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 #include "libavutil/thread.h"
32 
33 #include "avcodec.h"
34 #include "codec_internal.h"
35 #include "decode.h"
36 #include "error_resilience.h"
37 #include "h263.h"
38 #include "h263data.h"
39 #include "h263dec.h"
40 #include "mpeg_er.h"
41 #include "mpegvideo.h"
42 #include "mpegvideodec.h"
43 #include "mpeg4video.h"
44 #include "mpegvideodata.h"
45 #include "rv10dec.h"
46 
47 #define RV_GET_MAJOR_VER(x) ((x) >> 28)
48 #define RV_GET_MINOR_VER(x) (((x) >> 20) & 0xFF)
49 #define RV_GET_MICRO_VER(x) (((x) >> 12) & 0xFF)
50 
51 #define MAX_VLC_ENTRIES 1023 // Note: Does not include the skip entries.
52 #define DC_VLC_BITS 9
53 
54 typedef struct RVDecContext {
56  int sub_id;
58 } RVDecContext;
59 
60 /* (run, length) encoded value for the symbols table. The actual symbols
61  * are run..run - length (mod 256).
62  * The last two entries in the following table apply to luma only.
63  * The skip values are not included in this list. */
64 static const uint8_t rv_sym_run_len[][2] = {
65  { 0, 0 }, { 1, 0 }, { 255, 0 }, { 3, 1 }, { 254, 1 },
66  { 7, 3 }, { 252, 3 }, { 15, 7 }, { 248, 7 }, { 31, 15 },
67  { 240, 15 }, { 63, 31 }, { 224, 31 }, { 127, 63 }, { 192, 63 },
68  { 255, 127 }, { 128, 127 }, { 127, 255 }, { 128, 255 },
69 };
70 
71 /* entry[i] of the following tables gives
72  * the number of VLC codes of length i + 2. */
73 static const uint16_t rv_lum_len_count[15] = {
74  1, 0, 2, 4, 8, 16, 32, 0, 64, 0, 128, 0, 256, 0, 512,
75 };
76 
77 static const uint16_t rv_chrom_len_count[15] = {
78  1, 2, 4, 0, 8, 0, 16, 0, 32, 0, 64, 0, 128, 0, 256,
79 };
80 
82 
84 {
85  int code;
86 
87  if (n < 4) {
89  } else {
91  if (code < 0) {
92  av_log(s->avctx, AV_LOG_ERROR, "chroma dc error\n");
93  return -1;
94  }
95  }
96  return code;
97 }
98 
99 /* read RV 1.0 compatible frame header */
101 {
102  int mb_count, pb_frame, marker, mb_xy;
103 
104  marker = get_bits1(&s->gb);
105 
106  if (get_bits1(&s->gb))
107  s->pict_type = AV_PICTURE_TYPE_P;
108  else
109  s->pict_type = AV_PICTURE_TYPE_I;
110 
111  if (!marker)
112  av_log(s->avctx, AV_LOG_ERROR, "marker missing\n");
113 
114  pb_frame = get_bits1(&s->gb);
115 
116  ff_dlog(s->avctx, "pict_type=%d pb_frame=%d\n", s->pict_type, pb_frame);
117 
118  if (pb_frame) {
119  avpriv_request_sample(s->avctx, "PB-frame");
120  return AVERROR_PATCHWELCOME;
121  }
122 
123  s->qscale = get_bits(&s->gb, 5);
124  if (s->qscale == 0) {
125  av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
126  return AVERROR_INVALIDDATA;
127  }
128 
129  if (s->pict_type == AV_PICTURE_TYPE_I) {
130  if (s->rv10_version == 3) {
131  /* specific MPEG like DC coding not used */
132  s->last_dc[0] = get_bits(&s->gb, 8);
133  s->last_dc[1] = get_bits(&s->gb, 8);
134  s->last_dc[2] = get_bits(&s->gb, 8);
135  ff_dlog(s->avctx, "DC:%d %d %d\n", s->last_dc[0],
136  s->last_dc[1], s->last_dc[2]);
137  }
138  }
139  /* if multiple packets per frame are sent, the position at which
140  * to display the macroblocks is coded here */
141 
142  mb_xy = s->mb_x + s->mb_y * s->mb_width;
143  if (show_bits(&s->gb, 12) == 0 || (mb_xy && mb_xy < s->mb_num)) {
144  s->mb_x = get_bits(&s->gb, 6); /* mb_x */
145  s->mb_y = get_bits(&s->gb, 6); /* mb_y */
146  mb_count = get_bits(&s->gb, 12);
147  } else {
148  s->mb_x = 0;
149  s->mb_y = 0;
150  mb_count = s->mb_width * s->mb_height;
151  }
152  skip_bits(&s->gb, 3); /* ignored */
153  s->f_code = 1;
154 
155  return mb_count;
156 }
157 
158 static int rv20_decode_picture_header(RVDecContext *rv, int whole_size)
159 {
160  static const enum AVPictureType pict_types[] =
161  { AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_I /* hmm ... */,
163  MpegEncContext *s = &rv->m;
164  int seq, mb_pos, ret;
165  int rpr_max;
166 
167  s->pict_type = pict_types[get_bits(&s->gb, 2)];
168 
169  if (s->low_delay && s->pict_type == AV_PICTURE_TYPE_B) {
170  av_log(s->avctx, AV_LOG_ERROR, "low delay B\n");
171  return -1;
172  }
173  if (!s->last_picture_ptr && s->pict_type == AV_PICTURE_TYPE_B) {
174  av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");
175  return AVERROR_INVALIDDATA;
176  }
177 
178  if (get_bits1(&s->gb)) {
179  av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n");
180  return AVERROR_INVALIDDATA;
181  }
182 
183  s->qscale = get_bits(&s->gb, 5);
184  if (s->qscale == 0) {
185  av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
186  return AVERROR_INVALIDDATA;
187  }
188 
189  if (RV_GET_MINOR_VER(rv->sub_id) >= 2)
190  s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres;
191 
192  if (RV_GET_MINOR_VER(rv->sub_id) <= 1)
193  seq = get_bits(&s->gb, 8) << 7;
194  else
195  seq = get_bits(&s->gb, 13) << 2;
196 
197  rpr_max = s->avctx->extradata[1] & 7;
198  if (rpr_max) {
199  int f, new_w, new_h;
200  int rpr_bits = av_log2(rpr_max) + 1;
201 
202  f = get_bits(&s->gb, rpr_bits);
203 
204  if (f) {
205  if (s->avctx->extradata_size < 8 + 2 * f) {
206  av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n");
207  return AVERROR_INVALIDDATA;
208  }
209 
210  new_w = 4 * ((uint8_t *) s->avctx->extradata)[6 + 2 * f];
211  new_h = 4 * ((uint8_t *) s->avctx->extradata)[7 + 2 * f];
212  } else {
213  new_w = rv->orig_width;
214  new_h = rv->orig_height;
215  }
216  if (new_w != s->width || new_h != s->height || !s->context_initialized) {
217  AVRational old_aspect = s->avctx->sample_aspect_ratio;
218  av_log(s->avctx, AV_LOG_DEBUG,
219  "attempting to change resolution to %dx%d\n", new_w, new_h);
220  if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0)
221  return AVERROR_INVALIDDATA;
222 
223  if (whole_size < (new_w + 15)/16 * ((new_h + 15)/16) / 8)
224  return AVERROR_INVALIDDATA;
225 
227 
228  // attempt to keep aspect during typical resolution switches
229  if (!old_aspect.num)
230  old_aspect = (AVRational){1, 1};
231  if (2 * (int64_t)new_w * s->height == (int64_t)new_h * s->width)
232  s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1});
233  if ((int64_t)new_w * s->height == 2 * (int64_t)new_h * s->width)
234  s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2});
235 
236  ret = ff_set_dimensions(s->avctx, new_w, new_h);
237  if (ret < 0)
238  return ret;
239 
240  s->width = new_w;
241  s->height = new_h;
242  if ((ret = ff_mpv_common_init(s)) < 0)
243  return ret;
244  }
245 
246  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
247  av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d/%d\n", f, rpr_bits, rpr_max);
248  }
249  }
250  if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)
251  return AVERROR_INVALIDDATA;
252 
253  mb_pos = ff_h263_decode_mba(s);
254 
255  seq |= s->time & ~0x7FFF;
256  if (seq - s->time > 0x4000)
257  seq -= 0x8000;
258  if (seq - s->time < -0x4000)
259  seq += 0x8000;
260 
261  if (seq != s->time) {
262  if (s->pict_type != AV_PICTURE_TYPE_B) {
263  s->time = seq;
264  s->pp_time = s->time - s->last_non_b_time;
265  s->last_non_b_time = s->time;
266  } else {
267  s->time = seq;
268  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
269  }
270  }
271  if (s->pict_type == AV_PICTURE_TYPE_B) {
272  if (s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0) {
273  av_log(s->avctx, AV_LOG_DEBUG,
274  "messed up order, possible from seeking? skipping current B-frame\n");
275 #define ERROR_SKIP_FRAME -123
276  return ERROR_SKIP_FRAME;
277  }
279  }
280 
281  s->no_rounding = get_bits1(&s->gb);
282 
283  if (RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B)
284  // binary decoder reads 3+2 bits here but they don't seem to be used
285  skip_bits(&s->gb, 5);
286 
287  s->f_code = 1;
288  s->h263_aic = s->pict_type == AV_PICTURE_TYPE_I;
289  s->modified_quant = 1;
290  if (!s->avctx->lowres)
291  s->loop_filter = 1;
292 
293  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
294  av_log(s->avctx, AV_LOG_INFO,
295  "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",
296  seq, s->mb_x, s->mb_y, s->pict_type, s->qscale,
297  s->no_rounding);
298  }
299 
300  av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);
301 
302  return s->mb_width * s->mb_height - mb_pos;
303 }
304 
305 static av_cold void rv10_build_vlc(VLC *vlc, const uint16_t len_count[15],
306  const uint8_t sym_rl[][2], int sym_rl_elems)
307 {
308  uint16_t syms[MAX_VLC_ENTRIES];
309  uint8_t lens[MAX_VLC_ENTRIES];
310  unsigned nb_syms = 0, nb_lens = 0;
311 
312  for (unsigned i = 0; i < sym_rl_elems; i++) {
313  unsigned cur_sym = sym_rl[i][0];
314  for (unsigned tmp = nb_syms + sym_rl[i][1]; nb_syms <= tmp; nb_syms++)
315  syms[nb_syms] = 0xFF & cur_sym--;
316  }
317 
318  for (unsigned i = 0; i < 15; i++)
319  for (unsigned tmp = nb_lens + len_count[i]; nb_lens < tmp; nb_lens++)
320  lens[nb_lens] = i + 2;
321  av_assert1(nb_lens == nb_syms);
322  ff_vlc_init_from_lengths(vlc, DC_VLC_BITS, nb_lens, lens, 1,
323  syms, 2, 2, 0, VLC_INIT_STATIC_OVERLONG, NULL);
324 }
325 
326 static av_cold void rv10_init_static(void)
327 {
328  static VLCElem table[1472 + 992];
329 
331  rv_dc_lum.table_allocated = 1472;
334  for (int i = 0; i < 1 << (DC_VLC_BITS - 7 /* Length of skip prefix */); i++) {
335  /* All codes beginning with 0x7F have the same length and value.
336  * Modifying the table directly saves us the useless subtables. */
337  rv_dc_lum.table[(0x7F << (DC_VLC_BITS - 7)) + i].sym = 255;
338  rv_dc_lum.table[(0x7F << (DC_VLC_BITS - 7)) + i].len = 18;
339  }
340  rv_dc_chrom.table = &table[1472];
344  for (int i = 0; i < 1 << (DC_VLC_BITS - 9 /* Length of skip prefix */); i++) {
345  /* Same as above. */
346  rv_dc_chrom.table[(0x1FE << (DC_VLC_BITS - 9)) + i].sym = 255;
347  rv_dc_chrom.table[(0x1FE << (DC_VLC_BITS - 9)) + i].len = 18;
348  }
350 }
351 
353 {
354  static AVOnce init_static_once = AV_ONCE_INIT;
355  RVDecContext *rv = avctx->priv_data;
356  MpegEncContext *s = &rv->m;
357  int major_ver, minor_ver, micro_ver, ret;
358 
359  if (avctx->extradata_size < 8) {
360  av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
361  return AVERROR_INVALIDDATA;
362  }
363  if ((ret = av_image_check_size(avctx->coded_width,
364  avctx->coded_height, 0, avctx)) < 0)
365  return ret;
366 
367  ff_mpv_decode_init(s, avctx);
368 
369  s->out_format = FMT_H263;
370 
371  rv->orig_width =
372  s->width = avctx->coded_width;
373  rv->orig_height =
374  s->height = avctx->coded_height;
375 
376  s->h263_long_vectors = ((uint8_t *) avctx->extradata)[3] & 1;
377  rv->sub_id = AV_RB32((uint8_t *) avctx->extradata + 4);
378 
379  major_ver = RV_GET_MAJOR_VER(rv->sub_id);
380  minor_ver = RV_GET_MINOR_VER(rv->sub_id);
381  micro_ver = RV_GET_MICRO_VER(rv->sub_id);
382 
383  s->low_delay = 1;
384  switch (major_ver) {
385  case 1:
386  s->rv10_version = micro_ver ? 3 : 1;
387  s->obmc = micro_ver == 2;
388  break;
389  case 2:
390  if (minor_ver >= 2) {
391  s->low_delay = 0;
392  s->avctx->has_b_frames = 1;
393  }
394  break;
395  default:
396  av_log(s->avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id);
397  avpriv_request_sample(avctx, "RV1/2 version");
398  return AVERROR_PATCHWELCOME;
399  }
400 
401  if (avctx->debug & FF_DEBUG_PICT_INFO) {
402  av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%"PRIX32"\n", rv->sub_id,
403  ((uint32_t *) avctx->extradata)[0]);
404  }
405 
406  avctx->pix_fmt = AV_PIX_FMT_YUV420P;
407 
408  if ((ret = ff_mpv_common_init(s)) < 0)
409  return ret;
410 
411  ff_h263dsp_init(&s->h263dsp);
412 
413  /* init static VLCs */
414  ff_thread_once(&init_static_once, rv10_init_static);
415 
416  return 0;
417 }
418 
420 {
421  MpegEncContext *s = avctx->priv_data;
422 
424  return 0;
425 }
426 
427 static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,
428  int buf_size, int buf_size2, int whole_size)
429 {
430  RVDecContext *rv = avctx->priv_data;
431  MpegEncContext *s = &rv->m;
432  int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret;
433 
434  active_bits_size = buf_size * 8;
435  init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8);
436  if (s->codec_id == AV_CODEC_ID_RV10)
437  mb_count = rv10_decode_picture_header(s);
438  else
439  mb_count = rv20_decode_picture_header(rv, whole_size);
440  if (mb_count < 0) {
441  if (mb_count != ERROR_SKIP_FRAME)
442  av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");
443  return AVERROR_INVALIDDATA;
444  }
445 
446  if (s->mb_x >= s->mb_width ||
447  s->mb_y >= s->mb_height) {
448  av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);
449  return AVERROR_INVALIDDATA;
450  }
451  mb_pos = s->mb_y * s->mb_width + s->mb_x;
452  left = s->mb_width * s->mb_height - mb_pos;
453  if (mb_count > left) {
454  av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");
455  return AVERROR_INVALIDDATA;
456  }
457 
458  if (whole_size < s->mb_width * s->mb_height / 8)
459  return AVERROR_INVALIDDATA;
460 
461  if ((s->mb_x == 0 && s->mb_y == 0) || !s->current_picture_ptr) {
462  // FIXME write parser so we always have complete frames?
463  if (s->current_picture_ptr) {
464  ff_er_frame_end(&s->er, NULL);
466  s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;
467  }
468  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
469  return ret;
471  } else {
472  if (s->current_picture_ptr->f->pict_type != s->pict_type) {
473  av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");
474  return AVERROR_INVALIDDATA;
475  }
476  }
477 
478 
479  ff_dlog(avctx, "qscale=%d\n", s->qscale);
480 
481  /* default quantization values */
482  if (s->codec_id == AV_CODEC_ID_RV10) {
483  if (s->mb_y == 0)
484  s->first_slice_line = 1;
485  } else {
486  s->first_slice_line = 1;
487  s->resync_mb_x = s->mb_x;
488  }
489  start_mb_x = s->mb_x;
490  s->resync_mb_y = s->mb_y;
491  if (s->h263_aic) {
492  s->y_dc_scale_table =
493  s->c_dc_scale_table = ff_aic_dc_scale_table;
494  } else {
495  s->y_dc_scale_table =
496  s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
497  }
498 
499  if (s->modified_quant)
500  s->chroma_qscale_table = ff_h263_chroma_qscale_table;
501 
502  ff_set_qscale(s, s->qscale);
503 
504  s->rv10_first_dc_coded[0] = 0;
505  s->rv10_first_dc_coded[1] = 0;
506  s->rv10_first_dc_coded[2] = 0;
507  s->block_wrap[0] =
508  s->block_wrap[1] =
509  s->block_wrap[2] =
510  s->block_wrap[3] = s->b8_stride;
511  s->block_wrap[4] =
512  s->block_wrap[5] = s->mb_stride;
514 
515  /* decode each macroblock */
516  for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) {
517  int ret;
518  ff_update_block_index(s, 8, s->avctx->lowres, 1);
519  ff_tlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);
520 
521  s->mv_dir = MV_DIR_FORWARD;
522  s->mv_type = MV_TYPE_16X16;
523  ret = ff_h263_decode_mb(s, s->block);
524 
525  // Repeat the slice end check from ff_h263_decode_mb with our active
526  // bitstream size
527  if (ret != SLICE_ERROR && active_bits_size >= get_bits_count(&s->gb)) {
528  int v = show_bits(&s->gb, 16);
529 
530  if (get_bits_count(&s->gb) + 16 > active_bits_size)
531  v >>= get_bits_count(&s->gb) + 16 - active_bits_size;
532 
533  if (!v)
534  ret = SLICE_END;
535  }
536  if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) &&
537  8 * buf_size2 >= get_bits_count(&s->gb)) {
538  active_bits_size = buf_size2 * 8;
539  av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n",
540  8 * buf_size, active_bits_size);
541  ret = SLICE_OK;
542  }
543 
544  if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) {
545  av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x,
546  s->mb_y);
547  return AVERROR_INVALIDDATA;
548  }
549  if (s->pict_type != AV_PICTURE_TYPE_B)
551  ff_mpv_reconstruct_mb(s, s->block);
552  if (s->loop_filter)
554 
555  if (++s->mb_x == s->mb_width) {
556  s->mb_x = 0;
557  s->mb_y++;
559  }
560  if (s->mb_x == s->resync_mb_x)
561  s->first_slice_line = 0;
562  if (ret == SLICE_END)
563  break;
564  }
565 
566  ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y,
567  ER_MB_END);
568 
569  return active_bits_size;
570 }
571 
572 static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
573 {
574  return AV_RL32(buf + n * 8);
575 }
576 
577 static int rv10_decode_frame(AVCodecContext *avctx, AVFrame *pict,
578  int *got_frame, AVPacket *avpkt)
579 {
580  const uint8_t *buf = avpkt->data;
581  int buf_size = avpkt->size;
582  MpegEncContext *s = avctx->priv_data;
583  int i, ret;
584  int slice_count;
585  const uint8_t *slices_hdr = NULL;
586 
587  ff_dlog(avctx, "*****frame %"PRId64" size=%d\n", avctx->frame_num, buf_size);
588 
589  /* no supplementary picture */
590  if (buf_size == 0) {
591  return 0;
592  }
593 
594  slice_count = (*buf++) + 1;
595  buf_size--;
596 
597  if (!slice_count || buf_size <= 8 * slice_count) {
598  av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n",
599  slice_count);
600  return AVERROR_INVALIDDATA;
601  }
602 
603  slices_hdr = buf + 4;
604  buf += 8 * slice_count;
605  buf_size -= 8 * slice_count;
606 
607  for (i = 0; i < slice_count; i++) {
608  unsigned offset = get_slice_offset(avctx, slices_hdr, i);
609  int size, size2;
610 
611  if (offset >= buf_size)
612  return AVERROR_INVALIDDATA;
613 
614  if (i + 1 == slice_count)
615  size = buf_size - offset;
616  else
617  size = get_slice_offset(avctx, slices_hdr, i + 1) - offset;
618 
619  if (i + 2 >= slice_count)
620  size2 = buf_size - offset;
621  else
622  size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset;
623 
624  if (size <= 0 || size2 <= 0 ||
625  offset + FFMAX(size, size2) > buf_size)
626  return AVERROR_INVALIDDATA;
627 
628  if ((ret = rv10_decode_packet(avctx, buf + offset, size, size2, buf_size)) < 0)
629  return ret;
630 
631  if (ret > 8 * size)
632  i++;
633  }
634 
635  if (s->current_picture_ptr && s->mb_y >= s->mb_height) {
636  ff_er_frame_end(&s->er, NULL);
638 
639  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
640  if ((ret = av_frame_ref(pict, s->current_picture_ptr->f)) < 0)
641  return ret;
642  ff_print_debug_info(s, s->current_picture_ptr, pict);
643  ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG1);
644  } else if (s->last_picture_ptr) {
645  if ((ret = av_frame_ref(pict, s->last_picture_ptr->f)) < 0)
646  return ret;
647  ff_print_debug_info(s, s->last_picture_ptr, pict);
648  ff_mpv_export_qp_table(s, pict,s->last_picture_ptr, FF_MPV_QSCALE_TYPE_MPEG1);
649  }
650 
651  if (s->last_picture_ptr || s->low_delay) {
652  *got_frame = 1;
653  }
654 
655  // so we can detect if frame_end was not called (find some nicer solution...)
656  s->current_picture_ptr = NULL;
657  }
658 
659  return avpkt->size;
660 }
661 
663  .p.name = "rv10",
664  CODEC_LONG_NAME("RealVideo 1.0"),
665  .p.type = AVMEDIA_TYPE_VIDEO,
666  .p.id = AV_CODEC_ID_RV10,
667  .priv_data_size = sizeof(RVDecContext),
669  .close = rv10_decode_end,
671  .p.capabilities = AV_CODEC_CAP_DR1,
672  .p.max_lowres = 3,
673 };
674 
676  .p.name = "rv20",
677  CODEC_LONG_NAME("RealVideo 2.0"),
678  .p.type = AVMEDIA_TYPE_VIDEO,
679  .p.id = AV_CODEC_ID_RV20,
680  .priv_data_size = sizeof(RVDecContext),
682  .close = rv10_decode_end,
684  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
685  .flush = ff_mpeg_flush,
686  .p.max_lowres = 3,
687 };
ff_mpv_common_init
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:682
MV_TYPE_16X16
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:267
h263data.h
ff_vlc_init_from_lengths
int ff_vlc_init_from_lengths(VLC *vlc, int nb_bits, int nb_codes, const int8_t *lens, int lens_wrap, const void *symbols, int symbols_wrap, int symbols_size, int offset, int flags, void *logctx)
Build VLC decoding tables suitable for use with get_vlc2()
Definition: vlc.c:306
RV_GET_MINOR_VER
#define RV_GET_MINOR_VER(x)
Definition: rv10.c:48
ff_mpv_export_qp_table
int ff_mpv_export_qp_table(const MpegEncContext *s, AVFrame *f, const Picture *p, int qp_type)
Definition: mpegvideo_dec.c:467
ff_h263_decode_mb
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:787
thread.h
AVPictureType
AVPictureType
Definition: avutil.h:277
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:266
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:374
tmp
static uint8_t tmp[11]
Definition: aes_ctr.c:28
AVPacket::data
uint8_t * data
Definition: packet.h:524
table
static const uint16_t table[]
Definition: prosumer.c:203
FFCodec
Definition: codec_internal.h:126
VLCElem::len
VLCBaseType len
Definition: vlc.h:33
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:821
ff_init_block_index
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:843
mpegvideo.h
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
ff_h263_decode_mba
int ff_h263_decode_mba(MpegEncContext *s)
Definition: ituh263dec.c:142
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:94
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:514
RVDecContext
Definition: rv10.c:54
FF_DEBUG_PICT_INFO
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1397
MAX_VLC_ENTRIES
#define MAX_VLC_ENTRIES
Definition: rv10.c:51
skip_bits
static void skip_bits(GetBitContext *s, int n)
Definition: get_bits.h:381
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:335
ff_mpv_reconstruct_mb
void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo_dec.c:970
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:130
VLCElem::sym
VLCBaseType sym
Definition: vlc.h:33
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:633
ff_print_debug_info
void ff_print_debug_info(const MpegEncContext *s, const Picture *p, AVFrame *pict)
Definition: mpegvideo_dec.c:460
SLICE_END
#define SLICE_END
end marker found
Definition: mpegvideo.h:479
ff_h263_update_motion_val
void ff_h263_update_motion_val(MpegEncContext *s)
Definition: h263.c:53
AVRational::num
int num
Numerator.
Definition: rational.h:59
rv10_decode_end
static av_cold int rv10_decode_end(AVCodecContext *avctx)
Definition: rv10.c:419
ff_mpv_common_end
void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:783
ff_thread_once
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:205
mpegvideodec.h
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
h263dec.h
FF_ARRAY_ELEMS
#define FF_ARRAY_ELEMS(a)
Definition: sinewin_tablegen.c:29
av_cold
#define av_cold
Definition: attributes.h:90
rv10_decode_picture_header
static int rv10_decode_picture_header(MpegEncContext *s)
Definition: rv10.c:100
AVCodecContext::extradata_size
int extradata_size
Definition: avcodec.h:524
ff_er_frame_end
void ff_er_frame_end(ERContext *s, int *decode_error_flags)
Indicate that a frame has finished decoding and perform error concealment in case it has been enabled...
Definition: error_resilience.c:891
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:286
ff_h263_chroma_qscale_table
const uint8_t ff_h263_chroma_qscale_table[32]
Definition: h263data.c:260
s
#define s(width, name)
Definition: cbs_vp9.c:198
RV_GET_MAJOR_VER
#define RV_GET_MAJOR_VER(x)
Definition: rv10.c:47
ff_mpeg_er_frame_start
void ff_mpeg_er_frame_start(MpegEncContext *s)
Definition: mpeg_er.c:48
ff_mpeg1_dc_scale_table
static const uint8_t *const ff_mpeg1_dc_scale_table
Definition: mpegvideodata.h:32
av_assert0
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:40
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:201
rv_dc_chrom
static VLC rv_dc_chrom
Definition: rv10.c:81
decode.h
rv10_build_vlc
static av_cold void rv10_build_vlc(VLC *vlc, const uint16_t len_count[15], const uint8_t sym_rl[][2], int sym_rl_elems)
Definition: rv10.c:305
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:73
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:271
FMT_H263
@ FMT_H263
Definition: mpegvideo.h:65
ff_h263_decode_init_vlc
void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:136
RVDecContext::orig_height
int orig_height
Definition: rv10.c:57
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:203
NULL
#define NULL
Definition: coverity.c:32
AVERROR_PATCHWELCOME
#define AVERROR_PATCHWELCOME
Not yet implemented in FFmpeg, patches welcome.
Definition: error.h:64
RVDecContext::orig_width
int orig_width
Definition: rv10.c:57
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
ERROR_SKIP_FRAME
#define ERROR_SKIP_FRAME
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:279
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:388
ff_set_qscale
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:876
get_vlc2
static av_always_inline int get_vlc2(GetBitContext *s, const VLCElem *table, int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:652
FF_MPV_QSCALE_TYPE_MPEG1
#define FF_MPV_QSCALE_TYPE_MPEG1
Definition: mpegvideodec.h:40
AVOnce
#define AVOnce
Definition: thread.h:202
rv10_decode_frame
static int rv10_decode_frame(AVCodecContext *avctx, AVFrame *pict, int *got_frame, AVPacket *avpkt)
Definition: rv10.c:577
rv_chrom_len_count
static const uint16_t rv_chrom_len_count[15]
Definition: rv10.c:77
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:28
VLC::table_allocated
int table_allocated
Definition: vlc.h:39
ff_rv20_decoder
const FFCodec ff_rv20_decoder
Definition: rv10.c:675
rv_dc_lum
static VLC rv_dc_lum
Definition: rv10.c:81
f
f
Definition: af_crystalizer.c:121
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:366
AV_CODEC_CAP_DR1
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:52
AVPacket::size
int size
Definition: packet.h:525
RV_GET_MICRO_VER
#define RV_GET_MICRO_VER(x)
Definition: rv10.c:49
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:384
codec_internal.h
ff_update_block_index
static void ff_update_block_index(MpegEncContext *s, int bits_per_raw_sample, int lowres, int chroma_x_shift)
Definition: mpegvideo.h:600
size
int size
Definition: twinvq_data.h:10344
VLCElem
Definition: vlc.h:32
ff_h263dsp_init
av_cold void ff_h263dsp_init(H263DSPContext *ctx)
Definition: h263dsp.c:117
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:96
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_dec.c:323
ff_mpeg_flush
void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo_dec.c:505
RVDecContext::m
MpegEncContext m
Definition: rv10.c:55
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
rv10_decode_packet
static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf, int buf_size, int buf_size2, int whole_size)
Definition: rv10.c:427
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:191
rv_sym_run_len
static const uint8_t rv_sym_run_len[][2]
Definition: rv10.c:64
ff_rv_decode_dc
int ff_rv_decode_dc(MpegEncContext *s, int n)
Definition: rv10.c:83
rv10_init_static
static av_cold void rv10_init_static(void)
Definition: rv10.c:326
AV_CODEC_ID_RV10
@ AV_CODEC_ID_RV10
Definition: codec_id.h:57
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:256
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:523
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:371
ff_mpv_decode_init
void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx)
Initialize the given MpegEncContext for decoding.
Definition: mpegvideo_dec.c:45
av_assert1
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:56
AV_CODEC_ID_RV20
@ AV_CODEC_ID_RV20
Definition: codec_id.h:58
AVCodec::name
const char * name
Name of the codec implementation.
Definition: codec.h:194
AVCodecContext::pix_fmt
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:657
ff_rv10_decoder
const FFCodec ff_rv10_decoder
Definition: rv10.c:662
avcodec.h
AVCodecContext::frame_num
int64_t frame_num
Frame counter, set by libavcodec.
Definition: avcodec.h:2031
get_slice_offset
static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
Definition: rv10.c:572
ret
ret
Definition: filter_design.txt:187
SLICE_OK
#define SLICE_OK
Definition: mpegvideo.h:477
ff_aic_dc_scale_table
const uint8_t ff_aic_dc_scale_table[32]
Definition: h263data.c:245
rv20_decode_picture_header
static int rv20_decode_picture_header(RVDecContext *rv, int whole_size)
Definition: rv10.c:158
ff_h263_loop_filter
void ff_h263_loop_filter(MpegEncContext *s)
Definition: h263.c:105
ff_mpeg4_init_direct_mv
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:83
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:92
rv_lum_len_count
static const uint16_t rv_lum_len_count[15]
Definition: rv10.c:73
AVCodecContext
main external API structure.
Definition: avcodec.h:445
VLC_INIT_STATIC_OVERLONG
#define VLC_INIT_STATIC_OVERLONG
Definition: vlc.h:183
AV_PICTURE_TYPE_B
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:281
mpeg4video.h
error_resilience.h
VLC
Definition: vlc.h:36
ff_mpv_frame_end
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo_dec.c:452
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: codec.h:76
VLC::table
VLCElem * table
Definition: vlc.h:38
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:1396
AVCodecContext::coded_width
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:633
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:280
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
rv10_decode_init
static av_cold int rv10_decode_init(AVCodecContext *avctx)
Definition: rv10.c:352
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:36
ER_MB_END
#define ER_MB_END
Definition: error_resilience.h:38
SLICE_ERROR
#define SLICE_ERROR
Definition: mpegvideo.h:478
ff_tlog
#define ff_tlog(ctx,...)
Definition: internal.h:141
MV_DIR_FORWARD
#define MV_DIR_FORWARD
Definition: mpegvideo.h:263
AVPacket
This structure stores compressed data.
Definition: packet.h:501
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:472
mpeg_er.h
DC_VLC_BITS
#define DC_VLC_BITS
Definition: rv10.c:52
imgutils.h
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AVERROR_INVALIDDATA
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:61
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:318
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:73
av_log2
int av_log2(unsigned v)
Definition: intmath.c:26
rv10dec.h
RVDecContext::sub_id
int sub_id
Definition: rv10.c:56
h263.h