Libav
vp5.c
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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 #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  int *golden_frame)
40 {
41  VP56RangeCoder *c = &s->c;
42  int rows, cols;
43 
44  ff_vp56_init_range_decoder(&s->c, buf, buf_size);
45  s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
46  vp56_rac_get(c);
48  if (s->frames[VP56_FRAME_CURRENT]->key_frame)
49  {
50  vp56_rac_gets(c, 8);
51  if(vp56_rac_gets(c, 5) > 5)
52  return AVERROR_INVALIDDATA;
53  vp56_rac_gets(c, 2);
54  if (vp56_rac_get(c)) {
55  av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
56  return AVERROR_PATCHWELCOME;
57  }
58  rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
59  cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
60  if (!rows || !cols) {
61  av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n",
62  cols << 4, rows << 4);
63  return AVERROR_INVALIDDATA;
64  }
65  vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
66  vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
67  vp56_rac_gets(c, 2);
68  if (!s->macroblocks || /* first frame */
69  16*cols != s->avctx->coded_width ||
70  16*rows != s->avctx->coded_height) {
71  int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
72  if (ret < 0)
73  return ret;
74  return VP56_SIZE_CHANGE;
75  }
76  } else if (!s->macroblocks)
77  return AVERROR_INVALIDDATA;
78  return 0;
79 }
80 
81 static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
82 {
83  VP56RangeCoder *c = &s->c;
84  VP56Model *model = s->modelp;
85  int comp, di;
86 
87  for (comp=0; comp<2; comp++) {
88  int delta = 0;
89  if (vp56_rac_get_prob(c, model->vector_dct[comp])) {
90  int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
91  di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
92  di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
94  model->vector_pdv[comp]);
95  delta = di | (delta << 2);
96  delta = (delta ^ -sign) + sign;
97  }
98  if (!comp)
99  vect->x = delta;
100  else
101  vect->y = delta;
102  }
103 }
104 
105 static void vp5_parse_vector_models(VP56Context *s)
106 {
107  VP56RangeCoder *c = &s->c;
108  VP56Model *model = s->modelp;
109  int comp, node;
110 
111  for (comp=0; comp<2; comp++) {
112  if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][0]))
113  model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
114  if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][1]))
115  model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
116  if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][2]))
117  model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
118  if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][3]))
119  model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
120  }
121 
122  for (comp=0; comp<2; comp++)
123  for (node=0; node<7; node++)
124  if (vp56_rac_get_prob(c, vp5_vmc_pct[comp][4 + node]))
125  model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
126 }
127 
128 static int vp5_parse_coeff_models(VP56Context *s)
129 {
130  VP56RangeCoder *c = &s->c;
131  VP56Model *model = s->modelp;
132  uint8_t def_prob[11];
133  int node, cg, ctx;
134  int ct; /* code type */
135  int pt; /* plane type (0 for Y, 1 for U or V) */
136 
137  memset(def_prob, 0x80, sizeof(def_prob));
138 
139  for (pt=0; pt<2; pt++)
140  for (node=0; node<11; node++)
141  if (vp56_rac_get_prob(c, vp5_dccv_pct[pt][node])) {
142  def_prob[node] = vp56_rac_gets_nn(c, 7);
143  model->coeff_dccv[pt][node] = def_prob[node];
144  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
145  model->coeff_dccv[pt][node] = def_prob[node];
146  }
147 
148  for (ct=0; ct<3; ct++)
149  for (pt=0; pt<2; pt++)
150  for (cg=0; cg<6; cg++)
151  for (node=0; node<11; node++)
152  if (vp56_rac_get_prob(c, vp5_ract_pct[ct][pt][cg][node])) {
153  def_prob[node] = vp56_rac_gets_nn(c, 7);
154  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
155  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
156  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
157  }
158 
159  /* coeff_dcct is a linear combination of coeff_dccv */
160  for (pt=0; pt<2; pt++)
161  for (ctx=0; ctx<36; ctx++)
162  for (node=0; node<5; node++)
163  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);
164 
165  /* coeff_acct is a linear combination of coeff_ract */
166  for (ct=0; ct<3; ct++)
167  for (pt=0; pt<2; pt++)
168  for (cg=0; cg<3; cg++)
169  for (ctx=0; ctx<6; ctx++)
170  for (node=0; node<5; node++)
171  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);
172  return 0;
173 }
174 
175 static void vp5_parse_coeff(VP56Context *s)
176 {
177  VP56RangeCoder *c = &s->c;
178  VP56Model *model = s->modelp;
179  uint8_t *permute = s->idct_scantable;
180  uint8_t *model1, *model2;
181  int coeff, sign, coeff_idx;
182  int b, i, cg, idx, ctx, ctx_last;
183  int pt = 0; /* plane type (0 for Y, 1 for U or V) */
184 
185  for (b=0; b<6; b++) {
186  int ct = 1; /* code type */
187 
188  if (b > 3) pt = 1;
189 
190  ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0]
191  + s->above_blocks[s->above_block_idx[b]].not_null_dc;
192  model1 = model->coeff_dccv[pt];
193  model2 = model->coeff_dcct[pt][ctx];
194 
195  coeff_idx = 0;
196  for (;;) {
197  if (vp56_rac_get_prob(c, model2[0])) {
198  if (vp56_rac_get_prob(c, model2[2])) {
199  if (vp56_rac_get_prob(c, model2[3])) {
200  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4;
201  idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
202  sign = vp56_rac_get(c);
203  coeff = ff_vp56_coeff_bias[idx+5];
204  for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
205  coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
206  } else {
207  if (vp56_rac_get_prob(c, model2[4])) {
208  coeff = 3 + vp56_rac_get_prob(c, model1[5]);
209  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3;
210  } else {
211  coeff = 2;
212  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2;
213  }
214  sign = vp56_rac_get(c);
215  }
216  ct = 2;
217  } else {
218  ct = 1;
219  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1;
220  sign = vp56_rac_get(c);
221  coeff = 1;
222  }
223  coeff = (coeff ^ -sign) + sign;
224  if (coeff_idx)
225  coeff *= s->dequant_ac;
226  s->block_coeff[b][permute[coeff_idx]] = coeff;
227  } else {
228  if (ct && !vp56_rac_get_prob(c, model2[1]))
229  break;
230  ct = 0;
231  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0;
232  }
233  coeff_idx++;
234  if (coeff_idx >= 64)
235  break;
236 
237  cg = vp5_coeff_groups[coeff_idx];
238  ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx];
239  model1 = model->coeff_ract[pt][ct][cg];
240  model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
241  }
242 
243  ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24);
244  s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx;
245  if (coeff_idx < ctx_last)
246  for (i=coeff_idx; i<=ctx_last; i++)
247  s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5;
248  s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0];
249  }
250 }
251 
252 static void vp5_default_models_init(VP56Context *s)
253 {
254  VP56Model *model = s->modelp;
255  int i;
256 
257  for (i=0; i<2; i++) {
258  model->vector_sig[i] = 0x80;
259  model->vector_dct[i] = 0x80;
260  model->vector_pdi[i][0] = 0x55;
261  model->vector_pdi[i][1] = 0x80;
262  }
263  memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
264  memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
265 }
266 
268 {
269  VP56Context *s = avctx->priv_data;
270  int ret;
271 
272  if ((ret = ff_vp56_init(avctx, 1, 0)) < 0)
273  return ret;
274  s->vp56_coord_div = vp5_coord_div;
275  s->parse_vector_adjustment = vp5_parse_vector_adjustment;
276  s->parse_coeff = vp5_parse_coeff;
277  s->default_models_init = vp5_default_models_init;
278  s->parse_vector_models = vp5_parse_vector_models;
279  s->parse_coeff_models = vp5_parse_coeff_models;
280  s->parse_header = vp5_parse_header;
281 
282  return 0;
283 }
284 
286  .name = "vp5",
287  .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),
288  .type = AVMEDIA_TYPE_VIDEO,
289  .id = AV_CODEC_ID_VP5,
290  .priv_data_size = sizeof(VP56Context),
292  .close = ff_vp56_free,
294  .capabilities = CODEC_CAP_DR1,
295 };
av_cold int ff_vp56_free(AVCodecContext *avctx)
Definition: vp56.c:702
uint8_t coeff_ract[2][3][6][11]
Definition: vp56.h:113
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:54
VP5 and VP6 compatible video decoder (common features)
static av_cold int vp5_decode_init(AVCodecContext *avctx)
Definition: vp5.c:267
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:133
const uint8_t ff_vp56_coeff_bias[]
Definition: vp56data.c:67
uint8_t coeff_dccv[2][11]
Definition: vp56.h:112
uint8_t mb_types_stats[3][10][2]
Definition: vp56.h:118
uint8_t vector_sig[2]
Definition: vp56.h:107
static const uint8_t vp5_coord_div[]
Definition: vp5data.h:175
static int vp5_parse_coeff_models(VP56Context *s)
Definition: vp5.c:128
#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:81
av_cold int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
Definition: vp56.c:653
AVCodec.
Definition: avcodec.h:2796
static const uint8_t vp5_ract_pct[3][2][6][11]
Definition: vp5data.h:52
int16_t y
Definition: vp56.h:67
static int decode(MimicContext *ctx, int quality, int num_coeffs, int is_iframe)
Definition: mimic.c:275
uint8_t
#define av_cold
Definition: attributes.h:66
float delta
#define b
Definition: input.c:52
#define CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:684
int pt
Definition: rtp.c:34
static void permute(int16_t dst[64], const int16_t src[64], enum idct_permutation_type perm_type)
Definition: dct-test.c:119
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:354
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:123
static void vp5_parse_vector_models(VP56Context *s)
Definition: vp5.c:105
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:150
static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
Definition: vp56.h:278
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:168
const char * name
Name of the codec implementation.
Definition: avcodec.h:2803
void ff_vp56_init_dequant(VP56Context *s, int quantizer)
Definition: vp56.c:34
const uint8_t ff_vp56_b6to4[]
Definition: vp56data.c:29
AVCodec ff_vp5_decoder
Definition: vp5.c:285
VP5 and VP6 compatible video decoder (common data)
static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
Definition: vp56.h:341
#define FFMIN(a, b)
Definition: common.h:57
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:492
const uint8_t ff_vp56_coeff_bit_length[]
Definition: vp56data.c:68
#define vp56_rac_get_prob
Definition: vp56.h:243
static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size, int *golden_frame)
Definition: vp5.c:38
#define AVERROR_PATCHWELCOME
Not yet implemented in Libav, patches welcome.
Definition: error.h:57
static const int16_t vp5_dccv_lc[5][36][2]
Definition: vp5data.h:91
Libavcodec external API header.
const VP56Tree ff_vp56_pc_tree[]
Definition: vp56data.c:59
main external API structure.
Definition: avcodec.h:1050
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:490
const uint8_t ff_vp56_coeff_parse_table[6][11]
Definition: vp56data.c:31
uint8_t coeff_dcct[2][36][5]
Definition: vp56.h:115
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
static const uint8_t vp5_vmc_pct[2][11]
Definition: vp5data.h:42
const VP56Tree ff_vp56_pva_tree[]
Definition: vp56data.c:49
static void vp5_parse_coeff(VP56Context *s)
Definition: vp5.c:175
int16_t x
Definition: vp56.h:66
common internal api header.
static void vp5_default_models_init(VP56Context *s)
Definition: vp5.c:252
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:499
void * priv_data
Definition: avcodec.h:1092
static av_unused int vp56_rac_gets(VP56RangeCoder *c, int bits)
Definition: vp56.h:302
uint8_t vector_pdv[2][7]
Definition: vp56.h:110
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
uint8_t vector_dct[2]
Definition: vp56.h:108