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1
/*
2
 * RV30/40 decoder common data
3
 * Copyright (c) 2007 Mike Melanson, Konstantin Shishkov
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * 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 FFmpeg; 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
/**
23
 * @file
24
 * RV30/40 decoder common data
25
 */
26

    
27
#include "avcodec.h"
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#include "dsputil.h"
29
#include "mpegvideo.h"
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#include "golomb.h"
31
#include "mathops.h"
32
#include "rectangle.h"
33

    
34
#include "rv34vlc.h"
35
#include "rv34data.h"
36
#include "rv34.h"
37

    
38
//#define DEBUG
39

    
40
static inline void ZERO8x2(void* dst, int stride)
41
{
42
    fill_rectangle(dst,                 1, 2, stride, 0, 4);
43
    fill_rectangle(((uint8_t*)(dst))+4, 1, 2, stride, 0, 4);
44
}
45

    
46
/** translation of RV30/40 macroblock types to lavc ones */
47
static const int rv34_mb_type_to_lavc[12] = {
48
    MB_TYPE_INTRA,
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    MB_TYPE_INTRA16x16              | MB_TYPE_SEPARATE_DC,
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    MB_TYPE_16x16   | MB_TYPE_L0,
51
    MB_TYPE_8x8     | MB_TYPE_L0,
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    MB_TYPE_16x16   | MB_TYPE_L0,
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    MB_TYPE_16x16   | MB_TYPE_L1,
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    MB_TYPE_SKIP,
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    MB_TYPE_DIRECT2 | MB_TYPE_16x16,
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    MB_TYPE_16x8    | MB_TYPE_L0,
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    MB_TYPE_8x16    | MB_TYPE_L0,
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    MB_TYPE_16x16   | MB_TYPE_L0L1,
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    MB_TYPE_16x16   | MB_TYPE_L0    | MB_TYPE_SEPARATE_DC
60
};
61

    
62

    
63
static RV34VLC intra_vlcs[NUM_INTRA_TABLES], inter_vlcs[NUM_INTER_TABLES];
64

    
65
/**
66
 * @defgroup vlc RV30/40 VLC generating functions
67
 * @{
68
 */
69

    
70
static const int table_offs[] = {
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      0,   1818,   3622,   4144,   4698,   5234,   5804,   5868,   5900,   5932,
72
   5996,   6252,   6316,   6348,   6380,   7674,   8944,  10274,  11668,  12250,
73
  14060,  15846,  16372,  16962,  17512,  18148,  18180,  18212,  18244,  18308,
74
  18564,  18628,  18660,  18692,  20036,  21314,  22648,  23968,  24614,  26384,
75
  28190,  28736,  29366,  29938,  30608,  30640,  30672,  30704,  30768,  31024,
76
  31088,  31120,  31184,  32570,  33898,  35236,  36644,  37286,  39020,  40802,
77
  41368,  42052,  42692,  43348,  43380,  43412,  43444,  43476,  43604,  43668,
78
  43700,  43732,  45100,  46430,  47778,  49160,  49802,  51550,  53340,  53972,
79
  54648,  55348,  55994,  56122,  56154,  56186,  56218,  56346,  56410,  56442,
80
  56474,  57878,  59290,  60636,  62036,  62682,  64460,  64524,  64588,  64716,
81
  64844,  66076,  67466,  67978,  68542,  69064,  69648,  70296,  72010,  72074,
82
  72138,  72202,  72330,  73572,  74936,  75454,  76030,  76566,  77176,  77822,
83
  79582,  79646,  79678,  79742,  79870,  81180,  82536,  83064,  83672,  84242,
84
  84934,  85576,  87384,  87448,  87480,  87544,  87672,  88982,  90340,  90902,
85
  91598,  92182,  92846,  93488,  95246,  95278,  95310,  95374,  95502,  96878,
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  98266,  98848,  99542, 100234, 100884, 101524, 103320, 103352, 103384, 103416,
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 103480, 104874, 106222, 106910, 107584, 108258, 108902, 109544, 111366, 111398,
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 111430, 111462, 111494, 112878, 114320, 114988, 115660, 116310, 116950, 117592
89
};
90

    
91
static VLC_TYPE table_data[117592][2];
92

    
93
/**
94
 * Generate VLC from codeword lengths.
95
 * @param bits   codeword lengths (zeroes are accepted)
96
 * @param size   length of input data
97
 * @param vlc    output VLC
98
 * @param insyms symbols for input codes (NULL for default ones)
99
 * @param num    VLC table number (for static initialization)
100
 */
101
static void rv34_gen_vlc(const uint8_t *bits, int size, VLC *vlc, const uint8_t *insyms,
102
                         const int num)
103
{
104
    int i;
105
    int counts[17] = {0}, codes[17];
106
    uint16_t cw[MAX_VLC_SIZE], syms[MAX_VLC_SIZE];
107
    uint8_t bits2[MAX_VLC_SIZE];
108
    int maxbits = 0, realsize = 0;
109

    
110
    for(i = 0; i < size; i++){
111
        if(bits[i]){
112
            bits2[realsize] = bits[i];
113
            syms[realsize] = insyms ? insyms[i] : i;
114
            realsize++;
115
            maxbits = FFMAX(maxbits, bits[i]);
116
            counts[bits[i]]++;
117
        }
118
    }
119

    
120
    codes[0] = 0;
121
    for(i = 0; i < 16; i++)
122
        codes[i+1] = (codes[i] + counts[i]) << 1;
123
    for(i = 0; i < realsize; i++)
124
        cw[i] = codes[bits2[i]]++;
125

    
126
    vlc->table = &table_data[table_offs[num]];
127
    vlc->table_allocated = table_offs[num + 1] - table_offs[num];
128
    init_vlc_sparse(vlc, FFMIN(maxbits, 9), realsize,
129
                    bits2, 1, 1,
130
                    cw,    2, 2,
131
                    syms,  2, 2, INIT_VLC_USE_NEW_STATIC);
132
}
133

    
134
/**
135
 * Initialize all tables.
136
 */
137
static av_cold void rv34_init_tables(void)
138
{
139
    int i, j, k;
140

    
141
    for(i = 0; i < NUM_INTRA_TABLES; i++){
142
        for(j = 0; j < 2; j++){
143
            rv34_gen_vlc(rv34_table_intra_cbppat   [i][j], CBPPAT_VLC_SIZE,   &intra_vlcs[i].cbppattern[j],     NULL, 19*i + 0 + j);
144
            rv34_gen_vlc(rv34_table_intra_secondpat[i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].second_pattern[j], NULL, 19*i + 2 + j);
145
            rv34_gen_vlc(rv34_table_intra_thirdpat [i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].third_pattern[j],  NULL, 19*i + 4 + j);
146
            for(k = 0; k < 4; k++){
147
                rv34_gen_vlc(rv34_table_intra_cbp[i][j+k*2],  CBP_VLC_SIZE,   &intra_vlcs[i].cbp[j][k],         rv34_cbp_code, 19*i + 6 + j*4 + k);
148
            }
149
        }
150
        for(j = 0; j < 4; j++){
151
            rv34_gen_vlc(rv34_table_intra_firstpat[i][j], FIRSTBLK_VLC_SIZE, &intra_vlcs[i].first_pattern[j], NULL, 19*i + 14 + j);
152
        }
153
        rv34_gen_vlc(rv34_intra_coeff[i], COEFF_VLC_SIZE, &intra_vlcs[i].coefficient, NULL, 19*i + 18);
154
    }
155

    
156
    for(i = 0; i < NUM_INTER_TABLES; i++){
157
        rv34_gen_vlc(rv34_inter_cbppat[i], CBPPAT_VLC_SIZE, &inter_vlcs[i].cbppattern[0], NULL, i*12 + 95);
158
        for(j = 0; j < 4; j++){
159
            rv34_gen_vlc(rv34_inter_cbp[i][j], CBP_VLC_SIZE, &inter_vlcs[i].cbp[0][j], rv34_cbp_code, i*12 + 96 + j);
160
        }
161
        for(j = 0; j < 2; j++){
162
            rv34_gen_vlc(rv34_table_inter_firstpat [i][j], FIRSTBLK_VLC_SIZE, &inter_vlcs[i].first_pattern[j],  NULL, i*12 + 100 + j);
163
            rv34_gen_vlc(rv34_table_inter_secondpat[i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].second_pattern[j], NULL, i*12 + 102 + j);
164
            rv34_gen_vlc(rv34_table_inter_thirdpat [i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].third_pattern[j],  NULL, i*12 + 104 + j);
165
        }
166
        rv34_gen_vlc(rv34_inter_coeff[i], COEFF_VLC_SIZE, &inter_vlcs[i].coefficient, NULL, i*12 + 106);
167
    }
168
}
169

    
170
/** @} */ // vlc group
171

    
172

    
173
/**
174
 * @defgroup transform RV30/40 inverse transform functions
175
 * @{
176
 */
177

    
178
static av_always_inline void rv34_row_transform(int temp[16], DCTELEM *block)
179
{
180
    int i;
181

    
182
    for(i=0; i<4; i++){
183
        const int z0= 13*(block[i+8*0] +    block[i+8*2]);
184
        const int z1= 13*(block[i+8*0] -    block[i+8*2]);
185
        const int z2=  7* block[i+8*1] - 17*block[i+8*3];
186
        const int z3= 17* block[i+8*1] +  7*block[i+8*3];
187

    
188
        temp[4*i+0]= z0+z3;
189
        temp[4*i+1]= z1+z2;
190
        temp[4*i+2]= z1-z2;
191
        temp[4*i+3]= z0-z3;
192
    }
193
}
194

    
195
/**
196
 * Real Video 3.0/4.0 inverse transform
197
 * Code is almost the same as in SVQ3, only scaling is different.
198
 */
199
static void rv34_inv_transform(DCTELEM *block){
200
    int temp[16];
201
    int i;
202

    
203
    rv34_row_transform(temp, block);
204

    
205
    for(i=0; i<4; i++){
206
        const int z0= 13*(temp[4*0+i] +    temp[4*2+i]) + 0x200;
207
        const int z1= 13*(temp[4*0+i] -    temp[4*2+i]) + 0x200;
208
        const int z2=  7* temp[4*1+i] - 17*temp[4*3+i];
209
        const int z3= 17* temp[4*1+i] +  7*temp[4*3+i];
210

    
211
        block[i*8+0]= (z0 + z3)>>10;
212
        block[i*8+1]= (z1 + z2)>>10;
213
        block[i*8+2]= (z1 - z2)>>10;
214
        block[i*8+3]= (z0 - z3)>>10;
215
    }
216

    
217
}
218

    
219
/**
220
 * RealVideo 3.0/4.0 inverse transform for DC block
221
 *
222
 * Code is almost the same as rv34_inv_transform()
223
 * but final coefficients are multiplied by 1.5 and have no rounding.
224
 */
225
static void rv34_inv_transform_noround(DCTELEM *block){
226
    int temp[16];
227
    int i;
228

    
229
    rv34_row_transform(temp, block);
230

    
231
    for(i=0; i<4; i++){
232
        const int z0= 13*(temp[4*0+i] +    temp[4*2+i]);
233
        const int z1= 13*(temp[4*0+i] -    temp[4*2+i]);
234
        const int z2=  7* temp[4*1+i] - 17*temp[4*3+i];
235
        const int z3= 17* temp[4*1+i] +  7*temp[4*3+i];
236

    
237
        block[i*8+0]= ((z0 + z3)*3)>>11;
238
        block[i*8+1]= ((z1 + z2)*3)>>11;
239
        block[i*8+2]= ((z1 - z2)*3)>>11;
240
        block[i*8+3]= ((z0 - z3)*3)>>11;
241
    }
242

    
243
}
244

    
245
/** @} */ // transform
246

    
247

    
248
/**
249
 * @defgroup block RV30/40 4x4 block decoding functions
250
 * @{
251
 */
252

    
253
/**
254
 * Decode coded block pattern.
255
 */
256
static int rv34_decode_cbp(GetBitContext *gb, RV34VLC *vlc, int table)
257
{
258
    int pattern, code, cbp=0;
259
    int ones;
260
    static const int cbp_masks[3] = {0x100000, 0x010000, 0x110000};
261
    static const int shifts[4] = { 0, 2, 8, 10 };
262
    const int *curshift = shifts;
263
    int i, t, mask;
264

    
265
    code = get_vlc2(gb, vlc->cbppattern[table].table, 9, 2);
266
    pattern = code & 0xF;
267
    code >>= 4;
268

    
269
    ones = rv34_count_ones[pattern];
270

    
271
    for(mask = 8; mask; mask >>= 1, curshift++){
272
        if(pattern & mask)
273
            cbp |= get_vlc2(gb, vlc->cbp[table][ones].table, vlc->cbp[table][ones].bits, 1) << curshift[0];
274
    }
275

    
276
    for(i = 0; i < 4; i++){
277
        t = modulo_three_table[code][i];
278
        if(t == 1)
279
            cbp |= cbp_masks[get_bits1(gb)] << i;
280
        if(t == 2)
281
            cbp |= cbp_masks[2] << i;
282
    }
283
    return cbp;
284
}
285

    
286
/**
287
 * Get one coefficient value from the bistream and store it.
288
 */
289
static inline void decode_coeff(DCTELEM *dst, int coef, int esc, GetBitContext *gb, VLC* vlc)
290
{
291
    if(coef){
292
        if(coef == esc){
293
            coef = get_vlc2(gb, vlc->table, 9, 2);
294
            if(coef > 23){
295
                coef -= 23;
296
                coef = 22 + ((1 << coef) | get_bits(gb, coef));
297
            }
298
            coef += esc;
299
        }
300
        if(get_bits1(gb))
301
            coef = -coef;
302
        *dst = coef;
303
    }
304
}
305

    
306
/**
307
 * Decode 2x2 subblock of coefficients.
308
 */
309
static inline void decode_subblock(DCTELEM *dst, int code, const int is_block2, GetBitContext *gb, VLC *vlc)
310
{
311
    int coeffs[4];
312

    
313
    coeffs[0] = modulo_three_table[code][0];
314
    coeffs[1] = modulo_three_table[code][1];
315
    coeffs[2] = modulo_three_table[code][2];
316
    coeffs[3] = modulo_three_table[code][3];
317
    decode_coeff(dst  , coeffs[0], 3, gb, vlc);
318
    if(is_block2){
319
        decode_coeff(dst+8, coeffs[1], 2, gb, vlc);
320
        decode_coeff(dst+1, coeffs[2], 2, gb, vlc);
321
    }else{
322
        decode_coeff(dst+1, coeffs[1], 2, gb, vlc);
323
        decode_coeff(dst+8, coeffs[2], 2, gb, vlc);
324
    }
325
    decode_coeff(dst+9, coeffs[3], 2, gb, vlc);
326
}
327

    
328
/**
329
 * Decode coefficients for 4x4 block.
330
 *
331
 * This is done by filling 2x2 subblocks with decoded coefficients
332
 * in this order (the same for subblocks and subblock coefficients):
333
 *  o--o
334
 *    /
335
 *   /
336
 *  o--o
337
 */
338

    
339
static inline void rv34_decode_block(DCTELEM *dst, GetBitContext *gb, RV34VLC *rvlc, int fc, int sc)
340
{
341
    int code, pattern;
342

    
343
    code = get_vlc2(gb, rvlc->first_pattern[fc].table, 9, 2);
344

    
345
    pattern = code & 0x7;
346

    
347
    code >>= 3;
348
    decode_subblock(dst, code, 0, gb, &rvlc->coefficient);
349

    
350
    if(pattern & 4){
351
        code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);
352
        decode_subblock(dst + 2, code, 0, gb, &rvlc->coefficient);
353
    }
354
    if(pattern & 2){ // Looks like coefficients 1 and 2 are swapped for this block
355
        code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);
356
        decode_subblock(dst + 8*2, code, 1, gb, &rvlc->coefficient);
357
    }
358
    if(pattern & 1){
359
        code = get_vlc2(gb, rvlc->third_pattern[sc].table, 9, 2);
360
        decode_subblock(dst + 8*2+2, code, 0, gb, &rvlc->coefficient);
361
    }
362

    
363
}
364

    
365
/**
366
 * Dequantize ordinary 4x4 block.
367
 * @todo optimize
368
 */
369
static inline void rv34_dequant4x4(DCTELEM *block, int Qdc, int Q)
370
{
371
    int i, j;
372

    
373
    block[0] = (block[0] * Qdc + 8) >> 4;
374
    for(i = 0; i < 4; i++)
375
        for(j = !i; j < 4; j++)
376
            block[j + i*8] = (block[j + i*8] * Q + 8) >> 4;
377
}
378

    
379
/**
380
 * Dequantize 4x4 block of DC values for 16x16 macroblock.
381
 * @todo optimize
382
 */
383
static inline void rv34_dequant4x4_16x16(DCTELEM *block, int Qdc, int Q)
384
{
385
    int i;
386

    
387
    for(i = 0; i < 3; i++)
388
         block[rv34_dezigzag[i]] = (block[rv34_dezigzag[i]] * Qdc + 8) >> 4;
389
    for(; i < 16; i++)
390
         block[rv34_dezigzag[i]] = (block[rv34_dezigzag[i]] * Q + 8) >> 4;
391
}
392
/** @} */ //block functions
393

    
394

    
395
/**
396
 * @defgroup rv3040_bitstream RV30/40 bitstream parsing
397
 * @{
398
 */
399

    
400
/**
401
 * Decode starting slice position.
402
 * @todo Maybe replace with ff_h263_decode_mba() ?
403
 */
404
int ff_rv34_get_start_offset(GetBitContext *gb, int mb_size)
405
{
406
    int i;
407
    for(i = 0; i < 5; i++)
408
        if(rv34_mb_max_sizes[i] >= mb_size - 1)
409
            break;
410
    return rv34_mb_bits_sizes[i];
411
}
412

    
413
/**
414
 * Select VLC set for decoding from current quantizer, modifier and frame type.
415
 */
416
static inline RV34VLC* choose_vlc_set(int quant, int mod, int type)
417
{
418
    if(mod == 2 && quant < 19) quant += 10;
419
    else if(mod && quant < 26) quant += 5;
420
    return type ? &inter_vlcs[rv34_quant_to_vlc_set[1][av_clip(quant, 0, 30)]]
421
                : &intra_vlcs[rv34_quant_to_vlc_set[0][av_clip(quant, 0, 30)]];
422
}
423

    
424
/**
425
 * Decode quantizer difference and return modified quantizer.
426
 */
427
static inline int rv34_decode_dquant(GetBitContext *gb, int quant)
428
{
429
    if(get_bits1(gb))
430
        return rv34_dquant_tab[get_bits1(gb)][quant];
431
    else
432
        return get_bits(gb, 5);
433
}
434

    
435
/** @} */ //bitstream functions
436

    
437
/**
438
 * @defgroup mv motion vector related code (prediction, reconstruction, motion compensation)
439
 * @{
440
 */
441

    
442
/** macroblock partition width in 8x8 blocks */
443
static const uint8_t part_sizes_w[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 2 };
444

    
445
/** macroblock partition height in 8x8 blocks */
446
static const uint8_t part_sizes_h[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2 };
447

    
448
/** availability index for subblocks */
449
static const uint8_t avail_indexes[4] = { 6, 7, 10, 11 };
450

    
451
/**
452
 * motion vector prediction
453
 *
454
 * Motion prediction performed for the block by using median prediction of
455
 * motion vectors from the left, top and right top blocks but in corner cases
456
 * some other vectors may be used instead.
457
 */
458
static void rv34_pred_mv(RV34DecContext *r, int block_type, int subblock_no, int dmv_no)
459
{
460
    MpegEncContext *s = &r->s;
461
    int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
462
    int A[2] = {0}, B[2], C[2];
463
    int i, j;
464
    int mx, my;
465
    int avail_index = avail_indexes[subblock_no];
466
    int c_off = part_sizes_w[block_type];
467

    
468
    mv_pos += (subblock_no & 1) + (subblock_no >> 1)*s->b8_stride;
469
    if(subblock_no == 3)
470
        c_off = -1;
471

    
472
    if(r->avail_cache[avail_index - 1]){
473
        A[0] = s->current_picture_ptr->motion_val[0][mv_pos-1][0];
474
        A[1] = s->current_picture_ptr->motion_val[0][mv_pos-1][1];
475
    }
476
    if(r->avail_cache[avail_index - 4]){
477
        B[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][0];
478
        B[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][1];
479
    }else{
480
        B[0] = A[0];
481
        B[1] = A[1];
482
    }
483
    if(!r->avail_cache[avail_index - 4 + c_off]){
484
        if(r->avail_cache[avail_index - 4] && (r->avail_cache[avail_index - 1] || r->rv30)){
485
            C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][0];
486
            C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][1];
487
        }else{
488
            C[0] = A[0];
489
            C[1] = A[1];
490
        }
491
    }else{
492
        C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+c_off][0];
493
        C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+c_off][1];
494
    }
495
    mx = mid_pred(A[0], B[0], C[0]);
496
    my = mid_pred(A[1], B[1], C[1]);
497
    mx += r->dmv[dmv_no][0];
498
    my += r->dmv[dmv_no][1];
499
    for(j = 0; j < part_sizes_h[block_type]; j++){
500
        for(i = 0; i < part_sizes_w[block_type]; i++){
501
            s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][0] = mx;
502
            s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][1] = my;
503
        }
504
    }
505
}
506

    
507
#define GET_PTS_DIFF(a, b) ((a - b + 8192) & 0x1FFF)
508

    
509
/**
510
 * Calculate motion vector component that should be added for direct blocks.
511
 */
512
static int calc_add_mv(RV34DecContext *r, int dir, int val)
513
{
514
    int refdist = GET_PTS_DIFF(r->next_pts, r->last_pts);
515
    int dist = dir ? -GET_PTS_DIFF(r->next_pts, r->cur_pts) : GET_PTS_DIFF(r->cur_pts, r->last_pts);
516
    int mul;
517

    
518
    if(!refdist) return 0;
519
    mul = (dist << 14) / refdist;
520
    return (val * mul + 0x2000) >> 14;
521
}
522

    
523
/**
524
 * Predict motion vector for B-frame macroblock.
525
 */
526
static inline void rv34_pred_b_vector(int A[2], int B[2], int C[2],
527
                                      int A_avail, int B_avail, int C_avail,
528
                                      int *mx, int *my)
529
{
530
    if(A_avail + B_avail + C_avail != 3){
531
        *mx = A[0] + B[0] + C[0];
532
        *my = A[1] + B[1] + C[1];
533
        if(A_avail + B_avail + C_avail == 2){
534
            *mx /= 2;
535
            *my /= 2;
536
        }
537
    }else{
538
        *mx = mid_pred(A[0], B[0], C[0]);
539
        *my = mid_pred(A[1], B[1], C[1]);
540
    }
541
}
542

    
543
/**
544
 * motion vector prediction for B-frames
545
 */
546
static void rv34_pred_mv_b(RV34DecContext *r, int block_type, int dir)
547
{
548
    MpegEncContext *s = &r->s;
549
    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
550
    int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
551
    int A[2], B[2], C[2];
552
    int has_A = 0, has_B = 0, has_C = 0;
553
    int mx, my;
554
    int i, j;
555
    Picture *cur_pic = s->current_picture_ptr;
556
    const int mask = dir ? MB_TYPE_L1 : MB_TYPE_L0;
557
    int type = cur_pic->mb_type[mb_pos];
558

    
559
    memset(A, 0, sizeof(A));
560
    memset(B, 0, sizeof(B));
561
    memset(C, 0, sizeof(C));
562
    if((r->avail_cache[6-1] & type) & mask){
563
        A[0] = cur_pic->motion_val[dir][mv_pos - 1][0];
564
        A[1] = cur_pic->motion_val[dir][mv_pos - 1][1];
565
        has_A = 1;
566
    }
567
    if((r->avail_cache[6-4] & type) & mask){
568
        B[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][0];
569
        B[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][1];
570
        has_B = 1;
571
    }
572
    if(r->avail_cache[6-4] && (r->avail_cache[6-2] & type) & mask){
573
        C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][0];
574
        C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][1];
575
        has_C = 1;
576
    }else if((s->mb_x+1) == s->mb_width && (r->avail_cache[6-5] & type) & mask){
577
        C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride - 1][0];
578
        C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride - 1][1];
579
        has_C = 1;
580
    }
581

    
582
    rv34_pred_b_vector(A, B, C, has_A, has_B, has_C, &mx, &my);
583

    
584
    mx += r->dmv[dir][0];
585
    my += r->dmv[dir][1];
586

    
587
    for(j = 0; j < 2; j++){
588
        for(i = 0; i < 2; i++){
589
            cur_pic->motion_val[dir][mv_pos + i + j*s->b8_stride][0] = mx;
590
            cur_pic->motion_val[dir][mv_pos + i + j*s->b8_stride][1] = my;
591
        }
592
    }
593
    if(block_type == RV34_MB_B_BACKWARD || block_type == RV34_MB_B_FORWARD){
594
        ZERO8x2(cur_pic->motion_val[!dir][mv_pos], s->b8_stride);
595
    }
596
}
597

    
598
/**
599
 * motion vector prediction - RV3 version
600
 */
601
static void rv34_pred_mv_rv3(RV34DecContext *r, int block_type, int dir)
602
{
603
    MpegEncContext *s = &r->s;
604
    int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
605
    int A[2] = {0}, B[2], C[2];
606
    int i, j, k;
607
    int mx, my;
608
    int avail_index = avail_indexes[0];
609

    
610
    if(r->avail_cache[avail_index - 1]){
611
        A[0] = s->current_picture_ptr->motion_val[0][mv_pos-1][0];
612
        A[1] = s->current_picture_ptr->motion_val[0][mv_pos-1][1];
613
    }
614
    if(r->avail_cache[avail_index - 4]){
615
        B[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][0];
616
        B[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][1];
617
    }else{
618
        B[0] = A[0];
619
        B[1] = A[1];
620
    }
621
    if(!r->avail_cache[avail_index - 4 + 2]){
622
        if(r->avail_cache[avail_index - 4] && (r->avail_cache[avail_index - 1])){
623
            C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][0];
624
            C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][1];
625
        }else{
626
            C[0] = A[0];
627
            C[1] = A[1];
628
        }
629
    }else{
630
        C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+2][0];
631
        C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+2][1];
632
    }
633
    mx = mid_pred(A[0], B[0], C[0]);
634
    my = mid_pred(A[1], B[1], C[1]);
635
    mx += r->dmv[0][0];
636
    my += r->dmv[0][1];
637
    for(j = 0; j < 2; j++){
638
        for(i = 0; i < 2; i++){
639
            for(k = 0; k < 2; k++){
640
                s->current_picture_ptr->motion_val[k][mv_pos + i + j*s->b8_stride][0] = mx;
641
                s->current_picture_ptr->motion_val[k][mv_pos + i + j*s->b8_stride][1] = my;
642
            }
643
        }
644
    }
645
}
646

    
647
static const int chroma_coeffs[3] = { 0, 3, 5 };
648

    
649
/**
650
 * generic motion compensation function
651
 *
652
 * @param r decoder context
653
 * @param block_type type of the current block
654
 * @param xoff horizontal offset from the start of the current block
655
 * @param yoff vertical offset from the start of the current block
656
 * @param mv_off offset to the motion vector information
657
 * @param width width of the current partition in 8x8 blocks
658
 * @param height height of the current partition in 8x8 blocks
659
 * @param dir motion compensation direction (i.e. from the last or the next reference frame)
660
 * @param thirdpel motion vectors are specified in 1/3 of pixel
661
 * @param qpel_mc a set of functions used to perform luma motion compensation
662
 * @param chroma_mc a set of functions used to perform chroma motion compensation
663
 */
664
static inline void rv34_mc(RV34DecContext *r, const int block_type,
665
                          const int xoff, const int yoff, int mv_off,
666
                          const int width, const int height, int dir,
667
                          const int thirdpel,
668
                          qpel_mc_func (*qpel_mc)[16],
669
                          h264_chroma_mc_func (*chroma_mc))
670
{
671
    MpegEncContext *s = &r->s;
672
    uint8_t *Y, *U, *V, *srcY, *srcU, *srcV;
673
    int dxy, mx, my, umx, umy, lx, ly, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;
674
    int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride + mv_off;
675
    int is16x16 = 1;
676

    
677
    if(thirdpel){
678
        int chroma_mx, chroma_my;
679
        mx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + (3 << 24)) / 3 - (1 << 24);
680
        my = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + (3 << 24)) / 3 - (1 << 24);
681
        lx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + (3 << 24)) % 3;
682
        ly = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + (3 << 24)) % 3;
683
        chroma_mx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + 1) >> 1;
684
        chroma_my = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + 1) >> 1;
685
        umx = (chroma_mx + (3 << 24)) / 3 - (1 << 24);
686
        umy = (chroma_my + (3 << 24)) / 3 - (1 << 24);
687
        uvmx = chroma_coeffs[(chroma_mx + (3 << 24)) % 3];
688
        uvmy = chroma_coeffs[(chroma_my + (3 << 24)) % 3];
689
    }else{
690
        int cx, cy;
691
        mx = s->current_picture_ptr->motion_val[dir][mv_pos][0] >> 2;
692
        my = s->current_picture_ptr->motion_val[dir][mv_pos][1] >> 2;
693
        lx = s->current_picture_ptr->motion_val[dir][mv_pos][0] & 3;
694
        ly = s->current_picture_ptr->motion_val[dir][mv_pos][1] & 3;
695
        cx = s->current_picture_ptr->motion_val[dir][mv_pos][0] / 2;
696
        cy = s->current_picture_ptr->motion_val[dir][mv_pos][1] / 2;
697
        umx = cx >> 2;
698
        umy = cy >> 2;
699
        uvmx = (cx & 3) << 1;
700
        uvmy = (cy & 3) << 1;
701
        //due to some flaw RV40 uses the same MC compensation routine for H2V2 and H3V3
702
        if(uvmx == 6 && uvmy == 6)
703
            uvmx = uvmy = 4;
704
    }
705
    dxy = ly*4 + lx;
706
    srcY = dir ? s->next_picture_ptr->data[0] : s->last_picture_ptr->data[0];
707
    srcU = dir ? s->next_picture_ptr->data[1] : s->last_picture_ptr->data[1];
708
    srcV = dir ? s->next_picture_ptr->data[2] : s->last_picture_ptr->data[2];
709
    src_x = s->mb_x * 16 + xoff + mx;
710
    src_y = s->mb_y * 16 + yoff + my;
711
    uvsrc_x = s->mb_x * 8 + (xoff >> 1) + umx;
712
    uvsrc_y = s->mb_y * 8 + (yoff >> 1) + umy;
713
    srcY += src_y * s->linesize + src_x;
714
    srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
715
    srcV += uvsrc_y * s->uvlinesize + uvsrc_x;
716
    if(   (unsigned)(src_x - !!lx*2) > s->h_edge_pos - !!lx*2 - (width <<3) - 4
717
       || (unsigned)(src_y - !!ly*2) > s->v_edge_pos - !!ly*2 - (height<<3) - 4){
718
        uint8_t *uvbuf= s->edge_emu_buffer + 22 * s->linesize;
719

    
720
        srcY -= 2 + 2*s->linesize;
721
        s->dsp.emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, (width<<3)+6, (height<<3)+6,
722
                            src_x - 2, src_y - 2, s->h_edge_pos, s->v_edge_pos);
723
        srcY = s->edge_emu_buffer + 2 + 2*s->linesize;
724
        s->dsp.emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, (width<<2)+1, (height<<2)+1,
725
                            uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);
726
        s->dsp.emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, (width<<2)+1, (height<<2)+1,
727
                            uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);
728
        srcU = uvbuf;
729
        srcV = uvbuf + 16;
730
    }
731
    Y = s->dest[0] + xoff      + yoff     *s->linesize;
732
    U = s->dest[1] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
733
    V = s->dest[2] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
734

    
735
    if(block_type == RV34_MB_P_16x8){
736
        qpel_mc[1][dxy](Y, srcY, s->linesize);
737
        Y    += 8;
738
        srcY += 8;
739
    }else if(block_type == RV34_MB_P_8x16){
740
        qpel_mc[1][dxy](Y, srcY, s->linesize);
741
        Y    += 8 * s->linesize;
742
        srcY += 8 * s->linesize;
743
    }
744
    is16x16 = (block_type != RV34_MB_P_8x8) && (block_type != RV34_MB_P_16x8) && (block_type != RV34_MB_P_8x16);
745
    qpel_mc[!is16x16][dxy](Y, srcY, s->linesize);
746
    chroma_mc[2-width]   (U, srcU, s->uvlinesize, height*4, uvmx, uvmy);
747
    chroma_mc[2-width]   (V, srcV, s->uvlinesize, height*4, uvmx, uvmy);
748
}
749

    
750
static void rv34_mc_1mv(RV34DecContext *r, const int block_type,
751
                        const int xoff, const int yoff, int mv_off,
752
                        const int width, const int height, int dir)
753
{
754
    rv34_mc(r, block_type, xoff, yoff, mv_off, width, height, dir, r->rv30,
755
            r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab
756
                    : r->s.dsp.put_rv40_qpel_pixels_tab,
757
            r->rv30 ? r->s.dsp.put_h264_chroma_pixels_tab
758
                    : r->s.dsp.put_rv40_chroma_pixels_tab);
759
}
760

    
761
static void rv34_mc_2mv(RV34DecContext *r, const int block_type)
762
{
763
    rv34_mc(r, block_type, 0, 0, 0, 2, 2, 0, r->rv30,
764
            r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab
765
                    : r->s.dsp.put_rv40_qpel_pixels_tab,
766
            r->rv30 ? r->s.dsp.put_h264_chroma_pixels_tab
767
                    : r->s.dsp.put_rv40_chroma_pixels_tab);
768
    rv34_mc(r, block_type, 0, 0, 0, 2, 2, 1, r->rv30,
769
            r->rv30 ? r->s.dsp.avg_rv30_tpel_pixels_tab
770
                    : r->s.dsp.avg_rv40_qpel_pixels_tab,
771
            r->rv30 ? r->s.dsp.avg_h264_chroma_pixels_tab
772
                    : r->s.dsp.avg_rv40_chroma_pixels_tab);
773
}
774

    
775
static void rv34_mc_2mv_skip(RV34DecContext *r)
776
{
777
    int i, j;
778
    for(j = 0; j < 2; j++)
779
        for(i = 0; i < 2; i++){
780
             rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 0, r->rv30,
781
                    r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab
782
                            : r->s.dsp.put_rv40_qpel_pixels_tab,
783
                    r->rv30 ? r->s.dsp.put_h264_chroma_pixels_tab
784
                            : r->s.dsp.put_rv40_chroma_pixels_tab);
785
             rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 1, r->rv30,
786
                    r->rv30 ? r->s.dsp.avg_rv30_tpel_pixels_tab
787
                            : r->s.dsp.avg_rv40_qpel_pixels_tab,
788
                    r->rv30 ? r->s.dsp.avg_h264_chroma_pixels_tab
789
                            : r->s.dsp.avg_rv40_chroma_pixels_tab);
790
        }
791
}
792

    
793
/** number of motion vectors in each macroblock type */
794
static const int num_mvs[RV34_MB_TYPES] = { 0, 0, 1, 4, 1, 1, 0, 0, 2, 2, 2, 1 };
795

    
796
/**
797
 * Decode motion vector differences
798
 * and perform motion vector reconstruction and motion compensation.
799
 */
800
static int rv34_decode_mv(RV34DecContext *r, int block_type)
801
{
802
    MpegEncContext *s = &r->s;
803
    GetBitContext *gb = &s->gb;
804
    int i, j, k, l;
805
    int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
806
    int next_bt;
807

    
808
    memset(r->dmv, 0, sizeof(r->dmv));
809
    for(i = 0; i < num_mvs[block_type]; i++){
810
        r->dmv[i][0] = svq3_get_se_golomb(gb);
811
        r->dmv[i][1] = svq3_get_se_golomb(gb);
812
    }
813
    switch(block_type){
814
    case RV34_MB_TYPE_INTRA:
815
    case RV34_MB_TYPE_INTRA16x16:
816
        ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
817
        return 0;
818
    case RV34_MB_SKIP:
819
        if(s->pict_type == FF_P_TYPE){
820
            ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
821
            rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);
822
            break;
823
        }
824
    case RV34_MB_B_DIRECT:
825
        //surprisingly, it uses motion scheme from next reference frame
826
        next_bt = s->next_picture_ptr->mb_type[s->mb_x + s->mb_y * s->mb_stride];
827
        if(IS_INTRA(next_bt) || IS_SKIP(next_bt)){
828
            ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
829
            ZERO8x2(s->current_picture_ptr->motion_val[1][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
830
        }else
831
            for(j = 0; j < 2; j++)
832
                for(i = 0; i < 2; i++)
833
                    for(k = 0; k < 2; k++)
834
                        for(l = 0; l < 2; l++)
835
                            s->current_picture_ptr->motion_val[l][mv_pos + i + j*s->b8_stride][k] = calc_add_mv(r, l, s->next_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][k]);
836
        if(!(IS_16X8(next_bt) || IS_8X16(next_bt) || IS_8X8(next_bt))) //we can use whole macroblock MC
837
            rv34_mc_2mv(r, block_type);
838
        else
839
            rv34_mc_2mv_skip(r);
840
        ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
841
        break;
842
    case RV34_MB_P_16x16:
843
    case RV34_MB_P_MIX16x16:
844
        rv34_pred_mv(r, block_type, 0, 0);
845
        rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);
846
        break;
847
    case RV34_MB_B_FORWARD:
848
    case RV34_MB_B_BACKWARD:
849
        r->dmv[1][0] = r->dmv[0][0];
850
        r->dmv[1][1] = r->dmv[0][1];
851
        if(r->rv30)
852
            rv34_pred_mv_rv3(r, block_type, block_type == RV34_MB_B_BACKWARD);
853
        else
854
            rv34_pred_mv_b  (r, block_type, block_type == RV34_MB_B_BACKWARD);
855
        rv34_mc_1mv     (r, block_type, 0, 0, 0, 2, 2, block_type == RV34_MB_B_BACKWARD);
856
        break;
857
    case RV34_MB_P_16x8:
858
    case RV34_MB_P_8x16:
859
        rv34_pred_mv(r, block_type, 0, 0);
860
        rv34_pred_mv(r, block_type, 1 + (block_type == RV34_MB_P_16x8), 1);
861
        if(block_type == RV34_MB_P_16x8){
862
            rv34_mc_1mv(r, block_type, 0, 0, 0,            2, 1, 0);
863
            rv34_mc_1mv(r, block_type, 0, 8, s->b8_stride, 2, 1, 0);
864
        }
865
        if(block_type == RV34_MB_P_8x16){
866
            rv34_mc_1mv(r, block_type, 0, 0, 0, 1, 2, 0);
867
            rv34_mc_1mv(r, block_type, 8, 0, 1, 1, 2, 0);
868
        }
869
        break;
870
    case RV34_MB_B_BIDIR:
871
        rv34_pred_mv_b  (r, block_type, 0);
872
        rv34_pred_mv_b  (r, block_type, 1);
873
        rv34_mc_2mv     (r, block_type);
874
        break;
875
    case RV34_MB_P_8x8:
876
        for(i=0;i< 4;i++){
877
            rv34_pred_mv(r, block_type, i, i);
878
            rv34_mc_1mv (r, block_type, (i&1)<<3, (i&2)<<2, (i&1)+(i>>1)*s->b8_stride, 1, 1, 0);
879
        }
880
        break;
881
    }
882

    
883
    return 0;
884
}
885
/** @} */ // mv group
886

    
887
/**
888
 * @defgroup recons Macroblock reconstruction functions
889
 * @{
890
 */
891
/** mapping of RV30/40 intra prediction types to standard H.264 types */
892
static const int ittrans[9] = {
893
 DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,
894
 VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,
895
};
896

    
897
/** mapping of RV30/40 intra 16x16 prediction types to standard H.264 types */
898
static const int ittrans16[4] = {
899
 DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,
900
};
901

    
902
/**
903
 * Perform 4x4 intra prediction.
904
 */
905
static void rv34_pred_4x4_block(RV34DecContext *r, uint8_t *dst, int stride, int itype, int up, int left, int down, int right)
906
{
907
    uint8_t *prev = dst - stride + 4;
908
    uint32_t topleft;
909

    
910
    if(!up && !left)
911
        itype = DC_128_PRED;
912
    else if(!up){
913
        if(itype == VERT_PRED) itype = HOR_PRED;
914
        if(itype == DC_PRED)   itype = LEFT_DC_PRED;
915
    }else if(!left){
916
        if(itype == HOR_PRED)  itype = VERT_PRED;
917
        if(itype == DC_PRED)   itype = TOP_DC_PRED;
918
        if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;
919
    }
920
    if(!down){
921
        if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;
922
        if(itype == HOR_UP_PRED) itype = HOR_UP_PRED_RV40_NODOWN;
923
        if(itype == VERT_LEFT_PRED) itype = VERT_LEFT_PRED_RV40_NODOWN;
924
    }
925
    if(!right && up){
926
        topleft = dst[-stride + 3] * 0x01010101;
927
        prev = (uint8_t*)&topleft;
928
    }
929
    r->h.pred4x4[itype](dst, prev, stride);
930
}
931

    
932
/** add_pixels_clamped for 4x4 block */
933
static void rv34_add_4x4_block(uint8_t *dst, int stride, DCTELEM block[64], int off)
934
{
935
    int x, y;
936
    for(y = 0; y < 4; y++)
937
        for(x = 0; x < 4; x++)
938
            dst[x + y*stride] = av_clip_uint8(dst[x + y*stride] + block[off + x+y*8]);
939
}
940

    
941
static inline int adjust_pred16(int itype, int up, int left)
942
{
943
    if(!up && !left)
944
        itype = DC_128_PRED8x8;
945
    else if(!up){
946
        if(itype == PLANE_PRED8x8)itype = HOR_PRED8x8;
947
        if(itype == VERT_PRED8x8) itype = HOR_PRED8x8;
948
        if(itype == DC_PRED8x8)   itype = LEFT_DC_PRED8x8;
949
    }else if(!left){
950
        if(itype == PLANE_PRED8x8)itype = VERT_PRED8x8;
951
        if(itype == HOR_PRED8x8)  itype = VERT_PRED8x8;
952
        if(itype == DC_PRED8x8)   itype = TOP_DC_PRED8x8;
953
    }
954
    return itype;
955
}
956

    
957
static void rv34_output_macroblock(RV34DecContext *r, int8_t *intra_types, int cbp, int is16)
958
{
959
    MpegEncContext *s = &r->s;
960
    DSPContext *dsp = &s->dsp;
961
    int i, j;
962
    uint8_t *Y, *U, *V;
963
    int itype;
964
    int avail[6*8] = {0};
965
    int idx;
966

    
967
    // Set neighbour information.
968
    if(r->avail_cache[1])
969
        avail[0] = 1;
970
    if(r->avail_cache[2])
971
        avail[1] = avail[2] = 1;
972
    if(r->avail_cache[3])
973
        avail[3] = avail[4] = 1;
974
    if(r->avail_cache[4])
975
        avail[5] = 1;
976
    if(r->avail_cache[5])
977
        avail[8] = avail[16] = 1;
978
    if(r->avail_cache[9])
979
        avail[24] = avail[32] = 1;
980

    
981
    Y = s->dest[0];
982
    U = s->dest[1];
983
    V = s->dest[2];
984
    if(!is16){
985
        for(j = 0; j < 4; j++){
986
            idx = 9 + j*8;
987
            for(i = 0; i < 4; i++, cbp >>= 1, Y += 4, idx++){
988
                rv34_pred_4x4_block(r, Y, s->linesize, ittrans[intra_types[i]], avail[idx-8], avail[idx-1], avail[idx+7], avail[idx-7]);
989
                avail[idx] = 1;
990
                if(cbp & 1)
991
                    rv34_add_4x4_block(Y, s->linesize, s->block[(i>>1)+(j&2)], (i&1)*4+(j&1)*32);
992
            }
993
            Y += s->linesize * 4 - 4*4;
994
            intra_types += r->intra_types_stride;
995
        }
996
        intra_types -= r->intra_types_stride * 4;
997
        fill_rectangle(r->avail_cache + 6, 2, 2, 4, 0, 4);
998
        for(j = 0; j < 2; j++){
999
            idx = 6 + j*4;
1000
            for(i = 0; i < 2; i++, cbp >>= 1, idx++){
1001
                rv34_pred_4x4_block(r, U + i*4 + j*4*s->uvlinesize, s->uvlinesize, ittrans[intra_types[i*2+j*2*r->intra_types_stride]], r->avail_cache[idx-4], r->avail_cache[idx-1], !i && !j, r->avail_cache[idx-3]);
1002
                rv34_pred_4x4_block(r, V + i*4 + j*4*s->uvlinesize, s->uvlinesize, ittrans[intra_types[i*2+j*2*r->intra_types_stride]], r->avail_cache[idx-4], r->avail_cache[idx-1], !i && !j, r->avail_cache[idx-3]);
1003
                r->avail_cache[idx] = 1;
1004
                if(cbp & 0x01)
1005
                    rv34_add_4x4_block(U + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[4], i*4+j*32);
1006
                if(cbp & 0x10)
1007
                    rv34_add_4x4_block(V + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[5], i*4+j*32);
1008
            }
1009
        }
1010
    }else{
1011
        itype = ittrans16[intra_types[0]];
1012
        itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);
1013
        r->h.pred16x16[itype](Y, s->linesize);
1014
        dsp->add_pixels_clamped(s->block[0], Y,     s->linesize);
1015
        dsp->add_pixels_clamped(s->block[1], Y + 8, s->linesize);
1016
        Y += s->linesize * 8;
1017
        dsp->add_pixels_clamped(s->block[2], Y,     s->linesize);
1018
        dsp->add_pixels_clamped(s->block[3], Y + 8, s->linesize);
1019

    
1020
        itype = ittrans16[intra_types[0]];
1021
        if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;
1022
        itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);
1023
        r->h.pred8x8[itype](U, s->uvlinesize);
1024
        dsp->add_pixels_clamped(s->block[4], U, s->uvlinesize);
1025
        r->h.pred8x8[itype](V, s->uvlinesize);
1026
        dsp->add_pixels_clamped(s->block[5], V, s->uvlinesize);
1027
    }
1028
}
1029

    
1030
/** @} */ // recons group
1031

    
1032
/**
1033
 * @addtogroup bitstream
1034
 * Decode macroblock header and return CBP in case of success, -1 otherwise.
1035
 */
1036
static int rv34_decode_mb_header(RV34DecContext *r, int8_t *intra_types)
1037
{
1038
    MpegEncContext *s = &r->s;
1039
    GetBitContext *gb = &s->gb;
1040
    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1041
    int i, t;
1042

    
1043
    if(!r->si.type){
1044
        r->is16 = get_bits1(gb);
1045
        if(!r->is16 && !r->rv30){
1046
            if(!get_bits1(gb))
1047
                av_log(s->avctx, AV_LOG_ERROR, "Need DQUANT\n");
1048
        }
1049
        s->current_picture_ptr->mb_type[mb_pos] = r->is16 ? MB_TYPE_INTRA16x16 : MB_TYPE_INTRA;
1050
        r->block_type = r->is16 ? RV34_MB_TYPE_INTRA16x16 : RV34_MB_TYPE_INTRA;
1051
    }else{
1052
        r->block_type = r->decode_mb_info(r);
1053
        if(r->block_type == -1)
1054
            return -1;
1055
        s->current_picture_ptr->mb_type[mb_pos] = rv34_mb_type_to_lavc[r->block_type];
1056
        r->mb_type[mb_pos] = r->block_type;
1057
        if(r->block_type == RV34_MB_SKIP){
1058
            if(s->pict_type == FF_P_TYPE)
1059
                r->mb_type[mb_pos] = RV34_MB_P_16x16;
1060
            if(s->pict_type == FF_B_TYPE)
1061
                r->mb_type[mb_pos] = RV34_MB_B_DIRECT;
1062
        }
1063
        r->is16 = !!IS_INTRA16x16(s->current_picture_ptr->mb_type[mb_pos]);
1064
        rv34_decode_mv(r, r->block_type);
1065
        if(r->block_type == RV34_MB_SKIP){
1066
            fill_rectangle(intra_types, 4, 4, r->intra_types_stride, 0, sizeof(intra_types[0]));
1067
            return 0;
1068
        }
1069
        r->chroma_vlc = 1;
1070
        r->luma_vlc   = 0;
1071
    }
1072
    if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){
1073
        if(r->is16){
1074
            t = get_bits(gb, 2);
1075
            fill_rectangle(intra_types, 4, 4, r->intra_types_stride, t, sizeof(intra_types[0]));
1076
            r->luma_vlc   = 2;
1077
        }else{
1078
            if(r->decode_intra_types(r, gb, intra_types) < 0)
1079
                return -1;
1080
            r->luma_vlc   = 1;
1081
        }
1082
        r->chroma_vlc = 0;
1083
        r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
1084
    }else{
1085
        for(i = 0; i < 16; i++)
1086
            intra_types[(i & 3) + (i>>2) * r->intra_types_stride] = 0;
1087
        r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);
1088
        if(r->mb_type[mb_pos] == RV34_MB_P_MIX16x16){
1089
            r->is16 = 1;
1090
            r->chroma_vlc = 1;
1091
            r->luma_vlc   = 2;
1092
            r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
1093
        }
1094
    }
1095

    
1096
    return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);
1097
}
1098

    
1099
/**
1100
 * @addtogroup recons
1101
 * @{
1102
 */
1103
/**
1104
 * mask for retrieving all bits in coded block pattern
1105
 * corresponding to one 8x8 block
1106
 */
1107
#define LUMA_CBP_BLOCK_MASK 0x33
1108

    
1109
#define U_CBP_MASK 0x0F0000
1110
#define V_CBP_MASK 0xF00000
1111

    
1112

    
1113
static void rv34_apply_differences(RV34DecContext *r, int cbp)
1114
{
1115
    static const int shifts[4] = { 0, 2, 8, 10 };
1116
    MpegEncContext *s = &r->s;
1117
    int i;
1118

    
1119
    for(i = 0; i < 4; i++)
1120
        if((cbp & (LUMA_CBP_BLOCK_MASK << shifts[i])) || r->block_type == RV34_MB_P_MIX16x16)
1121
            s->dsp.add_pixels_clamped(s->block[i], s->dest[0] + (i & 1)*8 + (i&2)*4*s->linesize, s->linesize);
1122
    if(cbp & U_CBP_MASK)
1123
        s->dsp.add_pixels_clamped(s->block[4], s->dest[1], s->uvlinesize);
1124
    if(cbp & V_CBP_MASK)
1125
        s->dsp.add_pixels_clamped(s->block[5], s->dest[2], s->uvlinesize);
1126
}
1127

    
1128
static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)
1129
{
1130
    int d;
1131
    d = motion_val[0][0] - motion_val[-step][0];
1132
    if(d < -3 || d > 3)
1133
        return 1;
1134
    d = motion_val[0][1] - motion_val[-step][1];
1135
    if(d < -3 || d > 3)
1136
        return 1;
1137
    return 0;
1138
}
1139

    
1140
static int rv34_set_deblock_coef(RV34DecContext *r)
1141
{
1142
    MpegEncContext *s = &r->s;
1143
    int hmvmask = 0, vmvmask = 0, i, j;
1144
    int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
1145
    int16_t (*motion_val)[2] = &s->current_picture_ptr->motion_val[0][midx];
1146
    for(j = 0; j < 16; j += 8){
1147
        for(i = 0; i < 2; i++){
1148
            if(is_mv_diff_gt_3(motion_val + i, 1))
1149
                vmvmask |= 0x11 << (j + i*2);
1150
            if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))
1151
                hmvmask |= 0x03 << (j + i*2);
1152
        }
1153
        motion_val += s->b8_stride;
1154
    }
1155
    if(s->first_slice_line)
1156
        hmvmask &= ~0x000F;
1157
    if(!s->mb_x)
1158
        vmvmask &= ~0x1111;
1159
    if(r->rv30){ //RV30 marks both subblocks on the edge for filtering
1160
        vmvmask |= (vmvmask & 0x4444) >> 1;
1161
        hmvmask |= (hmvmask & 0x0F00) >> 4;
1162
        if(s->mb_x)
1163
            r->deblock_coefs[s->mb_x - 1 + s->mb_y*s->mb_stride] |= (vmvmask & 0x1111) << 3;
1164
        if(!s->first_slice_line)
1165
            r->deblock_coefs[s->mb_x + (s->mb_y - 1)*s->mb_stride] |= (hmvmask & 0xF) << 12;
1166
    }
1167
    return hmvmask | vmvmask;
1168
}
1169

    
1170
static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)
1171
{
1172
    MpegEncContext *s = &r->s;
1173
    GetBitContext *gb = &s->gb;
1174
    int cbp, cbp2;
1175
    int i, blknum, blkoff;
1176
    DCTELEM block16[64];
1177
    int luma_dc_quant;
1178
    int dist;
1179
    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1180

    
1181
    // Calculate which neighbours are available. Maybe it's worth optimizing too.
1182
    memset(r->avail_cache, 0, sizeof(r->avail_cache));
1183
    fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);
1184
    dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;
1185
    if(s->mb_x && dist)
1186
        r->avail_cache[5] =
1187
        r->avail_cache[9] = s->current_picture_ptr->mb_type[mb_pos - 1];
1188
    if(dist >= s->mb_width)
1189
        r->avail_cache[2] =
1190
        r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];
1191
    if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)
1192
        r->avail_cache[4] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];
1193
    if(s->mb_x && dist > s->mb_width)
1194
        r->avail_cache[1] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];
1195

    
1196
    s->qscale = r->si.quant;
1197
    cbp = cbp2 = rv34_decode_mb_header(r, intra_types);
1198
    r->cbp_luma  [mb_pos] = cbp;
1199
    r->cbp_chroma[mb_pos] = cbp >> 16;
1200
    if(s->pict_type == FF_I_TYPE)
1201
        r->deblock_coefs[mb_pos] = 0xFFFF;
1202
    else
1203
        r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r) | r->cbp_luma[mb_pos];
1204
    s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;
1205

    
1206
    if(cbp == -1)
1207
        return -1;
1208

    
1209
    luma_dc_quant = r->block_type == RV34_MB_P_MIX16x16 ? r->luma_dc_quant_p[s->qscale] : r->luma_dc_quant_i[s->qscale];
1210
    if(r->is16){
1211
        memset(block16, 0, sizeof(block16));
1212
        rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0);
1213
        rv34_dequant4x4_16x16(block16, rv34_qscale_tab[luma_dc_quant],rv34_qscale_tab[s->qscale]);
1214
        rv34_inv_transform_noround(block16);
1215
    }
1216

    
1217
    for(i = 0; i < 16; i++, cbp >>= 1){
1218
        if(!r->is16 && !(cbp & 1)) continue;
1219
        blknum = ((i & 2) >> 1) + ((i & 8) >> 2);
1220
        blkoff = ((i & 1) << 2) + ((i & 4) << 3);
1221
        if(cbp & 1)
1222
            rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->luma_vlc, 0);
1223
        rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[s->qscale],rv34_qscale_tab[s->qscale]);
1224
        if(r->is16) //FIXME: optimize
1225
            s->block[blknum][blkoff] = block16[(i & 3) | ((i & 0xC) << 1)];
1226
        rv34_inv_transform(s->block[blknum] + blkoff);
1227
    }
1228
    if(r->block_type == RV34_MB_P_MIX16x16)
1229
        r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);
1230
    for(; i < 24; i++, cbp >>= 1){
1231
        if(!(cbp & 1)) continue;
1232
        blknum = ((i & 4) >> 2) + 4;
1233
        blkoff = ((i & 1) << 2) + ((i & 2) << 4);
1234
        rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->chroma_vlc, 1);
1235
        rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]],rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]]);
1236
        rv34_inv_transform(s->block[blknum] + blkoff);
1237
    }
1238
    if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos]))
1239
        rv34_output_macroblock(r, intra_types, cbp2, r->is16);
1240
    else
1241
        rv34_apply_differences(r, cbp2);
1242

    
1243
    return 0;
1244
}
1245

    
1246
static int check_slice_end(RV34DecContext *r, MpegEncContext *s)
1247
{
1248
    int bits;
1249
    if(s->mb_y >= s->mb_height)
1250
        return 1;
1251
    if(!s->mb_num_left)
1252
        return 1;
1253
    if(r->s.mb_skip_run > 1)
1254
        return 0;
1255
    bits = r->bits - get_bits_count(&s->gb);
1256
    if(bits < 0 || (bits < 8 && !show_bits(&s->gb, bits)))
1257
        return 1;
1258
    return 0;
1259
}
1260

    
1261
static inline int slice_compare(SliceInfo *si1, SliceInfo *si2)
1262
{
1263
    return si1->type   != si2->type  ||
1264
           si1->start  >= si2->start ||
1265
           si1->width  != si2->width ||
1266
           si1->height != si2->height||
1267
           si1->pts    != si2->pts;
1268
}
1269

    
1270
static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int buf_size)
1271
{
1272
    MpegEncContext *s = &r->s;
1273
    GetBitContext *gb = &s->gb;
1274
    int mb_pos;
1275
    int res;
1276

    
1277
    init_get_bits(&r->s.gb, buf, buf_size*8);
1278
    res = r->parse_slice_header(r, gb, &r->si);
1279
    if(res < 0){
1280
        av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");
1281
        return -1;
1282
    }
1283

    
1284
    if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr==NULL) {
1285
        if(s->width != r->si.width || s->height != r->si.height){
1286
            av_log(s->avctx, AV_LOG_DEBUG, "Changing dimensions to %dx%d\n", r->si.width,r->si.height);
1287
            MPV_common_end(s);
1288
            s->width  = r->si.width;
1289
            s->height = r->si.height;
1290
            avcodec_set_dimensions(s->avctx, s->width, s->height);
1291
            if(MPV_common_init(s) < 0)
1292
                return -1;
1293
            r->intra_types_stride = s->mb_width*4 + 4;
1294
            r->intra_types_hist = av_realloc(r->intra_types_hist, r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));
1295
            r->intra_types = r->intra_types_hist + r->intra_types_stride * 4;
1296
            r->mb_type = av_realloc(r->mb_type, r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));
1297
            r->cbp_luma   = av_realloc(r->cbp_luma,   r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));
1298
            r->cbp_chroma = av_realloc(r->cbp_chroma, r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));
1299
            r->deblock_coefs = av_realloc(r->deblock_coefs, r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));
1300
        }
1301
        s->pict_type = r->si.type ? r->si.type : FF_I_TYPE;
1302
        if(MPV_frame_start(s, s->avctx) < 0)
1303
            return -1;
1304
        ff_er_frame_start(s);
1305
        r->cur_pts = r->si.pts;
1306
        if(s->pict_type != FF_B_TYPE){
1307
            r->last_pts = r->next_pts;
1308
            r->next_pts = r->cur_pts;
1309
        }
1310
        s->mb_x = s->mb_y = 0;
1311
    }
1312

    
1313
    r->si.end = end;
1314
    s->qscale = r->si.quant;
1315
    r->bits = buf_size*8;
1316
    s->mb_num_left = r->si.end - r->si.start;
1317
    r->s.mb_skip_run = 0;
1318

    
1319
    mb_pos = s->mb_x + s->mb_y * s->mb_width;
1320
    if(r->si.start != mb_pos){
1321
        av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);
1322
        s->mb_x = r->si.start % s->mb_width;
1323
        s->mb_y = r->si.start / s->mb_width;
1324
    }
1325
    memset(r->intra_types_hist, -1, r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));
1326
    s->first_slice_line = 1;
1327
    s->resync_mb_x= s->mb_x;
1328
    s->resync_mb_y= s->mb_y;
1329

    
1330
    ff_init_block_index(s);
1331
    while(!check_slice_end(r, s)) {
1332
        ff_update_block_index(s);
1333
        s->dsp.clear_blocks(s->block[0]);
1334

    
1335
        if(rv34_decode_macroblock(r, r->intra_types + s->mb_x * 4 + 4) < 0){
1336
            ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
1337
            return -1;
1338
        }
1339
        if (++s->mb_x == s->mb_width) {
1340
            s->mb_x = 0;
1341
            s->mb_y++;
1342
            ff_init_block_index(s);
1343

    
1344
            memmove(r->intra_types_hist, r->intra_types, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));
1345
            memset(r->intra_types, -1, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));
1346

    
1347
            if(r->loop_filter && s->mb_y >= 2)
1348
                r->loop_filter(r, s->mb_y - 2);
1349
        }
1350
        if(s->mb_x == s->resync_mb_x)
1351
            s->first_slice_line=0;
1352
        s->mb_num_left--;
1353
    }
1354
    ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
1355

    
1356
    return s->mb_y == s->mb_height;
1357
}
1358

    
1359
/** @} */ // recons group end
1360

    
1361
/**
1362
 * Initialize decoder.
1363
 */
1364
av_cold int ff_rv34_decode_init(AVCodecContext *avctx)
1365
{
1366
    RV34DecContext *r = avctx->priv_data;
1367
    MpegEncContext *s = &r->s;
1368

    
1369
    MPV_decode_defaults(s);
1370
    s->avctx= avctx;
1371
    s->out_format = FMT_H263;
1372
    s->codec_id= avctx->codec_id;
1373

    
1374
    s->width = avctx->width;
1375
    s->height = avctx->height;
1376

    
1377
    r->s.avctx = avctx;
1378
    avctx->flags |= CODEC_FLAG_EMU_EDGE;
1379
    r->s.flags |= CODEC_FLAG_EMU_EDGE;
1380
    avctx->pix_fmt = PIX_FMT_YUV420P;
1381
    avctx->has_b_frames = 1;
1382
    s->low_delay = 0;
1383

    
1384
    if (MPV_common_init(s) < 0)
1385
        return -1;
1386

    
1387
    ff_h264_pred_init(&r->h, CODEC_ID_RV40, 8);
1388

    
1389
    r->intra_types_stride = 4*s->mb_stride + 4;
1390
    r->intra_types_hist = av_malloc(r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));
1391
    r->intra_types = r->intra_types_hist + r->intra_types_stride * 4;
1392

    
1393
    r->mb_type = av_mallocz(r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));
1394

    
1395
    r->cbp_luma   = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));
1396
    r->cbp_chroma = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));
1397
    r->deblock_coefs = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->deblock_coefs));
1398

    
1399
    if(!intra_vlcs[0].cbppattern[0].bits)
1400
        rv34_init_tables();
1401

    
1402
    return 0;
1403
}
1404

    
1405
static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
1406
{
1407
    if(avctx->slice_count) return avctx->slice_offset[n];
1408
    else                   return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) :  AV_RB32(buf + n*8);
1409
}
1410

    
1411
int ff_rv34_decode_frame(AVCodecContext *avctx,
1412
                            void *data, int *data_size,
1413
                            AVPacket *avpkt)
1414
{
1415
    const uint8_t *buf = avpkt->data;
1416
    int buf_size = avpkt->size;
1417
    RV34DecContext *r = avctx->priv_data;
1418
    MpegEncContext *s = &r->s;
1419
    AVFrame *pict = data;
1420
    SliceInfo si;
1421
    int i;
1422
    int slice_count;
1423
    const uint8_t *slices_hdr = NULL;
1424
    int last = 0;
1425

    
1426
    /* no supplementary picture */
1427
    if (buf_size == 0) {
1428
        /* special case for last picture */
1429
        if (s->low_delay==0 && s->next_picture_ptr) {
1430
            *pict= *(AVFrame*)s->next_picture_ptr;
1431
            s->next_picture_ptr= NULL;
1432

    
1433
            *data_size = sizeof(AVFrame);
1434
        }
1435
        return 0;
1436
    }
1437

    
1438
    if(!avctx->slice_count){
1439
        slice_count = (*buf++) + 1;
1440
        slices_hdr = buf + 4;
1441
        buf += 8 * slice_count;
1442
    }else
1443
        slice_count = avctx->slice_count;
1444

    
1445
    //parse first slice header to check whether this frame can be decoded
1446
    if(get_slice_offset(avctx, slices_hdr, 0) > buf_size){
1447
        av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");
1448
        return -1;
1449
    }
1450
    init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), buf_size-get_slice_offset(avctx, slices_hdr, 0));
1451
    if(r->parse_slice_header(r, &r->s.gb, &si) < 0 || si.start){
1452
        av_log(avctx, AV_LOG_ERROR, "First slice header is incorrect\n");
1453
        return -1;
1454
    }
1455
    if((!s->last_picture_ptr || !s->last_picture_ptr->data[0]) && si.type == FF_B_TYPE)
1456
        return -1;
1457
#if FF_API_HURRY_UP
1458
    /* skip b frames if we are in a hurry */
1459
    if(avctx->hurry_up && si.type==FF_B_TYPE) return buf_size;
1460
#endif
1461
    if(   (avctx->skip_frame >= AVDISCARD_NONREF && si.type==FF_B_TYPE)
1462
       || (avctx->skip_frame >= AVDISCARD_NONKEY && si.type!=FF_I_TYPE)
1463
       ||  avctx->skip_frame >= AVDISCARD_ALL)
1464
        return buf_size;
1465
#if FF_API_HURRY_UP
1466
    /* skip everything if we are in a hurry>=5 */
1467
    if(avctx->hurry_up>=5)
1468
        return buf_size;
1469
#endif
1470

    
1471
    for(i=0; i<slice_count; i++){
1472
        int offset= get_slice_offset(avctx, slices_hdr, i);
1473
        int size;
1474
        if(i+1 == slice_count)
1475
            size= buf_size - offset;
1476
        else
1477
            size= get_slice_offset(avctx, slices_hdr, i+1) - offset;
1478

    
1479
        if(offset > buf_size){
1480
            av_log(avctx, AV_LOG_ERROR, "Slice offset is greater than frame size\n");
1481
            break;
1482
        }
1483

    
1484
        r->si.end = s->mb_width * s->mb_height;
1485
        if(i+1 < slice_count){
1486
            init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, i+1), (buf_size-get_slice_offset(avctx, slices_hdr, i+1))*8);
1487
            if(r->parse_slice_header(r, &r->s.gb, &si) < 0){
1488
                if(i+2 < slice_count)
1489
                    size = get_slice_offset(avctx, slices_hdr, i+2) - offset;
1490
                else
1491
                    size = buf_size - offset;
1492
            }else
1493
                r->si.end = si.start;
1494
        }
1495
        last = rv34_decode_slice(r, r->si.end, buf + offset, size);
1496
        s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;
1497
        if(last)
1498
            break;
1499
    }
1500

    
1501
    if(last){
1502
        if(r->loop_filter)
1503
            r->loop_filter(r, s->mb_height - 1);
1504
        ff_er_frame_end(s);
1505
        MPV_frame_end(s);
1506
        if (s->pict_type == FF_B_TYPE || s->low_delay) {
1507
            *pict= *(AVFrame*)s->current_picture_ptr;
1508
        } else if (s->last_picture_ptr != NULL) {
1509
            *pict= *(AVFrame*)s->last_picture_ptr;
1510
        }
1511

    
1512
        if(s->last_picture_ptr || s->low_delay){
1513
            *data_size = sizeof(AVFrame);
1514
            ff_print_debug_info(s, pict);
1515
        }
1516
        s->current_picture_ptr= NULL; //so we can detect if frame_end wasnt called (find some nicer solution...)
1517
    }
1518
    return buf_size;
1519
}
1520

    
1521
av_cold int ff_rv34_decode_end(AVCodecContext *avctx)
1522
{
1523
    RV34DecContext *r = avctx->priv_data;
1524

    
1525
    MPV_common_end(&r->s);
1526

    
1527
    av_freep(&r->intra_types_hist);
1528
    r->intra_types = NULL;
1529
    av_freep(&r->mb_type);
1530
    av_freep(&r->cbp_luma);
1531
    av_freep(&r->cbp_chroma);
1532
    av_freep(&r->deblock_coefs);
1533

    
1534
    return 0;
1535
}