yading@10: /*
yading@10:  * Copyright (c) 2002 The FFmpeg Project
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "mpegvideo.h"
yading@10: #include "h263.h"
yading@10: #include "mathops.h"
yading@10: #include "msmpeg4.h"
yading@10: #include "msmpeg4data.h"
yading@10: #include "intrax8.h"
yading@10: #include "wmv2.h"
yading@10: 
yading@10: 
yading@10: static void parse_mb_skip(Wmv2Context * w){
yading@10:     int mb_x, mb_y;
yading@10:     MpegEncContext * const s= &w->s;
yading@10:     uint32_t * const mb_type = s->current_picture_ptr->mb_type;
yading@10: 
yading@10:     w->skip_type= get_bits(&s->gb, 2);
yading@10:     switch(w->skip_type){
yading@10:     case SKIP_TYPE_NONE:
yading@10:         for(mb_y=0; mb_y<s->mb_height; mb_y++){
yading@10:             for(mb_x=0; mb_x<s->mb_width; mb_x++){
yading@10:                 mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_16x16 | MB_TYPE_L0;
yading@10:             }
yading@10:         }
yading@10:         break;
yading@10:     case SKIP_TYPE_MPEG:
yading@10:         for(mb_y=0; mb_y<s->mb_height; mb_y++){
yading@10:             for(mb_x=0; mb_x<s->mb_width; mb_x++){
yading@10:                 mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
yading@10:             }
yading@10:         }
yading@10:         break;
yading@10:     case SKIP_TYPE_ROW:
yading@10:         for(mb_y=0; mb_y<s->mb_height; mb_y++){
yading@10:             if(get_bits1(&s->gb)){
yading@10:                 for(mb_x=0; mb_x<s->mb_width; mb_x++){
yading@10:                     mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
yading@10:                 }
yading@10:             }else{
yading@10:                 for(mb_x=0; mb_x<s->mb_width; mb_x++){
yading@10:                     mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:         break;
yading@10:     case SKIP_TYPE_COL:
yading@10:         for(mb_x=0; mb_x<s->mb_width; mb_x++){
yading@10:             if(get_bits1(&s->gb)){
yading@10:                 for(mb_y=0; mb_y<s->mb_height; mb_y++){
yading@10:                     mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
yading@10:                 }
yading@10:             }else{
yading@10:                 for(mb_y=0; mb_y<s->mb_height; mb_y++){
yading@10:                     mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:         break;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int decode_ext_header(Wmv2Context *w){
yading@10:     MpegEncContext * const s= &w->s;
yading@10:     GetBitContext gb;
yading@10:     int fps;
yading@10:     int code;
yading@10: 
yading@10:     if(s->avctx->extradata_size<4) return -1;
yading@10: 
yading@10:     init_get_bits(&gb, s->avctx->extradata, 32);
yading@10: 
yading@10:     fps                = get_bits(&gb, 5);
yading@10:     s->bit_rate        = get_bits(&gb, 11)*1024;
yading@10:     w->mspel_bit       = get_bits1(&gb);
yading@10:     s->loop_filter     = get_bits1(&gb);
yading@10:     w->abt_flag        = get_bits1(&gb);
yading@10:     w->j_type_bit      = get_bits1(&gb);
yading@10:     w->top_left_mv_flag= get_bits1(&gb);
yading@10:     w->per_mb_rl_bit   = get_bits1(&gb);
yading@10:     code               = get_bits(&gb, 3);
yading@10: 
yading@10:     if(code==0) return -1;
yading@10: 
yading@10:     s->slice_height = s->mb_height / code;
yading@10: 
yading@10:     if(s->avctx->debug&FF_DEBUG_PICT_INFO){
yading@10:         av_log(s->avctx, AV_LOG_DEBUG, "fps:%d, br:%d, qpbit:%d, abt_flag:%d, j_type_bit:%d, tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, slices:%d\n",
yading@10:         fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit, w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter,
yading@10:         code);
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int ff_wmv2_decode_picture_header(MpegEncContext * s)
yading@10: {
yading@10:     Wmv2Context * const w= (Wmv2Context*)s;
yading@10:     int code;
yading@10: 
yading@10:     if(s->picture_number==0)
yading@10:         decode_ext_header(w);
yading@10: 
yading@10:     s->pict_type = get_bits1(&s->gb) + 1;
yading@10:     if(s->pict_type == AV_PICTURE_TYPE_I){
yading@10:         code = get_bits(&s->gb, 7);
yading@10:         av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
yading@10:     }
yading@10:     s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
yading@10:     if(s->qscale <= 0)
yading@10:        return -1;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s)
yading@10: {
yading@10:     Wmv2Context * const w= (Wmv2Context*)s;
yading@10: 
yading@10:     if (s->pict_type == AV_PICTURE_TYPE_I) {
yading@10:         if(w->j_type_bit) w->j_type= get_bits1(&s->gb);
yading@10:         else              w->j_type= 0; //FIXME check
yading@10: 
yading@10:         if(!w->j_type){
yading@10:             if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);
yading@10:             else                 s->per_mb_rl_table= 0;
yading@10: 
yading@10:             if(!s->per_mb_rl_table){
yading@10:                 s->rl_chroma_table_index = decode012(&s->gb);
yading@10:                 s->rl_table_index = decode012(&s->gb);
yading@10:             }
yading@10: 
yading@10:             s->dc_table_index = get_bits1(&s->gb);
yading@10:         }
yading@10:         s->inter_intra_pred= 0;
yading@10:         s->no_rounding = 1;
yading@10:         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
yading@10:             av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
yading@10:                 s->qscale,
yading@10:                 s->rl_chroma_table_index,
yading@10:                 s->rl_table_index,
yading@10:                 s->dc_table_index,
yading@10:                 s->per_mb_rl_table,
yading@10:                 w->j_type);
yading@10:         }
yading@10:     }else{
yading@10:         int cbp_index;
yading@10:         w->j_type=0;
yading@10: 
yading@10:         parse_mb_skip(w);
yading@10:         cbp_index= decode012(&s->gb);
yading@10:         if(s->qscale <= 10){
yading@10:             int map[3]= {0,2,1};
yading@10:             w->cbp_table_index= map[cbp_index];
yading@10:         }else if(s->qscale <= 20){
yading@10:             int map[3]= {1,0,2};
yading@10:             w->cbp_table_index= map[cbp_index];
yading@10:         }else{
yading@10:             int map[3]= {2,1,0};
yading@10:             w->cbp_table_index= map[cbp_index];
yading@10:         }
yading@10: 
yading@10:         if(w->mspel_bit) s->mspel= get_bits1(&s->gb);
yading@10:         else             s->mspel= 0; //FIXME check
yading@10: 
yading@10:         if(w->abt_flag){
yading@10:             w->per_mb_abt= get_bits1(&s->gb)^1;
yading@10:             if(!w->per_mb_abt){
yading@10:                 w->abt_type= decode012(&s->gb);
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);
yading@10:         else                 s->per_mb_rl_table= 0;
yading@10: 
yading@10:         if(!s->per_mb_rl_table){
yading@10:             s->rl_table_index = decode012(&s->gb);
yading@10:             s->rl_chroma_table_index = s->rl_table_index;
yading@10:         }
yading@10: 
yading@10:         s->dc_table_index = get_bits1(&s->gb);
yading@10:         s->mv_table_index = get_bits1(&s->gb);
yading@10: 
yading@10:         s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
yading@10:         s->no_rounding ^= 1;
yading@10: 
yading@10:         if(s->avctx->debug&FF_DEBUG_PICT_INFO){
yading@10:             av_log(s->avctx, AV_LOG_DEBUG, "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n",
yading@10:                 s->rl_table_index,
yading@10:                 s->rl_chroma_table_index,
yading@10:                 s->dc_table_index,
yading@10:                 s->mv_table_index,
yading@10:                 s->per_mb_rl_table,
yading@10:                 s->qscale,
yading@10:                 s->mspel,
yading@10:                 w->per_mb_abt,
yading@10:                 w->abt_type,
yading@10:                 w->cbp_table_index,
yading@10:                 s->inter_intra_pred);
yading@10:         }
yading@10:     }
yading@10:     s->esc3_level_length= 0;
yading@10:     s->esc3_run_length= 0;
yading@10: 
yading@10: s->picture_number++; //FIXME ?
yading@10: 
yading@10: 
yading@10:     if(w->j_type){
yading@10:         ff_intrax8_decode_picture(&w->x8, 2*s->qscale, (s->qscale-1)|1 );
yading@10:         return 1;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr){
yading@10:     MpegEncContext * const s= &w->s;
yading@10:     int ret;
yading@10: 
yading@10:     ret= ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
yading@10: 
yading@10:     if(ret<0) return -1;
yading@10: 
yading@10:     if((((*mx_ptr)|(*my_ptr)) & 1) && s->mspel)
yading@10:         w->hshift= get_bits1(&s->gb);
yading@10:     else
yading@10:         w->hshift= 0;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py){
yading@10:     MpegEncContext * const s= &w->s;
yading@10:     int xy, wrap, diff, type;
yading@10:     int16_t *A, *B, *C, *mot_val;
yading@10: 
yading@10:     wrap = s->b8_stride;
yading@10:     xy = s->block_index[0];
yading@10: 
yading@10:     mot_val = s->current_picture.motion_val[0][xy];
yading@10: 
yading@10:     A = s->current_picture.motion_val[0][xy - 1];
yading@10:     B = s->current_picture.motion_val[0][xy - wrap];
yading@10:     C = s->current_picture.motion_val[0][xy + 2 - wrap];
yading@10: 
yading@10:     if(s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
yading@10:         diff= FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
yading@10:     else
yading@10:         diff=0;
yading@10: 
yading@10:     if(diff >= 8)
yading@10:         type= get_bits1(&s->gb);
yading@10:     else
yading@10:         type= 2;
yading@10: 
yading@10:     if(type == 0){
yading@10:         *px= A[0];
yading@10:         *py= A[1];
yading@10:     }else if(type == 1){
yading@10:         *px= B[0];
yading@10:         *py= B[1];
yading@10:     }else{
yading@10:         /* special case for first (slice) line */
yading@10:         if (s->first_slice_line) {
yading@10:             *px = A[0];
yading@10:             *py = A[1];
yading@10:         } else {
yading@10:             *px = mid_pred(A[0], B[0], C[0]);
yading@10:             *py = mid_pred(A[1], B[1], C[1]);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return mot_val;
yading@10: }
yading@10: 
yading@10: static inline int wmv2_decode_inter_block(Wmv2Context *w, int16_t *block, int n, int cbp){
yading@10:     MpegEncContext * const s= &w->s;
yading@10:     static const int sub_cbp_table[3]= {2,3,1};
yading@10:     int sub_cbp;
yading@10: 
yading@10:     if(!cbp){
yading@10:         s->block_last_index[n] = -1;
yading@10: 
yading@10:         return 0;
yading@10:     }
yading@10: 
yading@10:     if(w->per_block_abt)
yading@10:         w->abt_type= decode012(&s->gb);
yading@10:     w->abt_type_table[n]= w->abt_type;
yading@10: 
yading@10:     if(w->abt_type){
yading@10: //        const uint8_t *scantable= w->abt_scantable[w->abt_type-1].permutated;
yading@10:         const uint8_t *scantable= w->abt_scantable[w->abt_type-1].scantable;
yading@10: //        const uint8_t *scantable= w->abt_type-1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;
yading@10: 
yading@10:         sub_cbp= sub_cbp_table[ decode012(&s->gb) ];
yading@10: 
yading@10:         if(sub_cbp&1){
yading@10:             if (ff_msmpeg4_decode_block(s, block, n, 1, scantable) < 0)
yading@10:                 return -1;
yading@10:         }
yading@10: 
yading@10:         if(sub_cbp&2){
yading@10:             if (ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable) < 0)
yading@10:                 return -1;
yading@10:         }
yading@10:         s->block_last_index[n] = 63;
yading@10: 
yading@10:         return 0;
yading@10:     }else{
yading@10:         return ff_msmpeg4_decode_block(s, block, n, 1, s->inter_scantable.permutated);
yading@10:     }
yading@10: }
yading@10: 
yading@10: 
yading@10: int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
yading@10: {
yading@10:     Wmv2Context * const w= (Wmv2Context*)s;
yading@10:     int cbp, code, i;
yading@10:     uint8_t *coded_val;
yading@10: 
yading@10:     if(w->j_type) return 0;
yading@10: 
yading@10:     if (s->pict_type == AV_PICTURE_TYPE_P) {
yading@10:         if (IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])) {
yading@10:             /* skip mb */
yading@10:             s->mb_intra = 0;
yading@10:             for(i=0;i<6;i++)
yading@10:                 s->block_last_index[i] = -1;
yading@10:             s->mv_dir = MV_DIR_FORWARD;
yading@10:             s->mv_type = MV_TYPE_16X16;
yading@10:             s->mv[0][0][0] = 0;
yading@10:             s->mv[0][0][1] = 0;
yading@10:             s->mb_skipped = 1;
yading@10:             w->hshift=0;
yading@10:             return 0;
yading@10:         }
yading@10: 
yading@10:         code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table, MB_NON_INTRA_VLC_BITS, 3);
yading@10:         if (code < 0)
yading@10:             return -1;
yading@10:         s->mb_intra = (~code & 0x40) >> 6;
yading@10: 
yading@10:         cbp = code & 0x3f;
yading@10:     } else {
yading@10:         s->mb_intra = 1;
yading@10:         code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
yading@10:         if (code < 0){
yading@10:             av_log(s->avctx, AV_LOG_ERROR, "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);
yading@10:             return -1;
yading@10:         }
yading@10:         /* predict coded block pattern */
yading@10:         cbp = 0;
yading@10:         for(i=0;i<6;i++) {
yading@10:             int val = ((code >> (5 - i)) & 1);
yading@10:             if (i < 4) {
yading@10:                 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
yading@10:                 val = val ^ pred;
yading@10:                 *coded_val = val;
yading@10:             }
yading@10:             cbp |= val << (5 - i);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (!s->mb_intra) {
yading@10:         int mx, my;
yading@10:         wmv2_pred_motion(w, &mx, &my);
yading@10: 
yading@10:         if(cbp){
yading@10:             s->dsp.clear_blocks(s->block[0]);
yading@10:             if(s->per_mb_rl_table){
yading@10:                 s->rl_table_index = decode012(&s->gb);
yading@10:                 s->rl_chroma_table_index = s->rl_table_index;
yading@10:             }
yading@10: 
yading@10:             if(w->abt_flag && w->per_mb_abt){
yading@10:                 w->per_block_abt= get_bits1(&s->gb);
yading@10:                 if(!w->per_block_abt)
yading@10:                     w->abt_type= decode012(&s->gb);
yading@10:             }else
yading@10:                 w->per_block_abt=0;
yading@10:         }
yading@10: 
yading@10:         if (wmv2_decode_motion(w, &mx, &my) < 0)
yading@10:             return -1;
yading@10: 
yading@10:         s->mv_dir = MV_DIR_FORWARD;
yading@10:         s->mv_type = MV_TYPE_16X16;
yading@10:         s->mv[0][0][0] = mx;
yading@10:         s->mv[0][0][1] = my;
yading@10: 
yading@10:         for (i = 0; i < 6; i++) {
yading@10:             if (wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1) < 0)
yading@10:             {
yading@10:                 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding inter block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
yading@10:                 return -1;
yading@10:             }
yading@10:         }
yading@10:     } else {
yading@10:         if (s->pict_type==AV_PICTURE_TYPE_P)
yading@10:             av_dlog(s->avctx, "%d%d ", s->inter_intra_pred, cbp);
yading@10:         av_dlog(s->avctx, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
yading@10:                 ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
yading@10:                 show_bits(&s->gb, 24));
yading@10:         s->ac_pred = get_bits1(&s->gb);
yading@10:         if(s->inter_intra_pred){
yading@10:             s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
yading@10:             av_dlog(s->avctx, "%d%d %d %d/",
yading@10:                     s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
yading@10:         }
yading@10:         if(s->per_mb_rl_table && cbp){
yading@10:             s->rl_table_index = decode012(&s->gb);
yading@10:             s->rl_chroma_table_index = s->rl_table_index;
yading@10:         }
yading@10: 
yading@10:         s->dsp.clear_blocks(s->block[0]);
yading@10:         for (i = 0; i < 6; i++) {
yading@10:             if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
yading@10:             {
yading@10:                 av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding intra block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
yading@10:                 return -1;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int wmv2_decode_init(AVCodecContext *avctx){
yading@10:     Wmv2Context * const w= avctx->priv_data;
yading@10: 
yading@10:     avctx->flags |= CODEC_FLAG_EMU_EDGE;
yading@10: 
yading@10:     if(ff_msmpeg4_decode_init(avctx) < 0)
yading@10:         return -1;
yading@10: 
yading@10:     ff_wmv2_common_init(w);
yading@10: 
yading@10:     ff_intrax8_common_init(&w->x8,&w->s);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int wmv2_decode_end(AVCodecContext *avctx)
yading@10: {
yading@10:     Wmv2Context *w = avctx->priv_data;
yading@10: 
yading@10:     ff_intrax8_common_end(&w->x8);
yading@10:     return ff_h263_decode_end(avctx);
yading@10: }
yading@10: 
yading@10: AVCodec ff_wmv2_decoder = {
yading@10:     .name           = "wmv2",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_WMV2,
yading@10:     .priv_data_size = sizeof(Wmv2Context),
yading@10:     .init           = wmv2_decode_init,
yading@10:     .close          = wmv2_decode_end,
yading@10:     .decode         = ff_h263_decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
yading@10:     .pix_fmts       = ff_pixfmt_list_420,
yading@10: };