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h264_sei.c
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1 /*
2  * H.26L/H.264/AVC/JVT/14496-10/... sei decoding
3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * H.264 / AVC / MPEG4 part10 sei decoding.
25  * @author Michael Niedermayer <michaelni@gmx.at>
26  */
27 
28 #include "avcodec.h"
29 #include "golomb.h"
30 #include "h264.h"
31 #include "internal.h"
32 
33 static const uint8_t sei_num_clock_ts_table[9] = {
34  1, 1, 1, 2, 2, 3, 3, 2, 3
35 };
36 
38 {
39  h->sei_recovery_frame_cnt = -1;
40  h->sei_dpb_output_delay = 0;
41  h->sei_cpb_removal_delay = -1;
45 }
46 
48 {
49  SPS *sps = &h->sps;
50  int i;
51 
52  for (i = 0; i<MAX_SPS_COUNT; i++)
53  if (!sps->log2_max_frame_num && h->sps_buffers[i])
54  sps = h->sps_buffers[i];
55 
61  }
62  if (sps->pic_struct_present_flag) {
63  unsigned int i, num_clock_ts;
64 
65  h->sei_pic_struct = get_bits(&h->gb, 4);
66  h->sei_ct_type = 0;
67 
69  return AVERROR_INVALIDDATA;
70 
71  num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
72 
73  for (i = 0; i < num_clock_ts; i++) {
74  if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */
75  unsigned int full_timestamp_flag;
76 
77  h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
78  skip_bits(&h->gb, 1); /* nuit_field_based_flag */
79  skip_bits(&h->gb, 5); /* counting_type */
80  full_timestamp_flag = get_bits(&h->gb, 1);
81  skip_bits(&h->gb, 1); /* discontinuity_flag */
82  skip_bits(&h->gb, 1); /* cnt_dropped_flag */
83  skip_bits(&h->gb, 8); /* n_frames */
84  if (full_timestamp_flag) {
85  skip_bits(&h->gb, 6); /* seconds_value 0..59 */
86  skip_bits(&h->gb, 6); /* minutes_value 0..59 */
87  skip_bits(&h->gb, 5); /* hours_value 0..23 */
88  } else {
89  if (get_bits(&h->gb, 1)) { /* seconds_flag */
90  skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
91  if (get_bits(&h->gb, 1)) { /* minutes_flag */
92  skip_bits(&h->gb, 6); /* minutes_value 0..59 */
93  if (get_bits(&h->gb, 1)) /* hours_flag */
94  skip_bits(&h->gb, 5); /* hours_value 0..23 */
95  }
96  }
97  }
98  if (sps->time_offset_length > 0)
99  skip_bits(&h->gb,
100  sps->time_offset_length); /* time_offset */
101  }
102  }
103 
104  if (h->avctx->debug & FF_DEBUG_PICT_INFO)
105  av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
106  h->sei_ct_type, h->sei_pic_struct);
107  }
108  return 0;
109 }
110 
112 {
113  uint32_t user_identifier;
114  int dtg_active_format;
115 
116  if (size < 7)
117  return -1;
118  size -= 7;
119 
120  skip_bits(&h->gb, 8); // country_code
121  skip_bits(&h->gb, 16); // provider_code
122  user_identifier = get_bits_long(&h->gb, 32);
123 
124  switch (user_identifier) {
125  case 0x44544731: // "DTG1" - AFD_data
126  if (size < 1)
127  return -1;
128  skip_bits(&h->gb, 1);
129  if (get_bits(&h->gb, 1)) {
130  skip_bits(&h->gb, 6);
131  if (size < 2)
132  return -1;
133  skip_bits(&h->gb, 4);
134  dtg_active_format = get_bits(&h->gb, 4);
135  h->avctx->dtg_active_format = dtg_active_format;
136  } else {
137  skip_bits(&h->gb, 6);
138  }
139  break;
140  default:
141  skip_bits(&h->gb, size * 8);
142  break;
143  }
144 
145  return 0;
146 }
147 
149 {
150  uint8_t user_data[16 + 256];
151  int e, build, i;
152 
153  if (size < 16)
154  return AVERROR_INVALIDDATA;
155 
156  for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
157  user_data[i] = get_bits(&h->gb, 8);
158 
159  user_data[i] = 0;
160  e = sscanf(user_data + 16, "x264 - core %d", &build);
161  if (e == 1 && build > 0)
162  h->x264_build = build;
163  if (e == 1 && build == 1 && !strncmp(user_data+16, "x264 - core 0000", 16))
164  h->x264_build = 67;
165 
166  if (h->avctx->debug & FF_DEBUG_BUGS)
167  av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
168 
169  for (; i < size; i++)
170  skip_bits(&h->gb, 8);
171 
172  return 0;
173 }
174 
176 {
178 
179  /* 1b exact_match_flag,
180  * 1b broken_link_flag,
181  * 2b changing_slice_group_idc */
182  skip_bits(&h->gb, 4);
183 
184  if (h->avctx->debug & FF_DEBUG_PICT_INFO)
185  av_log(h->avctx, AV_LOG_DEBUG, "sei_recovery_frame_cnt: %d\n", h->sei_recovery_frame_cnt);
186 
187  h->has_recovery_point = 1;
188 
189  return 0;
190 }
191 
193 {
194  unsigned int sps_id;
195  int sched_sel_idx;
196  SPS *sps;
197 
198  sps_id = get_ue_golomb_31(&h->gb);
199  if (sps_id > 31 || !h->sps_buffers[sps_id]) {
201  "non-existing SPS %d referenced in buffering period\n", sps_id);
202  return AVERROR_INVALIDDATA;
203  }
204  sps = h->sps_buffers[sps_id];
205 
206  // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
208  for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
209  h->initial_cpb_removal_delay[sched_sel_idx] =
211  // initial_cpb_removal_delay_offset
213  }
214  }
216  for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
217  h->initial_cpb_removal_delay[sched_sel_idx] =
219  // initial_cpb_removal_delay_offset
221  }
222  }
223 
225  return 0;
226 }
227 
229 {
233 
234  if (h->sei_frame_packing_present) {
241 
242  // the following skips: spatial_flipping_flag, frame0_flipped_flag,
243  // field_views_flag, current_frame_is_frame0_flag,
244  // frame0_self_contained_flag, frame1_self_contained_flag
245  skip_bits(&h->gb, 6);
246 
248  skip_bits(&h->gb, 16); // frame[01]_grid_position_[xy]
249  skip_bits(&h->gb, 8); // frame_packing_arrangement_reserved_byte
250  h->sei_fpa.frame_packing_arrangement_repetition_period = get_ue_golomb(&h->gb) /* frame_packing_arrangement_repetition_period */;
251  }
252  skip_bits1(&h->gb); // frame_packing_arrangement_extension_flag
253 
254  if (h->avctx->debug & FF_DEBUG_PICT_INFO)
255  av_log(h->avctx, AV_LOG_DEBUG, "SEI FPA %d %d %d %d %d %d\n",
262 
263  return 0;
264 }
265 
267 {
269 
271  h->sei_hflip = get_bits1(&h->gb); // hor_flip
272  h->sei_vflip = get_bits1(&h->gb); // ver_flip
273 
274  h->sei_anticlockwise_rotation = get_bits(&h->gb, 16);
275  get_ue_golomb(&h->gb); // display_orientation_repetition_period
276  skip_bits1(&h->gb); // display_orientation_extension_flag
277  }
278 
279  return 0;
280 }
281 
283 {
284  while (get_bits_left(&h->gb) > 16) {
285  int type = 0;
286  unsigned size = 0;
287  unsigned next;
288  int ret = 0;
289 
290  do {
291  if (get_bits_left(&h->gb) < 8)
292  return AVERROR_INVALIDDATA;
293  type += show_bits(&h->gb, 8);
294  } while (get_bits(&h->gb, 8) == 255);
295 
296  do {
297  if (get_bits_left(&h->gb) < 8)
298  return AVERROR_INVALIDDATA;
299  size += show_bits(&h->gb, 8);
300  } while (get_bits(&h->gb, 8) == 255);
301 
303  av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
304 
305  if (size > get_bits_left(&h->gb) / 8) {
306  av_log(h->avctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
307  type, 8*size, get_bits_left(&h->gb));
308  return AVERROR_INVALIDDATA;
309  }
310  next = get_bits_count(&h->gb) + 8 * size;
311 
312  switch (type) {
313  case SEI_TYPE_PIC_TIMING: // Picture timing SEI
314  ret = decode_picture_timing(h);
315  if (ret < 0)
316  return ret;
317  break;
319  if (decode_user_data_itu_t_t35(h, size) < 0)
320  return -1;
321  break;
323  ret = decode_unregistered_user_data(h, size);
324  if (ret < 0)
325  return ret;
326  break;
328  ret = decode_recovery_point(h);
329  if (ret < 0)
330  return ret;
331  break;
333  ret = decode_buffering_period(h);
334  if (ret < 0)
335  return ret;
336  break;
339  if (ret < 0)
340  return ret;
341  break;
344  if (ret < 0)
345  return ret;
346  break;
347  default:
348  av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
349  }
350  skip_bits_long(&h->gb, next - get_bits_count(&h->gb));
351 
352  // FIXME check bits here
353  align_get_bits(&h->gb);
354  }
355 
356  return 0;
357 }
358 
360 {
365  return "checkerboard_rl";
366  else
367  return "checkerboard_lr";
370  return "col_interleaved_rl";
371  else
372  return "col_interleaved_lr";
375  return "row_interleaved_rl";
376  else
377  return "row_interleaved_lr";
380  return "right_left";
381  else
382  return "left_right";
385  return "bottom_top";
386  else
387  return "top_bottom";
390  return "block_rl";
391  else
392  return "block_lr";
393  case SEI_FPA_TYPE_2D:
394  default:
395  return "mono";
396  }
397  } else if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 1) {
398  return "mono";
399  } else {
400  return NULL;
401  }
402 }