FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/h264_sei.c
Date: 2024-02-29 09:57:37
Exec Total Coverage
Lines: 128 187 68.4%
Functions: 7 8 87.5%
Branches: 59 108 54.6%

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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 / MPEG-4 part10 SEI decoding.
25 * @author Michael Niedermayer <michaelni@gmx.at>
26 */
27
28 #include <limits.h>
29 #include <stdio.h>
30 #include <string.h>
31 #include "libavutil/error.h"
32 #include "libavutil/log.h"
33 #include "libavutil/macros.h"
34 #include "libavutil/mem.h"
35 #include "bytestream.h"
36 #include "get_bits.h"
37 #include "golomb.h"
38 #include "h264_ps.h"
39 #include "h264_sei.h"
40 #include "sei.h"
41
42 #define AVERROR_PS_NOT_FOUND FFERRTAG(0xF8,'?','P','S')
43
44 static const uint8_t sei_num_clock_ts_table[9] = {
45 1, 1, 1, 2, 2, 3, 3, 2, 3
46 };
47
48 60352 void ff_h264_sei_uninit(H264SEIContext *h)
49 {
50 60352 h->recovery_point.recovery_frame_cnt = -1;
51
52 60352 h->picture_timing.dpb_output_delay = 0;
53 60352 h->picture_timing.cpb_removal_delay = -1;
54
55 60352 h->picture_timing.present = 0;
56 60352 h->buffering_period.present = 0;
57 60352 h->common.frame_packing.present = 0;
58 60352 h->common.film_grain_characteristics.present = 0;
59 60352 h->common.display_orientation.present = 0;
60 60352 h->common.afd.present = 0;
61
62 60352 ff_h2645_sei_reset(&h->common);
63 60352 }
64
65 4417 int ff_h264_sei_process_picture_timing(H264SEIPictureTiming *h, const SPS *sps,
66 void *logctx)
67 {
68 GetBitContext gb;
69 av_unused int ret;
70
71 4417 ret = init_get_bits8(&gb, h->payload, h->payload_size_bytes);
72 av_assert1(ret >= 0);
73
74
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4417 if (sps->nal_hrd_parameters_present_flag ||
75
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1946 sps->vcl_hrd_parameters_present_flag) {
76 2471 h->cpb_removal_delay = get_bits_long(&gb, sps->cpb_removal_delay_length);
77 2471 h->dpb_output_delay = get_bits_long(&gb, sps->dpb_output_delay_length);
78 }
79
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4417 if (sps->pic_struct_present_flag) {
80 unsigned int i, num_clock_ts;
81
82 4397 h->pic_struct = get_bits(&gb, 4);
83 4397 h->ct_type = 0;
84
85
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4397 if (h->pic_struct > H264_SEI_PIC_STRUCT_FRAME_TRIPLING)
86 return AVERROR_INVALIDDATA;
87
88 4397 num_clock_ts = sei_num_clock_ts_table[h->pic_struct];
89 4397 h->timecode_cnt = 0;
90
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11582 for (i = 0; i < num_clock_ts; i++) {
91
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7185 if (get_bits(&gb, 1)) { /* clock_timestamp_flag */
92 1746 H264SEITimeCode *tc = &h->timecode[h->timecode_cnt++];
93 unsigned int full_timestamp_flag;
94 unsigned int counting_type, cnt_dropped_flag;
95 1746 h->ct_type |= 1 << get_bits(&gb, 2);
96 1746 skip_bits(&gb, 1); /* nuit_field_based_flag */
97 1746 counting_type = get_bits(&gb, 5); /* counting_type */
98 1746 full_timestamp_flag = get_bits(&gb, 1);
99 1746 skip_bits(&gb, 1); /* discontinuity_flag */
100 1746 cnt_dropped_flag = get_bits(&gb, 1); /* cnt_dropped_flag */
101
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1746 if (cnt_dropped_flag && counting_type > 1 && counting_type < 7)
102 tc->dropframe = 1;
103 1746 tc->frame = get_bits(&gb, 8); /* n_frames */
104
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1746 if (full_timestamp_flag) {
105 1202 tc->full = 1;
106 1202 tc->seconds = get_bits(&gb, 6); /* seconds_value 0..59 */
107 1202 tc->minutes = get_bits(&gb, 6); /* minutes_value 0..59 */
108 1202 tc->hours = get_bits(&gb, 5); /* hours_value 0..23 */
109 } else {
110 544 tc->seconds = tc->minutes = tc->hours = tc->full = 0;
111
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544 if (get_bits(&gb, 1)) { /* seconds_flag */
112 86 tc->seconds = get_bits(&gb, 6);
113
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86 if (get_bits(&gb, 1)) { /* minutes_flag */
114 tc->minutes = get_bits(&gb, 6);
115 if (get_bits(&gb, 1)) /* hours_flag */
116 tc->hours = get_bits(&gb, 5);
117 }
118 }
119 }
120
121
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1746 if (sps->time_offset_length > 0)
122 1746 skip_bits(&gb,
123 1746 sps->time_offset_length); /* time_offset */
124 }
125 }
126
127 4397 av_log(logctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n",
128 4397 h->ct_type, h->pic_struct);
129 }
130
131 4417 return 0;
132 }
133
134 5546 static int decode_picture_timing(H264SEIPictureTiming *h, GetByteContext *gb,
135 void *logctx)
136 {
137 5546 int size = bytestream2_get_bytes_left(gb);
138
139
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5546 if (size > sizeof(h->payload)) {
140 av_log(logctx, AV_LOG_ERROR, "Picture timing SEI payload too large\n");
141 return AVERROR_INVALIDDATA;
142 }
143 5546 bytestream2_get_bufferu(gb, h->payload, size);
144
145 5546 h->payload_size_bytes = size;
146
147 5546 h->present = 1;
148 5546 return 0;
149 }
150
151 270 static int decode_recovery_point(H264SEIRecoveryPoint *h, GetBitContext *gb, void *logctx)
152 {
153 270 unsigned recovery_frame_cnt = get_ue_golomb_long(gb);
154
155
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270 if (recovery_frame_cnt >= (1<<MAX_LOG2_MAX_FRAME_NUM)) {
156 av_log(logctx, AV_LOG_ERROR, "recovery_frame_cnt %u is out of range\n", recovery_frame_cnt);
157 return AVERROR_INVALIDDATA;
158 }
159
160 270 h->recovery_frame_cnt = recovery_frame_cnt;
161 /* 1b exact_match_flag,
162 * 1b broken_link_flag,
163 * 2b changing_slice_group_idc */
164 270 skip_bits(gb, 4);
165
166 270 return 0;
167 }
168
169 1225 static int decode_buffering_period(H264SEIBufferingPeriod *h, GetBitContext *gb,
170 const H264ParamSets *ps, void *logctx)
171 {
172 unsigned int sps_id;
173 int sched_sel_idx;
174 const SPS *sps;
175
176 1225 sps_id = get_ue_golomb_31(gb);
177
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1225 if (sps_id > 31 || !ps->sps_list[sps_id]) {
178 4 av_log(logctx, AV_LOG_ERROR,
179 "non-existing SPS %d referenced in buffering period\n", sps_id);
180
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4 return sps_id > 31 ? AVERROR_INVALIDDATA : AVERROR_PS_NOT_FOUND;
181 }
182 1221 sps = ps->sps_list[sps_id];
183
184 // NOTE: This is really so duplicated in the standard... See H.264, D.1.1
185
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1221 if (sps->nal_hrd_parameters_present_flag) {
186
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1198 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
187 599 h->initial_cpb_removal_delay[sched_sel_idx] =
188 599 get_bits_long(gb, sps->initial_cpb_removal_delay_length);
189 // initial_cpb_removal_delay_offset
190 599 skip_bits(gb, sps->initial_cpb_removal_delay_length);
191 }
192 }
193
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1221 if (sps->vcl_hrd_parameters_present_flag) {
194
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704 for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) {
195 352 h->initial_cpb_removal_delay[sched_sel_idx] =
196 352 get_bits_long(gb, sps->initial_cpb_removal_delay_length);
197 // initial_cpb_removal_delay_offset
198 352 skip_bits(gb, sps->initial_cpb_removal_delay_length);
199 }
200 }
201
202 1221 h->present = 1;
203 1221 return 0;
204 }
205
206 static int decode_green_metadata(H264SEIGreenMetaData *h, GetByteContext *gb)
207 {
208 h->green_metadata_type = bytestream2_get_byte(gb);
209
210 if (h->green_metadata_type == 0) {
211 h->period_type = bytestream2_get_byte(gb);
212
213 if (h->period_type == 2)
214 h->num_seconds = bytestream2_get_be16(gb);
215 else if (h->period_type == 3)
216 h->num_pictures = bytestream2_get_be16(gb);
217
218 h->percent_non_zero_macroblocks = bytestream2_get_byte(gb);
219 h->percent_intra_coded_macroblocks = bytestream2_get_byte(gb);
220 h->percent_six_tap_filtering = bytestream2_get_byte(gb);
221 h->percent_alpha_point_deblocking_instance = bytestream2_get_byte(gb);
222
223 } else if (h->green_metadata_type == 1) {
224 h->xsd_metric_type = bytestream2_get_byte(gb);
225 h->xsd_metric_value = bytestream2_get_be16(gb);
226 }
227
228 return 0;
229 }
230
231 7083 int ff_h264_sei_decode(H264SEIContext *h, GetBitContext *gb,
232 const H264ParamSets *ps, void *logctx)
233 {
234 GetByteContext gbyte;
235 7083 int master_ret = 0;
236
237 av_assert1((get_bits_count(gb) % 8) == 0);
238 7083 bytestream2_init(&gbyte, gb->buffer + get_bits_count(gb) / 8,
239 7083 get_bits_left(gb) / 8);
240
241
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16070 while (bytestream2_get_bytes_left(&gbyte) > 2 && bytestream2_peek_ne16(&gbyte)) {
242 GetByteContext gbyte_payload;
243 GetBitContext gb_payload;
244 8994 int type = 0;
245 8994 unsigned size = 0;
246 8994 int ret = 0;
247
248 do {
249
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9018 if (bytestream2_get_bytes_left(&gbyte) <= 0)
250 7 return AVERROR_INVALIDDATA;
251 9018 type += bytestream2_peek_byteu(&gbyte);
252
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9018 } while (bytestream2_get_byteu(&gbyte) == 255);
253
254 do {
255
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9276 if (bytestream2_get_bytes_left(&gbyte) <= 0)
256 return AVERROR_INVALIDDATA;
257 9276 size += bytestream2_peek_byteu(&gbyte);
258
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9276 } while (bytestream2_get_byteu(&gbyte) == 255);
259
260
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8994 if (size > bytestream2_get_bytes_left(&gbyte)) {
261 7 av_log(logctx, AV_LOG_ERROR, "SEI type %d size %d truncated at %d\n",
262 type, size, bytestream2_get_bytes_left(&gbyte));
263 7 return AVERROR_INVALIDDATA;
264 }
265
266 8987 bytestream2_init (&gbyte_payload, gbyte.buffer, size);
267 8987 ret = init_get_bits8(&gb_payload, gbyte.buffer, size);
268
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8987 if (ret < 0)
269 return ret;
270
271
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8987 switch (type) {
272 5546 case SEI_TYPE_PIC_TIMING: // Picture timing SEI
273 5546 ret = decode_picture_timing(&h->picture_timing, &gbyte_payload, logctx);
274 5546 break;
275 270 case SEI_TYPE_RECOVERY_POINT:
276 270 ret = decode_recovery_point(&h->recovery_point, &gb_payload, logctx);
277 270 break;
278 1225 case SEI_TYPE_BUFFERING_PERIOD:
279 1225 ret = decode_buffering_period(&h->buffering_period, &gb_payload, ps, logctx);
280 1225 break;
281 case SEI_TYPE_GREEN_METADATA:
282 ret = decode_green_metadata(&h->green_metadata, &gbyte_payload);
283 break;
284 1946 default:
285 1946 ret = ff_h2645_sei_message_decode(&h->common, type, AV_CODEC_ID_H264,
286 &gb_payload, &gbyte_payload, logctx);
287
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1946 if (ret == FF_H2645_SEI_MESSAGE_UNHANDLED)
288 328 av_log(logctx, AV_LOG_DEBUG, "unknown SEI type %d\n", type);
289 }
290
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8987 if (ret < 0 && ret != AVERROR_PS_NOT_FOUND)
291 return ret;
292
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8987 if (ret < 0)
293 4 master_ret = ret;
294
295
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8987 if (get_bits_left(&gb_payload) < 0) {
296 3 av_log(logctx, AV_LOG_WARNING, "SEI type %d overread by %d bits\n",
297 3 type, -get_bits_left(&gb_payload));
298 }
299
300 8987 bytestream2_skipu(&gbyte, size);
301 }
302
303 7076 return master_ret;
304 }
305
306 24313 const char *ff_h264_sei_stereo_mode(const H2645SEIFramePacking *h)
307 {
308
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24313 if (h->arrangement_cancel_flag == 0) {
309 switch (h->arrangement_type) {
310 case SEI_FPA_H264_TYPE_CHECKERBOARD:
311 if (h->content_interpretation_type == 2)
312 return "checkerboard_rl";
313 else
314 return "checkerboard_lr";
315 case SEI_FPA_H264_TYPE_INTERLEAVE_COLUMN:
316 if (h->content_interpretation_type == 2)
317 return "col_interleaved_rl";
318 else
319 return "col_interleaved_lr";
320 case SEI_FPA_H264_TYPE_INTERLEAVE_ROW:
321 if (h->content_interpretation_type == 2)
322 return "row_interleaved_rl";
323 else
324 return "row_interleaved_lr";
325 case SEI_FPA_TYPE_SIDE_BY_SIDE:
326 if (h->content_interpretation_type == 2)
327 return "right_left";
328 else
329 return "left_right";
330 case SEI_FPA_TYPE_TOP_BOTTOM:
331 if (h->content_interpretation_type == 2)
332 return "bottom_top";
333 else
334 return "top_bottom";
335 case SEI_FPA_TYPE_INTERLEAVE_TEMPORAL:
336 if (h->content_interpretation_type == 2)
337 return "block_rl";
338 else
339 return "block_lr";
340 case SEI_FPA_H264_TYPE_2D:
341 default:
342 return "mono";
343 }
344
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24313 } else if (h->arrangement_cancel_flag == 1) {
345 return "mono";
346 } else {
347 24313 return NULL;
348 }
349 }
350