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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 "internal.h"
29 #include "avcodec.h"
30 #include "h264.h"
31 #include "golomb.h"
32 
33 #include <assert.h>
34 
35 static const uint8_t sei_num_clock_ts_table[9] = {
36  1, 1, 1, 2, 2, 3, 3, 2, 3
37 };
38 
40 {
41  h->sei_recovery_frame_cnt = -1;
42  h->sei_dpb_output_delay = 0;
43  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  return 0;
188 }
189 
191 {
192  unsigned int sps_id;
193  int sched_sel_idx;
194  SPS *sps;
195 
196  sps_id = get_ue_golomb_31(&h->gb);
197  if (sps_id > 31 || !h->sps_buffers[sps_id]) {
199  "non-existing SPS %d referenced in buffering period\n", sps_id);
200  return AVERROR_INVALIDDATA;
201  }
202  sps = h->sps_buffers[sps_id];
203 
204  // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
206  for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
207  h->initial_cpb_removal_delay[sched_sel_idx] =
209  // initial_cpb_removal_delay_offset
211  }
212  }
214  for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
215  h->initial_cpb_removal_delay[sched_sel_idx] =
217  // initial_cpb_removal_delay_offset
219  }
220  }
221 
223  return 0;
224 }
225 
226 static int decode_frame_packing(H264Context *h, int size) {
227  int bits = get_bits_left(&h->gb);
228 
235  skip_bits(&h->gb, 1); /* spatial_flipping_flag */
236  skip_bits(&h->gb, 1); /* frame0_flipped_flag */
237  skip_bits(&h->gb, 1); /* field_views_flag */
238  skip_bits(&h->gb, 1); /* current_frame_is_frame0_flag */
239  skip_bits(&h->gb, 1); /* frame0_self_contained_flag */
240  skip_bits(&h->gb, 1); /* frame1_self_contained_flag */
242  skip_bits(&h->gb, 4); /* frame0_grid_position_x */
243  skip_bits(&h->gb, 4); /* frame0_grid_position_y */
244  skip_bits(&h->gb, 4); /* frame1_grid_position_x */
245  skip_bits(&h->gb, 4); /* frame1_grid_position_y */
246  }
247  skip_bits(&h->gb, 8); /* frame_packing_arrangement_reserved_byte */
248  h->sei_fpa.frame_packing_arrangement_repetition_period = get_ue_golomb(&h->gb) /* frame_packing_arrangement_repetition_period */;
249  }
250  skip_bits(&h->gb, 1); /* frame_packing_arrangement_extension_flag */
251 
252  if (h->avctx->debug & FF_DEBUG_PICT_INFO)
253  av_log(h->avctx, AV_LOG_DEBUG, "SEI FPA %d %d %d %d %d %d\n",
260  skip_bits_long(&h->gb, 8 * size - (bits - get_bits_left(&h->gb)));
261  return 0;
262 }
263 
265 {
266  while (get_bits_left(&h->gb) > 16) {
267  int type = 0;
268  unsigned size = 0;
269  unsigned next;
270  int ret = 0;
271 
272  do {
273  if (get_bits_left(&h->gb) < 8)
274  return AVERROR_INVALIDDATA;
275  type += show_bits(&h->gb, 8);
276  } while (get_bits(&h->gb, 8) == 255);
277 
278  do {
279  if (get_bits_left(&h->gb) < 8)
280  return AVERROR_INVALIDDATA;
281  size += show_bits(&h->gb, 8);
282  } while (get_bits(&h->gb, 8) == 255);
283 
285  av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size);
286 
287  if (size > get_bits_left(&h->gb) / 8) {
288  av_log(h->avctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
289  type, 8*size, get_bits_left(&h->gb));
290  return AVERROR_INVALIDDATA;
291  }
292  next = get_bits_count(&h->gb) + 8 * size;
293 
294  switch (type) {
295  case SEI_TYPE_PIC_TIMING: // Picture timing SEI
296  ret = decode_picture_timing(h);
297  if (ret < 0)
298  return ret;
299  break;
301  if (decode_user_data_itu_t_t35(h, size) < 0)
302  return -1;
303  break;
305  ret = decode_unregistered_user_data(h, size);
306  if (ret < 0)
307  return ret;
308  break;
310  ret = decode_recovery_point(h);
311  if (ret < 0)
312  return ret;
313  break;
315  ret = decode_buffering_period(h);
316  if (ret < 0)
317  return ret;
318  break;
320  if (decode_frame_packing(h, size) < 0)
321  return -1;
322  break;
323  default:
324  av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
325  }
326  skip_bits_long(&h->gb, next - get_bits_count(&h->gb));
327 
328  // FIXME check bits here
329  align_get_bits(&h->gb);
330  }
331 
332  return 0;
333 }
334 
336 {
341  return "checkerboard_rl";
342  else
343  return "checkerboard_lr";
346  return "col_interleaved_rl";
347  else
348  return "col_interleaved_lr";
351  return "row_interleaved_rl";
352  else
353  return "row_interleaved_lr";
356  return "right_left";
357  else
358  return "left_right";
361  return "bottom_top";
362  else
363  return "top_bottom";
366  return "block_rl";
367  else
368  return "block_lr";
369  case SEI_FPA_TYPE_2D:
370  default:
371  return "mono";
372  }
373  } else if (h->sei_fpa.frame_packing_arrangement_cancel_flag == 1) {
374  return "mono";
375  } else {
376  return NULL;
377  }
378 }