FFmpeg  4.4.5
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  int ret;
42 
43  ret = ff_vp56_init_range_decoder(&s->c, buf, buf_size);
44  if (ret < 0)
45  return ret;
46  s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
47  vp56_rac_get(c);
49  if (s->frames[VP56_FRAME_CURRENT]->key_frame)
50  {
51  int render_x, render_y;
52 
53  vp56_rac_gets(c, 8);
54  if(vp56_rac_gets(c, 5) > 5)
55  return AVERROR_INVALIDDATA;
56  vp56_rac_gets(c, 2);
57  if (vp56_rac_get(c)) {
58  avpriv_report_missing_feature(s->avctx, "Interlacing");
59  return AVERROR_PATCHWELCOME;
60  }
61  rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
62  cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
63  if (!rows || !cols) {
64  av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n",
65  cols << 4, rows << 4);
66  return AVERROR_INVALIDDATA;
67  }
68  render_y = vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
69  render_x = vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
70  if (render_x == 0 || render_x > cols ||
71  render_y == 0 || render_y > rows)
72  return AVERROR_INVALIDDATA;
73  vp56_rac_gets(c, 2);
74  if (!s->macroblocks || /* first frame */
75  16*cols != s->avctx->coded_width ||
76  16*rows != s->avctx->coded_height) {
77  int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
78  if (ret < 0)
79  return ret;
80  return VP56_SIZE_CHANGE;
81  }
82  } else if (!s->macroblocks)
83  return AVERROR_INVALIDDATA;
84  return 0;
85 }
86 
87 static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
88 {
89  VP56RangeCoder *c = &s->c;
90  VP56Model *model = s->modelp;
91  int comp, di;
92 
93  for (comp=0; comp<2; comp++) {
94  int delta = 0;
96  int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
97  di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
98  di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
100  model->vector_pdv[comp]);
101  delta = di | (delta << 2);
102  delta = (delta ^ -sign) + sign;
103  }
104  if (!comp)
105  vect->x = delta;
106  else
107  vect->y = delta;
108  }
109 }
110 
111 static void vp5_parse_vector_models(VP56Context *s)
112 {
113  VP56RangeCoder *c = &s->c;
114  VP56Model *model = s->modelp;
115  int comp, node;
116 
117  for (comp=0; comp<2; comp++) {
119  model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
121  model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
123  model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
125  model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
126  }
127 
128  for (comp=0; comp<2; comp++)
129  for (node=0; node<7; node++)
130  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][4 + node]))
131  model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
132 }
133 
134 static int vp5_parse_coeff_models(VP56Context *s)
135 {
136  VP56RangeCoder *c = &s->c;
137  VP56Model *model = s->modelp;
138  uint8_t def_prob[11];
139  int node, cg, ctx;
140  int ct; /* code type */
141  int pt; /* plane type (0 for Y, 1 for U or V) */
142 
143  memset(def_prob, 0x80, sizeof(def_prob));
144 
145  for (pt=0; pt<2; pt++)
146  for (node=0; node<11; node++)
148  def_prob[node] = vp56_rac_gets_nn(c, 7);
149  model->coeff_dccv[pt][node] = def_prob[node];
150  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
151  model->coeff_dccv[pt][node] = def_prob[node];
152  }
153 
154  for (ct=0; ct<3; ct++)
155  for (pt=0; pt<2; pt++)
156  for (cg=0; cg<6; cg++)
157  for (node=0; node<11; node++)
158  if (vp56_rac_get_prob_branchy(c, vp5_ract_pct[ct][pt][cg][node])) {
159  def_prob[node] = vp56_rac_gets_nn(c, 7);
160  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
161  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
162  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
163  }
164 
165  /* coeff_dcct is a linear combination of coeff_dccv */
166  for (pt=0; pt<2; pt++)
167  for (ctx=0; ctx<36; ctx++)
168  for (node=0; node<5; node++)
169  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);
170 
171  /* coeff_acct is a linear combination of coeff_ract */
172  for (ct=0; ct<3; ct++)
173  for (pt=0; pt<2; pt++)
174  for (cg=0; cg<3; cg++)
175  for (ctx=0; ctx<6; ctx++)
176  for (node=0; node<5; node++)
177  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);
178  return 0;
179 }
180 
181 static int vp5_parse_coeff(VP56Context *s)
182 {
183  VP56RangeCoder *c = &s->c;
184  VP56Model *model = s->modelp;
185  uint8_t *permute = s->idct_scantable;
186  uint8_t *model1, *model2;
187  int coeff, sign, coeff_idx;
188  int b, i, cg, idx, ctx, ctx_last;
189  int pt = 0; /* plane type (0 for Y, 1 for U or V) */
190 
191  if (vpX_rac_is_end(c)) {
192  av_log(s->avctx, AV_LOG_ERROR, "End of AC stream reached in vp5_parse_coeff\n");
193  return AVERROR_INVALIDDATA;
194  }
195 
196  for (b=0; b<6; b++) {
197  int ct = 1; /* code type */
198 
199  if (b > 3) pt = 1;
200 
201  ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0]
202  + s->above_blocks[s->above_block_idx[b]].not_null_dc;
203  model1 = model->coeff_dccv[pt];
204  model2 = model->coeff_dcct[pt][ctx];
205 
206  coeff_idx = 0;
207  for (;;) {
208  if (vp56_rac_get_prob_branchy(c, model2[0])) {
209  if (vp56_rac_get_prob_branchy(c, model2[2])) {
210  if (vp56_rac_get_prob_branchy(c, model2[3])) {
211  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4;
212  idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
213  sign = vp56_rac_get(c);
214  coeff = ff_vp56_coeff_bias[idx+5];
215  for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
217  } else {
218  if (vp56_rac_get_prob_branchy(c, model2[4])) {
219  coeff = 3 + vp56_rac_get_prob(c, model1[5]);
220  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3;
221  } else {
222  coeff = 2;
223  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2;
224  }
225  sign = vp56_rac_get(c);
226  }
227  ct = 2;
228  } else {
229  ct = 1;
230  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1;
231  sign = vp56_rac_get(c);
232  coeff = 1;
233  }
234  coeff = (coeff ^ -sign) + sign;
235  if (coeff_idx)
236  coeff *= s->dequant_ac;
237  s->block_coeff[b][permute[coeff_idx]] = coeff;
238  } else {
239  if (ct && !vp56_rac_get_prob_branchy(c, model2[1]))
240  break;
241  ct = 0;
242  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0;
243  }
244  coeff_idx++;
245  if (coeff_idx >= 64)
246  break;
247 
248  cg = vp5_coeff_groups[coeff_idx];
249  ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx];
250  model1 = model->coeff_ract[pt][ct][cg];
251  model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
252  }
253 
254  ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24);
255  s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx;
256  if (coeff_idx < ctx_last)
257  for (i=coeff_idx; i<=ctx_last; i++)
258  s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5;
259  s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0];
260  s->idct_selector[b] = 63;
261  }
262  return 0;
263 }
264 
265 static void vp5_default_models_init(VP56Context *s)
266 {
267  VP56Model *model = s->modelp;
268  int i;
269 
270  for (i=0; i<2; i++) {
271  model->vector_sig[i] = 0x80;
272  model->vector_dct[i] = 0x80;
273  model->vector_pdi[i][0] = 0x55;
274  model->vector_pdi[i][1] = 0x80;
275  }
276  memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
277  memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
278 }
279 
281 {
282  VP56Context *s = avctx->priv_data;
283  int ret;
284 
285  if ((ret = ff_vp56_init(avctx, 1, 0)) < 0)
286  return ret;
287  ff_vp5dsp_init(&s->vp56dsp);
288  s->vp56_coord_div = vp5_coord_div;
289  s->parse_vector_adjustment = vp5_parse_vector_adjustment;
290  s->parse_coeff = vp5_parse_coeff;
291  s->default_models_init = vp5_default_models_init;
292  s->parse_vector_models = vp5_parse_vector_models;
293  s->parse_coeff_models = vp5_parse_coeff_models;
294  s->parse_header = vp5_parse_header;
295 
296  return 0;
297 }
298 
300  .name = "vp5",
301  .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),
302  .type = AVMEDIA_TYPE_VIDEO,
303  .id = AV_CODEC_ID_VP5,
304  .priv_data_size = sizeof(VP56Context),
306  .close = ff_vp56_free,
308  .capabilities = AV_CODEC_CAP_DR1,
309 };
#define av_cold
Definition: attributes.h:88
uint8_t
Libavcodec external API header.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
#define s(width, name)
Definition: cbs_vp9.c:257
#define FFMIN(a, b)
Definition: common.h:105
#define av_clip
Definition: common.h:122
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
static void comp(unsigned char *dst, ptrdiff_t dst_stride, unsigned char *src, ptrdiff_t src_stride, int add)
Definition: eamad.c:85
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
@ AV_CODEC_ID_VP5
Definition: codec_id.h:139
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
int i
Definition: input.c:407
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:84
common internal API header
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
void avpriv_report_missing_feature(void *avc, const char *msg,...) av_printf_format(2
Log a generic warning message about a missing feature.
static void permute(uint8_t *dst, const uint8_t *src, const uint8_t permutation[64])
Definition: proresdec2.c:44
int pt
Definition: rtp.c:35
main external API structure.
Definition: avcodec.h:536
void * priv_data
Definition: avcodec.h:563
AVCodec.
Definition: codec.h:197
const char * name
Name of the codec implementation.
Definition: codec.h:204
uint8_t vector_dct[2]
Definition: vp56.h:113
uint8_t coeff_dcct[2][36][5]
Definition: vp56.h:120
uint8_t coeff_acct[2][3][3][6][5]
Definition: vp56.h:119
uint8_t vector_pdi[2][2]
Definition: vp56.h:114
uint8_t vector_pdv[2][7]
Definition: vp56.h:115
uint8_t vector_sig[2]
Definition: vp56.h:112
uint8_t mb_types_stats[3][10][2]
Definition: vp56.h:123
uint8_t coeff_dccv[2][11]
Definition: vp56.h:117
uint8_t coeff_ract[2][3][6][11]
Definition: vp56.h:118
Definition: vp56.h:68
int16_t y
Definition: vp56.h:70
int16_t x
Definition: vp56.h:69
#define av_log(a,...)
AVFormatContext * ctx
Definition: movenc.c:48
const char * b
Definition: vf_curves.c:118
static const double coeff[2][5]
Definition: vf_owdenoise.c:73
float delta
av_cold int ff_vp56_free(AVCodecContext *avctx)
Definition: vp56.c:835
void ff_vp56_init_dequant(VP56Context *s, int quantizer)
Definition: vp56.c:34
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: vp56.c:568
av_cold int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
Definition: vp56.c:776
VP5 and VP6 compatible video decoder (common features)
int ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size)
Definition: vp56rac.c:40
#define VP56_SIZE_CHANGE
Definition: vp56.h:73
static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
Definition: vp56.h:287
static int vp56_rac_gets(VP56RangeCoder *c, int bits)
Definition: vp56.h:329
#define vp56_rac_get_prob
Definition: vp56.h:270
@ VP56_FRAME_CURRENT
Definition: vp56.h:44
static av_always_inline int vpX_rac_is_end(VP56RangeCoder *c)
vp5689 returns 1 if the end of the stream has been reached, 0 otherwise.
Definition: vp56.h:239
static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
Definition: vp56.h:368
static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
Definition: vp56.h:305
static av_always_inline int vp56_rac_get_tree(VP56RangeCoder *c, const VP56Tree *tree, const uint8_t *probs)
Definition: vp56.h:381
const VP56Tree ff_vp56_pva_tree[]
Definition: vp56data.c:49
const uint8_t ff_vp56_def_mb_types_stats[3][10][2]
Definition: vp56data.c:40
const uint8_t ff_vp56_b6to4[]
Definition: vp56data.c:29
const uint8_t ff_vp56_coeff_bias[]
Definition: vp56data.c:67
const uint8_t ff_vp56_coeff_bit_length[]
Definition: vp56data.c:68
const uint8_t ff_vp56_coeff_parse_table[6][11]
Definition: vp56data.c:31
const VP56Tree ff_vp56_pc_tree[]
Definition: vp56data.c:59
VP5 and VP6 compatible video decoder (common data)
void ff_vp5dsp_init(VP56DSPContext *s)
static av_cold int vp5_decode_init(AVCodecContext *avctx)
Definition: vp5.c:280
static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
Definition: vp5.c:87
static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
Definition: vp5.c:37
static void vp5_default_models_init(VP56Context *s)
Definition: vp5.c:265
static void vp5_parse_vector_models(VP56Context *s)
Definition: vp5.c:111
static int vp5_parse_coeff_models(VP56Context *s)
Definition: vp5.c:134
AVCodec ff_vp5_decoder
Definition: vp5.c:299
static int vp5_parse_coeff(VP56Context *s)
Definition: vp5.c:181
VP5 compatible video decoder.
static const uint8_t vp5_coord_div[]
Definition: vp5data.h:175
static const uint8_t vp5_vmc_pct[2][11]
Definition: vp5data.h:42
static const uint8_t vp5_ract_pct[3][2][6][11]
Definition: vp5data.h:52
static const uint8_t vp5_dccv_pct[2][11]
Definition: vp5data.h:47
static const uint8_t vp5_coeff_groups[]
Definition: vp5data.h:31
static const int16_t vp5_dccv_lc[5][36][2]
Definition: vp5data.h:91
static const int16_t vp5_ract_lc[3][3][5][6][2]
Definition: vp5data.h:124
static double c[64]