asfdec: remove improper assignement that caused wrong timestamps
[libav.git] / libavcodec / h264_sei.c
CommitLineData
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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 *
2912e87a 5 * This file is part of Libav.
9c095463 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
ba87f080 23 * @file
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24 * H.264 / AVC / MPEG4 part10 sei decoding.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
9c095463 28#include "avcodec.h"
9c095463 29#include "golomb.h"
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30#include "h264.h"
31#include "internal.h"
9c095463 32
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33static const uint8_t sei_num_clock_ts_table[9] = {
34 1, 1, 1, 2, 2, 3, 3, 2, 3
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35};
36
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37void ff_h264_reset_sei(H264Context *h)
38{
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39 h->sei_recovery_frame_cnt = -1;
40 h->sei_dpb_output_delay = 0;
41 h->sei_cpb_removal_delay = -1;
42 h->sei_buffering_period_present = 0;
5b10ef72 43 h->sei_frame_packing_present = 0;
18e3d61e 44 h->sei_display_orientation_present = 0;
271ce76d 45 h->sei_reguserdata_afd_present = 0;
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46
47 h->a53_caption_size = 0;
48 av_freep(&h->a53_caption);
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49}
50
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51static int decode_picture_timing(H264Context *h)
52{
53 if (h->sps.nal_hrd_parameters_present_flag ||
54 h->sps.vcl_hrd_parameters_present_flag) {
55 h->sei_cpb_removal_delay = get_bits(&h->gb,
56 h->sps.cpb_removal_delay_length);
57 h->sei_dpb_output_delay = get_bits(&h->gb,
58 h->sps.dpb_output_delay_length);
9c095463 59 }
b1841217 60 if (h->sps.pic_struct_present_flag) {
9c095463 61 unsigned int i, num_clock_ts;
b1841217 62
2c541554 63 h->sei_pic_struct = get_bits(&h->gb, 4);
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64 h->sei_ct_type = 0;
65
66 if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING)
0d8b943d 67 return AVERROR_INVALIDDATA;
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68
69 num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct];
70
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71 for (i = 0; i < num_clock_ts; i++) {
72 if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */
9c095463 73 unsigned int full_timestamp_flag;
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74
75 h->sei_ct_type |= 1 << get_bits(&h->gb, 2);
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76 skip_bits(&h->gb, 1); /* nuit_field_based_flag */
77 skip_bits(&h->gb, 5); /* counting_type */
78 full_timestamp_flag = get_bits(&h->gb, 1);
79 skip_bits(&h->gb, 1); /* discontinuity_flag */
80 skip_bits(&h->gb, 1); /* cnt_dropped_flag */
81 skip_bits(&h->gb, 8); /* n_frames */
b1841217 82 if (full_timestamp_flag) {
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83 skip_bits(&h->gb, 6); /* seconds_value 0..59 */
84 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
85 skip_bits(&h->gb, 5); /* hours_value 0..23 */
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86 } else {
87 if (get_bits(&h->gb, 1)) { /* seconds_flag */
2c541554 88 skip_bits(&h->gb, 6); /* seconds_value range 0..59 */
b1841217 89 if (get_bits(&h->gb, 1)) { /* minutes_flag */
2c541554 90 skip_bits(&h->gb, 6); /* minutes_value 0..59 */
b1841217 91 if (get_bits(&h->gb, 1)) /* hours_flag */
2c541554 92 skip_bits(&h->gb, 5); /* hours_value 0..23 */
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93 }
94 }
95 }
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96 if (h->sps.time_offset_length > 0)
97 skip_bits(&h->gb,
98 h->sps.time_offset_length); /* time_offset */
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99 }
100 }
101
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102 if (h->avctx->debug & FF_DEBUG_PICT_INFO)
103 av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
104 h->sei_ct_type, h->sei_pic_struct);
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105 }
106 return 0;
107}
108
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109static int decode_registered_user_data(H264Context *h, int size)
110{
111 uint32_t country_code;
112 uint32_t user_identifier;
b0017579 113 int flag, user_data_type_code, cc_count;
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114
115 if (size < 7)
116 return AVERROR_INVALIDDATA;
117 size -= 7;
118
119 country_code = get_bits(&h->gb, 8); // itu_t_t35_country_code
120 if (country_code == 0xFF) {
121 skip_bits(&h->gb, 8); // itu_t_t35_country_code_extension_byte
122 size--;
123 }
124
125 /* itu_t_t35_payload_byte follows */
126 skip_bits(&h->gb, 8); // terminal provider code
127 skip_bits(&h->gb, 8); // terminal provider oriented code
128 user_identifier = get_bits_long(&h->gb, 32);
129
130 switch (user_identifier) {
131 case MKBETAG('D', 'T', 'G', '1'): // afd_data
132 if (size-- < 1)
133 return AVERROR_INVALIDDATA;
134 skip_bits(&h->gb, 1); // 0
135 flag = get_bits(&h->gb, 1); // active_format_flag
136 skip_bits(&h->gb, 6); // reserved
137
138 if (flag) {
139 if (size-- < 1)
140 return AVERROR_INVALIDDATA;
141 skip_bits(&h->gb, 4); // reserved
142 h->active_format_description = get_bits(&h->gb, 4);
143 h->sei_reguserdata_afd_present = 1;
144 }
145 break;
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146 case MKBETAG('G', 'A', '9', '4'): // closed captions
147 if (size < 3)
148 return AVERROR(EINVAL);
149
150 user_data_type_code = get_bits(&h->gb, 8);
151 if (user_data_type_code == 0x3) {
152 skip_bits(&h->gb, 1); // reserved
153
154 flag = get_bits(&h->gb, 1); // process_cc_data_flag
155 if (flag) {
156 skip_bits(&h->gb, 1); // zero bit
157 cc_count = get_bits(&h->gb, 5);
158 skip_bits(&h->gb, 8); // reserved
159 size -= 2;
160
161 if (cc_count && size >= cc_count * 3) {
162 int i, ret;
163 int new_size = (int64_t) h->a53_caption_size +
164 (int64_t) cc_count * 3;
165
166 if (new_size > INT_MAX)
167 return AVERROR(EINVAL);
168
169 /* Allow merging of the cc data from two fields. */
170 ret = av_reallocp(&h->a53_caption,
171 h->a53_caption_size + cc_count * 3);
172 if (ret < 0)
173 return ret;
174
175 for (i = 0; i < cc_count; i++) {
176 h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
177 h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
178 h->a53_caption[h->a53_caption_size++] = get_bits(&h->gb, 8);
179 }
180
181 skip_bits(&h->gb, 8); // marker_bits
182 }
183 }
184 }
185 break;
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186 default:
187 skip_bits(&h->gb, size * 8);
188 break;
189 }
190
191 return 0;
192}
193
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194static int decode_unregistered_user_data(H264Context *h, int size)
195{
196 uint8_t user_data[16 + 256];
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197 int e, build, i;
198
b1841217 199 if (size < 16)
0d8b943d 200 return AVERROR_INVALIDDATA;
9c095463 201
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202 for (i = 0; i < sizeof(user_data) - 1 && i < size; i++)
203 user_data[i] = get_bits(&h->gb, 8);
9c095463 204
b1841217 205 user_data[i] = 0;
4c7fd58f 206 e = sscanf(user_data + 16, "x264 - core %d", &build);
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207 if (e == 1 && build > 0)
208 h->x264_build = build;
9c095463 209
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210 if (h->avctx->debug & FF_DEBUG_BUGS)
211 av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data + 16);
9c095463 212
b1841217 213 for (; i < size; i++)
2c541554 214 skip_bits(&h->gb, 8);
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215
216 return 0;
217}
218
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219static int decode_recovery_point(H264Context *h)
220{
2c541554 221 h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb);
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222
223 /* 1b exact_match_flag,
224 * 1b broken_link_flag,
225 * 2b changing_slice_group_idc */
226 skip_bits(&h->gb, 4);
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227
228 return 0;
229}
230
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231static int decode_buffering_period(H264Context *h)
232{
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233 unsigned int sps_id;
234 int sched_sel_idx;
235 SPS *sps;
236
2c541554 237 sps_id = get_ue_golomb_31(&h->gb);
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238 if (sps_id > 31 || !h->sps_buffers[sps_id]) {
239 av_log(h->avctx, AV_LOG_ERROR,
240 "non-existing SPS %d referenced in buffering period\n", sps_id);
0d8b943d 241 return AVERROR_INVALIDDATA;
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242 }
243 sps = h->sps_buffers[sps_id];
244
245 // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
246 if (sps->nal_hrd_parameters_present_flag) {
247 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
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248 h->initial_cpb_removal_delay[sched_sel_idx] =
249 get_bits(&h->gb, sps->initial_cpb_removal_delay_length);
250 // initial_cpb_removal_delay_offset
251 skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
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252 }
253 }
254 if (sps->vcl_hrd_parameters_present_flag) {
255 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
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256 h->initial_cpb_removal_delay[sched_sel_idx] =
257 get_bits(&h->gb, sps->initial_cpb_removal_delay_length);
258 // initial_cpb_removal_delay_offset
259 skip_bits(&h->gb, sps->initial_cpb_removal_delay_length);
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260 }
261 }
262
263 h->sei_buffering_period_present = 1;
264 return 0;
265}
266
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267static int decode_frame_packing_arrangement(H264Context *h)
268{
5b10ef72 269 get_ue_golomb(&h->gb); // frame_packing_arrangement_id
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270 h->sei_frame_packing_present = !get_bits1(&h->gb);
271
272 if (h->sei_frame_packing_present) {
273 h->frame_packing_arrangement_type = get_bits(&h->gb, 7);
274 h->quincunx_subsampling = get_bits1(&h->gb);
275 h->content_interpretation_type = get_bits(&h->gb, 6);
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276
277 // the following skips: spatial_flipping_flag, frame0_flipped_flag,
278 // field_views_flag, current_frame_is_frame0_flag,
279 // frame0_self_contained_flag, frame1_self_contained_flag
280 skip_bits(&h->gb, 6);
281
3d9fc21e 282 if (!h->quincunx_subsampling && h->frame_packing_arrangement_type != 5)
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283 skip_bits(&h->gb, 16); // frame[01]_grid_position_[xy]
284 skip_bits(&h->gb, 8); // frame_packing_arrangement_reserved_byte
285 get_ue_golomb(&h->gb); // frame_packing_arrangement_repetition_period
286 }
287 skip_bits1(&h->gb); // frame_packing_arrangement_extension_flag
288
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289 return 0;
290}
291
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292static int decode_display_orientation(H264Context *h)
293{
294 h->sei_display_orientation_present = !get_bits1(&h->gb);
295
296 if (h->sei_display_orientation_present) {
297 h->sei_hflip = get_bits1(&h->gb); // hor_flip
298 h->sei_vflip = get_bits1(&h->gb); // ver_flip
299
300 h->sei_anticlockwise_rotation = get_bits(&h->gb, 16);
301 get_ue_golomb(&h->gb); // display_orientation_repetition_period
302 skip_bits1(&h->gb); // display_orientation_extension_flag
303 }
304
305 return 0;
306}
307
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308int ff_h264_decode_sei(H264Context *h)
309{
2c541554 310 while (get_bits_left(&h->gb) > 16) {
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311 int size = 0;
312 int type = 0;
0d8b943d 313 int ret = 0;
7ab551f9 314 int last = 0;
9c095463 315
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316 while (get_bits_left(&h->gb) >= 8 &&
317 (last = get_bits(&h->gb, 8)) == 255) {
318 type += 255;
319 }
320 type += last;
9c095463 321
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322 last = 0;
323 while (get_bits_left(&h->gb) >= 8 &&
324 (last = get_bits(&h->gb, 8)) == 255) {
325 size += 255;
326 }
327 size += last;
9c095463 328
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329 if (size > get_bits_left(&h->gb) / 8) {
330 av_log(h->avctx, AV_LOG_ERROR, "SEI type %d truncated at %d\n",
331 type, get_bits_left(&h->gb));
332 return AVERROR_INVALIDDATA;
333 }
334
b1841217 335 switch (type) {
9c095463 336 case SEI_TYPE_PIC_TIMING: // Picture timing SEI
0d8b943d 337 ret = decode_picture_timing(h);
9c095463 338 break;
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339 case SEI_TYPE_USER_DATA_REGISTERED:
340 ret = decode_registered_user_data(h, size);
341 break;
9c095463 342 case SEI_TYPE_USER_DATA_UNREGISTERED:
0d8b943d 343 ret = decode_unregistered_user_data(h, size);
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344 break;
345 case SEI_TYPE_RECOVERY_POINT:
0d8b943d 346 ret = decode_recovery_point(h);
9c095463 347 break;
304e916a 348 case SEI_TYPE_BUFFERING_PERIOD:
0d8b943d 349 ret = decode_buffering_period(h);
9c095463 350 break;
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351 case SEI_TYPE_FRAME_PACKING:
352 ret = decode_frame_packing_arrangement(h);
5b10ef72 353 break;
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354 case SEI_TYPE_DISPLAY_ORIENTATION:
355 ret = decode_display_orientation(h);
18e3d61e 356 break;
9c095463 357 default:
26179964 358 av_log(h->avctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
b1841217 359 skip_bits(&h->gb, 8 * size);
9c095463 360 }
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361 if (ret < 0)
362 return ret;
9c095463 363
b1841217 364 // FIXME check bits here
2c541554 365 align_get_bits(&h->gb);
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366 }
367
368 return 0;
369}