FFmpeg: libavcodec/vp5.c Source File

FFmpeg
vp5.c
Go to the documentation of this file.
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 
43  ff_vp56_init_range_decoder(&s->c, buf, buf_size);
44  s->frames[VP56_FRAME_CURRENT]->key_frame = !vp56_rac_get(c);
45  vp56_rac_get(c);
46  ff_vp56_init_dequant(s, vp56_rac_gets(c, 6));
47  if (s->frames[VP56_FRAME_CURRENT]->key_frame)
48  {
49  vp56_rac_gets(c, 8);
50  if(vp56_rac_gets(c, 5) > 5)
51  return AVERROR_INVALIDDATA;
52  vp56_rac_gets(c, 2);
53  if (vp56_rac_get(c)) {
54  av_log(s->avctx, AV_LOG_ERROR, "interlacing not supported\n");
55  return AVERROR_PATCHWELCOME;
56  }
57  rows = vp56_rac_gets(c, 8); /* number of stored macroblock rows */
58  cols = vp56_rac_gets(c, 8); /* number of stored macroblock cols */
59  if (!rows || !cols) {
60  av_log(s->avctx, AV_LOG_ERROR, "Invalid size %dx%d\n",
61  cols << 4, rows << 4);
62  return AVERROR_INVALIDDATA;
63  }
64  vp56_rac_gets(c, 8); /* number of displayed macroblock rows */
65  vp56_rac_gets(c, 8); /* number of displayed macroblock cols */
66  vp56_rac_gets(c, 2);
67  if (!s->macroblocks || /* first frame */
68  16*cols != s->avctx->coded_width ||
69  16*rows != s->avctx->coded_height) {
70  int ret = ff_set_dimensions(s->avctx, 16 * cols, 16 * rows);
71  if (ret < 0)
72  return ret;
73  return VP56_SIZE_CHANGE;
74  }
75  } else if (!s->macroblocks)
76  return AVERROR_INVALIDDATA;
77  return 0;
78 }
79 
80  static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
81 {
82  VP56RangeCoder *c = &s->c;
83  VP56Model *model = s->modelp;
84  int comp, di;
85 
86  for (comp=0; comp<2; comp++) {
87  int delta = 0;
88  if (vp56_rac_get_prob_branchy(c, model->vector_dct[comp])) {
89  int sign = vp56_rac_get_prob(c, model->vector_sig[comp]);
90  di = vp56_rac_get_prob(c, model->vector_pdi[comp][0]);
91  di |= vp56_rac_get_prob(c, model->vector_pdi[comp][1]) << 1;
92  delta = vp56_rac_get_tree(c, ff_vp56_pva_tree,
93  model->vector_pdv[comp]);
94  delta = di | (delta << 2);
95  delta = (delta ^ -sign) + sign;
96  }
97  if (!comp)
98  vect->x = delta;
99  else
100  vect->y = delta;
101  }
102 }
103 
104  static void vp5_parse_vector_models(VP56Context *s)
105 {
106  VP56RangeCoder *c = &s->c;
107  VP56Model *model = s->modelp;
108  int comp, node;
109 
110  for (comp=0; comp<2; comp++) {
111  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][0]))
112  model->vector_dct[comp] = vp56_rac_gets_nn(c, 7);
113  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][1]))
114  model->vector_sig[comp] = vp56_rac_gets_nn(c, 7);
115  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][2]))
116  model->vector_pdi[comp][0] = vp56_rac_gets_nn(c, 7);
117  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][3]))
118  model->vector_pdi[comp][1] = vp56_rac_gets_nn(c, 7);
119  }
120 
121  for (comp=0; comp<2; comp++)
122  for (node=0; node<7; node++)
123  if (vp56_rac_get_prob_branchy(c, vp5_vmc_pct[comp][4 + node]))
124  model->vector_pdv[comp][node] = vp56_rac_gets_nn(c, 7);
125 }
126 
127  static int vp5_parse_coeff_models(VP56Context *s)
128 {
129  VP56RangeCoder *c = &s->c;
130  VP56Model *model = s->modelp;
131  uint8_t def_prob[11];
132  int node, cg, ctx;
133  int ct; /* code type */
134  int pt; /* plane type (0 for Y, 1 for U or V) */
135 
136  memset(def_prob, 0x80, sizeof(def_prob));
137 
138  for (pt=0; pt<2; pt++)
139  for (node=0; node<11; node++)
140  if (vp56_rac_get_prob_branchy(c, vp5_dccv_pct[pt][node])) {
141  def_prob[node] = vp56_rac_gets_nn(c, 7);
142  model->coeff_dccv[pt][node] = def_prob[node];
143  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
144  model->coeff_dccv[pt][node] = def_prob[node];
145  }
146 
147  for (ct=0; ct<3; ct++)
148  for (pt=0; pt<2; pt++)
149  for (cg=0; cg<6; cg++)
150  for (node=0; node<11; node++)
151  if (vp56_rac_get_prob_branchy(c, vp5_ract_pct[ct][pt][cg][node])) {
152  def_prob[node] = vp56_rac_gets_nn(c, 7);
153  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
154  } else if (s->frames[VP56_FRAME_CURRENT]->key_frame) {
155  model->coeff_ract[pt][ct][cg][node] = def_prob[node];
156  }
157 
158  /* coeff_dcct is a linear combination of coeff_dccv */
159  for (pt=0; pt<2; pt++)
160  for (ctx=0; ctx<36; ctx++)
161  for (node=0; node<5; node++)
162  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);
163 
164  /* coeff_acct is a linear combination of coeff_ract */
165  for (ct=0; ct<3; ct++)
166  for (pt=0; pt<2; pt++)
167  for (cg=0; cg<3; cg++)
168  for (ctx=0; ctx<6; ctx++)
169  for (node=0; node<5; node++)
170  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);
171  return 0;
172 }
173 
174  static void vp5_parse_coeff(VP56Context *s)
175 {
176  VP56RangeCoder *c = &s->c;
177  VP56Model *model = s->modelp;
178  uint8_t *permute = s->idct_scantable;
179  uint8_t *model1, *model2;
180  int coeff, sign, coeff_idx;
181  int b, i, cg, idx, ctx, ctx_last;
182  int pt = 0; /* plane type (0 for Y, 1 for U or V) */
183 
184  for (b=0; b<6; b++) {
185  int ct = 1; /* code type */
186 
187  if (b > 3) pt = 1;
188 
189  ctx = 6*s->coeff_ctx[ff_vp56_b6to4[b]][0]
190  + s->above_blocks[s->above_block_idx[b]].not_null_dc;
191  model1 = model->coeff_dccv[pt];
192  model2 = model->coeff_dcct[pt][ctx];
193 
194  coeff_idx = 0;
195  for (;;) {
196  if (vp56_rac_get_prob_branchy(c, model2[0])) {
197  if (vp56_rac_get_prob_branchy(c, model2[2])) {
198  if (vp56_rac_get_prob_branchy(c, model2[3])) {
199  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 4;
200  idx = vp56_rac_get_tree(c, ff_vp56_pc_tree, model1);
201  sign = vp56_rac_get(c);
202  coeff = ff_vp56_coeff_bias[idx+5];
203  for (i=ff_vp56_coeff_bit_length[idx]; i>=0; i--)
204  coeff += vp56_rac_get_prob(c, ff_vp56_coeff_parse_table[idx][i]) << i;
205  } else {
206  if (vp56_rac_get_prob_branchy(c, model2[4])) {
207  coeff = 3 + vp56_rac_get_prob(c, model1[5]);
208  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 3;
209  } else {
210  coeff = 2;
211  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 2;
212  }
213  sign = vp56_rac_get(c);
214  }
215  ct = 2;
216  } else {
217  ct = 1;
218  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 1;
219  sign = vp56_rac_get(c);
220  coeff = 1;
221  }
222  coeff = (coeff ^ -sign) + sign;
223  if (coeff_idx)
224  coeff *= s->dequant_ac;
225  s->block_coeff[b][permute[coeff_idx]] = coeff;
226  } else {
227  if (ct && !vp56_rac_get_prob_branchy(c, model2[1]))
228  break;
229  ct = 0;
230  s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx] = 0;
231  }
232  coeff_idx++;
233  if (coeff_idx >= 64)
234  break;
235 
236  cg = vp5_coeff_groups[coeff_idx];
237  ctx = s->coeff_ctx[ff_vp56_b6to4[b]][coeff_idx];
238  model1 = model->coeff_ract[pt][ct][cg];
239  model2 = cg > 2 ? model1 : model->coeff_acct[pt][ct][cg][ctx];
240  }
241 
242  ctx_last = FFMIN(s->coeff_ctx_last[ff_vp56_b6to4[b]], 24);
243  s->coeff_ctx_last[ff_vp56_b6to4[b]] = coeff_idx;
244  if (coeff_idx < ctx_last)
245  for (i=coeff_idx; i<=ctx_last; i++)
246  s->coeff_ctx[ff_vp56_b6to4[b]][i] = 5;
247  s->above_blocks[s->above_block_idx[b]].not_null_dc = s->coeff_ctx[ff_vp56_b6to4[b]][0];
248  }
249 }
250 
251  static void vp5_default_models_init(VP56Context *s)
252 {
253  VP56Model *model = s->modelp;
254  int i;
255 
256  for (i=0; i<2; i++) {
257  model->vector_sig[i] = 0x80;
258  model->vector_dct[i] = 0x80;
259  model->vector_pdi[i][0] = 0x55;
260  model->vector_pdi[i][1] = 0x80;
261  }
262  memcpy(model->mb_types_stats, ff_vp56_def_mb_types_stats, sizeof(model->mb_types_stats));
263  memset(model->vector_pdv, 0x80, sizeof(model->vector_pdv));
264 }
265 
266  static av_cold int vp5_decode_init(AVCodecContext *avctx)
267 {
268  VP56Context *s = avctx->priv_data;
269  int ret;
270 
271  if ((ret = ff_vp56_init(avctx, 1, 0)) < 0)
272  return ret;
273  s->vp56_coord_div = vp5_coord_div;
274  s->parse_vector_adjustment = vp5_parse_vector_adjustment;
275  s->parse_coeff = vp5_parse_coeff;
276  s->default_models_init = vp5_default_models_init;
277  s->parse_vector_models = vp5_parse_vector_models;
278  s->parse_coeff_models = vp5_parse_coeff_models;
279  s->parse_header = vp5_parse_header;
280 
281  return 0;
282 }
283 
284  AVCodec ff_vp5_decoder = {
285  .name = "vp5",
286  .long_name = NULL_IF_CONFIG_SMALL("On2 VP5"),
287  .type = AVMEDIA_TYPE_VIDEO,
288  .id = AV_CODEC_ID_VP5,
289  .priv_data_size = sizeof(VP56Context),
290  .init = vp5_decode_init,
291  .close = ff_vp56_free,
292  .decode = ff_vp56_decode_frame,
293  .capabilities = AV_CODEC_CAP_DR1,
294 };
ff_vp56_free
av_cold int ff_vp56_free(AVCodecContext *avctx)
Definition: vp56.c:743
VP56Model::coeff_ract
uint8_t coeff_ract[2][3][6][11]
Definition: vp56.h:113
s
const char * s
Definition: avisynth_c.h:631
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
vp56.h
VP5 and VP6 compatible video decoder (common features)
vp5_decode_init
static av_cold int vp5_decode_init(AVCodecContext *avctx)
Definition: vp5.c:266
ctx
AVFormatContext * ctx
Definition: movenc-test.c:48
ff_set_dimensions
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:209
ff_vp56_coeff_bias
const uint8_t ff_vp56_coeff_bias[]
Definition: vp56data.c:67
VP56Model::coeff_dccv
uint8_t coeff_dccv[2][11]
Definition: vp56.h:112
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
VP56Model::mb_types_stats
uint8_t mb_types_stats[3][10][2]
Definition: vp56.h:118
vp5_parse_header
static int vp5_parse_header(VP56Context *s, const uint8_t *buf, int buf_size)
Definition: vp5.c:38
VP56Model::vector_sig
uint8_t vector_sig[2]
Definition: vp56.h:107
b
const char * b
Definition: vf_curves.c:109
vp5_coord_div
static const uint8_t vp5_coord_div[]
Definition: vp5data.h:175
vp5_parse_coeff_models
static int vp5_parse_coeff_models(VP56Context *s)
Definition: vp5.c:127
VP56_SIZE_CHANGE
#define VP56_SIZE_CHANGE
Definition: vp56.h:70
vp5data.h
VP5 compatible video decoder.
vp5_parse_vector_adjustment
static void vp5_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
Definition: vp5.c:80
ff_vp56_init
av_cold int ff_vp56_init(AVCodecContext *avctx, int flip, int has_alpha)
Definition: vp56.c:683
AVCodec
AVCodec.
Definition: avcodec.h:3392
vp5_ract_pct
static const uint8_t vp5_ract_pct[3][2][6][11]
Definition: vp5data.h:52
VP56mv::y
int16_t y
Definition: vp56.h:67
uint8_t
uint8_t
Definition: audio_convert.c:194
av_cold
#define av_cold
Definition: attributes.h:82
delta
float delta
Definition: vorbis_enc_data.h:457
pt
int pt
Definition: rtp.c:35
permute
static void permute(int16_t dst[64], const int16_t src[64], enum idct_permutation_type perm_type)
Definition: dct-test.c:145
get_bits.h
bitstream reader API header.
vp56_rac_get_tree
static av_always_inline int vp56_rac_get_tree(VP56RangeCoder *c, const VP56Tree *tree, const uint8_t *probs)
Definition: vp56.h:361
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
vp5_dccv_pct
static const uint8_t vp5_dccv_pct[2][11]
Definition: vp5data.h:47
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
vp5_parse_vector_models
static void vp5_parse_vector_models(VP56Context *s)
Definition: vp5.c:104
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
vp56_rac_get
static av_always_inline int vp56_rac_get(VP56RangeCoder *c)
Definition: vp56.h:285
AVCodec::name
const char * name
Name of the codec implementation.
Definition: avcodec.h:3399
ff_vp56_init_dequant
void ff_vp56_init_dequant(VP56Context *s, int quantizer)
Definition: vp56.c:34
ff_vp56_b6to4
const uint8_t ff_vp56_b6to4[]
Definition: vp56data.c:29
ff_vp5_decoder
AVCodec ff_vp5_decoder
Definition: vp5.c:284
vp56data.h
VP5 and VP6 compatible video decoder (common data)
vp56_rac_gets_nn
static av_unused int vp56_rac_gets_nn(VP56RangeCoder *c, int bits)
Definition: vp56.h:348
FFMIN
#define FFMIN(a, b)
Definition: common.h:96
VP56Model::vector_pdi
uint8_t vector_pdi[2][2]
Definition: vp56.h:109
vp5_ract_lc
static const int16_t vp5_ract_lc[3][3][5][6][2]
Definition: vp5data.h:124
ff_vp56_decode_frame
int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: vp56.c:499
ff_vp56_coeff_bit_length
const uint8_t ff_vp56_coeff_bit_length[]
Definition: vp56data.c:68
vp56_rac_get_prob
#define vp56_rac_get_prob
Definition: vp56.h:250
AV_CODEC_ID_VP5
Definition: avcodec.h:197
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
vp5_dccv_lc
static const int16_t vp5_dccv_lc[5][36][2]
Definition: vp5data.h:91
vp56_rac_get_prob_branchy
static av_always_inline int vp56_rac_get_prob_branchy(VP56RangeCoder *c, int prob)
Definition: vp56.h:267
avcodec.h
Libavcodec external API header.
ff_vp56_pc_tree
const VP56Tree ff_vp56_pc_tree[]
Definition: vp56data.c:59
AVCodecContext
main external API structure.
Definition: avcodec.h:1532
buf
void * buf
Definition: avisynth_c.h:553
ff_vp56_coeff_parse_table
const uint8_t ff_vp56_coeff_parse_table[6][11]
Definition: vp56data.c:31
VP56Model::coeff_dcct
uint8_t coeff_dcct[2][36][5]
Definition: vp56.h:115
ff_vp56_init_range_decoder
void ff_vp56_init_range_decoder(VP56RangeCoder *c, const uint8_t *buf, int buf_size)
Definition: vp56rac.c:40
VP56Model::coeff_acct
uint8_t coeff_acct[2][3][3][6][5]
Definition: vp56.h:114
VP56mv
Definition: vp56.h:65
vp5_vmc_pct
static const uint8_t vp5_vmc_pct[2][11]
Definition: vp5data.h:42
decode
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:572
ff_vp56_pva_tree
const VP56Tree ff_vp56_pva_tree[]
Definition: vp56data.c:49
vp5_parse_coeff
static void vp5_parse_coeff(VP56Context *s)
Definition: vp5.c:174
VP56mv::x
int16_t x
Definition: vp56.h:66
internal.h
common internal api header.
vp5_default_models_init
static void vp5_default_models_init(VP56Context *s)
Definition: vp5.c:251
c
static double c[64]
Definition: vsrc_mptestsrc.c:87
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:1574
VP56Model::vector_pdv
uint8_t vector_pdv[2][7]
Definition: vp56.h:110
coeff
static const double coeff[2][5]
Definition: vf_owdenoise.c:71
comp
static void comp(unsigned char *dst, int dst_stride, unsigned char *src, int src_stride, int add)
Definition: eamad.c:83
vp5_coeff_groups
static const uint8_t vp5_coeff_groups[]
Definition: vp5data.h:31
AVMEDIA_TYPE_VIDEO
Definition: avutil.h:193
VP56Model
Definition: vp56.h:104
ff_vp56_def_mb_types_stats
const uint8_t ff_vp56_def_mb_types_stats[3][10][2]
Definition: vp56data.c:40
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:856
VP56Model::vector_dct
uint8_t vector_dct[2]
Definition: vp56.h:108
vp56_rac_gets
static int vp56_rac_gets(VP56RangeCoder *c, int bits)
Definition: vp56.h:309
Generated on Mon Feb 15 2016 15:20:43 for FFmpeg by   doxygen 1.8.6

AltStyle によって変換されたページ (->オリジナル) /