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  AVCodecContext *avctx = r->s.avctx;
39  int mb_bits;
40  int w = r->s.width, h = r->s.height;
41  int mb_size;
42  int rpr;
43 
44  memset(si, 0, sizeof(SliceInfo));
45  if(get_bits(gb, 3))
46  return -1;
47  si->type = get_bits(gb, 2);
48  if(si->type == 1) si->type = 0;
49  if(get_bits1(gb))
50  return -1;
51  si->quant = get_bits(gb, 5);
52  skip_bits1(gb);
53  si->pts = get_bits(gb, 13);
54  rpr = get_bits(gb, r->rpr);
55  if(rpr){
56  if (avctx->extradata_size < rpr * 2 + 8) {
57  av_log(avctx, AV_LOG_ERROR,
58  "Insufficient extradata - need at least %d bytes, got %d\n",
59  8 + rpr * 2, avctx->extradata_size);
60  return AVERROR(EINVAL);
61  }
62 
63  w = r->s.avctx->extradata[6 + rpr*2] << 2;
64  h = r->s.avctx->extradata[7 + rpr*2] << 2;
65  }
66  si->width = w;
67  si->height = h;
68  mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
69  mb_bits = ff_rv34_get_start_offset(gb, mb_size);
70  si->start = get_bits(gb, mb_bits);
71  skip_bits1(gb);
72  return 0;
73 }
74 
78 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
79 {
80  int i, j, k;
81 
82  for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
83  for(j = 0; j < 4; j+= 2){
84  unsigned code = svq3_get_ue_golomb(gb) << 1;
85  if(code >= 81*2){
86  av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
87  return -1;
88  }
89  for(k = 0; k < 2; k++){
90  int A = dst[-r->intra_types_stride] + 1;
91  int B = dst[-1] + 1;
92  *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
93  if(dst[-1] == 9){
94  av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
95  return -1;
96  }
97  }
98  }
99  }
100  return 0;
101 }
102 
107 {
108  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 };
110  MpegEncContext *s = &r->s;
111  GetBitContext *gb = &s->gb;
112  unsigned code = svq3_get_ue_golomb(gb);
113 
114  if (code > 11) {
115  av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
116  return -1;
117  }
118  if(code > 5){
119  av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
120  code -= 6;
121  }
122  if(s->pict_type != AV_PICTURE_TYPE_B)
123  return rv30_p_types[code];
124  else
125  return rv30_b_types[code];
126 }
127 
128 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
129  const int stride, const int lim)
130 {
132  int i, diff;
133 
134  for(i = 0; i < 4; i++){
135  diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
136  diff = av_clip(diff, -lim, lim);
137  src[-1*step] = cm[src[-1*step] + diff];
138  src[ 0*step] = cm[src[ 0*step] - diff];
139  src += stride;
140  }
141 }
142 
143 static void rv30_loop_filter(RV34DecContext *r, int row)
144 {
145  MpegEncContext *s = &r->s;
146  int mb_pos, mb_x;
147  int i, j, k;
148  uint8_t *Y, *C;
149  int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
150 
151  mb_pos = row * s->mb_stride;
152  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
153  int mbtype = s->current_picture_ptr->f.mb_type[mb_pos];
154  if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
155  r->deblock_coefs[mb_pos] = 0xFFFF;
156  if(IS_INTRA(mbtype))
157  r->cbp_chroma[mb_pos] = 0xFF;
158  }
159 
160  /* all vertical edges are filtered first
161  * and horizontal edges are filtered on the next iteration
162  */
163  mb_pos = row * s->mb_stride;
164  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
165  cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos]];
166  if(mb_x)
167  left_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos - 1]];
168  for(j = 0; j < 16; j += 4){
169  Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
170  for(i = !mb_x; i < 4; i++, Y += 4){
171  int ij = i + j;
172  loc_lim = 0;
173  if(r->deblock_coefs[mb_pos] & (1 << ij))
174  loc_lim = cur_lim;
175  else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
176  loc_lim = left_lim;
177  else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
178  loc_lim = cur_lim;
179  if(loc_lim)
180  rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
181  }
182  }
183  for(k = 0; k < 2; k++){
184  int cur_cbp, left_cbp = 0;
185  cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
186  if(mb_x)
187  left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
188  for(j = 0; j < 8; j += 4){
189  C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
190  for(i = !mb_x; i < 2; i++, C += 4){
191  int ij = i + (j >> 1);
192  loc_lim = 0;
193  if (cur_cbp & (1 << ij))
194  loc_lim = cur_lim;
195  else if(!i && left_cbp & (1 << (ij + 1)))
196  loc_lim = left_lim;
197  else if( i && cur_cbp & (1 << (ij - 1)))
198  loc_lim = cur_lim;
199  if(loc_lim)
200  rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
201  }
202  }
203  }
204  }
205  mb_pos = row * s->mb_stride;
206  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
207  cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos]];
208  if(row)
209  top_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos - s->mb_stride]];
210  for(j = 4*!row; j < 16; j += 4){
211  Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;
212  for(i = 0; i < 4; i++, Y += 4){
213  int ij = i + j;
214  loc_lim = 0;
215  if(r->deblock_coefs[mb_pos] & (1 << ij))
216  loc_lim = cur_lim;
217  else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
218  loc_lim = top_lim;
219  else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
220  loc_lim = cur_lim;
221  if(loc_lim)
222  rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
223  }
224  }
225  for(k = 0; k < 2; k++){
226  int cur_cbp, top_cbp = 0;
227  cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
228  if(row)
229  top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
230  for(j = 4*!row; j < 8; j += 4){
231  C = s->current_picture_ptr->f.data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
232  for(i = 0; i < 2; i++, C += 4){
233  int ij = i + (j >> 1);
234  loc_lim = 0;
235  if (r->cbp_chroma[mb_pos] & (1 << ij))
236  loc_lim = cur_lim;
237  else if(!j && top_cbp & (1 << (ij + 2)))
238  loc_lim = top_lim;
239  else if( j && cur_cbp & (1 << (ij - 2)))
240  loc_lim = cur_lim;
241  if(loc_lim)
242  rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
243  }
244  }
245  }
246  }
247 }
248 
253 {
254  RV34DecContext *r = avctx->priv_data;
255  int ret;
256 
257  r->rv30 = 1;
258  if ((ret = ff_rv34_decode_init(avctx)) < 0)
259  return ret;
260  if(avctx->extradata_size < 2){
261  av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
262  return -1;
263  }
264  r->rpr = (avctx->extradata[1] & 7) >> 1;
265  r->rpr = FFMIN(r->rpr + 1, 3);
266 
273  return 0;
274 }
275 
277  .name = "rv30",
278  .type = AVMEDIA_TYPE_VIDEO,
279  .id = AV_CODEC_ID_RV30,
280  .priv_data_size = sizeof(RV34DecContext),
284  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY |
286  .flush = ff_mpeg_flush,
287  .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
288  .pix_fmts = ff_pixfmt_list_420,
291 };