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2ba45a60 DM |
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 "mpegutils.h" | |
29 | #include "mpegvideo.h" | |
30 | #include "golomb.h" | |
31 | ||
32 | #include "rv34.h" | |
33 | #include "rv30data.h" | |
34 | ||
35 | ||
36 | static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si) | |
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, av_log2(r->max_rpr) + 1); | |
55 | if(rpr){ | |
56 | if (rpr > r->max_rpr) { | |
57 | av_log(avctx, AV_LOG_ERROR, "rpr too large\n"); | |
58 | return AVERROR_INVALIDDATA; | |
59 | } | |
60 | ||
61 | if (avctx->extradata_size < rpr * 2 + 8) { | |
62 | av_log(avctx, AV_LOG_ERROR, | |
63 | "Insufficient extradata - need at least %d bytes, got %d\n", | |
64 | 8 + rpr * 2, avctx->extradata_size); | |
65 | return AVERROR(EINVAL); | |
66 | } | |
67 | ||
68 | w = r->s.avctx->extradata[6 + rpr*2] << 2; | |
69 | h = r->s.avctx->extradata[7 + rpr*2] << 2; | |
70 | } | |
71 | si->width = w; | |
72 | si->height = h; | |
73 | mb_size = ((w + 15) >> 4) * ((h + 15) >> 4); | |
74 | mb_bits = ff_rv34_get_start_offset(gb, mb_size); | |
75 | si->start = get_bits(gb, mb_bits); | |
76 | skip_bits1(gb); | |
77 | return 0; | |
78 | } | |
79 | ||
80 | /** | |
81 | * Decode 4x4 intra types array. | |
82 | */ | |
83 | static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst) | |
84 | { | |
85 | int i, j, k; | |
86 | ||
87 | for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){ | |
88 | for(j = 0; j < 4; j+= 2){ | |
89 | unsigned code = svq3_get_ue_golomb(gb) << 1; | |
90 | if (code > 80U*2U) { | |
91 | av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n"); | |
92 | return -1; | |
93 | } | |
94 | for(k = 0; k < 2; k++){ | |
95 | int A = dst[-r->intra_types_stride] + 1; | |
96 | int B = dst[-1] + 1; | |
97 | *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]]; | |
98 | if(dst[-1] == 9){ | |
99 | av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n"); | |
100 | return -1; | |
101 | } | |
102 | } | |
103 | } | |
104 | } | |
105 | return 0; | |
106 | } | |
107 | ||
108 | /** | |
109 | * Decode macroblock information. | |
110 | */ | |
111 | static int rv30_decode_mb_info(RV34DecContext *r) | |
112 | { | |
113 | 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 | static const int rv30_b_types[6] = { RV34_MB_SKIP, RV34_MB_B_DIRECT, RV34_MB_B_FORWARD, RV34_MB_B_BACKWARD, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 }; | |
115 | MpegEncContext *s = &r->s; | |
116 | GetBitContext *gb = &s->gb; | |
117 | unsigned code = svq3_get_ue_golomb(gb); | |
118 | ||
119 | if (code > 11) { | |
120 | av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n"); | |
121 | return -1; | |
122 | } | |
123 | if(code > 5){ | |
124 | av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n"); | |
125 | code -= 6; | |
126 | } | |
127 | if(s->pict_type != AV_PICTURE_TYPE_B) | |
128 | return rv30_p_types[code]; | |
129 | else | |
130 | return rv30_b_types[code]; | |
131 | } | |
132 | ||
133 | static inline void rv30_weak_loop_filter(uint8_t *src, const int step, | |
134 | const int stride, const int lim) | |
135 | { | |
136 | const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP; | |
137 | int i, diff; | |
138 | ||
139 | for(i = 0; i < 4; i++){ | |
140 | diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3; | |
141 | diff = av_clip(diff, -lim, lim); | |
142 | src[-1*step] = cm[src[-1*step] + diff]; | |
143 | src[ 0*step] = cm[src[ 0*step] - diff]; | |
144 | src += stride; | |
145 | } | |
146 | } | |
147 | ||
148 | static void rv30_loop_filter(RV34DecContext *r, int row) | |
149 | { | |
150 | MpegEncContext *s = &r->s; | |
151 | int mb_pos, mb_x; | |
152 | int i, j, k; | |
153 | uint8_t *Y, *C; | |
154 | int loc_lim, cur_lim, left_lim = 0, top_lim = 0; | |
155 | ||
156 | mb_pos = row * s->mb_stride; | |
157 | for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ | |
158 | int mbtype = s->current_picture_ptr->mb_type[mb_pos]; | |
159 | if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype)) | |
160 | r->deblock_coefs[mb_pos] = 0xFFFF; | |
161 | if(IS_INTRA(mbtype)) | |
162 | r->cbp_chroma[mb_pos] = 0xFF; | |
163 | } | |
164 | ||
165 | /* all vertical edges are filtered first | |
166 | * and horizontal edges are filtered on the next iteration | |
167 | */ | |
168 | mb_pos = row * s->mb_stride; | |
169 | for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ | |
170 | cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]]; | |
171 | if(mb_x) | |
172 | left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]]; | |
173 | for(j = 0; j < 16; j += 4){ | |
174 | Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x; | |
175 | for(i = !mb_x; i < 4; i++, Y += 4){ | |
176 | int ij = i + j; | |
177 | loc_lim = 0; | |
178 | if(r->deblock_coefs[mb_pos] & (1 << ij)) | |
179 | loc_lim = cur_lim; | |
180 | else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3))) | |
181 | loc_lim = left_lim; | |
182 | else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1))) | |
183 | loc_lim = cur_lim; | |
184 | if(loc_lim) | |
185 | rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim); | |
186 | } | |
187 | } | |
188 | for(k = 0; k < 2; k++){ | |
189 | int cur_cbp, left_cbp = 0; | |
190 | cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF; | |
191 | if(mb_x) | |
192 | left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF; | |
193 | for(j = 0; j < 8; j += 4){ | |
194 | C = s->current_picture_ptr->f->data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x; | |
195 | for(i = !mb_x; i < 2; i++, C += 4){ | |
196 | int ij = i + (j >> 1); | |
197 | loc_lim = 0; | |
198 | if (cur_cbp & (1 << ij)) | |
199 | loc_lim = cur_lim; | |
200 | else if(!i && left_cbp & (1 << (ij + 1))) | |
201 | loc_lim = left_lim; | |
202 | else if( i && cur_cbp & (1 << (ij - 1))) | |
203 | loc_lim = cur_lim; | |
204 | if(loc_lim) | |
205 | rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim); | |
206 | } | |
207 | } | |
208 | } | |
209 | } | |
210 | mb_pos = row * s->mb_stride; | |
211 | for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){ | |
212 | cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]]; | |
213 | if(row) | |
214 | top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]]; | |
215 | for(j = 4*!row; j < 16; j += 4){ | |
216 | Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize; | |
217 | for(i = 0; i < 4; i++, Y += 4){ | |
218 | int ij = i + j; | |
219 | loc_lim = 0; | |
220 | if(r->deblock_coefs[mb_pos] & (1 << ij)) | |
221 | loc_lim = cur_lim; | |
222 | else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12))) | |
223 | loc_lim = top_lim; | |
224 | else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4))) | |
225 | loc_lim = cur_lim; | |
226 | if(loc_lim) | |
227 | rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim); | |
228 | } | |
229 | } | |
230 | for(k = 0; k < 2; k++){ | |
231 | int cur_cbp, top_cbp = 0; | |
232 | cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF; | |
233 | if(row) | |
234 | top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF; | |
235 | for(j = 4*!row; j < 8; j += 4){ | |
236 | C = s->current_picture_ptr->f->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize; | |
237 | for(i = 0; i < 2; i++, C += 4){ | |
238 | int ij = i + (j >> 1); | |
239 | loc_lim = 0; | |
240 | if (r->cbp_chroma[mb_pos] & (1 << ij)) | |
241 | loc_lim = cur_lim; | |
242 | else if(!j && top_cbp & (1 << (ij + 2))) | |
243 | loc_lim = top_lim; | |
244 | else if( j && cur_cbp & (1 << (ij - 2))) | |
245 | loc_lim = cur_lim; | |
246 | if(loc_lim) | |
247 | rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim); | |
248 | } | |
249 | } | |
250 | } | |
251 | } | |
252 | } | |
253 | ||
254 | /** | |
255 | * Initialize decoder. | |
256 | */ | |
257 | static av_cold int rv30_decode_init(AVCodecContext *avctx) | |
258 | { | |
259 | RV34DecContext *r = avctx->priv_data; | |
260 | int ret; | |
261 | ||
f6fa7814 DM |
262 | if (avctx->extradata_size < 2) { |
263 | av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n"); | |
264 | return AVERROR(EINVAL); | |
265 | } | |
2ba45a60 DM |
266 | r->rv30 = 1; |
267 | if ((ret = ff_rv34_decode_init(avctx)) < 0) | |
268 | return ret; | |
2ba45a60 DM |
269 | |
270 | r->max_rpr = avctx->extradata[1] & 7; | |
271 | if(avctx->extradata_size < 2*r->max_rpr + 8){ | |
272 | av_log(avctx, AV_LOG_WARNING, "Insufficient extradata - need at least %d bytes, got %d\n", | |
273 | 2*r->max_rpr + 8, avctx->extradata_size); | |
274 | } | |
275 | ||
276 | r->parse_slice_header = rv30_parse_slice_header; | |
277 | r->decode_intra_types = rv30_decode_intra_types; | |
278 | r->decode_mb_info = rv30_decode_mb_info; | |
279 | r->loop_filter = rv30_loop_filter; | |
280 | r->luma_dc_quant_i = rv30_luma_dc_quant; | |
281 | r->luma_dc_quant_p = rv30_luma_dc_quant; | |
282 | return 0; | |
283 | } | |
284 | ||
285 | AVCodec ff_rv30_decoder = { | |
286 | .name = "rv30", | |
287 | .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"), | |
288 | .type = AVMEDIA_TYPE_VIDEO, | |
289 | .id = AV_CODEC_ID_RV30, | |
290 | .priv_data_size = sizeof(RV34DecContext), | |
291 | .init = rv30_decode_init, | |
292 | .close = ff_rv34_decode_end, | |
293 | .decode = ff_rv34_decode_frame, | |
294 | .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY | | |
295 | CODEC_CAP_FRAME_THREADS, | |
296 | .flush = ff_mpeg_flush, | |
297 | .pix_fmts = (const enum AVPixelFormat[]) { | |
298 | AV_PIX_FMT_YUV420P, | |
299 | AV_PIX_FMT_NONE | |
300 | }, | |
301 | .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy), | |
302 | .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context), | |
303 | }; |