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path: root/libavcodec/rv30.c (plain)
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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 "mpegutils.h"
29#include "mpegvideo.h"
30#include "golomb.h"
31
32#include "rv34.h"
33#include "rv30data.h"
34
35
36static 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 } else {
71 w = r->orig_width;
72 h = r->orig_height;
73 }
74 si->width = w;
75 si->height = h;
76 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
77 mb_bits = ff_rv34_get_start_offset(gb, mb_size);
78 si->start = get_bits(gb, mb_bits);
79 skip_bits1(gb);
80 return 0;
81}
82
83/**
84 * Decode 4x4 intra types array.
85 */
86static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
87{
88 int i, j, k;
89
90 for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
91 for(j = 0; j < 4; j+= 2){
92 unsigned code = get_interleaved_ue_golomb(gb) << 1;
93 if (code > 80U*2U) {
94 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
95 return -1;
96 }
97 for(k = 0; k < 2; k++){
98 int A = dst[-r->intra_types_stride] + 1;
99 int B = dst[-1] + 1;
100 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
101 if(dst[-1] == 9){
102 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
103 return -1;
104 }
105 }
106 }
107 }
108 return 0;
109}
110
111/**
112 * Decode macroblock information.
113 */
114static int rv30_decode_mb_info(RV34DecContext *r)
115{
116 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 };
117 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 };
118 MpegEncContext *s = &r->s;
119 GetBitContext *gb = &s->gb;
120 unsigned code = get_interleaved_ue_golomb(gb);
121
122 if (code > 11) {
123 av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
124 return -1;
125 }
126 if(code > 5){
127 av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
128 code -= 6;
129 }
130 if(s->pict_type != AV_PICTURE_TYPE_B)
131 return rv30_p_types[code];
132 else
133 return rv30_b_types[code];
134}
135
136static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
137 const int stride, const int lim)
138{
139 const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
140 int i, diff;
141
142 for(i = 0; i < 4; i++){
143 diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
144 diff = av_clip(diff, -lim, lim);
145 src[-1*step] = cm[src[-1*step] + diff];
146 src[ 0*step] = cm[src[ 0*step] - diff];
147 src += stride;
148 }
149}
150
151static void rv30_loop_filter(RV34DecContext *r, int row)
152{
153 MpegEncContext *s = &r->s;
154 int mb_pos, mb_x;
155 int i, j, k;
156 uint8_t *Y, *C;
157 int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
158
159 mb_pos = row * s->mb_stride;
160 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
161 int mbtype = s->current_picture_ptr->mb_type[mb_pos];
162 if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
163 r->deblock_coefs[mb_pos] = 0xFFFF;
164 if(IS_INTRA(mbtype))
165 r->cbp_chroma[mb_pos] = 0xFF;
166 }
167
168 /* all vertical edges are filtered first
169 * and horizontal edges are filtered on the next iteration
170 */
171 mb_pos = row * s->mb_stride;
172 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
173 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
174 if(mb_x)
175 left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
176 for(j = 0; j < 16; j += 4){
177 Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
178 for(i = !mb_x; i < 4; i++, Y += 4){
179 int ij = i + j;
180 loc_lim = 0;
181 if(r->deblock_coefs[mb_pos] & (1 << ij))
182 loc_lim = cur_lim;
183 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
184 loc_lim = left_lim;
185 else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
186 loc_lim = cur_lim;
187 if(loc_lim)
188 rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
189 }
190 }
191 for(k = 0; k < 2; k++){
192 int cur_cbp, left_cbp = 0;
193 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
194 if(mb_x)
195 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
196 for(j = 0; j < 8; j += 4){
197 C = s->current_picture_ptr->f->data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
198 for(i = !mb_x; i < 2; i++, C += 4){
199 int ij = i + (j >> 1);
200 loc_lim = 0;
201 if (cur_cbp & (1 << ij))
202 loc_lim = cur_lim;
203 else if(!i && left_cbp & (1 << (ij + 1)))
204 loc_lim = left_lim;
205 else if( i && cur_cbp & (1 << (ij - 1)))
206 loc_lim = cur_lim;
207 if(loc_lim)
208 rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
209 }
210 }
211 }
212 }
213 mb_pos = row * s->mb_stride;
214 for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
215 cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
216 if(row)
217 top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
218 for(j = 4*!row; j < 16; j += 4){
219 Y = s->current_picture_ptr->f->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
220 for(i = 0; i < 4; i++, Y += 4){
221 int ij = i + j;
222 loc_lim = 0;
223 if(r->deblock_coefs[mb_pos] & (1 << ij))
224 loc_lim = cur_lim;
225 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
226 loc_lim = top_lim;
227 else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
228 loc_lim = cur_lim;
229 if(loc_lim)
230 rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
231 }
232 }
233 for(k = 0; k < 2; k++){
234 int cur_cbp, top_cbp = 0;
235 cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
236 if(row)
237 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
238 for(j = 4*!row; j < 8; j += 4){
239 C = s->current_picture_ptr->f->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
240 for(i = 0; i < 2; i++, C += 4){
241 int ij = i + (j >> 1);
242 loc_lim = 0;
243 if (r->cbp_chroma[mb_pos] & (1 << ij))
244 loc_lim = cur_lim;
245 else if(!j && top_cbp & (1 << (ij + 2)))
246 loc_lim = top_lim;
247 else if( j && cur_cbp & (1 << (ij - 2)))
248 loc_lim = cur_lim;
249 if(loc_lim)
250 rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
251 }
252 }
253 }
254 }
255}
256
257/**
258 * Initialize decoder.
259 */
260static av_cold int rv30_decode_init(AVCodecContext *avctx)
261{
262 RV34DecContext *r = avctx->priv_data;
263 int ret;
264
265 r->orig_width = avctx->coded_width;
266 r->orig_height = avctx->coded_height;
267
268 if (avctx->extradata_size < 2) {
269 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
270 return AVERROR(EINVAL);
271 }
272 r->rv30 = 1;
273 if ((ret = ff_rv34_decode_init(avctx)) < 0)
274 return ret;
275
276 r->max_rpr = avctx->extradata[1] & 7;
277 if(avctx->extradata_size < 2*r->max_rpr + 8){
278 av_log(avctx, AV_LOG_WARNING, "Insufficient extradata - need at least %d bytes, got %d\n",
279 2*r->max_rpr + 8, avctx->extradata_size);
280 }
281
282 r->parse_slice_header = rv30_parse_slice_header;
283 r->decode_intra_types = rv30_decode_intra_types;
284 r->decode_mb_info = rv30_decode_mb_info;
285 r->loop_filter = rv30_loop_filter;
286 r->luma_dc_quant_i = rv30_luma_dc_quant;
287 r->luma_dc_quant_p = rv30_luma_dc_quant;
288 return 0;
289}
290
291AVCodec ff_rv30_decoder = {
292 .name = "rv30",
293 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
294 .type = AVMEDIA_TYPE_VIDEO,
295 .id = AV_CODEC_ID_RV30,
296 .priv_data_size = sizeof(RV34DecContext),
297 .init = rv30_decode_init,
298 .close = ff_rv34_decode_end,
299 .decode = ff_rv34_decode_frame,
300 .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY |
301 AV_CODEC_CAP_FRAME_THREADS,
302 .flush = ff_mpeg_flush,
303 .pix_fmts = (const enum AVPixelFormat[]) {
304 AV_PIX_FMT_YUV420P,
305 AV_PIX_FMT_NONE
306 },
307 .init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),
308 .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),
309};
310
generated by cgit at 2024-05-17 01:48:45 (GMT)