t *top,
219 uint8_t **left, int block) {
224 *left = h->left_border_y;
225 h->left_border_y[0] = h->left_border_y[1];
226 memset(&h->left_border_y[17],h->left_border_y[16],9);
227 memcpy(&top[1],&h->top_border_y[h->mbx*16],16);
230 if((h->flags & A_AVAIL) && (h->flags & B_AVAIL))
231 h->left_border_y[0] = top[0] = h->topleft_border_y;
234 *left = h->intern_border_y;
236 h->intern_border_y[i+1] = *(h->cy + 7 + i*h->l_stride);
237 memset(&h->intern_border_y[9],h->intern_border_y[8],9);
238 h->intern_border_y[0] = h->intern_border_y[1];
239 memcpy(&top[1],&h->top_border_y[h->mbx*16+8],8);
240 if(h->flags & C_AVAIL)
241 memcpy(&top[9],&h->top_border_y[(h->mbx + 1)*16],8);
243 memset(&top[9],top[8],9);
246 if(h->flags & B_AVAIL)
247 h->intern_border_y[0] = top[0] = h->top_border_y[h->mbx*16+7];
250 *left = &h->left_border_y[8];
251 memcpy(&top[1],h->cy + 7*h->l_stride,16);
254 if(h->flags & A_AVAIL)
255 top[0] = h->left_border_y[8];
258 *left = &h->intern_border_y[8];
260 h->intern_border_y[i+9] = *(h->cy + 7 + (i+8)*h->l_stride);
261 memset(&h->intern_border_y[17],h->intern_border_y[16],9);
262 memcpy(&top[0],h->cy + 7 + 7*h->l_stride,9);
263 memset(&top[9],top[8],9);
268 static void intra_pred_vert(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
270 uint64_t a = unaligned64(&top[1]);
272 *((uint64_t *)(d+y*stride)) = a;
276 static void intra_pred_horiz(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
280 a = left[y+1] * 0x0101010101010101ULL;
281 *((uint64_t *)(d+y*stride)) = a;
285 static void intra_pred_dc_128(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
287 uint64_t a = 0x8080808080808080ULL;
289 *((uint64_t *)(d+y*stride)) = a;
292 static void intra_pred_plane(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
296 uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
299 ih += (x+1)*(top[5+x]-top[3-x]);
300 iv += (x+1)*(left[5+x]-left[3-x]);
302 ia = (top[8]+left[8])<<4;
307 d[y*stride+x] = cm[(ia+(x-3)*ih+(y-3)*iv+16)>>5];
310 #define LOWPASS(ARRAY,INDEX) \
311 (( ARRAY[(INDEX)-1] + 2*ARRAY[(INDEX)] + ARRAY[(INDEX)+1] + 2) >> 2)
313 static void intra_pred_lp(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
317 d[y*stride+x] = (LOWPASS(top,x+1) + LOWPASS(left,y+1)) >> 1;
320 static void intra_pred_down_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
324 d[y*stride+x] = (LOWPASS(top,x+y+2) + LOWPASS(left,x+y+2)) >> 1;
327 static void intra_pred_down_right(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
332 d[y*stride+x] = (left[1]+2*top[0]+top[1]+2)>>2;
334 d[y*stride+x] = LOWPASS(top,x-y);
336 d[y*stride+x] = LOWPASS(left,y-x);
339 static void intra_pred_lp_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
343 d[y*stride+x] = LOWPASS(left,y+1);
346 static void intra_pred_lp_top(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
350 d[y*stride+x] = LOWPASS(top,x+1);
355 static inline void modify_pred(const int_fast8_t *mod_table, int *mode) {
356 *mode = mod_table[*mode];
358 av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n");
363 /*****************************************************************************
365 * motion compensation
367 ****************************************************************************/
369 static inline void mc_dir_part(AVSContext *h,Picture *pic,int square,
370 int chroma_height,int delta,int list,uint8_t *dest_y,
371 uint8_t *dest_cb,uint8_t *dest_cr,int src_x_offset,
372 int src_y_offset,qpel_mc_func *qpix_op,
373 h264_chroma_mc_func chroma_op,vector_t *mv){
374 MpegEncContext * const s = &h->s;
375 const int mx= mv->x + src_x_offset*8;
376 const int my= mv->y + src_y_offset*8;
377 const int luma_xy= (mx&3) + ((my&3)<<2);
378 uint8_t * src_y = pic->data[0] + (mx>>2) + (my>>2)*h->l_stride;
379 uint8_t * src_cb= pic->data[1] + (mx>>3) + (my>>3)*h->c_stride;
380 uint8_t * src_cr= pic->data[2] + (mx>>3) + (my>>3)*h->c_stride;
381 int extra_width= 0; //(s->flags&CODEC_FLAG_EMU_EDGE) ? 0 : 16;
382 int extra_height= extra_width;
384 const int full_mx= mx>>2;
385 const int full_my= my>>2;
386 const int pic_width = 16*h->mb_width;
387 const int pic_height = 16*h->mb_height;
391 if(mx&7) extra_width -= 3;
392 if(my&7) extra_height -= 3;
394 if( full_mx < 0-extra_width
395 || full_my < 0-extra_height
396 || full_mx + 16/*FIXME*/ > pic_width + extra_width
397 || full_my + 16/*FIXME*/ > pic_height + extra_height){
398 ff_emulated_edge_mc(s->edge_emu_buffer, src_y - 2 - 2*h->l_stride, h->l_stride,
399 16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);
400 src_y= s->edge_emu_buffer + 2 + 2*h->l_stride;
404 qpix_op[luma_xy](dest_y, src_y, h->l_stride); //FIXME try variable height perhaps?
406 qpix_op[luma_xy](dest_y + delta, src_y + delta, h->l_stride);
410 ff_emulated_edge_mc(s->edge_emu_buffer, src_cb, h->c_stride,
411 9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);
412 src_cb= s->edge_emu_buffer;
414 chroma_op(dest_cb, src_cb, h->c_stride, chroma_height, mx&7, my&7);
417 ff_emulated_edge_mc(s->edge_emu_buffer, src_cr, h->c_stride,
418 9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);
419 src_cr= s->edge_emu_buffer;
421 chroma_op(dest_cr, src_cr, h->c_stride, chroma_height, mx&7, my&7);
424 static inline void mc_part_std(AVSContext *h,int square,int chroma_height,int delta,
425 uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,
426 int x_offset, int y_offset,qpel_mc_func *qpix_put,
427 h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,
428 h264_chroma_mc_func chroma_avg, vector_t *mv){
429 qpel_mc_func *qpix_op= qpix_put;
430 h264_chroma_mc_func chroma_op= chroma_put;
432 dest_y += 2*x_offset + 2*y_offset*h->l_stride;
433 dest_cb += x_offset + y_offset*h->c_stride;
434 dest_cr += x_offset + y_offset*h->c_stride;
435 x_offset += 8*h->mbx;
436 y_offset += 8*h->mby;
439 Picture *ref= &h->DPB[mv->ref];
440 mc_dir_part(h, ref, square, chroma_height, delta, 0,
441 dest_y, dest_cb, dest_cr, x_offset, y_offset,
442 qpix_op, chroma_op, mv);
445 chroma_op= chroma_avg;
448 if((mv+MV_BWD_OFFS)->ref >= 0){
449 Picture *ref= &h->DPB[0];
450 mc_dir_part(h, ref, square, chroma_height, delta, 1,
451 dest_y, dest_cb, dest_cr, x_offset, y_offset,
452 qpix_op, chroma_op, mv+MV_BWD_OFFS);
456 static void inter_pred(AVSContext *h, enum mb_t mb_type) {
457 if(partition_flags[mb_type] == 0){ // 16x16
458 mc_part_std(h, 1, 8, 0, h->cy, h->cu, h->cv, 0, 0,
459 h->s.dsp.put_cavs_qpel_pixels_tab[0],
460 h->s.dsp.put_h264_chroma_pixels_tab[0],
461 h->s.dsp.avg_cavs_qpel_pixels_tab[0],
462 h->s.dsp.avg_h264_chroma_pixels_tab[0],&h->mv[MV_FWD_X0]);
464 mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 0,
465 h->s.dsp.put_cavs_qpel_pixels_tab[1],
466 h->s.dsp.put_h264_chroma_pixels_tab[1],
467 h->s.dsp.avg_cavs_qpel_pixels_tab[1],
468 h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X0]);
469 mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 0,
470 h->s.dsp.put_cavs_qpel_pixels_tab[1],
471 h->s.dsp.put_h264_chroma_pixels_tab[1],
472 h->s.dsp.avg_cavs_qpel_pixels_tab[1],
473 h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X1]);
474 mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 4,
475 h->s.dsp.put_cavs_qpel_pixels_tab[1],
476 h->s.dsp.put_h264_chroma_pixels_tab[1],
477 h->s.dsp.avg_cavs_qpel_pixels_tab[1],
478 h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X2]);
479 mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 4,
480 h->s.dsp.put_cavs_qpel_pixels_tab[1],
481 h->s.dsp.put_h264_chroma_pixels_tab[1],
482 h->s.dsp.avg_cavs_qpel_pixels_tab[1],
483 h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X3]);
485 /* set intra prediction modes to default values */
486 h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP;
487 h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP;
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];
513 h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 2] = h->mv[MV_FWD_X2];
514 h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 3] = h->mv[MV_FWD_X3];
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,