Statistics
| Branch: | Revision:

ffmpeg / libavcodec / vp5.c @ 2912e87a

History | View | Annotate | Download (9.92 KB)

1
/**
2
 * @file
3
 * VP5 compatible video decoder
4
 *
5
 * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
6
 *
7
 * This file is part of Libav.
8
 *
9
 * Libav is free software; you can redistribute it and/or
10
 * modify it under the terms of the GNU Lesser General Public
11
 * License as published by the Free Software Foundation; either
12
 * version 2.1 of the License, or (at your option) any later version.
13
 *
14
 * Libav is distributed in the hope that it will be useful,
15
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17
 * Lesser General Public License for more details.
18
 *
19
 * You should have received a copy of the GNU Lesser General Public
20
 * License along with Libav; if not, write to the Free Software
21
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22
 */
23

    
24
#include <stdlib.h>
25
#include <string.h>
26

    
27
#include "avcodec.h"
28
#include "dsputil.h"
29
#include "get_bits.h"
30

    
31
#include "vp56.h"
32
#include "vp56data.h"
33
#include "vp5data.h"
34

    
35

    
36
static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
37
                            int *golden_frame)
38
{
39
    VP56RangeCoder *c = &s->c;
40
    int rows, cols;
41

    
42
    ff_vp56_init_range_decoder(&s->c, buf, buf_size);
43
    s->framep[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
44
    vp56_rac_get(c);
45
    ff_vp56_init_dequant(s, vp56_rac_gets(c, 6));
46
    if (s->framep[VP56_FRAME_CURRENT]->key_frame)
47
    {
48
        vp56_rac_gets(c, 8);
49
        if(vp56_rac_gets(c, 5) > 5)
50
            return 0;
51
        vp56_rac_gets(c, 2);
52
        if (vp56_rac_get(c)) {
53
            av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
54
            return 0;
55
        }
56
        rows = vp56_rac_gets(c, 8);  /* number of stored macroblock rows */
57
        cols = vp56_rac_gets(c, 8);  /* number of stored macroblock cols */
58
        vp56_rac_gets(c, 8);  /* number of displayed macroblock rows */
59
        vp56_rac_gets(c, 8);  /* number of displayed macroblock cols */
60
        vp56_rac_gets(c, 2);
61
        if (!s->macroblocks || /* first frame */
62
            16*cols != s->avctx->coded_width ||
63
            16*rows != s->avctx->coded_height) {
64
            avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
65
            return 2;
66
        }
67
    } else if (!s->macroblocks)
68
        return 0;
69
    return 1;
70
}
71

    
72
static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
73
{
74
    VP56RangeCoder *c = &s->c;
75
    VP56Model *model = s->modelp;
76
    int comp, di;
77

    
78
    for (comp=0; comp<2; comp++) {
79
        int delta = 0;
80
        if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
81
            int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
82
            di  = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
83
            di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
84
            delta = vp56_rac_get_tree(c, vp56_pva_tree,
85
                                      model->vector_pdv[comp]);
86
            delta = di | (delta << 2);
87
            delta = (delta ^ -sign) + sign;
88
        }
89
        if (!comp)
90
            vect->x = delta;
91
        else
92
            vect->y = delta;
93
    }
94
}
95

    
96
static void vp5_parse_vector_models(VP56Context *s)
97
{
98
    VP56RangeCoder *c = &s->c;
99
    VP56Model *model = s->modelp;
100
    int comp, node;
101

    
102
    for (comp=0; comp<2; comp++) {
103
        if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][0]))
104
            model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
105
        if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][1]))
106
            model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
107
        if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][2]))
108
            model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
109
        if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][3]))
110
            model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
111
    }
112

    
113
    for (comp=0; comp<2; comp++)
114
        for (node=0; node<7; node++)
115
            if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][4 + node]))
116
                model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
117
}
118

    
119
static void vp5_parse_coeff_models(VP56Context *s)
120
{
121
    VP56RangeCoder *c = &s->c;
122
    VP56Model *model = s->modelp;
123
    uint8_t def_prob[11];
124
    int node, cg, ctx;
125
    int ct;    /* code type */
126
    int pt;    /* plane type (0 for Y, 1 for U or V) */
127

    
128
    memset(def_prob, 0x80, sizeof(def_prob));
129

    
130
    for (pt=0; pt<2; pt++)
131
        for (node=0; node<11; node++)
132
            if (vp56_rac_get_prob(c, vp5_dccv_pct[pt][node])) {
133
                def_prob[node] = vp56_rac_gets_nn(c, 7);
134
                model->coeff_dccv[pt][node] = def_prob[node];
135
            } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
136
                model->coeff_dccv[pt][node] = def_prob[node];
137
            }
138

    
139
    for (ct=0; ct<3; ct++)
140
        for (pt=0; pt<2; pt++)
141
            for (cg=0; cg<6; cg++)
142
                for (node=0; node<11; node++)
143
                    if (vp56_rac_get_prob(c, vp5_ract_pct[ct][pt][cg][node])) {
144
                        def_prob[node] = vp56_rac_gets_nn(c, 7);
145
                        model->coeff_ract[pt][ct][cg][node] = def_prob[node];
146
                    } else if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
147
                        model->coeff_ract[pt][ct][cg][node] = def_prob[node];
148
                    }
149

    
150
    /* coeff_dcct is a linear combination of coeff_dccv */
151
    for (pt=0; pt<2; pt++)
152
        for (ctx=0; ctx<36; ctx++)
153
            for (node=0; node<5; node++)
154
                model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp5_dccv_lc[node][ctx][0] + 128) >> 8) + vp5_dccv_lc[node][ctx][1], 1, 254);
155

    
156
    /* coeff_acct is a linear combination of coeff_ract */
157
    for (ct=0; ct<3; ct++)
158
        for (pt=0; pt<2; pt++)
159
            for (cg=0; cg<3; cg++)
160
                for (ctx=0; ctx<6; ctx++)
161
                    for (node=0; node<5; node++)
162
                        model->coeff_acct[pt][ct][cg][ctx][node] = av_clip(((model->coeff_ract[pt][ct][cg][node] * vp5_ract_lc[ct][cg][node][ctx][0] + 128) >> 8) + vp5_ract_lc[ct][cg][node][ctx][1], 1, 254);
163
}
164

    
165
static void vp5_parse_coeff(VP56Context *s)
166
{
167
    VP56RangeCoder *c = &s->c;
168
    VP56Model *model = s->modelp;
169
    uint8_t *permute = s->scantable.permutated;
170
    uint8_t *model1, *model2;
171
    int coeff, sign, coeff_idx;
172
    int b, i, cg, idx, ctx, ctx_last;
173
    int pt = 0;    /* plane type (0 for Y, 1 for U or V) */
174

    
175
    for (b=0; b<6; b++) {
176
        int ct = 1;    /* code type */
177

    
178
        if (b > 3) pt = 1;
179

    
180
        ctx = 6*s->coeff_ctx[vp56_b6to4[b]][0]
181
              + s->above_blocks[s->above_block_idx[b]].not_null_dc;
182
        model1 = model->coeff_dccv[pt];
183
        model2 = model->coeff_dcct[pt][ctx];
184

    
185
        for (coeff_idx=0; coeff_idx<64; ) {
186
            if (vp56_rac_get_prob(c, model2[0])) {
187
                if (vp56_rac_get_prob(c, model2[2])) {
188
                    if (vp56_rac_get_prob(c, model2[3])) {
189
                        s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 4;
190
                        idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
191
                        sign = vp56_rac_get(c);
192
                        coeff = vp56_coeff_bias[idx+5];
193
                        for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
194
                            coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
195
                    } else {
196
                        if (vp56_rac_get_prob(c, model2[4])) {
197
                            coeff = 3 + vp56_rac_get_prob(c, model1[5]);
198
                            s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 3;
199
                        } else {
200
                            coeff = 2;
201
                            s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 2;
202
                        }
203
                        sign = vp56_rac_get(c);
204
                    }
205
                    ct = 2;
206
                } else {
207
                    ct = 1;
208
                    s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 1;
209
                    sign = vp56_rac_get(c);
210
                    coeff = 1;
211
                }
212
                coeff = (coeff ^ -sign) + sign;
213
                if (coeff_idx)
214
                    coeff *= s->dequant_ac;
215
                s->block_coeff[b][permute[coeff_idx]] = coeff;
216
            } else {
217
                if (ct && !vp56_rac_get_prob(c, model2[1]))
218
                    break;
219
                ct = 0;
220
                s->coeff_ctx[vp56_b6to4[b]][coeff_idx] = 0;
221
            }
222

    
223
            cg = vp5_coeff_groups[++coeff_idx];
224
            ctx = s->coeff_ctx[vp56_b6to4[b]][coeff_idx];
225
            model1 = model->coeff_ract[pt][ct][cg];
226
            model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
227
        }
228

    
229
        ctx_last = FFMIN(s->coeff_ctx_last[vp56_b6to4[b]], 24);
230
        s->coeff_ctx_last[vp56_b6to4[b]] = coeff_idx;
231
        if (coeff_idx < ctx_last)
232
            for (i=coeff_idx; i<=ctx_last; i++)
233
                s->coeff_ctx[vp56_b6to4[b]][i] = 5;
234
        s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[vp56_b6to4[b]][0];
235
    }
236
}
237

    
238
static void vp5_default_models_init(VP56Context *s)
239
{
240
    VP56Model *model = s->modelp;
241
    int i;
242

    
243
    for (i=0; i<2; i++) {
244
        model->vector_sig[i] = 0x80;
245
        model->vector_dct[i] = 0x80;
246
        model->vector_pdi[i][0] = 0x55;
247
        model->vector_pdi[i][1] = 0x80;
248
    }
249
    memcpy(model->mb_types_stats, vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
250
    memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
251
}
252

    
253
static av_cold int vp5_decode_init(AVCodecContext *avctx)
254
{
255
    VP56Context *s = avctx->priv_data;
256

    
257
    ff_vp56_init(avctx, 1, 0);
258
    s->vp56_coord_div = vp5_coord_div;
259
    s->parse_vector_adjustment = vp5_parse_vector_adjustment;
260
    s->parse_coeff = vp5_parse_coeff;
261
    s->default_models_init = vp5_default_models_init;
262
    s->parse_vector_models = vp5_parse_vector_models;
263
    s->parse_coeff_models = vp5_parse_coeff_models;
264
    s->parse_header = vp5_parse_header;
265

    
266
    return 0;
267
}
268

    
269
AVCodec ff_vp5_decoder = {
270
    "vp5",
271
    AVMEDIA_TYPE_VIDEO,
272
    CODEC_ID_VP5,
273
    sizeof(VP56Context),
274
    vp5_decode_init,
275
    NULL,
276
    ff_vp56_free,
277
    ff_vp56_decode_frame,
278
    CODEC_CAP_DR1,
279
    .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),
280
};