FFmpeg
rv10.c
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1 /*
2  * RV10/RV20 decoder
3  * Copyright (c) 2000,2001 Fabrice Bellard
4  * Copyright (c) 2002-2004 Michael Niedermayer
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * FFmpeg is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 /**
24  * @file
25  * RV10/RV20 decoder
26  */
27 
28 #include <inttypes.h>
29 
30 #include "libavutil/imgutils.h"
31 
32 #include "avcodec.h"
33 #include "error_resilience.h"
34 #include "h263.h"
35 #include "h263data.h"
36 #include "internal.h"
37 #include "mpeg_er.h"
38 #include "mpegutils.h"
39 #include "mpegvideo.h"
40 #include "mpeg4video.h"
41 #include "mpegvideodata.h"
42 #include "rv10.h"
43 
44 #define RV_GET_MAJOR_VER(x) ((x) >> 28)
45 #define RV_GET_MINOR_VER(x) (((x) >> 20) & 0xFF)
46 #define RV_GET_MICRO_VER(x) (((x) >> 12) & 0xFF)
47 
48 #define DC_VLC_BITS 14 // FIXME find a better solution
49 
50 typedef struct RVDecContext {
52  int sub_id;
54 } RVDecContext;
55 
56 static const uint16_t rv_lum_code[256] = {
57  0x3e7f, 0x0f00, 0x0f01, 0x0f02, 0x0f03, 0x0f04, 0x0f05, 0x0f06,
58  0x0f07, 0x0f08, 0x0f09, 0x0f0a, 0x0f0b, 0x0f0c, 0x0f0d, 0x0f0e,
59  0x0f0f, 0x0f10, 0x0f11, 0x0f12, 0x0f13, 0x0f14, 0x0f15, 0x0f16,
60  0x0f17, 0x0f18, 0x0f19, 0x0f1a, 0x0f1b, 0x0f1c, 0x0f1d, 0x0f1e,
61  0x0f1f, 0x0f20, 0x0f21, 0x0f22, 0x0f23, 0x0f24, 0x0f25, 0x0f26,
62  0x0f27, 0x0f28, 0x0f29, 0x0f2a, 0x0f2b, 0x0f2c, 0x0f2d, 0x0f2e,
63  0x0f2f, 0x0f30, 0x0f31, 0x0f32, 0x0f33, 0x0f34, 0x0f35, 0x0f36,
64  0x0f37, 0x0f38, 0x0f39, 0x0f3a, 0x0f3b, 0x0f3c, 0x0f3d, 0x0f3e,
65  0x0f3f, 0x0380, 0x0381, 0x0382, 0x0383, 0x0384, 0x0385, 0x0386,
66  0x0387, 0x0388, 0x0389, 0x038a, 0x038b, 0x038c, 0x038d, 0x038e,
67  0x038f, 0x0390, 0x0391, 0x0392, 0x0393, 0x0394, 0x0395, 0x0396,
68  0x0397, 0x0398, 0x0399, 0x039a, 0x039b, 0x039c, 0x039d, 0x039e,
69  0x039f, 0x00c0, 0x00c1, 0x00c2, 0x00c3, 0x00c4, 0x00c5, 0x00c6,
70  0x00c7, 0x00c8, 0x00c9, 0x00ca, 0x00cb, 0x00cc, 0x00cd, 0x00ce,
71  0x00cf, 0x0050, 0x0051, 0x0052, 0x0053, 0x0054, 0x0055, 0x0056,
72  0x0057, 0x0020, 0x0021, 0x0022, 0x0023, 0x000c, 0x000d, 0x0004,
73  0x0000, 0x0005, 0x000e, 0x000f, 0x0024, 0x0025, 0x0026, 0x0027,
74  0x0058, 0x0059, 0x005a, 0x005b, 0x005c, 0x005d, 0x005e, 0x005f,
75  0x00d0, 0x00d1, 0x00d2, 0x00d3, 0x00d4, 0x00d5, 0x00d6, 0x00d7,
76  0x00d8, 0x00d9, 0x00da, 0x00db, 0x00dc, 0x00dd, 0x00de, 0x00df,
77  0x03a0, 0x03a1, 0x03a2, 0x03a3, 0x03a4, 0x03a5, 0x03a6, 0x03a7,
78  0x03a8, 0x03a9, 0x03aa, 0x03ab, 0x03ac, 0x03ad, 0x03ae, 0x03af,
79  0x03b0, 0x03b1, 0x03b2, 0x03b3, 0x03b4, 0x03b5, 0x03b6, 0x03b7,
80  0x03b8, 0x03b9, 0x03ba, 0x03bb, 0x03bc, 0x03bd, 0x03be, 0x03bf,
81  0x0f40, 0x0f41, 0x0f42, 0x0f43, 0x0f44, 0x0f45, 0x0f46, 0x0f47,
82  0x0f48, 0x0f49, 0x0f4a, 0x0f4b, 0x0f4c, 0x0f4d, 0x0f4e, 0x0f4f,
83  0x0f50, 0x0f51, 0x0f52, 0x0f53, 0x0f54, 0x0f55, 0x0f56, 0x0f57,
84  0x0f58, 0x0f59, 0x0f5a, 0x0f5b, 0x0f5c, 0x0f5d, 0x0f5e, 0x0f5f,
85  0x0f60, 0x0f61, 0x0f62, 0x0f63, 0x0f64, 0x0f65, 0x0f66, 0x0f67,
86  0x0f68, 0x0f69, 0x0f6a, 0x0f6b, 0x0f6c, 0x0f6d, 0x0f6e, 0x0f6f,
87  0x0f70, 0x0f71, 0x0f72, 0x0f73, 0x0f74, 0x0f75, 0x0f76, 0x0f77,
88  0x0f78, 0x0f79, 0x0f7a, 0x0f7b, 0x0f7c, 0x0f7d, 0x0f7e, 0x0f7f,
89 };
90 
91 static const uint8_t rv_lum_bits[256] = {
92  14, 12, 12, 12, 12, 12, 12, 12,
93  12, 12, 12, 12, 12, 12, 12, 12,
94  12, 12, 12, 12, 12, 12, 12, 12,
95  12, 12, 12, 12, 12, 12, 12, 12,
96  12, 12, 12, 12, 12, 12, 12, 12,
97  12, 12, 12, 12, 12, 12, 12, 12,
98  12, 12, 12, 12, 12, 12, 12, 12,
99  12, 12, 12, 12, 12, 12, 12, 12,
100  12, 10, 10, 10, 10, 10, 10, 10,
101  10, 10, 10, 10, 10, 10, 10, 10,
102  10, 10, 10, 10, 10, 10, 10, 10,
103  10, 10, 10, 10, 10, 10, 10, 10,
104  10, 8, 8, 8, 8, 8, 8, 8,
105  8, 8, 8, 8, 8, 8, 8, 8,
106  8, 7, 7, 7, 7, 7, 7, 7,
107  7, 6, 6, 6, 6, 5, 5, 4,
108  2, 4, 5, 5, 6, 6, 6, 6,
109  7, 7, 7, 7, 7, 7, 7, 7,
110  8, 8, 8, 8, 8, 8, 8, 8,
111  8, 8, 8, 8, 8, 8, 8, 8,
112  10, 10, 10, 10, 10, 10, 10, 10,
113  10, 10, 10, 10, 10, 10, 10, 10,
114  10, 10, 10, 10, 10, 10, 10, 10,
115  10, 10, 10, 10, 10, 10, 10, 10,
116  12, 12, 12, 12, 12, 12, 12, 12,
117  12, 12, 12, 12, 12, 12, 12, 12,
118  12, 12, 12, 12, 12, 12, 12, 12,
119  12, 12, 12, 12, 12, 12, 12, 12,
120  12, 12, 12, 12, 12, 12, 12, 12,
121  12, 12, 12, 12, 12, 12, 12, 12,
122  12, 12, 12, 12, 12, 12, 12, 12,
123  12, 12, 12, 12, 12, 12, 12, 12,
124 };
125 
126 static const uint16_t rv_chrom_code[256] = {
127  0xfe7f, 0x3f00, 0x3f01, 0x3f02, 0x3f03, 0x3f04, 0x3f05, 0x3f06,
128  0x3f07, 0x3f08, 0x3f09, 0x3f0a, 0x3f0b, 0x3f0c, 0x3f0d, 0x3f0e,
129  0x3f0f, 0x3f10, 0x3f11, 0x3f12, 0x3f13, 0x3f14, 0x3f15, 0x3f16,
130  0x3f17, 0x3f18, 0x3f19, 0x3f1a, 0x3f1b, 0x3f1c, 0x3f1d, 0x3f1e,
131  0x3f1f, 0x3f20, 0x3f21, 0x3f22, 0x3f23, 0x3f24, 0x3f25, 0x3f26,
132  0x3f27, 0x3f28, 0x3f29, 0x3f2a, 0x3f2b, 0x3f2c, 0x3f2d, 0x3f2e,
133  0x3f2f, 0x3f30, 0x3f31, 0x3f32, 0x3f33, 0x3f34, 0x3f35, 0x3f36,
134  0x3f37, 0x3f38, 0x3f39, 0x3f3a, 0x3f3b, 0x3f3c, 0x3f3d, 0x3f3e,
135  0x3f3f, 0x0f80, 0x0f81, 0x0f82, 0x0f83, 0x0f84, 0x0f85, 0x0f86,
136  0x0f87, 0x0f88, 0x0f89, 0x0f8a, 0x0f8b, 0x0f8c, 0x0f8d, 0x0f8e,
137  0x0f8f, 0x0f90, 0x0f91, 0x0f92, 0x0f93, 0x0f94, 0x0f95, 0x0f96,
138  0x0f97, 0x0f98, 0x0f99, 0x0f9a, 0x0f9b, 0x0f9c, 0x0f9d, 0x0f9e,
139  0x0f9f, 0x03c0, 0x03c1, 0x03c2, 0x03c3, 0x03c4, 0x03c5, 0x03c6,
140  0x03c7, 0x03c8, 0x03c9, 0x03ca, 0x03cb, 0x03cc, 0x03cd, 0x03ce,
141  0x03cf, 0x00e0, 0x00e1, 0x00e2, 0x00e3, 0x00e4, 0x00e5, 0x00e6,
142  0x00e7, 0x0030, 0x0031, 0x0032, 0x0033, 0x0008, 0x0009, 0x0002,
143  0x0000, 0x0003, 0x000a, 0x000b, 0x0034, 0x0035, 0x0036, 0x0037,
144  0x00e8, 0x00e9, 0x00ea, 0x00eb, 0x00ec, 0x00ed, 0x00ee, 0x00ef,
145  0x03d0, 0x03d1, 0x03d2, 0x03d3, 0x03d4, 0x03d5, 0x03d6, 0x03d7,
146  0x03d8, 0x03d9, 0x03da, 0x03db, 0x03dc, 0x03dd, 0x03de, 0x03df,
147  0x0fa0, 0x0fa1, 0x0fa2, 0x0fa3, 0x0fa4, 0x0fa5, 0x0fa6, 0x0fa7,
148  0x0fa8, 0x0fa9, 0x0faa, 0x0fab, 0x0fac, 0x0fad, 0x0fae, 0x0faf,
149  0x0fb0, 0x0fb1, 0x0fb2, 0x0fb3, 0x0fb4, 0x0fb5, 0x0fb6, 0x0fb7,
150  0x0fb8, 0x0fb9, 0x0fba, 0x0fbb, 0x0fbc, 0x0fbd, 0x0fbe, 0x0fbf,
151  0x3f40, 0x3f41, 0x3f42, 0x3f43, 0x3f44, 0x3f45, 0x3f46, 0x3f47,
152  0x3f48, 0x3f49, 0x3f4a, 0x3f4b, 0x3f4c, 0x3f4d, 0x3f4e, 0x3f4f,
153  0x3f50, 0x3f51, 0x3f52, 0x3f53, 0x3f54, 0x3f55, 0x3f56, 0x3f57,
154  0x3f58, 0x3f59, 0x3f5a, 0x3f5b, 0x3f5c, 0x3f5d, 0x3f5e, 0x3f5f,
155  0x3f60, 0x3f61, 0x3f62, 0x3f63, 0x3f64, 0x3f65, 0x3f66, 0x3f67,
156  0x3f68, 0x3f69, 0x3f6a, 0x3f6b, 0x3f6c, 0x3f6d, 0x3f6e, 0x3f6f,
157  0x3f70, 0x3f71, 0x3f72, 0x3f73, 0x3f74, 0x3f75, 0x3f76, 0x3f77,
158  0x3f78, 0x3f79, 0x3f7a, 0x3f7b, 0x3f7c, 0x3f7d, 0x3f7e, 0x3f7f,
159 };
160 
161 static const uint8_t rv_chrom_bits[256] = {
162  16, 14, 14, 14, 14, 14, 14, 14,
163  14, 14, 14, 14, 14, 14, 14, 14,
164  14, 14, 14, 14, 14, 14, 14, 14,
165  14, 14, 14, 14, 14, 14, 14, 14,
166  14, 14, 14, 14, 14, 14, 14, 14,
167  14, 14, 14, 14, 14, 14, 14, 14,
168  14, 14, 14, 14, 14, 14, 14, 14,
169  14, 14, 14, 14, 14, 14, 14, 14,
170  14, 12, 12, 12, 12, 12, 12, 12,
171  12, 12, 12, 12, 12, 12, 12, 12,
172  12, 12, 12, 12, 12, 12, 12, 12,
173  12, 12, 12, 12, 12, 12, 12, 12,
174  12, 10, 10, 10, 10, 10, 10, 10,
175  10, 10, 10, 10, 10, 10, 10, 10,
176  10, 8, 8, 8, 8, 8, 8, 8,
177  8, 6, 6, 6, 6, 4, 4, 3,
178  2, 3, 4, 4, 6, 6, 6, 6,
179  8, 8, 8, 8, 8, 8, 8, 8,
180  10, 10, 10, 10, 10, 10, 10, 10,
181  10, 10, 10, 10, 10, 10, 10, 10,
182  12, 12, 12, 12, 12, 12, 12, 12,
183  12, 12, 12, 12, 12, 12, 12, 12,
184  12, 12, 12, 12, 12, 12, 12, 12,
185  12, 12, 12, 12, 12, 12, 12, 12,
186  14, 14, 14, 14, 14, 14, 14, 14,
187  14, 14, 14, 14, 14, 14, 14, 14,
188  14, 14, 14, 14, 14, 14, 14, 14,
189  14, 14, 14, 14, 14, 14, 14, 14,
190  14, 14, 14, 14, 14, 14, 14, 14,
191  14, 14, 14, 14, 14, 14, 14, 14,
192  14, 14, 14, 14, 14, 14, 14, 14,
193  14, 14, 14, 14, 14, 14, 14, 14,
194 };
195 
197 
199 {
200  int code;
201 
202  if (n < 4) {
203  code = get_vlc2(&s->gb, rv_dc_lum.table, DC_VLC_BITS, 2);
204  if (code < 0) {
205  /* XXX: I don't understand why they use LONGER codes than
206  * necessary. The following code would be completely useless
207  * if they had thought about it !!! */
208  code = get_bits(&s->gb, 7);
209  if (code == 0x7c) {
210  code = (int8_t) (get_bits(&s->gb, 7) + 1);
211  } else if (code == 0x7d) {
212  code = -128 + get_bits(&s->gb, 7);
213  } else if (code == 0x7e) {
214  if (get_bits1(&s->gb) == 0)
215  code = (int8_t) (get_bits(&s->gb, 8) + 1);
216  else
217  code = (int8_t) (get_bits(&s->gb, 8));
218  } else if (code == 0x7f) {
219  skip_bits(&s->gb, 11);
220  code = 1;
221  }
222  } else {
223  code -= 128;
224  }
225  } else {
227  /* same remark */
228  if (code < 0) {
229  code = get_bits(&s->gb, 9);
230  if (code == 0x1fc) {
231  code = (int8_t) (get_bits(&s->gb, 7) + 1);
232  } else if (code == 0x1fd) {
233  code = -128 + get_bits(&s->gb, 7);
234  } else if (code == 0x1fe) {
235  skip_bits(&s->gb, 9);
236  code = 1;
237  } else {
238  av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n");
239  return 0xffff;
240  }
241  } else {
242  code -= 128;
243  }
244  }
245  return -code;
246 }
247 
248 /* read RV 1.0 compatible frame header */
250 {
251  int mb_count, pb_frame, marker, mb_xy;
252 
253  marker = get_bits1(&s->gb);
254 
255  if (get_bits1(&s->gb))
256  s->pict_type = AV_PICTURE_TYPE_P;
257  else
258  s->pict_type = AV_PICTURE_TYPE_I;
259 
260  if (!marker)
261  av_log(s->avctx, AV_LOG_ERROR, "marker missing\n");
262 
263  pb_frame = get_bits1(&s->gb);
264 
265  ff_dlog(s->avctx, "pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame);
266 
267  if (pb_frame) {
268  avpriv_request_sample(s->avctx, "PB-frame");
269  return AVERROR_PATCHWELCOME;
270  }
271 
272  s->qscale = get_bits(&s->gb, 5);
273  if (s->qscale == 0) {
274  av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
275  return AVERROR_INVALIDDATA;
276  }
277 
278  if (s->pict_type == AV_PICTURE_TYPE_I) {
279  if (s->rv10_version == 3) {
280  /* specific MPEG like DC coding not used */
281  s->last_dc[0] = get_bits(&s->gb, 8);
282  s->last_dc[1] = get_bits(&s->gb, 8);
283  s->last_dc[2] = get_bits(&s->gb, 8);
284  ff_dlog(s->avctx, "DC:%d %d %d\n", s->last_dc[0],
285  s->last_dc[1], s->last_dc[2]);
286  }
287  }
288  /* if multiple packets per frame are sent, the position at which
289  * to display the macroblocks is coded here */
290 
291  mb_xy = s->mb_x + s->mb_y * s->mb_width;
292  if (show_bits(&s->gb, 12) == 0 || (mb_xy && mb_xy < s->mb_num)) {
293  s->mb_x = get_bits(&s->gb, 6); /* mb_x */
294  s->mb_y = get_bits(&s->gb, 6); /* mb_y */
295  mb_count = get_bits(&s->gb, 12);
296  } else {
297  s->mb_x = 0;
298  s->mb_y = 0;
299  mb_count = s->mb_width * s->mb_height;
300  }
301  skip_bits(&s->gb, 3); /* ignored */
302  s->f_code = 1;
303  s->unrestricted_mv = 1;
304 
305  return mb_count;
306 }
307 
309 {
310  MpegEncContext *s = &rv->m;
311  int seq, mb_pos, i, ret;
312  int rpr_max;
313 
314  i = get_bits(&s->gb, 2);
315  switch (i) {
316  case 0:
317  s->pict_type = AV_PICTURE_TYPE_I;
318  break;
319  case 1:
320  s->pict_type = AV_PICTURE_TYPE_I;
321  break; // hmm ...
322  case 2:
323  s->pict_type = AV_PICTURE_TYPE_P;
324  break;
325  case 3:
326  s->pict_type = AV_PICTURE_TYPE_B;
327  break;
328  default:
329  av_log(s->avctx, AV_LOG_ERROR, "unknown frame type\n");
330  return AVERROR_INVALIDDATA;
331  }
332 
333  if (s->low_delay && s->pict_type == AV_PICTURE_TYPE_B) {
334  av_log(s->avctx, AV_LOG_ERROR, "low delay B\n");
335  return -1;
336  }
337  if (!s->last_picture_ptr && s->pict_type == AV_PICTURE_TYPE_B) {
338  av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");
339  return AVERROR_INVALIDDATA;
340  }
341 
342  if (get_bits1(&s->gb)) {
343  av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n");
344  return AVERROR_INVALIDDATA;
345  }
346 
347  s->qscale = get_bits(&s->gb, 5);
348  if (s->qscale == 0) {
349  av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
350  return AVERROR_INVALIDDATA;
351  }
352 
353  if (RV_GET_MINOR_VER(rv->sub_id) >= 2)
354  s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres;
355 
356  if (RV_GET_MINOR_VER(rv->sub_id) <= 1)
357  seq = get_bits(&s->gb, 8) << 7;
358  else
359  seq = get_bits(&s->gb, 13) << 2;
360 
361  rpr_max = s->avctx->extradata[1] & 7;
362  if (rpr_max) {
363  int f, new_w, new_h;
364  int rpr_bits = av_log2(rpr_max) + 1;
365 
366  f = get_bits(&s->gb, rpr_bits);
367 
368  if (f) {
369  if (s->avctx->extradata_size < 8 + 2 * f) {
370  av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n");
371  return AVERROR_INVALIDDATA;
372  }
373 
374  new_w = 4 * ((uint8_t *) s->avctx->extradata)[6 + 2 * f];
375  new_h = 4 * ((uint8_t *) s->avctx->extradata)[7 + 2 * f];
376  } else {
377  new_w = rv->orig_width;
378  new_h = rv->orig_height;
379  }
380  if (new_w != s->width || new_h != s->height) {
381  AVRational old_aspect = s->avctx->sample_aspect_ratio;
382  av_log(s->avctx, AV_LOG_DEBUG,
383  "attempting to change resolution to %dx%d\n", new_w, new_h);
384  if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0)
385  return AVERROR_INVALIDDATA;
387 
388  // attempt to keep aspect during typical resolution switches
389  if (!old_aspect.num)
390  old_aspect = (AVRational){1, 1};
391  if (2 * (int64_t)new_w * s->height == (int64_t)new_h * s->width)
392  s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1});
393  if ((int64_t)new_w * s->height == 2 * (int64_t)new_h * s->width)
394  s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2});
395 
396  ret = ff_set_dimensions(s->avctx, new_w, new_h);
397  if (ret < 0)
398  return ret;
399 
400  s->width = new_w;
401  s->height = new_h;
402  if ((ret = ff_mpv_common_init(s)) < 0)
403  return ret;
404  }
405 
406  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
407  av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d/%d\n", f, rpr_bits, rpr_max);
408  }
409  }
410  if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)
411  return AVERROR_INVALIDDATA;
412 
413  mb_pos = ff_h263_decode_mba(s);
414 
415  seq |= s->time & ~0x7FFF;
416  if (seq - s->time > 0x4000)
417  seq -= 0x8000;
418  if (seq - s->time < -0x4000)
419  seq += 0x8000;
420 
421  if (seq != s->time) {
422  if (s->pict_type != AV_PICTURE_TYPE_B) {
423  s->time = seq;
424  s->pp_time = s->time - s->last_non_b_time;
425  s->last_non_b_time = s->time;
426  } else {
427  s->time = seq;
428  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
429  }
430  }
431  if (s->pict_type == AV_PICTURE_TYPE_B) {
432  if (s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0) {
433  av_log(s->avctx, AV_LOG_DEBUG,
434  "messed up order, possible from seeking? skipping current B-frame\n");
435 #define ERROR_SKIP_FRAME -123
436  return ERROR_SKIP_FRAME;
437  }
439  }
440 
441  s->no_rounding = get_bits1(&s->gb);
442 
443  if (RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B)
444  // binary decoder reads 3+2 bits here but they don't seem to be used
445  skip_bits(&s->gb, 5);
446 
447  s->f_code = 1;
448  s->unrestricted_mv = 1;
449  s->h263_aic = s->pict_type == AV_PICTURE_TYPE_I;
450  s->modified_quant = 1;
451  if (!s->avctx->lowres)
452  s->loop_filter = 1;
453 
454  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
455  av_log(s->avctx, AV_LOG_INFO,
456  "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",
457  seq, s->mb_x, s->mb_y, s->pict_type, s->qscale,
458  s->no_rounding);
459  }
460 
461  av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);
462 
463  return s->mb_width * s->mb_height - mb_pos;
464 }
465 
467 {
468  RVDecContext *rv = avctx->priv_data;
469  MpegEncContext *s = &rv->m;
470  static int done = 0;
471  int major_ver, minor_ver, micro_ver, ret;
472 
473  if (avctx->extradata_size < 8) {
474  av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
475  return AVERROR_INVALIDDATA;
476  }
477  if ((ret = av_image_check_size(avctx->coded_width,
478  avctx->coded_height, 0, avctx)) < 0)
479  return ret;
480 
482  ff_mpv_decode_init(s, avctx);
483 
484  s->out_format = FMT_H263;
485 
486  rv->orig_width =
487  s->width = avctx->coded_width;
488  rv->orig_height =
489  s->height = avctx->coded_height;
490 
491  s->h263_long_vectors = ((uint8_t *) avctx->extradata)[3] & 1;
492  rv->sub_id = AV_RB32((uint8_t *) avctx->extradata + 4);
493 
494  major_ver = RV_GET_MAJOR_VER(rv->sub_id);
495  minor_ver = RV_GET_MINOR_VER(rv->sub_id);
496  micro_ver = RV_GET_MICRO_VER(rv->sub_id);
497 
498  s->low_delay = 1;
499  switch (major_ver) {
500  case 1:
501  s->rv10_version = micro_ver ? 3 : 1;
502  s->obmc = micro_ver == 2;
503  break;
504  case 2:
505  if (minor_ver >= 2) {
506  s->low_delay = 0;
507  s->avctx->has_b_frames = 1;
508  }
509  break;
510  default:
511  av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id);
512  avpriv_request_sample(avctx, "RV1/2 version");
513  return AVERROR_PATCHWELCOME;
514  }
515 
516  if (avctx->debug & FF_DEBUG_PICT_INFO) {
517  av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%"PRIX32"\n", rv->sub_id,
518  ((uint32_t *) avctx->extradata)[0]);
519  }
520 
521  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
522 
524  if ((ret = ff_mpv_common_init(s)) < 0)
525  return ret;
526 
527  ff_h263dsp_init(&s->h263dsp);
529 
530  /* init rv vlc */
531  if (!done) {
533  rv_lum_bits, 1, 1,
534  rv_lum_code, 2, 2, 16384);
536  rv_chrom_bits, 1, 1,
537  rv_chrom_code, 2, 2, 16388);
538  done = 1;
539  }
540 
541  return 0;
542 }
543 
545 {
546  MpegEncContext *s = avctx->priv_data;
547 
549  return 0;
550 }
551 
552 static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,
553  int buf_size, int buf_size2)
554 {
555  RVDecContext *rv = avctx->priv_data;
556  MpegEncContext *s = &rv->m;
557  int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret;
558 
559  active_bits_size = buf_size * 8;
560  init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8);
561  if (s->codec_id == AV_CODEC_ID_RV10)
562  mb_count = rv10_decode_picture_header(s);
563  else
564  mb_count = rv20_decode_picture_header(rv);
565  if (mb_count < 0) {
566  if (mb_count != ERROR_SKIP_FRAME)
567  av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");
568  return AVERROR_INVALIDDATA;
569  }
570 
571  if (s->mb_x >= s->mb_width ||
572  s->mb_y >= s->mb_height) {
573  av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);
574  return AVERROR_INVALIDDATA;
575  }
576  mb_pos = s->mb_y * s->mb_width + s->mb_x;
577  left = s->mb_width * s->mb_height - mb_pos;
578  if (mb_count > left) {
579  av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");
580  return AVERROR_INVALIDDATA;
581  }
582 
583  if ((s->mb_x == 0 && s->mb_y == 0) || !s->current_picture_ptr) {
584  // FIXME write parser so we always have complete frames?
585  if (s->current_picture_ptr) {
586  ff_er_frame_end(&s->er);
588  s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;
589  }
590  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
591  return ret;
593  } else {
594  if (s->current_picture_ptr->f->pict_type != s->pict_type) {
595  av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");
596  return AVERROR_INVALIDDATA;
597  }
598  }
599 
600 
601  ff_dlog(avctx, "qscale=%d\n", s->qscale);
602 
603  /* default quantization values */
604  if (s->codec_id == AV_CODEC_ID_RV10) {
605  if (s->mb_y == 0)
606  s->first_slice_line = 1;
607  } else {
608  s->first_slice_line = 1;
609  s->resync_mb_x = s->mb_x;
610  }
611  start_mb_x = s->mb_x;
612  s->resync_mb_y = s->mb_y;
613  if (s->h263_aic) {
614  s->y_dc_scale_table =
615  s->c_dc_scale_table = ff_aic_dc_scale_table;
616  } else {
617  s->y_dc_scale_table =
618  s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
619  }
620 
621  if (s->modified_quant)
622  s->chroma_qscale_table = ff_h263_chroma_qscale_table;
623 
624  ff_set_qscale(s, s->qscale);
625 
626  s->rv10_first_dc_coded[0] = 0;
627  s->rv10_first_dc_coded[1] = 0;
628  s->rv10_first_dc_coded[2] = 0;
629  s->block_wrap[0] =
630  s->block_wrap[1] =
631  s->block_wrap[2] =
632  s->block_wrap[3] = s->b8_stride;
633  s->block_wrap[4] =
634  s->block_wrap[5] = s->mb_stride;
636 
637  /* decode each macroblock */
638  for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) {
639  int ret;
641  ff_tlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);
642 
643  s->mv_dir = MV_DIR_FORWARD;
644  s->mv_type = MV_TYPE_16X16;
645  ret = ff_h263_decode_mb(s, s->block);
646 
647  // Repeat the slice end check from ff_h263_decode_mb with our active
648  // bitstream size
649  if (ret != SLICE_ERROR && active_bits_size >= get_bits_count(&s->gb)) {
650  int v = show_bits(&s->gb, 16);
651 
652  if (get_bits_count(&s->gb) + 16 > active_bits_size)
653  v >>= get_bits_count(&s->gb) + 16 - active_bits_size;
654 
655  if (!v)
656  ret = SLICE_END;
657  }
658  if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) &&
659  8 * buf_size2 >= get_bits_count(&s->gb)) {
660  active_bits_size = buf_size2 * 8;
661  av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n",
662  8 * buf_size, active_bits_size);
663  ret = SLICE_OK;
664  }
665 
666  if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) {
667  av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x,
668  s->mb_y);
669  return AVERROR_INVALIDDATA;
670  }
671  if (s->pict_type != AV_PICTURE_TYPE_B)
673  ff_mpv_reconstruct_mb(s, s->block);
674  if (s->loop_filter)
676 
677  if (++s->mb_x == s->mb_width) {
678  s->mb_x = 0;
679  s->mb_y++;
681  }
682  if (s->mb_x == s->resync_mb_x)
683  s->first_slice_line = 0;
684  if (ret == SLICE_END)
685  break;
686  }
687 
688  ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y,
689  ER_MB_END);
690 
691  return active_bits_size;
692 }
693 
694 static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
695 {
696  if (avctx->slice_count)
697  return avctx->slice_offset[n];
698  else
699  return AV_RL32(buf + n * 8);
700 }
701 
702 static int rv10_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
703  AVPacket *avpkt)
704 {
705  const uint8_t *buf = avpkt->data;
706  int buf_size = avpkt->size;
707  MpegEncContext *s = avctx->priv_data;
708  AVFrame *pict = data;
709  int i, ret;
710  int slice_count;
711  const uint8_t *slices_hdr = NULL;
712 
713  ff_dlog(avctx, "*****frame %d size=%d\n", avctx->frame_number, buf_size);
714 
715  /* no supplementary picture */
716  if (buf_size == 0) {
717  return 0;
718  }
719 
720  if (!avctx->slice_count) {
721  slice_count = (*buf++) + 1;
722  buf_size--;
723 
724  if (!slice_count || buf_size <= 8 * slice_count) {
725  av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n",
726  slice_count);
727  return AVERROR_INVALIDDATA;
728  }
729 
730  slices_hdr = buf + 4;
731  buf += 8 * slice_count;
732  buf_size -= 8 * slice_count;
733  } else
734  slice_count = avctx->slice_count;
735 
736  for (i = 0; i < slice_count; i++) {
737  unsigned offset = get_slice_offset(avctx, slices_hdr, i);
738  int size, size2;
739 
740  if (offset >= buf_size)
741  return AVERROR_INVALIDDATA;
742 
743  if (i + 1 == slice_count)
744  size = buf_size - offset;
745  else
746  size = get_slice_offset(avctx, slices_hdr, i + 1) - offset;
747 
748  if (i + 2 >= slice_count)
749  size2 = buf_size - offset;
750  else
751  size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset;
752 
753  if (size <= 0 || size2 <= 0 ||
754  offset + FFMAX(size, size2) > buf_size)
755  return AVERROR_INVALIDDATA;
756 
757  if ((ret = rv10_decode_packet(avctx, buf + offset, size, size2)) < 0)
758  return ret;
759 
760  if (ret > 8 * size)
761  i++;
762  }
763 
764  if (s->current_picture_ptr && s->mb_y >= s->mb_height) {
765  ff_er_frame_end(&s->er);
767 
768  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
769  if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
770  return ret;
771  ff_print_debug_info(s, s->current_picture_ptr, pict);
772  ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
773  } else if (s->last_picture_ptr) {
774  if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
775  return ret;
776  ff_print_debug_info(s, s->last_picture_ptr, pict);
777  ff_mpv_export_qp_table(s, pict,s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
778  }
779 
780  if (s->last_picture_ptr || s->low_delay) {
781  *got_frame = 1;
782  }
783 
784  // so we can detect if frame_end was not called (find some nicer solution...)
785  s->current_picture_ptr = NULL;
786  }
787 
788  return avpkt->size;
789 }
790 
792  .name = "rv10",
793  .long_name = NULL_IF_CONFIG_SMALL("RealVideo 1.0"),
794  .type = AVMEDIA_TYPE_VIDEO,
795  .id = AV_CODEC_ID_RV10,
796  .priv_data_size = sizeof(RVDecContext),
798  .close = rv10_decode_end,
800  .capabilities = AV_CODEC_CAP_DR1,
801  .max_lowres = 3,
802  .pix_fmts = (const enum AVPixelFormat[]) {
805  },
806 };
807 
809  .name = "rv20",
810  .long_name = NULL_IF_CONFIG_SMALL("RealVideo 2.0"),
811  .type = AVMEDIA_TYPE_VIDEO,
812  .id = AV_CODEC_ID_RV20,
813  .priv_data_size = sizeof(RVDecContext),
815  .close = rv10_decode_end,
817  .capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
818  .flush = ff_mpeg_flush,
819  .max_lowres = 3,
820  .pix_fmts = (const enum AVPixelFormat[]) {
823  },
824 };
ff_mpv_common_init
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:894
AVCodec
AVCodec.
Definition: avcodec.h:3481
MV_TYPE_16X16
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:266
h263data.h
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
rv_lum_bits
static const uint8_t rv_lum_bits[256]
Definition: rv10.c:91
RV_GET_MINOR_VER
#define RV_GET_MINOR_VER(x)
Definition: rv10.c:45
n
int n
Definition: avisynth_c.h:760
ff_mpeg1_dc_scale_table
const uint8_t ff_mpeg1_dc_scale_table[128]
Definition: mpegvideodata.c:34
INIT_VLC_STATIC
#define INIT_VLC_STATIC(vlc, bits, a, b, c, d, e, f, g, static_size)
Definition: vlc.h:75
ff_rv10_decoder
AVCodec ff_rv10_decoder
Definition: rv10.c:791
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:219
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
AVCodecContext::slice_offset
int * slice_offset
slice offsets in the frame in bytes
Definition: avcodec.h:1935
rv20_decode_picture_header
static int rv20_decode_picture_header(RVDecContext *rv)
Definition: rv10.c:308
internal.h
AVPacket::data
uint8_t * data
Definition: avcodec.h:1477
data
const char data[16]
Definition: mxf.c:91
ff_h263_decode_mba
int ff_h263_decode_mba(MpegEncContext *s)
Definition: ituh263dec.c:139
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:797
ff_er_add_slice
void ff_er_add_slice(ERContext *s, int startx, int starty, int endx, int endy, int status)
Add a slice.
Definition: error_resilience.c:830
ff_init_block_index
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:2281
ff_tlog
#define ff_tlog(ctx,...)
Definition: internal.h:75
mpegvideo.h
mpegutils.h
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:659
RVDecContext
Definition: rv10.c:50
FF_DEBUG_PICT_INFO
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:2651
AVCodecContext::slice_count
int slice_count
slice count
Definition: avcodec.h:1919
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:467
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
ff_h263dsp_init
av_cold void ff_h263dsp_init(H263DSPContext *ctx)
Definition: h263dsp.c:117
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:1753
SLICE_END
#define SLICE_END
end marker found
Definition: mpegvideo.h:518
ff_h263_update_motion_val
void ff_h263_update_motion_val(MpegEncContext *s)
Definition: h263.c:42
AVRational::num
int num
Numerator.
Definition: rational.h:59
rv10_decode_end
static av_cold int rv10_decode_end(AVCodecContext *avctx)
Definition: rv10.c:544
ff_h263_decode_init_vlc
void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:108
ff_mpv_common_end
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:1140
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
buf
void * buf
Definition: avisynth_c.h:766
av_cold
#define av_cold
Definition: attributes.h:84
rv10_decode_picture_header
static int rv10_decode_picture_header(MpegEncContext *s)
Definition: rv10.c:249
decode
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:42
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:1667
ff_h263_chroma_qscale_table
const uint8_t ff_h263_chroma_qscale_table[32]
Definition: h263data.c:262
s
#define s(width, name)
Definition: cbs_vp9.c:257
RV_GET_MAJOR_VER
#define RV_GET_MAJOR_VER(x)
Definition: rv10.c:44
ff_mpeg_er_frame_start
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:46
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:275
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:197
rv_dc_chrom
static VLC rv_dc_chrom
Definition: rv10.c:196
AV_PIX_FMT_YUV420P
@ AV_PIX_FMT_YUV420P
planar YUV 4:2:0, 12bpp, (1 Cr & Cb sample per 2x2 Y samples)
Definition: pixfmt.h:66
f
#define f(width, name)
Definition: cbs_vp9.c:255
RVDecContext::orig_height
int orig_height
Definition: rv10.c:53
flush
static void flush(AVCodecContext *avctx)
Definition: aacdec_template.c:500
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:62
RVDecContext::orig_width
int orig_width
Definition: rv10.c:53
ff_mpv_idct_init
av_cold void ff_mpv_idct_init(MpegEncContext *s)
Definition: mpegvideo.c:330
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
ERROR_SKIP_FRAME
#define ERROR_SKIP_FRAME
rv_chrom_code
static const uint16_t rv_chrom_code[256]
Definition: rv10.c:126
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:274
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
ff_set_qscale
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:2345
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:29
rv_dc_lum
static VLC rv_dc_lum
Definition: rv10.c:196
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:981
AVPacket::size
int size
Definition: avcodec.h:1478
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:188
RV_GET_MICRO_VER
#define RV_GET_MICRO_VER(x)
Definition: rv10.c:46
av_frame_ref
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:443
FF_QSCALE_TYPE_MPEG1
#define FF_QSCALE_TYPE_MPEG1
Definition: internal.h:81
FFMAX
#define FFMAX(a, b)
Definition: common.h:94
size
int size
Definition: twinvq_data.h:11134
AV_RB32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_WL32 unsigned int_TMPL AV_WL24 unsigned int_TMPL AV_WL16 uint64_t_TMPL AV_WB64 unsigned int_TMPL AV_RB32
Definition: bytestream.h:92
ff_mpeg_flush
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo.c:2314
RVDecContext::m
MpegEncContext m
Definition: rv10.c:51
mpegvideodata.h
offset
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf offset
Definition: writing_filters.txt:86
ff_mpv_export_qp_table
int ff_mpv_export_qp_table(MpegEncContext *s, AVFrame *f, Picture *p, int qp_type)
Definition: mpegvideo.c:1453
ff_print_debug_info
void ff_print_debug_info(MpegEncContext *s, Picture *p, AVFrame *pict)
Definition: mpegvideo.c:1446
rv10.h
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
ff_rv_decode_dc
int ff_rv_decode_dc(MpegEncContext *s, int n)
Definition: rv10.c:198
ff_update_block_index
static void ff_update_block_index(MpegEncContext *s)
Definition: mpegvideo.h:737
FMT_H263
@ FMT_H263
Definition: mpegutils.h:126
AV_CODEC_ID_RV10
@ AV_CODEC_ID_RV10
Definition: avcodec.h:223
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
code
and forward the test the status of outputs and forward it to the corresponding return FFERROR_NOT_READY If the filters stores internally one or a few frame for some it can consider them to be part of the FIFO and delay acknowledging a status change accordingly Example code
Definition: filter_design.txt:178
AVCodecContext::extradata
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1666
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:446
rv10_decode_packet
static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int buf_size2)
Definition: rv10.c:552
AV_CODEC_ID_RV20
@ AV_CODEC_ID_RV20
Definition: avcodec.h:224
uint8_t
uint8_t
Definition: audio_convert.c:194
AVCodec::name
const char * name
Name of the codec implementation.
Definition: avcodec.h:3488
ff_rv20_decoder
AVCodec ff_rv20_decoder
Definition: rv10.c:808
ff_mpv_decode_defaults
void ff_mpv_decode_defaults(MpegEncContext *s)
Set the given MpegEncContext to defaults for decoding.
Definition: mpegvideo.c:671
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1775
ff_mpv_frame_end
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo.c:1438
avcodec.h
get_slice_offset
static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
Definition: rv10.c:694
ret
ret
Definition: filter_design.txt:187
SLICE_OK
#define SLICE_OK
Definition: mpegvideo.h:516
ff_aic_dc_scale_table
const uint8_t ff_aic_dc_scale_table[32]
Definition: h263data.c:247
ff_mpv_frame_start
int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx)
generic function called after decoding the header and before a frame is decoded.
Definition: mpegvideo.c:1214
ff_h263_loop_filter
void ff_h263_loop_filter(MpegEncContext *s)
Definition: h263.c:135
ff_mpeg4_init_direct_mv
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:71
left
Tag MUST be and< 10hcoeff half pel interpolation filter coefficients, hcoeff[0] are the 2 middle coefficients[1] are the next outer ones and so on, resulting in a filter like:...eff[2], hcoeff[1], hcoeff[0], hcoeff[0], hcoeff[1], hcoeff[2] ... the sign of the coefficients is not explicitly stored but alternates after each coeff and coeff[0] is positive, so ...,+,-,+,-,+,+,-,+,-,+,... hcoeff[0] is not explicitly stored but found by subtracting the sum of all stored coefficients with signs from 32 hcoeff[0]=32 - hcoeff[1] - hcoeff[2] - ... a good choice for hcoeff and htaps is htaps=6 hcoeff={40,-10, 2} an alternative which requires more computations at both encoder and decoder side and may or may not be better is htaps=8 hcoeff={42,-14, 6,-2}ref_frames minimum of the number of available reference frames and max_ref_frames for example the first frame after a key frame always has ref_frames=1spatial_decomposition_type wavelet type 0 is a 9/7 symmetric compact integer wavelet 1 is a 5/3 symmetric compact integer wavelet others are reserved stored as delta from last, last is reset to 0 if always_reset||keyframeqlog quality(logarithmic quantizer scale) stored as delta from last, last is reset to 0 if always_reset||keyframemv_scale stored as delta from last, last is reset to 0 if always_reset||keyframe FIXME check that everything works fine if this changes between framesqbias dequantization bias stored as delta from last, last is reset to 0 if always_reset||keyframeblock_max_depth maximum depth of the block tree stored as delta from last, last is reset to 0 if always_reset||keyframequant_table quantization tableHighlevel bitstream structure:==============================--------------------------------------------|Header|--------------------------------------------|------------------------------------|||Block0||||split?||||yes no||||......... intra?||||:Block01 :yes no||||:Block02 :....... ..........||||:Block03 ::y DC ::ref index:||||:Block04 ::cb DC ::motion x :||||......... :cr DC ::motion y :||||....... ..........|||------------------------------------||------------------------------------|||Block1|||...|--------------------------------------------|------------ ------------ ------------|||Y subbands||Cb subbands||Cr subbands||||--- ---||--- ---||--- ---|||||LL0||HL0||||LL0||HL0||||LL0||HL0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||LH0||HH0||||LH0||HH0||||LH0||HH0|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HL1||LH1||||HL1||LH1||||HL1||LH1|||||--- ---||--- ---||--- ---||||--- ---||--- ---||--- ---|||||HH1||HL2||||HH1||HL2||||HH1||HL2|||||...||...||...|||------------ ------------ ------------|--------------------------------------------Decoding process:=================------------|||Subbands|------------||||------------|Intra DC||||LL0 subband prediction ------------|\ Dequantization ------------------- \||Reference frames|\ IDWT|------- -------|Motion \|||Frame 0||Frame 1||Compensation . OBMC v -------|------- -------|--------------. \------> Frame n output Frame Frame<----------------------------------/|...|------------------- Range Coder:============Binary Range Coder:------------------- The implemented range coder is an adapted version based upon "Range encoding: an algorithm for removing redundancy from a digitised message." by G. N. N. Martin. The symbols encoded by the Snow range coder are bits(0|1). The associated probabilities are not fix but change depending on the symbol mix seen so far. bit seen|new state ---------+----------------------------------------------- 0|256 - state_transition_table[256 - old_state];1|state_transition_table[old_state];state_transition_table={ 0, 0, 0, 0, 0, 0, 0, 0, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 190, 191, 192, 194, 194, 195, 196, 197, 198, 199, 200, 201, 202, 202, 204, 205, 206, 207, 208, 209, 209, 210, 211, 212, 213, 215, 215, 216, 217, 218, 219, 220, 220, 222, 223, 224, 225, 226, 227, 227, 229, 229, 230, 231, 232, 234, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 248, 0, 0, 0, 0, 0, 0, 0};FIXME Range Coding of integers:------------------------- FIXME Neighboring Blocks:===================left and top are set to the respective blocks unless they are outside of the image in which case they are set to the Null block top-left is set to the top left block unless it is outside of the image in which case it is set to the left block if this block has no larger parent block or it is at the left side of its parent block and the top right block is not outside of the image then the top right block is used for top-right else the top-left block is used Null block y, cb, cr are 128 level, ref, mx and my are 0 Motion Vector Prediction:=========================1. the motion vectors of all the neighboring blocks are scaled to compensate for the difference of reference frames scaled_mv=(mv *(256 *(current_reference+1)/(mv.reference+1))+128)> the median of the scaled left
Definition: snow.txt:386
AV_RL32
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:88
AVCodecContext
main external API structure.
Definition: avcodec.h:1565
AV_PICTURE_TYPE_B
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:276
mpeg4video.h
error_resilience.h
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
VLC
Definition: vlc.h:26
ff_mpv_reconstruct_mb
void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo.c:2262
AV_CODEC_CAP_DELAY
#define AV_CODEC_CAP_DELAY
Encoder or decoder requires flushing with NULL input at the end in order to give the complete and cor...
Definition: avcodec.h:1006
av_mul_q
AVRational av_mul_q(AVRational b, AVRational c)
Multiply two rationals.
Definition: rational.c:80
AVCodecContext::debug
int debug
debug
Definition: avcodec.h:2650
rv_chrom_bits
static const uint8_t rv_chrom_bits[256]
Definition: rv10.c:161
AVCodecContext::coded_width
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:1753
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:275
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
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:104
rv10_decode_init
static av_cold int rv10_decode_init(AVCodecContext *avctx)
Definition: rv10.c:466
AVCodecContext::frame_number
int frame_number
Frame counter, set by libavcodec.
Definition: avcodec.h:2256
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:39
ER_MB_END
#define ER_MB_END
Definition: error_resilience.h:39
SLICE_ERROR
#define SLICE_ERROR
Definition: mpegvideo.h:517
MV_DIR_FORWARD
#define MV_DIR_FORWARD
Definition: mpegvideo.h:262
AVPacket
This structure stores compressed data.
Definition: avcodec.h:1454
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:1592
ff_er_frame_end
void ff_er_frame_end(ERContext *s)
Definition: error_resilience.c:900
mpeg_er.h
DC_VLC_BITS
#define DC_VLC_BITS
Definition: rv10.c:48
imgutils.h
rv_lum_code
static const uint16_t rv_lum_code[256]
Definition: rv10.c:56
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
rv10_decode_frame
static int rv10_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: rv10.c:702
ff_h263_decode_mb
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:697
av_image_check_size
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:282
ff_mpv_decode_init
void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
Definition: mpegvideo.c:676
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:81
VLC::table
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
av_log2
int av_log2(unsigned v)
Definition: intmath.c:26
RVDecContext::sub_id
int sub_id
Definition: rv10.c:52
h263.h