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vp56.h
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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 "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 {
48  VP56_MB_INTER_NOVEC_PF = 0, /**< Inter MB, no vector, from previous frame */
49  VP56_MB_INTRA = 1, /**< Intra MB */
50  VP56_MB_INTER_DELTA_PF = 2, /**< Inter MB, above/left vector + delta, from previous frame */
51  VP56_MB_INTER_V1_PF = 3, /**< Inter MB, first vector, from previous frame */
52  VP56_MB_INTER_V2_PF = 4, /**< Inter MB, second vector, from previous frame */
53  VP56_MB_INTER_NOVEC_GF = 5, /**< Inter MB, no vector, from golden frame */
54  VP56_MB_INTER_DELTA_GF = 6, /**< Inter MB, above/left vector + delta, from golden frame */
55  VP56_MB_INTER_4V = 7, /**< Inter MB, 4 vectors, from previous frame */
56  VP56_MB_INTER_V1_GF = 8, /**< Inter MB, first vector, from golden frame */
57  VP56_MB_INTER_V2_GF = 9, /**< Inter MB, second vector, from golden frame */
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);
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 */
139  int plane_width[4];
140  int plane_height[4];
141  int mb_width; /* number of horizontal MB */
142  int mb_height; /* number of vertical MB */
143  int block_offset[6];
144 
146  uint16_t dequant_dc;
147  uint16_t dequant_ac;
148 
149  /* DC predictors management */
153  int16_t prev_dc[3][3]; /* [plan][ref_frame] */
154 
155  /* blocks / macroblock */
158  DECLARE_ALIGNED(16, int16_t, block_coeff)[6][64];
159 
160  /* motion vectors */
161  VP56mv mv[6]; /* vectors for each block in MB */
164 
165  /* filtering hints */
166  int filter_header; /* used in vp6 only */
172 
173  uint8_t coeff_ctx[4][64]; /* used in vp5 only */
174  uint8_t coeff_ctx_last[4]; /* used in vp5 only */
175 
177 
178  /* upside-down flipping hints */
179  int flip; /* are we flipping ? */
180  int frbi; /* first row block index in MB */
181  int srbi; /* second row block index in MB */
182  int stride[4]; /* stride for each plan */
183 
192 
193  /* for "slice" parallelism between YUV and A */
194  VP56Context *alpha_context;
195 
198 
199  /* huffman decoding */
204  VLC ract_vlc[2][3][6];
205  unsigned int nb_null[2][2]; /* number of consecutive NULL DC/AC */
206 };
207 
208 
209 int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha);
210 int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s,
211  int flip, int has_alpha);
212 int ff_vp56_free(AVCodecContext *avctx);
213 int ff_vp56_free_context(VP56Context *s);
214 void ff_vp56_init_dequant(VP56Context *s, int quantizer);
215 int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
216  AVPacket *avpkt);
217 
218 
219 /**
220  * vp56 specific range coder implementation
221  */
222 
223 extern const uint8_t ff_vp56_norm_shift[256];
224 void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size);
225 
227 {
228  int shift = ff_vp56_norm_shift[c->high];
229  int bits = c->bits;
230  unsigned int code_word = c->code_word;
231 
232  c->high <<= shift;
233  code_word <<= shift;
234  bits += shift;
235  if(bits >= 0 && c->buffer < c->end) {
236  code_word |= bytestream_get_be16(&c->buffer) << bits;
237  bits -= 16;
238  }
239  c->bits = bits;
240  return code_word;
241 }
242 
243 #if ARCH_ARM
244 #include "arm/vp56_arith.h"
245 #elif ARCH_X86
246 #include "x86/vp56_arith.h"
247 #endif
248 
249 #ifndef vp56_rac_get_prob
250 #define vp56_rac_get_prob vp56_rac_get_prob
252 {
253  unsigned int code_word = vp56_rac_renorm(c);
254  unsigned int low = 1 + (((c->high - 1) * prob) >> 8);
255  unsigned int low_shift = low << 16;
256  int bit = code_word >= low_shift;
257 
258  c->high = bit ? c->high - low : low;
259  c->code_word = bit ? code_word - low_shift : code_word;
260 
261  return bit;
262 }
263 #endif
264 
265 #ifndef vp56_rac_get_prob_branchy
266 // branchy variant, to be used where there's a branch based on the bit decoded
268 {
269  unsigned long code_word = vp56_rac_renorm(c);
270  unsigned low = 1 + (((c->high - 1) * prob) >> 8);
271  unsigned low_shift = low << 16;
272 
273  if (code_word >= low_shift) {
274  c->high -= low;
275  c->code_word = code_word - low_shift;
276  return 1;
277  }
278 
279  c->high = low;
280  c->code_word = code_word;
281  return 0;
282 }
283 #endif
284 
286 {
287  unsigned int code_word = vp56_rac_renorm(c);
288  /* equiprobable */
289  int low = (c->high + 1) >> 1;
290  unsigned int low_shift = low << 16;
291  int bit = code_word >= low_shift;
292  if (bit) {
293  c->high -= low;
294  code_word -= low_shift;
295  } else {
296  c->high = low;
297  }
298 
299  c->code_word = code_word;
300  return bit;
301 }
302 
303 // rounding is different than vp56_rac_get, is vp56_rac_get wrong?
305 {
306  return vp56_rac_get_prob(c, 128);
307 }
308 
310 {
311  int value = 0;
312 
313  while (bits--) {
314  value = (value << 1) | vp56_rac_get(c);
315  }
316 
317  return value;
318 }
319 
321 {
322  int value = 0;
323 
324  while (bits--) {
325  value = (value << 1) | vp8_rac_get(c);
326  }
327 
328  return value;
329 }
330 
331 // fixme: add 1 bit to all the calls to this?
333 {
334  int v;
335 
336  if (!vp8_rac_get(c))
337  return 0;
338 
339  v = vp8_rac_get_uint(c, bits);
340 
341  if (vp8_rac_get(c))
342  v = -v;
343 
344  return v;
345 }
346 
347 // P(7)
349 {
350  int v = vp56_rac_gets(c, 7) << 1;
351  return v + !v;
352 }
353 
355 {
356  int v = vp8_rac_get_uint(c, 7) << 1;
357  return v + !v;
358 }
359 
360 static av_always_inline
362  const VP56Tree *tree,
363  const uint8_t *probs)
364 {
365  while (tree->val > 0) {
366  if (vp56_rac_get_prob_branchy(c, probs[tree->prob_idx]))
367  tree += tree->val;
368  else
369  tree++;
370  }
371  return -tree->val;
372 }
373 
374 // how probabilities are associated with decisions is different I think
375 // well, the new scheme fits in the old but this way has one fewer branches per decision
376 static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t (*tree)[2],
377  const uint8_t *probs)
378 {
379  int i = 0;
380 
381  do {
382  i = tree[i][vp56_rac_get_prob(c, probs[i])];
383  } while (i > 0);
384 
385  return -i;
386 }
387 
388 // DCTextra
390 {
391  int v = 0;
392 
393  do {
394  v = (v<<1) + vp56_rac_get_prob(c, *prob++);
395  } while (*prob);
396 
397  return v;
398 }
399 
400 #endif /* AVCODEC_VP56_H */
AVFrame * frames[4]
Definition: vp56.h:129
VP56mb mb_type
Definition: vp56.h:156
uint8_t coeff_ract[2][3][6][11]
Definition: vp56.h:113
const char * s
Definition: avisynth_c.h:768
static int shift(int a, int b)
Definition: sonic.c:82
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:184
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
static av_always_inline int vp8_rac_get_tree(VP56RangeCoder *c, const int8_t(*tree)[2], const uint8_t *probs)
Definition: vp56.h:376
int deblock_filtering
Definition: vp56.h:167
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:163
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:185
int use_huffman
Definition: vp56.h:200
void(* VP56DefaultModelsInit)(VP56Context *s)
Definition: vp56.h:78
uint16_t dequant_ac
Definition: vp56.h:147
#define src
Definition: vp8dsp.c:254
VP56ParseCoeffModels parse_coeff_models
Definition: vp56.h:190
VP56ParseVectorModels parse_vector_models
Definition: vp56.h:189
int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
Definition: vp56.c:683
int16_t y
Definition: vp56.h:67
int mb_height
Definition: vp56.h:142
uint8_t bits
Definition: crc.c:296
uint8_t
uint16_t dequant_dc
Definition: vp56.h:146
int mb_width
Definition: vp56.h:141
unsigned int nb_null[2][2]
Definition: vp56.h:205
VP56DSPContext vp56dsp
Definition: vp56.h:127
#define DECLARE_ALIGNED(n, t, v)
Declare a variable that is aligned in memory.
Definition: mem.h:101
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:361
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:187
static const uint16_t mask[17]
Definition: lzw.c:38
static void flip(AVCodecContext *avctx, AVFrame *frame)
Definition: rawdec.c:134
static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
Definition: vp56.h:285
VLC runv_vlc[2]
Definition: vp56.h:203
VP56mb
Definition: vp56.h:47
Definition: vp56.h:93
uint8_t type
Definition: vp56.h:100
VLC dccv_vlc[2]
Definition: vp56.h:202
Inter MB, first vector, from previous frame.
Definition: vp56.h:51
int frbi
Definition: vp56.h:180
VP56mv mv[6]
Definition: vp56.h:161
Definition: vlc.h:26
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:348
int block_offset[6]
Definition: vp56.h:143
Definition: vp56.h:60
VP56Context * alpha_context
Definition: vp56.h:194
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:332
typedef void(APIENTRY *FF_PFNGLACTIVETEXTUREPROC)(GLenum texture)
GLsizei GLboolean const GLfloat * value
Definition: opengl_enc.c:109
int(* VP56ParseCoeffModels)(VP56Context *s)
Definition: vp56.h:80
uint8_t idct_scantable[64]
Definition: vp56.h:128
VP56ParseHeader parse_header
Definition: vp56.h:191
VLC ract_vlc[2][3][6]
Definition: vp56.h:204
int filter_selection
Definition: vp56.h:168
#define vp56_rac_get_prob
Definition: vp56.h:250
int plane_height[4]
Definition: vp56.h:140
VP56Macroblock * macroblocks
Definition: vp56.h:157
VP56RefDc * above_blocks
Definition: vp56.h:150
uint8_t coeff_ctx[4][64]
Definition: vp56.h:173
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:77
static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
Definition: vp56.h:267
Inter MB, 4 vectors, from previous frame.
Definition: vp56.h:55
int plane_width[4]
Definition: vp56.h:139
int quantizer
Definition: vp56.h:145
Half-pel DSP functions.
Inter MB, no vector, from golden frame.
Definition: vp56.h:53
int ff_vp56_init_context(AVCodecContext *avctx, VP56Context *s, int flip, int has_alpha)
Definition: vp56.c:689
Inter MB, second vector, from previous frame.
Definition: vp56.h:52
main external API structure.
Definition: avcodec.h:1676
static av_always_inline unsigned int vp56_rac_renorm(VP56RangeCoder *c)
Definition: vp56.h:226
int ff_vp56_free(AVCodecContext *avctx)
Definition: vp56.c:743
void(* VP56ParseVectorAdjustment)(VP56Context *s, VP56mv *vect)
Definition: vp56.h:72
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
void * buf
Definition: avisynth_c.h:690
int bits
Definition: vp56.h:86
VP56DefaultModelsInit default_models_init
Definition: vp56.h:188
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:389
void(* VP56ParseCoeff)(VP56Context *s)
Definition: vp56.h:77
int sample_variance_threshold
Definition: vp56.h:171
int ff_vp56_free_context(VP56Context *s)
Definition: vp56.c:749
VideoDSPContext vdsp
Definition: vp56.h:125
const uint8_t ff_vp56_norm_shift[256]
vp56 specific range coder implementation
Definition: vp56rac.c:25
static int vp8_rac_get_uint(VP56RangeCoder *c, int bits)
Definition: vp56.h:320
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:499
uint8_t coeff_ctx_last[4]
Definition: vp56.h:174
int srbi
Definition: vp56.h:181
const uint8_t * vp56_coord_div
Definition: vp56.h:184
int max_vector_length
Definition: vp56.h:170
GLint GLenum GLboolean GLsizei stride
Definition: opengl_enc.c:105
int
VP56mv mv
Definition: vp56.h:101
int filter_mode
Definition: vp56.h:169
int16_t x
Definition: vp56.h:66
int(* VP56ParseHeader)(VP56Context *s, const uint8_t *buf, int buf_size)
Definition: vp56.h:81
int golden_frame
Definition: vp56.h:138
static av_always_inline int vp8_rac_get(VP56RangeCoder *c)
Definition: vp56.h:304
VP56Filter filter
Definition: vp56.h:186
Core video DSP helper functions.
int filter_header
Definition: vp56.h:166
int16_t dc_coeff
Definition: vp56.h:96
HpelDSPContext hdsp
Definition: vp56.h:124
Inter MB, above/left vector + delta, from golden frame.
Definition: vp56.h:54
VP56Model * modelp
Definition: vp56.h:196
int has_alpha
Definition: vp56.h:176
int above_block_idx[6]
Definition: vp56.h:152
int flip
Definition: vp56.h:179
VP56Model model
Definition: vp56.h:197
static AVCodec * c
uint8_t vector_pdv[2][7]
Definition: vp56.h:110
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
uint8_t * edge_emu_buffer_alloc
Definition: vp56.h:130
static av_unused int vp8_rac_get_nn(VP56RangeCoder *c)
Definition: vp56.h:354
const uint8_t * buffer
Definition: vp56.h:88
#define av_always_inline
Definition: attributes.h:39
AVCodecContext * avctx
Definition: vp56.h:122
int high
Definition: vp56.h:85
VP56RefDc left_block[4]
Definition: vp56.h:151
#define stride
int16_t prev_dc[3][3]
Definition: vp56.h:153
This structure stores compressed data.
Definition: avcodec.h:1578
VP56mv vector_candidate[2]
Definition: vp56.h:162
void(* VP56ParseVectorModels)(VP56Context *s)
Definition: vp56.h:79
uint8_t vector_dct[2]
Definition: vp56.h:108
#define av_unused
Definition: attributes.h:126
H264ChromaContext h264chroma
Definition: vp56.h:123
static int vp56_rac_gets(VP56RangeCoder *c, int bits)
Definition: vp56.h:309
GetBitContext gb
Definition: vp56.h:201
int16_t block_coeff[6][64]
Definition: vp56.h:158