Libav
vp56.h
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1 /*
2  * Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
26 #ifndef AVCODEC_VP56_H
27 #define AVCODEC_VP56_H
28 
29 #include "get_bits.h"
30 #include "hpeldsp.h"
31 #include "bytestream.h"
32 #include "h264chroma.h"
33 #include "videodsp.h"
34 #include "vp3dsp.h"
35 #include "vp56dsp.h"
36 
37 typedef struct vp56_context VP56Context;
38 
39 typedef enum {
45 } VP56Frame;
46 
47 typedef enum {
58 } VP56mb;
59 
60 typedef struct VP56Tree {
61  int8_t val;
62  int8_t prob_idx;
63 } VP56Tree;
64 
65 typedef struct VP56mv {
66  DECLARE_ALIGNED(4, int16_t, x);
67  int16_t y;
68 } VP56mv;
69 
70 #define VP56_SIZE_CHANGE 1
71 
72 typedef void (*VP56ParseVectorAdjustment)(VP56Context *s,
73  VP56mv *vect);
74 typedef void (*VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src,
75  int offset1, int offset2, int stride,
76  VP56mv mv, int mask, int select, int luma);
77 typedef void (*VP56ParseCoeff)(VP56Context *s);
78 typedef void (*VP56DefaultModelsInit)(VP56Context *s);
79 typedef void (*VP56ParseVectorModels)(VP56Context *s);
80 typedef int (*VP56ParseCoeffModels)(VP56Context *s);
81 typedef int (*VP56ParseHeader)(VP56Context *s, const uint8_t *buf,
82  int buf_size, int *golden_frame);
83 
84 typedef struct VP56RangeCoder {
85  int high;
86  int bits; /* stored negated (i.e. negative "bits" is a positive number of
87  bits left) in order to eliminate a negate in cache refilling */
88  const uint8_t *buffer;
89  const uint8_t *end;
90  unsigned int code_word;
92 
93 typedef struct VP56RefDc {
96  int16_t dc_coeff;
97 } VP56RefDc;
98 
99 typedef struct VP56Macroblock {
103 
104 typedef struct VP56Model {
105  uint8_t coeff_reorder[64]; /* used in vp6 only */
106  uint8_t coeff_index_to_pos[64]; /* used in vp6 only */
107  uint8_t vector_sig[2]; /* delta sign */
108  uint8_t vector_dct[2]; /* delta coding types */
109  uint8_t vector_pdi[2][2]; /* predefined delta init */
110  uint8_t vector_pdv[2][7]; /* predefined delta values */
111  uint8_t vector_fdv[2][8]; /* 8 bit delta value definition */
112  uint8_t coeff_dccv[2][11]; /* DC coeff value */
113  uint8_t coeff_ract[2][3][6][11]; /* Run/AC coding type and AC coeff value */
114  uint8_t coeff_acct[2][3][3][6][5];/* vp5 only AC coding type for coding group < 3 */
115  uint8_t coeff_dcct[2][36][5]; /* DC coeff coding type */
116  uint8_t coeff_runv[2][14]; /* run value (vp6 only) */
117  uint8_t mb_type[3][10][10]; /* model for decoding MB type */
118  uint8_t mb_types_stats[3][10][2];/* contextual, next MB type stats */
119 } VP56Model;
120 
121 struct vp56_context {
136 
137  /* frame info */
138  int plane_width[4];
139  int plane_height[4];
140  int mb_width; /* number of horizontal MB */
141  int mb_height; /* number of vertical MB */
142  int block_offset[6];
143 
145  uint16_t dequant_dc;
146  uint16_t dequant_ac;
147 
148  /* DC predictors management */
152  int16_t prev_dc[3][3]; /* [plan][ref_frame] */
153 
154  /* blocks / macroblock */
157  DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
158 
159  /* motion vectors */
160  VP56mv mv[6]; /* vectors for each block in MB */
163 
164  /* filtering hints */
165  int filter_header; /* used in vp6 only */
171 
172  uint8_t coeff_ctx[4][64]; /* used in vp5 only */
173  uint8_t coeff_ctx_last[4]; /* used in vp5 only */
174 
176 
177  /* upside-down flipping hints */
178  int flip; /* are we flipping ? */
179  int frbi; /* first row block index in MB */
180  int srbi; /* second row block index in MB */
181  int stride[4]; /* stride for each plan */
182 
191 
194 
195  /* huffman decoding */
200  VLC ract_vlc[2][3][6];
201  unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
202 };
203 
204 
205 int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
206 int ff_vp56_free(AVCodecContext *avctx);
207 void ff_vp56_init_dequant(VP56Context *s, int quantizer);
208 int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
209  AVPacket *avpkt);
210 
211 
216 extern const uint8_t ff_vp56_norm_shift[256];
217 void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
218 
220 {
221  int shift = ff_vp56_norm_shift[c->high];
222  int bits = c->bits;
223  unsigned int code_word = c->code_word;
224 
225  c->high <<= shift;
226  code_word <<= shift;
227  bits += shift;
228  if(bits >= 0 && c->buffer < c->end) {
229  code_word |= bytestream_get_be16(&c->buffer) << bits;
230  bits -= 16;
231  }
232  c->bits = bits;
233  return code_word;
234 }
235 
236 #if ARCH_ARM
237 #include "arm/vp56_arith.h"
238 #elif ARCH_X86
239 #include "x86/vp56_arith.h"
240 #endif
241 
242 #ifndef vp56_rac_get_prob
243 #define vp56_rac_get_prob vp56_rac_get_prob
245 {
246  unsigned int code_word = vp56_rac_renorm(c);
247  unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
248  unsigned int low_shift = low << 16;
249  int bit = code_word >= low_shift;
250 
251  c->high = bit ? c->high - low : low;
252  c->code_word = bit ? code_word - low_shift : code_word;
253 
254  return bit;
255 }
256 #endif
257 
258 #ifndef vp56_rac_get_prob_branchy
259 // branchy variant, to be used where there's a branch based on the bit decoded
261 {
262  unsigned long code_word = vp56_rac_renorm(c);
263  unsigned low = 1 + (((c->high - 1) * prob) >> 8);
264  unsigned low_shift = low << 16;
265 
266  if (code_word >= low_shift) {
267  c->high -= low;
268  c->code_word = code_word - low_shift;
269  return 1;
270  }
271 
272  c->high = low;
273  c->code_word = code_word;
274  return 0;
275 }
276 #endif
277 
279 {
280  unsigned int code_word = vp56_rac_renorm(c);
281  /* equiprobable */
282  int low = (c->high + 1) >> 1;
283  unsigned int low_shift = low << 16;
284  int bit = code_word >= low_shift;
285  if (bit) {
286  c->high -= low;
287  code_word -= low_shift;
288  } else {
289  c->high = low;
290  }
291 
292  c->code_word = code_word;
293  return bit;
294 }
295 
296 // rounding is different than vp56_rac_get, is vp56_rac_get wrong?
298 {
299  return vp56_rac_get_prob(c, 128);
300 }
301 
303 {
304  int value = 0;
305 
306  while (bits--) {
307  value = (value << 1) | vp56_rac_get(c);
308  }
309 
310  return value;
311 }
312 
314 {
315  int value = 0;
316 
317  while (bits--) {
318  value = (value << 1) | vp8_rac_get(c);
319  }
320 
321  return value;
322 }
323 
324 // fixme: add 1 bit to all the calls to this?
326 {
327  int v;
328 
329  if (!vp8_rac_get(c))
330  return 0;
331 
332  v = vp8_rac_get_uint(c, bits);
333 
334  if (vp8_rac_get(c))
335  v = -v;
336 
337  return v;
338 }
339 
340 // P(7)
342 {
343  int v = vp56_rac_gets(c, 7) << 1;
344  return v + !v;
345 }
346 
348 {
349  int v = vp8_rac_get_uint(c, 7) << 1;
350  return v + !v;
351 }
352 
353 static av_always_inline
355  const VP56Tree *tree,
356  const uint8_t *probs)
357 {
358  while (tree->val > 0) {
359  if (vp56_rac_get_prob(c, probs[tree->prob_idx]))
360  tree += tree->val;
361  else
362  tree++;
363  }
364  return -tree->val;
365 }
366 
372 static av_always_inline
373 int vp8_rac_get_tree_with_offset(VP56RangeCoder *c, const int8_t (*tree)[2],
374  const uint8_t *probs, int i)
375 {
376  do {
377  i = tree[i][vp56_rac_get_prob(c, probs[i])];
378  } while (i > 0);
379 
380  return -i;
381 }
382 
383 // how probabilities are associated with decisions is different I think
384 // well, the new scheme fits in the old but this way has one fewer branches per decision
385 static av_always_inline
386 int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
387  const uint8_t *probs)
388 {
389  return vp8_rac_get_tree_with_offset(c, tree, probs, 0);
390 }
391 
392 // DCTextra
394 {
395  int v = 0;
396 
397  do {
398  v = (v<<1) + vp56_rac_get_prob(c, *prob++);
399  } while (*prob);
400 
401  return v;
402 }
403 
404 #endif /* AVCODEC_VP56_H */
AVFrame * frames[4]
Definition: vp56.h:129
VP56mb mb_type
Definition: vp56.h:155
uint8_t coeff_ract[2][3][6][11]
Definition: vp56.h:113
unsigned int code_word
Definition: vp56.h:90
uint8_t coeff_index_to_pos[64]
Definition: vp56.h:106
This structure describes decoded (raw) audio or video data.
Definition: frame.h:135
int(* VP56ParseCoeffModels)(VP56Context *s)
Definition: vp56.h:80
static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t(*tree)[2], const uint8_t *probs)
Definition: vp56.h:386
int deblock_filtering
Definition: vp56.h:166
uint8_t coeff_dccv[2][11]
Definition: vp56.h:112
VP3DSPContext vp3dsp
Definition: vp56.h:126
uint8_t mb_types_stats[3][10][2]
Definition: vp56.h:118
uint8_t vector_sig[2]
Definition: vp56.h:107
int vector_candidate_pos
Definition: vp56.h:162
Inter MB, no vector, from previous frame.
Definition: vp56.h:48
uint8_t vector_fdv[2][8]
Definition: vp56.h:111
VP56ParseVectorAdjustment parse_vector_adjustment
Definition: vp56.h:184
int use_huffman
Definition: vp56.h:196
#define DECLARE_ALIGNED(n, t, v)
Definition: mem.h:58
uint16_t dequant_ac
Definition: vp56.h:146
VP56ParseCoeffModels parse_coeff_models
Definition: vp56.h:189
int stride
Definition: mace.c:144
VP56ParseVectorModels parse_vector_models
Definition: vp56.h:188
int stride[4]
Definition: vp56.h:181
int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
Definition: vp56.c:653
int16_t y
Definition: vp56.h:67
int mb_height
Definition: vp56.h:141
void(* VP56ParseVectorModels)(VP56Context *s)
Definition: vp56.h:79
uint8_t bits
Definition: crc.c:251
uint8_t
uint16_t dequant_dc
Definition: vp56.h:145
int mb_width
Definition: vp56.h:140
unsigned int nb_null[2][2]
Definition: vp56.h:201
void(* VP56ParseCoeff)(VP56Context *s)
Definition: vp56.h:77
VP56DSPContext vp56dsp
Definition: vp56.h:127
const char data[16]
Definition: mxf.c:70
void ff_vp56_init_dequant(VP56Context *s, int quantizer)
Definition: vp56.c:34
bitstream reader API header.
uint8_t * edge_emu_buffer
Definition: vp56.h:131
static av_always_inline int vp56_rac_get_tree(VP56RangeCoder *c, const VP56Tree *tree, const uint8_t *probs)
Definition: vp56.h:354
uint8_t coeff_reorder[64]
Definition: vp56.h:105
Inter MB, second vector, from golden frame.
Definition: vp56.h:57
VP56ParseCoeff parse_coeff
Definition: vp56.h:186
void(* VP56Filter)(VP56Context *s, uint8_t *dst, uint8_t *src, int offset1, int offset2, int stride, VP56mv mv, int mask, int select, int luma)
Definition: vp56.h:74
static const uint16_t mask[17]
Definition: lzw.c:38
static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
Definition: vp56.h:278
VLC runv_vlc[2]
Definition: vp56.h:199
VP56mb
Definition: vp56.h:47
Definition: vp56.h:93
uint8_t type
Definition: vp56.h:100
VLC dccv_vlc[2]
Definition: vp56.h:198
Inter MB, first vector, from previous frame.
Definition: vp56.h:51
int frbi
Definition: vp56.h:179
VP56mv mv[6]
Definition: vp56.h:160
VP56Model models[2]
Definition: vp56.h:193
Definition: get_bits.h:64
const uint8_t * end
Definition: vp56.h:89
Intra MB.
Definition: vp56.h:49
VP56RangeCoder cc
Definition: vp56.h:133
VP56Frame
Definition: vp56.h:39
VP56RangeCoder * ccp
Definition: vp56.h:134
static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
Definition: vp56.h:341
int block_offset[6]
Definition: vp56.h:142
Definition: vp56.h:60
Inter MB, first vector, from golden frame.
Definition: vp56.h:56
Half-pel DSP context.
Definition: hpeldsp.h:45
int8_t prob_idx
Definition: vp56.h:62
VP56RangeCoder c
Definition: vp56.h:132
uint8_t vector_pdi[2][2]
Definition: vp56.h:109
static av_unused int vp8_rac_get_sint(VP56RangeCoder *c, int bits)
Definition: vp56.h:325
uint8_t idct_scantable[64]
Definition: vp56.h:128
VP56ParseHeader parse_header
Definition: vp56.h:190
static av_unused int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
Definition: vp56.h:313
VLC ract_vlc[2][3][6]
Definition: vp56.h:200
int filter_selection
Definition: vp56.h:167
#define vp56_rac_get_prob
Definition: vp56.h:243
int plane_height[4]
Definition: vp56.h:139
VP56Macroblock * macroblocks
Definition: vp56.h:156
VP56RefDc * above_blocks
Definition: vp56.h:149
uint8_t coeff_ctx[4][64]
Definition: vp56.h:172
VP56Frame ref_frame
Definition: vp56.h:95
uint8_t coeff_runv[2][14]
Definition: vp56.h:116
static const int8_t mv[256][2]
Definition: 4xm.c:75
static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
Definition: vp56.h:260
Inter MB, 4 vectors, from previous frame.
Definition: vp56.h:55
int plane_width[4]
Definition: vp56.h:138
int quantizer
Definition: vp56.h:144
Half-pel DSP functions.
Inter MB, no vector, from golden frame.
Definition: vp56.h:53
Inter MB, second vector, from previous frame.
Definition: vp56.h:52
main external API structure.
Definition: avcodec.h:1050
static void(WINAPI *cond_broadcast)(pthread_cond_t *cond)
static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
Definition: vp56.h:219
int ff_vp56_free(AVCodecContext *avctx)
Definition: vp56.c:702
uint8_t mb_type[3][10][10]
Definition: vp56.h:117
uint8_t not_null_dc
Definition: vp56.h:94
int sub_version
Definition: vp56.h:135
int bits
Definition: vp56.h:86
VP56DefaultModelsInit default_models_init
Definition: vp56.h:187
uint8_t coeff_dcct[2][36][5]
Definition: vp56.h:115
int8_t val
Definition: vp56.h:61
Inter MB, above/left vector + delta, from previous frame.
Definition: vp56.h:50
static av_always_inline int vp8_rac_get_coeff(VP56RangeCoder *c, const uint8_t *prob)
Definition: vp56.h:393
int sample_variance_threshold
Definition: vp56.h:170
VideoDSPContext vdsp
Definition: vp56.h:125
const uint8_t ff_vp56_norm_shift[256]
vp56 specific range coder implementation
Definition: vp56rac.c:25
void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size)
Definition: vp56rac.c:40
uint8_t coeff_acct[2][3][3][6][5]
Definition: vp56.h:114
Definition: vp56.h:65
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: vp56.c:492
uint8_t coeff_ctx_last[4]
Definition: vp56.h:173
int srbi
Definition: vp56.h:180
const uint8_t * vp56_coord_div
Definition: vp56.h:183
static av_always_inline int vp8_rac_get_tree_with_offset(VP56RangeCoder *c, const int8_t(*tree)[2], const uint8_t *probs, int i)
This is identical to vp8_rac_get_tree except for the possibility of starting on a node other than the...
Definition: vp56.h:373
int max_vector_length
Definition: vp56.h:169
VP56mv mv
Definition: vp56.h:101
int filter_mode
Definition: vp56.h:168
int16_t x
Definition: vp56.h:66
static void flip(AVCodecContext *avctx, AVPicture *picture)
Definition: rawdec.c:132
void(* VP56ParseVectorAdjustment)(VP56Context *s, VP56mv *vect)
Definition: vp56.h:72
void(* VP56DefaultModelsInit)(VP56Context *s)
Definition: vp56.h:78
static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
Definition: vp56.h:297
VP56Filter filter
Definition: vp56.h:185
Core video DSP helper functions.
int filter_header
Definition: vp56.h:165
int16_t dc_coeff
Definition: vp56.h:96
static av_unused int vp56_rac_gets(VP56RangeCoder *c, int bits)
Definition: vp56.h:302
HpelDSPContext hdsp
Definition: vp56.h:124
Inter MB, above/left vector + delta, from golden frame.
Definition: vp56.h:54
VP56Model * modelp
Definition: vp56.h:192
int has_alpha
Definition: vp56.h:175
int above_block_idx[6]
Definition: vp56.h:151
int flip
Definition: vp56.h:178
uint8_t vector_pdv[2][7]
Definition: vp56.h:110
uint8_t * edge_emu_buffer_alloc
Definition: vp56.h:130
static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
Definition: vp56.h:347
const uint8_t * buffer
Definition: vp56.h:88
#define av_always_inline
Definition: attributes.h:40
AVCodecContext * avctx
Definition: vp56.h:122
int high
Definition: vp56.h:85
VP56RefDc left_block[4]
Definition: vp56.h:150
int(* VP56ParseHeader)(VP56Context *s, const uint8_t *buf, int buf_size, int *golden_frame)
Definition: vp56.h:81
int16_t prev_dc[3][3]
Definition: vp56.h:152
This structure stores compressed data.
Definition: avcodec.h:950
VP56mv vector_candidate[2]
Definition: vp56.h:161
uint8_t vector_dct[2]
Definition: vp56.h:108
#define av_unused
Definition: attributes.h:86
H264ChromaContext h264chroma
Definition: vp56.h:123
GetBitContext gb
Definition: vp56.h:197
int16_t block_coeff[6][64]
Definition: vp56.h:157