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vp5.c
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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 compatible video decoder
24  */
25 
26 #include <stdlib.h>
27 #include <string.h>
28 
29 #include "avcodec.h"
30 #include "get_bits.h"
31 #include "internal.h"
32 
33 #include "vp56.h"
34 #include "vp56data.h"
35 #include "vp5data.h"
36 
37 
38 static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
39 {
40  VP56RangeCoder *c = &s->c;
41  int rows, cols;
42  int ret;
43 
44  ret = ff_vp56_init_range_decoder(&s->c, buf, buf_size);
45  if (ret < 0)
46  return ret;
47  s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
48  vp56_rac_get(c);
50  if (s->frames[VP56_FRAME_CURRENT]->key_frame)
51  {
52  vp56_rac_gets(c, 8);
53  if(vp56_rac_gets(c, 5) > 5)
54  return AVERROR_INVALIDDATA;
55  vp56_rac_gets(c, 2);
56  if (vp56_rac_get(c)) {
57  av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
58  return AVERROR_PATCHWELCOME;
59  }
60  rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
61  cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
62  if (!rows || !cols) {
63  av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n",
64  cols << 4, rows << 4);
65  return AVERROR_INVALIDDATA;
66  }
67  vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
68  vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
69  vp56_rac_gets(c, 2);
70  if (!s->macroblocks || /* first frame */
71  16*cols != s->avctx->coded_width ||
72  16*rows != s->avctx->coded_height) {
73  int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
74  if (ret < 0)
75  return ret;
76  return VP56_SIZE_CHANGE;
77  }
78  } else if (!s->macroblocks)
79  return AVERROR_INVALIDDATA;
80  return 0;
81 }
82 
83 static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
84 {
85  VP56RangeCoder *c = &s->c;
86  VP56Model *model = s->modelp;
87  int comp, di;
88 
89  for (comp=0; comp<2; comp++) {
90  int delta = 0;
91  if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) {
92  int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
93  di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
94  di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
96  model->vector_pdv[comp]);
97  delta = di | (delta << 2);
98  delta = (delta ^ -sign) + sign;
99  }
100  if (!comp)
101  vect->x = delta;
102  else
103  vect->y = delta;
104  }
105 }
106 
107 static void vp5_parse_vector_models(VP56Context *s)
108 {
109  VP56RangeCoder *c = &s->c;
110  VP56Model *model = s->modelp;
111  int comp, node;
112 
113  for (comp=0; comp<2; comp++) {
114  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][0]))
115  model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
116  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][1]))
117  model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
118  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][2]))
119  model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
120  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][3]))
121  model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
122  }
123 
124  for (comp=0; comp<2; comp++)
125  for (node=0; node<7; node++)
126  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][4 + node]))
127  model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
128 }
129 
130 static int vp5_parse_coeff_models(VP56Context *s)
131 {
132  VP56RangeCoder *c = &s->c;
133  VP56Model *model = s->modelp;
134  uint8_t def_prob[11];
135  int node, cg, ctx;
136  int ct; /* code type */
137  int pt; /* plane type (0 for Y, 1 for U or V) */
138 
139  memset(def_prob, 0x80, sizeof(def_prob));
140 
141  for (pt=0; pt<2; pt++)
142  for (node=0; node<11; node++)
143  if (vp56_rac_get_prob_branchy(c, vp5_dccv_pct[pt][node])) {
144  def_prob[node] = vp56_rac_gets_nn(c, 7);
145  model->coeff_dccv[pt][node] = def_prob[node];
146  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
147  model->coeff_dccv[pt][node] = def_prob[node];
148  }
149 
150  for (ct=0; ct<3; ct++)
151  for (pt=0; pt<2; pt++)
152  for (cg=0; cg<6; cg++)
153  for (node=0; node<11; node++)
154  if (vp56_rac_get_prob_branchy(c, vp5_ract_pct[ct][pt][cg][node])) {
155  def_prob[node] = vp56_rac_gets_nn(c, 7);
156  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
157  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
158  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
159  }
160 
161  /* coeff_dcct is a linear combination of coeff_dccv */
162  for (pt=0; pt<2; pt++)
163  for (ctx=0; ctx<36; ctx++)
164  for (node=0; node<5; node++)
165  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);
166 
167  /* coeff_acct is a linear combination of coeff_ract */
168  for (ct=0; ct<3; ct++)
169  for (pt=0; pt<2; pt++)
170  for (cg=0; cg<3; cg++)
171  for (ctx=0; ctx<6; ctx++)
172  for (node=0; node<5; node++)
173  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);
174  return 0;
175 }
176 
177 static int vp5_parse_coeff(VP56Context *s)
178 {
179  VP56RangeCoder *c = &s->c;
180  VP56Model *model = s->modelp;
181  uint8_t *permute = s->idct_scantable;
182  uint8_t *model1, *model2;
183  int coeff, sign, coeff_idx;
184  int b, i, cg, idx, ctx, ctx_last;
185  int pt = 0; /* plane type (0 for Y, 1 for U or V) */
186 
187  if (c->end <= c->buffer && c->bits >= 0) {
188  av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp5_parse_coeff\n");
189  return AVERROR_INVALIDDATA;
190  }
191 
192  for (b=0; b<6; b++) {
193  int ct = 1; /* code type */
194 
195  if (b > 3) pt = 1;
196 
197  ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0]
198  + s->above_blocks[s->above_block_idx[b]].not_null_dc;
199  model1 = model->coeff_dccv[pt];
200  model2 = model->coeff_dcct[pt][ctx];
201 
202  coeff_idx = 0;
203  for (;;) {
204  if (vp56_rac_get_prob_branchy(c, model2[0])) {
205  if (vp56_rac_get_prob_branchy(c, model2[2])) {
206  if (vp56_rac_get_prob_branchy(c, model2[3])) {
207  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4;
208  idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
209  sign = vp56_rac_get(c);
210  coeff = ff_vp56_coeff_bias[idx+5];
211  for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
212  coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
213  } else {
214  if (vp56_rac_get_prob_branchy(c, model2[4])) {
215  coeff = 3 + vp56_rac_get_prob(c, model1[5]);
216  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3;
217  } else {
218  coeff = 2;
219  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2;
220  }
221  sign = vp56_rac_get(c);
222  }
223  ct = 2;
224  } else {
225  ct = 1;
226  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1;
227  sign = vp56_rac_get(c);
228  coeff = 1;
229  }
230  coeff = (coeff ^ -sign) + sign;
231  if (coeff_idx)
232  coeff *= s->dequant_ac;
233  s->block_coeff[b][permute[coeff_idx]] = coeff;
234  } else {
235  if (ct && !vp56_rac_get_prob_branchy(c, model2[1]))
236  break;
237  ct = 0;
238  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0;
239  }
240  coeff_idx++;
241  if (coeff_idx >= 64)
242  break;
243 
244  cg = vp5_coeff_groups[coeff_idx];
245  ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx];
246  model1 = model->coeff_ract[pt][ct][cg];
247  model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
248  }
249 
250  ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24);
251  s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx;
252  if (coeff_idx < ctx_last)
253  for (i=coeff_idx; i<=ctx_last; i++)
254  s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5;
255  s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0];
256  }
257  return 0;
258 }
259 
260 static void vp5_default_models_init(VP56Context *s)
261 {
262  VP56Model *model = s->modelp;
263  int i;
264 
265  for (i=0; i<2; i++) {
266  model->vector_sig[i] = 0x80;
267  model->vector_dct[i] = 0x80;
268  model->vector_pdi[i][0] = 0x55;
269  model->vector_pdi[i][1] = 0x80;
270  }
271  memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
272  memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
273 }
274 
276 {
277  VP56Context *s = avctx->priv_data;
278  int ret;
279 
280  if ((ret = ff_vp56_init(avctx, 1, 0)) < 0)
281  return ret;
282  s->vp56_coord_div = vp5_coord_div;
283  s->parse_vector_adjustment = vp5_parse_vector_adjustment;
284  s->parse_coeff = vp5_parse_coeff;
285  s->default_models_init = vp5_default_models_init;
286  s->parse_vector_models = vp5_parse_vector_models;
287  s->parse_coeff_models = vp5_parse_coeff_models;
288  s->parse_header = vp5_parse_header;
289 
290  return 0;
291 }
292 
294  .name = "vp5",
295  .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),
296  .type = AVMEDIA_TYPE_VIDEO,
297  .id = AV_CODEC_ID_VP5,
298  .priv_data_size = sizeof(VP56Context),
300  .close = ff_vp56_free,
302  .capabilities = AV_CODEC_CAP_DR1,
303 };
av_cold int ff_vp56_free(AVCodecContext *avctx)
Definition: vp56.c:812
uint8_t coeff_ract[2][3][6][11]
Definition: vp56.h:113
const char * s
Definition: avisynth_c.h:631
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
VP5 and VP6 compatible video decoder (common features)
static av_cold int vp5_decode_init(AVCodecContext *avctx)
Definition: vp5.c:275
int ff_set_dimensions(AVCodecContext *s, int width, int height)
Check that the provided frame dimensions are valid and set them on the codec context.
Definition: utils.c:216
const uint8_t ff_vp56_coeff_bias[]
Definition: vp56data.c:67
uint8_t coeff_dccv[2][11]
Definition: vp56.h:112
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
uint8_t mb_types_stats[3][10][2]
Definition: vp56.h:118
static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
Definition: vp5.c:38
uint8_t vector_sig[2]
Definition: vp56.h:107
const char * b
Definition: vf_curves.c:109
static const uint8_t vp5_coord_div[]
Definition: vp5data.h:175
static int vp5_parse_coeff_models(VP56Context *s)
Definition: vp5.c:130
#define VP56_SIZE_CHANGE
Definition: vp56.h:70
VP5 compatible video decoder.
static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
Definition: vp5.c:83
av_cold int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
Definition: vp56.c:752
AVCodec.
Definition: avcodec.h:3482
static const uint8_t vp5_ract_pct[3][2][6][11]
Definition: vp5data.h:52
int16_t y
Definition: vp56.h:67
uint8_t
#define av_cold
Definition: attributes.h:74
float delta
static int vp5_parse_coeff(VP56Context *s)
Definition: vp5.c:177
int pt
Definition: rtp.c:35
static void permute(int16_t dst[64], const int16_t src[64], enum idct_permutation_type perm_type)
Definition: dct-test.c:143
bitstream reader API header.
static av_always_inline int vp56_rac_get_tree(VP56RangeCoder *c, const VP56Tree *tree, const uint8_t *probs)
Definition: vp56.h:364
#define av_log(a,...)
static const uint8_t vp5_dccv_pct[2][11]
Definition: vp5data.h:47
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
static void vp5_parse_vector_models(VP56Context *s)
Definition: vp5.c:107
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:178
static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
Definition: vp56.h:288
const char * name
Name of the codec implementation.
Definition: avcodec.h:3489
void ff_vp56_init_dequant(VP56Context *s, int quantizer)
Definition: vp56.c:34
const uint8_t ff_vp56_b6to4[]
Definition: vp56data.c:29
Libavcodec external API header.
const uint8_t * end
Definition: vp56.h:89
AVCodec ff_vp5_decoder
Definition: vp5.c:293
int ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size)
Definition: vp56rac.c:40
VP5 and VP6 compatible video decoder (common data)
static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
Definition: vp56.h:351
#define FFMIN(a, b)
Definition: common.h:92
uint8_t vector_pdi[2][2]
Definition: vp56.h:109
static const int16_t vp5_ract_lc[3][3][5][6][2]
Definition: vp5data.h:124
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: vp56.c:544
const uint8_t ff_vp56_coeff_bit_length[]
Definition: vp56data.c:68
#define vp56_rac_get_prob
Definition: vp56.h:253
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
static const int16_t vp5_dccv_lc[5][36][2]
Definition: vp5data.h:91
static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
Definition: vp56.h:270
const VP56Tree ff_vp56_pc_tree[]
Definition: vp56data.c:59
main external API structure.
Definition: avcodec.h:1512
void * buf
Definition: avisynth_c.h:553
const uint8_t ff_vp56_coeff_parse_table[6][11]
Definition: vp56data.c:31
int bits
Definition: vp56.h:86
uint8_t coeff_dcct[2][36][5]
Definition: vp56.h:115
uint8_t coeff_acct[2][3][3][6][5]
Definition: vp56.h:114
Definition: vp56.h:65
static const uint8_t vp5_vmc_pct[2][11]
Definition: vp5data.h:42
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:521
const VP56Tree ff_vp56_pva_tree[]
Definition: vp56data.c:49
int16_t x
Definition: vp56.h:66
common internal api header.
static void vp5_default_models_init(VP56Context *s)
Definition: vp5.c:260
static double c[64]
void * priv_data
Definition: avcodec.h:1554
uint8_t vector_pdv[2][7]
Definition: vp56.h:110
static const double coeff[2][5]
Definition: vf_owdenoise.c:71
const uint8_t * buffer
Definition: vp56.h:88
static void comp(unsigned char *dst, int dst_stride, unsigned char *src, int src_stride, int add)
Definition: eamad.c:83
static const uint8_t vp5_coeff_groups[]
Definition: vp5data.h:31
const uint8_t ff_vp56_def_mb_types_stats[3][10][2]
Definition: vp56data.c:40
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:857
uint8_t vector_dct[2]
Definition: vp56.h:108
static int vp56_rac_gets(VP56RangeCoder *c, int bits)
Definition: vp56.h:312