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 
81 static VLCElem rv_dc_lum[1472], rv_dc_chrom[992];
82 
84 {
85  int code;
86 
87  if (n < 4) {
88  code = get_vlc2(&s->gb, rv_dc_lum, DC_VLC_BITS, 2);
89  } else {
90  code = get_vlc2(&s->gb, rv_dc_chrom, DC_VLC_BITS, 2);
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 
154  return mb_count;
155 }
156 
157 static int rv20_decode_picture_header(RVDecContext *rv, int whole_size)
158 {
159  static const enum AVPictureType pict_types[] =
160  { AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_I /* hmm ... */,
162  MpegEncContext *s = &rv->m;
163  int seq, mb_pos, ret;
164  int rpr_max;
165 
166  s->pict_type = pict_types[get_bits(&s->gb, 2)];
167 
168  if (s->low_delay && s->pict_type == AV_PICTURE_TYPE_B) {
169  av_log(s->avctx, AV_LOG_ERROR, "low delay B\n");
170  return -1;
171  }
172  if (!s->last_pic.ptr && s->pict_type == AV_PICTURE_TYPE_B) {
173  av_log(s->avctx, AV_LOG_ERROR, "early B-frame\n");
174  return AVERROR_INVALIDDATA;
175  }
176 
177  if (get_bits1(&s->gb)) {
178  av_log(s->avctx, AV_LOG_ERROR, "reserved bit set\n");
179  return AVERROR_INVALIDDATA;
180  }
181 
182  s->qscale = get_bits(&s->gb, 5);
183  if (s->qscale == 0) {
184  av_log(s->avctx, AV_LOG_ERROR, "Invalid qscale value: 0\n");
185  return AVERROR_INVALIDDATA;
186  }
187 
188  if (RV_GET_MINOR_VER(rv->sub_id) >= 2)
189  s->loop_filter = get_bits1(&s->gb) && !s->avctx->lowres;
190 
191  if (RV_GET_MINOR_VER(rv->sub_id) <= 1)
192  seq = get_bits(&s->gb, 8) << 7;
193  else
194  seq = get_bits(&s->gb, 13) << 2;
195 
196  rpr_max = s->avctx->extradata[1] & 7;
197  if (rpr_max) {
198  int f, new_w, new_h;
199  int rpr_bits = av_log2(rpr_max) + 1;
200 
201  f = get_bits(&s->gb, rpr_bits);
202 
203  if (f) {
204  if (s->avctx->extradata_size < 8 + 2 * f) {
205  av_log(s->avctx, AV_LOG_ERROR, "Extradata too small.\n");
206  return AVERROR_INVALIDDATA;
207  }
208 
209  new_w = 4 * s->avctx->extradata[6 + 2 * f];
210  new_h = 4 * s->avctx->extradata[7 + 2 * f];
211  } else {
212  new_w = rv->orig_width;
213  new_h = rv->orig_height;
214  }
215  if (new_w != s->width || new_h != s->height || !s->context_initialized) {
216  AVRational old_aspect = s->avctx->sample_aspect_ratio;
217  av_log(s->avctx, AV_LOG_DEBUG,
218  "attempting to change resolution to %dx%d\n", new_w, new_h);
219  if (av_image_check_size(new_w, new_h, 0, s->avctx) < 0)
220  return AVERROR_INVALIDDATA;
221 
222  if (whole_size < (new_w + 15)/16 * ((new_h + 15)/16) / 8)
223  return AVERROR_INVALIDDATA;
224 
226 
227  // attempt to keep aspect during typical resolution switches
228  if (!old_aspect.num)
229  old_aspect = (AVRational){1, 1};
230  if (2 * (int64_t)new_w * s->height == (int64_t)new_h * s->width)
231  s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){2, 1});
232  if ((int64_t)new_w * s->height == 2 * (int64_t)new_h * s->width)
233  s->avctx->sample_aspect_ratio = av_mul_q(old_aspect, (AVRational){1, 2});
234 
235  ret = ff_set_dimensions(s->avctx, new_w, new_h);
236  if (ret < 0)
237  return ret;
238 
239  s->width = new_w;
240  s->height = new_h;
241  if ((ret = ff_mpv_common_init(s)) < 0)
242  return ret;
243  }
244 
245  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
246  av_log(s->avctx, AV_LOG_DEBUG, "F %d/%d/%d\n", f, rpr_bits, rpr_max);
247  }
248  }
249  if (av_image_check_size(s->width, s->height, 0, s->avctx) < 0)
250  return AVERROR_INVALIDDATA;
251 
252  mb_pos = ff_h263_decode_mba(s);
253 
254  seq |= s->time & ~0x7FFF;
255  if (seq - s->time > 0x4000)
256  seq -= 0x8000;
257  if (seq - s->time < -0x4000)
258  seq += 0x8000;
259 
260  if (seq != s->time) {
261  if (s->pict_type != AV_PICTURE_TYPE_B) {
262  s->time = seq;
263  s->pp_time = s->time - s->last_non_b_time;
264  s->last_non_b_time = s->time;
265  } else {
266  s->time = seq;
267  s->pb_time = s->pp_time - (s->last_non_b_time - s->time);
268  }
269  }
270  if (s->pict_type == AV_PICTURE_TYPE_B) {
271  if (s->pp_time <=s->pb_time || s->pp_time <= s->pp_time - s->pb_time || s->pp_time<=0) {
272  av_log(s->avctx, AV_LOG_DEBUG,
273  "messed up order, possible from seeking? skipping current B-frame\n");
274 #define ERROR_SKIP_FRAME -123
275  return ERROR_SKIP_FRAME;
276  }
278  }
279 
280  s->no_rounding = get_bits1(&s->gb);
281 
282  if (RV_GET_MINOR_VER(rv->sub_id) <= 1 && s->pict_type == AV_PICTURE_TYPE_B)
283  // binary decoder reads 3+2 bits here but they don't seem to be used
284  skip_bits(&s->gb, 5);
285 
286  s->h263_aic = s->pict_type == AV_PICTURE_TYPE_I;
287  if (s->h263_aic) {
288  s->y_dc_scale_table =
289  s->c_dc_scale_table = ff_aic_dc_scale_table;
290  } else {
291  s->y_dc_scale_table =
292  s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
293  }
294  if (!s->avctx->lowres)
295  s->loop_filter = 1;
296 
297  if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
298  av_log(s->avctx, AV_LOG_INFO,
299  "num:%5d x:%2d y:%2d type:%d qscale:%2d rnd:%d\n",
300  seq, s->mb_x, s->mb_y, s->pict_type, s->qscale,
301  s->no_rounding);
302  }
303 
304  av_assert0(s->pict_type != AV_PICTURE_TYPE_B || !s->low_delay);
305 
306  return s->mb_width * s->mb_height - mb_pos;
307 }
308 
309 static av_cold void rv10_build_vlc(VLCElem vlc[], int table_size,
310  const uint16_t len_count[15],
311  const uint8_t sym_rl[][2], int sym_rl_elems)
312 {
313  uint16_t syms[MAX_VLC_ENTRIES];
314  uint8_t lens[MAX_VLC_ENTRIES];
315  unsigned nb_syms = 0, nb_lens = 0;
316 
317  for (unsigned i = 0; i < sym_rl_elems; i++) {
318  unsigned cur_sym = sym_rl[i][0];
319  for (unsigned tmp = nb_syms + sym_rl[i][1]; nb_syms <= tmp; nb_syms++)
320  syms[nb_syms] = 0xFF & cur_sym--;
321  }
322 
323  for (unsigned i = 0; i < 15; i++)
324  for (unsigned tmp = nb_lens + len_count[i]; nb_lens < tmp; nb_lens++)
325  lens[nb_lens] = i + 2;
326  av_assert1(nb_lens == nb_syms);
327  ff_vlc_init_table_from_lengths(vlc, table_size, DC_VLC_BITS, nb_lens,
328  lens, 1, syms, 2, 2, 0, 0);
329 }
330 
331 static av_cold void rv10_init_static(void)
332 {
335  for (int i = 0; i < 1 << (DC_VLC_BITS - 7 /* Length of skip prefix */); i++) {
336  /* All codes beginning with 0x7F have the same length and value.
337  * Modifying the table directly saves us the useless subtables. */
338  rv_dc_lum[(0x7F << (DC_VLC_BITS - 7)) + i].sym = 255;
339  rv_dc_lum[(0x7F << (DC_VLC_BITS - 7)) + i].len = 18;
340  }
343  for (int i = 0; i < 1 << (DC_VLC_BITS - 9 /* Length of skip prefix */); i++) {
344  /* Same as above. */
345  rv_dc_chrom[(0x1FE << (DC_VLC_BITS - 9)) + i].sym = 255;
346  rv_dc_chrom[(0x1FE << (DC_VLC_BITS - 9)) + i].len = 18;
347  }
348 }
349 
351 {
352  static AVOnce init_static_once = AV_ONCE_INIT;
353  RVDecContext *rv = avctx->priv_data;
354  MpegEncContext *s = &rv->m;
355  int major_ver, minor_ver, micro_ver, ret;
356 
357  if (avctx->extradata_size < 8) {
358  av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
359  return AVERROR_INVALIDDATA;
360  }
361  if ((ret = av_image_check_size(avctx->coded_width,
362  avctx->coded_height, 0, avctx)) < 0)
363  return ret;
364 
365  ret = ff_h263_decode_init(avctx);
366  if (ret < 0)
367  return ret;
368 
369  rv->orig_width = avctx->coded_width;
370  rv->orig_height = avctx->coded_height;
371 
372  s->h263_long_vectors = avctx->extradata[3] & 1;
373  rv->sub_id = AV_RB32A(avctx->extradata + 4);
374  if (avctx->codec_id == AV_CODEC_ID_RV20) {
375  s->modified_quant = 1;
376  s->chroma_qscale_table = ff_h263_chroma_qscale_table;
377  }
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  switch (major_ver) {
384  case 1:
385  s->rv10_version = micro_ver ? 3 : 1;
386  s->obmc = micro_ver == 2;
387  break;
388  case 2:
389  if (minor_ver >= 2) {
390  s->low_delay = 0;
391  avctx->has_b_frames = 1;
392  }
393  break;
394  default:
395  av_log(avctx, AV_LOG_ERROR, "unknown header %X\n", rv->sub_id);
396  avpriv_request_sample(avctx, "RV1/2 version");
397  return AVERROR_PATCHWELCOME;
398  }
399 
400  if (avctx->debug & FF_DEBUG_PICT_INFO) {
401  av_log(avctx, AV_LOG_DEBUG, "ver:%X ver0:%"PRIX32"\n", rv->sub_id,
402  AV_RL32A(avctx->extradata));
403  }
404 
405  /* init static VLCs */
406  ff_thread_once(&init_static_once, rv10_init_static);
407 
408  return 0;
409 }
410 
411 static int rv10_decode_packet(AVCodecContext *avctx, const uint8_t *buf,
412  int buf_size, int buf_size2, int whole_size)
413 {
414  RVDecContext *rv = avctx->priv_data;
415  MpegEncContext *s = &rv->m;
416  int mb_count, mb_pos, left, start_mb_x, active_bits_size, ret;
417 
418  active_bits_size = buf_size * 8;
419  init_get_bits(&s->gb, buf, FFMAX(buf_size, buf_size2) * 8);
420  if (s->codec_id == AV_CODEC_ID_RV10)
421  mb_count = rv10_decode_picture_header(s);
422  else
423  mb_count = rv20_decode_picture_header(rv, whole_size);
424  if (mb_count < 0) {
425  if (mb_count != ERROR_SKIP_FRAME)
426  av_log(s->avctx, AV_LOG_ERROR, "HEADER ERROR\n");
427  return AVERROR_INVALIDDATA;
428  }
429 
430  if (s->mb_x >= s->mb_width ||
431  s->mb_y >= s->mb_height) {
432  av_log(s->avctx, AV_LOG_ERROR, "POS ERROR %d %d\n", s->mb_x, s->mb_y);
433  return AVERROR_INVALIDDATA;
434  }
435  mb_pos = s->mb_y * s->mb_width + s->mb_x;
436  left = s->mb_width * s->mb_height - mb_pos;
437  if (mb_count > left) {
438  av_log(s->avctx, AV_LOG_ERROR, "COUNT ERROR\n");
439  return AVERROR_INVALIDDATA;
440  }
441 
442  if (whole_size < s->mb_width * s->mb_height / 8)
443  return AVERROR_INVALIDDATA;
444 
445  if ((s->mb_x == 0 && s->mb_y == 0) || !s->cur_pic.ptr) {
446  // FIXME write parser so we always have complete frames?
447  if (s->cur_pic.ptr) {
448  ff_er_frame_end(&s->er, NULL);
450  s->mb_x = s->mb_y = s->resync_mb_x = s->resync_mb_y = 0;
451  }
452  if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
453  return ret;
455  } else {
456  if (s->cur_pic.ptr->f->pict_type != s->pict_type) {
457  av_log(s->avctx, AV_LOG_ERROR, "Slice type mismatch\n");
458  return AVERROR_INVALIDDATA;
459  }
460  }
461 
462 
463  ff_dlog(avctx, "qscale=%d\n", s->qscale);
464 
465  /* default quantization values */
466  if (s->codec_id == AV_CODEC_ID_RV10) {
467  if (s->mb_y == 0)
468  s->first_slice_line = 1;
469  } else {
470  s->first_slice_line = 1;
471  s->resync_mb_x = s->mb_x;
472  }
473  start_mb_x = s->mb_x;
474  s->resync_mb_y = s->mb_y;
475 
476  ff_set_qscale(s, s->qscale);
477 
478  s->rv10_first_dc_coded[0] = 0;
479  s->rv10_first_dc_coded[1] = 0;
480  s->rv10_first_dc_coded[2] = 0;
482 
483  /* decode each macroblock */
484  for (s->mb_num_left = mb_count; s->mb_num_left > 0; s->mb_num_left--) {
485  int ret;
486  ff_update_block_index(s, 8, s->avctx->lowres, 1);
487  ff_tlog(avctx, "**mb x=%d y=%d\n", s->mb_x, s->mb_y);
488 
489  s->mv_dir = MV_DIR_FORWARD;
490  s->mv_type = MV_TYPE_16X16;
491  ret = ff_h263_decode_mb(s, s->block);
492 
493  // Repeat the slice end check from ff_h263_decode_mb with our active
494  // bitstream size
495  if (ret != SLICE_ERROR && active_bits_size >= get_bits_count(&s->gb)) {
496  int v = show_bits(&s->gb, 16);
497 
498  if (get_bits_count(&s->gb) + 16 > active_bits_size)
499  v >>= get_bits_count(&s->gb) + 16 - active_bits_size;
500 
501  if (!v)
502  ret = SLICE_END;
503  }
504  if (ret != SLICE_ERROR && active_bits_size < get_bits_count(&s->gb) &&
505  8 * buf_size2 >= get_bits_count(&s->gb)) {
506  active_bits_size = buf_size2 * 8;
507  av_log(avctx, AV_LOG_DEBUG, "update size from %d to %d\n",
508  8 * buf_size, active_bits_size);
509  ret = SLICE_OK;
510  }
511 
512  if (ret == SLICE_ERROR || active_bits_size < get_bits_count(&s->gb)) {
513  av_log(s->avctx, AV_LOG_ERROR, "ERROR at MB %d %d\n", s->mb_x,
514  s->mb_y);
515  return AVERROR_INVALIDDATA;
516  }
517  if (s->pict_type != AV_PICTURE_TYPE_B)
519  ff_mpv_reconstruct_mb(s, s->block);
520  if (s->loop_filter)
522 
523  if (++s->mb_x == s->mb_width) {
524  s->mb_x = 0;
525  s->mb_y++;
527  }
528  if (s->mb_x == s->resync_mb_x)
529  s->first_slice_line = 0;
530  if (ret == SLICE_END)
531  break;
532  }
533 
534  ff_er_add_slice(&s->er, start_mb_x, s->resync_mb_y, s->mb_x - 1, s->mb_y,
535  ER_MB_END);
536 
537  return active_bits_size;
538 }
539 
540 static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
541 {
542  return AV_RL32(buf + n * 8);
543 }
544 
545 static int rv10_decode_frame(AVCodecContext *avctx, AVFrame *pict,
546  int *got_frame, AVPacket *avpkt)
547 {
548  const uint8_t *buf = avpkt->data;
549  int buf_size = avpkt->size;
550  MpegEncContext *s = avctx->priv_data;
551  int i, ret;
552  int slice_count;
553  const uint8_t *slices_hdr = NULL;
554 
555  ff_dlog(avctx, "*****frame %"PRId64" size=%d\n", avctx->frame_num, buf_size);
556 
557  /* no supplementary picture */
558  if (buf_size == 0) {
559  return 0;
560  }
561 
562  slice_count = (*buf++) + 1;
563  buf_size--;
564 
565  if (!slice_count || buf_size <= 8 * slice_count) {
566  av_log(avctx, AV_LOG_ERROR, "Invalid slice count: %d.\n",
567  slice_count);
568  return AVERROR_INVALIDDATA;
569  }
570 
571  slices_hdr = buf + 4;
572  buf += 8 * slice_count;
573  buf_size -= 8 * slice_count;
574 
575  for (i = 0; i < slice_count; i++) {
576  unsigned offset = get_slice_offset(avctx, slices_hdr, i);
577  int size, size2;
578 
579  if (offset >= buf_size)
580  return AVERROR_INVALIDDATA;
581 
582  if (i + 1 == slice_count)
583  size = buf_size - offset;
584  else
585  size = get_slice_offset(avctx, slices_hdr, i + 1) - offset;
586 
587  if (i + 2 >= slice_count)
588  size2 = buf_size - offset;
589  else
590  size2 = get_slice_offset(avctx, slices_hdr, i + 2) - offset;
591 
592  if (size <= 0 || size2 <= 0 ||
593  offset + FFMAX(size, size2) > buf_size)
594  return AVERROR_INVALIDDATA;
595 
596  if ((ret = rv10_decode_packet(avctx, buf + offset, size, size2, buf_size)) < 0)
597  return ret;
598 
599  if (ret > 8 * size)
600  i++;
601  }
602 
603  if (s->cur_pic.ptr && s->mb_y >= s->mb_height) {
604  ff_er_frame_end(&s->er, NULL);
606 
607  if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
608  if ((ret = av_frame_ref(pict, s->cur_pic.ptr->f)) < 0)
609  return ret;
610  ff_print_debug_info(s, s->cur_pic.ptr, pict);
611  ff_mpv_export_qp_table(s, pict, s->cur_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG1);
612  } else if (s->last_pic.ptr) {
613  if ((ret = av_frame_ref(pict, s->last_pic.ptr->f)) < 0)
614  return ret;
615  ff_print_debug_info(s, s->last_pic.ptr, pict);
616  ff_mpv_export_qp_table(s, pict,s->last_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG1);
617  }
618 
619  if (s->last_pic.ptr || s->low_delay) {
620  *got_frame = 1;
621  }
622 
623  // so we can detect if frame_end was not called (find some nicer solution...)
624  ff_mpv_unref_picture(&s->cur_pic);
625  }
626 
627  return avpkt->size;
628 }
629 
631  .p.name = "rv10",
632  CODEC_LONG_NAME("RealVideo 1.0"),
633  .p.type = AVMEDIA_TYPE_VIDEO,
634  .p.id = AV_CODEC_ID_RV10,
635  .priv_data_size = sizeof(RVDecContext),
638  .close = ff_mpv_decode_close,
639  .p.capabilities = AV_CODEC_CAP_DR1,
640  .p.max_lowres = 3,
641  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
642 };
643 
645  .p.name = "rv20",
646  CODEC_LONG_NAME("RealVideo 2.0"),
647  .p.type = AVMEDIA_TYPE_VIDEO,
648  .p.id = AV_CODEC_ID_RV20,
649  .priv_data_size = sizeof(RVDecContext),
652  .close = ff_mpv_decode_close,
653  .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
654  .flush = ff_mpeg_flush,
655  .p.max_lowres = 3,
656  .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
657 };
ff_mpv_common_init
av_cold int ff_mpv_common_init(MpegEncContext *s)
init common structure for both encoder and decoder.
Definition: mpegvideo.c:398
MV_TYPE_16X16
#define MV_TYPE_16X16
1 vector for the whole mb
Definition: mpegvideo.h:185
h263data.h
rv_dc_lum
static VLCElem rv_dc_lum[1472]
Definition: rv10.c:81
FF_CODEC_CAP_INIT_CLEANUP
#define FF_CODEC_CAP_INIT_CLEANUP
The codec allows calling the close function for deallocation even if the init function returned a fai...
Definition: codec_internal.h:42
RV_GET_MINOR_VER
#define RV_GET_MINOR_VER(x)
Definition: rv10.c:48
ff_h263_decode_mb
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:779
thread.h
AVPictureType
AVPictureType
Definition: avutil.h:276
int64_t
long long int64_t
Definition: coverity.c:34
get_bits_count
static int get_bits_count(const GetBitContext *s)
Definition: get_bits.h:249
AV_RB32A
#define AV_RB32A(p)
Definition: intreadwrite.h:575
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:410
AVPacket::data
uint8_t * data
Definition: packet.h:535
FFCodec
Definition: codec_internal.h:127
VLCElem::len
VLCBaseType len
Definition: vlc.h:37
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:826
ff_init_block_index
void ff_init_block_index(MpegEncContext *s)
Definition: mpegvideo.c:511
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:144
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:91
init_get_bits
static int init_get_bits(GetBitContext *s, const uint8_t *buffer, int bit_size)
Initialize GetBitContext.
Definition: get_bits.h:497
RVDecContext
Definition: rv10.c:54
FF_DEBUG_PICT_INFO
#define FF_DEBUG_PICT_INFO
Definition: avcodec.h:1375
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:364
get_bits
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:318
ff_mpv_reconstruct_mb
void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64])
Definition: mpegvideo_dec.c:1067
FFCodec::p
AVCodec p
The public AVCodec.
Definition: codec_internal.h:131
VLCElem::sym
VLCBaseType sym
Definition: vlc.h:36
AVCodecContext::coded_height
int coded_height
Definition: avcodec.h:607
SLICE_END
#define SLICE_END
end marker found
Definition: mpegvideo.h:318
ff_h263_update_motion_val
void ff_h263_update_motion_val(MpegEncContext *s)
Definition: h263.c:56
AVRational::num
int num
Numerator.
Definition: rational.h:59
ff_thread_once
static int ff_thread_once(char *control, void(*routine)(void))
Definition: thread.h:205
mpegvideodec.h
rv10_build_vlc
static av_cold void rv10_build_vlc(VLCElem vlc[], int table_size, const uint16_t len_count[15], const uint8_t sym_rl[][2], int sym_rl_elems)
Definition: rv10.c:309
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:210
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:515
AVCodecContext::has_b_frames
int has_b_frames
Size of the frame reordering buffer in the decoder.
Definition: avcodec.h:697
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:896
ff_mpeg_flush
av_cold void ff_mpeg_flush(AVCodecContext *avctx)
Definition: mpegvideo_dec.c:414
FF_CODEC_DECODE_CB
#define FF_CODEC_DECODE_CB(func)
Definition: codec_internal.h:341
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:46
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:41
AV_LOG_DEBUG
#define AV_LOG_DEBUG
Stuff which is only useful for libav* developers.
Definition: log.h:231
decode.h
CODEC_LONG_NAME
#define CODEC_LONG_NAME(str)
Definition: codec_internal.h:326
AVCodecContext::codec_id
enum AVCodecID codec_id
Definition: avcodec.h:441
ff_mpv_common_end
av_cold void ff_mpv_common_end(MpegEncContext *s)
Definition: mpegvideo.c:467
ff_mpv_unref_picture
void ff_mpv_unref_picture(MPVWorkPicture *pic)
Definition: mpegpicture.c:98
RVDecContext::orig_height
int orig_height
Definition: rv10.c:57
AV_ONCE_INIT
#define AV_ONCE_INIT
Definition: thread.h:203
ff_mpv_export_qp_table
int ff_mpv_export_qp_table(const MpegEncContext *s, AVFrame *f, const MPVPicture *p, int qp_type)
Definition: mpegvideo_dec.c:375
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
tmp
static uint8_t tmp[20]
Definition: aes_ctr.c:47
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
ERROR_SKIP_FRAME
#define ERROR_SKIP_FRAME
ff_mpv_decode_close
av_cold int ff_mpv_decode_close(AVCodecContext *avctx)
Definition: mpegvideo_dec.c:128
AV_PICTURE_TYPE_I
@ AV_PICTURE_TYPE_I
Intra.
Definition: avutil.h:278
get_bits1
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:371
ff_set_qscale
void ff_set_qscale(MpegEncContext *s, int qscale)
set qscale and update qscale dependent variables.
Definition: mpegvideo.c:544
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:635
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:545
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
ff_rv20_decoder
const FFCodec ff_rv20_decoder
Definition: rv10.c:644
f
f
Definition: af_crystalizer.c:122
init
int(* init)(AVBSFContext *ctx)
Definition: dts2pts.c:368
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:536
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:276
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:382
size
int size
Definition: twinvq_data.h:10344
VLCElem
Definition: vlc.h:32
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:309
RVDecContext::m
MpegEncContext m
Definition: rv10.c:55
ff_vlc_init_table_from_lengths
av_cold void ff_vlc_init_table_from_lengths(VLCElem table[], int table_size, 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)
Definition: vlc.c:353
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:411
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:221
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:331
ff_print_debug_info
void ff_print_debug_info(const MpegEncContext *s, const MPVPicture *p, AVFrame *pict)
Definition: mpegvideo_dec.c:368
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
Out-of-band global headers that may be used by some codecs.
Definition: avcodec.h:514
show_bits
static unsigned int show_bits(GetBitContext *s, int n)
Show 1-25 bits.
Definition: get_bits.h:354
av_assert1
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:57
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:179
ff_h263_decode_init
av_cold int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:91
ff_rv10_decoder
const FFCodec ff_rv10_decoder
Definition: rv10.c:630
avcodec.h
AVCodecContext::frame_num
int64_t frame_num
Frame counter, set by libavcodec.
Definition: avcodec.h:1878
get_slice_offset
static int get_slice_offset(AVCodecContext *avctx, const uint8_t *buf, int n)
Definition: rv10.c:540
ret
ret
Definition: filter_design.txt:187
SLICE_OK
#define SLICE_OK
Definition: mpegvideo.h:316
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:157
ff_h263_loop_filter
void ff_h263_loop_filter(MpegEncContext *s)
Definition: h263.c:97
ff_mpeg4_init_direct_mv
void ff_mpeg4_init_direct_mv(MpegEncContext *s)
Definition: mpeg4video.c:73
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:431
AV_PICTURE_TYPE_B
@ AV_PICTURE_TYPE_B
Bi-dir predicted.
Definition: avutil.h:280
mpeg4video.h
error_resilience.h
rv_dc_chrom
static VLCElem rv_dc_chrom[992]
Definition: rv10.c:81
ff_mpv_frame_end
void ff_mpv_frame_end(MpegEncContext *s)
Definition: mpegvideo_dec.c:360
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
AV_RL32A
#define AV_RL32A(p)
Definition: intreadwrite.h:568
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:1374
AVCodecContext::coded_width
int coded_width
Bitstream width / height, may be different from width/height e.g.
Definition: avcodec.h:607
AV_PICTURE_TYPE_P
@ AV_PICTURE_TYPE_P
Predicted.
Definition: avutil.h:279
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:200
rv10_decode_init
static av_cold int rv10_decode_init(AVCodecContext *avctx)
Definition: rv10.c:350
avpriv_request_sample
#define avpriv_request_sample(...)
Definition: tableprint_vlc.h:37
ER_MB_END
#define ER_MB_END
Definition: error_resilience.h:37
SLICE_ERROR
#define SLICE_ERROR
Definition: mpegvideo.h:317
MV_DIR_FORWARD
#define MV_DIR_FORWARD
Definition: mpegvideo.h:181
ff_tlog
#define ff_tlog(a,...)
Definition: tableprint_vlc.h:29
AVPacket
This structure stores compressed data.
Definition: packet.h:512
AVCodecContext::priv_data
void * priv_data
Definition: avcodec.h:458
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:64
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