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1
/*
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 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
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 * Copyright (c) 2006  Stefan Gehrer <stefan.gehrer@gmx.de>
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 *
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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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 */
21

    
22
/**
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 * @file
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 * Chinese AVS video (AVS1-P2, JiZhun profile) decoder
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 * @author Stefan Gehrer <stefan.gehrer@gmx.de>
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 */
27

    
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#include "avcodec.h"
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#include "get_bits.h"
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#include "golomb.h"
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#include "mathops.h"
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#include "cavs.h"
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#include "cavsdata.h"
34

    
35
/*****************************************************************************
36
 *
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 * in-loop deblocking filter
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 *
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 ****************************************************************************/
40

    
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static inline int get_bs(cavs_vector *mvP, cavs_vector *mvQ, int b) {
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    if((mvP->ref == REF_INTRA) || (mvQ->ref == REF_INTRA))
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        return 2;
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    if( (abs(mvP->x - mvQ->x) >= 4) ||  (abs(mvP->y - mvQ->y) >= 4) )
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        return 1;
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    if(b){
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        mvP += MV_BWD_OFFS;
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        mvQ += MV_BWD_OFFS;
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        if( (abs(mvP->x - mvQ->x) >= 4) ||  (abs(mvP->y - mvQ->y) >= 4) )
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            return 1;
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    }else{
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        if(mvP->ref != mvQ->ref)
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            return 1;
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    }
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    return 0;
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}
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#define SET_PARAMS                                            \
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    alpha = alpha_tab[av_clip(qp_avg + h->alpha_offset,0,63)];   \
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    beta  =  beta_tab[av_clip(qp_avg + h->beta_offset, 0,63)];   \
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    tc    =    tc_tab[av_clip(qp_avg + h->alpha_offset,0,63)];
62

    
63
/**
64
 * in-loop deblocking filter for a single macroblock
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 *
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 * boundary strength (bs) mapping:
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 *
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 * --4---5--
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 * 0   2   |
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 * | 6 | 7 |
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 * 1   3   |
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 * ---------
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 *
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 */
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void ff_cavs_filter(AVSContext *h, enum cavs_mb mb_type) {
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    uint8_t bs[8];
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    int qp_avg, alpha, beta, tc;
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    int i;
79

    
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    /* save un-deblocked lines */
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    h->topleft_border_y = h->top_border_y[h->mbx*16+15];
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    h->topleft_border_u = h->top_border_u[h->mbx*10+8];
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    h->topleft_border_v = h->top_border_v[h->mbx*10+8];
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    memcpy(&h->top_border_y[h->mbx*16], h->cy + 15* h->l_stride,16);
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    memcpy(&h->top_border_u[h->mbx*10+1], h->cu +  7* h->c_stride,8);
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    memcpy(&h->top_border_v[h->mbx*10+1], h->cv +  7* h->c_stride,8);
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    for(i=0;i<8;i++) {
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        h->left_border_y[i*2+1] = *(h->cy + 15 + (i*2+0)*h->l_stride);
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        h->left_border_y[i*2+2] = *(h->cy + 15 + (i*2+1)*h->l_stride);
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        h->left_border_u[i+1] = *(h->cu + 7 + i*h->c_stride);
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        h->left_border_v[i+1] = *(h->cv + 7 + i*h->c_stride);
92
    }
93
    if(!h->loop_filter_disable) {
94
        /* determine bs */
95
        if(mb_type == I_8X8)
96
            memset(bs,2,8);
97
        else{
98
            memset(bs,0,8);
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            if(ff_cavs_partition_flags[mb_type] & SPLITV){
100
                bs[2] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X1], mb_type > P_8X8);
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                bs[3] = get_bs(&h->mv[MV_FWD_X2], &h->mv[MV_FWD_X3], mb_type > P_8X8);
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            }
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            if(ff_cavs_partition_flags[mb_type] & SPLITH){
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                bs[6] = get_bs(&h->mv[MV_FWD_X0], &h->mv[MV_FWD_X2], mb_type > P_8X8);
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                bs[7] = get_bs(&h->mv[MV_FWD_X1], &h->mv[MV_FWD_X3], mb_type > P_8X8);
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            }
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            bs[0] = get_bs(&h->mv[MV_FWD_A1], &h->mv[MV_FWD_X0], mb_type > P_8X8);
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            bs[1] = get_bs(&h->mv[MV_FWD_A3], &h->mv[MV_FWD_X2], mb_type > P_8X8);
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            bs[4] = get_bs(&h->mv[MV_FWD_B2], &h->mv[MV_FWD_X0], mb_type > P_8X8);
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            bs[5] = get_bs(&h->mv[MV_FWD_B3], &h->mv[MV_FWD_X1], mb_type > P_8X8);
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        }
112
        if(AV_RN64(bs)) {
113
            if(h->flags & A_AVAIL) {
114
                qp_avg = (h->qp + h->left_qp + 1) >> 1;
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                SET_PARAMS;
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                h->cdsp.cavs_filter_lv(h->cy,h->l_stride,alpha,beta,tc,bs[0],bs[1]);
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                h->cdsp.cavs_filter_cv(h->cu,h->c_stride,alpha,beta,tc,bs[0],bs[1]);
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                h->cdsp.cavs_filter_cv(h->cv,h->c_stride,alpha,beta,tc,bs[0],bs[1]);
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            }
120
            qp_avg = h->qp;
121
            SET_PARAMS;
122
            h->cdsp.cavs_filter_lv(h->cy + 8,h->l_stride,alpha,beta,tc,bs[2],bs[3]);
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            h->cdsp.cavs_filter_lh(h->cy + 8*h->l_stride,h->l_stride,alpha,beta,tc,
124
                           bs[6],bs[7]);
125

    
126
            if(h->flags & B_AVAIL) {
127
                qp_avg = (h->qp + h->top_qp[h->mbx] + 1) >> 1;
128
                SET_PARAMS;
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                h->cdsp.cavs_filter_lh(h->cy,h->l_stride,alpha,beta,tc,bs[4],bs[5]);
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                h->cdsp.cavs_filter_ch(h->cu,h->c_stride,alpha,beta,tc,bs[4],bs[5]);
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                h->cdsp.cavs_filter_ch(h->cv,h->c_stride,alpha,beta,tc,bs[4],bs[5]);
132
            }
133
        }
134
    }
135
    h->left_qp = h->qp;
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    h->top_qp[h->mbx] = h->qp;
137
}
138

    
139
#undef SET_PARAMS
140

    
141
/*****************************************************************************
142
 *
143
 * spatial intra prediction
144
 *
145
 ****************************************************************************/
146

    
147
void ff_cavs_load_intra_pred_luma(AVSContext *h, uint8_t *top,
148
                                        uint8_t **left, int block) {
149
    int i;
150

    
151
    switch(block) {
152
    case 0:
153
        *left = h->left_border_y;
154
        h->left_border_y[0] = h->left_border_y[1];
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        memset(&h->left_border_y[17],h->left_border_y[16],9);
156
        memcpy(&top[1],&h->top_border_y[h->mbx*16],16);
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        top[17] = top[16];
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        top[0] = top[1];
159
        if((h->flags & A_AVAIL) && (h->flags & B_AVAIL))
160
            h->left_border_y[0] = top[0] = h->topleft_border_y;
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        break;
162
    case 1:
163
        *left = h->intern_border_y;
164
        for(i=0;i<8;i++)
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            h->intern_border_y[i+1] = *(h->cy + 7 + i*h->l_stride);
166
        memset(&h->intern_border_y[9],h->intern_border_y[8],9);
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        h->intern_border_y[0] = h->intern_border_y[1];
168
        memcpy(&top[1],&h->top_border_y[h->mbx*16+8],8);
169
        if(h->flags & C_AVAIL)
170
            memcpy(&top[9],&h->top_border_y[(h->mbx + 1)*16],8);
171
        else
172
            memset(&top[9],top[8],9);
173
        top[17] = top[16];
174
        top[0] = top[1];
175
        if(h->flags & B_AVAIL)
176
            h->intern_border_y[0] = top[0] = h->top_border_y[h->mbx*16+7];
177
        break;
178
    case 2:
179
        *left = &h->left_border_y[8];
180
        memcpy(&top[1],h->cy + 7*h->l_stride,16);
181
        top[17] = top[16];
182
        top[0] = top[1];
183
        if(h->flags & A_AVAIL)
184
            top[0] = h->left_border_y[8];
185
        break;
186
    case 3:
187
        *left = &h->intern_border_y[8];
188
        for(i=0;i<8;i++)
189
            h->intern_border_y[i+9] = *(h->cy + 7 + (i+8)*h->l_stride);
190
        memset(&h->intern_border_y[17],h->intern_border_y[16],9);
191
        memcpy(&top[0],h->cy + 7 + 7*h->l_stride,9);
192
        memset(&top[9],top[8],9);
193
        break;
194
    }
195
}
196

    
197
void ff_cavs_load_intra_pred_chroma(AVSContext *h) {
198
    /* extend borders by one pixel */
199
    h->left_border_u[9] = h->left_border_u[8];
200
    h->left_border_v[9] = h->left_border_v[8];
201
    h->top_border_u[h->mbx*10+9] = h->top_border_u[h->mbx*10+8];
202
    h->top_border_v[h->mbx*10+9] = h->top_border_v[h->mbx*10+8];
203
    if(h->mbx && h->mby) {
204
        h->top_border_u[h->mbx*10] = h->left_border_u[0] = h->topleft_border_u;
205
        h->top_border_v[h->mbx*10] = h->left_border_v[0] = h->topleft_border_v;
206
    } else {
207
        h->left_border_u[0] = h->left_border_u[1];
208
        h->left_border_v[0] = h->left_border_v[1];
209
        h->top_border_u[h->mbx*10] = h->top_border_u[h->mbx*10+1];
210
        h->top_border_v[h->mbx*10] = h->top_border_v[h->mbx*10+1];
211
    }
212
}
213

    
214
static void intra_pred_vert(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
215
    int y;
216
    uint64_t a = AV_RN64(&top[1]);
217
    for(y=0;y<8;y++) {
218
        *((uint64_t *)(d+y*stride)) = a;
219
    }
220
}
221

    
222
static void intra_pred_horiz(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
223
    int y;
224
    uint64_t a;
225
    for(y=0;y<8;y++) {
226
        a = left[y+1] * 0x0101010101010101ULL;
227
        *((uint64_t *)(d+y*stride)) = a;
228
    }
229
}
230

    
231
static void intra_pred_dc_128(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
232
    int y;
233
    uint64_t a = 0x8080808080808080ULL;
234
    for(y=0;y<8;y++)
235
        *((uint64_t *)(d+y*stride)) = a;
236
}
237

    
238
static void intra_pred_plane(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
239
    int x,y,ia;
240
    int ih = 0;
241
    int iv = 0;
242
    uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
243

    
244
    for(x=0; x<4; x++) {
245
        ih += (x+1)*(top[5+x]-top[3-x]);
246
        iv += (x+1)*(left[5+x]-left[3-x]);
247
    }
248
    ia = (top[8]+left[8])<<4;
249
    ih = (17*ih+16)>>5;
250
    iv = (17*iv+16)>>5;
251
    for(y=0; y<8; y++)
252
        for(x=0; x<8; x++)
253
            d[y*stride+x] = cm[(ia+(x-3)*ih+(y-3)*iv+16)>>5];
254
}
255

    
256
#define LOWPASS(ARRAY,INDEX)                                            \
257
    (( ARRAY[(INDEX)-1] + 2*ARRAY[(INDEX)] + ARRAY[(INDEX)+1] + 2) >> 2)
258

    
259
static void intra_pred_lp(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
260
    int x,y;
261
    for(y=0; y<8; y++)
262
        for(x=0; x<8; x++)
263
            d[y*stride+x] = (LOWPASS(top,x+1) + LOWPASS(left,y+1)) >> 1;
264
}
265

    
266
static void intra_pred_down_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
267
    int x,y;
268
    for(y=0; y<8; y++)
269
        for(x=0; x<8; x++)
270
            d[y*stride+x] = (LOWPASS(top,x+y+2) + LOWPASS(left,x+y+2)) >> 1;
271
}
272

    
273
static void intra_pred_down_right(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
274
    int x,y;
275
    for(y=0; y<8; y++)
276
        for(x=0; x<8; x++)
277
            if(x==y)
278
                d[y*stride+x] = (left[1]+2*top[0]+top[1]+2)>>2;
279
            else if(x>y)
280
                d[y*stride+x] = LOWPASS(top,x-y);
281
            else
282
                d[y*stride+x] = LOWPASS(left,y-x);
283
}
284

    
285
static void intra_pred_lp_left(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
286
    int x,y;
287
    for(y=0; y<8; y++)
288
        for(x=0; x<8; x++)
289
            d[y*stride+x] = LOWPASS(left,y+1);
290
}
291

    
292
static void intra_pred_lp_top(uint8_t *d,uint8_t *top,uint8_t *left,int stride) {
293
    int x,y;
294
    for(y=0; y<8; y++)
295
        for(x=0; x<8; x++)
296
            d[y*stride+x] = LOWPASS(top,x+1);
297
}
298

    
299
#undef LOWPASS
300

    
301
void ff_cavs_modify_mb_i(AVSContext *h, int *pred_mode_uv) {
302
    /* save pred modes before they get modified */
303
    h->pred_mode_Y[3] =  h->pred_mode_Y[5];
304
    h->pred_mode_Y[6] =  h->pred_mode_Y[8];
305
    h->top_pred_Y[h->mbx*2+0] = h->pred_mode_Y[7];
306
    h->top_pred_Y[h->mbx*2+1] = h->pred_mode_Y[8];
307

    
308
    /* modify pred modes according to availability of neighbour samples */
309
    if(!(h->flags & A_AVAIL)) {
310
        modify_pred(ff_left_modifier_l, &h->pred_mode_Y[4] );
311
        modify_pred(ff_left_modifier_l, &h->pred_mode_Y[7] );
312
        modify_pred(ff_left_modifier_c, pred_mode_uv );
313
    }
314
    if(!(h->flags & B_AVAIL)) {
315
        modify_pred(ff_top_modifier_l, &h->pred_mode_Y[4] );
316
        modify_pred(ff_top_modifier_l, &h->pred_mode_Y[5] );
317
        modify_pred(ff_top_modifier_c, pred_mode_uv );
318
    }
319
}
320

    
321
/*****************************************************************************
322
 *
323
 * motion compensation
324
 *
325
 ****************************************************************************/
326

    
327
static inline void mc_dir_part(AVSContext *h,Picture *pic,int square,
328
                        int chroma_height,int delta,int list,uint8_t *dest_y,
329
                        uint8_t *dest_cb,uint8_t *dest_cr,int src_x_offset,
330
                        int src_y_offset,qpel_mc_func *qpix_op,
331
                        h264_chroma_mc_func chroma_op,cavs_vector *mv){
332
    MpegEncContext * const s = &h->s;
333
    const int mx= mv->x + src_x_offset*8;
334
    const int my= mv->y + src_y_offset*8;
335
    const int luma_xy= (mx&3) + ((my&3)<<2);
336
    uint8_t * src_y = pic->data[0] + (mx>>2) + (my>>2)*h->l_stride;
337
    uint8_t * src_cb= pic->data[1] + (mx>>3) + (my>>3)*h->c_stride;
338
    uint8_t * src_cr= pic->data[2] + (mx>>3) + (my>>3)*h->c_stride;
339
    int extra_width= 0; //(s->flags&CODEC_FLAG_EMU_EDGE) ? 0 : 16;
340
    int extra_height= extra_width;
341
    int emu=0;
342
    const int full_mx= mx>>2;
343
    const int full_my= my>>2;
344
    const int pic_width  = 16*h->mb_width;
345
    const int pic_height = 16*h->mb_height;
346

    
347
    if(!pic->data[0])
348
        return;
349
    if(mx&7) extra_width -= 3;
350
    if(my&7) extra_height -= 3;
351

    
352
    if(   full_mx < 0-extra_width
353
          || full_my < 0-extra_height
354
          || full_mx + 16/*FIXME*/ > pic_width + extra_width
355
          || full_my + 16/*FIXME*/ > pic_height + extra_height){
356
        s->dsp.emulated_edge_mc(s->edge_emu_buffer, src_y - 2 - 2*h->l_stride, h->l_stride,
357
                            16+5, 16+5/*FIXME*/, full_mx-2, full_my-2, pic_width, pic_height);
358
        src_y= s->edge_emu_buffer + 2 + 2*h->l_stride;
359
        emu=1;
360
    }
361

    
362
    qpix_op[luma_xy](dest_y, src_y, h->l_stride); //FIXME try variable height perhaps?
363
    if(!square){
364
        qpix_op[luma_xy](dest_y + delta, src_y + delta, h->l_stride);
365
    }
366

    
367
    if(emu){
368
        s->dsp.emulated_edge_mc(s->edge_emu_buffer, src_cb, h->c_stride,
369
                            9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);
370
        src_cb= s->edge_emu_buffer;
371
    }
372
    chroma_op(dest_cb, src_cb, h->c_stride, chroma_height, mx&7, my&7);
373

    
374
    if(emu){
375
        s->dsp.emulated_edge_mc(s->edge_emu_buffer, src_cr, h->c_stride,
376
                            9, 9/*FIXME*/, (mx>>3), (my>>3), pic_width>>1, pic_height>>1);
377
        src_cr= s->edge_emu_buffer;
378
    }
379
    chroma_op(dest_cr, src_cr, h->c_stride, chroma_height, mx&7, my&7);
380
}
381

    
382
static inline void mc_part_std(AVSContext *h,int square,int chroma_height,int delta,
383
                        uint8_t *dest_y,uint8_t *dest_cb,uint8_t *dest_cr,
384
                        int x_offset, int y_offset,qpel_mc_func *qpix_put,
385
                        h264_chroma_mc_func chroma_put,qpel_mc_func *qpix_avg,
386
                        h264_chroma_mc_func chroma_avg, cavs_vector *mv){
387
    qpel_mc_func *qpix_op=  qpix_put;
388
    h264_chroma_mc_func chroma_op= chroma_put;
389

    
390
    dest_y  += 2*x_offset + 2*y_offset*h->l_stride;
391
    dest_cb +=   x_offset +   y_offset*h->c_stride;
392
    dest_cr +=   x_offset +   y_offset*h->c_stride;
393
    x_offset += 8*h->mbx;
394
    y_offset += 8*h->mby;
395

    
396
    if(mv->ref >= 0){
397
        Picture *ref= &h->DPB[mv->ref];
398
        mc_dir_part(h, ref, square, chroma_height, delta, 0,
399
                    dest_y, dest_cb, dest_cr, x_offset, y_offset,
400
                    qpix_op, chroma_op, mv);
401

    
402
        qpix_op=  qpix_avg;
403
        chroma_op= chroma_avg;
404
    }
405

    
406
    if((mv+MV_BWD_OFFS)->ref >= 0){
407
        Picture *ref= &h->DPB[0];
408
        mc_dir_part(h, ref, square, chroma_height, delta, 1,
409
                    dest_y, dest_cb, dest_cr, x_offset, y_offset,
410
                    qpix_op, chroma_op, mv+MV_BWD_OFFS);
411
    }
412
}
413

    
414
void ff_cavs_inter(AVSContext *h, enum cavs_mb mb_type) {
415
    if(ff_cavs_partition_flags[mb_type] == 0){ // 16x16
416
        mc_part_std(h, 1, 8, 0, h->cy, h->cu, h->cv, 0, 0,
417
                h->cdsp.put_cavs_qpel_pixels_tab[0],
418
                h->s.dsp.put_h264_chroma_pixels_tab[0],
419
                h->cdsp.avg_cavs_qpel_pixels_tab[0],
420
                h->s.dsp.avg_h264_chroma_pixels_tab[0],&h->mv[MV_FWD_X0]);
421
    }else{
422
        mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 0,
423
                h->cdsp.put_cavs_qpel_pixels_tab[1],
424
                h->s.dsp.put_h264_chroma_pixels_tab[1],
425
                h->cdsp.avg_cavs_qpel_pixels_tab[1],
426
                h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X0]);
427
        mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 0,
428
                h->cdsp.put_cavs_qpel_pixels_tab[1],
429
                h->s.dsp.put_h264_chroma_pixels_tab[1],
430
                h->cdsp.avg_cavs_qpel_pixels_tab[1],
431
                h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X1]);
432
        mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 0, 4,
433
                h->cdsp.put_cavs_qpel_pixels_tab[1],
434
                h->s.dsp.put_h264_chroma_pixels_tab[1],
435
                h->cdsp.avg_cavs_qpel_pixels_tab[1],
436
                h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X2]);
437
        mc_part_std(h, 1, 4, 0, h->cy, h->cu, h->cv, 4, 4,
438
                h->cdsp.put_cavs_qpel_pixels_tab[1],
439
                h->s.dsp.put_h264_chroma_pixels_tab[1],
440
                h->cdsp.avg_cavs_qpel_pixels_tab[1],
441
                h->s.dsp.avg_h264_chroma_pixels_tab[1],&h->mv[MV_FWD_X3]);
442
    }
443
}
444

    
445
/*****************************************************************************
446
 *
447
 * motion vector prediction
448
 *
449
 ****************************************************************************/
450

    
451
static inline void scale_mv(AVSContext *h, int *d_x, int *d_y, cavs_vector *src, int distp) {
452
    int den = h->scale_den[src->ref];
453

    
454
    *d_x = (src->x*distp*den + 256 + (src->x>>31)) >> 9;
455
    *d_y = (src->y*distp*den + 256 + (src->y>>31)) >> 9;
456
}
457

    
458
static inline void mv_pred_median(AVSContext *h, cavs_vector *mvP,
459
                        cavs_vector *mvA, cavs_vector *mvB, cavs_vector *mvC) {
460
    int ax, ay, bx, by, cx, cy;
461
    int len_ab, len_bc, len_ca, len_mid;
462

    
463
    /* scale candidates according to their temporal span */
464
    scale_mv(h, &ax, &ay, mvA, mvP->dist);
465
    scale_mv(h, &bx, &by, mvB, mvP->dist);
466
    scale_mv(h, &cx, &cy, mvC, mvP->dist);
467
    /* find the geometrical median of the three candidates */
468
    len_ab = abs(ax - bx) + abs(ay - by);
469
    len_bc = abs(bx - cx) + abs(by - cy);
470
    len_ca = abs(cx - ax) + abs(cy - ay);
471
    len_mid = mid_pred(len_ab, len_bc, len_ca);
472
    if(len_mid == len_ab) {
473
        mvP->x = cx;
474
        mvP->y = cy;
475
    } else if(len_mid == len_bc) {
476
        mvP->x = ax;
477
        mvP->y = ay;
478
    } else {
479
        mvP->x = bx;
480
        mvP->y = by;
481
    }
482
}
483

    
484
void ff_cavs_mv(AVSContext *h, enum cavs_mv_loc nP, enum cavs_mv_loc nC,
485
                enum cavs_mv_pred mode, enum cavs_block size, int ref) {
486
    cavs_vector *mvP = &h->mv[nP];
487
    cavs_vector *mvA = &h->mv[nP-1];
488
    cavs_vector *mvB = &h->mv[nP-4];
489
    cavs_vector *mvC = &h->mv[nC];
490
    const cavs_vector *mvP2 = NULL;
491

    
492
    mvP->ref = ref;
493
    mvP->dist = h->dist[mvP->ref];
494
    if(mvC->ref == NOT_AVAIL)
495
        mvC = &h->mv[nP-5]; // set to top-left (mvD)
496
    if((mode == MV_PRED_PSKIP) &&
497
       ((mvA->ref == NOT_AVAIL) || (mvB->ref == NOT_AVAIL) ||
498
           ((mvA->x | mvA->y | mvA->ref) == 0)  ||
499
           ((mvB->x | mvB->y | mvB->ref) == 0) )) {
500
        mvP2 = &ff_cavs_un_mv;
501
    /* if there is only one suitable candidate, take it */
502
    } else if((mvA->ref >= 0) && (mvB->ref < 0) && (mvC->ref < 0)) {
503
        mvP2= mvA;
504
    } else if((mvA->ref < 0) && (mvB->ref >= 0) && (mvC->ref < 0)) {
505
        mvP2= mvB;
506
    } else if((mvA->ref < 0) && (mvB->ref < 0) && (mvC->ref >= 0)) {
507
        mvP2= mvC;
508
    } else if(mode == MV_PRED_LEFT     && mvA->ref == ref){
509
        mvP2= mvA;
510
    } else if(mode == MV_PRED_TOP      && mvB->ref == ref){
511
        mvP2= mvB;
512
    } else if(mode == MV_PRED_TOPRIGHT && mvC->ref == ref){
513
        mvP2= mvC;
514
    }
515
    if(mvP2){
516
        mvP->x = mvP2->x;
517
        mvP->y = mvP2->y;
518
    }else
519
        mv_pred_median(h, mvP, mvA, mvB, mvC);
520

    
521
    if(mode < MV_PRED_PSKIP) {
522
        mvP->x += get_se_golomb(&h->s.gb);
523
        mvP->y += get_se_golomb(&h->s.gb);
524
    }
525
    set_mvs(mvP,size);
526
}
527

    
528
/*****************************************************************************
529
 *
530
 * macroblock level
531
 *
532
 ****************************************************************************/
533

    
534
/**
535
 * initialise predictors for motion vectors and intra prediction
536
 */
537
void ff_cavs_init_mb(AVSContext *h) {
538
    int i;
539

    
540
    /* copy predictors from top line (MB B and C) into cache */
541
    for(i=0;i<3;i++) {
542
        h->mv[MV_FWD_B2+i] = h->top_mv[0][h->mbx*2+i];
543
        h->mv[MV_BWD_B2+i] = h->top_mv[1][h->mbx*2+i];
544
    }
545
    h->pred_mode_Y[1] = h->top_pred_Y[h->mbx*2+0];
546
    h->pred_mode_Y[2] = h->top_pred_Y[h->mbx*2+1];
547
    /* clear top predictors if MB B is not available */
548
    if(!(h->flags & B_AVAIL)) {
549
        h->mv[MV_FWD_B2] = ff_cavs_un_mv;
550
        h->mv[MV_FWD_B3] = ff_cavs_un_mv;
551
        h->mv[MV_BWD_B2] = ff_cavs_un_mv;
552
        h->mv[MV_BWD_B3] = ff_cavs_un_mv;
553
        h->pred_mode_Y[1] = h->pred_mode_Y[2] = NOT_AVAIL;
554
        h->flags &= ~(C_AVAIL|D_AVAIL);
555
    } else if(h->mbx) {
556
        h->flags |= D_AVAIL;
557
    }
558
    if(h->mbx == h->mb_width-1) //MB C not available
559
        h->flags &= ~C_AVAIL;
560
    /* clear top-right predictors if MB C is not available */
561
    if(!(h->flags & C_AVAIL)) {
562
        h->mv[MV_FWD_C2] = ff_cavs_un_mv;
563
        h->mv[MV_BWD_C2] = ff_cavs_un_mv;
564
    }
565
    /* clear top-left predictors if MB D is not available */
566
    if(!(h->flags & D_AVAIL)) {
567
        h->mv[MV_FWD_D3] = ff_cavs_un_mv;
568
        h->mv[MV_BWD_D3] = ff_cavs_un_mv;
569
    }
570
}
571

    
572
/**
573
 * save predictors for later macroblocks and increase
574
 * macroblock address
575
 * @return 0 if end of frame is reached, 1 otherwise
576
 */
577
int ff_cavs_next_mb(AVSContext *h) {
578
    int i;
579

    
580
    h->flags |= A_AVAIL;
581
    h->cy += 16;
582
    h->cu += 8;
583
    h->cv += 8;
584
    /* copy mvs as predictors to the left */
585
    for(i=0;i<=20;i+=4)
586
        h->mv[i] = h->mv[i+2];
587
    /* copy bottom mvs from cache to top line */
588
    h->top_mv[0][h->mbx*2+0] = h->mv[MV_FWD_X2];
589
    h->top_mv[0][h->mbx*2+1] = h->mv[MV_FWD_X3];
590
    h->top_mv[1][h->mbx*2+0] = h->mv[MV_BWD_X2];
591
    h->top_mv[1][h->mbx*2+1] = h->mv[MV_BWD_X3];
592
    /* next MB address */
593
    h->mbidx++;
594
    h->mbx++;
595
    if(h->mbx == h->mb_width) { //new mb line
596
        h->flags = B_AVAIL|C_AVAIL;
597
        /* clear left pred_modes */
598
        h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
599
        /* clear left mv predictors */
600
        for(i=0;i<=20;i+=4)
601
            h->mv[i] = ff_cavs_un_mv;
602
        h->mbx = 0;
603
        h->mby++;
604
        /* re-calculate sample pointers */
605
        h->cy = h->picture.data[0] + h->mby*16*h->l_stride;
606
        h->cu = h->picture.data[1] + h->mby*8*h->c_stride;
607
        h->cv = h->picture.data[2] + h->mby*8*h->c_stride;
608
        if(h->mby == h->mb_height) { //frame end
609
            return 0;
610
        }
611
    }
612
    return 1;
613
}
614

    
615
/*****************************************************************************
616
 *
617
 * frame level
618
 *
619
 ****************************************************************************/
620

    
621
void ff_cavs_init_pic(AVSContext *h) {
622
    int i;
623

    
624
    /* clear some predictors */
625
    for(i=0;i<=20;i+=4)
626
        h->mv[i] = ff_cavs_un_mv;
627
    h->mv[MV_BWD_X0] = ff_cavs_dir_mv;
628
    set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
629
    h->mv[MV_FWD_X0] = ff_cavs_dir_mv;
630
    set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
631
    h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
632
    h->cy = h->picture.data[0];
633
    h->cu = h->picture.data[1];
634
    h->cv = h->picture.data[2];
635
    h->l_stride = h->picture.linesize[0];
636
    h->c_stride = h->picture.linesize[1];
637
    h->luma_scan[2] = 8*h->l_stride;
638
    h->luma_scan[3] = 8*h->l_stride+8;
639
    h->mbx = h->mby = h->mbidx = 0;
640
    h->flags = 0;
641
}
642

    
643
/*****************************************************************************
644
 *
645
 * headers and interface
646
 *
647
 ****************************************************************************/
648

    
649
/**
650
 * some predictions require data from the top-neighbouring macroblock.
651
 * this data has to be stored for one complete row of macroblocks
652
 * and this storage space is allocated here
653
 */
654
void ff_cavs_init_top_lines(AVSContext *h) {
655
    /* alloc top line of predictors */
656
    h->top_qp       = av_malloc( h->mb_width);
657
    h->top_mv[0]    = av_malloc((h->mb_width*2+1)*sizeof(cavs_vector));
658
    h->top_mv[1]    = av_malloc((h->mb_width*2+1)*sizeof(cavs_vector));
659
    h->top_pred_Y   = av_malloc( h->mb_width*2*sizeof(*h->top_pred_Y));
660
    h->top_border_y = av_malloc((h->mb_width+1)*16);
661
    h->top_border_u = av_malloc((h->mb_width)*10);
662
    h->top_border_v = av_malloc((h->mb_width)*10);
663

    
664
    /* alloc space for co-located MVs and types */
665
    h->col_mv       = av_malloc( h->mb_width*h->mb_height*4*sizeof(cavs_vector));
666
    h->col_type_base = av_malloc(h->mb_width*h->mb_height);
667
    h->block        = av_mallocz(64*sizeof(DCTELEM));
668
}
669

    
670
av_cold int ff_cavs_init(AVCodecContext *avctx) {
671
    AVSContext *h = avctx->priv_data;
672
    MpegEncContext * const s = &h->s;
673

    
674
    MPV_decode_defaults(s);
675
    ff_cavsdsp_init(&h->cdsp, avctx);
676
    s->avctx = avctx;
677

    
678
    avctx->pix_fmt= PIX_FMT_YUV420P;
679

    
680
    h->luma_scan[0] = 0;
681
    h->luma_scan[1] = 8;
682
    h->intra_pred_l[      INTRA_L_VERT] = intra_pred_vert;
683
    h->intra_pred_l[     INTRA_L_HORIZ] = intra_pred_horiz;
684
    h->intra_pred_l[        INTRA_L_LP] = intra_pred_lp;
685
    h->intra_pred_l[ INTRA_L_DOWN_LEFT] = intra_pred_down_left;
686
    h->intra_pred_l[INTRA_L_DOWN_RIGHT] = intra_pred_down_right;
687
    h->intra_pred_l[   INTRA_L_LP_LEFT] = intra_pred_lp_left;
688
    h->intra_pred_l[    INTRA_L_LP_TOP] = intra_pred_lp_top;
689
    h->intra_pred_l[    INTRA_L_DC_128] = intra_pred_dc_128;
690
    h->intra_pred_c[        INTRA_C_LP] = intra_pred_lp;
691
    h->intra_pred_c[     INTRA_C_HORIZ] = intra_pred_horiz;
692
    h->intra_pred_c[      INTRA_C_VERT] = intra_pred_vert;
693
    h->intra_pred_c[     INTRA_C_PLANE] = intra_pred_plane;
694
    h->intra_pred_c[   INTRA_C_LP_LEFT] = intra_pred_lp_left;
695
    h->intra_pred_c[    INTRA_C_LP_TOP] = intra_pred_lp_top;
696
    h->intra_pred_c[    INTRA_C_DC_128] = intra_pred_dc_128;
697
    h->mv[ 7] = ff_cavs_un_mv;
698
    h->mv[19] = ff_cavs_un_mv;
699
    return 0;
700
}
701

    
702
av_cold int ff_cavs_end(AVCodecContext *avctx) {
703
    AVSContext *h = avctx->priv_data;
704

    
705
    av_free(h->top_qp);
706
    av_free(h->top_mv[0]);
707
    av_free(h->top_mv[1]);
708
    av_free(h->top_pred_Y);
709
    av_free(h->top_border_y);
710
    av_free(h->top_border_u);
711
    av_free(h->top_border_v);
712
    av_free(h->col_mv);
713
    av_free(h->col_type_base);
714
    av_free(h->block);
715
    return 0;
716
}