vp56.h 11.3 KB
Newer Older
1
/*
2 3
 * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
 *
4 5 6
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
7 8 9 10
 * 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.
 *
11
 * FFmpeg is distributed in the hope that it will be useful,
12 13 14 15 16
 * 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
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 23 24 25
/**
 * @file
 * VP5 and VP6 compatible video decoder (common features)
 */

26 27
#ifndef AVCODEC_VP56_H
#define AVCODEC_VP56_H
28 29

#include "dsputil.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 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
typedef enum {
    VP56_FRAME_NONE     =-1,
    VP56_FRAME_CURRENT  = 0,
    VP56_FRAME_PREVIOUS = 1,
    VP56_FRAME_GOLDEN   = 2,
    VP56_FRAME_GOLDEN2  = 3,
} VP56Frame;

typedef enum {
    VP56_MB_INTER_NOVEC_PF = 0,  /**< Inter MB, no vector, from previous frame */
    VP56_MB_INTRA          = 1,  /**< Intra MB */
    VP56_MB_INTER_DELTA_PF = 2,  /**< Inter MB, above/left vector + delta, from previous frame */
    VP56_MB_INTER_V1_PF    = 3,  /**< Inter MB, first vector, from previous frame */
    VP56_MB_INTER_V2_PF    = 4,  /**< Inter MB, second vector, from previous frame */
    VP56_MB_INTER_NOVEC_GF = 5,  /**< Inter MB, no vector, from golden frame */
    VP56_MB_INTER_DELTA_GF = 6,  /**< Inter MB, above/left vector + delta, from golden frame */
    VP56_MB_INTER_4V       = 7,  /**< Inter MB, 4 vectors, from previous frame */
    VP56_MB_INTER_V1_GF    = 8,  /**< Inter MB, first vector, from golden frame */
    VP56_MB_INTER_V2_GF    = 9,  /**< Inter MB, second vector, from golden frame */
} VP56mb;

typedef struct VP56Tree {
  int8_t val;
  int8_t prob_idx;
} VP56Tree;

66
typedef struct VP56mv {
67
    DECLARE_ALIGNED(4, int16_t, x);
68
    int16_t y;
69
} VP56mv;
70

71 72
#define VP56_SIZE_CHANGE 1

73
typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
74
                                          VP56mv *vect);
75
typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
76 77
                           int offset1, int offset2, int stride,
                           VP56mv mv, int mask, int select, int luma);
78 79 80
typedef void (*VP56ParseCoeff)(VP56Context *s);
typedef void (*VP56DefaultModelsInit)(VP56Context *s);
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 88
    int bits; /* stored negated (i.e. negative "bits" is a positive number of
                 bits left) in order to eliminate a negate in cache refilling */
Michael Niedermayer's avatar
Michael Niedermayer committed
89
    const uint8_t *buffer;
90
    const uint8_t *end;
91
    unsigned int code_word;
92
} VP56RangeCoder;
93

94
typedef struct VP56RefDc {
95
    uint8_t not_null_dc;
96
    VP56Frame ref_frame;
Diego Biurrun's avatar
Diego Biurrun committed
97
    int16_t dc_coeff;
98
} VP56RefDc;
99

100
typedef struct VP56Macroblock {
101
    uint8_t type;
102 103
    VP56mv mv;
} VP56Macroblock;
104

105
typedef struct VP56Model {
106 107 108 109 110 111 112 113 114 115 116 117 118 119
    uint8_t coeff_reorder[64];       /* used in vp6 only */
    uint8_t coeff_index_to_pos[64];  /* used in vp6 only */
    uint8_t vector_sig[2];           /* delta sign */
    uint8_t vector_dct[2];           /* delta coding types */
    uint8_t vector_pdi[2][2];        /* predefined delta init */
    uint8_t vector_pdv[2][7];        /* predefined delta values */
    uint8_t vector_fdv[2][8];        /* 8 bit delta value definition */
    uint8_t coeff_dccv[2][11];       /* DC coeff value */
    uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
    uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
    uint8_t coeff_dcct[2][36][5];    /* DC coeff coding type */
    uint8_t coeff_runv[2][14];       /* run value (vp6 only) */
    uint8_t mb_type[3][10][10];      /* model for decoding MB type */
    uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
120
} VP56Model;
121

122 123
struct vp56_context {
    AVCodecContext *avctx;
124
    H264ChromaContext h264chroma;
125
    HpelDSPContext hdsp;
126
    VideoDSPContext vdsp;
127
    VP3DSPContext vp3dsp;
128
    VP56DSPContext vp56dsp;
129
    uint8_t idct_scantable[64];
130
    AVFrame *frames[4];
131 132
    uint8_t *edge_emu_buffer_alloc;
    uint8_t *edge_emu_buffer;
133 134 135
    VP56RangeCoder c;
    VP56RangeCoder cc;
    VP56RangeCoder *ccp;
136
    int sub_version;
137 138

    /* frame info */
139
    int golden_frame;
140 141
    int plane_width[4];
    int plane_height[4];
142 143 144 145 146 147 148 149 150
    int mb_width;   /* number of horizontal MB */
    int mb_height;  /* number of vertical MB */
    int block_offset[6];

    int quantizer;
    uint16_t dequant_dc;
    uint16_t dequant_ac;

    /* DC predictors management */
151 152
    VP56RefDc *above_blocks;
    VP56RefDc left_block[4];
153
    int above_block_idx[6];
Diego Biurrun's avatar
Diego Biurrun committed
154
    int16_t prev_dc[3][3];    /* [plan][ref_frame] */
155 156

    /* blocks / macroblock */
157 158
    VP56mb mb_type;
    VP56Macroblock *macroblocks;
Diego Biurrun's avatar
Diego Biurrun committed
159
    DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
160 161

    /* motion vectors */
162 163
    VP56mv mv[6];  /* vectors for each block in MB */
    VP56mv vector_candidate[2];
164 165 166
    int vector_candidate_pos;

    /* filtering hints */
167
    int filter_header;               /* used in vp6 only */
168 169 170 171 172 173 174 175 176
    int deblock_filtering;
    int filter_selection;
    int filter_mode;
    int max_vector_length;
    int sample_variance_threshold;

    uint8_t coeff_ctx[4][64];              /* used in vp5 only */
    uint8_t coeff_ctx_last[4];             /* used in vp5 only */

177 178
    int has_alpha;

179 180 181 182
    /* upside-down flipping hints */
    int flip;  /* are we flipping ? */
    int frbi;  /* first row block index in MB */
    int srbi;  /* second row block index in MB */
183
    int stride[4];  /* stride for each plan */
184 185

    const uint8_t *vp56_coord_div;
186 187 188 189 190 191 192 193
    VP56ParseVectorAdjustment parse_vector_adjustment;
    VP56Filter filter;
    VP56ParseCoeff parse_coeff;
    VP56DefaultModelsInit default_models_init;
    VP56ParseVectorModels parse_vector_models;
    VP56ParseCoeffModels parse_coeff_models;
    VP56ParseHeader parse_header;

194 195 196
    /* for "slice" parallelism between YUV and A */
    VP56Context *alpha_context;

197
    VP56Model *modelp;
198
    VP56Model model;
199 200 201 202 203 204 205 206

    /* huffman decoding */
    int use_huffman;
    GetBitContext gb;
    VLC dccv_vlc[2];
    VLC runv_vlc[2];
    VLC ract_vlc[2][3][6];
    unsigned int nb_null[2][2];       /* number of consecutive NULL DC/AC */
207 208 209
};


210
int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
211
int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
212
                          int flip, int has_alpha);
213
int ff_vp56_free(AVCodecContext *avctx);
214
int ff_vp56_free_context(VP56Context *s);
215
void ff_vp56_init_dequant(VP56Context *s, int quantizer);
216
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
217
                         AVPacket *avpkt);
218 219 220 221 222 223


/**
 * vp56 specific range coder implementation
 */

224 225
extern const uint8_t ff_vp56_norm_shift[256];
void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
226

227
static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
228
{
229
    int shift = ff_vp56_norm_shift[c->high];
230
    int bits = c->bits;
231
    unsigned int code_word = c->code_word;
232 233 234 235 236

    c->high   <<= shift;
    code_word <<= shift;
    bits       += shift;
    if(bits >= 0 && c->buffer < c->end) {
237 238
        code_word |= bytestream_get_be16(&c->buffer) << bits;
        bits -= 16;
239 240
    }
    c->bits = bits;
241
    return code_word;
242 243
}

244 245 246
#if   ARCH_ARM
#include "arm/vp56_arith.h"
#elif ARCH_X86
247 248 249 250 251
#include "x86/vp56_arith.h"
#endif

#ifndef vp56_rac_get_prob
#define vp56_rac_get_prob vp56_rac_get_prob
252
static av_always_inline int vp56_rac_get_prob(VP56RangeCoder *c, uint8_t prob)
253
{
254
    unsigned int code_word = vp56_rac_renorm(c);
255
    unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
256
    unsigned int low_shift = low << 16;
257
    int bit = code_word >= low_shift;
258

259
    c->high = bit ? c->high - low : low;
260
    c->code_word = bit ? code_word - low_shift : code_word;
261 262 263

    return bit;
}
264
#endif
265

266
#ifndef vp56_rac_get_prob_branchy
267 268 269 270 271
// branchy variant, to be used where there's a branch based on the bit decoded
static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
{
    unsigned long code_word = vp56_rac_renorm(c);
    unsigned low = 1 + (((c->high - 1) * prob) >> 8);
272
    unsigned low_shift = low << 16;
273 274 275 276 277 278 279 280 281 282 283

    if (code_word >= low_shift) {
        c->high     -= low;
        c->code_word = code_word - low_shift;
        return 1;
    }

    c->high = low;
    c->code_word = code_word;
    return 0;
}
284
#endif
285

286
static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
287
{
288
    unsigned int code_word = vp56_rac_renorm(c);
289 290
    /* equiprobable */
    int low = (c->high + 1) >> 1;
291
    unsigned int low_shift = low << 16;
292
    int bit = code_word >= low_shift;
293
    if (bit) {
294 295
        c->high   -= low;
        code_word -= low_shift;
296
    } else {
297
        c->high = low;
298 299
    }

300
    c->code_word = code_word;
301 302 303
    return bit;
}

David Conrad's avatar
David Conrad committed
304
// rounding is different than vp56_rac_get, is vp56_rac_get wrong?
305
static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
David Conrad's avatar
David Conrad committed
306 307 308 309
{
    return vp56_rac_get_prob(c, 128);
}

310
static av_unused int vp56_rac_gets(VP56RangeCoder *c, int bits)
311 312 313 314 315 316 317 318 319 320
{
    int value = 0;

    while (bits--) {
        value = (value << 1) | vp56_rac_get(c);
    }

    return value;
}

321
static av_unused int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
David Conrad's avatar
David Conrad committed
322 323 324 325 326 327 328 329 330 331 332
{
    int value = 0;

    while (bits--) {
        value = (value << 1) | vp8_rac_get(c);
    }

    return value;
}

// fixme: add 1 bit to all the calls to this?
333
static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
David Conrad's avatar
David Conrad committed
334 335 336 337 338 339 340 341 342 343 344 345 346 347 348
{
    int v;

    if (!vp8_rac_get(c))
        return 0;

    v = vp8_rac_get_uint(c, bits);

    if (vp8_rac_get(c))
        v = -v;

    return v;
}

// P(7)
349
static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
350 351 352 353 354
{
    int v = vp56_rac_gets(c, 7) << 1;
    return v + !v;
}

355
static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
David Conrad's avatar
David Conrad committed
356 357 358 359 360
{
    int v = vp8_rac_get_uint(c, 7) << 1;
    return v + !v;
}

361 362 363 364
static av_always_inline
int vp56_rac_get_tree(VP56RangeCoder *c,
                      const VP56Tree *tree,
                      const uint8_t *probs)
365 366 367 368 369 370 371 372 373 374
{
    while (tree->val > 0) {
        if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
            tree += tree->val;
        else
            tree++;
    }
    return -tree->val;
}

375 376 377 378
// how probabilities are associated with decisions is different I think
// well, the new scheme fits in the old but this way has one fewer branches per decision
static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
                                   const uint8_t *probs)
David Conrad's avatar
David Conrad committed
379
{
380 381
    int i = 0;

David Conrad's avatar
David Conrad committed
382 383 384 385 386 387 388 389
    do {
        i = tree[i][vp56_rac_get_prob(c, probs[i])];
    } while (i > 0);

    return -i;
}

// DCTextra
390
static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
David Conrad's avatar
David Conrad committed
391 392 393 394 395 396 397 398 399 400
{
    int v = 0;

    do {
        v = (v<<1) + vp56_rac_get_prob(c, *prob++);
    } while (*prob);

    return v;
}

401
#endif /* AVCODEC_VP56_H */