GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/vp56.h Lines: 79 79 100.0 %
Date: 2020-10-23 17:01:47 Branches: 28 28 100.0 %

Line Branch Exec Source
1
/*
2
 * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
3
 *
4
 * This file is part of FFmpeg.
5
 *
6
 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
10
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14
 * Lesser General Public License for more details.
15
 *
16
 * You should have received a copy of the GNU Lesser General Public
17
 * License along with FFmpeg; if not, write to the Free Software
18
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19
 */
20
21
/**
22
 * @file
23
 * VP5 and VP6 compatible video decoder (common features)
24
 */
25
26
#ifndef AVCODEC_VP56_H
27
#define AVCODEC_VP56_H
28
29
#include "avcodec.h"
30
#include "get_bits.h"
31
#include "hpeldsp.h"
32
#include "bytestream.h"
33
#include "h264chroma.h"
34
#include "videodsp.h"
35
#include "vp3dsp.h"
36
#include "vp56dsp.h"
37
38
typedef struct vp56_context VP56Context;
39
40
typedef enum {
41
    VP56_FRAME_NONE     =-1,
42
    VP56_FRAME_CURRENT  = 0,
43
    VP56_FRAME_PREVIOUS = 1,
44
    VP56_FRAME_GOLDEN   = 2,
45
    VP56_FRAME_GOLDEN2  = 3,
46
} VP56Frame;
47
48
typedef enum {
49
    VP56_MB_INTER_NOVEC_PF = 0,  /**< Inter MB, no vector, from previous frame */
50
    VP56_MB_INTRA          = 1,  /**< Intra MB */
51
    VP56_MB_INTER_DELTA_PF = 2,  /**< Inter MB, above/left vector + delta, from previous frame */
52
    VP56_MB_INTER_V1_PF    = 3,  /**< Inter MB, first vector, from previous frame */
53
    VP56_MB_INTER_V2_PF    = 4,  /**< Inter MB, second vector, from previous frame */
54
    VP56_MB_INTER_NOVEC_GF = 5,  /**< Inter MB, no vector, from golden frame */
55
    VP56_MB_INTER_DELTA_GF = 6,  /**< Inter MB, above/left vector + delta, from golden frame */
56
    VP56_MB_INTER_4V       = 7,  /**< Inter MB, 4 vectors, from previous frame */
57
    VP56_MB_INTER_V1_GF    = 8,  /**< Inter MB, first vector, from golden frame */
58
    VP56_MB_INTER_V2_GF    = 9,  /**< Inter MB, second vector, from golden frame */
59
} VP56mb;
60
61
typedef struct VP56Tree {
62
  int8_t val;
63
  int8_t prob_idx;
64
} VP56Tree;
65
66
typedef struct VP56mv {
67
    DECLARE_ALIGNED(4, int16_t, x);
68
    int16_t y;
69
} VP56mv;
70
71
#define VP56_SIZE_CHANGE 1
72
73
typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
74
                                          VP56mv *vect);
75
typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
76
                           int offset1, int offset2, ptrdiff_t stride,
77
                           VP56mv mv, int mask, int select, int luma);
78
typedef int  (*VP56ParseCoeff)(VP56Context *s);
79
typedef void (*VP56DefaultModelsInit)(VP56Context *s);
80
typedef void (*VP56ParseVectorModels)(VP56Context *s);
81
typedef int  (*VP56ParseCoeffModels)(VP56Context *s);
82
typedef int  (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
83
                                int buf_size);
84
85
typedef struct VP56RangeCoder {
86
    int high;
87
    int bits; /* stored negated (i.e. negative "bits" is a positive number of
88
                 bits left) in order to eliminate a negate in cache refilling */
89
    const uint8_t *buffer;
90
    const uint8_t *end;
91
    unsigned int code_word;
92
    int end_reached;
93
} VP56RangeCoder;
94
95
typedef struct VP56RefDc {
96
    uint8_t not_null_dc;
97
    VP56Frame ref_frame;
98
    int16_t dc_coeff;
99
} VP56RefDc;
100
101
typedef struct VP56Macroblock {
102
    uint8_t type;
103
    VP56mv mv;
104
} VP56Macroblock;
105
106
typedef struct VP56Model {
107
    uint8_t coeff_reorder[64];       /* used in vp6 only */
108
    uint8_t coeff_index_to_pos[64];  /* used in vp6 only */
109
    uint8_t coeff_index_to_idct_selector[64]; /* used in vp6 only */
110
    uint8_t vector_sig[2];           /* delta sign */
111
    uint8_t vector_dct[2];           /* delta coding types */
112
    uint8_t vector_pdi[2][2];        /* predefined delta init */
113
    uint8_t vector_pdv[2][7];        /* predefined delta values */
114
    uint8_t vector_fdv[2][8];        /* 8 bit delta value definition */
115
    uint8_t coeff_dccv[2][11];       /* DC coeff value */
116
    uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
117
    uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
118
    uint8_t coeff_dcct[2][36][5];    /* DC coeff coding type */
119
    uint8_t coeff_runv[2][14];       /* run value (vp6 only) */
120
    uint8_t mb_type[3][10][10];      /* model for decoding MB type */
121
    uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
122
} VP56Model;
123
124
struct vp56_context {
125
    AVCodecContext *avctx;
126
    H264ChromaContext h264chroma;
127
    HpelDSPContext hdsp;
128
    VideoDSPContext vdsp;
129
    VP3DSPContext vp3dsp;
130
    VP56DSPContext vp56dsp;
131
    uint8_t idct_scantable[64];
132
    AVFrame *frames[4];
133
    uint8_t *edge_emu_buffer_alloc;
134
    uint8_t *edge_emu_buffer;
135
    VP56RangeCoder c;
136
    VP56RangeCoder cc;
137
    VP56RangeCoder *ccp;
138
    int sub_version;
139
140
    /* frame info */
141
    int golden_frame;
142
    int plane_width[4];
143
    int plane_height[4];
144
    int mb_width;   /* number of horizontal MB */
145
    int mb_height;  /* number of vertical MB */
146
    int block_offset[6];
147
148
    int quantizer;
149
    uint16_t dequant_dc;
150
    uint16_t dequant_ac;
151
152
    /* DC predictors management */
153
    VP56RefDc *above_blocks;
154
    VP56RefDc left_block[4];
155
    int above_block_idx[6];
156
    int16_t prev_dc[3][3];    /* [plan][ref_frame] */
157
158
    /* blocks / macroblock */
159
    VP56mb mb_type;
160
    VP56Macroblock *macroblocks;
161
    DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
162
    int idct_selector[6];
163
164
    /* motion vectors */
165
    VP56mv mv[6];  /* vectors for each block in MB */
166
    VP56mv vector_candidate[2];
167
    int vector_candidate_pos;
168
169
    /* filtering hints */
170
    int filter_header;               /* used in vp6 only */
171
    int deblock_filtering;
172
    int filter_selection;
173
    int filter_mode;
174
    int max_vector_length;
175
    int sample_variance_threshold;
176
    DECLARE_ALIGNED(8, int, bounding_values_array)[256];
177
178
    uint8_t coeff_ctx[4][64];              /* used in vp5 only */
179
    uint8_t coeff_ctx_last[4];             /* used in vp5 only */
180
181
    int has_alpha;
182
183
    /* upside-down flipping hints */
184
    int flip;  /* are we flipping ? */
185
    int frbi;  /* first row block index in MB */
186
    int srbi;  /* second row block index in MB */
187
    ptrdiff_t stride[4];  /* stride for each plan */
188
189
    const uint8_t *vp56_coord_div;
190
    VP56ParseVectorAdjustment parse_vector_adjustment;
191
    VP56Filter filter;
192
    VP56ParseCoeff parse_coeff;
193
    VP56DefaultModelsInit default_models_init;
194
    VP56ParseVectorModels parse_vector_models;
195
    VP56ParseCoeffModels parse_coeff_models;
196
    VP56ParseHeader parse_header;
197
198
    /* for "slice" parallelism between YUV and A */
199
    VP56Context *alpha_context;
200
201
    VP56Model *modelp;
202
    VP56Model model;
203
204
    /* huffman decoding */
205
    int use_huffman;
206
    GetBitContext gb;
207
    VLC dccv_vlc[2];
208
    VLC runv_vlc[2];
209
    VLC ract_vlc[2][3][6];
210
    unsigned int nb_null[2][2];       /* number of consecutive NULL DC/AC */
211
212
    int have_undamaged_frame;
213
    int discard_frame;
214
};
215
216
217
int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
218
int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
219
                          int flip, int has_alpha);
220
int ff_vp56_free(AVCodecContext *avctx);
221
int ff_vp56_free_context(VP56Context *s);
222
void ff_vp56_init_dequant(VP56Context *s, int quantizer);
223
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
224
                         AVPacket *avpkt);
225
226
227
/**
228
 * vp56 specific range coder implementation
229
 */
230
231
extern const uint8_t ff_vp56_norm_shift[256];
232
int ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
233
234
/**
235
 * vp5689 returns 1 if the end of the stream has been reached, 0 otherwise.
236
 */
237
739911
static av_always_inline int vpX_rac_is_end(VP56RangeCoder *c)
238
{
239

739911
    if (c->end <= c->buffer && c->bits >= 0)
240
11
        c->end_reached ++;
241
739911
    return c->end_reached > 10;
242
}
243
244
97273225
static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
245
{
246
97273225
    int shift = ff_vp56_norm_shift[c->high];
247
97273225
    int bits = c->bits;
248
97273225
    unsigned int code_word = c->code_word;
249
250
97273225
    c->high   <<= shift;
251
97273225
    code_word <<= shift;
252
97273225
    bits       += shift;
253

97273225
    if(bits >= 0 && c->buffer < c->end) {
254
4198198
        code_word |= bytestream_get_be16(&c->buffer) << bits;
255
4198198
        bits -= 16;
256
    }
257
97273225
    c->bits = bits;
258
97273225
    return code_word;
259
}
260
261
#if   ARCH_ARM
262
#include "arm/vp56_arith.h"
263
#elif ARCH_X86
264
#include "x86/vp56_arith.h"
265
#endif
266
267
#ifndef vp56_rac_get_prob
268
#define vp56_rac_get_prob vp56_rac_get_prob
269
static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
270
{
271
    unsigned int code_word = vp56_rac_renorm(c);
272
    unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
273
    unsigned int low_shift = low << 16;
274
    int bit = code_word >= low_shift;
275
276
    c->high = bit ? c->high - low : low;
277
    c->code_word = bit ? code_word - low_shift : code_word;
278
279
    return bit;
280
}
281
#endif
282
283
#ifndef vp56_rac_get_prob_branchy
284
// branchy variant, to be used where there's a branch based on the bit decoded
285
66664388
static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
286
{
287
66664388
    unsigned long code_word = vp56_rac_renorm(c);
288
66664388
    unsigned low = 1 + (((c->high - 1) * prob) >> 8);
289
66664388
    unsigned low_shift = low << 16;
290
291
66664388
    if (code_word >= low_shift) {
292
30814739
        c->high     -= low;
293
30814739
        c->code_word = code_word - low_shift;
294
30814739
        return 1;
295
    }
296
297
35849649
    c->high = low;
298
35849649
    c->code_word = code_word;
299
35849649
    return 0;
300
}
301
#endif
302
303
1303604
static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
304
{
305
1303604
    unsigned int code_word = vp56_rac_renorm(c);
306
    /* equiprobable */
307
1303604
    int low = (c->high + 1) >> 1;
308
1303604
    unsigned int low_shift = low << 16;
309
1303604
    int bit = code_word >= low_shift;
310
1303604
    if (bit) {
311
651693
        c->high   -= low;
312
651693
        code_word -= low_shift;
313
    } else {
314
651911
        c->high = low;
315
    }
316
317
1303604
    c->code_word = code_word;
318
1303604
    return bit;
319
}
320
321
// rounding is different than vp56_rac_get, is vp56_rac_get wrong?
322
10177309
static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
323
{
324
10177309
    return vp56_rac_get_prob(c, 128);
325
}
326
327
52237
static int vp56_rac_gets(VP56RangeCoder *c, int bits)
328
{
329
52237
    int value = 0;
330
331
203495
    while (bits--) {
332
151258
        value = (value << 1) | vp56_rac_get(c);
333
    }
334
335
52237
    return value;
336
}
337
338
48182
static int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
339
{
340
48182
    int value = 0;
341
342
292059
    while (bits--) {
343
243877
        value = (value << 1) | vp8_rac_get(c);
344
    }
345
346
48182
    return value;
347
}
348
349
// fixme: add 1 bit to all the calls to this?
350
6104
static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
351
{
352
    int v;
353
354
6104
    if (!vp8_rac_get(c))
355
5361
        return 0;
356
357
743
    v = vp8_rac_get_uint(c, bits);
358
359
743
    if (vp8_rac_get(c))
360
98
        v = -v;
361
362
743
    return v;
363
}
364
365
// P(7)
366
8496
static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
367
{
368
8496
    int v = vp56_rac_gets(c, 7) << 1;
369
8496
    return v + !v;
370
}
371
372
306
static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
373
{
374
306
    int v = vp8_rac_get_uint(c, 7) << 1;
375
306
    return v + !v;
376
}
377
378
static av_always_inline
379
445510
int vp56_rac_get_tree(VP56RangeCoder *c,
380
                      const VP56Tree *tree,
381
                      const uint8_t *probs)
382
{
383
1764929
    while (tree->val > 0) {
384
1319419
        if (vp56_rac_get_prob_branchy(c, probs[tree->prob_idx]))
385
450669
            tree += tree->val;
386
        else
387
868750
            tree++;
388
    }
389
445510
    return -tree->val;
390
}
391
392
// how probabilities are associated with decisions is different I think
393
// well, the new scheme fits in the old but this way has one fewer branches per decision
394
4225958
static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
395
                                   const uint8_t *probs)
396
{
397
4225958
    int i = 0;
398
399
    do {
400
9419020
        i = tree[i][vp56_rac_get_prob(c, probs[i])];
401
9419020
    } while (i > 0);
402
403
4225958
    return -i;
404
}
405
406
// DCTextra
407
43890
static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
408
{
409
43890
    int v = 0;
410
411
    do {
412
163810
        v = (v<<1) + vp56_rac_get_prob(c, *prob++);
413
163810
    } while (*prob);
414
415
43890
    return v;
416
}
417
418
#endif /* AVCODEC_VP56_H */