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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 "internal.h"
31 
32 #include "vp56.h"
33 #include "vp56data.h"
34 #include "vp5data.h"
35 
36 
37 static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
38 {
39  VP56RangeCoder *c = &s->c;
40  int rows, cols;
41 
42  ff_vp56_init_range_decoder(&s->c, buf, buf_size);
43  s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
44  vp56_rac_get(c);
46  if (s->frames[VP56_FRAME_CURRENT]->key_frame)
47  {
48  vp56_rac_gets(c, 8);
49  if(vp56_rac_gets(c, 5) > 5)
50  return AVERROR_INVALIDDATA;
51  vp56_rac_gets(c, 2);
52  if (vp56_rac_get(c)) {
53  av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
54  return AVERROR_PATCHWELCOME;
55  }
56  rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
57  cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
58  if (!rows || !cols) {
59  av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n",
60  cols << 4, rows << 4);
61  return AVERROR_INVALIDDATA;
62  }
63  vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
64  vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
65  vp56_rac_gets(c, 2);
66  if (!s->macroblocks || /* first frame */
67  16*cols != s->avctx->coded_width ||
68  16*rows != s->avctx->coded_height) {
69  int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
70  if (ret < 0)
71  return ret;
72  return VP56_SIZE_CHANGE;
73  }
74  } else if (!s->macroblocks)
75  return AVERROR_INVALIDDATA;
76  return 0;
77 }
78 
79 static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
80 {
81  VP56RangeCoder *c = &s->c;
82  VP56Model *model = s->modelp;
83  int comp, di;
84 
85  for (comp=0; comp<2; comp++) {
86  int delta = 0;
87  if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) {
88  int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
89  di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
90  di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
92  model->vector_pdv[comp]);
93  delta = di | (delta << 2);
94  delta = (delta ^ -sign) + sign;
95  }
96  if (!comp)
97  vect->x = delta;
98  else
99  vect->y = delta;
100  }
101 }
102 
103 static void vp5_parse_vector_models(VP56Context *s)
104 {
105  VP56RangeCoder *c = &s->c;
106  VP56Model *model = s->modelp;
107  int comp, node;
108 
109  for (comp=0; comp<2; comp++) {
110  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][0]))
111  model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
112  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][1]))
113  model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
114  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][2]))
115  model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
116  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][3]))
117  model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
118  }
119 
120  for (comp=0; comp<2; comp++)
121  for (node=0; node<7; node++)
122  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][4 + node]))
123  model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
124 }
125 
126 static int vp5_parse_coeff_models(VP56Context *s)
127 {
128  VP56RangeCoder *c = &s->c;
129  VP56Model *model = s->modelp;
130  uint8_t def_prob[11];
131  int node, cg, ctx;
132  int ct; /* code type */
133  int pt; /* plane type (0 for Y, 1 for U or V) */
134 
135  memset(def_prob, 0x80, sizeof(def_prob));
136 
137  for (pt=0; pt<2; pt++)
138  for (node=0; node<11; node++)
139  if (vp56_rac_get_prob_branchy(c, vp5_dccv_pct[pt][node])) {
140  def_prob[node] = vp56_rac_gets_nn(c, 7);
141  model->coeff_dccv[pt][node] = def_prob[node];
142  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
143  model->coeff_dccv[pt][node] = def_prob[node];
144  }
145 
146  for (ct=0; ct<3; ct++)
147  for (pt=0; pt<2; pt++)
148  for (cg=0; cg<6; cg++)
149  for (node=0; node<11; node++)
150  if (vp56_rac_get_prob_branchy(c, vp5_ract_pct[ct][pt][cg][node])) {
151  def_prob[node] = vp56_rac_gets_nn(c, 7);
152  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
153  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
154  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
155  }
156 
157  /* coeff_dcct is a linear combination of coeff_dccv */
158  for (pt=0; pt<2; pt++)
159  for (ctx=0; ctx<36; ctx++)
160  for (node=0; node<5; node++)
161  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);
162 
163  /* coeff_acct is a linear combination of coeff_ract */
164  for (ct=0; ct<3; ct++)
165  for (pt=0; pt<2; pt++)
166  for (cg=0; cg<3; cg++)
167  for (ctx=0; ctx<6; ctx++)
168  for (node=0; node<5; node++)
169  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);
170  return 0;
171 }
172 
173 static int vp5_parse_coeff(VP56Context *s)
174 {
175  VP56RangeCoder *c = &s->c;
176  VP56Model *model = s->modelp;
177  uint8_t *permute = s->idct_scantable;
178  uint8_t *model1, *model2;
179  int coeff, sign, coeff_idx;
180  int b, i, cg, idx, ctx, ctx_last;
181  int pt = 0; /* plane type (0 for Y, 1 for U or V) */
182 
183  if (c->end <= c->buffer && c->bits >= 0) {
184  av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp5_parse_coeff\n");
185  return AVERROR_INVALIDDATA;
186  }
187 
188  for (b=0; b<6; b++) {
189  int ct = 1; /* code type */
190 
191  if (b > 3) pt = 1;
192 
193  ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0]
194  + s->above_blocks[s->above_block_idx[b]].not_null_dc;
195  model1 = model->coeff_dccv[pt];
196  model2 = model->coeff_dcct[pt][ctx];
197 
198  coeff_idx = 0;
199  for (;;) {
200  if (vp56_rac_get_prob_branchy(c, model2[0])) {
201  if (vp56_rac_get_prob_branchy(c, model2[2])) {
202  if (vp56_rac_get_prob_branchy(c, model2[3])) {
203  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4;
204  idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
205  sign = vp56_rac_get(c);
206  coeff = ff_vp56_coeff_bias[idx+5];
207  for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
208  coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
209  } else {
210  if (vp56_rac_get_prob_branchy(c, model2[4])) {
211  coeff = 3 + vp56_rac_get_prob(c, model1[5]);
212  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3;
213  } else {
214  coeff = 2;
215  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2;
216  }
217  sign = vp56_rac_get(c);
218  }
219  ct = 2;
220  } else {
221  ct = 1;
222  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1;
223  sign = vp56_rac_get(c);
224  coeff = 1;
225  }
226  coeff = (coeff ^ -sign) + sign;
227  if (coeff_idx)
228  coeff *= s->dequant_ac;
229  s->block_coeff[b][permute[coeff_idx]] = coeff;
230  } else {
231  if (ct && !vp56_rac_get_prob_branchy(c, model2[1]))
232  break;
233  ct = 0;
234  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0;
235  }
236  coeff_idx++;
237  if (coeff_idx >= 64)
238  break;
239 
240  cg = vp5_coeff_groups[coeff_idx];
241  ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx];
242  model1 = model->coeff_ract[pt][ct][cg];
243  model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
244  }
245 
246  ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24);
247  s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx;
248  if (coeff_idx < ctx_last)
249  for (i=coeff_idx; i<=ctx_last; i++)
250  s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5;
251  s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0];
252  }
253  return 0;
254 }
255 
256 static void vp5_default_models_init(VP56Context *s)
257 {
258  VP56Model *model = s->modelp;
259  int i;
260 
261  for (i=0; i<2; i++) {
262  model->vector_sig[i] = 0x80;
263  model->vector_dct[i] = 0x80;
264  model->vector_pdi[i][0] = 0x55;
265  model->vector_pdi[i][1] = 0x80;
266  }
267  memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
268  memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
269 }
270 
272 {
273  VP56Context *s = avctx->priv_data;
274  int ret;
275 
276  if ((ret = ff_vp56_init(avctx, 1, 0)) < 0)
277  return ret;
278  s->vp56_coord_div = vp5_coord_div;
279  s->parse_vector_adjustment = vp5_parse_vector_adjustment;
280  s->parse_coeff = vp5_parse_coeff;
281  s->default_models_init = vp5_default_models_init;
282  s->parse_vector_models = vp5_parse_vector_models;
283  s->parse_coeff_models = vp5_parse_coeff_models;
284  s->parse_header = vp5_parse_header;
285 
286  return 0;
287 }
288 
290  .name = "vp5",
291  .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),
292  .type = AVMEDIA_TYPE_VIDEO,
293  .id = AV_CODEC_ID_VP5,
294  .priv_data_size = sizeof(VP56Context),
296  .close = ff_vp56_free,
298  .capabilities = AV_CODEC_CAP_DR1,
299 };
av_cold int ff_vp56_free(AVCodecContext *avctx)
Definition: vp56.c:824
uint8_t coeff_ract[2][3][6][11]
Definition: vp56.h:113
const char * s
Definition: avisynth_c.h:768
#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:271
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:210
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:37
uint8_t vector_sig[2]
Definition: vp56.h:107
const char * b
Definition: vf_curves.c:113
static const uint8_t vp5_coord_div[]
Definition: vp5data.h:175
static int vp5_parse_coeff_models(VP56Context *s)
Definition: vp5.c:126
#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:79
av_cold int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
Definition: vp56.c:764
AVCodec.
Definition: avcodec.h:3646
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:82
float delta
static int vp5_parse_coeff(VP56Context *s)
Definition: vp5.c:173
int pt
Definition: rtp.c:35
static av_always_inline int vp56_rac_get_tree(VP56RangeCoder *c, const VP56Tree *tree, const uint8_t *probs)
Definition: vp56.h:361
#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:103
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:180
static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
Definition: vp56.h:285
const char * name
Name of the codec implementation.
Definition: avcodec.h:3653
void ff_vp56_init_dequant(VP56Context *s, int quantizer)
Definition: vp56.c:34
const uint8_t ff_vp56_b6to4[]
Definition: vp56data.c:29
const uint8_t * end
Definition: vp56.h:89
AVCodec ff_vp5_decoder
Definition: vp5.c:289
VP5 and VP6 compatible video decoder (common data)
static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
Definition: vp56.h:348
#define FFMIN(a, b)
Definition: common.h:96
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
AVFormatContext * ctx
Definition: movenc.c:48
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: vp56.c:573
const uint8_t ff_vp56_coeff_bit_length[]
Definition: vp56data.c:68
#define vp56_rac_get_prob
Definition: vp56.h:250
#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:267
Libavcodec external API header.
const VP56Tree ff_vp56_pc_tree[]
Definition: vp56data.c:59
main external API structure.
Definition: avcodec.h:1691
static void permute(uint8_t *dst, const uint8_t *src, const uint8_t permutation[64])
Definition: proresdec2.c:40
void * buf
Definition: avisynth_c.h:690
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
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
int16_t x
Definition: vp56.h:66
common internal api header.
static void vp5_default_models_init(VP56Context *s)
Definition: vp5.c:256
static double c[64]
void * priv_data
Definition: avcodec.h:1733
uint8_t vector_pdv[2][7]
Definition: vp56.h:110
static const double coeff[2][5]
Definition: vf_owdenoise.c:72
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
static int decode(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *pkt)
Definition: ffmpeg.c:2045
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:968
uint8_t vector_dct[2]
Definition: vp56.h:108
static int vp56_rac_gets(VP56RangeCoder *c, int bits)
Definition: vp56.h:309