1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
|
/*
* RV30 decoder
* Copyright (c) 2007 Konstantin Shishkov
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* RV30 decoder
*/
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "golomb.h"
#include "rv34.h"
#include "rv30data.h"
static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
{
AVCodecContext *avctx = r->s.avctx;
int mb_bits;
int w = r->s.width, h = r->s.height;
int mb_size;
int rpr;
memset(si, 0, sizeof(SliceInfo));
if(get_bits(gb, 3))
return -1;
si->type = get_bits(gb, 2);
if(si->type == 1) si->type = 0;
if(get_bits1(gb))
return -1;
si->quant = get_bits(gb, 5);
skip_bits1(gb);
si->pts = get_bits(gb, 13);
rpr = get_bits(gb, r->rpr);
if(rpr){
if (avctx->extradata_size < rpr * 2 + 8) {
av_log(avctx, AV_LOG_ERROR,
"Insufficient extradata - need at least %d bytes, got %d\n",
8 + rpr * 2, avctx->extradata_size);
return AVERROR(EINVAL);
}
w = r->s.avctx->extradata[6 + rpr*2] << 2;
h = r->s.avctx->extradata[7 + rpr*2] << 2;
}
si->width = w;
si->height = h;
mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
mb_bits = ff_rv34_get_start_offset(gb, mb_size);
si->start = get_bits(gb, mb_bits);
skip_bits1(gb);
return 0;
}
/**
* Decode 4x4 intra types array.
*/
static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
{
int i, j, k;
for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
for(j = 0; j < 4; j+= 2){
unsigned code = svq3_get_ue_golomb(gb) << 1;
if(code >= 81*2){
av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
return -1;
}
for(k = 0; k < 2; k++){
int A = dst[-r->intra_types_stride] + 1;
int B = dst[-1] + 1;
*dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
if(dst[-1] == 9){
av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
return -1;
}
}
}
}
return 0;
}
/**
* Decode macroblock information.
*/
static int rv30_decode_mb_info(RV34DecContext *r)
{
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 };
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 };
MpegEncContext *s = &r->s;
GetBitContext *gb = &s->gb;
unsigned code = svq3_get_ue_golomb(gb);
if (code > 11) {
av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
return -1;
}
if(code > 5){
av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
code -= 6;
}
if(s->pict_type != AV_PICTURE_TYPE_B)
return rv30_p_types[code];
else
return rv30_b_types[code];
}
static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
const int stride, const int lim)
{
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
int i, diff;
for(i = 0; i < 4; i++){
diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
diff = av_clip(diff, -lim, lim);
src[-1*step] = cm[src[-1*step] + diff];
src[ 0*step] = cm[src[ 0*step] - diff];
src += stride;
}
}
static void rv30_loop_filter(RV34DecContext *r, int row)
{
MpegEncContext *s = &r->s;
int mb_pos, mb_x;
int i, j, k;
uint8_t *Y, *C;
int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
mb_pos = row * s->mb_stride;
for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
int mbtype = s->current_picture_ptr->f.mb_type[mb_pos];
if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
r->deblock_coefs[mb_pos] = 0xFFFF;
if(IS_INTRA(mbtype))
r->cbp_chroma[mb_pos] = 0xFF;
}
/* all vertical edges are filtered first
* and horizontal edges are filtered on the next iteration
*/
mb_pos = row * s->mb_stride;
for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos]];
if(mb_x)
left_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos - 1]];
for(j = 0; j < 16; j += 4){
Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
for(i = !mb_x; i < 4; i++, Y += 4){
int ij = i + j;
loc_lim = 0;
if(r->deblock_coefs[mb_pos] & (1 << ij))
loc_lim = cur_lim;
else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
loc_lim = left_lim;
else if( i && r->deblock_coefs[mb_pos] & (1 << (ij - 1)))
loc_lim = cur_lim;
if(loc_lim)
rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
}
}
for(k = 0; k < 2; k++){
int cur_cbp, left_cbp = 0;
cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
if(mb_x)
left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
for(j = 0; j < 8; j += 4){
C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
for(i = !mb_x; i < 2; i++, C += 4){
int ij = i + (j >> 1);
loc_lim = 0;
if (cur_cbp & (1 << ij))
loc_lim = cur_lim;
else if(!i && left_cbp & (1 << (ij + 1)))
loc_lim = left_lim;
else if( i && cur_cbp & (1 << (ij - 1)))
loc_lim = cur_lim;
if(loc_lim)
rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
}
}
}
}
mb_pos = row * s->mb_stride;
for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos]];
if(row)
top_lim = rv30_loop_filt_lim[s->current_picture_ptr->f.qscale_table[mb_pos - s->mb_stride]];
for(j = 4*!row; j < 16; j += 4){
Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;
for(i = 0; i < 4; i++, Y += 4){
int ij = i + j;
loc_lim = 0;
if(r->deblock_coefs[mb_pos] & (1 << ij))
loc_lim = cur_lim;
else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
loc_lim = top_lim;
else if( j && r->deblock_coefs[mb_pos] & (1 << (ij - 4)))
loc_lim = cur_lim;
if(loc_lim)
rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
}
}
for(k = 0; k < 2; k++){
int cur_cbp, top_cbp = 0;
cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
if(row)
top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
for(j = 4*!row; j < 8; j += 4){
C = s->current_picture_ptr->f.data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
for(i = 0; i < 2; i++, C += 4){
int ij = i + (j >> 1);
loc_lim = 0;
if (r->cbp_chroma[mb_pos] & (1 << ij))
loc_lim = cur_lim;
else if(!j && top_cbp & (1 << (ij + 2)))
loc_lim = top_lim;
else if( j && cur_cbp & (1 << (ij - 2)))
loc_lim = cur_lim;
if(loc_lim)
rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
}
}
}
}
}
/**
* Initialize decoder.
*/
static av_cold int rv30_decode_init(AVCodecContext *avctx)
{
RV34DecContext *r = avctx->priv_data;
int ret;
r->rv30 = 1;
if ((ret = ff_rv34_decode_init(avctx)) < 0)
return ret;
if(avctx->extradata_size < 2){
av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
return -1;
}
r->rpr = (avctx->extradata[1] & 7) >> 1;
r->rpr = FFMIN(r->rpr + 1, 3);
r->parse_slice_header = rv30_parse_slice_header;
r->decode_intra_types = rv30_decode_intra_types;
r->decode_mb_info = rv30_decode_mb_info;
r->loop_filter = rv30_loop_filter;
r->luma_dc_quant_i = rv30_luma_dc_quant;
r->luma_dc_quant_p = rv30_luma_dc_quant;
return 0;
}
AVCodec ff_rv30_decoder = {
.name = "rv30",
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_RV30,
.priv_data_size = sizeof(RV34DecContext),
.init = rv30_decode_init,
.close = ff_rv34_decode_end,
.decode = ff_rv34_decode_frame,
.capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY |
CODEC_CAP_FRAME_THREADS,
.flush = ff_mpeg_flush,
.long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
.pix_fmts = ff_pixfmt_list_420,
.init_thread_copy = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),
.update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),
};
|