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1
/*
2
 * RV30/40 decoder common data
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 * Copyright (c) 2007 Mike Melanson, Konstantin Shishkov
4
 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with 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
/**
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 * @file rv34.c
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 * RV30/40 decoder common data
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 */
26

    
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#include "golomb.h"
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#include "rectangle.h"
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#include "rv34vlc.h"
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#include "rv34data.h"
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#include "rv34.h"
36

    
37
//#define DEBUG
38

    
39
/** translation of RV30/40 macroblock types to lavc ones */
40
static const int rv34_mb_type_to_lavc[12] = {
41
    MB_TYPE_INTRA,
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    MB_TYPE_INTRA16x16,
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    MB_TYPE_16x16   | MB_TYPE_L0,
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    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
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};
54

    
55

    
56
static RV34VLC intra_vlcs[NUM_INTRA_TABLES], inter_vlcs[NUM_INTER_TABLES];
57

    
58
/**
59
 * @defgroup vlc RV30/40 VLC generating functions
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 * @{
61
 */
62

    
63
/**
64
 * Generate VLC from codeword lengths.
65
 * @param bits   codeword lengths (zeroes are accepted)
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 * @param size   length of input data
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 * @param insyms symbols for input codes (NULL for default ones)
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 */
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static void rv34_gen_vlc(const uint8_t *bits, int size, VLC *vlc, const uint8_t *insyms)
70
{
71
    int i;
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    int counts[17] = {0}, codes[17];
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    uint16_t cw[size], syms[size];
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    uint8_t bits2[size];
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    int maxbits = 0, realsize = 0;
76

    
77
    for(i = 0; i < size; i++){
78
        if(bits[i]){
79
            bits2[realsize] = bits[i];
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            syms[realsize] = insyms ? insyms[i] : i;
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            realsize++;
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            maxbits = FFMAX(maxbits, bits[i]);
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            counts[bits[i]]++;
84
        }
85
    }
86

    
87
    codes[0] = 0;
88
    for(i = 0; i < 16; i++)
89
        codes[i+1] = (codes[i] + counts[i]) << 1;
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    for(i = 0; i < realsize; i++)
91
        cw[i] = codes[bits2[i]]++;
92

    
93
    init_vlc_sparse(vlc, FFMIN(maxbits, 9), realsize,
94
                    bits2, 1, 1,
95
                    cw,    2, 2,
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                    syms,  2, 2, INIT_VLC_USE_STATIC);
97
}
98

    
99
/**
100
 * Initialize all tables.
101
 */
102
static void rv34_init_tables()
103
{
104
    int i, j, k;
105

    
106
    for(i = 0; i < NUM_INTRA_TABLES; i++){
107
        for(j = 0; j < 2; j++){
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            rv34_gen_vlc(rv34_table_intra_cbppat   [i][j], CBPPAT_VLC_SIZE,   &intra_vlcs[i].cbppattern[j],     NULL);
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            rv34_gen_vlc(rv34_table_intra_secondpat[i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].second_pattern[j], NULL);
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            rv34_gen_vlc(rv34_table_intra_thirdpat [i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].third_pattern[j],  NULL);
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            for(k = 0; k < 4; k++)
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                rv34_gen_vlc(rv34_table_intra_cbp[i][j+k*2],  CBP_VLC_SIZE,   &intra_vlcs[i].cbp[j][k],         rv34_cbp_code);
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        }
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        for(j = 0; j < 4; j++)
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            rv34_gen_vlc(rv34_table_intra_firstpat[i][j], FIRSTBLK_VLC_SIZE, &intra_vlcs[i].first_pattern[j], NULL);
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        rv34_gen_vlc(rv34_intra_coeff[i], COEFF_VLC_SIZE, &intra_vlcs[i].coefficient, NULL);
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    }
118

    
119
    for(i = 0; i < NUM_INTER_TABLES; i++){
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        rv34_gen_vlc(rv34_inter_cbppat[i], CBPPAT_VLC_SIZE, &inter_vlcs[i].cbppattern[0], NULL);
121
        for(j = 0; j < 4; j++)
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            rv34_gen_vlc(rv34_inter_cbp[i][j], CBP_VLC_SIZE, &inter_vlcs[i].cbp[0][j], rv34_cbp_code);
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        for(j = 0; j < 2; j++){
124
            rv34_gen_vlc(rv34_table_inter_firstpat [i][j], FIRSTBLK_VLC_SIZE, &inter_vlcs[i].first_pattern[j],  NULL);
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            rv34_gen_vlc(rv34_table_inter_secondpat[i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].second_pattern[j], NULL);
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            rv34_gen_vlc(rv34_table_inter_thirdpat [i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].third_pattern[j],  NULL);
127
        }
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        rv34_gen_vlc(rv34_inter_coeff[i], COEFF_VLC_SIZE, &inter_vlcs[i].coefficient, NULL);
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    }
130
}
131

    
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/** @} */ // vlc group
133

    
134

    
135
/**
136
 * @defgroup transform RV30/40 inverse transform functions
137
 * @{
138
 */
139

    
140
static av_always_inline void rv34_row_transform(int temp[16], DCTELEM *block)
141
{
142
    int i;
143

    
144
    for(i=0; i<4; i++){
145
        const int z0= 13*(block[i+8*0] +    block[i+8*2]);
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        const int z1= 13*(block[i+8*0] -    block[i+8*2]);
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        const int z2=  7* block[i+8*1] - 17*block[i+8*3];
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        const int z3= 17* block[i+8*1] +  7*block[i+8*3];
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        temp[4*i+0]= z0+z3;
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        temp[4*i+1]= z1+z2;
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        temp[4*i+2]= z1-z2;
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        temp[4*i+3]= z0-z3;
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    }
155
}
156

    
157
/**
158
 * Real Video 3.0/4.0 inverse transform
159
 * Code is almost the same as in SVQ3, only scaling is different.
160
 */
161
static void rv34_inv_transform(DCTELEM *block){
162
    int temp[16];
163
    int i;
164

    
165
    rv34_row_transform(temp, block);
166

    
167
    for(i=0; i<4; i++){
168
        const int z0= 13*(temp[4*0+i] +    temp[4*2+i]) + 0x200;
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        const int z1= 13*(temp[4*0+i] -    temp[4*2+i]) + 0x200;
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        const int z2=  7* temp[4*1+i] - 17*temp[4*3+i];
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        const int z3= 17* temp[4*1+i] +  7*temp[4*3+i];
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173
        block[i*8+0]= (z0 + z3)>>10;
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        block[i*8+1]= (z1 + z2)>>10;
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        block[i*8+2]= (z1 - z2)>>10;
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        block[i*8+3]= (z0 - z3)>>10;
177
    }
178

    
179
}
180

    
181
/**
182
 * RealVideo 3.0/4.0 inverse transform for DC block
183
 *
184
 * Code is almost the same as rv34_inv_transform()
185
 * but final coefficients are multiplied by 1.5 and have no rounding.
186
 */
187
static void rv34_inv_transform_noround(DCTELEM *block){
188
    int temp[16];
189
    int i;
190

    
191
    rv34_row_transform(temp, block);
192

    
193
    for(i=0; i<4; i++){
194
        const int z0= 13*(temp[4*0+i] +    temp[4*2+i]);
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        const int z1= 13*(temp[4*0+i] -    temp[4*2+i]);
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        const int z2=  7* temp[4*1+i] - 17*temp[4*3+i];
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        const int z3= 17* temp[4*1+i] +  7*temp[4*3+i];
198

    
199
        block[i*8+0]= ((z0 + z3)*3)>>11;
200
        block[i*8+1]= ((z1 + z2)*3)>>11;
201
        block[i*8+2]= ((z1 - z2)*3)>>11;
202
        block[i*8+3]= ((z0 - z3)*3)>>11;
203
    }
204

    
205
}
206

    
207
/** @} */ // transform
208

    
209

    
210
/**
211
 * @defgroup block RV30/40 4x4 block decoding functions
212
 * @{
213
 */
214

    
215
/**
216
 * Decode coded block pattern.
217
 */
218
static int rv34_decode_cbp(GetBitContext *gb, RV34VLC *vlc, int table)
219
{
220
    int pattern, code, cbp=0;
221
    int ones;
222
    static const int cbp_masks[3] = {0x100000, 0x010000, 0x110000};
223
    static const int shifts[4] = { 0, 2, 8, 10 };
224
    int *curshift = shifts;
225
    int i, t, mask;
226

    
227
    code = get_vlc2(gb, vlc->cbppattern[table].table, 9, 2);
228
    pattern = code & 0xF;
229
    code >>= 4;
230

    
231
    ones = rv34_count_ones[pattern];
232

    
233
    for(mask = 8; mask; mask >>= 1, curshift++){
234
        if(pattern & mask)
235
            cbp |= get_vlc2(gb, vlc->cbp[table][ones].table, vlc->cbp[table][ones].bits, 1) << curshift[0];
236
    }
237

    
238
    for(i = 0; i < 4; i++){
239
        t = modulo_three_table[code][i];
240
        if(t == 1)
241
            cbp |= cbp_masks[get_bits1(gb)] << i;
242
        if(t == 2)
243
            cbp |= cbp_masks[2] << i;
244
    }
245
    return cbp;
246
}
247

    
248
/**
249
 * Get one coefficient value from the bistream and store it.
250
 */
251
static inline void decode_coeff(DCTELEM *dst, int coef, int esc, GetBitContext *gb, VLC* vlc)
252
{
253
    if(coef){
254
        if(coef == esc){
255
            coef = get_vlc2(gb, vlc->table, 9, 2);
256
            if(coef > 23){
257
                coef -= 23;
258
                coef = 22 + ((1 << coef) | get_bits(gb, coef));
259
            }
260
            coef += esc;
261
        }
262
        if(get_bits1(gb))
263
            coef = -coef;
264
        *dst = coef;
265
    }
266
}
267

    
268
/**
269
 * Decode 2x2 subblock of coefficients.
270
 */
271
static inline void decode_subblock(DCTELEM *dst, int code, const int is_block2, GetBitContext *gb, VLC *vlc)
272
{
273
    int coeffs[4];
274

    
275
    coeffs[0] = modulo_three_table[code][0];
276
    coeffs[1] = modulo_three_table[code][1];
277
    coeffs[2] = modulo_three_table[code][2];
278
    coeffs[3] = modulo_three_table[code][3];
279
    decode_coeff(dst  , coeffs[0], 3, gb, vlc);
280
    if(is_block2){
281
        decode_coeff(dst+8, coeffs[1], 2, gb, vlc);
282
        decode_coeff(dst+1, coeffs[2], 2, gb, vlc);
283
    }else{
284
        decode_coeff(dst+1, coeffs[1], 2, gb, vlc);
285
        decode_coeff(dst+8, coeffs[2], 2, gb, vlc);
286
    }
287
    decode_coeff(dst+9, coeffs[3], 2, gb, vlc);
288
}
289

    
290
/**
291
 * Decode coefficients for 4x4 block.
292
 *
293
 * This is done by filling 2x2 subblocks with decoded coefficients
294
 * in this order (the same for subblocks and subblock coefficients):
295
 *  o--o
296
 *    /
297
 *   /
298
 *  o--o
299
 */
300

    
301
static inline void rv34_decode_block(DCTELEM *dst, GetBitContext *gb, RV34VLC *rvlc, int fc, int sc)
302
{
303
    int code, pattern;
304

    
305
    code = get_vlc2(gb, rvlc->first_pattern[fc].table, 9, 2);
306

    
307
    pattern = code & 0x7;
308

    
309
    code >>= 3;
310
    decode_subblock(dst, code, 0, gb, &rvlc->coefficient);
311

    
312
    if(pattern & 4){
313
        code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);
314
        decode_subblock(dst + 2, code, 0, gb, &rvlc->coefficient);
315
    }
316
    if(pattern & 2){ // Looks like coefficients 1 and 2 are swapped for this block
317
        code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);
318
        decode_subblock(dst + 8*2, code, 1, gb, &rvlc->coefficient);
319
    }
320
    if(pattern & 1){
321
        code = get_vlc2(gb, rvlc->third_pattern[sc].table, 9, 2);
322
        decode_subblock(dst + 8*2+2, code, 0, gb, &rvlc->coefficient);
323
    }
324

    
325
}
326

    
327
/**
328
 * Dequantize ordinary 4x4 block.
329
 * @todo optimize
330
 */
331
static inline void rv34_dequant4x4(DCTELEM *block, int Qdc, int Q)
332
{
333
    int i, j;
334

    
335
    block[0] = (block[0] * Qdc + 8) >> 4;
336
    for(i = 0; i < 4; i++)
337
        for(j = !i; j < 4; j++)
338
            block[j + i*8] = (block[j + i*8] * Q + 8) >> 4;
339
}
340

    
341
/**
342
 * Dequantize 4x4 block of DC values for 16x16 macroblock.
343
 * @todo optimize
344
 */
345
static inline void rv34_dequant4x4_16x16(DCTELEM *block, int Qdc, int Q)
346
{
347
    int i;
348

    
349
    for(i = 0; i < 3; i++)
350
         block[rv34_dezigzag[i]] = (block[rv34_dezigzag[i]] * Qdc + 8) >> 4;
351
    for(; i < 16; i++)
352
         block[rv34_dezigzag[i]] = (block[rv34_dezigzag[i]] * Q + 8) >> 4;
353
}
354
/** @} */ //block functions
355

    
356

    
357
/**
358
 * @defgroup bitstream RV30/40 bitstream parsing
359
 * @{
360
 */
361

    
362
/**
363
 * Decode starting slice position.
364
 * @todo Maybe replace with ff_h263_decode_mba() ?
365
 */
366
int ff_rv34_get_start_offset(GetBitContext *gb, int mb_size)
367
{
368
    int i;
369
    for(i = 0; i < 5; i++)
370
        if(rv34_mb_max_sizes[i] > mb_size)
371
            break;
372
    return rv34_mb_bits_sizes[i];
373
}
374

    
375
/**
376
 * Select VLC set for decoding from current quantizer, modifier and frame type.
377
 */
378
static inline RV34VLC* choose_vlc_set(int quant, int mod, int type)
379
{
380
    if(mod == 2 && quant < 19) quant += 10;
381
    else if(mod && quant < 26) quant += 5;
382
    return type ? &inter_vlcs[rv34_quant_to_vlc_set[1][av_clip(quant, 0, 30)]]
383
                : &intra_vlcs[rv34_quant_to_vlc_set[0][av_clip(quant, 0, 30)]];
384
}
385

    
386
/**
387
 * Decode quantizer difference and return modified quantizer.
388
 */
389
static inline int rv34_decode_dquant(GetBitContext *gb, int quant)
390
{
391
    if(get_bits1(gb))
392
        return rv34_dquant_tab[get_bits1(gb)][quant];
393
    else
394
        return get_bits(gb, 5);
395
}
396

    
397
/** @} */ //bitstream functions
398

    
399
/**
400
 * @defgroup mv motion vector related code (prediction, reconstruction, motion compensation)
401
 * @{
402
 */
403

    
404
/** macroblock partition width in 8x8 blocks */
405
static const uint8_t part_sizes_w[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 2 };
406

    
407
/** macroblock partition height in 8x8 blocks */
408
static const uint8_t part_sizes_h[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2 };
409

    
410
/** availability index for subblocks */
411
static const uint8_t avail_indexes[4] = { 5, 6, 9, 10 };
412

    
413
/**
414
 * motion vector prediction
415
 *
416
 * Motion prediction performed for the block by using median prediction of
417
 * motion vectors from the left, top and right top blocks but in corner cases
418
 * some other vectors may be used instead.
419
 */
420
static void rv34_pred_mv(RV34DecContext *r, int block_type, int subblock_no, int dmv_no)
421
{
422
    MpegEncContext *s = &r->s;
423
    int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
424
    int A[2] = {0}, B[2], C[2];
425
    int i, j;
426
    int mx, my;
427
    int avail_index = avail_indexes[subblock_no];
428
    int c_off = part_sizes_w[block_type];
429

    
430
    mv_pos += (subblock_no & 1) + (subblock_no >> 1)*s->b8_stride;
431
    if(subblock_no == 3)
432
        c_off = -1;
433

    
434
    if(r->avail_cache[avail_index - 1]){
435
        A[0] = s->current_picture_ptr->motion_val[0][mv_pos-1][0];
436
        A[1] = s->current_picture_ptr->motion_val[0][mv_pos-1][1];
437
    }
438
    if(r->avail_cache[avail_index - 4]){
439
        B[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][0];
440
        B[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][1];
441
    }else{
442
        B[0] = A[0];
443
        B[1] = A[1];
444
    }
445
    if(!r->avail_cache[avail_index - 4 + c_off]){
446
        if(r->avail_cache[avail_index - 4] && (r->avail_cache[avail_index - 1] || r->rv30)){
447
            C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][0];
448
            C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][1];
449
        }else{
450
            C[0] = A[0];
451
            C[1] = A[1];
452
        }
453
    }else{
454
        C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+c_off][0];
455
        C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+c_off][1];
456
    }
457
    mx = mid_pred(A[0], B[0], C[0]);
458
    my = mid_pred(A[1], B[1], C[1]);
459
    mx += r->dmv[dmv_no][0];
460
    my += r->dmv[dmv_no][1];
461
    for(j = 0; j < part_sizes_h[block_type]; j++){
462
        for(i = 0; i < part_sizes_w[block_type]; i++){
463
            s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][0] = mx;
464
            s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][1] = my;
465
        }
466
    }
467
}
468

    
469
/**
470
 * Calculate motion vector component that should be added for direct blocks.
471
 */
472
static int calc_add_mv(MpegEncContext *s, int dir, int component)
473
{
474
    int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
475
    int sum;
476

    
477
    sum = (s->next_picture_ptr->motion_val[0][mv_pos][component] +
478
           s->next_picture_ptr->motion_val[0][mv_pos + 1][component] +
479
           s->next_picture_ptr->motion_val[0][mv_pos + s->b8_stride][component] +
480
           s->next_picture_ptr->motion_val[0][mv_pos + s->b8_stride + 1][component]) >> 2;
481
    return dir ? -(sum >> 1) : ((sum + 1) >> 1);
482
}
483

    
484
/**
485
 * Predict motion vector for B-frame macroblock.
486
 */
487
static inline void rv34_pred_b_vector(int A[2], int B[2], int C[2],
488
                                      int A_avail, int B_avail, int C_avail,
489
                                      int *mx, int *my)
490
{
491
    if(A_avail + B_avail + C_avail != 3){
492
        *mx = A[0] + B[0] + C[0];
493
        *my = A[1] + B[1] + C[1];
494
        if(A_avail + B_avail + C_avail == 2){
495
            *mx /= 2;
496
            *my /= 2;
497
        }
498
    }else{
499
        *mx = mid_pred(A[0], B[0], C[0]);
500
        *my = mid_pred(A[1], B[1], C[1]);
501
    }
502
}
503

    
504
/**
505
 * motion vector prediction for B-frames
506
 */
507
static void rv34_pred_mv_b(RV34DecContext *r, int block_type, int dir)
508
{
509
    MpegEncContext *s = &r->s;
510
    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
511
    int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
512
    int A[2], B[2], C[2];
513
    int has_A = 0, has_B = 0, has_C = 0;
514
    int mx, my;
515
    int i, j;
516
    Picture *cur_pic = s->current_picture_ptr;
517
    const int mask = dir ? MB_TYPE_L1 : MB_TYPE_L0;
518
    int type = cur_pic->mb_type[mb_pos];
519

    
520
    memset(A, 0, sizeof(A));
521
    memset(B, 0, sizeof(B));
522
    memset(C, 0, sizeof(C));
523
    if((r->avail_cache[5-1] & type) & mask){
524
        A[0] = cur_pic->motion_val[dir][mv_pos - 1][0];
525
        A[1] = cur_pic->motion_val[dir][mv_pos - 1][1];
526
        has_A = 1;
527
    }
528
    if((r->avail_cache[5-4] & type) & mask){
529
        B[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][0];
530
        B[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][1];
531
        has_B = 1;
532
    }
533
    if((r->avail_cache[5-2] & type) & mask){
534
        C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][0];
535
        C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][1];
536
        has_C = 1;
537
    }else if((s->mb_x+1) == s->mb_width && (r->avail_cache[5-5] & type) & mask){
538
        C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride - 1][0];
539
        C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride - 1][1];
540
        has_C = 1;
541
    }
542

    
543
    rv34_pred_b_vector(A, B, C, has_A, has_B, has_C, &mx, &my);
544

    
545
    mx += r->dmv[dir][0];
546
    my += r->dmv[dir][1];
547

    
548
    if(block_type == RV34_MB_B_DIRECT){
549
        mx += calc_add_mv(s, dir, 0);
550
        my += calc_add_mv(s, dir, 1);
551
    }
552
    for(j = 0; j < 2; j++){
553
        for(i = 0; i < 2; i++){
554
            cur_pic->motion_val[dir][mv_pos + i + j*s->b8_stride][0] = mx;
555
            cur_pic->motion_val[dir][mv_pos + i + j*s->b8_stride][1] = my;
556
        }
557
    }
558
    if(block_type == RV34_MB_B_BACKWARD || block_type == RV34_MB_B_FORWARD)
559
        fill_rectangle(cur_pic->motion_val[!dir][mv_pos], 2, 2, s->b8_stride, 0, 4);
560
}
561

    
562
static const int chroma_coeffs[3] = { 8, 5, 3 };
563

    
564
/**
565
 * generic motion compensation function
566
 *
567
 * @param r decoder context
568
 * @param block_type type of the current block
569
 * @param xoff horizontal offset from the start of the current block
570
 * @param yoff vertical offset from the start of the current block
571
 * @param mv_off offset to the motion vector information
572
 * @param width width of the current partition in 8x8 blocks
573
 * @param height height of the current partition in 8x8 blocks
574
 */
575
static inline void rv34_mc(RV34DecContext *r, const int block_type,
576
                          const int xoff, const int yoff, int mv_off,
577
                          const int width, const int height, int dir,
578
                          const int thirdpel,
579
                          qpel_mc_func (*qpel_mc)[16],
580
                          h264_chroma_mc_func (*chroma_mc))
581
{
582
    MpegEncContext *s = &r->s;
583
    uint8_t *Y, *U, *V, *srcY, *srcU, *srcV;
584
    int dxy, mx, my, lx, ly, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;
585
    int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride + mv_off;
586
    int is16x16 = 1;
587

    
588
    if(thirdpel){
589
        mx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + (3 << 24)) / 3 - (1 << 24);
590
        my = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + (3 << 24)) / 3 - (1 << 24);
591
        lx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + (3 << 24)) % 3;
592
        ly = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + (3 << 24)) % 3;
593
        uvmx = chroma_coeffs[(3*(mx&1) + lx) >> 1];
594
        uvmy = chroma_coeffs[(3*(my&1) + ly) >> 1];
595
    }else{
596
        mx = s->current_picture_ptr->motion_val[dir][mv_pos][0] >> 2;
597
        my = s->current_picture_ptr->motion_val[dir][mv_pos][1] >> 2;
598
        lx = s->current_picture_ptr->motion_val[dir][mv_pos][0] & 3;
599
        ly = s->current_picture_ptr->motion_val[dir][mv_pos][1] & 3;
600
        uvmx = mx & 6;
601
        uvmy = my & 6;
602
    }
603
    dxy = ly*4 + lx;
604
    srcY = dir ? s->next_picture_ptr->data[0] : s->last_picture_ptr->data[0];
605
    srcU = dir ? s->next_picture_ptr->data[1] : s->last_picture_ptr->data[1];
606
    srcV = dir ? s->next_picture_ptr->data[2] : s->last_picture_ptr->data[2];
607
    src_x = s->mb_x * 16 + xoff + mx;
608
    src_y = s->mb_y * 16 + yoff + my;
609
    uvsrc_x = s->mb_x * 8 + (xoff >> 1) + (mx >> 1);
610
    uvsrc_y = s->mb_y * 8 + (yoff >> 1) + (my >> 1);
611
    srcY += src_y * s->linesize + src_x;
612
    srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
613
    srcV += uvsrc_y * s->uvlinesize + uvsrc_x;
614
    if(   (unsigned)(src_x - !!lx*2) > s->h_edge_pos - !!lx*2 - (width <<3) - 3
615
       || (unsigned)(src_y - !!ly*2) > s->v_edge_pos - !!ly*2 - (height<<3) - 3){
616
        uint8_t *uvbuf= s->edge_emu_buffer + 20 * s->linesize;
617

    
618
        srcY -= 2 + 2*s->linesize;
619
        ff_emulated_edge_mc(s->edge_emu_buffer, srcY, s->linesize, (width<<3)+4, (height<<3)+4,
620
                            src_x - 2, src_y - 2, s->h_edge_pos, s->v_edge_pos);
621
        srcY = s->edge_emu_buffer + 2 + 2*s->linesize;
622
        ff_emulated_edge_mc(uvbuf     , srcU, s->uvlinesize, (width<<2)+1, (height<<2)+1,
623
                            uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);
624
        ff_emulated_edge_mc(uvbuf + 16, srcV, s->uvlinesize, (width<<2)+1, (height<<2)+1,
625
                            uvsrc_x, uvsrc_y, s->h_edge_pos >> 1, s->v_edge_pos >> 1);
626
        srcU = uvbuf;
627
        srcV = uvbuf + 16;
628
    }
629
    Y = s->dest[0] + xoff      + yoff     *s->linesize;
630
    U = s->dest[1] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
631
    V = s->dest[2] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
632

    
633
    if(block_type == RV34_MB_P_16x8){
634
        qpel_mc[1][dxy](Y, srcY, s->linesize);
635
        Y    += 8;
636
        srcY += 8;
637
    }else if(block_type == RV34_MB_P_8x16){
638
        qpel_mc[1][dxy](Y, srcY, s->linesize);
639
        Y    += 8 * s->linesize;
640
        srcY += 8 * s->linesize;
641
    }
642
    is16x16 = (block_type != RV34_MB_P_8x8) && (block_type != RV34_MB_P_16x8) && (block_type != RV34_MB_P_8x16);
643
    qpel_mc[!is16x16][dxy](Y, srcY, s->linesize);
644
    chroma_mc[2-width]   (U, srcU, s->uvlinesize, height*4, uvmx, uvmy);
645
    chroma_mc[2-width]   (V, srcV, s->uvlinesize, height*4, uvmx, uvmy);
646
}
647

    
648
static void rv34_mc_1mv(RV34DecContext *r, const int block_type,
649
                        const int xoff, const int yoff, int mv_off,
650
                        const int width, const int height, int dir)
651
{
652
    rv34_mc(r, block_type, xoff, yoff, mv_off, width, height, dir, r->rv30,
653
            r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab
654
                    : r->s.dsp.put_h264_qpel_pixels_tab,
655
            r->s.dsp.put_h264_chroma_pixels_tab);
656
}
657

    
658
static void rv34_mc_2mv(RV34DecContext *r, const int block_type)
659
{
660
    rv34_mc(r, block_type, 0, 0, 0, 2, 2, 0, r->rv30,
661
            r->rv30 ? r->s.dsp.put_rv30_tpel_pixels_tab
662
                    : r->s.dsp.put_h264_qpel_pixels_tab,
663
            r->s.dsp.put_h264_chroma_pixels_tab);
664
    rv34_mc(r, block_type, 0, 0, 0, 2, 2, 1, r->rv30,
665
            r->rv30 ? r->s.dsp.avg_rv30_tpel_pixels_tab
666
                    : r->s.dsp.avg_h264_qpel_pixels_tab,
667
            r->s.dsp.avg_h264_chroma_pixels_tab);
668
}
669

    
670
/** number of motion vectors in each macroblock type */
671
static const int num_mvs[RV34_MB_TYPES] = { 0, 0, 1, 4, 1, 1, 0, 0, 2, 2, 2, 1 };
672

    
673
/**
674
 * Decode motion vector differences
675
 * and perform motion vector reconstruction and motion compensation.
676
 */
677
static int rv34_decode_mv(RV34DecContext *r, int block_type)
678
{
679
    MpegEncContext *s = &r->s;
680
    GetBitContext *gb = &s->gb;
681
    int i;
682

    
683
    memset(r->dmv, 0, sizeof(r->dmv));
684
    for(i = 0; i < num_mvs[block_type]; i++){
685
        r->dmv[i][0] = svq3_get_se_golomb(gb);
686
        r->dmv[i][1] = svq3_get_se_golomb(gb);
687
    }
688
    switch(block_type){
689
    case RV34_MB_TYPE_INTRA:
690
    case RV34_MB_TYPE_INTRA16x16:
691
        fill_rectangle(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], 2, 2, s->b8_stride, 0, 4);
692
        return 0;
693
    case RV34_MB_SKIP:
694
        if(s->pict_type == P_TYPE){
695
            fill_rectangle(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], 2, 2, s->b8_stride, 0, 4);
696
            rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);
697
            break;
698
        }
699
    case RV34_MB_B_DIRECT:
700
        rv34_pred_mv_b  (r, RV34_MB_B_DIRECT, 0);
701
        rv34_pred_mv_b  (r, RV34_MB_B_DIRECT, 1);
702
        rv34_mc_2mv     (r, RV34_MB_B_DIRECT);
703
        break;
704
    case RV34_MB_P_16x16:
705
    case RV34_MB_P_MIX16x16:
706
        rv34_pred_mv(r, block_type, 0, 0);
707
        rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);
708
        break;
709
    case RV34_MB_B_FORWARD:
710
    case RV34_MB_B_BACKWARD:
711
        r->dmv[1][0] = r->dmv[0][0];
712
        r->dmv[1][1] = r->dmv[0][1];
713
        rv34_pred_mv_b  (r, block_type, block_type == RV34_MB_B_BACKWARD);
714
        rv34_mc_1mv     (r, block_type, 0, 0, 0, 2, 2, block_type == RV34_MB_B_BACKWARD);
715
        break;
716
    case RV34_MB_P_16x8:
717
    case RV34_MB_P_8x16:
718
        rv34_pred_mv(r, block_type, 0, 0);
719
        rv34_pred_mv(r, block_type, 1 + (block_type == RV34_MB_P_16x8), 1);
720
        if(block_type == RV34_MB_P_16x8){
721
            rv34_mc_1mv(r, block_type, 0, 0, 0,            2, 1, 0);
722
            rv34_mc_1mv(r, block_type, 0, 8, s->b8_stride, 2, 1, 0);
723
        }
724
        if(block_type == RV34_MB_P_8x16){
725
            rv34_mc_1mv(r, block_type, 0, 0, 0, 1, 2, 0);
726
            rv34_mc_1mv(r, block_type, 8, 0, 1, 1, 2, 0);
727
        }
728
        break;
729
    case RV34_MB_B_BIDIR:
730
        rv34_pred_mv_b  (r, block_type, 0);
731
        rv34_pred_mv_b  (r, block_type, 1);
732
        rv34_mc_2mv     (r, block_type);
733
        break;
734
    case RV34_MB_P_8x8:
735
        for(i=0;i< 4;i++){
736
            rv34_pred_mv(r, block_type, i, i);
737
            rv34_mc_1mv (r, block_type, (i&1)<<3, (i&2)<<2, (i&1)+(i>>1)*s->b8_stride, 1, 1, 0);
738
        }
739
        break;
740
    }
741

    
742
    return 0;
743
}
744
/** @} */ // mv group
745

    
746
/**
747
 * @defgroup recons Macroblock reconstruction functions
748
 * @{
749
 */
750
/** mapping of RV30/40 intra prediction types to standard H.264 types */
751
static const int ittrans[9] = {
752
 DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,
753
 VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,
754
};
755

    
756
/** mapping of RV30/40 intra 16x16 prediction types to standard H.264 types */
757
static const int ittrans16[4] = {
758
 DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,
759
};
760

    
761
/**
762
 * Perform 4x4 intra prediction.
763
 */
764
static void rv34_pred_4x4_block(RV34DecContext *r, uint8_t *dst, int stride, int itype, int up, int left, int down, int right)
765
{
766
    uint8_t *prev = dst - stride + 4;
767
    uint32_t topleft;
768

    
769
    if(!up && !left)
770
        itype = DC_128_PRED;
771
    else if(!up){
772
        if(itype == VERT_PRED) itype = HOR_PRED;
773
        if(itype == DC_PRED)   itype = LEFT_DC_PRED;
774
    }else if(!left){
775
        if(itype == HOR_PRED)  itype = VERT_PRED;
776
        if(itype == DC_PRED)   itype = TOP_DC_PRED;
777
        if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;
778
    }
779
    if(!down){
780
        if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;
781
        if(itype == HOR_UP_PRED) itype = HOR_UP_PRED_RV40_NODOWN;
782
        if(itype == VERT_LEFT_PRED) itype = VERT_LEFT_PRED_RV40_NODOWN;
783
    }
784
    if(!right && up){
785
        topleft = dst[-stride + 3] * 0x01010101;
786
        prev = &topleft;
787
    }
788
    r->h.pred4x4[itype](dst, prev, stride);
789
}
790

    
791
/** add_pixels_clamped for 4x4 block */
792
static void rv34_add_4x4_block(uint8_t *dst, int stride, DCTELEM block[64], int off)
793
{
794
    int x, y;
795
    for(y = 0; y < 4; y++)
796
        for(x = 0; x < 4; x++)
797
            dst[x + y*stride] = av_clip_uint8(dst[x + y*stride] + block[off + x+y*8]);
798
}
799

    
800
static inline int adjust_pred16(int itype, int up, int left)
801
{
802
    if(!up && !left)
803
        itype = DC_128_PRED8x8;
804
    else if(!up){
805
        if(itype == PLANE_PRED8x8)itype = HOR_PRED8x8;
806
        if(itype == VERT_PRED8x8) itype = HOR_PRED8x8;
807
        if(itype == DC_PRED8x8)   itype = LEFT_DC_PRED8x8;
808
    }else if(!left){
809
        if(itype == PLANE_PRED8x8)itype = VERT_PRED8x8;
810
        if(itype == HOR_PRED8x8)  itype = VERT_PRED8x8;
811
        if(itype == DC_PRED8x8)   itype = TOP_DC_PRED8x8;
812
    }
813
    return itype;
814
}
815

    
816
static void rv34_output_macroblock(RV34DecContext *r, int8_t *intra_types, int cbp, int is16)
817
{
818
    MpegEncContext *s = &r->s;
819
    DSPContext *dsp = &s->dsp;
820
    int i, j;
821
    uint8_t *Y, *U, *V;
822
    int itype;
823
    int avail[6*8] = {0};
824
    int idx;
825

    
826
    // Set neighbour information.
827
    if(r->avail_cache[0])
828
        avail[0] = 1;
829
    if(r->avail_cache[1])
830
        avail[1] = avail[2] = 1;
831
    if(r->avail_cache[2])
832
        avail[3] = avail[4] = 1;
833
    if(r->avail_cache[3])
834
        avail[5] = 1;
835
    if(r->avail_cache[4])
836
        avail[8] = avail[16] = 1;
837
    if(r->avail_cache[8])
838
        avail[24] = avail[32] = 1;
839

    
840
    Y = s->dest[0];
841
    U = s->dest[1];
842
    V = s->dest[2];
843
    if(!is16){
844
        for(j = 0; j < 4; j++){
845
            idx = 9 + j*8;
846
            for(i = 0; i < 4; i++, cbp >>= 1, Y += 4, idx++){
847
                rv34_pred_4x4_block(r, Y, s->linesize, ittrans[intra_types[i]], avail[idx-8], avail[idx-1], avail[idx+7], avail[idx-7]);
848
                avail[idx] = 1;
849
                if(cbp & 1)
850
                    rv34_add_4x4_block(Y, s->linesize, s->block[(i>>1)+(j&2)], (i&1)*4+(j&1)*32);
851
            }
852
            Y += s->linesize * 4 - 4*4;
853
            intra_types += s->b4_stride;
854
        }
855
        intra_types -= s->b4_stride * 4;
856
        fill_rectangle(r->avail_cache + 5, 2, 2, 4, 0, 4);
857
        for(j = 0; j < 2; j++){
858
            idx = 5 + j*4;
859
            for(i = 0; i < 2; i++, cbp >>= 1, idx++){
860
                rv34_pred_4x4_block(r, U + i*4 + j*4*s->uvlinesize, s->uvlinesize, ittrans[intra_types[i*2+j*2*s->b4_stride]], r->avail_cache[idx-4], r->avail_cache[idx-1], !i && !j, r->avail_cache[idx-3]);
861
                rv34_pred_4x4_block(r, V + i*4 + j*4*s->uvlinesize, s->uvlinesize, ittrans[intra_types[i*2+j*2*s->b4_stride]], r->avail_cache[idx-4], r->avail_cache[idx-1], !i && !j, r->avail_cache[idx-3]);
862
                r->avail_cache[idx] = 1;
863
                if(cbp & 0x01)
864
                    rv34_add_4x4_block(U + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[4], i*4+j*32);
865
                if(cbp & 0x10)
866
                    rv34_add_4x4_block(V + i*4 + j*4*s->uvlinesize, s->uvlinesize, s->block[5], i*4+j*32);
867
            }
868
        }
869
    }else{
870
        itype = ittrans16[intra_types[0]];
871
        itype = adjust_pred16(itype, r->avail_cache[5-4], r->avail_cache[5-1]);
872
        r->h.pred16x16[itype](Y, s->linesize);
873
        dsp->add_pixels_clamped(s->block[0], Y,     s->current_picture.linesize[0]);
874
        dsp->add_pixels_clamped(s->block[1], Y + 8, s->current_picture.linesize[0]);
875
        Y += s->current_picture.linesize[0] * 8;
876
        dsp->add_pixels_clamped(s->block[2], Y,     s->current_picture.linesize[0]);
877
        dsp->add_pixels_clamped(s->block[3], Y + 8, s->current_picture.linesize[0]);
878

    
879
        itype = ittrans16[intra_types[0]];
880
        if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;
881
        itype = adjust_pred16(itype, r->avail_cache[5-4], r->avail_cache[5-1]);
882
        r->h.pred8x8[itype](U, s->uvlinesize);
883
        dsp->add_pixels_clamped(s->block[4], U, s->uvlinesize);
884
        r->h.pred8x8[itype](V, s->uvlinesize);
885
        dsp->add_pixels_clamped(s->block[5], V, s->uvlinesize);
886
    }
887
}
888

    
889
/** @} */ // recons group
890

    
891
/**
892
 * @addtogroup bitstream
893
 * Decode macroblock header and return CBP in case of success, -1 otherwise.
894
 */
895
static int rv34_decode_mb_header(RV34DecContext *r, int8_t *intra_types)
896
{
897
    MpegEncContext *s = &r->s;
898
    GetBitContext *gb = &s->gb;
899
    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
900
    int i, t;
901

    
902
    if(!r->si.type){
903
        r->is16 = get_bits1(gb);
904
        if(!r->is16 && !r->rv30){
905
            if(!get_bits1(gb))
906
                av_log(s->avctx, AV_LOG_ERROR, "Need DQUANT\n");
907
        }
908
        s->current_picture_ptr->mb_type[mb_pos] = r->is16 ? MB_TYPE_INTRA16x16 : MB_TYPE_INTRA;
909
        r->block_type = r->is16 ? RV34_MB_TYPE_INTRA16x16 : RV34_MB_TYPE_INTRA;
910
    }else{
911
        r->block_type = r->decode_mb_info(r);
912
        if(r->block_type == -1)
913
            return -1;
914
        s->current_picture_ptr->mb_type[mb_pos] = rv34_mb_type_to_lavc[r->block_type];
915
        r->mb_type[mb_pos] = r->block_type;
916
        if(r->block_type == RV34_MB_SKIP){
917
            if(s->pict_type == P_TYPE)
918
                r->mb_type[mb_pos] = RV34_MB_P_16x16;
919
            if(s->pict_type == B_TYPE)
920
                r->mb_type[mb_pos] = RV34_MB_B_DIRECT;
921
        }
922
        r->is16 = !!IS_INTRA16x16(s->current_picture_ptr->mb_type[mb_pos]);
923
        rv34_decode_mv(r, r->block_type);
924
        if(r->block_type == RV34_MB_SKIP){
925
            fill_rectangle(intra_types, 4, 4, s->b4_stride, 0, sizeof(intra_types[0]));
926
            return 0;
927
        }
928
        r->chroma_vlc = 1;
929
        r->luma_vlc   = 0;
930
    }
931
    if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){
932
        if(r->is16){
933
            t = get_bits(gb, 2);
934
            fill_rectangle(intra_types, 4, 4, s->b4_stride, t, sizeof(intra_types[0]));
935
            r->luma_vlc   = 2;
936
        }else{
937
            if(r->decode_intra_types(r, gb, intra_types) < 0)
938
                return -1;
939
            r->luma_vlc   = 1;
940
        }
941
        r->chroma_vlc = 0;
942
        r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
943
    }else{
944
        for(i = 0; i < 16; i++)
945
            intra_types[(i & 3) + (i>>2) * s->b4_stride] = 0;
946
        r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);
947
        if(r->mb_type[mb_pos] == RV34_MB_P_MIX16x16){
948
            r->is16 = 1;
949
            r->chroma_vlc = 1;
950
            r->luma_vlc   = 2;
951
            r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
952
        }
953
    }
954

    
955
    return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);
956
}
957

    
958
/**
959
 * @addtogroup recons
960
 * @{
961
 */
962
/**
963
 * mask for retrieving all bits in coded block pattern
964
 * corresponding to one 8x8 block
965
 */
966
#define LUMA_CBP_BLOCK_MASK 0x303
967

    
968
#define U_CBP_MASK 0x0F0000
969
#define V_CBP_MASK 0xF00000
970

    
971

    
972
static void rv34_apply_differences(RV34DecContext *r, int cbp)
973
{
974
    static const int shifts[4] = { 0, 2, 8, 10 };
975
    MpegEncContext *s = &r->s;
976
    int i;
977

    
978
    for(i = 0; i < 4; i++)
979
        if(cbp & (LUMA_CBP_BLOCK_MASK << shifts[i]))
980
            s->dsp.add_pixels_clamped(s->block[i], s->dest[0] + (i & 1)*8 + (i&2)*4*s->linesize, s->linesize);
981
    if(cbp & U_CBP_MASK)
982
        s->dsp.add_pixels_clamped(s->block[4], s->dest[1], s->uvlinesize);
983
    if(cbp & V_CBP_MASK)
984
        s->dsp.add_pixels_clamped(s->block[5], s->dest[2], s->uvlinesize);
985
}
986

    
987
static int rv34_decode_macroblock(RV34DecContext *r, int8_t *intra_types)
988
{
989
    MpegEncContext *s = &r->s;
990
    GetBitContext *gb = &s->gb;
991
    int cbp, cbp2;
992
    int i, blknum, blkoff;
993
    DCTELEM block16[64];
994
    int luma_dc_quant;
995
    int dist;
996
    int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
997

    
998
    // Calculate which neighbours are available. Maybe it's worth optimizing too.
999
    memset(r->avail_cache, 0, sizeof(r->avail_cache));
1000
    fill_rectangle(r->avail_cache + 5, 2, 2, 4, 1, 4);
1001
    dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;
1002
    if(s->mb_x && dist)
1003
        r->avail_cache[4] =
1004
        r->avail_cache[8] = s->current_picture_ptr->mb_type[mb_pos - 1];
1005
    if(dist >= s->mb_width)
1006
        r->avail_cache[1] =
1007
        r->avail_cache[2] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];
1008
    if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)
1009
        r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];
1010
    if(s->mb_x && dist > s->mb_width)
1011
        r->avail_cache[0] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];
1012

    
1013
    s->qscale = r->si.quant;
1014
    cbp = cbp2 = rv34_decode_mb_header(r, intra_types);
1015
    r->cbp_luma  [s->mb_x + s->mb_y * s->mb_stride] = cbp;
1016
    r->cbp_chroma[s->mb_x + s->mb_y * s->mb_stride] = cbp >> 16;
1017
    s->current_picture.qscale_table[s->mb_x + s->mb_y * s->mb_stride] = s->qscale;
1018

    
1019
    if(cbp == -1)
1020
        return -1;
1021

    
1022
    luma_dc_quant = r->si.type ? r->luma_dc_quant_p[s->qscale] : r->luma_dc_quant_i[s->qscale];
1023
    if(r->is16){
1024
        memset(block16, 0, sizeof(block16));
1025
        rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0);
1026
        rv34_dequant4x4_16x16(block16, rv34_qscale_tab[luma_dc_quant],rv34_qscale_tab[s->qscale]);
1027
        rv34_inv_transform_noround(block16);
1028
    }
1029

    
1030
    for(i = 0; i < 16; i++, cbp >>= 1){
1031
        if(!r->is16 && !(cbp & 1)) continue;
1032
        blknum = ((i & 2) >> 1) + ((i & 8) >> 2);
1033
        blkoff = ((i & 1) << 2) + ((i & 4) << 3);
1034
        if(cbp & 1)
1035
            rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->luma_vlc, 0);
1036
        rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[luma_dc_quant],rv34_qscale_tab[s->qscale]);
1037
        if(r->is16) //FIXME: optimize
1038
            s->block[blknum][blkoff] = block16[(i & 3) | ((i & 0xC) << 1)];
1039
        rv34_inv_transform(s->block[blknum] + blkoff);
1040
    }
1041
    if(r->block_type == RV34_MB_P_MIX16x16)
1042
        r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);
1043
    for(; i < 24; i++, cbp >>= 1){
1044
        if(!(cbp & 1)) continue;
1045
        blknum = ((i & 4) >> 2) + 4;
1046
        blkoff = ((i & 1) << 2) + ((i & 2) << 4);
1047
        rv34_decode_block(s->block[blknum] + blkoff, gb, r->cur_vlcs, r->chroma_vlc, 1);
1048
        rv34_dequant4x4(s->block[blknum] + blkoff, rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]],rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]]);
1049
        rv34_inv_transform(s->block[blknum] + blkoff);
1050
    }
1051
    if(IS_INTRA(s->current_picture_ptr->mb_type[s->mb_x + s->mb_y*s->mb_stride]))
1052
        rv34_output_macroblock(r, intra_types, cbp2, r->is16);
1053
    else
1054
        rv34_apply_differences(r, cbp2);
1055

    
1056
    return 0;
1057
}
1058

    
1059
static int check_slice_end(RV34DecContext *r, MpegEncContext *s)
1060
{
1061
    int bits;
1062
    if(s->mb_y >= s->mb_height)
1063
        return 1;
1064
    if(!s->mb_num_left)
1065
        return 1;
1066
    if(r->s.mb_skip_run > 1)
1067
        return 0;
1068
    bits = r->bits - get_bits_count(&s->gb);
1069
    if(bits < 0 || (bits < 8 && !show_bits(&s->gb, bits)))
1070
        return 1;
1071
    return 0;
1072
}
1073

    
1074
static inline int slice_compare(SliceInfo *si1, SliceInfo *si2)
1075
{
1076
    return si1->type   != si2->type  ||
1077
           si1->start  >= si2->start ||
1078
           si1->width  != si2->width ||
1079
           si1->height != si2->height;
1080
}
1081

    
1082
static int rv34_decode_slice(RV34DecContext *r, int end, uint8_t* buf, int buf_size)
1083
{
1084
    MpegEncContext *s = &r->s;
1085
    GetBitContext *gb = &s->gb;
1086
    int mb_pos;
1087
    int res;
1088

    
1089
    init_get_bits(&r->s.gb, buf, buf_size*8);
1090
    res = r->parse_slice_header(r, gb, &r->si);
1091
    if(res < 0){
1092
        av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");
1093
        return -1;
1094
    }
1095

    
1096
    if ((s->mb_x == 0 && s->mb_y == 0) || s->current_picture_ptr==NULL) {
1097
        if(s->width != r->si.width || s->height != r->si.height){
1098
            av_log(s->avctx, AV_LOG_DEBUG, "Changing dimensions to %dx%d\n", r->si.width,r->si.height);
1099
            MPV_common_end(s);
1100
            s->width  = r->si.width;
1101
            s->height = r->si.height;
1102
            if(MPV_common_init(s) < 0)
1103
                return -1;
1104
            r->intra_types_hist = av_realloc(r->intra_types_hist, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));
1105
            r->intra_types = r->intra_types_hist + s->b4_stride * 4;
1106
            r->mb_type = av_realloc(r->mb_type, r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));
1107
            r->cbp_luma   = av_realloc(r->cbp_luma,   r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));
1108
            r->cbp_chroma = av_realloc(r->cbp_chroma, r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));
1109
        }
1110
        s->pict_type = r->si.type ? r->si.type : I_TYPE;
1111
        if(MPV_frame_start(s, s->avctx) < 0)
1112
            return -1;
1113
        ff_er_frame_start(s);
1114
        s->current_picture_ptr = &s->current_picture;
1115
        s->mb_x = s->mb_y = 0;
1116
    }
1117

    
1118
    r->si.end = end;
1119
    s->qscale = r->si.quant;
1120
    r->bits = buf_size*8;
1121
    s->mb_num_left = r->si.end - r->si.start;
1122
    r->s.mb_skip_run = 0;
1123

    
1124
    mb_pos = s->mb_x + s->mb_y * s->mb_width;
1125
    if(r->si.start != mb_pos){
1126
        av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);
1127
        s->mb_x = r->si.start % s->mb_width;
1128
        s->mb_y = r->si.start / s->mb_width;
1129
    }
1130
    memset(r->intra_types_hist, -1, s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));
1131
    s->first_slice_line = 1;
1132
    s->resync_mb_x= s->mb_x;
1133
    s->resync_mb_y= s->mb_y;
1134

    
1135
    ff_init_block_index(s);
1136
    while(!check_slice_end(r, s)) {
1137
        ff_update_block_index(s);
1138
        s->dsp.clear_blocks(s->block[0]);
1139

    
1140
        if(rv34_decode_macroblock(r, r->intra_types + s->mb_x * 4 + 1) < 0){
1141
            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);
1142
            return -1;
1143
        }
1144
        if (++s->mb_x == s->mb_width) {
1145
            s->mb_x = 0;
1146
            s->mb_y++;
1147
            ff_init_block_index(s);
1148

    
1149
            memmove(r->intra_types_hist, r->intra_types, s->b4_stride * 4 * sizeof(*r->intra_types_hist));
1150
            memset(r->intra_types, -1, s->b4_stride * 4 * sizeof(*r->intra_types_hist));
1151
        }
1152
        if(s->mb_x == s->resync_mb_x)
1153
            s->first_slice_line=0;
1154
        s->mb_num_left--;
1155
    }
1156
    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);
1157

    
1158
    return (s->mb_y == s->mb_height);
1159
}
1160

    
1161
/** @} */ // recons group end
1162

    
1163
/**
1164
 * Initialize decoder.
1165
 */
1166
int ff_rv34_decode_init(AVCodecContext *avctx)
1167
{
1168
    RV34DecContext *r = avctx->priv_data;
1169
    MpegEncContext *s = &r->s;
1170

    
1171
    MPV_decode_defaults(s);
1172
    s->avctx= avctx;
1173
    s->out_format = FMT_H263;
1174
    s->codec_id= avctx->codec_id;
1175

    
1176
    s->width = avctx->width;
1177
    s->height = avctx->height;
1178

    
1179
    r->s.avctx = avctx;
1180
    avctx->flags |= CODEC_FLAG_EMU_EDGE;
1181
    r->s.flags |= CODEC_FLAG_EMU_EDGE;
1182
    avctx->pix_fmt = PIX_FMT_YUV420P;
1183
    avctx->has_b_frames = 1;
1184
    s->low_delay = 0;
1185

    
1186
    if (MPV_common_init(s) < 0)
1187
        return -1;
1188

    
1189
    ff_h264_pred_init(&r->h, CODEC_ID_RV40);
1190

    
1191
    r->intra_types_hist = av_malloc(s->b4_stride * 4 * 2 * sizeof(*r->intra_types_hist));
1192
    r->intra_types = r->intra_types_hist + s->b4_stride * 4;
1193

    
1194
    r->mb_type = av_mallocz(r->s.mb_stride * r->s.mb_height * sizeof(*r->mb_type));
1195

    
1196
    r->cbp_luma   = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_luma));
1197
    r->cbp_chroma = av_malloc(r->s.mb_stride * r->s.mb_height * sizeof(*r->cbp_chroma));
1198

    
1199
    if(!intra_vlcs[0].cbppattern[0].bits)
1200
        rv34_init_tables();
1201

    
1202
    return 0;
1203
}
1204

    
1205
static int get_slice_offset(AVCodecContext *avctx, uint8_t *buf, int n)
1206
{
1207
    if(avctx->slice_count) return avctx->slice_offset[n];
1208
    else                   return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) :  AV_RB32(buf + n*8);
1209
}
1210

    
1211
int ff_rv34_decode_frame(AVCodecContext *avctx,
1212
                            void *data, int *data_size,
1213
                            uint8_t *buf, int buf_size)
1214
{
1215
    RV34DecContext *r = avctx->priv_data;
1216
    MpegEncContext *s = &r->s;
1217
    AVFrame *pict = data;
1218
    SliceInfo si;
1219
    int i;
1220
    int slice_count;
1221
    uint8_t *slices_hdr = NULL;
1222
    int last = 0;
1223

    
1224
    /* no supplementary picture */
1225
    if (buf_size == 0) {
1226
        /* special case for last picture */
1227
        if (s->low_delay==0 && s->next_picture_ptr) {
1228
            *pict= *(AVFrame*)s->next_picture_ptr;
1229
            s->next_picture_ptr= NULL;
1230

    
1231
            *data_size = sizeof(AVFrame);
1232
        }
1233
        return 0;
1234
    }
1235

    
1236
    if(!avctx->slice_count){
1237
        slice_count = (*buf++) + 1;
1238
        slices_hdr = buf + 4;
1239
        buf += 8 * slice_count;
1240
    }else
1241
        slice_count = avctx->slice_count;
1242

    
1243
    for(i=0; i<slice_count; i++){
1244
        int offset= get_slice_offset(avctx, slices_hdr, i);
1245
        int size;
1246
        if(i+1 == slice_count)
1247
            size= buf_size - offset;
1248
        else
1249
            size= get_slice_offset(avctx, slices_hdr, i+1) - offset;
1250

    
1251
        r->si.end = s->mb_width * s->mb_height;
1252
        if(i+1 < slice_count){
1253
            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);
1254
            if(r->parse_slice_header(r, &r->s.gb, &si) < 0){
1255
                if(i+2 < slice_count)
1256
                    size = get_slice_offset(avctx, slices_hdr, i+2) - offset;
1257
                else
1258
                    size = buf_size - offset;
1259
            }else
1260
                r->si.end = si.start;
1261
        }
1262
        last = rv34_decode_slice(r, r->si.end, buf + offset, size);
1263
        s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;
1264
        if(last)
1265
            break;
1266
    }
1267

    
1268
    if(last){
1269
        if(r->loop_filter)
1270
            r->loop_filter(r);
1271
        ff_er_frame_end(s);
1272
        MPV_frame_end(s);
1273
        if (s->pict_type == B_TYPE || s->low_delay) {
1274
            *pict= *(AVFrame*)s->current_picture_ptr;
1275
        } else if (s->last_picture_ptr != NULL) {
1276
            *pict= *(AVFrame*)s->last_picture_ptr;
1277
        }
1278

    
1279
        if(s->last_picture_ptr || s->low_delay){
1280
            *data_size = sizeof(AVFrame);
1281
            ff_print_debug_info(s, pict);
1282
        }
1283
        s->current_picture_ptr= NULL; //so we can detect if frame_end wasnt called (find some nicer solution...)
1284
    }
1285
    return buf_size;
1286
}
1287

    
1288
int ff_rv34_decode_end(AVCodecContext *avctx)
1289
{
1290
    RV34DecContext *r = avctx->priv_data;
1291

    
1292
    MPV_common_end(&r->s);
1293

    
1294
    av_freep(&r->intra_types_hist);
1295
    r->intra_types = NULL;
1296
    av_freep(&r->mb_type);
1297

    
1298
    return 0;
1299
}