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rv30.c
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1 /*
2  * RV30 decoder
3  * Copyright (c) 2007 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 decoder
25  */
26 
27 #include "avcodec.h"
28 #include "mpegvideo.h"
29 #include "golomb.h"
30 
31 #include "rv34.h"
32 #include "rv30data.h"
33 
34 
36 {
37  AVCodecContext *avctx = r->s.avctx;
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, av_log2(r->max_rpr) + 1);
54  if(rpr){
55  if (rpr > r->max_rpr) {
56  av_log(avctx, AV_LOG_ERROR, "rpr too large\n");
57  return AVERROR_INVALIDDATA;
58  }
59 
60  if (avctx->extradata_size < rpr * 2 + 8) {
61  av_log(avctx, AV_LOG_ERROR,
62  "Insufficient extradata - need at least %d bytes, got %d\n",
63  8 + rpr * 2, avctx->extradata_size);
64  return AVERROR(EINVAL);
65  }
66 
67  w = r->s.avctx->extradata[6 + rpr*2] << 2;
68  h = r->s.avctx->extradata[7 + rpr*2] << 2;
69  }
70  si->width = w;
71  si->height = h;
72  mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
73  mb_bits = ff_rv34_get_start_offset(gb, mb_size);
74  si->start = get_bits(gb, mb_bits);
75  skip_bits1(gb);
76  return 0;
77 }
78 
79 /**
80  * Decode 4x4 intra types array.
81  */
82 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
83 {
84  int i, j, k;
85 
86  for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
87  for(j = 0; j < 4; j+= 2){
88  unsigned code = svq3_get_ue_golomb(gb) << 1;
89  if (code > 80U*2U) {
90  av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
91  return -1;
92  }
93  for(k = 0; k < 2; k++){
94  int A = dst[-r->intra_types_stride] + 1;
95  int B = dst[-1] + 1;
96  *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
97  if(dst[-1] == 9){
98  av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
99  return -1;
100  }
101  }
102  }
103  }
104  return 0;
105 }
106 
107 /**
108  * Decode macroblock information.
109  */
111 {
112  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 };
114  MpegEncContext *s = &r->s;
115  GetBitContext *gb = &s->gb;
116  unsigned code = svq3_get_ue_golomb(gb);
117 
118  if (code > 11) {
119  av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
120  return -1;
121  }
122  if(code > 5){
123  av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
124  code -= 6;
125  }
126  if(s->pict_type != AV_PICTURE_TYPE_B)
127  return rv30_p_types[code];
128  else
129  return rv30_b_types[code];
130 }
131 
132 static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
133  const int stride, const int lim)
134 {
135  const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
136  int i, diff;
137 
138  for(i = 0; i < 4; i++){
139  diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
140  diff = av_clip(diff, -lim, lim);
141  src[-1*step] = cm[src[-1*step] + diff];
142  src[ 0*step] = cm[src[ 0*step] - diff];
143  src += stride;
144  }
145 }
146 
147 static void rv30_loop_filter(RV34DecContext *r, int row)
148 {
149  MpegEncContext *s = &r->s;
150  int mb_pos, mb_x;
151  int i, j, k;
152  uint8_t *Y, *C;
153  int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
154 
155  mb_pos = row * s->mb_stride;
156  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
157  int mbtype = s->current_picture_ptr->mb_type[mb_pos];
158  if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
159  r->deblock_coefs[mb_pos] = 0xFFFF;
160  if(IS_INTRA(mbtype))
161  r->cbp_chroma[mb_pos] = 0xFF;
162  }
163 
164  /* all vertical edges are filtered first
165  * and horizontal edges are filtered on the next iteration
166  */
167  mb_pos = row * s->mb_stride;
168  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
169  cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
170  if(mb_x)
171  left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
172  for(j = 0; j < 16; j += 4){
173  Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
174  for(i = !mb_x; i < 4; i++, Y += 4){
175  int ij = i + j;
176  loc_lim = 0;
177  if(r->deblock_coefs[mb_pos] & (1 << ij))
178  loc_lim = cur_lim;
179  else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
180  loc_lim = left_lim;
181  else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
182  loc_lim = cur_lim;
183  if(loc_lim)
184  rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
185  }
186  }
187  for(k = 0; k < 2; k++){
188  int cur_cbp, left_cbp = 0;
189  cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
190  if(mb_x)
191  left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
192  for(j = 0; j < 8; j += 4){
193  C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
194  for(i = !mb_x; i < 2; i++, C += 4){
195  int ij = i + (j >> 1);
196  loc_lim = 0;
197  if (cur_cbp & (1 << ij))
198  loc_lim = cur_lim;
199  else if(!i && left_cbp & (1 << (ij + 1)))
200  loc_lim = left_lim;
201  else if( i && cur_cbp & (1 << (ij - 1)))
202  loc_lim = cur_lim;
203  if(loc_lim)
204  rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
205  }
206  }
207  }
208  }
209  mb_pos = row * s->mb_stride;
210  for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
211  cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
212  if(row)
213  top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
214  for(j = 4*!row; j < 16; j += 4){
215  Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;
216  for(i = 0; i < 4; i++, Y += 4){
217  int ij = i + j;
218  loc_lim = 0;
219  if(r->deblock_coefs[mb_pos] & (1 << ij))
220  loc_lim = cur_lim;
221  else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
222  loc_lim = top_lim;
223  else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
224  loc_lim = cur_lim;
225  if(loc_lim)
226  rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
227  }
228  }
229  for(k = 0; k < 2; k++){
230  int cur_cbp, top_cbp = 0;
231  cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
232  if(row)
233  top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
234  for(j = 4*!row; j < 8; j += 4){
235  C = s->current_picture_ptr->f.data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
236  for(i = 0; i < 2; i++, C += 4){
237  int ij = i + (j >> 1);
238  loc_lim = 0;
239  if (r->cbp_chroma[mb_pos] & (1 << ij))
240  loc_lim = cur_lim;
241  else if(!j && top_cbp & (1 << (ij + 2)))
242  loc_lim = top_lim;
243  else if( j && cur_cbp & (1 << (ij - 2)))
244  loc_lim = cur_lim;
245  if(loc_lim)
246  rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
247  }
248  }
249  }
250  }
251 }
252 
253 /**
254  * Initialize decoder.
255  */
257 {
258  RV34DecContext *r = avctx->priv_data;
259  int ret;
260 
261  r->rv30 = 1;
262  if ((ret = ff_rv34_decode_init(avctx)) < 0)
263  return ret;
264  if(avctx->extradata_size < 2){
265  av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
266  return -1;
267  }
268 
269  r->max_rpr = avctx->extradata[1] & 7;
270  if(avctx->extradata_size < 2*r->max_rpr + 8){
271  av_log(avctx, AV_LOG_WARNING, "Insufficient extradata - need at least %d bytes, got %d\n",
272  2*r->max_rpr + 8, avctx->extradata_size);
273  }
274 
281  return 0;
282 }
283 
285  .name = "rv30",
286  .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
287  .type = AVMEDIA_TYPE_VIDEO,
288  .id = AV_CODEC_ID_RV30,
289  .priv_data_size = sizeof(RV34DecContext),
293  .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY |
295  .flush = ff_mpeg_flush,
296  .pix_fmts = ff_pixfmt_list_420,
299 };