Statistics
| Branch: | Revision:

ffmpeg / libavcodec / rv30.c @ 2912e87a

History | View | Annotate | Download (9.61 KB)

1 79cf2c7e Kostya Shishkov
/*
2
 * RV30 decoder
3
 * Copyright (c) 2007 Konstantin Shishkov
4
 *
5 2912e87a Mans Rullgard
 * This file is part of Libav.
6 79cf2c7e Kostya Shishkov
 *
7 2912e87a Mans Rullgard
 * Libav is free software; you can redistribute it and/or
8 79cf2c7e Kostya Shishkov
 * 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 2912e87a Mans Rullgard
 * Libav is distributed in the hope that it will be useful,
13 79cf2c7e Kostya Shishkov
 * 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 2912e87a Mans Rullgard
 * License along with Libav; if not, write to the Free Software
19 79cf2c7e Kostya Shishkov
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21
22
/**
23 ba87f080 Diego Biurrun
 * @file
24 a660c52a Diego Biurrun
 * RV30 decoder
25 79cf2c7e Kostya Shishkov
 */
26
27
#include "avcodec.h"
28
#include "dsputil.h"
29
#include "mpegvideo.h"
30 4978618b Kostya Shishkov
#include "golomb.h"
31 79cf2c7e Kostya Shishkov
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
    int mb_bits;
39
    int w = r->s.width, h = r->s.height;
40
    int mb_size;
41 6751a00a Kostya Shishkov
    int rpr;
42 79cf2c7e Kostya Shishkov
43
    memset(si, 0, sizeof(SliceInfo));
44 42d6c3ba Kostya Shishkov
    if(get_bits(gb, 3))
45
        return -1;
46 79cf2c7e Kostya Shishkov
    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 39902a8c Kostya Shishkov
    si->pts = get_bits(gb, 13);
53 6751a00a Kostya Shishkov
    rpr = get_bits(gb, r->rpr);
54 42b7678d Kostya Shishkov
    if(rpr){
55
        w = r->s.avctx->extradata[6 + rpr*2] << 2;
56
        h = r->s.avctx->extradata[7 + rpr*2] << 2;
57 6751a00a Kostya Shishkov
    }
58 42b7678d Kostya Shishkov
    si->width  = w;
59
    si->height = h;
60 79cf2c7e Kostya Shishkov
    mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
61
    mb_bits = ff_rv34_get_start_offset(gb, mb_size);
62
    si->start = get_bits(gb, mb_bits);
63
    skip_bits1(gb);
64
    return 0;
65
}
66
67
/**
68 a660c52a Diego Biurrun
 * Decode 4x4 intra types array.
69 79cf2c7e Kostya Shishkov
 */
70 ea61e33a Kostya Shishkov
static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
71 79cf2c7e Kostya Shishkov
{
72
    int i, j, k;
73
74 39c601b5 Kostya Shishkov
    for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
75 79cf2c7e Kostya Shishkov
        for(j = 0; j < 4; j+= 2){
76 4978618b Kostya Shishkov
            int code = svq3_get_ue_golomb(gb) << 1;
77 79cf2c7e Kostya Shishkov
            if(code >= 81*2){
78
                av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
79
                return -1;
80
            }
81
            for(k = 0; k < 2; k++){
82 39c601b5 Kostya Shishkov
                int A = dst[-r->intra_types_stride] + 1;
83 79cf2c7e Kostya Shishkov
                int B = dst[-1] + 1;
84
                *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
85
                if(dst[-1] == 9){
86
                    av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
87
                    return -1;
88
                }
89
            }
90
        }
91
    }
92
    return 0;
93
}
94
95
/**
96 a660c52a Diego Biurrun
 * Decode macroblock information.
97 79cf2c7e Kostya Shishkov
 */
98
static int rv30_decode_mb_info(RV34DecContext *r)
99
{
100
    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 };
101
    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 };
102
    MpegEncContext *s = &r->s;
103
    GetBitContext *gb = &s->gb;
104 4978618b Kostya Shishkov
    int code = svq3_get_ue_golomb(gb);
105 79cf2c7e Kostya Shishkov
106
    if(code > 11){
107
        av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
108
        return -1;
109
    }
110
    if(code > 5){
111
        av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
112
        code -= 6;
113
    }
114 9701840b Aurelien Jacobs
    if(s->pict_type != FF_B_TYPE)
115 79cf2c7e Kostya Shishkov
        return rv30_p_types[code];
116
    else
117
        return rv30_b_types[code];
118
}
119
120 541e8f3b Kostya Shishkov
static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
121
                                         const int stride, const int lim)
122
{
123
    uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
124
    int i, diff;
125
126
    for(i = 0; i < 4; i++){
127
        diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
128
        diff = av_clip(diff, -lim, lim);
129
        src[-1*step] = cm[src[-1*step] + diff];
130
        src[ 0*step] = cm[src[ 0*step] - diff];
131
        src += stride;
132
    }
133
}
134
135
static void rv30_loop_filter(RV34DecContext *r, int row)
136
{
137
    MpegEncContext *s = &r->s;
138
    int mb_pos, mb_x;
139
    int i, j, k;
140
    uint8_t *Y, *C;
141
    int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
142
143
    mb_pos = row * s->mb_stride;
144
    for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
145
        int mbtype = s->current_picture_ptr->mb_type[mb_pos];
146
        if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
147
            r->deblock_coefs[mb_pos] = 0xFFFF;
148
        if(IS_INTRA(mbtype))
149
            r->cbp_chroma[mb_pos] = 0xFF;
150
    }
151
152
    /* all vertical edges are filtered first
153
     * and horizontal edges are filtered on the next iteration
154
     */
155
    mb_pos = row * s->mb_stride;
156
    for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
157
        cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
158
        if(mb_x)
159
            left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
160
        for(j = 0; j < 16; j += 4){
161
            Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
162
            for(i = !mb_x; i < 4; i++, Y += 4){
163
                int ij = i + j;
164
                loc_lim = 0;
165
                if(r->deblock_coefs[mb_pos] & (1 << ij))
166
                    loc_lim = cur_lim;
167
                else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
168
                    loc_lim = left_lim;
169
                else if( i && r->deblock_coefs[mb_pos]     & (1 << (ij - 1)))
170
                    loc_lim = cur_lim;
171
                if(loc_lim)
172
                    rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
173
            }
174
        }
175
        for(k = 0; k < 2; k++){
176
            int cur_cbp, left_cbp = 0;
177
            cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
178
            if(mb_x)
179
                left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
180
            for(j = 0; j < 8; j += 4){
181
                C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
182
                for(i = !mb_x; i < 2; i++, C += 4){
183
                    int ij = i + (j >> 1);
184
                    loc_lim = 0;
185
                    if(cur_cbp && (1 << ij))
186
                        loc_lim = cur_lim;
187
                    else if(!i && left_cbp & (1 << (ij + 1)))
188
                        loc_lim = left_lim;
189
                    else if( i && cur_cbp  & (1 << (ij - 1)))
190
                        loc_lim = cur_lim;
191
                    if(loc_lim)
192
                        rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
193
                }
194
            }
195
        }
196
    }
197
    mb_pos = row * s->mb_stride;
198
    for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
199
        cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
200
        if(row)
201
            top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
202
        for(j = 4*!row; j < 16; j += 4){
203
            Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
204
            for(i = 0; i < 4; i++, Y += 4){
205
                int ij = i + j;
206
                loc_lim = 0;
207
                if(r->deblock_coefs[mb_pos] & (1 << ij))
208
                    loc_lim = cur_lim;
209
                else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
210
                    loc_lim = top_lim;
211
                else if( j && r->deblock_coefs[mb_pos]                & (1 << (ij - 4)))
212
                    loc_lim = cur_lim;
213
                if(loc_lim)
214
                    rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
215
            }
216
        }
217
        for(k = 0; k < 2; k++){
218
            int cur_cbp, top_cbp = 0;
219
            cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
220
            if(row)
221
                top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
222
            for(j = 4*!row; j < 8; j += 4){
223
                C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
224
                for(i = 0; i < 2; i++, C += 4){
225
                    int ij = i + (j >> 1);
226
                    loc_lim = 0;
227
                    if(r->cbp_chroma[mb_pos] && (1 << ij))
228
                        loc_lim = cur_lim;
229
                    else if(!j && top_cbp & (1 << (ij + 2)))
230
                        loc_lim = top_lim;
231
                    else if( j && cur_cbp & (1 << (ij - 2)))
232
                        loc_lim = cur_lim;
233
                    if(loc_lim)
234
                        rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
235
                }
236
            }
237
        }
238
    }
239
}
240
241 79cf2c7e Kostya Shishkov
/**
242 a660c52a Diego Biurrun
 * Initialize decoder.
243 79cf2c7e Kostya Shishkov
 */
244 98a6fff9 Zuxy Meng
static av_cold int rv30_decode_init(AVCodecContext *avctx)
245 79cf2c7e Kostya Shishkov
{
246
    RV34DecContext *r = avctx->priv_data;
247
248
    r->rv30 = 1;
249
    ff_rv34_decode_init(avctx);
250
    if(avctx->extradata_size < 2){
251 a660c52a Diego Biurrun
        av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
252 79cf2c7e Kostya Shishkov
        return -1;
253
    }
254
    r->rpr = (avctx->extradata[1] & 7) >> 1;
255
    r->rpr = FFMIN(r->rpr + 1, 3);
256 6751a00a Kostya Shishkov
    if(avctx->extradata_size - 8 < (r->rpr - 1) * 2){
257
        av_log(avctx, AV_LOG_ERROR, "Insufficient extradata - need at least %d bytes, got %d\n",
258
               6 + r->rpr * 2, avctx->extradata_size);
259
    }
260 79cf2c7e Kostya Shishkov
    r->parse_slice_header = rv30_parse_slice_header;
261
    r->decode_intra_types = rv30_decode_intra_types;
262
    r->decode_mb_info     = rv30_decode_mb_info;
263 541e8f3b Kostya Shishkov
    r->loop_filter        = rv30_loop_filter;
264 79cf2c7e Kostya Shishkov
    r->luma_dc_quant_i = rv30_luma_dc_quant;
265
    r->luma_dc_quant_p = rv30_luma_dc_quant;
266
    return 0;
267
}
268
269 d36beb3f Diego Elio Pettenò
AVCodec ff_rv30_decoder = {
270 79cf2c7e Kostya Shishkov
    "rv30",
271 72415b2a Stefano Sabatini
    AVMEDIA_TYPE_VIDEO,
272 79cf2c7e Kostya Shishkov
    CODEC_ID_RV30,
273
    sizeof(RV34DecContext),
274
    rv30_decode_init,
275
    NULL,
276
    ff_rv34_decode_end,
277
    ff_rv34_decode_frame,
278 52b91753 Kostya Shishkov
    CODEC_CAP_DR1 | CODEC_CAP_DELAY,
279 186f155e Kostya Shishkov
    .flush = ff_mpeg_flush,
280 fe4bf374 Stefano Sabatini
    .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
281 09a9b45e Michael Niedermayer
    .pix_fmts= ff_pixfmt_list_420,
282 79cf2c7e Kostya Shishkov
};