FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
rv34.c
Go to the documentation of this file.
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 "mpegutils.h"
33 #include "mpegvideo.h"
34 #include "golomb.h"
35 #include "internal.h"
36 #include "mathops.h"
37 #include "mpeg_er.h"
38 #include "qpeldsp.h"
39 #include "rectangle.h"
40 #include "thread.h"
41 
42 #include "rv34vlc.h"
43 #include "rv34data.h"
44 #include "rv34.h"
45 
46 static inline void ZERO8x2(void* dst, int stride)
47 {
48  fill_rectangle(dst, 1, 2, stride, 0, 4);
49  fill_rectangle(((uint8_t*)(dst))+4, 1, 2, stride, 0, 4);
50 }
51 
52 /** translation of RV30/40 macroblock types to lavc ones */
53 static const int rv34_mb_type_to_lavc[12] = {
54  MB_TYPE_INTRA,
55  MB_TYPE_INTRA16x16 | MB_TYPE_SEPARATE_DC,
56  MB_TYPE_16x16 | MB_TYPE_L0,
57  MB_TYPE_8x8 | MB_TYPE_L0,
58  MB_TYPE_16x16 | MB_TYPE_L0,
59  MB_TYPE_16x16 | MB_TYPE_L1,
60  MB_TYPE_SKIP,
61  MB_TYPE_DIRECT2 | MB_TYPE_16x16,
62  MB_TYPE_16x8 | MB_TYPE_L0,
63  MB_TYPE_8x16 | MB_TYPE_L0,
64  MB_TYPE_16x16 | MB_TYPE_L0L1,
65  MB_TYPE_16x16 | MB_TYPE_L0 | MB_TYPE_SEPARATE_DC
66 };
67 
68 
69 static RV34VLC intra_vlcs[NUM_INTRA_TABLES], inter_vlcs[NUM_INTER_TABLES];
70 
71 static int rv34_decode_mv(RV34DecContext *r, int block_type);
72 
73 /**
74  * @name RV30/40 VLC generating functions
75  * @{
76  */
77 
78 static const int table_offs[] = {
79  0, 1818, 3622, 4144, 4698, 5234, 5804, 5868, 5900, 5932,
80  5996, 6252, 6316, 6348, 6380, 7674, 8944, 10274, 11668, 12250,
81  14060, 15846, 16372, 16962, 17512, 18148, 18180, 18212, 18244, 18308,
82  18564, 18628, 18660, 18692, 20036, 21314, 22648, 23968, 24614, 26384,
83  28190, 28736, 29366, 29938, 30608, 30640, 30672, 30704, 30768, 31024,
84  31088, 31120, 31184, 32570, 33898, 35236, 36644, 37286, 39020, 40802,
85  41368, 42052, 42692, 43348, 43380, 43412, 43444, 43476, 43604, 43668,
86  43700, 43732, 45100, 46430, 47778, 49160, 49802, 51550, 53340, 53972,
87  54648, 55348, 55994, 56122, 56154, 56186, 56218, 56346, 56410, 56442,
88  56474, 57878, 59290, 60636, 62036, 62682, 64460, 64524, 64588, 64716,
89  64844, 66076, 67466, 67978, 68542, 69064, 69648, 70296, 72010, 72074,
90  72138, 72202, 72330, 73572, 74936, 75454, 76030, 76566, 77176, 77822,
91  79582, 79646, 79678, 79742, 79870, 81180, 82536, 83064, 83672, 84242,
92  84934, 85576, 87384, 87448, 87480, 87544, 87672, 88982, 90340, 90902,
93  91598, 92182, 92846, 93488, 95246, 95278, 95310, 95374, 95502, 96878,
94  98266, 98848, 99542, 100234, 100884, 101524, 103320, 103352, 103384, 103416,
95  103480, 104874, 106222, 106910, 107584, 108258, 108902, 109544, 111366, 111398,
96  111430, 111462, 111494, 112878, 114320, 114988, 115660, 116310, 116950, 117592
97 };
98 
99 static VLC_TYPE table_data[117592][2];
100 
101 /**
102  * Generate VLC from codeword lengths.
103  * @param bits codeword lengths (zeroes are accepted)
104  * @param size length of input data
105  * @param vlc output VLC
106  * @param insyms symbols for input codes (NULL for default ones)
107  * @param num VLC table number (for static initialization)
108  */
109 static void rv34_gen_vlc(const uint8_t *bits, int size, VLC *vlc, const uint8_t *insyms,
110  const int num)
111 {
112  int i;
113  int counts[17] = {0}, codes[17];
114  uint16_t cw[MAX_VLC_SIZE], syms[MAX_VLC_SIZE];
115  uint8_t bits2[MAX_VLC_SIZE];
116  int maxbits = 0, realsize = 0;
117 
118  for(i = 0; i < size; i++){
119  if(bits[i]){
120  bits2[realsize] = bits[i];
121  syms[realsize] = insyms ? insyms[i] : i;
122  realsize++;
123  maxbits = FFMAX(maxbits, bits[i]);
124  counts[bits[i]]++;
125  }
126  }
127 
128  codes[0] = 0;
129  for(i = 0; i < 16; i++)
130  codes[i+1] = (codes[i] + counts[i]) << 1;
131  for(i = 0; i < realsize; i++)
132  cw[i] = codes[bits2[i]]++;
133 
134  vlc->table = &table_data[table_offs[num]];
135  vlc->table_allocated = table_offs[num + 1] - table_offs[num];
136  ff_init_vlc_sparse(vlc, FFMIN(maxbits, 9), realsize,
137  bits2, 1, 1,
138  cw, 2, 2,
139  syms, 2, 2, INIT_VLC_USE_NEW_STATIC);
140 }
141 
142 /**
143  * Initialize all tables.
144  */
145 static av_cold void rv34_init_tables(void)
146 {
147  int i, j, k;
148 
149  for(i = 0; i < NUM_INTRA_TABLES; i++){
150  for(j = 0; j < 2; j++){
151  rv34_gen_vlc(rv34_table_intra_cbppat [i][j], CBPPAT_VLC_SIZE, &intra_vlcs[i].cbppattern[j], NULL, 19*i + 0 + j);
152  rv34_gen_vlc(rv34_table_intra_secondpat[i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].second_pattern[j], NULL, 19*i + 2 + j);
153  rv34_gen_vlc(rv34_table_intra_thirdpat [i][j], OTHERBLK_VLC_SIZE, &intra_vlcs[i].third_pattern[j], NULL, 19*i + 4 + j);
154  for(k = 0; k < 4; k++){
155  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);
156  }
157  }
158  for(j = 0; j < 4; j++){
159  rv34_gen_vlc(rv34_table_intra_firstpat[i][j], FIRSTBLK_VLC_SIZE, &intra_vlcs[i].first_pattern[j], NULL, 19*i + 14 + j);
160  }
161  rv34_gen_vlc(rv34_intra_coeff[i], COEFF_VLC_SIZE, &intra_vlcs[i].coefficient, NULL, 19*i + 18);
162  }
163 
164  for(i = 0; i < NUM_INTER_TABLES; i++){
165  rv34_gen_vlc(rv34_inter_cbppat[i], CBPPAT_VLC_SIZE, &inter_vlcs[i].cbppattern[0], NULL, i*12 + 95);
166  for(j = 0; j < 4; j++){
167  rv34_gen_vlc(rv34_inter_cbp[i][j], CBP_VLC_SIZE, &inter_vlcs[i].cbp[0][j], rv34_cbp_code, i*12 + 96 + j);
168  }
169  for(j = 0; j < 2; j++){
170  rv34_gen_vlc(rv34_table_inter_firstpat [i][j], FIRSTBLK_VLC_SIZE, &inter_vlcs[i].first_pattern[j], NULL, i*12 + 100 + j);
171  rv34_gen_vlc(rv34_table_inter_secondpat[i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].second_pattern[j], NULL, i*12 + 102 + j);
172  rv34_gen_vlc(rv34_table_inter_thirdpat [i][j], OTHERBLK_VLC_SIZE, &inter_vlcs[i].third_pattern[j], NULL, i*12 + 104 + j);
173  }
174  rv34_gen_vlc(rv34_inter_coeff[i], COEFF_VLC_SIZE, &inter_vlcs[i].coefficient, NULL, i*12 + 106);
175  }
176 }
177 
178 /** @} */ // vlc group
179 
180 /**
181  * @name RV30/40 4x4 block decoding functions
182  * @{
183  */
184 
185 /**
186  * Decode coded block pattern.
187  */
188 static int rv34_decode_cbp(GetBitContext *gb, RV34VLC *vlc, int table)
189 {
190  int pattern, code, cbp=0;
191  int ones;
192  static const int cbp_masks[3] = {0x100000, 0x010000, 0x110000};
193  static const int shifts[4] = { 0, 2, 8, 10 };
194  const int *curshift = shifts;
195  int i, t, mask;
196 
197  code = get_vlc2(gb, vlc->cbppattern[table].table, 9, 2);
198  pattern = code & 0xF;
199  code >>= 4;
200 
201  ones = rv34_count_ones[pattern];
202 
203  for(mask = 8; mask; mask >>= 1, curshift++){
204  if(pattern & mask)
205  cbp |= get_vlc2(gb, vlc->cbp[table][ones].table, vlc->cbp[table][ones].bits, 1) << curshift[0];
206  }
207 
208  for(i = 0; i < 4; i++){
209  t = (modulo_three_table[code] >> (6 - 2*i)) & 3;
210  if(t == 1)
211  cbp |= cbp_masks[get_bits1(gb)] << i;
212  if(t == 2)
213  cbp |= cbp_masks[2] << i;
214  }
215  return cbp;
216 }
217 
218 /**
219  * Get one coefficient value from the bitstream and store it.
220  */
221 static inline void decode_coeff(int16_t *dst, int coef, int esc, GetBitContext *gb, VLC* vlc, int q)
222 {
223  if(coef){
224  if(coef == esc){
225  coef = get_vlc2(gb, vlc->table, 9, 2);
226  if(coef > 23){
227  coef -= 23;
228  coef = 22 + ((1 << coef) | get_bits(gb, coef));
229  }
230  coef += esc;
231  }
232  if(get_bits1(gb))
233  coef = -coef;
234  *dst = (coef*q + 8) >> 4;
235  }
236 }
237 
238 /**
239  * Decode 2x2 subblock of coefficients.
240  */
241 static inline void decode_subblock(int16_t *dst, int code, const int is_block2, GetBitContext *gb, VLC *vlc, int q)
242 {
243  int flags = modulo_three_table[code];
244 
245  decode_coeff( dst+0*4+0, (flags >> 6) , 3, gb, vlc, q);
246  if(is_block2){
247  decode_coeff(dst+1*4+0, (flags >> 4) & 3, 2, gb, vlc, q);
248  decode_coeff(dst+0*4+1, (flags >> 2) & 3, 2, gb, vlc, q);
249  }else{
250  decode_coeff(dst+0*4+1, (flags >> 4) & 3, 2, gb, vlc, q);
251  decode_coeff(dst+1*4+0, (flags >> 2) & 3, 2, gb, vlc, q);
252  }
253  decode_coeff( dst+1*4+1, (flags >> 0) & 3, 2, gb, vlc, q);
254 }
255 
256 /**
257  * Decode a single coefficient.
258  */
259 static inline void decode_subblock1(int16_t *dst, int code, GetBitContext *gb, VLC *vlc, int q)
260 {
261  int coeff = modulo_three_table[code] >> 6;
262  decode_coeff(dst, coeff, 3, gb, vlc, q);
263 }
264 
265 static inline void decode_subblock3(int16_t *dst, int code, GetBitContext *gb, VLC *vlc,
266  int q_dc, int q_ac1, int q_ac2)
267 {
268  int flags = modulo_three_table[code];
269 
270  decode_coeff(dst+0*4+0, (flags >> 6) , 3, gb, vlc, q_dc);
271  decode_coeff(dst+0*4+1, (flags >> 4) & 3, 2, gb, vlc, q_ac1);
272  decode_coeff(dst+1*4+0, (flags >> 2) & 3, 2, gb, vlc, q_ac1);
273  decode_coeff(dst+1*4+1, (flags >> 0) & 3, 2, gb, vlc, q_ac2);
274 }
275 
276 /**
277  * Decode coefficients for 4x4 block.
278  *
279  * This is done by filling 2x2 subblocks with decoded coefficients
280  * in this order (the same for subblocks and subblock coefficients):
281  * o--o
282  * /
283  * /
284  * o--o
285  */
286 
287 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)
288 {
289  int code, pattern, has_ac = 1;
290 
291  code = get_vlc2(gb, rvlc->first_pattern[fc].table, 9, 2);
292 
293  pattern = code & 0x7;
294 
295  code >>= 3;
296 
297  if (modulo_three_table[code] & 0x3F) {
298  decode_subblock3(dst, code, gb, &rvlc->coefficient, q_dc, q_ac1, q_ac2);
299  } else {
300  decode_subblock1(dst, code, gb, &rvlc->coefficient, q_dc);
301  if (!pattern)
302  return 0;
303  has_ac = 0;
304  }
305 
306  if(pattern & 4){
307  code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);
308  decode_subblock(dst + 4*0+2, code, 0, gb, &rvlc->coefficient, q_ac2);
309  }
310  if(pattern & 2){ // Looks like coefficients 1 and 2 are swapped for this block
311  code = get_vlc2(gb, rvlc->second_pattern[sc].table, 9, 2);
312  decode_subblock(dst + 4*2+0, code, 1, gb, &rvlc->coefficient, q_ac2);
313  }
314  if(pattern & 1){
315  code = get_vlc2(gb, rvlc->third_pattern[sc].table, 9, 2);
316  decode_subblock(dst + 4*2+2, code, 0, gb, &rvlc->coefficient, q_ac2);
317  }
318  return has_ac | pattern;
319 }
320 
321 /**
322  * @name RV30/40 bitstream parsing
323  * @{
324  */
325 
326 /**
327  * Decode starting slice position.
328  * @todo Maybe replace with ff_h263_decode_mba() ?
329  */
330 int ff_rv34_get_start_offset(GetBitContext *gb, int mb_size)
331 {
332  int i;
333  for(i = 0; i < 5; i++)
334  if(rv34_mb_max_sizes[i] >= mb_size - 1)
335  break;
336  return rv34_mb_bits_sizes[i];
337 }
338 
339 /**
340  * Select VLC set for decoding from current quantizer, modifier and frame type.
341  */
342 static inline RV34VLC* choose_vlc_set(int quant, int mod, int type)
343 {
344  if(mod == 2 && quant < 19) quant += 10;
345  else if(mod && quant < 26) quant += 5;
346  return type ? &inter_vlcs[rv34_quant_to_vlc_set[1][av_clip(quant, 0, 30)]]
347  : &intra_vlcs[rv34_quant_to_vlc_set[0][av_clip(quant, 0, 30)]];
348 }
349 
350 /**
351  * Decode intra macroblock header and return CBP in case of success, -1 otherwise.
352  */
353 static int rv34_decode_intra_mb_header(RV34DecContext *r, int8_t *intra_types)
354 {
355  MpegEncContext *s = &r->s;
356  GetBitContext *gb = &s->gb;
357  int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
358  int t;
359 
360  r->is16 = get_bits1(gb);
361  if(r->is16){
362  s->current_picture_ptr->mb_type[mb_pos] = MB_TYPE_INTRA16x16;
363  r->block_type = RV34_MB_TYPE_INTRA16x16;
364  t = get_bits(gb, 2);
365  fill_rectangle(intra_types, 4, 4, r->intra_types_stride, t, sizeof(intra_types[0]));
366  r->luma_vlc = 2;
367  }else{
368  if(!r->rv30){
369  if(!get_bits1(gb))
370  av_log(s->avctx, AV_LOG_ERROR, "Need DQUANT\n");
371  }
372  s->current_picture_ptr->mb_type[mb_pos] = MB_TYPE_INTRA;
373  r->block_type = RV34_MB_TYPE_INTRA;
374  if(r->decode_intra_types(r, gb, intra_types) < 0)
375  return -1;
376  r->luma_vlc = 1;
377  }
378 
379  r->chroma_vlc = 0;
380  r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
381 
382  return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);
383 }
384 
385 /**
386  * Decode inter macroblock header and return CBP in case of success, -1 otherwise.
387  */
388 static int rv34_decode_inter_mb_header(RV34DecContext *r, int8_t *intra_types)
389 {
390  MpegEncContext *s = &r->s;
391  GetBitContext *gb = &s->gb;
392  int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
393  int i, t;
394 
395  r->block_type = r->decode_mb_info(r);
396  if(r->block_type == -1)
397  return -1;
398  s->current_picture_ptr->mb_type[mb_pos] = rv34_mb_type_to_lavc[r->block_type];
399  r->mb_type[mb_pos] = r->block_type;
400  if(r->block_type == RV34_MB_SKIP){
401  if(s->pict_type == AV_PICTURE_TYPE_P)
402  r->mb_type[mb_pos] = RV34_MB_P_16x16;
403  if(s->pict_type == AV_PICTURE_TYPE_B)
404  r->mb_type[mb_pos] = RV34_MB_B_DIRECT;
405  }
406  r->is16 = !!IS_INTRA16x16(s->current_picture_ptr->mb_type[mb_pos]);
407  rv34_decode_mv(r, r->block_type);
408  if(r->block_type == RV34_MB_SKIP){
409  fill_rectangle(intra_types, 4, 4, r->intra_types_stride, 0, sizeof(intra_types[0]));
410  return 0;
411  }
412  r->chroma_vlc = 1;
413  r->luma_vlc = 0;
414 
415  if(IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){
416  if(r->is16){
417  t = get_bits(gb, 2);
418  fill_rectangle(intra_types, 4, 4, r->intra_types_stride, t, sizeof(intra_types[0]));
419  r->luma_vlc = 2;
420  }else{
421  if(r->decode_intra_types(r, gb, intra_types) < 0)
422  return -1;
423  r->luma_vlc = 1;
424  }
425  r->chroma_vlc = 0;
426  r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
427  }else{
428  for(i = 0; i < 16; i++)
429  intra_types[(i & 3) + (i>>2) * r->intra_types_stride] = 0;
430  r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);
431  if(r->mb_type[mb_pos] == RV34_MB_P_MIX16x16){
432  r->is16 = 1;
433  r->chroma_vlc = 1;
434  r->luma_vlc = 2;
435  r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 0);
436  }
437  }
438 
439  return rv34_decode_cbp(gb, r->cur_vlcs, r->is16);
440 }
441 
442 /** @} */ //bitstream functions
443 
444 /**
445  * @name motion vector related code (prediction, reconstruction, motion compensation)
446  * @{
447  */
448 
449 /** macroblock partition width in 8x8 blocks */
450 static const uint8_t part_sizes_w[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 2, 1, 2, 2 };
451 
452 /** macroblock partition height in 8x8 blocks */
453 static const uint8_t part_sizes_h[RV34_MB_TYPES] = { 2, 2, 2, 1, 2, 2, 2, 2, 1, 2, 2, 2 };
454 
455 /** availability index for subblocks */
456 static const uint8_t avail_indexes[4] = { 6, 7, 10, 11 };
457 
458 /**
459  * motion vector prediction
460  *
461  * Motion prediction performed for the block by using median prediction of
462  * motion vectors from the left, top and right top blocks but in corner cases
463  * some other vectors may be used instead.
464  */
465 static void rv34_pred_mv(RV34DecContext *r, int block_type, int subblock_no, int dmv_no)
466 {
467  MpegEncContext *s = &r->s;
468  int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
469  int A[2] = {0}, B[2], C[2];
470  int i, j;
471  int mx, my;
472  int* avail = r->avail_cache + avail_indexes[subblock_no];
473  int c_off = part_sizes_w[block_type];
474 
475  mv_pos += (subblock_no & 1) + (subblock_no >> 1)*s->b8_stride;
476  if(subblock_no == 3)
477  c_off = -1;
478 
479  if(avail[-1]){
480  A[0] = s->current_picture_ptr->motion_val[0][mv_pos-1][0];
481  A[1] = s->current_picture_ptr->motion_val[0][mv_pos-1][1];
482  }
483  if(avail[-4]){
484  B[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][0];
485  B[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride][1];
486  }else{
487  B[0] = A[0];
488  B[1] = A[1];
489  }
490  if(!avail[c_off-4]){
491  if(avail[-4] && (avail[-1] || r->rv30)){
492  C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][0];
493  C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride-1][1];
494  }else{
495  C[0] = A[0];
496  C[1] = A[1];
497  }
498  }else{
499  C[0] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+c_off][0];
500  C[1] = s->current_picture_ptr->motion_val[0][mv_pos-s->b8_stride+c_off][1];
501  }
502  mx = mid_pred(A[0], B[0], C[0]);
503  my = mid_pred(A[1], B[1], C[1]);
504  mx += r->dmv[dmv_no][0];
505  my += r->dmv[dmv_no][1];
506  for(j = 0; j < part_sizes_h[block_type]; j++){
507  for(i = 0; i < part_sizes_w[block_type]; i++){
508  s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][0] = mx;
509  s->current_picture_ptr->motion_val[0][mv_pos + i + j*s->b8_stride][1] = my;
510  }
511  }
512 }
513 
514 #define GET_PTS_DIFF(a, b) (((a) - (b) + 8192) & 0x1FFF)
515 
516 /**
517  * Calculate motion vector component that should be added for direct blocks.
518  */
519 static int calc_add_mv(RV34DecContext *r, int dir, int val)
520 {
521  int mul = dir ? -r->mv_weight2 : r->mv_weight1;
522 
523  return (val * mul + 0x2000) >> 14;
524 }
525 
526 /**
527  * Predict motion vector for B-frame macroblock.
528  */
529 static inline void rv34_pred_b_vector(int A[2], int B[2], int C[2],
530  int A_avail, int B_avail, int C_avail,
531  int *mx, int *my)
532 {
533  if(A_avail + B_avail + C_avail != 3){
534  *mx = A[0] + B[0] + C[0];
535  *my = A[1] + B[1] + C[1];
536  if(A_avail + B_avail + C_avail == 2){
537  *mx /= 2;
538  *my /= 2;
539  }
540  }else{
541  *mx = mid_pred(A[0], B[0], C[0]);
542  *my = mid_pred(A[1], B[1], C[1]);
543  }
544 }
545 
546 /**
547  * motion vector prediction for B-frames
548  */
549 static void rv34_pred_mv_b(RV34DecContext *r, int block_type, int dir)
550 {
551  MpegEncContext *s = &r->s;
552  int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
553  int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
554  int A[2] = { 0 }, B[2] = { 0 }, C[2] = { 0 };
555  int has_A = 0, has_B = 0, has_C = 0;
556  int mx, my;
557  int i, j;
558  Picture *cur_pic = s->current_picture_ptr;
559  const int mask = dir ? MB_TYPE_L1 : MB_TYPE_L0;
560  int type = cur_pic->mb_type[mb_pos];
561 
562  if((r->avail_cache[6-1] & type) & mask){
563  A[0] = cur_pic->motion_val[dir][mv_pos - 1][0];
564  A[1] = cur_pic->motion_val[dir][mv_pos - 1][1];
565  has_A = 1;
566  }
567  if((r->avail_cache[6-4] & type) & mask){
568  B[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][0];
569  B[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride][1];
570  has_B = 1;
571  }
572  if(r->avail_cache[6-4] && (r->avail_cache[6-2] & type) & mask){
573  C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][0];
574  C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride + 2][1];
575  has_C = 1;
576  }else if((s->mb_x+1) == s->mb_width && (r->avail_cache[6-5] & type) & mask){
577  C[0] = cur_pic->motion_val[dir][mv_pos - s->b8_stride - 1][0];
578  C[1] = cur_pic->motion_val[dir][mv_pos - s->b8_stride - 1][1];
579  has_C = 1;
580  }
581 
582  rv34_pred_b_vector(A, B, C, has_A, has_B, has_C, &mx, &my);
583 
584  mx += r->dmv[dir][0];
585  my += r->dmv[dir][1];
586 
587  for(j = 0; j < 2; j++){
588  for(i = 0; i < 2; i++){
589  cur_pic->motion_val[dir][mv_pos + i + j*s->b8_stride][0] = mx;
590  cur_pic->motion_val[dir][mv_pos + i + j*s->b8_stride][1] = my;
591  }
592  }
593  if(block_type == RV34_MB_B_BACKWARD || block_type == RV34_MB_B_FORWARD){
594  ZERO8x2(cur_pic->motion_val[!dir][mv_pos], s->b8_stride);
595  }
596 }
597 
598 /**
599  * motion vector prediction - RV3 version
600  */
601 static void rv34_pred_mv_rv3(RV34DecContext *r, int block_type, int dir)
602 {
603  MpegEncContext *s = &r->s;
604  int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
605  int A[2] = {0}, B[2], C[2];
606  int i, j, k;
607  int mx, my;
608  int* avail = r->avail_cache + avail_indexes[0];
609 
610  if(avail[-1]){
611  A[0] = s->current_picture_ptr->motion_val[0][mv_pos - 1][0];
612  A[1] = s->current_picture_ptr->motion_val[0][mv_pos - 1][1];
613  }
614  if(avail[-4]){
615  B[0] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride][0];
616  B[1] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride][1];
617  }else{
618  B[0] = A[0];
619  B[1] = A[1];
620  }
621  if(!avail[-4 + 2]){
622  if(avail[-4] && (avail[-1])){
623  C[0] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride - 1][0];
624  C[1] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride - 1][1];
625  }else{
626  C[0] = A[0];
627  C[1] = A[1];
628  }
629  }else{
630  C[0] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride + 2][0];
631  C[1] = s->current_picture_ptr->motion_val[0][mv_pos - s->b8_stride + 2][1];
632  }
633  mx = mid_pred(A[0], B[0], C[0]);
634  my = mid_pred(A[1], B[1], C[1]);
635  mx += r->dmv[0][0];
636  my += r->dmv[0][1];
637  for(j = 0; j < 2; j++){
638  for(i = 0; i < 2; i++){
639  for(k = 0; k < 2; k++){
640  s->current_picture_ptr->motion_val[k][mv_pos + i + j*s->b8_stride][0] = mx;
641  s->current_picture_ptr->motion_val[k][mv_pos + i + j*s->b8_stride][1] = my;
642  }
643  }
644  }
645 }
646 
647 static const int chroma_coeffs[3] = { 0, 3, 5 };
648 
649 /**
650  * generic motion compensation function
651  *
652  * @param r decoder context
653  * @param block_type type of the current block
654  * @param xoff horizontal offset from the start of the current block
655  * @param yoff vertical offset from the start of the current block
656  * @param mv_off offset to the motion vector information
657  * @param width width of the current partition in 8x8 blocks
658  * @param height height of the current partition in 8x8 blocks
659  * @param dir motion compensation direction (i.e. from the last or the next reference frame)
660  * @param thirdpel motion vectors are specified in 1/3 of pixel
661  * @param qpel_mc a set of functions used to perform luma motion compensation
662  * @param chroma_mc a set of functions used to perform chroma motion compensation
663  */
664 static inline void rv34_mc(RV34DecContext *r, const int block_type,
665  const int xoff, const int yoff, int mv_off,
666  const int width, const int height, int dir,
667  const int thirdpel, int weighted,
668  qpel_mc_func (*qpel_mc)[16],
669  h264_chroma_mc_func (*chroma_mc))
670 {
671  MpegEncContext *s = &r->s;
672  uint8_t *Y, *U, *V, *srcY, *srcU, *srcV;
673  int dxy, mx, my, umx, umy, lx, ly, uvmx, uvmy, src_x, src_y, uvsrc_x, uvsrc_y;
674  int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride + mv_off;
675  int is16x16 = 1;
676  int emu = 0;
677 
678  if(thirdpel){
679  int chroma_mx, chroma_my;
680  mx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + (3 << 24)) / 3 - (1 << 24);
681  my = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + (3 << 24)) / 3 - (1 << 24);
682  lx = (s->current_picture_ptr->motion_val[dir][mv_pos][0] + (3 << 24)) % 3;
683  ly = (s->current_picture_ptr->motion_val[dir][mv_pos][1] + (3 << 24)) % 3;
684  chroma_mx = s->current_picture_ptr->motion_val[dir][mv_pos][0] / 2;
685  chroma_my = s->current_picture_ptr->motion_val[dir][mv_pos][1] / 2;
686  umx = (chroma_mx + (3 << 24)) / 3 - (1 << 24);
687  umy = (chroma_my + (3 << 24)) / 3 - (1 << 24);
688  uvmx = chroma_coeffs[(chroma_mx + (3 << 24)) % 3];
689  uvmy = chroma_coeffs[(chroma_my + (3 << 24)) % 3];
690  }else{
691  int cx, cy;
692  mx = s->current_picture_ptr->motion_val[dir][mv_pos][0] >> 2;
693  my = s->current_picture_ptr->motion_val[dir][mv_pos][1] >> 2;
694  lx = s->current_picture_ptr->motion_val[dir][mv_pos][0] & 3;
695  ly = s->current_picture_ptr->motion_val[dir][mv_pos][1] & 3;
696  cx = s->current_picture_ptr->motion_val[dir][mv_pos][0] / 2;
697  cy = s->current_picture_ptr->motion_val[dir][mv_pos][1] / 2;
698  umx = cx >> 2;
699  umy = cy >> 2;
700  uvmx = (cx & 3) << 1;
701  uvmy = (cy & 3) << 1;
702  //due to some flaw RV40 uses the same MC compensation routine for H2V2 and H3V3
703  if(uvmx == 6 && uvmy == 6)
704  uvmx = uvmy = 4;
705  }
706 
707  if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME)) {
708  /* wait for the referenced mb row to be finished */
709  int mb_row = s->mb_y + ((yoff + my + 5 + 8 * height) >> 4);
710  ThreadFrame *f = dir ? &s->next_picture_ptr->tf : &s->last_picture_ptr->tf;
711  ff_thread_await_progress(f, mb_row, 0);
712  }
713 
714  dxy = ly*4 + lx;
715  srcY = dir ? s->next_picture_ptr->f->data[0] : s->last_picture_ptr->f->data[0];
716  srcU = dir ? s->next_picture_ptr->f->data[1] : s->last_picture_ptr->f->data[1];
717  srcV = dir ? s->next_picture_ptr->f->data[2] : s->last_picture_ptr->f->data[2];
718  src_x = s->mb_x * 16 + xoff + mx;
719  src_y = s->mb_y * 16 + yoff + my;
720  uvsrc_x = s->mb_x * 8 + (xoff >> 1) + umx;
721  uvsrc_y = s->mb_y * 8 + (yoff >> 1) + umy;
722  srcY += src_y * s->linesize + src_x;
723  srcU += uvsrc_y * s->uvlinesize + uvsrc_x;
724  srcV += uvsrc_y * s->uvlinesize + uvsrc_x;
725  if(s->h_edge_pos - (width << 3) < 6 || s->v_edge_pos - (height << 3) < 6 ||
726  (unsigned)(src_x - !!lx*2) > s->h_edge_pos - !!lx*2 - (width <<3) - 4 ||
727  (unsigned)(src_y - !!ly*2) > s->v_edge_pos - !!ly*2 - (height<<3) - 4) {
728  srcY -= 2 + 2*s->linesize;
729  s->vdsp.emulated_edge_mc(s->edge_emu_buffer, srcY,
730  s->linesize, s->linesize,
731  (width << 3) + 6, (height << 3) + 6,
732  src_x - 2, src_y - 2,
733  s->h_edge_pos, s->v_edge_pos);
734  srcY = s->edge_emu_buffer + 2 + 2*s->linesize;
735  emu = 1;
736  }
737  if(!weighted){
738  Y = s->dest[0] + xoff + yoff *s->linesize;
739  U = s->dest[1] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
740  V = s->dest[2] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
741  }else{
742  Y = r->tmp_b_block_y [dir] + xoff + yoff *s->linesize;
743  U = r->tmp_b_block_uv[dir*2] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
744  V = r->tmp_b_block_uv[dir*2+1] + (xoff>>1) + (yoff>>1)*s->uvlinesize;
745  }
746 
747  if(block_type == RV34_MB_P_16x8){
748  qpel_mc[1][dxy](Y, srcY, s->linesize);
749  Y += 8;
750  srcY += 8;
751  }else if(block_type == RV34_MB_P_8x16){
752  qpel_mc[1][dxy](Y, srcY, s->linesize);
753  Y += 8 * s->linesize;
754  srcY += 8 * s->linesize;
755  }
756  is16x16 = (block_type != RV34_MB_P_8x8) && (block_type != RV34_MB_P_16x8) && (block_type != RV34_MB_P_8x16);
757  qpel_mc[!is16x16][dxy](Y, srcY, s->linesize);
758  if (emu) {
759  uint8_t *uvbuf = s->edge_emu_buffer;
760 
761  s->vdsp.emulated_edge_mc(uvbuf, srcU,
762  s->uvlinesize, s->uvlinesize,
763  (width << 2) + 1, (height << 2) + 1,
764  uvsrc_x, uvsrc_y,
765  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
766  srcU = uvbuf;
767  uvbuf += 9*s->uvlinesize;
768 
769  s->vdsp.emulated_edge_mc(uvbuf, srcV,
770  s->uvlinesize, s->uvlinesize,
771  (width << 2) + 1, (height << 2) + 1,
772  uvsrc_x, uvsrc_y,
773  s->h_edge_pos >> 1, s->v_edge_pos >> 1);
774  srcV = uvbuf;
775  }
776  chroma_mc[2-width] (U, srcU, s->uvlinesize, height*4, uvmx, uvmy);
777  chroma_mc[2-width] (V, srcV, s->uvlinesize, height*4, uvmx, uvmy);
778 }
779 
780 static void rv34_mc_1mv(RV34DecContext *r, const int block_type,
781  const int xoff, const int yoff, int mv_off,
782  const int width, const int height, int dir)
783 {
784  rv34_mc(r, block_type, xoff, yoff, mv_off, width, height, dir, r->rv30, 0,
785  r->rdsp.put_pixels_tab,
786  r->rdsp.put_chroma_pixels_tab);
787 }
788 
789 static void rv4_weight(RV34DecContext *r)
790 {
791  r->rdsp.rv40_weight_pixels_tab[r->scaled_weight][0](r->s.dest[0],
792  r->tmp_b_block_y[0],
793  r->tmp_b_block_y[1],
794  r->weight1,
795  r->weight2,
796  r->s.linesize);
797  r->rdsp.rv40_weight_pixels_tab[r->scaled_weight][1](r->s.dest[1],
798  r->tmp_b_block_uv[0],
799  r->tmp_b_block_uv[2],
800  r->weight1,
801  r->weight2,
802  r->s.uvlinesize);
803  r->rdsp.rv40_weight_pixels_tab[r->scaled_weight][1](r->s.dest[2],
804  r->tmp_b_block_uv[1],
805  r->tmp_b_block_uv[3],
806  r->weight1,
807  r->weight2,
808  r->s.uvlinesize);
809 }
810 
811 static void rv34_mc_2mv(RV34DecContext *r, const int block_type)
812 {
813  int weighted = !r->rv30 && block_type != RV34_MB_B_BIDIR && r->weight1 != 8192;
814 
815  rv34_mc(r, block_type, 0, 0, 0, 2, 2, 0, r->rv30, weighted,
816  r->rdsp.put_pixels_tab,
817  r->rdsp.put_chroma_pixels_tab);
818  if(!weighted){
819  rv34_mc(r, block_type, 0, 0, 0, 2, 2, 1, r->rv30, 0,
820  r->rdsp.avg_pixels_tab,
821  r->rdsp.avg_chroma_pixels_tab);
822  }else{
823  rv34_mc(r, block_type, 0, 0, 0, 2, 2, 1, r->rv30, 1,
824  r->rdsp.put_pixels_tab,
825  r->rdsp.put_chroma_pixels_tab);
826  rv4_weight(r);
827  }
828 }
829 
830 static void rv34_mc_2mv_skip(RV34DecContext *r)
831 {
832  int i, j;
833  int weighted = !r->rv30 && r->weight1 != 8192;
834 
835  for(j = 0; j < 2; j++)
836  for(i = 0; i < 2; i++){
837  rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 0, r->rv30,
838  weighted,
839  r->rdsp.put_pixels_tab,
840  r->rdsp.put_chroma_pixels_tab);
841  rv34_mc(r, RV34_MB_P_8x8, i*8, j*8, i+j*r->s.b8_stride, 1, 1, 1, r->rv30,
842  weighted,
843  weighted ? r->rdsp.put_pixels_tab : r->rdsp.avg_pixels_tab,
844  weighted ? r->rdsp.put_chroma_pixels_tab : r->rdsp.avg_chroma_pixels_tab);
845  }
846  if(weighted)
847  rv4_weight(r);
848 }
849 
850 /** number of motion vectors in each macroblock type */
851 static const int num_mvs[RV34_MB_TYPES] = { 0, 0, 1, 4, 1, 1, 0, 0, 2, 2, 2, 1 };
852 
853 /**
854  * Decode motion vector differences
855  * and perform motion vector reconstruction and motion compensation.
856  */
857 static int rv34_decode_mv(RV34DecContext *r, int block_type)
858 {
859  MpegEncContext *s = &r->s;
860  GetBitContext *gb = &s->gb;
861  int i, j, k, l;
862  int mv_pos = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
863  int next_bt;
864 
865  memset(r->dmv, 0, sizeof(r->dmv));
866  for(i = 0; i < num_mvs[block_type]; i++){
867  r->dmv[i][0] = svq3_get_se_golomb(gb);
868  r->dmv[i][1] = svq3_get_se_golomb(gb);
869  }
870  switch(block_type){
871  case RV34_MB_TYPE_INTRA:
872  case RV34_MB_TYPE_INTRA16x16:
873  ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
874  return 0;
875  case RV34_MB_SKIP:
876  if(s->pict_type == AV_PICTURE_TYPE_P){
877  ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
878  rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);
879  break;
880  }
881  case RV34_MB_B_DIRECT:
882  //surprisingly, it uses motion scheme from next reference frame
883  /* wait for the current mb row to be finished */
884  if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))
885  ff_thread_await_progress(&s->next_picture_ptr->tf, FFMAX(0, s->mb_y-1), 0);
886 
887  next_bt = s->next_picture_ptr->mb_type[s->mb_x + s->mb_y * s->mb_stride];
888  if(IS_INTRA(next_bt) || IS_SKIP(next_bt)){
889  ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
890  ZERO8x2(s->current_picture_ptr->motion_val[1][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
891  }else
892  for(j = 0; j < 2; j++)
893  for(i = 0; i < 2; i++)
894  for(k = 0; k < 2; k++)
895  for(l = 0; l < 2; l++)
896  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]);
897  if(!(IS_16X8(next_bt) || IS_8X16(next_bt) || IS_8X8(next_bt))) //we can use whole macroblock MC
898  rv34_mc_2mv(r, block_type);
899  else
900  rv34_mc_2mv_skip(r);
901  ZERO8x2(s->current_picture_ptr->motion_val[0][s->mb_x * 2 + s->mb_y * 2 * s->b8_stride], s->b8_stride);
902  break;
903  case RV34_MB_P_16x16:
904  case RV34_MB_P_MIX16x16:
905  rv34_pred_mv(r, block_type, 0, 0);
906  rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, 0);
907  break;
908  case RV34_MB_B_FORWARD:
909  case RV34_MB_B_BACKWARD:
910  r->dmv[1][0] = r->dmv[0][0];
911  r->dmv[1][1] = r->dmv[0][1];
912  if(r->rv30)
913  rv34_pred_mv_rv3(r, block_type, block_type == RV34_MB_B_BACKWARD);
914  else
915  rv34_pred_mv_b (r, block_type, block_type == RV34_MB_B_BACKWARD);
916  rv34_mc_1mv (r, block_type, 0, 0, 0, 2, 2, block_type == RV34_MB_B_BACKWARD);
917  break;
918  case RV34_MB_P_16x8:
919  case RV34_MB_P_8x16:
920  rv34_pred_mv(r, block_type, 0, 0);
921  rv34_pred_mv(r, block_type, 1 + (block_type == RV34_MB_P_16x8), 1);
922  if(block_type == RV34_MB_P_16x8){
923  rv34_mc_1mv(r, block_type, 0, 0, 0, 2, 1, 0);
924  rv34_mc_1mv(r, block_type, 0, 8, s->b8_stride, 2, 1, 0);
925  }
926  if(block_type == RV34_MB_P_8x16){
927  rv34_mc_1mv(r, block_type, 0, 0, 0, 1, 2, 0);
928  rv34_mc_1mv(r, block_type, 8, 0, 1, 1, 2, 0);
929  }
930  break;
931  case RV34_MB_B_BIDIR:
932  rv34_pred_mv_b (r, block_type, 0);
933  rv34_pred_mv_b (r, block_type, 1);
934  rv34_mc_2mv (r, block_type);
935  break;
936  case RV34_MB_P_8x8:
937  for(i=0;i< 4;i++){
938  rv34_pred_mv(r, block_type, i, i);
939  rv34_mc_1mv (r, block_type, (i&1)<<3, (i&2)<<2, (i&1)+(i>>1)*s->b8_stride, 1, 1, 0);
940  }
941  break;
942  }
943 
944  return 0;
945 }
946 /** @} */ // mv group
947 
948 /**
949  * @name Macroblock reconstruction functions
950  * @{
951  */
952 /** mapping of RV30/40 intra prediction types to standard H.264 types */
953 static const int ittrans[9] = {
954  DC_PRED, VERT_PRED, HOR_PRED, DIAG_DOWN_RIGHT_PRED, DIAG_DOWN_LEFT_PRED,
955  VERT_RIGHT_PRED, VERT_LEFT_PRED, HOR_UP_PRED, HOR_DOWN_PRED,
956 };
957 
958 /** mapping of RV30/40 intra 16x16 prediction types to standard H.264 types */
959 static const int ittrans16[4] = {
960  DC_PRED8x8, VERT_PRED8x8, HOR_PRED8x8, PLANE_PRED8x8,
961 };
962 
963 /**
964  * Perform 4x4 intra prediction.
965  */
966 static void rv34_pred_4x4_block(RV34DecContext *r, uint8_t *dst, int stride, int itype, int up, int left, int down, int right)
967 {
968  uint8_t *prev = dst - stride + 4;
969  uint32_t topleft;
970 
971  if(!up && !left)
972  itype = DC_128_PRED;
973  else if(!up){
974  if(itype == VERT_PRED) itype = HOR_PRED;
975  if(itype == DC_PRED) itype = LEFT_DC_PRED;
976  }else if(!left){
977  if(itype == HOR_PRED) itype = VERT_PRED;
978  if(itype == DC_PRED) itype = TOP_DC_PRED;
979  if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;
980  }
981  if(!down){
982  if(itype == DIAG_DOWN_LEFT_PRED) itype = DIAG_DOWN_LEFT_PRED_RV40_NODOWN;
983  if(itype == HOR_UP_PRED) itype = HOR_UP_PRED_RV40_NODOWN;
984  if(itype == VERT_LEFT_PRED) itype = VERT_LEFT_PRED_RV40_NODOWN;
985  }
986  if(!right && up){
987  topleft = dst[-stride + 3] * 0x01010101u;
988  prev = (uint8_t*)&topleft;
989  }
990  r->h.pred4x4[itype](dst, prev, stride);
991 }
992 
993 static inline int adjust_pred16(int itype, int up, int left)
994 {
995  if(!up && !left)
996  itype = DC_128_PRED8x8;
997  else if(!up){
998  if(itype == PLANE_PRED8x8)itype = HOR_PRED8x8;
999  if(itype == VERT_PRED8x8) itype = HOR_PRED8x8;
1000  if(itype == DC_PRED8x8) itype = LEFT_DC_PRED8x8;
1001  }else if(!left){
1002  if(itype == PLANE_PRED8x8)itype = VERT_PRED8x8;
1003  if(itype == HOR_PRED8x8) itype = VERT_PRED8x8;
1004  if(itype == DC_PRED8x8) itype = TOP_DC_PRED8x8;
1005  }
1006  return itype;
1007 }
1008 
1009 static inline void rv34_process_block(RV34DecContext *r,
1010  uint8_t *pdst, int stride,
1011  int fc, int sc, int q_dc, int q_ac)
1012 {
1013  MpegEncContext *s = &r->s;
1014  int16_t *ptr = s->block[0];
1015  int has_ac = rv34_decode_block(ptr, &s->gb, r->cur_vlcs,
1016  fc, sc, q_dc, q_ac, q_ac);
1017  if(has_ac){
1018  r->rdsp.rv34_idct_add(pdst, stride, ptr);
1019  }else{
1020  r->rdsp.rv34_idct_dc_add(pdst, stride, ptr[0]);
1021  ptr[0] = 0;
1022  }
1023 }
1024 
1025 static void rv34_output_i16x16(RV34DecContext *r, int8_t *intra_types, int cbp)
1026 {
1027  LOCAL_ALIGNED_16(int16_t, block16, [16]);
1028  MpegEncContext *s = &r->s;
1029  GetBitContext *gb = &s->gb;
1030  int q_dc = rv34_qscale_tab[ r->luma_dc_quant_i[s->qscale] ],
1031  q_ac = rv34_qscale_tab[s->qscale];
1032  uint8_t *dst = s->dest[0];
1033  int16_t *ptr = s->block[0];
1034  int i, j, itype, has_ac;
1035 
1036  memset(block16, 0, 16 * sizeof(*block16));
1037 
1038  has_ac = rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0, q_dc, q_dc, q_ac);
1039  if(has_ac)
1040  r->rdsp.rv34_inv_transform(block16);
1041  else
1042  r->rdsp.rv34_inv_transform_dc(block16);
1043 
1044  itype = ittrans16[intra_types[0]];
1045  itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);
1046  r->h.pred16x16[itype](dst, s->linesize);
1047 
1048  for(j = 0; j < 4; j++){
1049  for(i = 0; i < 4; i++, cbp >>= 1){
1050  int dc = block16[i + j*4];
1051 
1052  if(cbp & 1){
1053  has_ac = rv34_decode_block(ptr, gb, r->cur_vlcs, r->luma_vlc, 0, q_ac, q_ac, q_ac);
1054  }else
1055  has_ac = 0;
1056 
1057  if(has_ac){
1058  ptr[0] = dc;
1059  r->rdsp.rv34_idct_add(dst+4*i, s->linesize, ptr);
1060  }else
1061  r->rdsp.rv34_idct_dc_add(dst+4*i, s->linesize, dc);
1062  }
1063 
1064  dst += 4*s->linesize;
1065  }
1066 
1067  itype = ittrans16[intra_types[0]];
1068  if(itype == PLANE_PRED8x8) itype = DC_PRED8x8;
1069  itype = adjust_pred16(itype, r->avail_cache[6-4], r->avail_cache[6-1]);
1070 
1071  q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];
1072  q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];
1073 
1074  for(j = 1; j < 3; j++){
1075  dst = s->dest[j];
1076  r->h.pred8x8[itype](dst, s->uvlinesize);
1077  for(i = 0; i < 4; i++, cbp >>= 1){
1078  uint8_t *pdst;
1079  if(!(cbp & 1)) continue;
1080  pdst = dst + (i&1)*4 + (i&2)*2*s->uvlinesize;
1081 
1082  rv34_process_block(r, pdst, s->uvlinesize,
1083  r->chroma_vlc, 1, q_dc, q_ac);
1084  }
1085  }
1086 }
1087 
1088 static void rv34_output_intra(RV34DecContext *r, int8_t *intra_types, int cbp)
1089 {
1090  MpegEncContext *s = &r->s;
1091  uint8_t *dst = s->dest[0];
1092  int avail[6*8] = {0};
1093  int i, j, k;
1094  int idx, q_ac, q_dc;
1095 
1096  // Set neighbour information.
1097  if(r->avail_cache[1])
1098  avail[0] = 1;
1099  if(r->avail_cache[2])
1100  avail[1] = avail[2] = 1;
1101  if(r->avail_cache[3])
1102  avail[3] = avail[4] = 1;
1103  if(r->avail_cache[4])
1104  avail[5] = 1;
1105  if(r->avail_cache[5])
1106  avail[8] = avail[16] = 1;
1107  if(r->avail_cache[9])
1108  avail[24] = avail[32] = 1;
1109 
1110  q_ac = rv34_qscale_tab[s->qscale];
1111  for(j = 0; j < 4; j++){
1112  idx = 9 + j*8;
1113  for(i = 0; i < 4; i++, cbp >>= 1, dst += 4, idx++){
1114  rv34_pred_4x4_block(r, dst, s->linesize, ittrans[intra_types[i]], avail[idx-8], avail[idx-1], avail[idx+7], avail[idx-7]);
1115  avail[idx] = 1;
1116  if(!(cbp & 1)) continue;
1117 
1118  rv34_process_block(r, dst, s->linesize,
1119  r->luma_vlc, 0, q_ac, q_ac);
1120  }
1121  dst += s->linesize * 4 - 4*4;
1122  intra_types += r->intra_types_stride;
1123  }
1124 
1125  intra_types -= r->intra_types_stride * 4;
1126 
1127  q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];
1128  q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];
1129 
1130  for(k = 0; k < 2; k++){
1131  dst = s->dest[1+k];
1132  fill_rectangle(r->avail_cache + 6, 2, 2, 4, 0, 4);
1133 
1134  for(j = 0; j < 2; j++){
1135  int* acache = r->avail_cache + 6 + j*4;
1136  for(i = 0; i < 2; i++, cbp >>= 1, acache++){
1137  int itype = ittrans[intra_types[i*2+j*2*r->intra_types_stride]];
1138  rv34_pred_4x4_block(r, dst+4*i, s->uvlinesize, itype, acache[-4], acache[-1], !i && !j, acache[-3]);
1139  acache[0] = 1;
1140 
1141  if(!(cbp&1)) continue;
1142 
1143  rv34_process_block(r, dst + 4*i, s->uvlinesize,
1144  r->chroma_vlc, 1, q_dc, q_ac);
1145  }
1146 
1147  dst += 4*s->uvlinesize;
1148  }
1149  }
1150 }
1151 
1152 static int is_mv_diff_gt_3(int16_t (*motion_val)[2], int step)
1153 {
1154  int d;
1155  d = motion_val[0][0] - motion_val[-step][0];
1156  if(d < -3 || d > 3)
1157  return 1;
1158  d = motion_val[0][1] - motion_val[-step][1];
1159  if(d < -3 || d > 3)
1160  return 1;
1161  return 0;
1162 }
1163 
1164 static int rv34_set_deblock_coef(RV34DecContext *r)
1165 {
1166  MpegEncContext *s = &r->s;
1167  int hmvmask = 0, vmvmask = 0, i, j;
1168  int midx = s->mb_x * 2 + s->mb_y * 2 * s->b8_stride;
1169  int16_t (*motion_val)[2] = &s->current_picture_ptr->motion_val[0][midx];
1170  for(j = 0; j < 16; j += 8){
1171  for(i = 0; i < 2; i++){
1172  if(is_mv_diff_gt_3(motion_val + i, 1))
1173  vmvmask |= 0x11 << (j + i*2);
1174  if((j || s->mb_y) && is_mv_diff_gt_3(motion_val + i, s->b8_stride))
1175  hmvmask |= 0x03 << (j + i*2);
1176  }
1177  motion_val += s->b8_stride;
1178  }
1179  if(s->first_slice_line)
1180  hmvmask &= ~0x000F;
1181  if(!s->mb_x)
1182  vmvmask &= ~0x1111;
1183  if(r->rv30){ //RV30 marks both subblocks on the edge for filtering
1184  vmvmask |= (vmvmask & 0x4444) >> 1;
1185  hmvmask |= (hmvmask & 0x0F00) >> 4;
1186  if(s->mb_x)
1187  r->deblock_coefs[s->mb_x - 1 + s->mb_y*s->mb_stride] |= (vmvmask & 0x1111) << 3;
1188  if(!s->first_slice_line)
1189  r->deblock_coefs[s->mb_x + (s->mb_y - 1)*s->mb_stride] |= (hmvmask & 0xF) << 12;
1190  }
1191  return hmvmask | vmvmask;
1192 }
1193 
1194 static int rv34_decode_inter_macroblock(RV34DecContext *r, int8_t *intra_types)
1195 {
1196  MpegEncContext *s = &r->s;
1197  GetBitContext *gb = &s->gb;
1198  uint8_t *dst = s->dest[0];
1199  int16_t *ptr = s->block[0];
1200  int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1201  int cbp, cbp2;
1202  int q_dc, q_ac, has_ac;
1203  int i, j;
1204  int dist;
1205 
1206  // Calculate which neighbours are available. Maybe it's worth optimizing too.
1207  memset(r->avail_cache, 0, sizeof(r->avail_cache));
1208  fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);
1209  dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;
1210  if(s->mb_x && dist)
1211  r->avail_cache[5] =
1212  r->avail_cache[9] = s->current_picture_ptr->mb_type[mb_pos - 1];
1213  if(dist >= s->mb_width)
1214  r->avail_cache[2] =
1215  r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];
1216  if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)
1217  r->avail_cache[4] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];
1218  if(s->mb_x && dist > s->mb_width)
1219  r->avail_cache[1] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];
1220 
1221  s->qscale = r->si.quant;
1222  cbp = cbp2 = rv34_decode_inter_mb_header(r, intra_types);
1223  r->cbp_luma [mb_pos] = cbp;
1224  r->cbp_chroma[mb_pos] = cbp >> 16;
1225  r->deblock_coefs[mb_pos] = rv34_set_deblock_coef(r) | r->cbp_luma[mb_pos];
1226  s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;
1227 
1228  if(cbp == -1)
1229  return -1;
1230 
1231  if (IS_INTRA(s->current_picture_ptr->mb_type[mb_pos])){
1232  if(r->is16) rv34_output_i16x16(r, intra_types, cbp);
1233  else rv34_output_intra(r, intra_types, cbp);
1234  return 0;
1235  }
1236 
1237  if(r->is16){
1238  // Only for RV34_MB_P_MIX16x16
1239  LOCAL_ALIGNED_16(int16_t, block16, [16]);
1240  memset(block16, 0, 16 * sizeof(*block16));
1241  q_dc = rv34_qscale_tab[ r->luma_dc_quant_p[s->qscale] ];
1242  q_ac = rv34_qscale_tab[s->qscale];
1243  if (rv34_decode_block(block16, gb, r->cur_vlcs, 3, 0, q_dc, q_dc, q_ac))
1244  r->rdsp.rv34_inv_transform(block16);
1245  else
1246  r->rdsp.rv34_inv_transform_dc(block16);
1247 
1248  q_ac = rv34_qscale_tab[s->qscale];
1249 
1250  for(j = 0; j < 4; j++){
1251  for(i = 0; i < 4; i++, cbp >>= 1){
1252  int dc = block16[i + j*4];
1253 
1254  if(cbp & 1){
1255  has_ac = rv34_decode_block(ptr, gb, r->cur_vlcs, r->luma_vlc, 0, q_ac, q_ac, q_ac);
1256  }else
1257  has_ac = 0;
1258 
1259  if(has_ac){
1260  ptr[0] = dc;
1261  r->rdsp.rv34_idct_add(dst+4*i, s->linesize, ptr);
1262  }else
1263  r->rdsp.rv34_idct_dc_add(dst+4*i, s->linesize, dc);
1264  }
1265 
1266  dst += 4*s->linesize;
1267  }
1268 
1269  r->cur_vlcs = choose_vlc_set(r->si.quant, r->si.vlc_set, 1);
1270  }else{
1271  q_ac = rv34_qscale_tab[s->qscale];
1272 
1273  for(j = 0; j < 4; j++){
1274  for(i = 0; i < 4; i++, cbp >>= 1){
1275  if(!(cbp & 1)) continue;
1276 
1277  rv34_process_block(r, dst + 4*i, s->linesize,
1278  r->luma_vlc, 0, q_ac, q_ac);
1279  }
1280  dst += 4*s->linesize;
1281  }
1282  }
1283 
1284  q_dc = rv34_qscale_tab[rv34_chroma_quant[1][s->qscale]];
1285  q_ac = rv34_qscale_tab[rv34_chroma_quant[0][s->qscale]];
1286 
1287  for(j = 1; j < 3; j++){
1288  dst = s->dest[j];
1289  for(i = 0; i < 4; i++, cbp >>= 1){
1290  uint8_t *pdst;
1291  if(!(cbp & 1)) continue;
1292  pdst = dst + (i&1)*4 + (i&2)*2*s->uvlinesize;
1293 
1294  rv34_process_block(r, pdst, s->uvlinesize,
1295  r->chroma_vlc, 1, q_dc, q_ac);
1296  }
1297  }
1298 
1299  return 0;
1300 }
1301 
1302 static int rv34_decode_intra_macroblock(RV34DecContext *r, int8_t *intra_types)
1303 {
1304  MpegEncContext *s = &r->s;
1305  int cbp, dist;
1306  int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
1307 
1308  // Calculate which neighbours are available. Maybe it's worth optimizing too.
1309  memset(r->avail_cache, 0, sizeof(r->avail_cache));
1310  fill_rectangle(r->avail_cache + 6, 2, 2, 4, 1, 4);
1311  dist = (s->mb_x - s->resync_mb_x) + (s->mb_y - s->resync_mb_y) * s->mb_width;
1312  if(s->mb_x && dist)
1313  r->avail_cache[5] =
1314  r->avail_cache[9] = s->current_picture_ptr->mb_type[mb_pos - 1];
1315  if(dist >= s->mb_width)
1316  r->avail_cache[2] =
1317  r->avail_cache[3] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride];
1318  if(((s->mb_x+1) < s->mb_width) && dist >= s->mb_width - 1)
1319  r->avail_cache[4] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride + 1];
1320  if(s->mb_x && dist > s->mb_width)
1321  r->avail_cache[1] = s->current_picture_ptr->mb_type[mb_pos - s->mb_stride - 1];
1322 
1323  s->qscale = r->si.quant;
1324  cbp = rv34_decode_intra_mb_header(r, intra_types);
1325  r->cbp_luma [mb_pos] = cbp;
1326  r->cbp_chroma[mb_pos] = cbp >> 16;
1327  r->deblock_coefs[mb_pos] = 0xFFFF;
1328  s->current_picture_ptr->qscale_table[mb_pos] = s->qscale;
1329 
1330  if(cbp == -1)
1331  return -1;
1332 
1333  if(r->is16){
1334  rv34_output_i16x16(r, intra_types, cbp);
1335  return 0;
1336  }
1337 
1338  rv34_output_intra(r, intra_types, cbp);
1339  return 0;
1340 }
1341 
1342 static int check_slice_end(RV34DecContext *r, MpegEncContext *s)
1343 {
1344  int bits;
1345  if(s->mb_y >= s->mb_height)
1346  return 1;
1347  if(!s->mb_num_left)
1348  return 1;
1349  if(r->s.mb_skip_run > 1)
1350  return 0;
1351  bits = get_bits_left(&s->gb);
1352  if(bits <= 0 || (bits < 8 && !show_bits(&s->gb, bits)))
1353  return 1;
1354  return 0;
1355 }
1356 
1357 
1358 static void rv34_decoder_free(RV34DecContext *r)
1359 {
1360  av_freep(&r->intra_types_hist);
1361  r->intra_types = NULL;
1362  av_freep(&r->tmp_b_block_base);
1363  av_freep(&r->mb_type);
1364  av_freep(&r->cbp_luma);
1365  av_freep(&r->cbp_chroma);
1366  av_freep(&r->deblock_coefs);
1367 }
1368 
1369 
1370 static int rv34_decoder_alloc(RV34DecContext *r)
1371 {
1372  r->intra_types_stride = r->s.mb_width * 4 + 4;
1373 
1374  r->cbp_chroma = av_mallocz(r->s.mb_stride * r->s.mb_height *
1375  sizeof(*r->cbp_chroma));
1376  r->cbp_luma = av_mallocz(r->s.mb_stride * r->s.mb_height *
1377  sizeof(*r->cbp_luma));
1378  r->deblock_coefs = av_mallocz(r->s.mb_stride * r->s.mb_height *
1379  sizeof(*r->deblock_coefs));
1380  r->intra_types_hist = av_malloc(r->intra_types_stride * 4 * 2 *
1381  sizeof(*r->intra_types_hist));
1382  r->mb_type = av_mallocz(r->s.mb_stride * r->s.mb_height *
1383  sizeof(*r->mb_type));
1384 
1385  if (!(r->cbp_chroma && r->cbp_luma && r->deblock_coefs &&
1386  r->intra_types_hist && r->mb_type)) {
1387  rv34_decoder_free(r);
1388  return AVERROR(ENOMEM);
1389  }
1390 
1391  r->intra_types = r->intra_types_hist + r->intra_types_stride * 4;
1392 
1393  return 0;
1394 }
1395 
1396 
1397 static int rv34_decoder_realloc(RV34DecContext *r)
1398 {
1399  rv34_decoder_free(r);
1400  return rv34_decoder_alloc(r);
1401 }
1402 
1403 
1404 static int rv34_decode_slice(RV34DecContext *r, int end, const uint8_t* buf, int buf_size)
1405 {
1406  MpegEncContext *s = &r->s;
1407  GetBitContext *gb = &s->gb;
1408  int mb_pos, slice_type;
1409  int res;
1410 
1411  init_get_bits(&r->s.gb, buf, buf_size*8);
1412  res = r->parse_slice_header(r, gb, &r->si);
1413  if(res < 0){
1414  av_log(s->avctx, AV_LOG_ERROR, "Incorrect or unknown slice header\n");
1415  return -1;
1416  }
1417 
1418  slice_type = r->si.type ? r->si.type : AV_PICTURE_TYPE_I;
1419  if (slice_type != s->pict_type) {
1420  av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");
1421  return AVERROR_INVALIDDATA;
1422  }
1423  if (s->width != r->si.width || s->height != r->si.height) {
1424  av_log(s->avctx, AV_LOG_ERROR, "Size mismatch\n");
1425  return AVERROR_INVALIDDATA;
1426  }
1427 
1428  r->si.end = end;
1429  s->qscale = r->si.quant;
1430  s->mb_num_left = r->si.end - r->si.start;
1431  r->s.mb_skip_run = 0;
1432 
1433  mb_pos = s->mb_x + s->mb_y * s->mb_width;
1434  if(r->si.start != mb_pos){
1435  av_log(s->avctx, AV_LOG_ERROR, "Slice indicates MB offset %d, got %d\n", r->si.start, mb_pos);
1436  s->mb_x = r->si.start % s->mb_width;
1437  s->mb_y = r->si.start / s->mb_width;
1438  }
1439  memset(r->intra_types_hist, -1, r->intra_types_stride * 4 * 2 * sizeof(*r->intra_types_hist));
1440  s->first_slice_line = 1;
1441  s->resync_mb_x = s->mb_x;
1442  s->resync_mb_y = s->mb_y;
1443 
1444  ff_init_block_index(s);
1445  while(!check_slice_end(r, s)) {
1446  ff_update_block_index(s);
1447 
1448  if(r->si.type)
1449  res = rv34_decode_inter_macroblock(r, r->intra_types + s->mb_x * 4 + 4);
1450  else
1451  res = rv34_decode_intra_macroblock(r, r->intra_types + s->mb_x * 4 + 4);
1452  if(res < 0){
1453  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_ERROR);
1454  return -1;
1455  }
1456  if (++s->mb_x == s->mb_width) {
1457  s->mb_x = 0;
1458  s->mb_y++;
1459  ff_init_block_index(s);
1460 
1461  memmove(r->intra_types_hist, r->intra_types, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));
1462  memset(r->intra_types, -1, r->intra_types_stride * 4 * sizeof(*r->intra_types_hist));
1463 
1464  if(r->loop_filter && s->mb_y >= 2)
1465  r->loop_filter(r, s->mb_y - 2);
1466 
1467  if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))
1468  ff_thread_report_progress(&s->current_picture_ptr->tf,
1469  s->mb_y - 2, 0);
1470 
1471  }
1472  if(s->mb_x == s->resync_mb_x)
1473  s->first_slice_line=0;
1474  s->mb_num_left--;
1475  }
1476  ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
1477 
1478  return s->mb_y == s->mb_height;
1479 }
1480 
1481 /** @} */ // recons group end
1482 
1483 /**
1484  * Initialize decoder.
1485  */
1486 av_cold int ff_rv34_decode_init(AVCodecContext *avctx)
1487 {
1488  RV34DecContext *r = avctx->priv_data;
1489  MpegEncContext *s = &r->s;
1490  int ret;
1491 
1492  ff_mpv_decode_defaults(s);
1493  ff_mpv_decode_init(s, avctx);
1494  s->out_format = FMT_H263;
1495 
1496  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
1497  avctx->has_b_frames = 1;
1498  s->low_delay = 0;
1499 
1500  ff_mpv_idct_init(s);
1501  if ((ret = ff_mpv_common_init(s)) < 0)
1502  return ret;
1503 
1504  ff_h264_pred_init(&r->h, AV_CODEC_ID_RV40, 8, 1);
1505 
1506 #if CONFIG_RV30_DECODER
1507  if (avctx->codec_id == AV_CODEC_ID_RV30)
1508  ff_rv30dsp_init(&r->rdsp);
1509 #endif
1510 #if CONFIG_RV40_DECODER
1511  if (avctx->codec_id == AV_CODEC_ID_RV40)
1512  ff_rv40dsp_init(&r->rdsp);
1513 #endif
1514 
1515  if ((ret = rv34_decoder_alloc(r)) < 0) {
1516  ff_mpv_common_end(&r->s);
1517  return ret;
1518  }
1519 
1520  if(!intra_vlcs[0].cbppattern[0].bits)
1521  rv34_init_tables();
1522 
1523  avctx->internal->allocate_progress = 1;
1524 
1525  return 0;
1526 }
1527 
1528 int ff_rv34_decode_init_thread_copy(AVCodecContext *avctx)
1529 {
1530  int err;
1531  RV34DecContext *r = avctx->priv_data;
1532 
1533  r->s.avctx = avctx;
1534 
1535  if (avctx->internal->is_copy) {
1536  r->tmp_b_block_base = NULL;
1537  ff_mpv_idct_init(&r->s);
1538  if ((err = ff_mpv_common_init(&r->s)) < 0)
1539  return err;
1540  if ((err = rv34_decoder_alloc(r)) < 0) {
1541  ff_mpv_common_end(&r->s);
1542  return err;
1543  }
1544  }
1545 
1546  return 0;
1547 }
1548 
1549 int ff_rv34_decode_update_thread_context(AVCodecContext *dst, const AVCodecContext *src)
1550 {
1551  RV34DecContext *r = dst->priv_data, *r1 = src->priv_data;
1552  MpegEncContext * const s = &r->s, * const s1 = &r1->s;
1553  int err;
1554 
1555  if (dst == src || !s1->context_initialized)
1556  return 0;
1557 
1558  if (s->height != s1->height || s->width != s1->width) {
1559  s->height = s1->height;
1560  s->width = s1->width;
1561  if ((err = ff_mpv_common_frame_size_change(s)) < 0)
1562  return err;
1563  if ((err = rv34_decoder_realloc(r)) < 0)
1564  return err;
1565  }
1566 
1567  r->cur_pts = r1->cur_pts;
1568  r->last_pts = r1->last_pts;
1569  r->next_pts = r1->next_pts;
1570 
1571  memset(&r->si, 0, sizeof(r->si));
1572 
1573  // Do no call ff_mpeg_update_thread_context on a partially initialized
1574  // decoder context.
1575  if (!s1->linesize)
1576  return 0;
1577 
1578  return ff_mpeg_update_thread_context(dst, src);
1579 }
1580 
1581 static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
1582 {
1583  if(avctx->slice_count) return avctx->slice_offset[n];
1584  else return AV_RL32(buf + n*8 - 4) == 1 ? AV_RL32(buf + n*8) : AV_RB32(buf + n*8);
1585 }
1586 
1587 static int finish_frame(AVCodecContext *avctx, AVFrame *pict)
1588 {
1589  RV34DecContext *r = avctx->priv_data;
1590  MpegEncContext *s = &r->s;
1591  int got_picture = 0, ret;
1592 
1593  ff_er_frame_end(&s->er);
1594  ff_mpv_frame_end(s);
1595  s->mb_num_left = 0;
1596 
1597  if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))
1598  ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX, 0);
1599 
1600  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
1601  if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
1602  return ret;
1603  ff_print_debug_info(s, s->current_picture_ptr, pict);
1604  ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
1605  got_picture = 1;
1606  } else if (s->last_picture_ptr) {
1607  if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
1608  return ret;
1609  ff_print_debug_info(s, s->last_picture_ptr, pict);
1610  ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
1611  got_picture = 1;
1612  }
1613 
1614  return got_picture;
1615 }
1616 
1617 static AVRational update_sar(int old_w, int old_h, AVRational sar, int new_w, int new_h)
1618 {
1619  // attempt to keep aspect during typical resolution switches
1620  if (!sar.num)
1621  sar = (AVRational){1, 1};
1622 
1623  sar = av_mul_q(sar, (AVRational){new_h * old_w, new_w * old_h});
1624  return sar;
1625 }
1626 
1627 int ff_rv34_decode_frame(AVCodecContext *avctx,
1628  void *data, int *got_picture_ptr,
1629  AVPacket *avpkt)
1630 {
1631  const uint8_t *buf = avpkt->data;
1632  int buf_size = avpkt->size;
1633  RV34DecContext *r = avctx->priv_data;
1634  MpegEncContext *s = &r->s;
1635  AVFrame *pict = data;
1636  SliceInfo si;
1637  int i, ret;
1638  int slice_count;
1639  const uint8_t *slices_hdr = NULL;
1640  int last = 0;
1641 
1642  /* no supplementary picture */
1643  if (buf_size == 0) {
1644  /* special case for last picture */
1645  if (s->low_delay==0 && s->next_picture_ptr) {
1646  if ((ret = av_frame_ref(pict, s->next_picture_ptr->f)) < 0)
1647  return ret;
1648  s->next_picture_ptr = NULL;
1649 
1650  *got_picture_ptr = 1;
1651  }
1652  return 0;
1653  }
1654 
1655  if(!avctx->slice_count){
1656  slice_count = (*buf++) + 1;
1657  slices_hdr = buf + 4;
1658  buf += 8 * slice_count;
1659  buf_size -= 1 + 8 * slice_count;
1660  }else
1661  slice_count = avctx->slice_count;
1662 
1663  //parse first slice header to check whether this frame can be decoded
1664  if(get_slice_offset(avctx, slices_hdr, 0) < 0 ||
1665  get_slice_offset(avctx, slices_hdr, 0) > buf_size){
1666  av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");
1667  return AVERROR_INVALIDDATA;
1668  }
1669  init_get_bits(&s->gb, buf+get_slice_offset(avctx, slices_hdr, 0), (buf_size-get_slice_offset(avctx, slices_hdr, 0))*8);
1670  if(r->parse_slice_header(r, &r->s.gb, &si) < 0 || si.start){
1671  av_log(avctx, AV_LOG_ERROR, "First slice header is incorrect\n");
1672  return AVERROR_INVALIDDATA;
1673  }
1674  if ((!s->last_picture_ptr || !s->last_picture_ptr->f->data[0]) &&
1675  si.type == AV_PICTURE_TYPE_B) {
1676  av_log(avctx, AV_LOG_ERROR, "Invalid decoder state: B-frame without "
1677  "reference data.\n");
1678  return AVERROR_INVALIDDATA;
1679  }
1680  if( (avctx->skip_frame >= AVDISCARD_NONREF && si.type==AV_PICTURE_TYPE_B)
1681  || (avctx->skip_frame >= AVDISCARD_NONKEY && si.type!=AV_PICTURE_TYPE_I)
1682  || avctx->skip_frame >= AVDISCARD_ALL)
1683  return avpkt->size;
1684 
1685  /* first slice */
1686  if (si.start == 0) {
1687  if (s->mb_num_left > 0 && s->current_picture_ptr) {
1688  av_log(avctx, AV_LOG_ERROR, "New frame but still %d MB left.\n",
1689  s->mb_num_left);
1690  ff_er_frame_end(&s->er);
1691  ff_mpv_frame_end(s);
1692  }
1693 
1694  if (s->width != si.width || s->height != si.height) {
1695  int err;
1696 
1697  av_log(s->avctx, AV_LOG_WARNING, "Changing dimensions to %dx%d\n",
1698  si.width, si.height);
1699 
1700  if (av_image_check_size(si.width, si.height, 0, s->avctx))
1701  return AVERROR_INVALIDDATA;
1702 
1703  s->avctx->sample_aspect_ratio = update_sar(
1704  s->width, s->height, s->avctx->sample_aspect_ratio,
1705  si.width, si.height);
1706  s->width = si.width;
1707  s->height = si.height;
1708 
1709  err = ff_set_dimensions(s->avctx, s->width, s->height);
1710  if (err < 0)
1711  return err;
1712 
1713  if ((err = ff_mpv_common_frame_size_change(s)) < 0)
1714  return err;
1715  if ((err = rv34_decoder_realloc(r)) < 0)
1716  return err;
1717  }
1718  s->pict_type = si.type ? si.type : AV_PICTURE_TYPE_I;
1719  if (ff_mpv_frame_start(s, s->avctx) < 0)
1720  return -1;
1721  ff_mpeg_er_frame_start(s);
1722  if (!r->tmp_b_block_base) {
1723  int i;
1724 
1725  r->tmp_b_block_base = av_malloc(s->linesize * 48);
1726  for (i = 0; i < 2; i++)
1727  r->tmp_b_block_y[i] = r->tmp_b_block_base
1728  + i * 16 * s->linesize;
1729  for (i = 0; i < 4; i++)
1730  r->tmp_b_block_uv[i] = r->tmp_b_block_base + 32 * s->linesize
1731  + (i >> 1) * 8 * s->uvlinesize
1732  + (i & 1) * 16;
1733  }
1734  r->cur_pts = si.pts;
1735  if (s->pict_type != AV_PICTURE_TYPE_B) {
1736  r->last_pts = r->next_pts;
1737  r->next_pts = r->cur_pts;
1738  } else {
1739  int refdist = GET_PTS_DIFF(r->next_pts, r->last_pts);
1740  int dist0 = GET_PTS_DIFF(r->cur_pts, r->last_pts);
1741  int dist1 = GET_PTS_DIFF(r->next_pts, r->cur_pts);
1742 
1743  if(!refdist){
1744  r->mv_weight1 = r->mv_weight2 = r->weight1 = r->weight2 = 8192;
1745  r->scaled_weight = 0;
1746  }else{
1747  r->mv_weight1 = (dist0 << 14) / refdist;
1748  r->mv_weight2 = (dist1 << 14) / refdist;
1749  if((r->mv_weight1|r->mv_weight2) & 511){
1750  r->weight1 = r->mv_weight1;
1751  r->weight2 = r->mv_weight2;
1752  r->scaled_weight = 0;
1753  }else{
1754  r->weight1 = r->mv_weight1 >> 9;
1755  r->weight2 = r->mv_weight2 >> 9;
1756  r->scaled_weight = 1;
1757  }
1758  }
1759  }
1760  s->mb_x = s->mb_y = 0;
1761  ff_thread_finish_setup(s->avctx);
1762  } else if (HAVE_THREADS &&
1763  (s->avctx->active_thread_type & FF_THREAD_FRAME)) {
1764  av_log(s->avctx, AV_LOG_ERROR, "Decoder needs full frames in frame "
1765  "multithreading mode (start MB is %d).\n", si.start);
1766  return AVERROR_INVALIDDATA;
1767  }
1768 
1769  for(i = 0; i < slice_count; i++){
1770  int offset = get_slice_offset(avctx, slices_hdr, i);
1771  int size;
1772  if(i+1 == slice_count)
1773  size = buf_size - offset;
1774  else
1775  size = get_slice_offset(avctx, slices_hdr, i+1) - offset;
1776 
1777  if(offset < 0 || offset > buf_size){
1778  av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");
1779  break;
1780  }
1781 
1782  r->si.end = s->mb_width * s->mb_height;
1783  s->mb_num_left = r->s.mb_x + r->s.mb_y*r->s.mb_width - r->si.start;
1784 
1785  if(i+1 < slice_count){
1786  if (get_slice_offset(avctx, slices_hdr, i+1) < 0 ||
1787  get_slice_offset(avctx, slices_hdr, i+1) > buf_size) {
1788  av_log(avctx, AV_LOG_ERROR, "Slice offset is invalid\n");
1789  break;
1790  }
1791  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);
1792  if(r->parse_slice_header(r, &r->s.gb, &si) < 0){
1793  if(i+2 < slice_count)
1794  size = get_slice_offset(avctx, slices_hdr, i+2) - offset;
1795  else
1796  size = buf_size - offset;
1797  }else
1798  r->si.end = si.start;
1799  }
1800  if (size < 0 || size > buf_size - offset) {
1801  av_log(avctx, AV_LOG_ERROR, "Slice size is invalid\n");
1802  break;
1803  }
1804  last = rv34_decode_slice(r, r->si.end, buf + offset, size);
1805  if(last)
1806  break;
1807  }
1808 
1809  if (s->current_picture_ptr) {
1810  if (last) {
1811  if(r->loop_filter)
1812  r->loop_filter(r, s->mb_height - 1);
1813 
1814  ret = finish_frame(avctx, pict);
1815  if (ret < 0)
1816  return ret;
1817  *got_picture_ptr = ret;
1818  } else if (HAVE_THREADS &&
1819  (s->avctx->active_thread_type & FF_THREAD_FRAME)) {
1820  av_log(avctx, AV_LOG_INFO, "marking unfished frame as finished\n");
1821  /* always mark the current frame as finished, frame-mt supports
1822  * only complete frames */
1823  ff_er_frame_end(&s->er);
1824  ff_mpv_frame_end(s);
1825  s->mb_num_left = 0;
1826  ff_thread_report_progress(&s->current_picture_ptr->tf, INT_MAX, 0);
1827  return AVERROR_INVALIDDATA;
1828  }
1829  }
1830 
1831  return avpkt->size;
1832 }
1833 
1834 av_cold int ff_rv34_decode_end(AVCodecContext *avctx)
1835 {
1836  RV34DecContext *r = avctx->priv_data;
1837 
1838  ff_mpv_common_end(&r->s);
1839  rv34_decoder_free(r);
1840 
1841  return 0;
1842 }
Generated on Sun Sep 14 2014 18:56:03 for FFmpeg by   doxygen 1.8.2