h263.c 143 KB
Newer Older
Fabrice Bellard's avatar
Fabrice Bellard committed
1 2
/*
 * H263/MPEG4 backend for ffmpeg encoder and decoder
Fabrice Bellard's avatar
Fabrice Bellard committed
3
 * Copyright (c) 2000,2001 Fabrice Bellard.
4
 * H263+ support.
Fabrice Bellard's avatar
Fabrice Bellard committed
5 6
 * Copyright (c) 2001 Juan J. Sierralta P.
 *
Fabrice Bellard's avatar
Fabrice Bellard committed
7 8 9 10
 * This library 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 of the License, or (at your option) any later version.
Fabrice Bellard's avatar
Fabrice Bellard committed
11
 *
Fabrice Bellard's avatar
Fabrice Bellard committed
12
 * This library is distributed in the hope that it will be useful,
Fabrice Bellard's avatar
Fabrice Bellard committed
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
Fabrice Bellard's avatar
Fabrice Bellard committed
14 15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
Fabrice Bellard's avatar
Fabrice Bellard committed
16
 *
Fabrice Bellard's avatar
Fabrice Bellard committed
17 18 19
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
20
 *
21
 * ac prediction encoding & b-frame support by Michael Niedermayer <michaelni@gmx.at>
Fabrice Bellard's avatar
Fabrice Bellard committed
22
 */
23 24
 
//#define DEBUG
Fabrice Bellard's avatar
Fabrice Bellard committed
25 26 27 28 29 30 31
#include "common.h"
#include "dsputil.h"
#include "avcodec.h"
#include "mpegvideo.h"
#include "h263data.h"
#include "mpeg4data.h"

Michael Niedermayer's avatar
Michael Niedermayer committed
32 33 34
//rounded divison & shift
#define RSHIFT(a,b) ((a) > 0 ? ((a) + (1<<((b)-1)))>>(b) : ((a) + (1<<((b)-1))-1)>>(b))

Felix Bünemann's avatar
Felix Bünemann committed
35 36
#define PRINT_MB_TYPE(a) {}
//#define PRINT_MB_TYPE(a) printf(a)
Michael Niedermayer's avatar
Michael Niedermayer committed
37

38 39 40 41 42 43 44 45 46
#define INTRA_MCBPC_VLC_BITS 6
#define INTER_MCBPC_VLC_BITS 6
#define CBPY_VLC_BITS 6
#define MV_VLC_BITS 9
#define DC_VLC_BITS 9
#define SPRITE_TRAJ_VLC_BITS 6
#define MB_TYPE_B_VLC_BITS 4
#define TEX_VLC_BITS 9

Fabrice Bellard's avatar
Fabrice Bellard committed
47 48
static void h263_encode_block(MpegEncContext * s, DCTELEM * block,
			      int n);
49
static void h263_encode_motion(MpegEncContext * s, int val, int fcode);
50
static void h263p_encode_umotion(MpegEncContext * s, int val);
51
static inline void mpeg4_encode_block(MpegEncContext * s, DCTELEM * block,
52 53
			       int n, int dc, UINT8 *scan_table, 
                               PutBitContext *dc_pb, PutBitContext *ac_pb);
Michael Niedermayer's avatar
Michael Niedermayer committed
54
static int h263_decode_motion(MpegEncContext * s, int pred, int fcode);
55
static int h263p_decode_umotion(MpegEncContext * s, int pred);
Fabrice Bellard's avatar
Fabrice Bellard committed
56 57
static int h263_decode_block(MpegEncContext * s, DCTELEM * block,
                             int n, int coded);
58 59
static inline int mpeg4_decode_dc(MpegEncContext * s, int n, int *dir_ptr);
static inline int mpeg4_decode_block(MpegEncContext * s, DCTELEM * block,
Michael Niedermayer's avatar
Michael Niedermayer committed
60
                              int n, int coded, int intra);
61
static int h263_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_ptr);
62 63
static void mpeg4_inv_pred_ac(MpegEncContext * s, INT16 *block, int n,
                              int dir);
64 65
static void mpeg4_decode_sprite_trajectory(MpegEncContext * s);

66
extern UINT32 inverse[256];
Fabrice Bellard's avatar
Fabrice Bellard committed
67

68
static UINT16 mv_penalty[MAX_FCODE+1][MAX_MV*2+1];
69
static UINT8 fcode_tab[MAX_MV*2+1];
70
static UINT8 umv_fcode_tab[MAX_MV*2+1];
71

72 73
static UINT16 uni_DCtab_lum  [512][2];
static UINT16 uni_DCtab_chrom[512][2];
74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89
static UINT32 uni_mpeg4_intra_rl_bits[64*64*2*2];
static UINT8  uni_mpeg4_intra_rl_len [64*64*2*2];
static UINT32 uni_mpeg4_inter_rl_bits[64*64*2*2];
static UINT8  uni_mpeg4_inter_rl_len [64*64*2*2];
#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128 + (run)*256 + (level))
//#define UNI_MPEG4_ENC_INDEX(last,run,level) ((last)*128*64 + (run) + (level)*64)

/* mpeg4
inter
max level: 24/6
max run: 53/63

intra
max level: 53/16
max run: 29/41
*/
90

Fabrice Bellard's avatar
Fabrice Bellard committed
91 92 93 94 95
int h263_get_picture_format(int width, int height)
{
    int format;

    if (width == 128 && height == 96)
96
        format = 1;
Fabrice Bellard's avatar
Fabrice Bellard committed
97
    else if (width == 176 && height == 144)
98
        format = 2;
Fabrice Bellard's avatar
Fabrice Bellard committed
99
    else if (width == 352 && height == 288)
100
        format = 3;
Fabrice Bellard's avatar
Fabrice Bellard committed
101
    else if (width == 704 && height == 576)
102
        format = 4;
Fabrice Bellard's avatar
Fabrice Bellard committed
103
    else if (width == 1408 && height == 1152)
104
        format = 5;
Fabrice Bellard's avatar
Fabrice Bellard committed
105 106 107 108 109 110 111
    else
        format = 7;
    return format;
}

void h263_encode_picture_header(MpegEncContext * s, int picture_number)
{
112
    int format;
Fabrice Bellard's avatar
Fabrice Bellard committed
113 114

    align_put_bits(&s->pb);
115 116

    /* Update the pointer to last GOB */
117
    s->ptr_lastgob = pbBufPtr(&s->pb);
118 119 120
    s->gob_number = 0;

    put_bits(&s->pb, 22, 0x20); /* PSC */
121
    put_bits(&s->pb, 8, (((INT64)s->picture_number * 30 * FRAME_RATE_BASE) / 
Fabrice Bellard's avatar
Fabrice Bellard committed
122 123 124 125 126 127 128
                         s->frame_rate) & 0xff);

    put_bits(&s->pb, 1, 1);	/* marker */
    put_bits(&s->pb, 1, 0);	/* h263 id */
    put_bits(&s->pb, 1, 0);	/* split screen off */
    put_bits(&s->pb, 1, 0);	/* camera  off */
    put_bits(&s->pb, 1, 0);	/* freeze picture release off */
129 130
    
    format = h263_get_picture_format(s->width, s->height);
Fabrice Bellard's avatar
Fabrice Bellard committed
131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148
    if (!s->h263_plus) {
        /* H.263v1 */
        put_bits(&s->pb, 3, format);
        put_bits(&s->pb, 1, (s->pict_type == P_TYPE));
        /* By now UMV IS DISABLED ON H.263v1, since the restrictions
        of H.263v1 UMV implies to check the predicted MV after
        calculation of the current MB to see if we're on the limits */
        put_bits(&s->pb, 1, 0);	/* unrestricted motion vector: off */
        put_bits(&s->pb, 1, 0);	/* SAC: off */
        put_bits(&s->pb, 1, 0);	/* advanced prediction mode: off */
        put_bits(&s->pb, 1, 0);	/* not PB frame */
        put_bits(&s->pb, 5, s->qscale);
        put_bits(&s->pb, 1, 0);	/* Continuous Presence Multipoint mode: off */
    } else {
        /* H.263v2 */
        /* H.263 Plus PTYPE */
        put_bits(&s->pb, 3, 7);
        put_bits(&s->pb,3,1); /* Update Full Extended PTYPE */
149 150 151 152 153
        if (format == 7)
            put_bits(&s->pb,3,6); /* Custom Source Format */
        else
            put_bits(&s->pb, 3, format);
            
Fabrice Bellard's avatar
Fabrice Bellard committed
154
        put_bits(&s->pb,1,0); /* Custom PCF: off */
155 156
        s->umvplus = (s->pict_type == P_TYPE) && s->unrestricted_mv;
        put_bits(&s->pb, 1, s->umvplus); /* Unrestricted Motion Vector */
Fabrice Bellard's avatar
Fabrice Bellard committed
157 158
        put_bits(&s->pb,1,0); /* SAC: off */
        put_bits(&s->pb,1,0); /* Advanced Prediction Mode: off */
159
        put_bits(&s->pb,1,s->h263_aic); /* Advanced Intra Coding */
Fabrice Bellard's avatar
Fabrice Bellard committed
160 161 162 163 164 165 166 167 168 169 170 171 172
        put_bits(&s->pb,1,0); /* Deblocking Filter: off */
        put_bits(&s->pb,1,0); /* Slice Structured: off */
        put_bits(&s->pb,1,0); /* Reference Picture Selection: off */
        put_bits(&s->pb,1,0); /* Independent Segment Decoding: off */
        put_bits(&s->pb,1,0); /* Alternative Inter VLC: off */
        put_bits(&s->pb,1,0); /* Modified Quantization: off */
        put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
        put_bits(&s->pb,3,0); /* Reserved */
		
        put_bits(&s->pb, 3, s->pict_type == P_TYPE);
		
        put_bits(&s->pb,1,0); /* Reference Picture Resampling: off */
        put_bits(&s->pb,1,0); /* Reduced-Resolution Update: off */
173 174 175 176 177
        if (s->pict_type == I_TYPE)
            s->no_rounding = 0;
        else
            s->no_rounding ^= 1;
        put_bits(&s->pb,1,s->no_rounding); /* Rounding Type */
Fabrice Bellard's avatar
Fabrice Bellard committed
178 179 180 181 182 183
        put_bits(&s->pb,2,0); /* Reserved */
        put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
		
        /* This should be here if PLUSPTYPE */
        put_bits(&s->pb, 1, 0);	/* Continuous Presence Multipoint mode: off */
		
184 185
		if (format == 7) {
            /* Custom Picture Format (CPFMT) */
Fabrice Bellard's avatar
Fabrice Bellard committed
186
		
187 188 189
	    if (s->aspect_ratio_info)
            put_bits(&s->pb,4,s->aspect_ratio_info);
	    else
190 191 192 193 194 195
            put_bits(&s->pb,4,2); /* Aspect ratio: CIF 12:11 (4:3) picture */
            put_bits(&s->pb,9,(s->width >> 2) - 1);
            put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
            put_bits(&s->pb,9,(s->height >> 2));
        }
        
Fabrice Bellard's avatar
Fabrice Bellard committed
196
        /* Unlimited Unrestricted Motion Vectors Indicator (UUI) */
197
        if (s->umvplus)
Fabrice Bellard's avatar
Fabrice Bellard committed
198 199 200 201 202
            put_bits(&s->pb,1,1); /* Limited according tables of Annex D */
        put_bits(&s->pb, 5, s->qscale);
    }

    put_bits(&s->pb, 1, 0);	/* no PEI */
203 204 205 206 207 208 209 210

    if(s->h263_aic){
         s->y_dc_scale_table= 
         s->c_dc_scale_table= h263_aic_dc_scale_table;
    }else{
        s->y_dc_scale_table=
        s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
    }
Fabrice Bellard's avatar
Fabrice Bellard committed
211 212
}

213 214 215 216 217 218 219
int h263_encode_gob_header(MpegEncContext * s, int mb_line)
{
    int pdif=0;
    
    /* Check to see if we need to put a new GBSC */
    /* for RTP packetization                    */
    if (s->rtp_mode) {
220
        pdif = pbBufPtr(&s->pb) - s->ptr_lastgob;
221 222 223
        if (pdif >= s->rtp_payload_size) {
            /* Bad luck, packet must be cut before */
            align_put_bits(&s->pb);
224 225 226
            flush_put_bits(&s->pb);
            /* Call the RTP callback to send the last GOB */
            if (s->rtp_callback) {
227
                pdif = pbBufPtr(&s->pb) - s->ptr_lastgob;
228 229
                s->rtp_callback(s->ptr_lastgob, pdif, s->gob_number);
            }
230
            s->ptr_lastgob = pbBufPtr(&s->pb);
231
            put_bits(&s->pb, 17, 1); /* GBSC */
232
            s->gob_number = mb_line / s->gob_index;
233
            put_bits(&s->pb, 5, s->gob_number); /* GN */
234
            put_bits(&s->pb, 2, s->pict_type == I_TYPE); /* GFID */
235
            put_bits(&s->pb, 5, s->qscale); /* GQUANT */
236
            //fprintf(stderr,"\nGOB: %2d size: %d", s->gob_number - 1, pdif);
237 238 239 240
            return pdif;
       } else if (pdif + s->mb_line_avgsize >= s->rtp_payload_size) {
           /* Cut the packet before we can't */
           align_put_bits(&s->pb);
241 242 243
           flush_put_bits(&s->pb);
           /* Call the RTP callback to send the last GOB */
           if (s->rtp_callback) {
244
               pdif = pbBufPtr(&s->pb) - s->ptr_lastgob;
245 246
               s->rtp_callback(s->ptr_lastgob, pdif, s->gob_number);
           }
247
           s->ptr_lastgob = pbBufPtr(&s->pb);
248
           put_bits(&s->pb, 17, 1); /* GBSC */
249
           s->gob_number = mb_line / s->gob_index;
250
           put_bits(&s->pb, 5, s->gob_number); /* GN */
251
           put_bits(&s->pb, 2, s->pict_type == I_TYPE); /* GFID */
252
           put_bits(&s->pb, 5, s->qscale); /* GQUANT */
253
           //fprintf(stderr,"\nGOB: %2d size: %d", s->gob_number - 1, pdif);
254 255 256 257 258
           return pdif;
       }
   }
   return 0;
}
259 260 261 262 263 264 265 266 267

static inline int decide_ac_pred(MpegEncContext * s, DCTELEM block[6][64], int dir[6])
{
    int score0=0, score1=0;
    int i, n;

    for(n=0; n<6; n++){
        INT16 *ac_val, *ac_val1;

Michael Niedermayer's avatar
Michael Niedermayer committed
268
        ac_val = s->ac_val[0][0] + s->block_index[n] * 16;
269 270
        ac_val1= ac_val;
        if(dir[n]){
Michael Niedermayer's avatar
Michael Niedermayer committed
271
            ac_val-= s->block_wrap[n]*16;
272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297
            for(i=1; i<8; i++){
                const int level= block[n][block_permute_op(i   )];
                score0+= ABS(level);
                score1+= ABS(level - ac_val[i+8]);
                ac_val1[i  ]=    block[n][block_permute_op(i<<3)];
                ac_val1[i+8]= level;
            }
        }else{
            ac_val-= 16;
            for(i=1; i<8; i++){
                const int level= block[n][block_permute_op(i<<3)];
                score0+= ABS(level);
                score1+= ABS(level - ac_val[i]);
                ac_val1[i  ]= level;
                ac_val1[i+8]=    block[n][block_permute_op(i   )];
            }
        }
    }

    return score0 > score1 ? 1 : 0;    
}

void mpeg4_encode_mb(MpegEncContext * s,
		    DCTELEM block[6][64],
		    int motion_x, int motion_y)
{
298
    int cbpc, cbpy, i, pred_x, pred_y;
299
    int bits;
300 301 302 303
    PutBitContext * const pb2    = s->data_partitioning                         ? &s->pb2    : &s->pb;
    PutBitContext * const tex_pb = s->data_partitioning && s->pict_type!=B_TYPE ? &s->tex_pb : &s->pb;
    PutBitContext * const dc_pb  = s->data_partitioning && s->pict_type!=I_TYPE ? &s->pb2    : &s->pb;
    const int interleaved_stats= (s->flags&CODEC_FLAG_PASS1) && !s->data_partitioning ? 1 : 0;
304
    
305 306 307
    //    printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y);
    if (!s->mb_intra) {
        /* compute cbp */
308
        int cbp = 0;
309
        for (i = 0; i < 6; i++) {
310 311
            if (s->block_last_index[i] >= 0)
                cbp |= 1 << (5 - i);
312
        }
313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331

        if(s->pict_type==B_TYPE){
            static const int mb_type_table[8]= {-1, 2, 3, 1,-1,-1,-1, 0}; /* convert from mv_dir to type */
            int mb_type=  mb_type_table[s->mv_dir];
            
            if(s->mb_x==0){
                s->last_mv[0][0][0]= 
                s->last_mv[0][0][1]= 
                s->last_mv[1][0][0]= 
                s->last_mv[1][0][1]= 0;
            }

            /* nothing to do if this MB was skiped in the next P Frame */
            if(s->mbskip_table[s->mb_y * s->mb_width + s->mb_x]){
                s->skip_count++;
                s->mv[0][0][0]= 
                s->mv[0][0][1]= 
                s->mv[1][0][0]= 
                s->mv[1][0][1]= 0;
332
                s->mv_dir= MV_DIR_FORWARD; //doesnt matter
333 334 335 336 337 338
                return;
            }

            if ((cbp | motion_x | motion_y | mb_type) ==0) {
                /* direct MB with MV={0,0} */
                put_bits(&s->pb, 1, 1); /* mb not coded modb1=1 */
339 340 341 342 343

                if(interleaved_stats){
                    s->misc_bits++;
                    s->last_bits++;
                }
344 345 346 347 348 349 350 351 352 353 354
                s->skip_count++;
                return;
            }
            put_bits(&s->pb, 1, 0);	/* mb coded modb1=0 */
            put_bits(&s->pb, 1, cbp ? 0 : 1); /* modb2 */ //FIXME merge
            put_bits(&s->pb, mb_type+1, 1); // this table is so simple that we dont need it :)
            if(cbp) put_bits(&s->pb, 6, cbp);
            
            if(cbp && mb_type)
                put_bits(&s->pb, 1, 0); /* no q-scale change */

355 356 357 358 359
            if(interleaved_stats){
                bits= get_bit_count(&s->pb);
                s->misc_bits+= bits - s->last_bits;
                s->last_bits=bits;
            }
Michael Niedermayer's avatar
Michael Niedermayer committed
360

361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388
            switch(mb_type)
            {
            case 0: /* direct */
                h263_encode_motion(s, motion_x, 1);
                h263_encode_motion(s, motion_y, 1);                
                break;
            case 1: /* bidir */
                h263_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code);
                h263_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code);
                h263_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code);
                h263_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code);
                s->last_mv[0][0][0]= s->mv[0][0][0];
                s->last_mv[0][0][1]= s->mv[0][0][1];
                s->last_mv[1][0][0]= s->mv[1][0][0];
                s->last_mv[1][0][1]= s->mv[1][0][1];
                break;
            case 2: /* backward */
                h263_encode_motion(s, motion_x - s->last_mv[1][0][0], s->b_code);
                h263_encode_motion(s, motion_y - s->last_mv[1][0][1], s->b_code);
                s->last_mv[1][0][0]= motion_x;
                s->last_mv[1][0][1]= motion_y;
                break;
            case 3: /* forward */
                h263_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code);
                h263_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code);
                s->last_mv[0][0][0]= motion_x;
                s->last_mv[0][0][1]= motion_y;
                break;
389 390
            default:
                printf("unknown mb type\n");
391 392
                return;
            }
393 394 395 396 397 398

            if(interleaved_stats){
                bits= get_bit_count(&s->pb);
                s->mv_bits+= bits - s->last_bits;
                s->last_bits=bits;
            }
399

400 401
            /* encode each block */
            for (i = 0; i < 6; i++) {
402 403 404 405 406 407 408
                mpeg4_encode_block(s, block[i], i, 0, zigzag_direct, NULL, &s->pb);
            }

            if(interleaved_stats){
                bits= get_bit_count(&s->pb);
                s->p_tex_bits+= bits - s->last_bits;
                s->last_bits=bits;
409 410 411
            }
        }else{ /* s->pict_type==B_TYPE */
            if ((cbp | motion_x | motion_y) == 0 && s->mv_type==MV_TYPE_16X16) {
Michael Niedermayer's avatar
Michael Niedermayer committed
412 413 414 415
                /* check if the B frames can skip it too, as we must skip it if we skip here 
                   why didnt they just compress the skip-mb bits instead of reusing them ?! */
                if(s->max_b_frames>0){
                    int i;
416 417 418 419 420 421 422 423 424 425 426
                    int x,y, offset;
                    uint8_t *p_pic;

                    x= s->mb_x*16;
                    y= s->mb_y*16;
                    if(x+16 > s->width)  x= s->width-16;
                    if(y+16 > s->height) y= s->height-16;

                    offset= x + y*s->linesize;
                    p_pic= s->new_picture[0] + offset;
                    
Michael Niedermayer's avatar
Michael Niedermayer committed
427 428
                    s->mb_skiped=1;
                    for(i=0; i<s->max_b_frames; i++){
Michael Niedermayer's avatar
Michael Niedermayer committed
429 430 431 432 433 434 435
                        uint8_t *b_pic;
                        int diff;

                        if(s->coded_order[i+1].pict_type!=B_TYPE) break;

                        b_pic= s->coded_order[i+1].picture[0] + offset;
                        diff= pix_abs16x16(p_pic, b_pic, s->linesize);
436
                        if(diff>s->qscale*70){ //FIXME check that 70 is optimal
Michael Niedermayer's avatar
Michael Niedermayer committed
437 438 439 440 441 442 443 444 445 446
                            s->mb_skiped=0;
                            break;
                        }
                    }
                }else
                    s->mb_skiped=1; 

                if(s->mb_skiped==1){
                    /* skip macroblock */
                    put_bits(&s->pb, 1, 1);
447 448 449 450 451

                    if(interleaved_stats){
                        s->misc_bits++;
                        s->last_bits++;
                    }
Michael Niedermayer's avatar
Michael Niedermayer committed
452 453 454
                    s->skip_count++;
                    return;
                }
455
            }
456

457 458 459 460 461 462 463 464
            put_bits(&s->pb, 1, 0);	/* mb coded */
            if(s->mv_type==MV_TYPE_16X16){
                cbpc = cbp & 3;
                put_bits(&s->pb,
                        inter_MCBPC_bits[cbpc],
                        inter_MCBPC_code[cbpc]);
                cbpy = cbp >> 2;
                cbpy ^= 0xf;
465
                put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
466
                    
467 468 469 470 471
                if(interleaved_stats){
                    bits= get_bit_count(&s->pb);
                    s->misc_bits+= bits - s->last_bits;
                    s->last_bits=bits;
                }
472

473 474 475 476 477 478 479 480 481 482 483 484
                /* motion vectors: 16x16 mode */
                h263_pred_motion(s, 0, &pred_x, &pred_y);
            
                h263_encode_motion(s, motion_x - pred_x, s->f_code);
                h263_encode_motion(s, motion_y - pred_y, s->f_code);
            }else{
                cbpc = (cbp & 3)+16;
                put_bits(&s->pb,
                        inter_MCBPC_bits[cbpc],
                        inter_MCBPC_code[cbpc]);
                cbpy = cbp >> 2;
                cbpy ^= 0xf;
485
                put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
486

487 488 489 490 491
                if(interleaved_stats){
                    bits= get_bit_count(&s->pb);
                    s->misc_bits+= bits - s->last_bits;
                    s->last_bits=bits;
                }
492 493 494 495 496 497 498 499

                for(i=0; i<4; i++){
                    /* motion vectors: 8x8 mode*/
                    h263_pred_motion(s, i, &pred_x, &pred_y);

                    h263_encode_motion(s, s->motion_val[ s->block_index[i] ][0] - pred_x, s->f_code);
                    h263_encode_motion(s, s->motion_val[ s->block_index[i] ][1] - pred_y, s->f_code);
                }
Michael Niedermayer's avatar
Michael Niedermayer committed
500
            }
501 502 503 504 505 506

            if(interleaved_stats){ 
                bits= get_bit_count(&s->pb);
                s->mv_bits+= bits - s->last_bits;
                s->last_bits=bits;
            }
507

508 509
            /* encode each block */
            for (i = 0; i < 6; i++) {
510 511 512 513 514 515 516
                mpeg4_encode_block(s, block[i], i, 0, zigzag_direct, NULL, tex_pb);
            }

            if(interleaved_stats){
                bits= get_bit_count(&s->pb);
                s->p_tex_bits+= bits - s->last_bits;
                s->last_bits=bits;
517 518
            }
            s->p_count++;
519 520
        }
    } else {
521
        int cbp;
522 523 524 525 526 527 528 529 530
        int dc_diff[6];   //dc values with the dc prediction subtracted 
        int dir[6];  //prediction direction
        int zigzag_last_index[6];
        UINT8 *scan_table[6];

        for(i=0; i<6; i++){
            const int level= block[i][0];
            UINT16 *dc_ptr;

531
            dc_diff[i]= level - ff_mpeg4_pred_dc(s, i, &dc_ptr, &dir[i]);
532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578
            if (i < 4) {
                *dc_ptr = level * s->y_dc_scale;
            } else {
                *dc_ptr = level * s->c_dc_scale;
            }
        }

        s->ac_pred= decide_ac_pred(s, block, dir);

        if(s->ac_pred){
            for(i=0; i<6; i++){
                UINT8 *st;
                int last_index;

                mpeg4_inv_pred_ac(s, block[i], i, dir[i]);
                if (dir[i]==0) st = ff_alternate_vertical_scan; /* left */
                else           st = ff_alternate_horizontal_scan; /* top */

                for(last_index=63; last_index>=0; last_index--) //FIXME optimize
                    if(block[i][st[last_index]]) break;
                zigzag_last_index[i]= s->block_last_index[i];
                s->block_last_index[i]= last_index;
                scan_table[i]= st;
            }
        }else{
            for(i=0; i<6; i++)
                scan_table[i]= zigzag_direct;
        }

        /* compute cbp */
        cbp = 0;
        for (i = 0; i < 6; i++) {
            if (s->block_last_index[i] >= 1)
                cbp |= 1 << (5 - i);
        }

        cbpc = cbp & 3;
        if (s->pict_type == I_TYPE) {
            put_bits(&s->pb,
                intra_MCBPC_bits[cbpc],
                intra_MCBPC_code[cbpc]);
        } else {
            put_bits(&s->pb, 1, 0);	/* mb coded */
            put_bits(&s->pb,
                inter_MCBPC_bits[cbpc + 4],
                inter_MCBPC_code[cbpc + 4]);
        }
579
        put_bits(pb2, 1, s->ac_pred);
580
        cbpy = cbp >> 2;
581
        put_bits(pb2, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
582

583 584 585 586 587
        if(interleaved_stats){
            bits= get_bit_count(&s->pb);
            s->misc_bits+= bits - s->last_bits;
            s->last_bits=bits;
        }
588

589 590
        /* encode each block */
        for (i = 0; i < 6; i++) {
591
            mpeg4_encode_block(s, block[i], i, dc_diff[i], scan_table[i], dc_pb, tex_pb);
592 593
        }

594 595 596 597 598
        if(interleaved_stats){
            bits= get_bit_count(&s->pb);
            s->i_tex_bits+= bits - s->last_bits;
            s->last_bits=bits;
        }
599 600
        s->i_count++;

601 602 603 604 605 606
        /* restore ac coeffs & last_index stuff if we messed them up with the prediction */
        if(s->ac_pred){
            for(i=0; i<6; i++){
                int j;    
                INT16 *ac_val;

Michael Niedermayer's avatar
Michael Niedermayer committed
607
                ac_val = s->ac_val[0][0] + s->block_index[i] * 16;
608 609 610 611 612 613 614 615 616 617 618 619 620 621

                if(dir[i]){
                    for(j=1; j<8; j++) 
                        block[i][block_permute_op(j   )]= ac_val[j+8];
                }else{
                    for(j=1; j<8; j++) 
                        block[i][block_permute_op(j<<3)]= ac_val[j  ];
                }
                s->block_last_index[i]= zigzag_last_index[i];
            }
        }
    }
}

Fabrice Bellard's avatar
Fabrice Bellard committed
622 623 624 625 626
void h263_encode_mb(MpegEncContext * s,
		    DCTELEM block[6][64],
		    int motion_x, int motion_y)
{
    int cbpc, cbpy, i, cbp, pred_x, pred_y;
627 628 629 630 631
    INT16 pred_dc;
    INT16 rec_intradc[6];
    UINT16 *dc_ptr[6];
           
    //printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y);
632
    if (!s->mb_intra) {
633
        /* compute cbp */
634 635 636 637 638 639 640 641 642 643
        cbp = 0;
        for (i = 0; i < 6; i++) {
            if (s->block_last_index[i] >= 0)
                cbp |= 1 << (5 - i);
        }
        if ((cbp | motion_x | motion_y) == 0) {
            /* skip macroblock */
            put_bits(&s->pb, 1, 1);
            return;
        }
644
        put_bits(&s->pb, 1, 0);	/* mb coded */
645 646
        cbpc = cbp & 3;
        put_bits(&s->pb,
647 648
		    inter_MCBPC_bits[cbpc],
		    inter_MCBPC_code[cbpc]);
649 650 651 652
        cbpy = cbp >> 2;
        cbpy ^= 0xf;
        put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);

653
        /* motion vectors: 16x16 mode only now */
654
        h263_pred_motion(s, 0, &pred_x, &pred_y);
655
      
656 657 658 659 660 661 662 663
        if (!s->umvplus) {  
            h263_encode_motion(s, motion_x - pred_x, s->f_code);
            h263_encode_motion(s, motion_y - pred_y, s->f_code);
        }
        else {
            h263p_encode_umotion(s, motion_x - pred_x);
            h263p_encode_umotion(s, motion_y - pred_y);
            if (((motion_x - pred_x) == 1) && ((motion_y - pred_y) == 1))
664
                /* To prevent Start Code emulation */
665 666
                put_bits(&s->pb,1,1);
        }
667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711
    } else {
        int li = s->h263_aic ? 0 : 1;
        
        cbp = 0;
        for(i=0; i<6; i++) {
            /* Predict DC */
            if (s->h263_aic && s->mb_intra) {
                INT16 level = block[i][0];
            
                pred_dc = h263_pred_dc(s, i, &dc_ptr[i]);
                level -= pred_dc;
                /* Quant */
                if (level < 0)
                    level = (level + (s->qscale >> 1))/(s->y_dc_scale);
                else
                    level = (level - (s->qscale >> 1))/(s->y_dc_scale);
                    
                /* AIC can change CBP */
                if (level == 0 && s->block_last_index[i] == 0)
                    s->block_last_index[i] = -1;
                else if (level < -127)
                    level = -127;
                else if (level > 127)
                    level = 127;
                
                block[i][0] = level;
                /* Reconstruction */ 
                rec_intradc[i] = (s->y_dc_scale*level) + pred_dc;
                /* Oddify */
                rec_intradc[i] |= 1;
                //if ((rec_intradc[i] % 2) == 0)
                //    rec_intradc[i]++;
                /* Clipping */
                if (rec_intradc[i] < 0)
                    rec_intradc[i] = 0;
                else if (rec_intradc[i] > 2047)
                    rec_intradc[i] = 2047;
                                
                /* Update AC/DC tables */
                *dc_ptr[i] = rec_intradc[i];
            }
            /* compute cbp */
            if (s->block_last_index[i] >= li)
                cbp |= 1 << (5 - i);
        }
Fabrice Bellard's avatar
Fabrice Bellard committed
712

713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729
        cbpc = cbp & 3;
        if (s->pict_type == I_TYPE) {
            put_bits(&s->pb,
                intra_MCBPC_bits[cbpc],
                intra_MCBPC_code[cbpc]);
        } else {
            put_bits(&s->pb, 1, 0);	/* mb coded */
            put_bits(&s->pb,
                inter_MCBPC_bits[cbpc + 4],
                inter_MCBPC_code[cbpc + 4]);
        }
        if (s->h263_aic) {
            /* XXX: currently, we do not try to use ac prediction */
            put_bits(&s->pb, 1, 0);	/* no AC prediction */
        }
        cbpy = cbp >> 2;
        put_bits(&s->pb, cbpy_tab[cbpy][1], cbpy_tab[cbpy][0]);
Fabrice Bellard's avatar
Fabrice Bellard committed
730 731
    }

732 733
    for(i=0; i<6; i++) {
        /* encode each block */
734
        h263_encode_block(s, block[i], i);
735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763
    
        /* Update INTRADC for decoding */
        if (s->h263_aic && s->mb_intra) {
            block[i][0] = rec_intradc[i];
            
        }
    }
}

static int h263_pred_dc(MpegEncContext * s, int n, UINT16 **dc_val_ptr)
{
    int x, y, wrap, a, c, pred_dc, scale;
    INT16 *dc_val, *ac_val;

    /* find prediction */
    if (n < 4) {
        x = 2 * s->mb_x + 1 + (n & 1);
        y = 2 * s->mb_y + 1 + ((n & 2) >> 1);
        wrap = s->mb_width * 2 + 2;
        dc_val = s->dc_val[0];
        ac_val = s->ac_val[0][0];
        scale = s->y_dc_scale;
    } else {
        x = s->mb_x + 1;
        y = s->mb_y + 1;
        wrap = s->mb_width + 2;
        dc_val = s->dc_val[n - 4 + 1];
        ac_val = s->ac_val[n - 4 + 1][0];
        scale = s->c_dc_scale;
Fabrice Bellard's avatar
Fabrice Bellard committed
764
    }
765 766 767 768 769 770 771
    /* B C
     * A X 
     */
    a = dc_val[(x - 1) + (y) * wrap];
    c = dc_val[(x) + (y - 1) * wrap];
    
    /* No prediction outside GOB boundary */
772
    if (s->first_slice_line && ((n < 2) || (n > 3)))
773 774 775 776 777 778 779 780 781 782 783 784 785 786
        c = 1024;
    pred_dc = 1024;
    /* just DC prediction */
    if (a != 1024 && c != 1024)
        pred_dc = (a + c) >> 1;
    else if (a != 1024)
        pred_dc = a;
    else
        pred_dc = c;
    
    /* we assume pred is positive */
    //pred_dc = (pred_dc + (scale >> 1)) / scale;
    *dc_val_ptr = &dc_val[x + y * wrap];
    return pred_dc;
Fabrice Bellard's avatar
Fabrice Bellard committed
787 788
}

789

790
void h263_pred_acdc(MpegEncContext * s, INT16 *block, int n)
791
{
792 793
    int x, y, wrap, a, c, pred_dc, scale, i;
    INT16 *dc_val, *ac_val, *ac_val1;
794 795 796 797 798 799 800

    /* find prediction */
    if (n < 4) {
        x = 2 * s->mb_x + 1 + (n & 1);
        y = 2 * s->mb_y + 1 + ((n & 2) >> 1);
        wrap = s->mb_width * 2 + 2;
        dc_val = s->dc_val[0];
801
        ac_val = s->ac_val[0][0];
802 803 804 805 806 807
        scale = s->y_dc_scale;
    } else {
        x = s->mb_x + 1;
        y = s->mb_y + 1;
        wrap = s->mb_width + 2;
        dc_val = s->dc_val[n - 4 + 1];
808
        ac_val = s->ac_val[n - 4 + 1][0];
809 810
        scale = s->c_dc_scale;
    }
811 812 813 814
    
    ac_val += ((y) * wrap + (x)) * 16;
    ac_val1 = ac_val;
    
815 816 817 818 819 820
    /* B C
     * A X 
     */
    a = dc_val[(x - 1) + (y) * wrap];
    c = dc_val[(x) + (y - 1) * wrap];
    
821
    /* No prediction outside GOB boundary */
822
    if (s->first_slice_line && ((n < 2) || (n > 3)))
823
        c = 1024;
824
    pred_dc = 1024;
825 826 827
    if (s->ac_pred) {
        if (s->h263_aic_dir) {
            /* left prediction */
828 829 830 831 832 833
            if (a != 1024) {
                ac_val -= 16;
                for(i=1;i<8;i++) {
                    block[block_permute_op(i*8)] += ac_val[i];
                }
                pred_dc = a;
834 835 836
            }
        } else {
            /* top prediction */
837 838 839 840 841 842
            if (c != 1024) {
                ac_val -= 16 * wrap;
                for(i=1;i<8;i++) {
                    block[block_permute_op(i)] += ac_val[i + 8];
                }
                pred_dc = c;
843 844
            }
        }
845 846 847 848 849 850 851 852
    } else {
        /* just DC prediction */
        if (a != 1024 && c != 1024)
            pred_dc = (a + c) >> 1;
        else if (a != 1024)
            pred_dc = a;
        else
            pred_dc = c;
853
    }
854 855 856 857 858 859 860 861 862 863 864 865
    
    /* we assume pred is positive */
    block[0]=block[0]*scale + pred_dc;
    
    if (block[0] < 0)
        block[0] = 0;
    else if (!(block[0] & 1))
        block[0]++;
    
    /* Update AC/DC tables */
    dc_val[(x) + (y) * wrap] = block[0];
    
866 867 868 869 870 871 872 873
    /* left copy */
    for(i=1;i<8;i++)
        ac_val1[i] = block[block_permute_op(i * 8)];
    /* top copy */
    for(i=1;i<8;i++)
        ac_val1[8 + i] = block[block_permute_op(i)];
}

Fabrice Bellard's avatar
Fabrice Bellard committed
874 875 876
INT16 *h263_pred_motion(MpegEncContext * s, int block, 
                        int *px, int *py)
{
Michael Niedermayer's avatar
Michael Niedermayer committed
877
    int xy, wrap;
Fabrice Bellard's avatar
Fabrice Bellard committed
878
    INT16 *A, *B, *C, *mot_val;
879
    static const int off[4]= {2, 1, 1, -1};
Fabrice Bellard's avatar
Fabrice Bellard committed
880

Michael Niedermayer's avatar
Michael Niedermayer committed
881 882
    wrap = s->block_wrap[0];
    xy = s->block_index[block];
Fabrice Bellard's avatar
Fabrice Bellard committed
883

Zdenek Kabelac's avatar
Zdenek Kabelac committed
884
    mot_val = s->motion_val[xy];
Fabrice Bellard's avatar
Fabrice Bellard committed
885

886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924
    A = s->motion_val[xy - 1];
    /* special case for first (slice) line */
    if ((s->mb_y == 0 || s->first_slice_line) && block<3) {
        // we cant just change some MVs to simulate that as we need them for the B frames (and ME)
        // and if we ever support non rectangular objects than we need to do a few ifs here anyway :(
        if(block==0){ //most common case
            if(s->mb_x  == s->resync_mb_x){ //rare
                *px= *py = 0;
            }else if(s->mb_x + 1 == s->resync_mb_x){ //rare
                C = s->motion_val[xy + off[block] - wrap];
                if(s->mb_x==0){
                    *px = C[0];
                    *py = C[1];
                }else{
                    *px = mid_pred(A[0], 0, C[0]);
                    *py = mid_pred(A[1], 0, C[1]);
                }
            }else{
                *px = A[0];
                *py = A[1];
            }
        }else if(block==1){
            if(s->mb_x + 1 == s->resync_mb_x){ //rare
                C = s->motion_val[xy + off[block] - wrap];
                *px = mid_pred(A[0], 0, C[0]);
                *py = mid_pred(A[1], 0, C[1]);
            }else{
                *px = A[0];
                *py = A[1];
            }
        }else{ /* block==2*/
            B = s->motion_val[xy - wrap];
            C = s->motion_val[xy + off[block] - wrap];
            if(s->mb_x == s->resync_mb_x) //rare
                A[0]=A[1]=0;
    
            *px = mid_pred(A[0], B[0], C[0]);
            *py = mid_pred(A[1], B[1], C[1]);
        }
Fabrice Bellard's avatar
Fabrice Bellard committed
925
    } else {
926 927
        B = s->motion_val[xy - wrap];
        C = s->motion_val[xy + off[block] - wrap];
Fabrice Bellard's avatar
Fabrice Bellard committed
928 929 930 931 932 933
        *px = mid_pred(A[0], B[0], C[0]);
        *py = mid_pred(A[1], B[1], C[1]);
    }
    return mot_val;
}

934
static void h263_encode_motion(MpegEncContext * s, int val, int f_code)
Fabrice Bellard's avatar
Fabrice Bellard committed
935 936 937 938 939 940 941 942
{
    int range, l, m, bit_size, sign, code, bits;

    if (val == 0) {
        /* zero vector */
        code = 0;
        put_bits(&s->pb, mvtab[code][1], mvtab[code][0]);
    } else {
943
        bit_size = f_code - 1;
Fabrice Bellard's avatar
Fabrice Bellard committed
944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959
        range = 1 << bit_size;
        /* modulo encoding */
        l = range * 32;
        m = 2 * l;
        if (val < -l) {
            val += m;
        } else if (val >= l) {
            val -= m;
        }

        if (val >= 0) {
            sign = 0;
        } else {
            val = -val;
            sign = 1;
        }
960 961 962
        val--;
        code = (val >> bit_size) + 1;
        bits = val & (range - 1);
Fabrice Bellard's avatar
Fabrice Bellard committed
963 964 965 966 967 968 969 970

        put_bits(&s->pb, mvtab[code][1] + 1, (mvtab[code][0] << 1) | sign); 
        if (bit_size > 0) {
            put_bits(&s->pb, bit_size, bits);
        }
    }
}

971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009
/* Encode MV differences on H.263+ with Unrestricted MV mode */
static void h263p_encode_umotion(MpegEncContext * s, int val)
{
    short sval = 0; 
    short i = 0;
    short n_bits = 0;
    short temp_val;
    int code = 0;
    int tcode;
    
    if ( val == 0)
        put_bits(&s->pb, 1, 1);
    else if (val == 1)
        put_bits(&s->pb, 3, 0);
    else if (val == -1)
        put_bits(&s->pb, 3, 2);
    else {
        
        sval = ((val < 0) ? (short)(-val):(short)val);
        temp_val = sval;
        
        while (temp_val != 0) {
            temp_val = temp_val >> 1;
            n_bits++;
        }
        
        i = n_bits - 1;
        while (i > 0) {
            tcode = (sval & (1 << (i-1))) >> (i-1);
            tcode = (tcode << 1) | 1;
            code = (code << 2) | tcode;
            i--;
        }
        code = ((code << 1) | (val < 0)) << 1;
        put_bits(&s->pb, (2*n_bits)+1, code);
        //printf("\nVal = %d\tCode = %d", sval, code);
    }
}

1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045
static void init_mv_penalty_and_fcode(MpegEncContext *s)
{
    int f_code;
    int mv;
    for(f_code=1; f_code<=MAX_FCODE; f_code++){
        for(mv=-MAX_MV; mv<=MAX_MV; mv++){
            int len;

            if(mv==0) len= mvtab[0][1];
            else{
                int val, bit_size, range, code;

                bit_size = s->f_code - 1;
                range = 1 << bit_size;

                val=mv;
                if (val < 0) 
                    val = -val;
                val--;
                code = (val >> bit_size) + 1;
                if(code<33){
                    len= mvtab[code][1] + 1 + bit_size;
                }else{
                    len= mvtab[32][1] + 2 + bit_size;
                }
            }

            mv_penalty[f_code][mv+MAX_MV]= len;
        }
    }

    for(f_code=MAX_FCODE; f_code>0; f_code--){
        for(mv=-(16<<f_code); mv<(16<<f_code); mv++){
            fcode_tab[mv+MAX_MV]= f_code;
        }
    }
1046 1047 1048 1049

    for(mv=0; mv<MAX_MV*2+1; mv++){
        umv_fcode_tab[mv]= 1;
    }
1050 1051
}

Falk Hüffner's avatar
Falk Hüffner committed
1052
static void init_uni_dc_tab(void)
1053 1054 1055
{
    int level, uni_code, uni_len;

1056
    for(level=-256; level<256; level++){
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103
        int size, v, l;
        /* find number of bits */
        size = 0;
        v = abs(level);
        while (v) {
            v >>= 1;
	    size++;
        }

        if (level < 0)
            l= (-level) ^ ((1 << size) - 1);
        else
            l= level;

        /* luminance */
        uni_code= DCtab_lum[size][0];
        uni_len = DCtab_lum[size][1];

        if (size > 0) {
            uni_code<<=size; uni_code|=l;
            uni_len+=size;
            if (size > 8){
                uni_code<<=1; uni_code|=1;
                uni_len++;
            }
        }
        uni_DCtab_lum[level+256][0]= uni_code;
        uni_DCtab_lum[level+256][1]= uni_len;

        /* chrominance */
        uni_code= DCtab_chrom[size][0];
        uni_len = DCtab_chrom[size][1];
        
        if (size > 0) {
            uni_code<<=size; uni_code|=l;
            uni_len+=size;
            if (size > 8){
                uni_code<<=1; uni_code|=1;
                uni_len++;
            }
        }
        uni_DCtab_chrom[level+256][0]= uni_code;
        uni_DCtab_chrom[level+256][1]= uni_len;

    }
}

1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139