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1
/*
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 * Copyright (c) 2002 The Libav Project
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#include "h263.h"
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#include "mathops.h"
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#include "msmpeg4.h"
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#include "msmpeg4data.h"
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#include "intrax8.h"
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#include "wmv2.h"
30

    
31

    
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static void parse_mb_skip(Wmv2Context * w){
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    int mb_x, mb_y;
34
    MpegEncContext * const s= &w->s;
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    uint32_t * const mb_type= s->current_picture_ptr->mb_type;
36

    
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    w->skip_type= get_bits(&s->gb, 2);
38
    switch(w->skip_type){
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    case SKIP_TYPE_NONE:
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        for(mb_y=0; mb_y<s->mb_height; mb_y++){
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            for(mb_x=0; mb_x<s->mb_width; mb_x++){
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                mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_16x16 | MB_TYPE_L0;
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            }
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        }
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        break;
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    case SKIP_TYPE_MPEG:
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        for(mb_y=0; mb_y<s->mb_height; mb_y++){
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            for(mb_x=0; mb_x<s->mb_width; mb_x++){
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                mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
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            }
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        }
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        break;
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    case SKIP_TYPE_ROW:
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        for(mb_y=0; mb_y<s->mb_height; mb_y++){
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            if(get_bits1(&s->gb)){
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                for(mb_x=0; mb_x<s->mb_width; mb_x++){
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                    mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
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                }
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            }else{
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                for(mb_x=0; mb_x<s->mb_width; mb_x++){
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                    mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
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                }
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            }
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        }
65
        break;
66
    case SKIP_TYPE_COL:
67
        for(mb_x=0; mb_x<s->mb_width; mb_x++){
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            if(get_bits1(&s->gb)){
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                for(mb_y=0; mb_y<s->mb_height; mb_y++){
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                    mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
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                }
72
            }else{
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                for(mb_y=0; mb_y<s->mb_height; mb_y++){
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                    mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
75
                }
76
            }
77
        }
78
        break;
79
    }
80
}
81

    
82
static int decode_ext_header(Wmv2Context *w){
83
    MpegEncContext * const s= &w->s;
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    GetBitContext gb;
85
    int fps;
86
    int code;
87

    
88
    if(s->avctx->extradata_size<4) return -1;
89

    
90
    init_get_bits(&gb, s->avctx->extradata, 32);
91

    
92
    fps                = get_bits(&gb, 5);
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    s->bit_rate        = get_bits(&gb, 11)*1024;
94
    w->mspel_bit       = get_bits1(&gb);
95
    s->loop_filter     = get_bits1(&gb);
96
    w->abt_flag        = get_bits1(&gb);
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    w->j_type_bit      = get_bits1(&gb);
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    w->top_left_mv_flag= get_bits1(&gb);
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    w->per_mb_rl_bit   = get_bits1(&gb);
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    code               = get_bits(&gb, 3);
101

    
102
    if(code==0) return -1;
103

    
104
    s->slice_height = s->mb_height / code;
105

    
106
    if(s->avctx->debug&FF_DEBUG_PICT_INFO){
107
        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",
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        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,
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        code);
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    }
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    return 0;
112
}
113

    
114
int ff_wmv2_decode_picture_header(MpegEncContext * s)
115
{
116
    Wmv2Context * const w= (Wmv2Context*)s;
117
    int code;
118

    
119
#if 0
120
{
121
int i;
122
for(i=0; i<s->gb.size*8; i++)
123
    printf("%d", get_bits1(&s->gb));
124
//    get_bits1(&s->gb);
125
printf("END\n");
126
return -1;
127
}
128
#endif
129
    if(s->picture_number==0)
130
        decode_ext_header(w);
131

    
132
    s->pict_type = get_bits1(&s->gb) + 1;
133
    if(s->pict_type == FF_I_TYPE){
134
        code = get_bits(&s->gb, 7);
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        av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
136
    }
137
    s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
138
    if(s->qscale <= 0)
139
       return -1;
140

    
141
    return 0;
142
}
143

    
144
int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s)
145
{
146
    Wmv2Context * const w= (Wmv2Context*)s;
147

    
148
    if (s->pict_type == FF_I_TYPE) {
149
        if(w->j_type_bit) w->j_type= get_bits1(&s->gb);
150
        else              w->j_type= 0; //FIXME check
151

    
152
        if(!w->j_type){
153
            if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);
154
            else                 s->per_mb_rl_table= 0;
155

    
156
            if(!s->per_mb_rl_table){
157
                s->rl_chroma_table_index = decode012(&s->gb);
158
                s->rl_table_index = decode012(&s->gb);
159
            }
160

    
161
            s->dc_table_index = get_bits1(&s->gb);
162
        }
163
        s->inter_intra_pred= 0;
164
        s->no_rounding = 1;
165
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
166
            av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
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                s->qscale,
168
                s->rl_chroma_table_index,
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                s->rl_table_index,
170
                s->dc_table_index,
171
                s->per_mb_rl_table,
172
                w->j_type);
173
        }
174
    }else{
175
        int cbp_index;
176
        w->j_type=0;
177

    
178
        parse_mb_skip(w);
179
        cbp_index= decode012(&s->gb);
180
        if(s->qscale <= 10){
181
            int map[3]= {0,2,1};
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            w->cbp_table_index= map[cbp_index];
183
        }else if(s->qscale <= 20){
184
            int map[3]= {1,0,2};
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            w->cbp_table_index= map[cbp_index];
186
        }else{
187
            int map[3]= {2,1,0};
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            w->cbp_table_index= map[cbp_index];
189
        }
190

    
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        if(w->mspel_bit) s->mspel= get_bits1(&s->gb);
192
        else             s->mspel= 0; //FIXME check
193

    
194
        if(w->abt_flag){
195
            w->per_mb_abt= get_bits1(&s->gb)^1;
196
            if(!w->per_mb_abt){
197
                w->abt_type= decode012(&s->gb);
198
            }
199
        }
200

    
201
        if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);
202
        else                 s->per_mb_rl_table= 0;
203

    
204
        if(!s->per_mb_rl_table){
205
            s->rl_table_index = decode012(&s->gb);
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            s->rl_chroma_table_index = s->rl_table_index;
207
        }
208

    
209
        s->dc_table_index = get_bits1(&s->gb);
210
        s->mv_table_index = get_bits1(&s->gb);
211

    
212
        s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
213
        s->no_rounding ^= 1;
214

    
215
        if(s->avctx->debug&FF_DEBUG_PICT_INFO){
216
            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",
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                s->rl_table_index,
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                s->rl_chroma_table_index,
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                s->dc_table_index,
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                s->mv_table_index,
221
                s->per_mb_rl_table,
222
                s->qscale,
223
                s->mspel,
224
                w->per_mb_abt,
225
                w->abt_type,
226
                w->cbp_table_index,
227
                s->inter_intra_pred);
228
        }
229
    }
230
    s->esc3_level_length= 0;
231
    s->esc3_run_length= 0;
232

    
233
s->picture_number++; //FIXME ?
234

    
235

    
236
    if(w->j_type){
237
        ff_intrax8_decode_picture(&w->x8, 2*s->qscale, (s->qscale-1)|1 );
238
        return 1;
239
    }
240

    
241
    return 0;
242
}
243

    
244
static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr){
245
    MpegEncContext * const s= &w->s;
246
    int ret;
247

    
248
    ret= ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
249

    
250
    if(ret<0) return -1;
251

    
252
    if((((*mx_ptr)|(*my_ptr)) & 1) && s->mspel)
253
        w->hshift= get_bits1(&s->gb);
254
    else
255
        w->hshift= 0;
256

    
257
//printf("%d %d  ", *mx_ptr, *my_ptr);
258

    
259
    return 0;
260
}
261

    
262
static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py){
263
    MpegEncContext * const s= &w->s;
264
    int xy, wrap, diff, type;
265
    int16_t *A, *B, *C, *mot_val;
266

    
267
    wrap = s->b8_stride;
268
    xy = s->block_index[0];
269

    
270
    mot_val = s->current_picture.motion_val[0][xy];
271

    
272
    A = s->current_picture.motion_val[0][xy - 1];
273
    B = s->current_picture.motion_val[0][xy - wrap];
274
    C = s->current_picture.motion_val[0][xy + 2 - wrap];
275

    
276
    if(s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
277
        diff= FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
278
    else
279
        diff=0;
280

    
281
    if(diff >= 8)
282
        type= get_bits1(&s->gb);
283
    else
284
        type= 2;
285

    
286
    if(type == 0){
287
        *px= A[0];
288
        *py= A[1];
289
    }else if(type == 1){
290
        *px= B[0];
291
        *py= B[1];
292
    }else{
293
        /* special case for first (slice) line */
294
        if (s->first_slice_line) {
295
            *px = A[0];
296
            *py = A[1];
297
        } else {
298
            *px = mid_pred(A[0], B[0], C[0]);
299
            *py = mid_pred(A[1], B[1], C[1]);
300
        }
301
    }
302

    
303
    return mot_val;
304
}
305

    
306
static inline int wmv2_decode_inter_block(Wmv2Context *w, DCTELEM *block, int n, int cbp){
307
    MpegEncContext * const s= &w->s;
308
    static const int sub_cbp_table[3]= {2,3,1};
309
    int sub_cbp;
310

    
311
    if(!cbp){
312
        s->block_last_index[n] = -1;
313

    
314
        return 0;
315
    }
316

    
317
    if(w->per_block_abt)
318
        w->abt_type= decode012(&s->gb);
319
#if 0
320
    if(w->per_block_abt)
321
        printf("B%d", w->abt_type);
322
#endif
323
    w->abt_type_table[n]= w->abt_type;
324

    
325
    if(w->abt_type){
326
//        const uint8_t *scantable= w->abt_scantable[w->abt_type-1].permutated;
327
        const uint8_t *scantable= w->abt_scantable[w->abt_type-1].scantable;
328
//        const uint8_t *scantable= w->abt_type-1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;
329

    
330
        sub_cbp= sub_cbp_table[ decode012(&s->gb) ];
331
//        printf("S%d", sub_cbp);
332

    
333
        if(sub_cbp&1){
334
            if (ff_msmpeg4_decode_block(s, block, n, 1, scantable) < 0)
335
                return -1;
336
        }
337

    
338
        if(sub_cbp&2){
339
            if (ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable) < 0)
340
                return -1;
341
        }
342
        s->block_last_index[n] = 63;
343

    
344
        return 0;
345
    }else{
346
        return ff_msmpeg4_decode_block(s, block, n, 1, s->inter_scantable.permutated);
347
    }
348
}
349

    
350

    
351
int ff_wmv2_decode_mb(MpegEncContext *s, DCTELEM block[6][64])
352
{
353
    Wmv2Context * const w= (Wmv2Context*)s;
354
    int cbp, code, i;
355
    uint8_t *coded_val;
356

    
357
    if(w->j_type) return 0;
358

    
359
    if (s->pict_type == FF_P_TYPE) {
360
        if(IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])){
361
            /* skip mb */
362
            s->mb_intra = 0;
363
            for(i=0;i<6;i++)
364
                s->block_last_index[i] = -1;
365
            s->mv_dir = MV_DIR_FORWARD;
366
            s->mv_type = MV_TYPE_16X16;
367
            s->mv[0][0][0] = 0;
368
            s->mv[0][0][1] = 0;
369
            s->mb_skipped = 1;
370
            w->hshift=0;
371
            return 0;
372
        }
373

    
374
        code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table, MB_NON_INTRA_VLC_BITS, 3);
375
        if (code < 0)
376
            return -1;
377
        s->mb_intra = (~code & 0x40) >> 6;
378

    
379
        cbp = code & 0x3f;
380
    } else {
381
        s->mb_intra = 1;
382
        code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
383
        if (code < 0){
384
            av_log(s->avctx, AV_LOG_ERROR, "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);
385
            return -1;
386
        }
387
        /* predict coded block pattern */
388
        cbp = 0;
389
        for(i=0;i<6;i++) {
390
            int val = ((code >> (5 - i)) & 1);
391
            if (i < 4) {
392
                int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
393
                val = val ^ pred;
394
                *coded_val = val;
395
            }
396
            cbp |= val << (5 - i);
397
        }
398
    }
399

    
400
    if (!s->mb_intra) {
401
        int mx, my;
402
//printf("P at %d %d\n", s->mb_x, s->mb_y);
403
        wmv2_pred_motion(w, &mx, &my);
404

    
405
        if(cbp){
406
            s->dsp.clear_blocks(s->block[0]);
407
            if(s->per_mb_rl_table){
408
                s->rl_table_index = decode012(&s->gb);
409
                s->rl_chroma_table_index = s->rl_table_index;
410
            }
411

    
412
            if(w->abt_flag && w->per_mb_abt){
413
                w->per_block_abt= get_bits1(&s->gb);
414
                if(!w->per_block_abt)
415
                    w->abt_type= decode012(&s->gb);
416
            }else
417
                w->per_block_abt=0;
418
        }
419

    
420
        if (wmv2_decode_motion(w, &mx, &my) < 0)
421
            return -1;
422

    
423
        s->mv_dir = MV_DIR_FORWARD;
424
        s->mv_type = MV_TYPE_16X16;
425
        s->mv[0][0][0] = mx;
426
        s->mv[0][0][1] = my;
427

    
428
        for (i = 0; i < 6; i++) {
429
            if (wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1) < 0)
430
            {
431
                av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding inter block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
432
                return -1;
433
            }
434
        }
435
    } else {
436
//if(s->pict_type==FF_P_TYPE)
437
//   printf("%d%d ", s->inter_intra_pred, cbp);
438
//printf("I at %d %d %d %06X\n", s->mb_x, s->mb_y, ((cbp&3)? 1 : 0) +((cbp&0x3C)? 2 : 0), show_bits(&s->gb, 24));
439
        s->ac_pred = get_bits1(&s->gb);
440
        if(s->inter_intra_pred){
441
            s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);
442
//            printf("%d%d %d %d/", s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
443
        }
444
        if(s->per_mb_rl_table && cbp){
445
            s->rl_table_index = decode012(&s->gb);
446
            s->rl_chroma_table_index = s->rl_table_index;
447
        }
448

    
449
        s->dsp.clear_blocks(s->block[0]);
450
        for (i = 0; i < 6; i++) {
451
            if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
452
            {
453
                av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding intra block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
454
                return -1;
455
            }
456
        }
457
    }
458

    
459
    return 0;
460
}
461

    
462
static av_cold int wmv2_decode_init(AVCodecContext *avctx){
463
    Wmv2Context * const w= avctx->priv_data;
464

    
465
    if(avctx->idct_algo==FF_IDCT_AUTO){
466
        avctx->idct_algo=FF_IDCT_WMV2;
467
    }
468

    
469
    if(ff_msmpeg4_decode_init(avctx) < 0)
470
        return -1;
471

    
472
    ff_wmv2_common_init(w);
473

    
474
    ff_intrax8_common_init(&w->x8,&w->s);
475

    
476
    return 0;
477
}
478

    
479
static av_cold int wmv2_decode_end(AVCodecContext *avctx)
480
{
481
    Wmv2Context *w = avctx->priv_data;
482

    
483
    ff_intrax8_common_end(&w->x8);
484
    return ff_h263_decode_end(avctx);
485
}
486

    
487
AVCodec ff_wmv2_decoder = {
488
    "wmv2",
489
    AVMEDIA_TYPE_VIDEO,
490
    CODEC_ID_WMV2,
491
    sizeof(Wmv2Context),
492
    wmv2_decode_init,
493
    NULL,
494
    wmv2_decode_end,
495
    ff_h263_decode_frame,
496
    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,
497
    .max_lowres = 3,
498
    .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
499
    .pix_fmts= ff_pixfmt_list_420,
500
};