rv30.c
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1 /*
2  * RV30 decoder
3  * Copyright (c) 2007 Konstantin Shishkov
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
27 #include "avcodec.h"
28 #include "dsputil.h"
29 #include "mpegvideo.h"
30 #include "golomb.h"
31 
32 #include "rv34.h"
33 #include "rv30data.h"
34 
35 
37 {
38  int mb_bits;
39  int w = r->s.width, h = r->s.height;
40  int mb_size;
41  int rpr;
42 
43  memset(si, 0, sizeof(SliceInfo));
44  if(get_bits(gb, 3))
45  return -1;
46  si->type = get_bits(gb, 2);
47  if(si->type == 1) si->type = 0;
48  if(get_bits1(gb))
49  return -1;
50  si->quant = get_bits(gb, 5);
51  skip_bits1(gb);
52  si->pts = get_bits(gb, 13);
53  rpr = get_bits(gb, r->rpr);
54  if(rpr){
55  w = r->s.avctx->extradata[6 + rpr*2] << 2;
56  h = r->s.avctx->extradata[7 + rpr*2] << 2;
57  }
58  si->width = w;
59  si->height = h;
60  mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
61  mb_bits = ff_rv34_get_start_offset(gb, mb_size);
62  si->start = get_bits(gb, mb_bits);
63  skip_bits1(gb);
64  return 0;
65 }
66 
70 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
71 {
72  int i, j, k;
73 
74  for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
75  for(j = 0; j < 4; j+= 2){
76  int code = svq3_get_ue_golomb(gb) << 1;
77  if(code >= 81*2){
78  av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
79  return -1;
80  }
81  for(k = 0; k < 2; k++){
82  int A = dst[-r->intra_types_stride] + 1;
83  int B = dst[-1] + 1;
84  *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
85  if(dst[-1] == 9){
86  av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
87  return -1;
88  }
89  }
90  }
91  }
92  return 0;
93 }
94 
99 {
100  static const int rv30_p_types[6] = { RV34_MB_SKIP, RV34_MB_P_16x16, RV34_MB_P_8x8, -1, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };
102  MpegEncContext *s = &r->s;
103  GetBitContext *gb = &s->gb;
104  int code = svq3_get_ue_golomb(gb);
105 
106  if(code > 11){
107  av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
108  return -1;
109  }
110  if(code > 5){
111  av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
112  code -= 6;
113  }
114  if(s->pict_type != AV_PICTURE_TYPE_B)
115  return rv30_p_types[code];
116  else
117  return rv30_b_types[code];
118 }
119 
120 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
121  const int stride, const int lim)
122 {
123  uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
124  int i, diff;
125 
126  for(i = 0; i < 4; i++){
127  diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
128  diff = av_clip(diff, -lim, lim);
129  src[-1*step] = cm[src[-1*step] + diff];
130  src[ 0*step] = cm[src[ 0*step] - diff];
131  src += stride;
132  }
133 }
134 
135 static void rv30_loop_filter(RV34DecContext *r, int row)
136 {
137  MpegEncContext *s = &r->s;
138  int mb_pos, mb_x;
139  int i, j, k;
140  uint8_t *Y, *C;
141  int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
142 
143  mb_pos = row * s->mb_stride;
144  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
145  int mbtype = s->current_picture_ptr->f.mb_type[mb_pos];
146  if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
147  r->deblock_coefs[mb_pos] = 0xFFFF;
148  if(IS_INTRA(mbtype))
149  r->cbp_chroma[mb_pos] = 0xFF;
150  }
151 
152  /* all vertical edges are filtered first
153  * and horizontal edges are filtered on the next iteration
154  */
155  mb_pos = row * s->mb_stride;
156  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
157  cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos]];
158  if(mb_x)
159  left_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos - 1]];
160  for(j = 0; j < 16; j += 4){
161  Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
162  for(i = !mb_x; i < 4; i++, Y += 4){
163  int ij = i + j;
164  loc_lim = 0;
165  if(r->deblock_coefs[mb_pos] & (1 << ij))
166  loc_lim = cur_lim;
167  else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
168  loc_lim = left_lim;
169  else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
170  loc_lim = cur_lim;
171  if(loc_lim)
172  rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
173  }
174  }
175  for(k = 0; k < 2; k++){
176  int cur_cbp, left_cbp = 0;
177  cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
178  if(mb_x)
179  left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
180  for(j = 0; j < 8; j += 4){
181  C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
182  for(i = !mb_x; i < 2; i++, C += 4){
183  int ij = i + (j >> 1);
184  loc_lim = 0;
185  if(cur_cbp && (1 << ij))
186  loc_lim = cur_lim;
187  else if(!i && left_cbp & (1 << (ij + 1)))
188  loc_lim = left_lim;
189  else if( i && cur_cbp & (1 << (ij - 1)))
190  loc_lim = cur_lim;
191  if(loc_lim)
192  rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
193  }
194  }
195  }
196  }
197  mb_pos = row * s->mb_stride;
198  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
199  cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos]];
200  if(row)
201  top_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos - s->mb_stride]];
202  for(j = 4*!row; j < 16; j += 4){
203  Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;
204  for(i = 0; i < 4; i++, Y += 4){
205  int ij = i + j;
206  loc_lim = 0;
207  if(r->deblock_coefs[mb_pos] & (1 << ij))
208  loc_lim = cur_lim;
209  else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
210  loc_lim = top_lim;
211  else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
212  loc_lim = cur_lim;
213  if(loc_lim)
214  rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
215  }
216  }
217  for(k = 0; k < 2; k++){
218  int cur_cbp, top_cbp = 0;
219  cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
220  if(row)
221  top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
222  for(j = 4*!row; j < 8; j += 4){
223  C = s->current_picture_ptr->f.data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
224  for(i = 0; i < 2; i++, C += 4){
225  int ij = i + (j >> 1);
226  loc_lim = 0;
227  if(r->cbp_chroma[mb_pos] && (1 << ij))
228  loc_lim = cur_lim;
229  else if(!j && top_cbp & (1 << (ij + 2)))
230  loc_lim = top_lim;
231  else if( j && cur_cbp & (1 << (ij - 2)))
232  loc_lim = cur_lim;
233  if(loc_lim)
234  rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
235  }
236  }
237  }
238  }
239 }
240 
245 {
246  RV34DecContext *r = avctx->priv_data;
247  int ret;
248 
249  r->rv30 = 1;
250  if ((ret = ff_rv34_decode_init(avctx)) < 0)
251  return ret;
252  if(avctx->extradata_size < 2){
253  av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
254  return -1;
255  }
256  r->rpr = (avctx->extradata[1] & 7) >> 1;
257  r->rpr = FFMIN(r->rpr + 1, 3);
258  if(avctx->extradata_size - 8 < (r->rpr - 1) * 2){
259  av_log(avctx, AV_LOG_ERROR, "Insufficient extradata - need at least %d bytes, got %d\n",
260  6 + r->rpr * 2, avctx->extradata_size);
261  return AVERROR(EINVAL);
262  }
269  return 0;
270 }
271 
273  .name = "rv30",
274  .type = AVMEDIA_TYPE_VIDEO,
275  .id = CODEC_ID_RV30,
276  .priv_data_size = sizeof(RV34DecContext),
281  .flush = ff_mpeg_flush,
282  .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
283  .pix_fmts = ff_pixfmt_list_420,
286 };