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rv34.c
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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  *
12  * 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.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * RV30/40 decoder common data
25  */
26 
27 #include "libavutil/imgutils.h"
28 #include "libavutil/internal.h"
29 
30 #include "avcodec.h"
31 #include "error_resilience.h"
32 #include "mpegvideo.h"
33 #include "golomb.h"
34 #include "internal.h"
35 #include "mathops.h"
36 #include "rectangle.h"
37 #include "thread.h"
38 
39 #include "rv34vlc.h"
40 #include "rv34data.h"
41 #include "rv34.h"
42 
43 static inline void ZERO8x2(void* dst, int stride)
44 {
45  fill_rectangle(dst, 1, 2, stride, 0, 4);
46  fill_rectangle(((uint8_t*)(dst))+4, 1, 2, stride, 0, 4);
47 }
48 
49 /** translation of RV30/40 macroblock types to lavc ones */
50 static const int rv34_mb_type_to_lavc[12] = {
51  MB_TYPE_INTRA,
52  MB_TYPE_INTRA16x16 | MB_TYPE_SEPARATE_DC,
53  MB_TYPE_16x16 | MB_TYPE_L0,
54  MB_TYPE_8x8 | MB_TYPE_L0,
55  MB_TYPE_16x16 | MB_TYPE_L0,
56  MB_TYPE_16x16 | MB_TYPE_L1,
57  MB_TYPE_SKIP,
58  MB_TYPE_DIRECT2 | MB_TYPE_16x16,
59  MB_TYPE_16x8 | MB_TYPE_L0,
60  MB_TYPE_8x16 | MB_TYPE_L0,
61  MB_TYPE_16x16 | MB_TYPE_L0L1,
62  MB_TYPE_16x16 | MB_TYPE_L0 | MB_TYPE_SEPARATE_DC
63 };
64 
65 
66 static RV34VLC intra_vlcs[NUM_INTRA_TABLES], inter_vlcs[NUM_INTER_TABLES];
67 
68 static int rv34_decode_mv(RV34DecContext *r, int block_type);
69 
70 /**
71  * @name RV30/40 VLC generating functions
72  * @{
73  */
74 
75 static const int table_offs[] = {
76  0, 1818, 3622, 4144, 4698, 5234, 5804, 5868, 5900, 5932,
77  5996, 6252, 6316, 6348, 6380, 7674, 8944, 10274, 11668, 12250,
78  14060, 15846, 16372, 16962, 17512, 18148, 18180, 18212, 18244, 18308,
79  18564, 18628, 18660, 18692, 20036, 21314, 22648, 23968, 24614, 26384,
80  28190, 28736, 29366, 29938, 30608, 30640, 30672, 30704, 30768, 31024,
81  31088, 31120, 31184, 32570, 33898, 35236, 36644, 37286, 39020, 40802,
82  41368, 42052, 42692, 43348, 43380, 43412, 43444, 43476, 43604, 43668,
83  43700, 43732, 45100, 46430, 47778, 49160, 49802, 51550, 53340, 53972,
84  54648, 55348, 55994, 56122, 56154, 56186, 56218, 56346, 56410, 56442,
85  56474, 57878, 59290, 60636, 62036, 62682, 64460, 64524, 64588, 64716,
86  64844, 66076, 67466, 67978, 68542, 69064, 69648, 70296, 72010, 72074,
87  72138, 72202, 72330, 73572, 74936, 75454, 76030, 76566, 77176, 77822,
88  79582, 79646, 79678, 79742, 79870, 81180, 82536, 83064, 83672, 84242,
89  84934, 85576, 87384, 87448, 87480, 87544, 87672, 88982, 90340, 90902,
90  91598, 92182, 92846, 93488, 95246, 95278, 95310, 95374, 95502, 96878,
91  98266, 98848, 99542, 100234, 100884, 101524, 103320, 103352, 103384, 103416,
92  103480, 104874, 106222, 106910, 107584, 108258, 108902, 109544, 111366, 111398,
93  111430, 111462, 111494, 112878, 114320, 114988, 115660, 116310, 116950, 117592
94 };
95 
96 static VLC_TYPE table_data[117592][2];
97 
98 /**
99  * Generate VLC from codeword lengths.
100  * @param bits codeword lengths (zeroes are accepted)
101  * @param size length of input data
102  * @param vlc output VLC
103  * @param insyms symbols for input codes (NULL for default ones)
104  * @param num VLC table number (for static initialization)
105  */
106 static void rv34_gen_vlc(const uint8_t *bits, int size, VLC *vlc, const uint8_t *insyms,
107  const int num)
108 {
109  int i;
110  int counts[17] = {0}, codes[17];
111  uint16_t cw[MAX_VLC_SIZE], syms[MAX_VLC_SIZE];
112  uint8_t bits2[MAX_VLC_SIZE];
113  int maxbits = 0, realsize = 0;
114 
115  for(i = 0; i < size; i++){
116  if(bits[i]){
117  bits2[realsize] = bits[i];
118  syms[realsize] = insyms ? insyms[i] : i;
119  realsize++;
120  maxbits = FFMAX(maxbits, bits[i]);
121  counts[bits[i]]++;
122  }
123  }
124 
125  codes[0] = 0;
126  for(i = 0; i < 16; i++)
127  codes[i+1] = (codes[i] + counts[i]) << 1;
128  for(i = 0; i < realsize; i++)
129  cw[i] = codes[bits2[i]]++;
130 
131  vlc->table = &table_data[table_offs[num]];
132  vlc->table_allocated = table_offs[num + 1] - table_offs[num];
133  ff_init_vlc_sparse(vlc, FFMIN(maxbits, 9), realsize,
134  bits2, 1, 1,
135  cw, 2, 2,
136  syms, 2, 2, INIT_VLC_USE_NEW_STATIC);
137 }
138 
139 /**
140  * Initialize all tables.
141  */
142 static av_cold void rv34_init_tables(void)
143 {
144  int i, j, k;
145 
146  for(i = 0; i < NUM_INTRA_TABLES; i++){
147  for(j = 0; j < 2; j++){
148  rv34_gen_vlc(rv34_table_intra_cbppat [i][j], CBPPAT_VLC_SIZE, &intra_vlcs[i].cbppattern[j], NULL, 19*i + 0 + j);
149  rv34_gen_vlc(rv34_table_intra_secondpat[i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].second_pattern[j], NULL, 19*i + 2 + j);
150  rv34_gen_vlc(rv34_table_intra_thirdpat [i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].third_pattern[j], NULL, 19*i + 4 + j);
151  for(k = 0; k < 4; k++){
152  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);
153  }
154  }
155  for(j = 0; j < 4; j++){
156  rv34_gen_vlc(rv34_table_intra_firstpat[i][j], FIRSTBLK_VLC_SIZE, &intra_vlcs[i].first_pattern[j], NULL, 19*i + 14 + j);
157  }
158  rv34_gen_vlc(rv34_intra_coeff[i], COEFF_VLC_SIZE, &intra_vlcs[i].coefficient, NULL, 19*i + 18);
159  }
160 
161  for(i = 0; i < NUM_INTER_TABLES; i++){
162  rv34_gen_vlc(rv34_inter_cbppat[i], CBPPAT_VLC_SIZE, &inter_vlcs[i].cbppattern[0], NULL, i*12 + 95);
163  for(j = 0; j < 4; j++){
164  rv34_gen_vlc(rv34_inter_cbp[i][j], CBP_VLC_SIZE, &inter_vlcs[i].cbp[0][j], rv34_cbp_code, i*12 + 96 + j);
165  }
166  for(j = 0; j < 2; j++){
167  rv34_gen_vlc(rv34_table_inter_firstpat [i][j], FIRSTBLK_VLC_SIZE, &inter_vlcs[i].first_pattern[j], NULL, i*12 + 100 + j);
168  rv34_gen_vlc(rv34_table_inter_secondpat[i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].second_pattern[j], NULL, i*12 + 102 + j);
169  rv34_gen_vlc(rv34_table_inter_thirdpat [i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].third_pattern[j], NULL, i*12 + 104 + j);
170  }
171  rv34_gen_vlc(rv34_inter_coeff[i], COEFF_VLC_SIZE, &inter_vlcs[i].coefficient, NULL, i*12 + 106);
172  }
173 }
174 
175 /** @} */ // vlc group
176 
177 /**
178  * @name RV30/40 4x4 block decoding functions
179  * @{
180  */
181 
182 /**
183  * Decode coded block pattern.
184  */
185 static int rv34_decode_cbp(GetBitContext *gb, RV34VLC *vlc, int table)
186 {
187  int pattern, code, cbp=0;
188  int ones;
189  static const int cbp_masks[3] = {0x100000, 0x010000, 0x110000};
190  static const int shifts[4] = { 0, 2, 8, 10 };
191  const int *curshift = shifts;
192  int i, t, mask;
193 
194  code = get_vlc2(gb, vlc->cbppattern[table].table, 9, 2);
195  pattern = code & 0xF;
196  code >>= 4;
197 
198  ones = rv34_count_ones[pattern];
199 
200  for(mask = 8; mask; mask >>= 1, curshift++){
201  if(pattern & mask)
202  cbp |= get_vlc2(gb, vlc->cbp[table][ones].table, vlc->cbp[table][ones].bits, 1) << curshift[0];
203  }
204 
205  for(i = 0; i < 4; i++){
206  t = (modulo_three_table[code] >> (6 - 2*i)) & 3;
207  if(t == 1)
208  cbp |= cbp_masks[get_bits1(gb)] << i;
209  if(t == 2)
210  cbp |= cbp_masks[2] << i;
211  }
212  return cbp;
213 }
214 
215 /**
216  * Get one coefficient value from the bitstream and store it.
217  */
218 static inline void decode_coeff(int16_t *dst, int coef, int esc, GetBitContext *gb, VLC* vlc, int q)
219 {
220  if(coef){
221  if(coef == esc){
222  coef = get_vlc2(gb, vlc->table, 9, 2);
223  if(coef > 23){
224  coef -= 23;
225  coef = 22 + ((1 << coef) | get_bits(gb, coef));
226  }
227  coef += esc;
228  }
229  if(get_bits1(gb))
230  coef = -coef;
231  *dst = (coef*q + 8) >> 4;
232  }
233 }
234 
235 /**
236  * Decode 2x2 subblock of coefficients.
237  */
238 static inline void decode_subblock(int16_t *dst, int code, const int is_block2, GetBitContext *gb, VLC *vlc, int q)
239 {
240  int flags = modulo_three_table[code];
241 
242  decode_coeff( dst+0*4+0, (flags >> 6) , 3, gb, vlc, q);
243  if(is_block2){
244  decode_coeff(dst+1*4+0, (flags >> 4) & 3, 2, gb, vlc, q);
245  decode_coeff(dst+0*4+1, (flags >> 2) & 3, 2, gb, vlc, q);
246  }else{
247  decode_coeff(dst+0*4+1, (flags >> 4) & 3, 2, gb, vlc, q);
248  decode_coeff(dst+1*4+0, (flags >> 2) & 3, 2, gb, vlc, q);
249  }
250  decode_coeff( dst+1*4+1, (flags >> 0) & 3, 2, gb, vlc, q);
251 }
252 
253 /**
254  * Decode a single coefficient.
255  */
256 static inline void decode_subblock1(int16_t *dst, int code, GetBitContext *gb, VLC *vlc, int q)
257 {
258  int coeff = modulo_three_table[code] >> 6;
259  decode_coeff(dst, coeff, 3, gb, vlc, q);
260 }
261 
262 static inline void decode_subblock3(int16_t *dst, int code, GetBitContext *gb, VLC *vlc,
263  int q_dc, int q_ac1, int q_ac2)
264 {
265  int flags = modulo_three_table[code];
266 
267  decode_coeff(dst+0*4+0, (flags >> 6) , 3, gb, vlc, q_dc);
268  decode_coeff(dst+0*4+1, (flags >> 4) & 3, 2, gb, vlc, q_ac1);
269  decode_coeff(dst+1*4+0, (flags >> 2) & 3, 2, gb, vlc, q_ac1);
270  decode_coeff(dst+1*4+1, (flags >> 0) & 3, 2, gb, vlc, q_ac2);
271 }
272 
273 /**
274  * Decode coefficients for 4x4 block.
275  *
276  * This is done by filling 2x2 subblocks with decoded coefficients
277  * in this order (the same for subblocks and subblock coefficients):
278  * o--o
279  * /
280  * /
281  * o--o
282  */
283 
284 static int rv34_decode_block(int16_t *dst, GetBitContext *gb, RV34VLC *rvlc, int fc, int sc, int q_dc, int q_ac1, int q_ac2)
285 {
286  int code, pattern, has_ac = 1;
287 
288  code = get_vlc2(gb, rvlc->first_pattern[fc].table, 9, 2);
289 
290  pattern = code & 0x7;
291 
292  code >>= 3;
293 
294  if (modulo_three_table[code] & 0x3F) {
295  decode_subblock3(dst, code, gb, &rvlc->coefficient, q_dc, q_ac1, q_ac2);
296  } else {
297  decode_subblock1(dst, code, gb, &rvlc->coefficient, q_dc);
298  if (!pattern)
299  return 0;
300  has_ac = 0;
301  }
302 
303  if(pattern & 4){
304  code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);
305  decode_subblock(dst + 4*0+2, code, 0, gb, &rvlc->coefficient, q_ac2);
306  }
307  if(pattern & 2){ // Looks like coefficients 1 and 2 are swapped for this block
308  code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);
309  decode_subblock(dst + 4*2+0, code, 1, gb, &rvlc->coefficient, q_ac2);
310  }
311  if(pattern & 1){
312  code = get_vlc2(gb, rvlc->third_pattern[sc].table, 9, 2);
313  decode_subblock(dst + 4*2+2, code, 0, gb, &rvlc->coefficient, q_ac2);
314  }
315  return has_ac | pattern;
316 }
317 
318 /**
319  * @name RV30/40 bitstream parsing
320  * @{
321  */
322 
323 /**
324  * Decode starting slice position.
325  * @todo Maybe replace with ff_h263_decode_mba() ?
326  */
327 int ff_rv34_get_start_offset(GetBitContext *gb, int mb_size)
328 {
329  int i;
330  for(i = 0; i < 5; i++)
331  if(rv34_mb_max_sizes[i] >= mb_size - 1)
332  break;
333  return rv34_mb_bits_sizes[i];
334 }
335 
336 /**
337  * Select VLC set for decoding from current quantizer, modifier and frame type.
338  */
339 static inline RV34VLC* choose_vlc_set(int quant, int mod, int type)
340 {
341  if(mod == 2 && quant < 19) quant += 10;
342  else if(mod && quant < 26) quant += 5;
343  return type ? &inter_vlcs[rv34_quant_to_vlc_set[1][av_clip(quant, 0, 30)]]
344  : &intra_vlcs[rv34_quant_to_vlc_set[0][av_clip(quant, 0, 30)]];
345 }
346 
347 /**
348  * Decode intra macroblock header and return CBP in case of success, -1 otherwise.
349  */
350 static int rv34_decode_intra_mb_header(RV34DecContext *r, int8_t *intra_types)
351 {
352  MpegEncContext *s = &r->s;
353  GetBitContext *gb = &s->gb;
354  int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
355  int t;
356 
357  r->is16 = get_bits1(gb);
358  if(r->is16){
359  s->current_picture_ptr->mb_type[mb_pos] = MB_TYPE_INTRA16x16;
360  r->block_type = RV34_MB_TYPE_INTRA16x16;
361  t = get_bits(gb, 2);
362  fill_rectangle(intra_types, 4, 4, r->intra_types_stride, t, sizeof(intra_types[0]));
363  r->luma_vlc = 2;
364  }else{
365  if(!r->rv30){
366  if(!get_bits1(gb))
367  av_log(s->avctx, AV_LOG_ERROR, "Need DQUANT\n");
368  }
369  s->current_picture_ptr->mb_type[mb_pos] = MB_TYPE_INTRA;
370  r->block_type = RV34_MB_TYPE_INTRA;
371  if(r->decode_intra_types(r, gb, intra_types) < 0)
372  return -1;
373  r->luma_vlc = 1;
374  }
375 
376  r->chroma_vlc = 0;
377  r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
378 
379  return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);
380 }
381 
382 /**
383  * Decode inter macroblock header and return CBP in case of success, -1 otherwise.
384  */
385 static int rv34_decode_inter_mb_header(RV34DecContext *r, int8_t *intra_types)
386 {
387  MpegEncContext *s = &r->s;
388  GetBitContext *gb = &s->gb;
389  int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
390  int i, t;
391 
392  r->block_type = r->decode_mb_info(r);
393  if(r->block_type == -1)
394  return -1;
395  s->current_picture_ptr->mb_type[mb_pos] = rv34_mb_type_to_lavc[r->block_type];
396  r->mb_type[mb_pos] = r->block_type;
397  if(r->block_type == RV34_MB_SKIP){
398  if(s->pict_type == AV_PICTURE_TYPE_P)
399  r->mb_type[mb_pos] = RV34_MB_P_16x16;
400  if(s->pict_type == AV_PICTURE_TYPE_B)
401  r->mb_type[mb_pos] = RV34_MB_B_DIRECT;
402  }
403  r->is16 = !!IS_INTRA16x16(s->current_picture_ptr->mb_type[mb_pos]);
404  rv34_decode_mv(r, r->block_type);
405  if(r->block_type == RV34_MB_SKIP){
406  fill_rectangle(intra_types, 4, 4, r->intra_types_stride, 0, sizeof(intra_types[0]));
407  return 0;
408  }
409  r->chroma_vlc = 1;
410  r->luma_vlc = 0;
411 
412  if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){
413  if(r->is16){
414  t = get_bits(gb, 2);
415  fill_rectangle(intra_types, 4, 4, r->intra_types_stride, t, sizeof(intra_types[0]));
416  r->luma_vlc = 2;
417  }else{
418  if(r->decode_intra_types(r, gb, intra_types) < 0)
419  return -1;
420  r->luma_vlc = 1;
421  }
422  r->chroma_vlc = 0;
423  r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
424  }else{
425  for(i = 0; i < 16; i++)
426  intra_types[(i & 3) + (i>>2) * r->intra_types_stride] = 0;
427  r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);
428  if(r->mb_type[mb_pos] == RV34_MB_P_MIX16x16){
429  r->is16 = 1;
430  r->chroma_vlc = 1;
431  r->luma_vlc = 2;
432  r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
433  }
434  }
435 
436  return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);
437 }
438 
439 /** @} */ //bitstream functions
440 
441 /**
442  * @name motion vector related code (prediction, reconstruction, motion compensation)
443  * @{
444  */
445 
446 /** macroblock partition width in 8x8 blocks */
447 static const uint8_t part_sizes_w[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 2 };
448 
449 /** macroblock partition height in 8x8 blocks */
450 static const uint8_t part_sizes_h[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2 };
451 
452 /** availability index for subblocks */
453 static const uint8_t avail_indexes[4] = { 6, 7, 10, 11 };
454 
455 /**
456  * motion vector prediction
457  *
458  * Motion prediction performed for the block by using median prediction of
459  * motion vectors from the left, top and right top blocks but in corner cases
460  * some other vectors may be used instead.
461  */
462 static void rv34_pred_mv(RV34DecContext *r, int block_type, int subblock_no, int dmv_no)
463 {
464  MpegEncContext *s = &r->s;
465  int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
466  int A[2] = {0}, B[2], C[2];
467  int i, j;
468  int mx, my;
469  int* avail = r->avail_cache + avail_indexes[subblock_no];
470  int c_off = part_sizes_w[block_type];
471 
472  mv_pos += (subblock_no & 1) + (subblock_no >> 1)*s->b8_stride;
473  if(subblock_no == 3)
474  c_off = -1;
475 
476  if(avail[-1]){
477  A[0] = s->current_picture_ptr->motion_val[0][mv_pos-1][0];
478  A[1] = s->current_picture_ptr->motion_val[0][mv_pos-1][1];
479  }
480  if(avail[-4]){
481  B[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][0];
482  B[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][1];
483  }else{
484  B[0] = A[0];
485  B[1] = A[1];
486  }
487  if(!avail[c_off-4]){
488  if(avail[-4] && (avail[-1] || r->rv30)){
489  C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][0];
490  C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][1];
491  }else{
492  C[0] = A[0];
493  C[1] = A[1];
494  }
495  }else{
496  C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+c_off][0];
497  C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+c_off][1];
498  }
499  mx = mid_pred(A[0], B[0], C[0]);
500  my = mid_pred(A[1], B[1], C[1]);
501  mx += r->dmv[dmv_no][0];
502  my += r->dmv[dmv_no][1];
503  for(j = 0; j < part_sizes_h[block_type]; j++){
504  for(i = 0; i < part_sizes_w[block_type]; i++){
505  s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][0] = mx;
506  s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][1] = my;
507  }
508  }
509 }
510 
511 #define GET_PTS_DIFF(a, b) ((a - b + 8192) & 0x1FFF)
512 
513 /**
514  * Calculate motion vector component that should be added for direct blocks.
515  */
516 static int calc_add_mv(RV34DecContext *r, int dir, int val)
517 {
518  int mul = dir ? -r->mv_weight2 : r->mv_weight1;
519 
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] = { 0 }, B[2] = { 0 }, C[2] = { 0 };
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  if((r->avail_cache[6-1] & type) & mask){
560  A[0] = cur_pic->motion_val[dir][mv_pos - 1][0];
561  A[1] = cur_pic->motion_val[dir][mv_pos - 1][1];
562  has_A = 1;
563  }
564  if((r->avail_cache[6-4] & type) & mask){
565  B[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][0];
566  B[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][1];
567  has_B = 1;
568  }
569  if(r->avail_cache[6-4] && (r->avail_cache[6-2] & type) & mask){
570  C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][0];
571  C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][1];
572  has_C = 1;
573  }else if((s->mb_x+1) == s->mb_width && (r->avail_cache[6-5] & type) & mask){
574  C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride - 1][0];
575  C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride - 1][1];
576  has_C = 1;
577  }
578 
579  rv34_pred_b_vector(A, B, C, has_A, has_B, has_C, &mx, &my);
580 
581  mx += r->dmv[dir][0];
582  my += r->dmv[dir][1];
583 
584  for(j = 0; j < 2; j++){
585  for(i = 0; i < 2; i++){
586  cur_pic->motion_val[dir][mv_pos + i + j*s->b8_stride][0] = mx;
587  cur_pic->motion_val[dir][mv_pos + i + j*s->b8_stride][1] = my;
588  }
589  }
590  if(block_type == RV34_MB_B_BACKWARD || block_type == RV34_MB_B_FORWARD){
591  ZERO8x2(cur_pic->motion_val[!dir][mv_pos], s->b8_stride);
592  }
593 }
594 
595 /**
596  * motion vector prediction - RV3 version
597  */
598 static void rv34_pred_mv_rv3(RV34DecContext *r, int block_type, int dir)
599 {
600  MpegEncContext *s = &r->s;
601  int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
602  int A[2] = {0}, B[2], C[2];
603  int i, j, k;
604  int mx, my;
605  int* avail = r->avail_cache + avail_indexes[0];
606 
607  if(avail[-1]){
608  A[0] = s->current_picture_ptr->motion_val[0][mv_pos - 1][0];
609  A[1] = s->current_picture_ptr->motion_val[0][mv_pos - 1][1];
610  }
611  if(avail[-4]){
612  B[0] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride][0];
613  B[1] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride][1];
614  }else{
615  B[0] = A[0];
616  B[1] = A[1];
617  }
618  if(!avail[-4 + 2]){
619  if(avail[-4] && (avail[-1])){
620  C[0] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride - 1][0];
621  C[1] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride - 1][1];
622  }else{
623  C[0] = A[0];
624  C[1] = A[1];
625  }
626  }else{
627  C[0] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride + 2][0];
628  C[1] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride + 2][1];
629  }
630  mx = mid_pred(A[0], B[0], C[0]);
631  my = mid_pred(A[1], B[1], C[1]);
632  mx += r->dmv[0][0];
633  my += r->dmv[0][1];
634  for(j = 0; j < 2; j++){
635  for(i = 0; i < 2; i++){
636  for(k = 0; k < 2; k++){
637  s->current_picture_ptr->motion_val[k][mv_pos + i + j*s->b8_stride][0] = mx;
638  s->current_picture_ptr->motion_val[k][mv_pos + i + j*s->b8_stride][1] = my;
639  }
640  }
641  }
642 }
643 
644 static const int chroma_coeffs[3] = { 0, 3, 5 };
645 
646 /**
647  * generic motion compensation function
648  *
649  * @param r decoder context
650  * @param block_type type of the current block
651  * @param xoff horizontal offset from the start of the current block
652  * @param yoff vertical offset from the start of the current block
653  * @param mv_off offset to the motion vector information
654  * @param width width of the current partition in 8x8 blocks
655  * @param height height of the current partition in 8x8 blocks
656  * @param dir motion compensation direction (i.e. from the last or the next reference frame)
657  * @param thirdpel motion vectors are specified in 1/3 of pixel
658  * @param qpel_mc a set of functions used to perform luma motion compensation
659  * @param chroma_mc a set of functions used to perform chroma motion compensation
660  */
661 static inline void rv34_mc(RV34DecContext *r, const int block_type,
662  const int xoff, const int yoff, int mv_off,
663  const int width, const int height, int dir,
664  const int thirdpel, int weighted,
665  qpel_mc_func (*qpel_mc)[16],
666  h264_chroma_mc_func (*chroma_mc))
667 {
668  MpegEncContext *s = &r->s;
669  uint8_t *Y, *U, *V, *srcY, *srcU, *srcV;
670  int dxy, mx, my, umx, umy, lx, ly, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;
671  int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride + mv_off;
672  int is16x16 = 1;
673 
674  if(thirdpel){
675  int chroma_mx, chroma_my;
676  mx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + (3 << 24)) / 3 - (1 << 24);
677  my = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + (3 << 24)) / 3 - (1 << 24);
678  lx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + (3 << 24)) % 3;
679  ly = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + (3 << 24)) % 3;
680  chroma_mx = s->current_picture_ptr->motion_val[dir][mv_pos][0] / 2;
681  chroma_my = s->current_picture_ptr->motion_val[dir][mv_pos][1] / 2;
682  umx = (chroma_mx + (3 << 24)) / 3 - (1 << 24);
683  umy = (chroma_my + (3 << 24)) / 3 - (1 << 24);
684  uvmx = chroma_coeffs[(chroma_mx + (3 << 24)) % 3];
685  uvmy = chroma_coeffs[(chroma_my + (3 << 24)) % 3];
686  }else{
687  int cx, cy;
688  mx = s->current_picture_ptr->motion_val[dir][mv_pos][0] >> 2;
689  my = s->current_picture_ptr->motion_val[dir][mv_pos][1] >> 2;
690  lx = s->current_picture_ptr->motion_val[dir][mv_pos][0] & 3;
691  ly = s->current_picture_ptr->motion_val[dir][mv_pos][1] & 3;
692  cx = s->current_picture_ptr->motion_val[dir][mv_pos][0] / 2;
693  cy = s->current_picture_ptr->motion_val[dir][mv_pos][1] / 2;
694  umx = cx >> 2;
695  umy = cy >> 2;
696  uvmx = (cx & 3) << 1;
697  uvmy = (cy & 3) << 1;
698  //due to some flaw RV40 uses the same MC compensation routine for H2V2 and H3V3
699  if(uvmx == 6 && uvmy == 6)
700  uvmx = uvmy = 4;
701  }
702 
703  if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME)) {
704  /* wait for the referenced mb row to be finished */
705  int mb_row = s->mb_y + ((yoff + my + 5 + 8 * height) >> 4);
706  ThreadFrame *f = dir ? &s->next_picture_ptr->tf : &s->last_picture_ptr->tf;
707  ff_thread_await_progress(f, mb_row, 0);
708  }
709 
710  dxy = ly*4 + lx;
711  srcY = dir ? s->next_picture_ptr->f.data[0] : s->last_picture_ptr->f.data[0];
712  srcU = dir ? s->next_picture_ptr->f.data[1] : s->last_picture_ptr->f.data[1];
713  srcV = dir ? s->next_picture_ptr->f.data[2] : s->last_picture_ptr->f.data[2];
714  src_x = s->mb_x * 16 + xoff + mx;
715  src_y = s->mb_y * 16 + yoff + my;
716  uvsrc_x = s->mb_x * 8 + (xoff >> 1) + umx;
717  uvsrc_y = s->mb_y * 8 + (yoff >> 1) + umy;
718  srcY += src_y * s->linesize + src_x;
719  srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
720  srcV += uvsrc_y * s->uvlinesize + uvsrc_x;
721  if(s->h_edge_pos - (width << 3) < 6 || s->v_edge_pos - (height << 3) < 6 ||
722  (unsigned)(src_x - !!lx*2) > s->h_edge_pos - !!lx*2 - (width <<3) - 4 ||
723  (unsigned)(src_y - !!ly*2) > s->v_edge_pos - !!ly*2 - (height<<3) - 4) {
724  uint8_t *uvbuf = s->edge_emu_buffer + 22 * s->linesize;
725 
726  srcY -= 2 + 2*s->linesize;
727  s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,
728  s->linesize, s->linesize,
729  (width << 3) + 6, (height << 3) + 6,
730  src_x - 2, src_y - 2,
731  s->h_edge_pos, s->v_edge_pos);
732  srcY = s->edge_emu_buffer + 2 + 2*s->linesize;
733  s->vdsp.emulated_edge_mc(uvbuf, srcU,
734  s->uvlinesize, s->uvlinesize,
735  (width << 2) + 1, (height << 2) + 1,
736  uvsrc_x, uvsrc_y,
737  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
738  s->vdsp.emulated_edge_mc(uvbuf + 16, srcV,
739  s->uvlinesize, s->uvlinesize,
740  (width << 2) + 1, (height << 2) + 1,
741  uvsrc_x, uvsrc_y,
742  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
743  srcU = uvbuf;
744  srcV = uvbuf + 16;
745  }
746  if(!weighted){
747  Y = s->dest[0] + xoff + yoff *s->linesize;
748  U = s->dest[1] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
749  V = s->dest[2] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
750  }else{
751  Y = r->tmp_b_block_y [dir] + xoff + yoff *s->linesize;
752  U = r->tmp_b_block_uv[dir*2] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
753  V = r->tmp_b_block_uv[dir*2+1] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
754  }
755 
756  if(block_type == RV34_MB_P_16x8){
757  qpel_mc[1][dxy](Y, srcY, s->linesize);
758  Y += 8;
759  srcY += 8;
760  }else if(block_type == RV34_MB_P_8x16){
761  qpel_mc[1][dxy](Y, srcY, s->linesize);
762  Y += 8 * s->linesize;
763  srcY += 8 * s->linesize;
764  }
765  is16x16 = (block_type != RV34_MB_P_8x8) && (block_type != RV34_MB_P_16x8) && (block_type != RV34_MB_P_8x16);
766  qpel_mc[!is16x16][dxy](Y, srcY, s->linesize);
767  chroma_mc[2-width] (U, srcU, s->uvlinesize, height*4, uvmx, uvmy);
768  chroma_mc[2-width] (V, srcV, s->uvlinesize, height*4, uvmx, uvmy);
769 }
770 
771 static void rv34_mc_1mv(RV34DecContext *r, const int block_type,
772  const int xoff, const int yoff, int mv_off,
773  const int width, const int height, int dir)
774 {
775  rv34_mc(r, block_type, xoff, yoff, mv_off, width, height, dir, r->rv30, 0,
776  r->rdsp.put_pixels_tab,
777  r->rdsp.put_chroma_pixels_tab);
778 }
779 
780 static void rv4_weight(RV34DecContext *r)
781 {
782  r->rdsp.rv40_weight_pixels_tab[r->scaled_weight][0](r->s.dest[0],
783  r->tmp_b_block_y[0],
784  r->tmp_b_block_y[1],
785  r->weight1,
786  r->weight2,
787  r->s.linesize);
788  r->rdsp.rv40_weight_pixels_tab[r->scaled_weight][1](r->s.dest[1],
789  r->tmp_b_block_uv[0],
790  r->tmp_b_block_uv[2],
791  r->weight1,
792  r->weight2,
793  r->s.uvlinesize);
794  r->rdsp.rv40_weight_pixels_tab[r->scaled_weight][1](r->s.dest[2],
795  r->tmp_b_block_uv[1],
796  r->tmp_b_block_uv[3],
797  r->weight1,
798  r->weight2,
799  r->s.uvlinesize);
800 }
801 
802 static void rv34_mc_2mv(RV34DecContext *r, const int block_type)
803 {
804  int weighted = !r->rv30 && block_type != RV34_MB_B_BIDIR && r->weight1 != 8192;
805 
806  rv34_mc(r, block_type, 0, 0, 0, 2, 2, 0, r->rv30, weighted,
807  r->rdsp.put_pixels_tab,
808  r->rdsp.put_chroma_pixels_tab);
809  if(!weighted){
810  rv34_mc(r, block_type, 0, 0, 0, 2, 2, 1, r->rv30, 0,
811  r->rdsp.avg_pixels_tab,
812  r->rdsp.avg_chroma_pixels_tab);
813  }else{
814  rv34_mc(r, block_type, 0, 0, 0, 2, 2, 1, r->rv30, 1,
815  r->rdsp.put_pixels_tab,
816  r->rdsp.put_chroma_pixels_tab);
817  rv4_weight(r);
818  }
819 }
820 
821 static void rv34_mc_2mv_skip(RV34DecContext *r)
822 {
823  int i, j;
824  int weighted = !r->rv30 && r->weight1 != 8192;
825 
826  for(j = 0; j < 2; j++)
827  for(i = 0; i < 2; i++){
828  rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 0, r->rv30,
829  weighted,
830  r->rdsp.put_pixels_tab,
831  r->rdsp.put_chroma_pixels_tab);
832  rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 1, r->rv30,
833  weighted,
834  weighted ? r->rdsp.put_pixels_tab : r->rdsp.avg_pixels_tab,
835  weighted ? r->rdsp.put_chroma_pixels_tab : r->rdsp.avg_chroma_pixels_tab);
836  }
837  if(weighted)
838  rv4_weight(r);
839 }
840 
841 /** number of motion vectors in each macroblock type */
842 static const int num_mvs[RV34_MB_TYPES] = { 0, 0, 1, 4, 1, 1, 0, 0, 2, 2, 2, 1 };
843 
844 /**
845  * Decode motion vector differences
846  * and perform motion vector reconstruction and motion compensation.
847  */
848 static int rv34_decode_mv(RV34DecContext *r, int block_type)
849 {
850  MpegEncContext *s = &r->s;
851  GetBitContext *gb = &s->gb;
852  int i, j, k, l;
853  int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
854  int next_bt;
855 
856  memset(r->dmv, 0, sizeof(r->dmv));
857  for(i = 0; i < num_mvs[block_type]; i++){
858  r->dmv[i][0] = svq3_get_se_golomb(gb);
859  r->dmv[i][1] = svq3_get_se_golomb(gb);
860  }
861  switch(block_type){
862  case RV34_MB_TYPE_INTRA:
863  case RV34_MB_TYPE_INTRA16x16:
864  ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
865  return 0;
866  case RV34_MB_SKIP:
867  if(s->pict_type == AV_PICTURE_TYPE_P){
868  ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
869  rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);
870  break;
871  }
872  case RV34_MB_B_DIRECT:
873  //surprisingly, it uses motion scheme from next reference frame
874  /* wait for the current mb row to be finished */
875  if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))
876  ff_thread_await_progress(&s->next_picture_ptr->tf, FFMAX(0, s->mb_y-1), 0);
877 
878  next_bt = s->next_picture_ptr->mb_type[s->mb_x + s->mb_y * s->mb_stride];
879  if(IS_INTRA(next_bt) || IS_SKIP(next_bt)){
880  ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
881  ZERO8x2(s->current_picture_ptr->motion_val[1][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
882  }else
883  for(j = 0; j < 2; j++)
884  for(i = 0; i < 2; i++)
885  for(k = 0; k < 2; k++)
886  for(l = 0; l < 2; l++)
887  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]);
888  if(!(IS_16X8(next_bt) || IS_8X16(next_bt) || IS_8X8(next_bt))) //we can use whole macroblock MC
889  rv34_mc_2mv(r, block_type);
890  else
891  rv34_mc_2mv_skip(r);
892  ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
893  break;
894  case RV34_MB_P_16x16:
895  case RV34_MB_P_MIX16x16:
896  rv34_pred_mv(r, block_type, 0, 0);
897  rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);
898  break;
899  case RV34_MB_B_FORWARD:
900  case RV34_MB_B_BACKWARD:
901  r->dmv[1][0] = r->dmv[0][0];
902  r->dmv[1][1] = r->dmv[0][1];
903  if(r->rv30)
904  rv34_pred_mv_rv3(r, block_type, block_type == RV34_MB_B_BACKWARD);
905  else
906  rv34_pred_mv_b (r, block_type, block_type == RV34_MB_B_BACKWARD);
907  rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, block_type == RV34_MB_B_BACKWARD);
908  break;
909  case RV34_MB_P_16x8:
910  case RV34_MB_P_8x16:
911  rv34_pred_mv(r, block_type, 0, 0);
912  rv34_pred_mv(r, block_type, 1 + (block_type == RV34_MB_P_16x8), 1);
913  if(block_type == RV34_MB_P_16x8){
914  rv34_mc_1mv(r, block_type, 0, 0, 0, 2, 1, 0);
915  rv34_mc_1mv(r, block_type, 0, 8, s->b8_stride, 2, 1, 0);
916  }
917  if(block_type == RV34_MB_P_8x16){
918  rv34_mc_1mv(r, block_type, 0, 0, 0, 1, 2, 0);
919  rv34_mc_1mv(r, block_type, 8, 0, 1, 1, 2, 0);
920  }
921  break;
922  case RV34_MB_B_BIDIR:
923  rv34_pred_mv_b (r, block_type, 0);
924  rv34_pred_mv_b (r, block_type, 1);
925  rv34_mc_2mv (r, block_type);
926  break;
927  case RV34_MB_P_8x8:
928  for(i=0;i< 4;i++){
929  rv34_pred_mv(r, block_type, i, i);
930  rv34_mc_1mv (r, block_type, (i&1)<<3, (i&2)<<2, (i&1)+(i>>1)*s->b8_stride, 1, 1, 0);
931  }
932  break;
933  }
934 
935  return 0;
936 }
937 /** @} */ // mv group
938 
939 /**
940  * @name Macroblock reconstruction functions
941  * @{
942  */
943 /** mapping of RV30/40 intra prediction types to standard H.264 types */
944 static const int ittrans[9] = {
945  DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,
946  VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,
947 };
948 
949 /** mapping of RV30/40 intra 16x16 prediction types to standard H.264 types */
950 static const int ittrans16[4] = {
951  DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,
952 };
953 
954 /**
955  * Perform 4x4 intra prediction.
956  */
957 static void rv34_pred_4x4_block(RV34DecContext *r, uint8_t *dst, int stride, int itype, int up, int left, int down, int right)
958 {
959  uint8_t *prev = dst - stride + 4;
960  uint32_t topleft;
961 
962  if(!up && !left)
963  itype = DC_128_PRED;
964  else if(!up){
965  if(itype == VERT_PRED) itype = HOR_PRED;
966  if(itype == DC_PRED) itype = LEFT_DC_PRED;
967  }else if(!left){
968  if(itype == HOR_PRED) itype = VERT_PRED;
969  if(itype == DC_PRED) itype = TOP_DC_PRED;
970  if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;
971  }
972  if(!down){
973  if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;
974  if(itype == HOR_UP_PRED) itype = HOR_UP_PRED_RV40_NODOWN;
975  if(itype == VERT_LEFT_PRED) itype = VERT_LEFT_PRED_RV40_NODOWN;
976  }
977  if(!right && up){
978  topleft = dst[-stride + 3] * 0x01010101u;
979  prev = (uint8_t*)&topleft;
980  }
981  r->h.pred4x4[itype](dst, prev, stride);
982 }
983 
984 static inline int adjust_pred16(int itype, int up, int left)
985 {
986  if(!up && !left)
987  itype = DC_128_PRED8x8;
988  else if(!up){
989  if(itype == PLANE_PRED8x8)itype = HOR_PRED8x8;
990  if(itype == VERT_PRED8x8) itype = HOR_PRED8x8;
991  if(itype == DC_PRED8x8) itype = LEFT_DC_PRED8x8;
992  }else if(!left){
993  if(itype == PLANE_PRED8x8)itype = VERT_PRED8x8;
994  if(itype == HOR_PRED8x8) itype = VERT_PRED8x8;
995  if(itype == DC_PRED8x8) itype = TOP_DC_PRED8x8;
996  }
997  return itype;
998 }
999 
1000 static inline void rv34_process_block(RV34DecContext *r,
1001  uint8_t *pdst, int stride,
1002  int fc, int sc, int q_dc, int q_ac)
1003 {
1004  MpegEncContext *s = &r->s;
1005  int16_t *ptr = s->block[0];
1006  int has_ac = rv34_decode_block(ptr, &s->gb, r->cur_vlcs,
1007  fc, sc, q_dc, q_ac, q_ac);
1008  if(has_ac){
1009  r->rdsp.rv34_idct_add(pdst, stride, ptr);
1010  }else{
1011  r->rdsp.rv34_idct_dc_add(pdst, stride, ptr[0]);
1012  ptr[0] = 0;
1013  }
1014 }
1015 
1016 static void rv34_output_i16x16(RV34DecContext *r, int8_t *intra_types, int cbp)
1017 {
1018  LOCAL_ALIGNED_16(int16_t, block16, [16]);
1019  MpegEncContext *s = &r->s;
1020  GetBitContext *gb = &s->gb;
1021  int q_dc = rv34_qscale_tab[ r->luma_dc_quant_i[s->qscale] ],
1022  q_ac = rv34_qscale_tab[s->qscale];
1023  uint8_t *dst = s->dest[0];
1024  int16_t *ptr = s->block[0];
1025  int i, j, itype, has_ac;
1026 
1027  memset(block16, 0, 16 * sizeof(*block16));
1028 
1029  has_ac = rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0, q_dc, q_dc, q_ac);
1030  if(has_ac)
1031  r->rdsp.rv34_inv_transform(block16);
1032  else
1033  r->rdsp.rv34_inv_transform_dc(block16);
1034 
1035  itype = ittrans16[intra_types[0]];
1036  itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);
1037  r->h.pred16x16[itype](dst, s->linesize);
1038 
1039  for(j = 0; j < 4; j++){
1040  for(i = 0; i < 4; i++, cbp >>= 1){
1041  int dc = block16[i + j*4];
1042 
1043  if(cbp & 1){
1044  has_ac = rv34_decode_block(ptr, gb, r->cur_vlcs, r->luma_vlc, 0, q_ac, q_ac, q_ac);
1045  }else
1046  has_ac = 0;
1047 
1048  if(has_ac){
1049  ptr[0] = dc;
1050  r->rdsp.rv34_idct_add(dst+4*i, s->linesize, ptr);
1051  }else
1052  r->rdsp.rv34_idct_dc_add(dst+4*i, s->linesize, dc);
1053  }
1054 
1055  dst += 4*s->linesize;
1056  }
1057 
1058  itype = ittrans16[intra_types[0]];
1059  if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;
1060  itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);
1061 
1062  q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];
1063  q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];
1064 
1065  for(j = 1; j < 3; j++){
1066  dst = s->dest[j];
1067  r->h.pred8x8[itype](dst, s->uvlinesize);
1068  for(i = 0; i < 4; i++, cbp >>= 1){
1069  uint8_t *pdst;
1070  if(!(cbp & 1)) continue;
1071  pdst = dst + (i&1)*4 + (i&2)*2*s->uvlinesize;
1072 
1073  rv34_process_block(r, pdst, s->uvlinesize,
1074  r->chroma_vlc, 1, q_dc, q_ac);
1075  }
1076  }
1077 }
1078 
1079 static void rv34_output_intra(RV34DecContext *r, int8_t *intra_types, int cbp)
1080 {
1081  MpegEncContext *s = &r->s;
1082  uint8_t *dst = s->dest[0];
1083  int avail[6*8] = {0};
1084  int i, j, k;
1085  int idx, q_ac, q_dc;
1086 
1087  // Set neighbour information.
1088  if(r->avail_cache[1])
1089  avail[0] = 1;
1090  if(r->avail_cache[2])
1091  avail[1] = avail[2] = 1;
1092  if(r->avail_cache[3])
1093  avail[3] = avail[4] = 1;
1094  if(r->avail_cache[4])
1095  avail[5] = 1;
1096  if(r->avail_cache[5])
1097  avail[8] = avail[16] = 1;
1098  if(r->avail_cache[9])
1099  avail[24] = avail[32] = 1;
1100 
1101  q_ac = rv34_qscale_tab[s->qscale];
1102  for(j = 0; j < 4; j++){
1103  idx = 9 + j*8;
1104  for(i = 0; i < 4; i++, cbp >>= 1, dst += 4, idx++){
1105  rv34_pred_4x4_block(r, dst, s->linesize, ittrans[intra_types[i]], avail[idx-8], avail[idx-1], avail[idx+7], avail[idx-7]);
1106  avail[idx] = 1;
1107  if(!(cbp & 1)) continue;
1108 
1109  rv34_process_block(r, dst, s->linesize,
1110  r->luma_vlc, 0, q_ac, q_ac);
1111  }
1112  dst += s->linesize * 4 - 4*4;
1113  intra_types += r->intra_types_stride;
1114  }
1115 
1116  intra_types -= r->intra_types_stride * 4;
1117 
1118  q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];
1119  q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];
1120 
1121  for(k = 0; k < 2; k++){
1122  dst = s->dest[1+k];
1123  fill_rectangle(r->avail_cache + 6, 2, 2, 4, 0, 4);
1124 
1125  for(j = 0; j < 2; j++){
1126  int* acache = r->avail_cache + 6 + j*4;
1127  for(i = 0; i < 2; i++, cbp >>= 1, acache++){
1128  int itype = ittrans[intra_types[i*2+j*2*r->intra_types_stride]];
1129  rv34_pred_4x4_block(r, dst+4*i, s->uvlinesize, itype, acache[-4], acache[-1], !i && !j, acache[-3]);
1130  acache[0] = 1;
1131 
1132  if(!(cbp&1)) continue;
1133 
1134  rv34_process_block(r, dst + 4*i, s->uvlinesize,
1135  r->chroma_vlc, 1, q_dc, q_ac);
1136  }
1137 
1138  dst += 4*s->uvlinesize;
1139  }
1140  }
1141 }
1142 
1143 static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)
1144 {
1145  int d;
1146  d = motion_val[0][0] - motion_val[-step][0];
1147  if(d < -3 || d > 3)
1148  return 1;
1149  d = motion_val[0][1] - motion_val[-step][1];
1150  if(d < -3 || d > 3)
1151  return 1;
1152  return 0;
1153 }
1154 
1155 static int rv34_set_deblock_coef(RV34DecContext *r)
1156 {
1157  MpegEncContext *s = &r->s;
1158  int hmvmask = 0, vmvmask = 0, i, j;
1159  int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
1160  int16_t (*motion_val)[2] = &s->current_picture_ptr->motion_val[0][midx];
1161  for(j = 0; j < 16; j += 8){
1162  for(i = 0; i < 2; i++){
1163  if(is_mv_diff_gt_3(motion_val + i, 1))
1164  vmvmask |= 0x11 << (j + i*2);
1165  if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))
1166  hmvmask |= 0x03 << (j + i*2);
1167  }
1168  motion_val += s->b8_stride;
1169  }
1170  if(s->first_slice_line)
1171  hmvmask &= ~0x000F;
1172  if(!s->mb_x)
1173  vmvmask &= ~0x1111;
1174  if(r->rv30){ //RV30 marks both subblocks on the edge for filtering
1175  vmvmask |= (vmvmask & 0x4444) >> 1;
1176  hmvmask |= (hmvmask & 0x0F00) >> 4;
1177  if(s->mb_x)
1178  r->deblock_coefs[s->mb_x - 1 + s->mb_y*s->mb_stride] |= (vmvmask & 0x1111) << 3;
1179  if(!s->first_slice_line)
1180  r->deblock_coefs[s->mb_x + (s->mb_y - 1)*s->mb_stride] |= (hmvmask & 0xF) << 12;
1181  }
1182  return hmvmask | vmvmask;
1183 }
1184 
1185 static int rv34_decode_inter_macroblock(RV34DecContext *r, int8_t *intra_types)
1186 {
1187  MpegEncContext *s = &r->s;
1188  GetBitContext *gb = &s->gb;
1189  uint8_t *dst = s->dest[0];
1190  int16_t *ptr = s->block[0];
1191  int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1192  int cbp, cbp2;
1193  int q_dc, q_ac, has_ac;
1194  int i, j;
1195  int dist;
1196 
1197  // Calculate which neighbours are available. Maybe it's worth optimizing too.
1198  memset(r->avail_cache, 0, sizeof(r->avail_cache));
1199  fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);
1200  dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;
1201  if(s->mb_x && dist)
1202  r->avail_cache[5] =
1203  r->avail_cache[9] = s->current_picture_ptr->mb_type[mb_pos - 1];
1204  if(dist >= s->mb_width)
1205  r->avail_cache[2] =
1206  r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];
1207  if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)
1208  r->avail_cache[4] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];
1209  if(s->mb_x && dist > s->mb_width)
1210  r->avail_cache[1] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];
1211 
1212  s->qscale = r->si.quant;
1213  cbp = cbp2 = rv34_decode_inter_mb_header(r, intra_types);
1214  r->cbp_luma [mb_pos] = cbp;
1215  r->cbp_chroma[mb_pos] = cbp >> 16;
1216  r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r) | r->cbp_luma[mb_pos];
1217  s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;
1218 
1219  if(cbp == -1)
1220  return -1;
1221 
1222  if (IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){
1223  if(r->is16) rv34_output_i16x16(r, intra_types, cbp);
1224  else rv34_output_intra(r, intra_types, cbp);
1225  return 0;
1226  }
1227 
1228  if(r->is16){
1229  // Only for RV34_MB_P_MIX16x16
1230  LOCAL_ALIGNED_16(int16_t, block16, [16]);
1231  memset(block16, 0, 16 * sizeof(*block16));
1232  q_dc = rv34_qscale_tab[ r->luma_dc_quant_p[s->qscale] ];
1233  q_ac = rv34_qscale_tab[s->qscale];
1234  if (rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0, q_dc, q_dc, q_ac))
1235  r->rdsp.rv34_inv_transform(block16);
1236  else
1237  r->rdsp.rv34_inv_transform_dc(block16);
1238 
1239  q_ac = rv34_qscale_tab[s->qscale];
1240 
1241  for(j = 0; j < 4; j++){
1242  for(i = 0; i < 4; i++, cbp >>= 1){
1243  int dc = block16[i + j*4];
1244 
1245  if(cbp & 1){
1246  has_ac = rv34_decode_block(ptr, gb, r->cur_vlcs, r->luma_vlc, 0, q_ac, q_ac, q_ac);
1247  }else
1248  has_ac = 0;
1249 
1250  if(has_ac){
1251  ptr[0] = dc;
1252  r->rdsp.rv34_idct_add(dst+4*i, s->linesize, ptr);
1253  }else
1254  r->rdsp.rv34_idct_dc_add(dst+4*i, s->linesize, dc);
1255  }
1256 
1257  dst += 4*s->linesize;
1258  }
1259 
1260  r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);
1261  }else{
1262  q_ac = rv34_qscale_tab[s->qscale];
1263 
1264  for(j = 0; j < 4; j++){
1265  for(i = 0; i < 4; i++, cbp >>= 1){
1266  if(!(cbp & 1)) continue;
1267 
1268  rv34_process_block(r, dst + 4*i, s->linesize,
1269  r->luma_vlc, 0, q_ac, q_ac);
1270  }
1271  dst += 4*s->linesize;
1272  }
1273  }
1274 
1275  q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];
1276  q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];
1277 
1278  for(j = 1; j < 3; j++){
1279  dst = s->dest[j];
1280  for(i = 0; i < 4; i++, cbp >>= 1){
1281  uint8_t *pdst;
1282  if(!(cbp & 1)) continue;
1283  pdst = dst + (i&1)*4 + (i&2)*2*s->uvlinesize;
1284 
1285  rv34_process_block(r, pdst, s->uvlinesize,
1286  r->chroma_vlc, 1, q_dc, q_ac);
1287  }
1288  }
1289 
1290  return 0;
1291 }
1292 
1293 static int rv34_decode_intra_macroblock(RV34DecContext *r, int8_t *intra_types)
1294 {
1295  MpegEncContext *s = &r->s;
1296  int cbp, dist;
1297  int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1298 
1299  // Calculate which neighbours are available. Maybe it's worth optimizing too.
1300  memset(r->avail_cache, 0, sizeof(r->avail_cache));
1301  fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);
1302  dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;
1303  if(s->mb_x && dist)
1304  r->avail_cache[5] =
1305  r->avail_cache[9] = s->current_picture_ptr->mb_type[mb_pos - 1];
1306  if(dist >= s->mb_width)
1307  r->avail_cache[2] =
1308  r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];
1309  if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)
1310  r->avail_cache[4] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];
1311  if(s->mb_x && dist > s->mb_width)
1312  r->avail_cache[1] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];
1313 
1314  s->qscale = r->si.quant;
1315  cbp = rv34_decode_intra_mb_header(r, intra_types);
1316  r->cbp_luma [mb_pos] = cbp;
1317  r->cbp_chroma[mb_pos] = cbp >> 16;
1318  r->deblock_coefs[mb_pos] = 0xFFFF;
1319  s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;
1320 
1321  if(cbp == -1)
1322  return -1;
1323 
1324  if(r->is16){
1325  rv34_output_i16x16(r, intra_types, cbp);
1326  return 0;
1327  }
1328 
1329  rv34_output_intra(r, intra_types, cbp);
1330  return 0;
1331 }
1332 
1333 static int check_slice_end(RV34DecContext *r, MpegEncContext *s)
1334 {
1335  int bits;
1336  if(s->mb_y >= s->mb_height)
1337  return 1;
1338  if(!s->mb_num_left)
1339  return 1;
1340  if(r->s.mb_skip_run > 1)
1341  return 0;
1342  bits = get_bits_left(&s->gb);
1343  if(bits <= 0 || (bits < 8 && !show_bits(&s->gb, bits)))
1344  return 1;
1345  return 0;
1346 }
1347 
1348 
1349 static void rv34_decoder_free(RV34DecContext *r)
1350 {
1351  av_freep(&r->intra_types_hist);
1352  r->intra_types = NULL;
1353  av_freep(&r->tmp_b_block_base);
1354  av_freep(&r->mb_type);
1355  av_freep(&r->cbp_luma);
1356  av_freep(&r->cbp_chroma);
1357  av_freep(&r->deblock_coefs);
1358 }
1359 
1360 
1361 static int rv34_decoder_alloc(RV34DecContext *r)
1362 {
1363  r->intra_types_stride = r->s.mb_width * 4 + 4;
1364 
1365  r->cbp_chroma = av_mallocz(r->s.mb_stride * r->s.mb_height *
1366  sizeof(*r->cbp_chroma));
1367  r->cbp_luma = av_mallocz(r->s.mb_stride * r->s.mb_height *
1368  sizeof(*r->cbp_luma));
1369  r->deblock_coefs = av_mallocz(r->s.mb_stride * r->s.mb_height *
1370  sizeof(*r->deblock_coefs));
1371  r->intra_types_hist = av_malloc(r->intra_types_stride * 4 * 2 *
1372  sizeof(*r->intra_types_hist));
1373  r->mb_type = av_mallocz(r->s.mb_stride * r->s.mb_height *
1374  sizeof(*r->mb_type));
1375 
1376  if (!(r->cbp_chroma && r->cbp_luma && r->deblock_coefs &&
1377  r->intra_types_hist && r->mb_type)) {
1378  rv34_decoder_free(r);
1379  return AVERROR(ENOMEM);
1380  }
1381 
1382  r->intra_types = r->intra_types_hist + r->intra_types_stride * 4;
1383 
1384  return 0;
1385 }
1386 
1387 
1388 static int rv34_decoder_realloc(RV34DecContext *r)
1389 {
1390  rv34_decoder_free(r);
1391  return rv34_decoder_alloc(r);
1392 }
1393 
1394 
1395 static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int buf_size)
1396 {
1397  MpegEncContext *s = &r->s;
1398  GetBitContext *gb = &s->gb;
1399  int mb_pos, slice_type;
1400  int res;
1401 
1402  init_get_bits(&r->s.gb, buf, buf_size*8);
1403  res = r->parse_slice_header(r, gb, &r->si);
1404  if(res < 0){
1405  av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");
1406  return -1;
1407  }
1408 
1409  slice_type = r->si.type ? r->si.type : AV_PICTURE_TYPE_I;
1410  if (slice_type != s->pict_type) {
1411  av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");
1412  return AVERROR_INVALIDDATA;
1413  }
1414  if (s->width != r->si.width || s->height != r->si.height) {
1415  av_log(s->avctx, AV_LOG_ERROR, "Size mismatch\n");
1416  return AVERROR_INVALIDDATA;
1417  }
1418 
1419  r->si.end = end;
1420  s->qscale = r->si.quant;
1421  s->mb_num_left = r->si.end - r->si.start;
1422  r->s.mb_skip_run = 0;
1423 
1424  mb_pos = s->mb_x + s->mb_y * s->mb_width;
1425  if(r->si.start != mb_pos){
1426  av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);
1427  s->mb_x = r->si.start % s->mb_width;
1428  s->mb_y = r->si.start / s->mb_width;
1429  }
1430  memset(r->intra_types_hist, -1, r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));
1431  s->first_slice_line = 1;
1432  s->resync_mb_x = s->mb_x;
1433  s->resync_mb_y = s->mb_y;
1434 
1435  ff_init_block_index(s);
1436  while(!check_slice_end(r, s)) {
1437  ff_update_block_index(s);
1438 
1439  if(r->si.type)
1440  res = rv34_decode_inter_macroblock(r, r->intra_types + s->mb_x * 4 + 4);
1441  else
1442  res = rv34_decode_intra_macroblock(r, r->intra_types + s->mb_x * 4 + 4);
1443  if(res < 0){
1444  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_ERROR);
1445  return -1;
1446  }
1447  if (++s->mb_x == s->mb_width) {
1448  s->mb_x = 0;
1449  s->mb_y++;
1450  ff_init_block_index(s);
1451 
1452  memmove(r->intra_types_hist, r->intra_types, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));
1453  memset(r->intra_types, -1, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));
1454 
1455  if(r->loop_filter && s->mb_y >= 2)
1456  r->loop_filter(r, s->mb_y - 2);
1457 
1458  if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))
1459  ff_thread_report_progress(&s->current_picture_ptr->tf,
1460  s->mb_y - 2, 0);
1461 
1462  }
1463  if(s->mb_x == s->resync_mb_x)
1464  s->first_slice_line=0;
1465  s->mb_num_left--;
1466  }
1467  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
1468 
1469  return s->mb_y == s->mb_height;
1470 }
1471 
1472 /** @} */ // recons group end
1473 
1474 /**
1475  * Initialize decoder.
1476  */
1477 av_cold int ff_rv34_decode_init(AVCodecContext *avctx)
1478 {
1479  RV34DecContext *r = avctx->priv_data;
1480  MpegEncContext *s = &r->s;
1481  int ret;
1482 
1483  ff_MPV_decode_defaults(s);
1484  s->avctx = avctx;
1485  s->out_format = FMT_H263;
1486  s->codec_id = avctx->codec_id;
1487 
1488  s->width = avctx->width;
1489  s->height = avctx->height;
1490 
1491  r->s.avctx = avctx;
1492  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
1493  avctx->has_b_frames = 1;
1494  s->low_delay = 0;
1495 
1496  if ((ret = ff_MPV_common_init(s)) < 0)
1497  return ret;
1498 
1499  ff_h264_pred_init(&r->h, AV_CODEC_ID_RV40, 8, 1);
1500 
1501 #if CONFIG_RV30_DECODER
1502  if (avctx->codec_id == AV_CODEC_ID_RV30)
1503  ff_rv30dsp_init(&r->rdsp);
1504 #endif
1505 #if CONFIG_RV40_DECODER
1506  if (avctx->codec_id == AV_CODEC_ID_RV40)
1507  ff_rv40dsp_init(&r->rdsp);
1508 #endif
1509 
1510  if ((ret = rv34_decoder_alloc(r)) < 0) {
1511  ff_MPV_common_end(&r->s);
1512  return ret;
1513  }
1514 
1515  if(!intra_vlcs[0].cbppattern[0].bits)
1516  rv34_init_tables();
1517 
1518  avctx->internal->allocate_progress = 1;
1519 
1520  return 0;
1521 }
1522 
1523 int ff_rv34_decode_init_thread_copy(AVCodecContext *avctx)
1524 {
1525  int err;
1526  RV34DecContext *r = avctx->priv_data;
1527 
1528  r->s.avctx = avctx;
1529 
1530  if (avctx->internal->is_copy) {
1531  r->tmp_b_block_base = NULL;
1532  if ((err = ff_MPV_common_init(&r->s)) < 0)
1533  return err;
1534  if ((err = rv34_decoder_alloc(r)) < 0) {
1535  ff_MPV_common_end(&r->s);
1536  return err;
1537  }
1538  }
1539 
1540  return 0;
1541 }
1542 
1543 int ff_rv34_decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1544 {
1545  RV34DecContext *r = dst->priv_data, *r1 = src->priv_data;
1546  MpegEncContext * const s = &r->s, * const s1 = &r1->s;
1547  int err;
1548 
1549  if (dst == src || !s1->context_initialized)
1550  return 0;
1551 
1552  if (s->height != s1->height || s->width != s1->width) {
1553  s->height = s1->height;
1554  s->width = s1->width;
1555  if ((err = ff_MPV_common_frame_size_change(s)) < 0)
1556  return err;
1557  if ((err = rv34_decoder_realloc(r)) < 0)
1558  return err;
1559  }
1560 
1561  if ((err = ff_mpeg_update_thread_context(dst, src)))
1562  return err;
1563 
1564  r->cur_pts = r1->cur_pts;
1565  r->last_pts = r1->last_pts;
1566  r->next_pts = r1->next_pts;
1567 
1568  memset(&r->si, 0, sizeof(r->si));
1569 
1570  return 0;
1571 }
1572 
1573 static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
1574 {
1575  if(avctx->slice_count) return avctx->slice_offset[n];
1576  else return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) : AV_RB32(buf + n*8);
1577 }
1578 
1579 static int finish_frame(AVCodecContext *avctx, AVFrame *pict)
1580 {
1581  RV34DecContext *r = avctx->priv_data;
1582  MpegEncContext *s = &r->s;
1583  int got_picture = 0, ret;
1584 
1585  ff_er_frame_end(&s->er);
1586  ff_MPV_frame_end(s);
1587  s->mb_num_left = 0;
1588 
1589  if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))
1590  ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX, 0);
1591 
1592  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1593  if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
1594  return ret;
1595  ff_print_debug_info(s, s->current_picture_ptr, pict);
1596  ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
1597  got_picture = 1;
1598  } else if (s->last_picture_ptr != NULL) {
1599  if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
1600  return ret;
1601  ff_print_debug_info(s, s->last_picture_ptr, pict);
1602  ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
1603  got_picture = 1;
1604  }
1605 
1606  return got_picture;
1607 }
1608 
1609 static AVRational update_sar(int old_w, int old_h, AVRational sar, int new_w, int new_h)
1610 {
1611  // attempt to keep aspect during typical resolution switches
1612  if (!sar.num)
1613  sar = (AVRational){1, 1};
1614 
1615  sar = av_mul_q(sar, (AVRational){new_h * old_w, new_w * old_h});
1616  return sar;
1617 }
1618 
1619 int ff_rv34_decode_frame(AVCodecContext *avctx,
1620  void *data, int *got_picture_ptr,
1621  AVPacket *avpkt)
1622 {
1623  const uint8_t *buf = avpkt->data;
1624  int buf_size = avpkt->size;
1625  RV34DecContext *r = avctx->priv_data;
1626  MpegEncContext *s = &r->s;
1627  AVFrame *pict = data;
1628  SliceInfo si;
1629  int i, ret;
1630  int slice_count;
1631  const uint8_t *slices_hdr = NULL;
1632  int last = 0;
1633 
1634  /* no supplementary picture */
1635  if (buf_size == 0) {
1636  /* special case for last picture */
1637  if (s->low_delay==0 && s->next_picture_ptr) {
1638  if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
1639  return ret;
1640  s->next_picture_ptr = NULL;
1641 
1642  *got_picture_ptr = 1;
1643  }
1644  return 0;
1645  }
1646 
1647  if(!avctx->slice_count){
1648  slice_count = (*buf++) + 1;
1649  slices_hdr = buf + 4;
1650  buf += 8 * slice_count;
1651  buf_size -= 1 + 8 * slice_count;
1652  }else
1653  slice_count = avctx->slice_count;
1654 
1655  //parse first slice header to check whether this frame can be decoded
1656  if(get_slice_offset(avctx, slices_hdr, 0) < 0 ||
1657  get_slice_offset(avctx, slices_hdr, 0) > buf_size){
1658  av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");
1659  return AVERROR_INVALIDDATA;
1660  }
1661  init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), (buf_size-get_slice_offset(avctx, slices_hdr, 0))*8);
1662  if(r->parse_slice_header(r, &r->s.gb, &si) < 0 || si.start){
1663  av_log(avctx, AV_LOG_ERROR, "First slice header is incorrect\n");
1664  return AVERROR_INVALIDDATA;
1665  }
1666  if ((!s->last_picture_ptr || !s->last_picture_ptr->f.data[0]) &&
1667  si.type == AV_PICTURE_TYPE_B) {
1668  av_log(avctx, AV_LOG_ERROR, "Invalid decoder state: B-frame without "
1669  "reference data.\n");
1670  return AVERROR_INVALIDDATA;
1671  }
1672  if( (avctx->skip_frame >= AVDISCARD_NONREF && si.type==AV_PICTURE_TYPE_B)
1673  || (avctx->skip_frame >= AVDISCARD_NONKEY && si.type!=AV_PICTURE_TYPE_I)
1674  || avctx->skip_frame >= AVDISCARD_ALL)
1675  return avpkt->size;
1676 
1677  /* first slice */
1678  if (si.start == 0) {
1679  if (s->mb_num_left > 0) {
1680  av_log(avctx, AV_LOG_ERROR, "New frame but still %d MB left.\n",
1681  s->mb_num_left);
1682  ff_er_frame_end(&s->er);
1683  ff_MPV_frame_end(s);
1684  }
1685 
1686  if (s->width != si.width || s->height != si.height) {
1687  int err;
1688 
1689  av_log(s->avctx, AV_LOG_WARNING, "Changing dimensions to %dx%d\n",
1690  si.width, si.height);
1691 
1692  if (av_image_check_size(si.width, si.height, 0, s->avctx))
1693  return AVERROR_INVALIDDATA;
1694 
1695  s->avctx->sample_aspect_ratio = update_sar(
1696  s->width, s->height, s->avctx->sample_aspect_ratio,
1697  si.width, si.height);
1698  s->width = si.width;
1699  s->height = si.height;
1700 
1701  err = ff_set_dimensions(s->avctx, s->width, s->height);
1702  if (err < 0)
1703  return err;
1704 
1705  if ((err = ff_MPV_common_frame_size_change(s)) < 0)
1706  return err;
1707  if ((err = rv34_decoder_realloc(r)) < 0)
1708  return err;
1709  }
1710  s->pict_type = si.type ? si.type : AV_PICTURE_TYPE_I;
1711  if (ff_MPV_frame_start(s, s->avctx) < 0)
1712  return -1;
1713  ff_mpeg_er_frame_start(s);
1714  if (!r->tmp_b_block_base) {
1715  int i;
1716 
1717  r->tmp_b_block_base = av_malloc(s->linesize * 48);
1718  for (i = 0; i < 2; i++)
1719  r->tmp_b_block_y[i] = r->tmp_b_block_base
1720  + i * 16 * s->linesize;
1721  for (i = 0; i < 4; i++)
1722  r->tmp_b_block_uv[i] = r->tmp_b_block_base + 32 * s->linesize
1723  + (i >> 1) * 8 * s->uvlinesize
1724  + (i & 1) * 16;
1725  }
1726  r->cur_pts = si.pts;
1727  if (s->pict_type != AV_PICTURE_TYPE_B) {
1728  r->last_pts = r->next_pts;
1729  r->next_pts = r->cur_pts;
1730  } else {
1731  int refdist = GET_PTS_DIFF(r->next_pts, r->last_pts);
1732  int dist0 = GET_PTS_DIFF(r->cur_pts, r->last_pts);
1733  int dist1 = GET_PTS_DIFF(r->next_pts, r->cur_pts);
1734 
1735  if(!refdist){
1736  r->mv_weight1 = r->mv_weight2 = r->weight1 = r->weight2 = 8192;
1737  r->scaled_weight = 0;
1738  }else{
1739  r->mv_weight1 = (dist0 << 14) / refdist;
1740  r->mv_weight2 = (dist1 << 14) / refdist;
1741  if((r->mv_weight1|r->mv_weight2) & 511){
1742  r->weight1 = r->mv_weight1;
1743  r->weight2 = r->mv_weight2;
1744  r->scaled_weight = 0;
1745  }else{
1746  r->weight1 = r->mv_weight1 >> 9;
1747  r->weight2 = r->mv_weight2 >> 9;
1748  r->scaled_weight = 1;
1749  }
1750  }
1751  }
1752  s->mb_x = s->mb_y = 0;
1753  ff_thread_finish_setup(s->avctx);
1754  } else if (HAVE_THREADS &&
1755  (s->avctx->active_thread_type & FF_THREAD_FRAME)) {
1756  av_log(s->avctx, AV_LOG_ERROR, "Decoder needs full frames in frame "
1757  "multithreading mode (start MB is %d).\n", si.start);
1758  return AVERROR_INVALIDDATA;
1759  }
1760 
1761  for(i = 0; i < slice_count; i++){
1762  int offset = get_slice_offset(avctx, slices_hdr, i);
1763  int size;
1764  if(i+1 == slice_count)
1765  size = buf_size - offset;
1766  else
1767  size = get_slice_offset(avctx, slices_hdr, i+1) - offset;
1768 
1769  if(offset < 0 || offset > buf_size){
1770  av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");
1771  break;
1772  }
1773 
1774  r->si.end = s->mb_width * s->mb_height;
1775  s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;
1776 
1777  if(i+1 < slice_count){
1778  if (get_slice_offset(avctx, slices_hdr, i+1) < 0 ||
1779  get_slice_offset(avctx, slices_hdr, i+1) > buf_size) {
1780  av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");
1781  break;
1782  }
1783  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);
1784  if(r->parse_slice_header(r, &r->s.gb, &si) < 0){
1785  if(i+2 < slice_count)
1786  size = get_slice_offset(avctx, slices_hdr, i+2) - offset;
1787  else
1788  size = buf_size - offset;
1789  }else
1790  r->si.end = si.start;
1791  }
1792  if (size < 0 || size > buf_size - offset) {
1793  av_log(avctx, AV_LOG_ERROR, "Slice size is invalid\n");
1794  break;
1795  }
1796  last = rv34_decode_slice(r, r->si.end, buf + offset, size);
1797  if(last)
1798  break;
1799  }
1800 
1801  if (s->current_picture_ptr) {
1802  if (last) {
1803  if(r->loop_filter)
1804  r->loop_filter(r, s->mb_height - 1);
1805 
1806  ret = finish_frame(avctx, pict);
1807  if (ret < 0)
1808  return ret;
1809  *got_picture_ptr = ret;
1810  } else if (HAVE_THREADS &&
1811  (s->avctx->active_thread_type & FF_THREAD_FRAME)) {
1812  av_log(avctx, AV_LOG_INFO, "marking unfished frame as finished\n");
1813  /* always mark the current frame as finished, frame-mt supports
1814  * only complete frames */
1815  ff_er_frame_end(&s->er);
1816  ff_MPV_frame_end(s);
1817  s->mb_num_left = 0;
1818  ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX, 0);
1819  return AVERROR_INVALIDDATA;
1820  }
1821  }
1822 
1823  return avpkt->size;
1824 }
1825 
1826 av_cold int ff_rv34_decode_end(AVCodecContext *avctx)
1827 {
1828  RV34DecContext *r = avctx->priv_data;
1829 
1830  ff_MPV_common_end(&r->s);
1831  rv34_decoder_free(r);
1832 
1833  return 0;
1834 }
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