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Diffstat (limited to 'contrib/ffmpeg/libavcodec/cavs.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/cavs.c | 1540 |
1 files changed, 1540 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/cavs.c b/contrib/ffmpeg/libavcodec/cavs.c new file mode 100644 index 000000000..ee862bbc7 --- /dev/null +++ b/contrib/ffmpeg/libavcodec/cavs.c @@ -0,0 +1,1540 @@ +/* + * Chinese AVS video (AVS1-P2, JiZhun profile) decoder. + * Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/** + * @file cavs.c + * Chinese AVS video (AVS1-P2, JiZhun profile) decoder + * @author Stefan Gehrer <stefan.gehrer@gmx.de> + */ + +#include "avcodec.h" +#include "bitstream.h" +#include "golomb.h" +#include "mpegvideo.h" +#include "cavsdata.h" + +#ifdef CONFIG_CAVS_DECODER +typedef struct { + MpegEncContext s; + Picture picture; ///< currently decoded frame + Picture DPB[2]; ///< reference frames + int dist[2]; ///< temporal distances from current frame to ref frames + int profile, level; + int aspect_ratio; + int mb_width, mb_height; + int pic_type; + int progressive; + int pic_structure; + int skip_mode_flag; ///< select between skip_count or one skip_flag per MB + int loop_filter_disable; + int alpha_offset, beta_offset; + int ref_flag; + int mbx, mby; ///< macroblock coordinates + int flags; ///< availability flags of neighbouring macroblocks + int stc; ///< last start code + uint8_t *cy, *cu, *cv; ///< current MB sample pointers + int left_qp; + uint8_t *top_qp; + + /** mv motion vector cache + 0: D3 B2 B3 C2 + 4: A1 X0 X1 - + 8: A3 X2 X3 - + + X are the vectors in the current macroblock (5,6,9,10) + A is the macroblock to the left (4,8) + B is the macroblock to the top (1,2) + C is the macroblock to the top-right (3) + D is the macroblock to the top-left (0) + + the same is repeated for backward motion vectors */ + vector_t mv[2*4*3]; + vector_t *top_mv[2]; + vector_t *col_mv; + + /** luma pred mode cache + 0: -- B2 B3 + 3: A1 X0 X1 + 6: A3 X2 X3 */ + int pred_mode_Y[3*3]; + int *top_pred_Y; + int l_stride, c_stride; + int luma_scan[4]; + int qp; + int qp_fixed; + int cbp; + ScanTable scantable; + + /** intra prediction is done with un-deblocked samples + they are saved here before deblocking the MB */ + uint8_t *top_border_y, *top_border_u, *top_border_v; + uint8_t left_border_y[26], left_border_u[10], left_border_v[10]; + uint8_t intern_border_y[26]; + uint8_t topleft_border_y, topleft_border_u, topleft_border_v; + + void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride); + void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride); + uint8_t *col_type_base; + uint8_t *col_type; + + /* scaling factors for MV prediction */ + int sym_factor; ///< for scaling in symmetrical B block + int direct_den[2]; ///< for scaling in direct B block + int scale_den[2]; ///< for scaling neighbouring MVs + + int got_keyframe; + DCTELEM *block; +} AVSContext; + +/***************************************************************************** + * + * in-loop deblocking filter + * + ****************************************************************************/ + +static inline int get_bs(vector_t *mvP, vector_t *mvQ, int b) { + if((mvP->ref == REF_INTRA) || (mvQ->ref == REF_INTRA)) + return 2; + if( (abs(mvP->x - mvQ->x) >= 4) || (abs(mvP->y - mvQ->y) >= 4) ) + return 1; + if(b){ + mvP += MV_BWD_OFFS; + mvQ += MV_BWD_OFFS; + if( (abs(mvP->x - mvQ->x) >= 4) || (abs(mvP->y - mvQ->y) >= 4) ) + return 1; + }else{ + if(mvP->ref != mvQ->ref) + return 1; + } + return 0; +} + +#define SET_PARAMS \ + alpha = alpha_tab[clip(qp_avg + h->alpha_offset,0,63)]; \ + beta = beta_tab[clip(qp_avg + h->beta_offset, 0,63)]; \ + tc = tc_tab[clip(qp_avg + h->alpha_offset,0,63)]; + +/** + * in-loop deblocking filter for a single macroblock + * + * boundary strength (bs) mapping: + * + * --4---5-- + * 0 2 | + * | 6 | 7 | + * 1 3 | + * --------- + * + */ +static void filter_mb(AVSContext *h, enum mb_t mb_type) { + DECLARE_ALIGNED_8(uint8_t, bs[8]); + int qp_avg, alpha, beta, tc; + int i; + + /* save un-deblocked lines */ + h->topleft_border_y = h->top_border_y[h->mbx*16+15]; + h->topleft_border_u = h->top_border_u[h->mbx*10+8]; + h->topleft_border_v = h->top_border_v[h->mbx*10+8]; + memcpy(&h->top_border_y[h->mbx*16], h->cy + 15* h->l_stride,16); + memcpy(&h->top_border_u[h->mbx*10+1], h->cu + 7* h->c_stride,8); + memcpy(&h->top_border_v[h->mbx*10+1], h->cv + 7* h->c_stride,8); + for(i=0;i<8;i++) { + h->left_border_y[i*2+1] = *(h->cy + 15 + (i*2+0)*h->l_stride); + h->left_border_y[i*2+2] = *(h->cy + 15 + (i*2+1)*h->l_stride); + h->left_border_u[i+1] = *(h->cu + 7 + i*h->c_stride); + h->left_border_v[i+1] = *(h->cv + 7 + i*h->c_stride); + } + if(!h->loop_filter_disable) { + /* determine bs */ + if(mb_type == I_8X8) + *((uint64_t *)bs) = 0x0202020202020202ULL; + else{ + *((uint64_t *)bs) = 0; + if(partition_flags[mb_type] & SPLITV){ + bs[2] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1], mb_type > P_8X8); + bs[3] = get_bs(&h->mv[MV_FWD_X2], &h->mv[MV_FWD_X3], mb_type > P_8X8); + } + if(partition_flags[mb_type] & SPLITH){ + bs[6] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2], mb_type > P_8X8); + bs[7] = get_bs(&h->mv[MV_FWD_X1], &h->mv[MV_FWD_X3], mb_type > P_8X8); + } + bs[0] = get_bs(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0], mb_type > P_8X8); + bs[1] = get_bs(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2], mb_type > P_8X8); + bs[4] = get_bs(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0], mb_type > P_8X8); + bs[5] = get_bs(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1], mb_type > P_8X8); + } + if( *((uint64_t *)bs) ) { + if(h->flags & A_AVAIL) { + qp_avg = (h->qp + h->left_qp + 1) >> 1; + SET_PARAMS; + h->s.dsp.cavs_filter_lv(h->cy,h->l_stride,alpha,beta,tc,bs[0],bs[1]); + h->s.dsp.cavs_filter_cv(h->cu,h->c_stride,alpha,beta,tc,bs[0],bs[1]); + h->s.dsp.cavs_filter_cv(h->cv,h->c_stride,alpha,beta,tc,bs[0],bs[1]); + } + qp_avg = h->qp; + SET_PARAMS; + h->s.dsp.cavs_filter_lv(h->cy + 8,h->l_stride,alpha,beta,tc,bs[2],bs[3]); + h->s.dsp.cavs_filter_lh(h->cy + 8*h->l_stride,h->l_stride,alpha,beta,tc, + bs[6],bs[7]); + + if(h->flags & B_AVAIL) { + qp_avg = (h->qp + h->top_qp[h->mbx] + 1) >> 1; + SET_PARAMS; + h->s.dsp.cavs_filter_lh(h->cy,h->l_stride,alpha,beta,tc,bs[4],bs[5]); + h->s.dsp.cavs_filter_ch(h->cu,h->c_stride,alpha,beta,tc,bs[4],bs[5]); + h->s.dsp.cavs_filter_ch(h->cv,h->c_stride,alpha,beta,tc,bs[4],bs[5]); + } + } + } + h->left_qp = h->qp; + h->top_qp[h->mbx] = h->qp; +} + +#undef SET_PARAMS + +/***************************************************************************** + * + * spatial intra prediction + * + ****************************************************************************/ + +static inline void load_intra_pred_luma(AVSContext *h, uint8_t *top, + uint8_t **left, int block) { + int i; + + switch(block) { + case 0: + *left = h->left_border_y; + h->left_border_y[0] = h->left_border_y[1]; + memset(&h->left_border_y[17],h->left_border_y[16],9); + memcpy(&top[1],&h->top_border_y[h->mbx*16],16); + top[17] = top[16]; + top[0] = top[1]; + if((h->flags & A_AVAIL) && (h->flags & B_AVAIL)) + h->left_border_y[0] = top[0] = h->topleft_border_y; + break; + case 1: + *left = h->intern_border_y; + for(i=0;i<8;i++) + h->intern_border_y[i+1] = *(h->cy + 7 + i*h->l_stride); + memset(&h->intern_border_y[9],h->intern_border_y[8],9); + h->intern_border_y[0] = h->intern_border_y[1]; + memcpy(&top[1],&h->top_border_y[h->mbx*16+8],8); + if(h->flags & C_AVAIL) + memcpy(&top[9],&h->top_border_y[(h->mbx + 1)*16],8); + else + memset(&top[9],top[8],9); + top[17] = top[16]; + top[0] = top[1]; + if(h->flags & B_AVAIL) + h->intern_border_y[0] = top[0] = h->top_border_y[h->mbx*16+7]; + break; + case 2: + *left = &h->left_border_y[8]; + memcpy(&top[1],h->cy + 7*h->l_stride,16); + top[17] = top[16]; + top[0] = top[1]; + if(h->flags & A_AVAIL) + top[0] = h->left_border_y[8]; + break; + case 3: + *left = &h->intern_border_y[8]; + for(i=0;i<8;i++) + h->intern_border_y[i+9] = *(h->cy + 7 + (i+8)*h->l_stride); + memset(&h->intern_border_y[17],h->intern_border_y[16],9); + memcpy(&top[0],h->cy + 7 + 7*h->l_stride,9); + memset(&top[9],top[8],9); + break; + } +} + +static void intra_pred_vert(uint8_t *d,uint8_t *top,uint8_t *left,int stride) { + int y; + uint64_t a = unaligned64(&top[1]); + for(y=0;y<8;y++) { + *((uint64_t *)(d+y*stride)) = a; + } +} + +static void intra_pred_horiz(uint8_t *d,uint8_t *top,uint8_t *left,int stride) { + int y; + uint64_t a; + for(y=0;y<8;y++) { + a = left[y+1] * 0x0101010101010101ULL; + *((uint64_t *)(d+y*stride)) = a; + } +} + +static void intra_pred_dc_128(uint8_t *d,uint8_t *top,uint8_t *left,int stride) { + int y; + uint64_t a = 0x8080808080808080ULL; + for(y=0;y<8;y++) + *((uint64_t *)(d+y*stride)) = a; +} + +static void intra_pred_plane(uint8_t *d,uint8_t *top,uint8_t *left,int stride) { + int x,y,ia; + int ih = 0; + int iv = 0; + uint8_t *cm = ff_cropTbl + MAX_NEG_CROP; + + for(x=0; x<4; x++) { + ih += (x+1)*(top[5+x]-top[3-x]); + iv += (x+1)*(left[5+x]-left[3-x]); + } + ia = (top[8]+left[8])<<4; + ih = (17*ih+16)>>5; + iv = (17*iv+16)>>5; + for(y=0; y<8; y++) + for(x=0; x<8; x++) + d[y*stride+x] = cm[(ia+(x-3)*ih+(y-3)*iv+16)>>5]; +} + +#define LOWPASS(ARRAY,INDEX) \ + (( ARRAY[(INDEX)-1] + 2*ARRAY[(INDEX)] + ARRAY[(INDEX)+1] + 2) >> 2) + +static void intra_pred_lp(uint8_t *d,uint8_t *top,uint8_t *left,int stride) { + int x,y; + for(y=0; y<8; y++) + for(x=0; x<8; x++) + d[y*stride+x] = (LOWPASS(top,x+1) + LOWPASS(left,y+1)) >> 1; +} + +static void intra_pred_down_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride) { + int x,y; + for(y=0; y<8; y++) + for(x=0; x<8; x++) + d[y*stride+x] = (LOWPASS(top,x+y+2) + LOWPASS(left,x+y+2)) >> 1; +} + +static void intra_pred_down_right(uint8_t *d,uint8_t *top,uint8_t *left,int stride) { + int x,y; + for(y=0; y<8; y++) + for(x=0; x<8; x++) + if(x==y) + d[y*stride+x] = (left[1]+2*top[0]+top[1]+2)>>2; + else if(x>y) + d[y*stride+x] = LOWPASS(top,x-y); + else + d[y*stride+x] = LOWPASS(left,y-x); +} + +static void intra_pred_lp_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride) { + int x,y; + for(y=0; y<8; y++) + for(x=0; x<8; x++) + d[y*stride+x] = LOWPASS(left,y+1); +} + +static void intra_pred_lp_top(uint8_t *d,uint8_t *top,uint8_t *left,int stride) { + int x,y; + for(y=0; y<8; y++) + for(x=0; x<8; x++) + d[y*stride+x] = LOWPASS(top,x+1); +} + +#undef LOWPASS + +static inline void modify_pred(const int_fast8_t *mod_table, int *mode) { + *mode = mod_table[*mode]; + if(*mode < 0) { + av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n"); + *mode = 0; + } +} + +/***************************************************************************** + * + * motion compensation + * + ****************************************************************************/ + +static inline void mc_dir_part(AVSContext *h,Picture *pic,int square, + int chroma_height,int delta,int list,uint8_t *dest_y, + uint8_t *dest_cb,uint8_t *dest_cr,int src_x_offset, + int src_y_offset,qpel_mc_func *qpix_op, + h264_chroma_mc_func chroma_op,vector_t *mv){ + MpegEncContext * const s = &h->s; + const int mx= mv->x + src_x_offset*8; + const int my= mv->y + src_y_offset*8; + const int luma_xy= (mx&3) + ((my&3)<<2); + uint8_t * src_y = pic->data[0] + (mx>>2) + (my>>2)*h->l_stride; + uint8_t * src_cb= pic->data[1] + (mx>>3) + (my>>3)*h->c_stride; + uint8_t * src_cr= pic->data[2] + (mx>>3) + (my>>3)*h->c_stride; + int extra_width= 0; //(s->flags&CODEC_FLAG_EMU_EDGE) ? 0 : 16; + int extra_height= extra_width; + int emu=0; + const int full_mx= mx>>2; + const int full_my= my>>2; + const int pic_width = 16*h->mb_width; + const int pic_height = 16*h->mb_height; + + if(!pic->data[0]) + return; + if(mx&7) extra_width -= 3; + if(my&7) extra_height -= 3; + + if( full_mx < 0-extra_width + || full_my < 0-extra_height + || full_mx + 16/*FIXME*/ > pic_width + extra_width + || full_my + 16/*FIXME*/ > pic_height + extra_height){ + ff_emulated_edge_mc(s->edge_emu_buffer, src_y - 2 - 2*h->l_stride, h->l_stride, + 16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height); + src_y= s->edge_emu_buffer + 2 + 2*h->l_stride; + emu=1; + } + + qpix_op[luma_xy](dest_y, src_y, h->l_stride); //FIXME try variable height perhaps? + if(!square){ + qpix_op[luma_xy](dest_y + delta, src_y + delta, h->l_stride); + } + + if(emu){ + ff_emulated_edge_mc(s->edge_emu_buffer, src_cb, h->c_stride, + 9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1); + src_cb= s->edge_emu_buffer; + } + chroma_op(dest_cb, src_cb, h->c_stride, chroma_height, mx&7, my&7); + + if(emu){ + ff_emulated_edge_mc(s->edge_emu_buffer, src_cr, h->c_stride, + 9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1); + src_cr= s->edge_emu_buffer; + } + chroma_op(dest_cr, src_cr, h->c_stride, chroma_height, mx&7, my&7); +} + +static inline void mc_part_std(AVSContext *h,int square,int chroma_height,int delta, + uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr, + int x_offset, int y_offset,qpel_mc_func *qpix_put, + h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg, + h264_chroma_mc_func chroma_avg, vector_t *mv){ + qpel_mc_func *qpix_op= qpix_put; + h264_chroma_mc_func chroma_op= chroma_put; + + dest_y += 2*x_offset + 2*y_offset*h->l_stride; + dest_cb += x_offset + y_offset*h->c_stride; + dest_cr += x_offset + y_offset*h->c_stride; + x_offset += 8*h->mbx; + y_offset += 8*h->mby; + + if(mv->ref >= 0){ + Picture *ref= &h->DPB[mv->ref]; + mc_dir_part(h, ref, square, chroma_height, delta, 0, + dest_y, dest_cb, dest_cr, x_offset, y_offset, + qpix_op, chroma_op, mv); + + qpix_op= qpix_avg; + chroma_op= chroma_avg; + } + + if((mv+MV_BWD_OFFS)->ref >= 0){ + Picture *ref= &h->DPB[0]; + mc_dir_part(h, ref, square, chroma_height, delta, 1, + dest_y, dest_cb, dest_cr, x_offset, y_offset, + qpix_op, chroma_op, mv+MV_BWD_OFFS); + } +} + +static void inter_pred(AVSContext *h, enum mb_t mb_type) { + if(partition_flags[mb_type] == 0){ // 16x16 + mc_part_std(h, 1, 8, 0, h->cy, h->cu, h->cv, 0, 0, + h->s.dsp.put_cavs_qpel_pixels_tab[0], + h->s.dsp.put_h264_chroma_pixels_tab[0], + h->s.dsp.avg_cavs_qpel_pixels_tab[0], + h->s.dsp.avg_h264_chroma_pixels_tab[0],&h->mv[MV_FWD_X0]); + }else{ + mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 0, + h->s.dsp.put_cavs_qpel_pixels_tab[1], + h->s.dsp.put_h264_chroma_pixels_tab[1], + h->s.dsp.avg_cavs_qpel_pixels_tab[1], + h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X0]); + mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 0, + h->s.dsp.put_cavs_qpel_pixels_tab[1], + h->s.dsp.put_h264_chroma_pixels_tab[1], + h->s.dsp.avg_cavs_qpel_pixels_tab[1], + h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X1]); + mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 4, + h->s.dsp.put_cavs_qpel_pixels_tab[1], + h->s.dsp.put_h264_chroma_pixels_tab[1], + h->s.dsp.avg_cavs_qpel_pixels_tab[1], + h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X2]); + mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 4, + h->s.dsp.put_cavs_qpel_pixels_tab[1], + h->s.dsp.put_h264_chroma_pixels_tab[1], + h->s.dsp.avg_cavs_qpel_pixels_tab[1], + h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X3]); + } + /* set intra prediction modes to default values */ + h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP; + h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP; +} + +/***************************************************************************** + * + * motion vector prediction + * + ****************************************************************************/ + +static inline void set_mvs(vector_t *mv, enum block_t size) { + switch(size) { + case BLK_16X16: + mv[MV_STRIDE ] = mv[0]; + mv[MV_STRIDE+1] = mv[0]; + case BLK_16X8: + mv[1] = mv[0]; + break; + case BLK_8X16: + mv[MV_STRIDE] = mv[0]; + break; + } +} + +static inline void store_mvs(AVSContext *h) { + h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 0] = h->mv[MV_FWD_X0]; + h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 1] = h->mv[MV_FWD_X1]; + h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 2] = h->mv[MV_FWD_X2]; + h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 3] = h->mv[MV_FWD_X3]; +} + +static inline void scale_mv(AVSContext *h, int *d_x, int *d_y, vector_t *src, int distp) { + int den = h->scale_den[src->ref]; + + *d_x = (src->x*distp*den + 256 + (src->x>>31)) >> 9; + *d_y = (src->y*distp*den + 256 + (src->y>>31)) >> 9; +} + +static inline void mv_pred_median(AVSContext *h, vector_t *mvP, vector_t *mvA, vector_t *mvB, vector_t *mvC) { + int ax, ay, bx, by, cx, cy; + int len_ab, len_bc, len_ca, len_mid; + + /* scale candidates according to their temporal span */ + scale_mv(h, &ax, &ay, mvA, mvP->dist); + scale_mv(h, &bx, &by, mvB, mvP->dist); + scale_mv(h, &cx, &cy, mvC, mvP->dist); + /* find the geometrical median of the three candidates */ + len_ab = abs(ax - bx) + abs(ay - by); + len_bc = abs(bx - cx) + abs(by - cy); + len_ca = abs(cx - ax) + abs(cy - ay); + len_mid = mid_pred(len_ab, len_bc, len_ca); + if(len_mid == len_ab) { + mvP->x = cx; + mvP->y = cy; + } else if(len_mid == len_bc) { + mvP->x = ax; + mvP->y = ay; + } else { + mvP->x = bx; + mvP->y = by; + } +} + +static inline void mv_pred_direct(AVSContext *h, vector_t *pmv_fw, + vector_t *col_mv) { + vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS; + int den = h->direct_den[col_mv->ref]; + int m = col_mv->x >> 31; + + pmv_fw->dist = h->dist[1]; + pmv_bw->dist = h->dist[0]; + pmv_fw->ref = 1; + pmv_bw->ref = 0; + /* scale the co-located motion vector according to its temporal span */ + pmv_fw->x = (((den+(den*col_mv->x*pmv_fw->dist^m)-m-1)>>14)^m)-m; + pmv_bw->x = m-(((den+(den*col_mv->x*pmv_bw->dist^m)-m-1)>>14)^m); + m = col_mv->y >> 31; + pmv_fw->y = (((den+(den*col_mv->y*pmv_fw->dist^m)-m-1)>>14)^m)-m; + pmv_bw->y = m-(((den+(den*col_mv->y*pmv_bw->dist^m)-m-1)>>14)^m); +} + +static inline void mv_pred_sym(AVSContext *h, vector_t *src, enum block_t size) { + vector_t *dst = src + MV_BWD_OFFS; + + /* backward mv is the scaled and negated forward mv */ + dst->x = -((src->x * h->sym_factor + 256) >> 9); + dst->y = -((src->y * h->sym_factor + 256) >> 9); + dst->ref = 0; + dst->dist = h->dist[0]; + set_mvs(dst, size); +} + +static void mv_pred(AVSContext *h, enum mv_loc_t nP, enum mv_loc_t nC, + enum mv_pred_t mode, enum block_t size, int ref) { + vector_t *mvP = &h->mv[nP]; + vector_t *mvA = &h->mv[nP-1]; + vector_t *mvB = &h->mv[nP-4]; + vector_t *mvC = &h->mv[nC]; + const vector_t *mvP2 = NULL; + + mvP->ref = ref; + mvP->dist = h->dist[mvP->ref]; + if(mvC->ref == NOT_AVAIL) + mvC = &h->mv[nP-5]; // set to top-left (mvD) + if((mode == MV_PRED_PSKIP) && + ((mvA->ref == NOT_AVAIL) || (mvB->ref == NOT_AVAIL) || + ((mvA->x | mvA->y | mvA->ref) == 0) || + ((mvB->x | mvB->y | mvB->ref) == 0) )) { + mvP2 = &un_mv; + /* if there is only one suitable candidate, take it */ + } else if((mvA->ref >= 0) && (mvB->ref < 0) && (mvC->ref < 0)) { + mvP2= mvA; + } else if((mvA->ref < 0) && (mvB->ref >= 0) && (mvC->ref < 0)) { + mvP2= mvB; + } else if((mvA->ref < 0) && (mvB->ref < 0) && (mvC->ref >= 0)) { + mvP2= mvC; + } else if(mode == MV_PRED_LEFT && mvA->ref == ref){ + mvP2= mvA; + } else if(mode == MV_PRED_TOP && mvB->ref == ref){ + mvP2= mvB; + } else if(mode == MV_PRED_TOPRIGHT && mvC->ref == ref){ + mvP2= mvC; + } + if(mvP2){ + mvP->x = mvP2->x; + mvP->y = mvP2->y; + }else + mv_pred_median(h, mvP, mvA, mvB, mvC); + + if(mode < MV_PRED_PSKIP) { + mvP->x += get_se_golomb(&h->s.gb); + mvP->y += get_se_golomb(&h->s.gb); + } + set_mvs(mvP,size); +} + +/***************************************************************************** + * + * residual data decoding + * + ****************************************************************************/ + +/** kth-order exponential golomb code */ +static inline int get_ue_code(GetBitContext *gb, int order) { + if(order) { + int ret = get_ue_golomb(gb) << order; + return ret + get_bits(gb,order); + } + return get_ue_golomb(gb); +} + +/** + * decode coefficients from one 8x8 block, dequantize, inverse transform + * and add them to sample block + * @param r pointer to 2D VLC table + * @param esc_golomb_order escape codes are k-golomb with this order k + * @param qp quantizer + * @param dst location of sample block + * @param stride line stride in frame buffer + */ +static int decode_residual_block(AVSContext *h, GetBitContext *gb, + const residual_vlc_t *r, int esc_golomb_order, + int qp, uint8_t *dst, int stride) { + int i,pos = -1; + int level_code, esc_code, level, run, mask; + int level_buf[64]; + int run_buf[64]; + int dqm = dequant_mul[qp]; + int dqs = dequant_shift[qp]; + int dqa = 1 << (dqs - 1); + const uint8_t *scantab = h->scantable.permutated; + DCTELEM *block = h->block; + + for(i=0;i<65;i++) { + level_code = get_ue_code(gb,r->golomb_order); + if(level_code >= ESCAPE_CODE) { + run = ((level_code - ESCAPE_CODE) >> 1) + 1; + esc_code = get_ue_code(gb,esc_golomb_order); + level = esc_code + (run > r->max_run ? 1 : r->level_add[run]); + while(level > r->inc_limit) + r++; + mask = -(level_code & 1); + level = (level^mask) - mask; + } else { + level = r->rltab[level_code][0]; + if(!level) //end of block signal + break; + run = r->rltab[level_code][1]; + r += r->rltab[level_code][2]; + } + level_buf[i] = level; + run_buf[i] = run; + } + /* inverse scan and dequantization */ + while(--i >= 0){ + pos += run_buf[i]; + if(pos > 63) { + av_log(h->s.avctx, AV_LOG_ERROR, + "position out of block bounds at pic %d MB(%d,%d)\n", + h->picture.poc, h->mbx, h->mby); + return -1; + } + block[scantab[pos]] = (level_buf[i]*dqm + dqa) >> dqs; + } + h->s.dsp.cavs_idct8_add(dst,block,stride); + return 0; +} + + +static inline void decode_residual_chroma(AVSContext *h) { + if(h->cbp & (1<<4)) + decode_residual_block(h,&h->s.gb,chroma_2dvlc,0, chroma_qp[h->qp], + h->cu,h->c_stride); + if(h->cbp & (1<<5)) + decode_residual_block(h,&h->s.gb,chroma_2dvlc,0, chroma_qp[h->qp], + h->cv,h->c_stride); +} + +static inline int decode_residual_inter(AVSContext *h) { + int block; + + /* get coded block pattern */ + int cbp= get_ue_golomb(&h->s.gb); + if(cbp > 63){ + av_log(h->s.avctx, AV_LOG_ERROR, "illegal inter cbp\n"); + return -1; + } + h->cbp = cbp_tab[cbp][1]; + + /* get quantizer */ + if(h->cbp && !h->qp_fixed) + h->qp = (h->qp + get_se_golomb(&h->s.gb)) & 63; + for(block=0;block<4;block++) + if(h->cbp & (1<<block)) + decode_residual_block(h,&h->s.gb,inter_2dvlc,0,h->qp, + h->cy + h->luma_scan[block], h->l_stride); + decode_residual_chroma(h); + + return 0; +} + +/***************************************************************************** + * + * macroblock level + * + ****************************************************************************/ + +/** + * initialise predictors for motion vectors and intra prediction + */ +static inline void init_mb(AVSContext *h) { + int i; + + /* copy predictors from top line (MB B and C) into cache */ + for(i=0;i<3;i++) { + h->mv[MV_FWD_B2+i] = h->top_mv[0][h->mbx*2+i]; + h->mv[MV_BWD_B2+i] = h->top_mv[1][h->mbx*2+i]; + } + h->pred_mode_Y[1] = h->top_pred_Y[h->mbx*2+0]; + h->pred_mode_Y[2] = h->top_pred_Y[h->mbx*2+1]; + /* clear top predictors if MB B is not available */ + if(!(h->flags & B_AVAIL)) { + h->mv[MV_FWD_B2] = un_mv; + h->mv[MV_FWD_B3] = un_mv; + h->mv[MV_BWD_B2] = un_mv; + h->mv[MV_BWD_B3] = un_mv; + h->pred_mode_Y[1] = h->pred_mode_Y[2] = NOT_AVAIL; + h->flags &= ~(C_AVAIL|D_AVAIL); + } else if(h->mbx) { + h->flags |= D_AVAIL; + } + if(h->mbx == h->mb_width-1) //MB C not available + h->flags &= ~C_AVAIL; + /* clear top-right predictors if MB C is not available */ + if(!(h->flags & C_AVAIL)) { + h->mv[MV_FWD_C2] = un_mv; + h->mv[MV_BWD_C2] = un_mv; + } + /* clear top-left predictors if MB D is not available */ + if(!(h->flags & D_AVAIL)) { + h->mv[MV_FWD_D3] = un_mv; + h->mv[MV_BWD_D3] = un_mv; + } + /* set pointer for co-located macroblock type */ + h->col_type = &h->col_type_base[h->mby*h->mb_width + h->mbx]; +} + +static inline void check_for_slice(AVSContext *h); + +/** + * save predictors for later macroblocks and increase + * macroblock address + * @returns 0 if end of frame is reached, 1 otherwise + */ +static inline int next_mb(AVSContext *h) { + int i; + + h->flags |= A_AVAIL; + h->cy += 16; + h->cu += 8; + h->cv += 8; + /* copy mvs as predictors to the left */ + for(i=0;i<=20;i+=4) + h->mv[i] = h->mv[i+2]; + /* copy bottom mvs from cache to top line */ + h->top_mv[0][h->mbx*2+0] = h->mv[MV_FWD_X2]; + h->top_mv[0][h->mbx*2+1] = h->mv[MV_FWD_X3]; + h->top_mv[1][h->mbx*2+0] = h->mv[MV_BWD_X2]; + h->top_mv[1][h->mbx*2+1] = h->mv[MV_BWD_X3]; + /* next MB address */ + h->mbx++; + if(h->mbx == h->mb_width) { //new mb line + h->flags = B_AVAIL|C_AVAIL; + /* clear left pred_modes */ + h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL; + /* clear left mv predictors */ + for(i=0;i<=20;i+=4) + h->mv[i] = un_mv; + h->mbx = 0; + h->mby++; + /* re-calculate sample pointers */ + h->cy = h->picture.data[0] + h->mby*16*h->l_stride; + h->cu = h->picture.data[1] + h->mby*8*h->c_stride; + h->cv = h->picture.data[2] + h->mby*8*h->c_stride; + if(h->mby == h->mb_height) { //frame end + return 0; + } else { + //check_for_slice(h); + } + } + return 1; +} + +static int decode_mb_i(AVSContext *h, int cbp_code) { + GetBitContext *gb = &h->s.gb; + int block, pred_mode_uv; + uint8_t top[18]; + uint8_t *left = NULL; + uint8_t *d; + + init_mb(h); + + /* get intra prediction modes from stream */ + for(block=0;block<4;block++) { + int nA,nB,predpred; + int pos = scan3x3[block]; + + nA = h->pred_mode_Y[pos-1]; + nB = h->pred_mode_Y[pos-3]; + predpred = FFMIN(nA,nB); + if(predpred == NOT_AVAIL) // if either is not available + predpred = INTRA_L_LP; + if(!get_bits1(gb)){ + int rem_mode= get_bits(gb, 2); + predpred = rem_mode + (rem_mode >= predpred); + } + h->pred_mode_Y[pos] = predpred; + } + pred_mode_uv = get_ue_golomb(gb); + if(pred_mode_uv > 6) { + av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n"); + return -1; + } + + /* save pred modes before they get modified */ + h->pred_mode_Y[3] = h->pred_mode_Y[5]; + h->pred_mode_Y[6] = h->pred_mode_Y[8]; + h->top_pred_Y[h->mbx*2+0] = h->pred_mode_Y[7]; + h->top_pred_Y[h->mbx*2+1] = h->pred_mode_Y[8]; + + /* modify pred modes according to availability of neighbour samples */ + if(!(h->flags & A_AVAIL)) { + modify_pred(left_modifier_l, &h->pred_mode_Y[4] ); + modify_pred(left_modifier_l, &h->pred_mode_Y[7] ); + modify_pred(left_modifier_c, &pred_mode_uv ); + } + if(!(h->flags & B_AVAIL)) { + modify_pred(top_modifier_l, &h->pred_mode_Y[4] ); + modify_pred(top_modifier_l, &h->pred_mode_Y[5] ); + modify_pred(top_modifier_c, &pred_mode_uv ); + } + + /* get coded block pattern */ + if(h->pic_type == FF_I_TYPE) + cbp_code = get_ue_golomb(gb); + if(cbp_code > 63){ + av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra cbp\n"); + return -1; + } + h->cbp = cbp_tab[cbp_code][0]; + if(h->cbp && !h->qp_fixed) + h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta + + /* luma intra prediction interleaved with residual decode/transform/add */ + for(block=0;block<4;block++) { + d = h->cy + h->luma_scan[block]; + load_intra_pred_luma(h, top, &left, block); + h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]] + (d, top, left, h->l_stride); + if(h->cbp & (1<<block)) + decode_residual_block(h,gb,intra_2dvlc,1,h->qp,d,h->l_stride); + } + + /* chroma intra prediction */ + /* extend borders by one pixel */ + h->left_border_u[9] = h->left_border_u[8]; + h->left_border_v[9] = h->left_border_v[8]; + h->top_border_u[h->mbx*10+9] = h->top_border_u[h->mbx*10+8]; + h->top_border_v[h->mbx*10+9] = h->top_border_v[h->mbx*10+8]; + if(h->mbx && h->mby) { + h->top_border_u[h->mbx*10] = h->left_border_u[0] = h->topleft_border_u; + h->top_border_v[h->mbx*10] = h->left_border_v[0] = h->topleft_border_v; + } else { + h->left_border_u[0] = h->left_border_u[1]; + h->left_border_v[0] = h->left_border_v[1]; + h->top_border_u[h->mbx*10] = h->top_border_u[h->mbx*10+1]; + h->top_border_v[h->mbx*10] = h->top_border_v[h->mbx*10+1]; + } + h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx*10], + h->left_border_u, h->c_stride); + h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx*10], + h->left_border_v, h->c_stride); + + decode_residual_chroma(h); + filter_mb(h,I_8X8); + + /* mark motion vectors as intra */ + h->mv[MV_FWD_X0] = intra_mv; + set_mvs(&h->mv[MV_FWD_X0], BLK_16X16); + h->mv[MV_BWD_X0] = intra_mv; + set_mvs(&h->mv[MV_BWD_X0], BLK_16X16); + if(h->pic_type != FF_B_TYPE) + *h->col_type = I_8X8; + + return 0; +} + +static void decode_mb_p(AVSContext *h, enum mb_t mb_type) { + GetBitContext *gb = &h->s.gb; + int ref[4]; + + init_mb(h); + switch(mb_type) { + case P_SKIP: + mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0); + break; + case P_16X16: + ref[0] = h->ref_flag ? 0 : get_bits1(gb); + mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16,ref[0]); + break; + case P_16X8: + ref[0] = h->ref_flag ? 0 : get_bits1(gb); + ref[2] = h->ref_flag ? 0 : get_bits1(gb); + mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]); + mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]); + break; + case P_8X16: + ref[0] = h->ref_flag ? 0 : get_bits1(gb); + ref[1] = h->ref_flag ? 0 : get_bits1(gb); + mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]); + mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]); + break; + case P_8X8: + ref[0] = h->ref_flag ? 0 : get_bits1(gb); + ref[1] = h->ref_flag ? 0 : get_bits1(gb); + ref[2] = h->ref_flag ? 0 : get_bits1(gb); + ref[3] = h->ref_flag ? 0 : get_bits1(gb); + mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]); + mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]); + mv_pred(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]); + mv_pred(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]); + } + inter_pred(h, mb_type); + store_mvs(h); + if(mb_type != P_SKIP) + decode_residual_inter(h); + filter_mb(h,mb_type); + *h->col_type = mb_type; +} + +static void decode_mb_b(AVSContext *h, enum mb_t mb_type) { + int block; + enum sub_mb_t sub_type[4]; + int flags; + + init_mb(h); + + /* reset all MVs */ + h->mv[MV_FWD_X0] = dir_mv; + set_mvs(&h->mv[MV_FWD_X0], BLK_16X16); + h->mv[MV_BWD_X0] = dir_mv; + set_mvs(&h->mv[MV_BWD_X0], BLK_16X16); + switch(mb_type) { + case B_SKIP: + case B_DIRECT: + if(!(*h->col_type)) { + /* intra MB at co-location, do in-plane prediction */ + mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1); + mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0); + } else + /* direct prediction from co-located P MB, block-wise */ + for(block=0;block<4;block++) + mv_pred_direct(h,&h->mv[mv_scan[block]], + &h->col_mv[(h->mby*h->mb_width+h->mbx)*4 + block]); + break; + case B_FWD_16X16: + mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1); + break; + case B_SYM_16X16: + mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1); + mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16); + break; + case B_BWD_16X16: + mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0); + break; + case B_8X8: + for(block=0;block<4;block++) + sub_type[block] = get_bits(&h->s.gb,2); + for(block=0;block<4;block++) { + switch(sub_type[block]) { + case B_SUB_DIRECT: + if(!(*h->col_type)) { + /* intra MB at co-location, do in-plane prediction */ + mv_pred(h, mv_scan[block], mv_scan[block]-3, + MV_PRED_BSKIP, BLK_8X8, 1); + mv_pred(h, mv_scan[block]+MV_BWD_OFFS, + mv_scan[block]-3+MV_BWD_OFFS, + MV_PRED_BSKIP, BLK_8X8, 0); + } else + mv_pred_direct(h,&h->mv[mv_scan[block]], + &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]); + break; + case B_SUB_FWD: + mv_pred(h, mv_scan[block], mv_scan[block]-3, + MV_PRED_MEDIAN, BLK_8X8, 1); + break; + case B_SUB_SYM: + mv_pred(h, mv_scan[block], mv_scan[block]-3, + MV_PRED_MEDIAN, BLK_8X8, 1); + mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8); + break; + } + } + for(block=0;block<4;block++) { + if(sub_type[block] == B_SUB_BWD) + mv_pred(h, mv_scan[block]+MV_BWD_OFFS, + mv_scan[block]+MV_BWD_OFFS-3, + MV_PRED_MEDIAN, BLK_8X8, 0); + } + break; + default: + assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8)); + flags = partition_flags[mb_type]; + if(mb_type & 1) { /* 16x8 macroblock types */ + if(flags & FWD0) + mv_pred(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, 1); + if(flags & SYM0) + mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8); + if(flags & FWD1) + mv_pred(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1); + if(flags & SYM1) + mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8); + if(flags & BWD0) + mv_pred(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, 0); + if(flags & BWD1) + mv_pred(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0); + } else { /* 8x16 macroblock types */ + if(flags & FWD0) + mv_pred(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1); + if(flags & SYM0) + mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16); + if(flags & FWD1) + mv_pred(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 1); + if(flags & SYM1) + mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16); + if(flags & BWD0) + mv_pred(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0); + if(flags & BWD1) + mv_pred(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, 0); + } + } + inter_pred(h, mb_type); + if(mb_type != B_SKIP) + decode_residual_inter(h); + filter_mb(h,mb_type); +} + +/***************************************************************************** + * + * slice level + * + ****************************************************************************/ + +static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) { + if(h->stc > 0xAF) + av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc); + h->mby = h->stc; + if((h->mby == 0) && (!h->qp_fixed)){ + h->qp_fixed = get_bits1(gb); + h->qp = get_bits(gb,6); + } + /* inter frame or second slice can have weighting params */ + if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2)) + if(get_bits1(gb)) { //slice_weighting_flag + av_log(h->s.avctx, AV_LOG_ERROR, + "weighted prediction not yet supported\n"); + } + return 0; +} + +static inline void check_for_slice(AVSContext *h) { + GetBitContext *gb = &h->s.gb; + int align; + align = (-get_bits_count(gb)) & 7; + if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) { + get_bits_long(gb,24+align); + h->stc = get_bits(gb,8); + decode_slice_header(h,gb); + } +} + +/***************************************************************************** + * + * frame level + * + ****************************************************************************/ + +static void init_pic(AVSContext *h) { + int i; + + /* clear some predictors */ + for(i=0;i<=20;i+=4) + h->mv[i] = un_mv; + h->mv[MV_BWD_X0] = dir_mv; + set_mvs(&h->mv[MV_BWD_X0], BLK_16X16); + h->mv[MV_FWD_X0] = dir_mv; + set_mvs(&h->mv[MV_FWD_X0], BLK_16X16); + h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL; + h->cy = h->picture.data[0]; + h->cu = h->picture.data[1]; + h->cv = h->picture.data[2]; + h->l_stride = h->picture.linesize[0]; + h->c_stride = h->picture.linesize[1]; + h->luma_scan[2] = 8*h->l_stride; + h->luma_scan[3] = 8*h->l_stride+8; + h->mbx = h->mby = 0; + h->flags = 0; +} + +static int decode_pic(AVSContext *h) { + MpegEncContext *s = &h->s; + int skip_count; + enum mb_t mb_type; + + if (!s->context_initialized) { + s->avctx->idct_algo = FF_IDCT_CAVS; + if (MPV_common_init(s) < 0) + return -1; + ff_init_scantable(s->dsp.idct_permutation,&h->scantable,ff_zigzag_direct); + } + get_bits(&s->gb,16);//bbv_dwlay + if(h->stc == PIC_PB_START_CODE) { + h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE; + if(h->pic_type > FF_B_TYPE) { + av_log(s->avctx, AV_LOG_ERROR, "illegal picture type\n"); + return -1; + } + /* make sure we have the reference frames we need */ + if(!h->DPB[0].data[0] || + (!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE)) + return -1; + } else { + h->pic_type = FF_I_TYPE; + if(get_bits1(&s->gb)) + get_bits(&s->gb,16);//time_code + } + /* release last B frame */ + if(h->picture.data[0]) + s->avctx->release_buffer(s->avctx, (AVFrame *)&h->picture); + + s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture); + init_pic(h); + h->picture.poc = get_bits(&s->gb,8)*2; + + /* get temporal distances and MV scaling factors */ + if(h->pic_type != FF_B_TYPE) { + h->dist[0] = (h->picture.poc - h->DPB[0].poc + 512) % 512; + } else { + h->dist[0] = (h->DPB[0].poc - h->picture.poc + 512) % 512; + } + h->dist[1] = (h->picture.poc - h->DPB[1].poc + 512) % 512; + h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0; + h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0; + if(h->pic_type == FF_B_TYPE) { + h->sym_factor = h->dist[0]*h->scale_den[1]; + } else { + h->direct_den[0] = h->dist[0] ? 16384/h->dist[0] : 0; + h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0; + } + + if(s->low_delay) + get_ue_golomb(&s->gb); //bbv_check_times + h->progressive = get_bits1(&s->gb); + if(h->progressive) + h->pic_structure = 1; + else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) ) + get_bits1(&s->gb); //advanced_pred_mode_disable + skip_bits1(&s->gb); //top_field_first + skip_bits1(&s->gb); //repeat_first_field + h->qp_fixed = get_bits1(&s->gb); + h->qp = get_bits(&s->gb,6); + if(h->pic_type == FF_I_TYPE) { + if(!h->progressive && !h->pic_structure) + skip_bits1(&s->gb);//what is this? + skip_bits(&s->gb,4); //reserved bits + } else { + if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1)) + h->ref_flag = get_bits1(&s->gb); + skip_bits(&s->gb,4); //reserved bits + h->skip_mode_flag = get_bits1(&s->gb); + } + h->loop_filter_disable = get_bits1(&s->gb); + if(!h->loop_filter_disable && get_bits1(&s->gb)) { + h->alpha_offset = get_se_golomb(&s->gb); + h->beta_offset = get_se_golomb(&s->gb); + } else { + h->alpha_offset = h->beta_offset = 0; + } + check_for_slice(h); + if(h->pic_type == FF_I_TYPE) { + do { + decode_mb_i(h, 0); + } while(next_mb(h)); + } else if(h->pic_type == FF_P_TYPE) { + do { + if(h->skip_mode_flag) { + skip_count = get_ue_golomb(&s->gb); + while(skip_count--) { + decode_mb_p(h,P_SKIP); + if(!next_mb(h)) + goto done; + } + mb_type = get_ue_golomb(&s->gb) + P_16X16; + } else + mb_type = get_ue_golomb(&s->gb) + P_SKIP; + if(mb_type > P_8X8) { + decode_mb_i(h, mb_type - P_8X8 - 1); + } else + decode_mb_p(h,mb_type); + } while(next_mb(h)); + } else { /* FF_B_TYPE */ + do { + if(h->skip_mode_flag) { + skip_count = get_ue_golomb(&s->gb); + while(skip_count--) { + decode_mb_b(h,B_SKIP); + if(!next_mb(h)) + goto done; + } + mb_type = get_ue_golomb(&s->gb) + B_DIRECT; + } else + mb_type = get_ue_golomb(&s->gb) + B_SKIP; + if(mb_type > B_8X8) { + decode_mb_i(h, mb_type - B_8X8 - 1); + } else + decode_mb_b(h,mb_type); + } while(next_mb(h)); + } + done: + if(h->pic_type != FF_B_TYPE) { + if(h->DPB[1].data[0]) + s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]); + memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture)); + memcpy(&h->DPB[0], &h->picture, sizeof(Picture)); + memset(&h->picture,0,sizeof(Picture)); + } + return 0; +} + +/***************************************************************************** + * + * headers and interface + * + ****************************************************************************/ + +/** + * some predictions require data from the top-neighbouring macroblock. + * this data has to be stored for one complete row of macroblocks + * and this storage space is allocated here + */ +static void init_top_lines(AVSContext *h) { + /* alloc top line of predictors */ + h->top_qp = av_malloc( h->mb_width); + h->top_mv[0] = av_malloc((h->mb_width*2+1)*sizeof(vector_t)); + h->top_mv[1] = av_malloc((h->mb_width*2+1)*sizeof(vector_t)); + h->top_pred_Y = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y)); + h->top_border_y = av_malloc((h->mb_width+1)*16); + h->top_border_u = av_malloc((h->mb_width)*10); + h->top_border_v = av_malloc((h->mb_width)*10); + + /* alloc space for co-located MVs and types */ + h->col_mv = av_malloc( h->mb_width*h->mb_height*4*sizeof(vector_t)); + h->col_type_base = av_malloc(h->mb_width*h->mb_height); + h->block = av_mallocz(64*sizeof(DCTELEM)); +} + +static int decode_seq_header(AVSContext *h) { + MpegEncContext *s = &h->s; + extern const AVRational ff_frame_rate_tab[]; + int frame_rate_code; + + h->profile = get_bits(&s->gb,8); + h->level = get_bits(&s->gb,8); + skip_bits1(&s->gb); //progressive sequence + s->width = get_bits(&s->gb,14); + s->height = get_bits(&s->gb,14); + skip_bits(&s->gb,2); //chroma format + skip_bits(&s->gb,3); //sample_precision + h->aspect_ratio = get_bits(&s->gb,4); + frame_rate_code = get_bits(&s->gb,4); + skip_bits(&s->gb,18);//bit_rate_lower + skip_bits1(&s->gb); //marker_bit + skip_bits(&s->gb,12);//bit_rate_upper + s->low_delay = get_bits1(&s->gb); + h->mb_width = (s->width + 15) >> 4; + h->mb_height = (s->height + 15) >> 4; + h->s.avctx->time_base.den = ff_frame_rate_tab[frame_rate_code].num; + h->s.avctx->time_base.num = ff_frame_rate_tab[frame_rate_code].den; + h->s.avctx->width = s->width; + h->s.avctx->height = s->height; + if(!h->top_qp) + init_top_lines(h); + return 0; +} + +static void cavs_flush(AVCodecContext * avctx) { + AVSContext *h = avctx->priv_data; + h->got_keyframe = 0; +} + +static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size, + uint8_t * buf, int buf_size) { + AVSContext *h = avctx->priv_data; + MpegEncContext *s = &h->s; + int input_size; + const uint8_t *buf_end; + const uint8_t *buf_ptr; + AVFrame *picture = data; + uint32_t stc; + + s->avctx = avctx; + + if (buf_size == 0) { + if(!s->low_delay && h->DPB[0].data[0]) { + *data_size = sizeof(AVPicture); + *picture = *(AVFrame *) &h->DPB[0]; + } + return 0; + } + + buf_ptr = buf; + buf_end = buf + buf_size; + for(;;) { + buf_ptr = ff_find_start_code(buf_ptr,buf_end, &stc); + if(stc & 0xFFFFFE00) + return FFMAX(0, buf_ptr - buf - s->parse_context.last_index); + input_size = (buf_end - buf_ptr)*8; + switch(stc) { + case SEQ_START_CODE: + init_get_bits(&s->gb, buf_ptr, input_size); + decode_seq_header(h); + break; + case PIC_I_START_CODE: + if(!h->got_keyframe) { + if(h->DPB[0].data[0]) + avctx->release_buffer(avctx, (AVFrame *)&h->DPB[0]); + if(h->DPB[1].data[0]) + avctx->release_buffer(avctx, (AVFrame *)&h->DPB[1]); + h->got_keyframe = 1; + } + case PIC_PB_START_CODE: + *data_size = 0; + if(!h->got_keyframe) + break; + init_get_bits(&s->gb, buf_ptr, input_size); + h->stc = stc; + if(decode_pic(h)) + break; + *data_size = sizeof(AVPicture); + if(h->pic_type != FF_B_TYPE) { + if(h->DPB[1].data[0]) { + *picture = *(AVFrame *) &h->DPB[1]; + } else { + *data_size = 0; + } + } else + *picture = *(AVFrame *) &h->picture; + break; + case EXT_START_CODE: + //mpeg_decode_extension(avctx,buf_ptr, input_size); + break; + case USER_START_CODE: + //mpeg_decode_user_data(avctx,buf_ptr, input_size); + break; + default: + if (stc >= SLICE_MIN_START_CODE && + stc <= SLICE_MAX_START_CODE) { + init_get_bits(&s->gb, buf_ptr, input_size); + decode_slice_header(h, &s->gb); + } + break; + } + } +} + +static int cavs_decode_init(AVCodecContext * avctx) { + AVSContext *h = avctx->priv_data; + MpegEncContext * const s = &h->s; + + MPV_decode_defaults(s); + s->avctx = avctx; + + avctx->pix_fmt= PIX_FMT_YUV420P; + + h->luma_scan[0] = 0; + h->luma_scan[1] = 8; + h->intra_pred_l[ INTRA_L_VERT] = intra_pred_vert; + h->intra_pred_l[ INTRA_L_HORIZ] = intra_pred_horiz; + h->intra_pred_l[ INTRA_L_LP] = intra_pred_lp; + h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left; + h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right; + h->intra_pred_l[ INTRA_L_LP_LEFT] = intra_pred_lp_left; + h->intra_pred_l[ INTRA_L_LP_TOP] = intra_pred_lp_top; + h->intra_pred_l[ INTRA_L_DC_128] = intra_pred_dc_128; + h->intra_pred_c[ INTRA_C_LP] = intra_pred_lp; + h->intra_pred_c[ INTRA_C_HORIZ] = intra_pred_horiz; + h->intra_pred_c[ INTRA_C_VERT] = intra_pred_vert; + h->intra_pred_c[ INTRA_C_PLANE] = intra_pred_plane; + h->intra_pred_c[ INTRA_C_LP_LEFT] = intra_pred_lp_left; + h->intra_pred_c[ INTRA_C_LP_TOP] = intra_pred_lp_top; + h->intra_pred_c[ INTRA_C_DC_128] = intra_pred_dc_128; + h->mv[ 7] = un_mv; + h->mv[19] = un_mv; + return 0; +} + +static int cavs_decode_end(AVCodecContext * avctx) { + AVSContext *h = avctx->priv_data; + + av_free(h->top_qp); + av_free(h->top_mv[0]); + av_free(h->top_mv[1]); + av_free(h->top_pred_Y); + av_free(h->top_border_y); + av_free(h->top_border_u); + av_free(h->top_border_v); + av_free(h->col_mv); + av_free(h->col_type_base); + av_free(h->block); + return 0; +} + +AVCodec cavs_decoder = { + "cavs", + CODEC_TYPE_VIDEO, + CODEC_ID_CAVS, + sizeof(AVSContext), + cavs_decode_init, + NULL, + cavs_decode_end, + cavs_decode_frame, + CODEC_CAP_DR1 | CODEC_CAP_DELAY, + .flush= cavs_flush, +}; +#endif /* CONFIG_CAVS_DECODER */ + +#ifdef CONFIG_CAVSVIDEO_PARSER +/** + * finds the end of the current frame in the bitstream. + * @return the position of the first byte of the next frame, or -1 + */ +static int cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, + int buf_size) { + int pic_found, i; + uint32_t state; + + pic_found= pc->frame_start_found; + state= pc->state; + + i=0; + if(!pic_found){ + for(i=0; i<buf_size; i++){ + state= (state<<8) | buf[i]; + if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){ + i++; + pic_found=1; + break; + } + } + } + + if(pic_found){ + /* EOF considered as end of frame */ + if (buf_size == 0) + return 0; + for(; i<buf_size; i++){ + state= (state<<8) | buf[i]; + if((state&0xFFFFFF00) == 0x100){ + if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){ + pc->frame_start_found=0; + pc->state=-1; + return i-3; + } + } + } + } + pc->frame_start_found= pic_found; + pc->state= state; + return END_NOT_FOUND; +} + +static int cavsvideo_parse(AVCodecParserContext *s, + AVCodecContext *avctx, + uint8_t **poutbuf, int *poutbuf_size, + const uint8_t *buf, int buf_size) +{ + ParseContext *pc = s->priv_data; + int next; + + if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){ + next= buf_size; + }else{ + next= cavs_find_frame_end(pc, buf, buf_size); + + if (ff_combine_frame(pc, next, (uint8_t **)&buf, &buf_size) < 0) { + *poutbuf = NULL; + *poutbuf_size = 0; + return buf_size; + } + } + *poutbuf = (uint8_t *)buf; + *poutbuf_size = buf_size; + return next; +} + +AVCodecParser cavsvideo_parser = { + { CODEC_ID_CAVS }, + sizeof(ParseContext1), + NULL, + cavsvideo_parse, + ff_parse1_close, + ff_mpeg4video_split, +}; +#endif /* CONFIG_CAVSVIDEO_PARSER */ |