FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/nutdec.c
Date: 2026-10-15 16:30:37
Exec Total Coverage
Lines: 544 850 64.0%
Functions: 21 23 91.3%
Branches: 314 574 54.7%
Line Branch Exec Source
1 /*
2 * "NUT" Container Format demuxer
3 * Copyright (c) 2004-2006 Michael Niedermayer
4 * Copyright (c) 2003 Alex Beregszaszi
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 #include "libavutil/attributes.h"
24 #include "libavutil/avstring.h"
25 #include "libavutil/avassert.h"
26 #include "libavutil/bswap.h"
27 #include "libavutil/dict.h"
28 #include "libavutil/intreadwrite.h"
29 #include "libavutil/mathematics.h"
30 #include "libavutil/mem.h"
31 #include "libavutil/tree.h"
32 #include "libavcodec/bytestream.h"
33 #include "avio_internal.h"
34 #include "demux.h"
35 #include "isom.h"
36 #include "nut.h"
37 #include "riff.h"
38
39 static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
40 int64_t *pos_arg, int64_t pos_limit);
41
42 892 static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)
43 {
44 892 unsigned int len = ffio_read_varlen(bc);
45
46
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 892 if (len && maxlen)
47 892 avio_read(bc, string, FFMIN(len, maxlen));
48
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 892 while (len > maxlen) {
49 ✗ avio_r8(bc);
50 ✗ len--;
51 ✗ if (bc->eof_reached)
52 ✗ len = maxlen;
53 }
54
55
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 892 if (maxlen)
56 892 string[FFMIN(len, maxlen - 1)] = 0;
57
58
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 892 if (bc->eof_reached)
59 ✗ return AVERROR_EOF;
60
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 892 if (maxlen == len)
61 ✗ return -1;
62 else
63 892 return 0;
64 }
65
66 1258 static int64_t get_s(AVIOContext *bc)
67 {
68 1258 int64_t v = ffio_read_varlen(bc) + 1;
69
70
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 1258 if (v & 1)
71 921 return -(v >> 1);
72 else
73 337 return (v >> 1);
74 }
75
76 91 static uint64_t get_fourcc(AVIOContext *bc)
77 {
78 91 unsigned int len = ffio_read_varlen(bc);
79
80
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 91 if (len == 2)
81 ✗ return avio_rl16(bc);
82
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 91 else if (len == 4)
83 91 return avio_rl32(bc);
84 else {
85 ✗ av_log(NULL, AV_LOG_ERROR, "Unsupported fourcc length %d\n", len);
86 ✗ return -1;
87 }
88 }
89
90 1402 static int get_packetheader(NUTContext *nut, AVIOContext *bc,
91 int calculate_checksum, uint64_t startcode)
92 {
93 int64_t size;
94
95 1402 startcode = av_be2ne64(startcode);
96 1402 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
97
98 1402 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
99 1402 size = ffio_read_varlen(bc);
100
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 1402 if (size > 4096)
101 ✗ avio_rb32(bc);
102
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 1402 if (ffio_get_checksum(bc) && size > 4096)
103 ✗ return -1;
104
105
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 1402 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
106
107 1402 return size;
108 }
109
110 684 static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
111 {
112 684 uint64_t state = 0;
113
114
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 684 if (pos >= 0)
115 /* Note, this may fail if the stream is not seekable, but that should
116 * not matter, as in this case we simply start where we currently are */
117 615 avio_seek(bc, pos, SEEK_SET);
118
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 40949 while (!avio_feof(bc)) {
119 40949 state = (state << 8) | avio_r8(bc);
120
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 40949 if ((state >> 56) != 'N')
121 40176 continue;
122
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 773 switch (state) {
123 684 case MAIN_STARTCODE:
124 case STREAM_STARTCODE:
125 case SYNCPOINT_STARTCODE:
126 case INFO_STARTCODE:
127 case INDEX_STARTCODE:
128 684 return state;
129 }
130 }
131
132 ✗ return 0;
133 }
134
135 /**
136 * Find the given startcode.
137 * @param code the startcode
138 * @param pos the start position of the search, or -1 if the current position
139 * @return the position of the startcode or -1 if not found
140 */
141 186 static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
142 {
143 69 for (;;) {
144 255 uint64_t startcode = find_any_startcode(bc, pos);
145
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 255 if (startcode == code)
146 186 return avio_tell(bc) - 8;
147
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 69 else if (startcode == 0)
148 ✗ return -1;
149 69 pos = -1;
150 }
151 }
152
153 8162 static int nut_probe(const AVProbeData *p)
154 {
155 int i;
156
157
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 514907741 for (i = 0; i < p->buf_size-8; i++) {
158
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 514899648 if (AV_RB32(p->buf+i) != MAIN_STARTCODE>>32)
159 514899579 continue;
160
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 69 if (AV_RB32(p->buf+i+4) == (MAIN_STARTCODE & 0xFFFFFFFF))
161 69 return AVPROBE_SCORE_MAX;
162 }
163 8093 return 0;
164 }
165
166 #define GET_V(dst, check) \
167 do { \
168 tmp = ffio_read_varlen(bc); \
169 if (!(check)) { \
170 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
171 ret = AVERROR_INVALIDDATA; \
172 goto fail; \
173 } \
174 dst = tmp; \
175 } while (0)
176
177 1342 static int skip_reserved(AVIOContext *bc, int64_t pos)
178 {
179 1342 pos -= avio_tell(bc);
180
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 1342 if (pos < 0) {
181 ✗ avio_seek(bc, pos, SEEK_CUR);
182 ✗ return AVERROR_INVALIDDATA;
183 } else {
184
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 7262 while (pos--) {
185
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 5920 if (bc->eof_reached)
186 ✗ return AVERROR_INVALIDDATA;
187 5920 avio_r8(bc);
188 }
189 1342 return 0;
190 }
191 }
192
193 69 static int decode_main_header(NUTContext *nut)
194 {
195 69 AVFormatContext *s = nut->avf;
196 69 AVIOContext *bc = s->pb;
197 uint64_t tmp, end, length;
198 unsigned int stream_count;
199 int i, j, count, ret;
200 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
201
202 69 length = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
203
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 69 if (length == (uint64_t)-1)
204 ✗ return AVERROR_INVALIDDATA;
205 69 end = length + avio_tell(bc);
206
207 69 nut->version = ffio_read_varlen(bc);
208
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 69 if (nut->version < NUT_MIN_VERSION ||
209
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 69 nut->version > NUT_MAX_VERSION) {
210 ✗ av_log(s, AV_LOG_ERROR, "Version %d not supported.\n",
211 nut->version);
212 ✗ return AVERROR(ENOSYS);
213 }
214
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 69 if (nut->version > 3)
215 2 nut->minor_version = ffio_read_varlen(bc);
216
217
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 69 GET_V(stream_count, tmp > 0 && tmp <= s->max_streams);
218
219 69 nut->max_distance = ffio_read_varlen(bc);
220
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 69 if (nut->max_distance > 65536) {
221 ✗ av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
222 ✗ nut->max_distance = 65536;
223 }
224
225
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 69 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational) && tmp < length/2);
226 69 nut->time_base = av_malloc_array(nut->time_base_count, sizeof(AVRational));
227
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 69 if (!nut->time_base)
228 ✗ return AVERROR(ENOMEM);
229
230
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 172 for (i = 0; i < nut->time_base_count; i++) {
231
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 103 GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31));
232
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 103 GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31));
233
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 103 if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
234 ✗ av_log(s, AV_LOG_ERROR, "invalid time base %d/%d\n",
235 ✗ nut->time_base[i].num,
236 ✗ nut->time_base[i].den);
237 ✗ ret = AVERROR_INVALIDDATA;
238 ✗ goto fail;
239 }
240 }
241 69 tmp_pts = 0;
242 69 tmp_mul = 1;
243 69 tmp_stream = 0;
244 69 tmp_head_idx = 0;
245
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 770 for (i = 0; i < 256;) {
246 701 int tmp_flags = ffio_read_varlen(bc);
247 701 int tmp_fields = ffio_read_varlen(bc);
248
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 701 if (tmp_fields < 0) {
249 ✗ av_log(s, AV_LOG_ERROR, "fields %d is invalid\n", tmp_fields);
250 ✗ ret = AVERROR_INVALIDDATA;
251 ✗ goto fail;
252 }
253
254
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 701 if (tmp_fields > 0)
255 610 tmp_pts = get_s(bc);
256
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 701 if (tmp_fields > 1)
257 407 tmp_mul = ffio_read_varlen(bc);
258
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 701 if (tmp_fields > 2)
259 206 tmp_stream = ffio_read_varlen(bc);
260
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 701 if (tmp_fields > 3)
261 186 tmp_size = ffio_read_varlen(bc);
262 else
263 515 tmp_size = 0;
264
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 701 if (tmp_fields > 4)
265 140 tmp_res = ffio_read_varlen(bc);
266 else
267 561 tmp_res = 0;
268
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 701 if (tmp_fields > 5)
269 140 count = ffio_read_varlen(bc);
270 else
271 561 count = tmp_mul - (unsigned)tmp_size;
272
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 701 if (tmp_fields > 6)
273 2 get_s(bc);
274
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 701 if (tmp_fields > 7)
275 2 tmp_head_idx = ffio_read_varlen(bc);
276
277
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 701 while (tmp_fields-- > 8) {
278 ✗ if (bc->eof_reached) {
279 ✗ av_log(s, AV_LOG_ERROR, "reached EOF while decoding main header\n");
280 ✗ ret = AVERROR_INVALIDDATA;
281 ✗ goto fail;
282 }
283 ✗ ffio_read_varlen(bc);
284 }
285
286
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 701 if (count <= 0 || count > 256 - (i <= 'N') - i) {
287 ✗ av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
288 ✗ ret = AVERROR_INVALIDDATA;
289 ✗ goto fail;
290 }
291
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 701 if (tmp_stream >= stream_count) {
292 ✗ av_log(s, AV_LOG_ERROR, "illegal stream number %d >= %d\n",
293 tmp_stream, stream_count);
294 ✗ ret = AVERROR_INVALIDDATA;
295 ✗ goto fail;
296 }
297
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 701 if (tmp_size < 0 || tmp_size > INT_MAX - count) {
298 ✗ av_log(s, AV_LOG_ERROR, "illegal size\n");
299 ✗ ret = AVERROR_INVALIDDATA;
300 ✗ goto fail;
301 }
302
303
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 18365 for (j = 0; j < count; j++, i++) {
304
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 17664 if (i == 'N') {
305 69 nut->frame_code[i].flags = FLAG_INVALID;
306 69 j--;
307 69 continue;
308 }
309 17595 nut->frame_code[i].flags = tmp_flags;
310 17595 nut->frame_code[i].pts_delta = tmp_pts;
311 17595 nut->frame_code[i].stream_id = tmp_stream;
312 17595 nut->frame_code[i].size_mul = tmp_mul;
313 17595 nut->frame_code[i].size_lsb = tmp_size + j;
314 17595 nut->frame_code[i].reserved_count = tmp_res;
315 17595 nut->frame_code[i].header_idx = tmp_head_idx;
316 }
317 }
318
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 69 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
319
320
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 69 if (end > avio_tell(bc) + 4) {
321 69 int rem = 1024;
322
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 69 GET_V(nut->header_count, tmp < 128U);
323 69 nut->header_count++;
324
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 483 for (i = 1; i < nut->header_count; i++) {
325 uint8_t *hdr;
326
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 414 GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
327
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 414 if (rem < nut->header_len[i]) {
328 ✗ av_log(s, AV_LOG_ERROR,
329 "invalid elision header %d : %d > %d\n",
330 ✗ i, nut->header_len[i], rem);
331 ✗ ret = AVERROR_INVALIDDATA;
332 ✗ goto fail;
333 }
334 414 rem -= nut->header_len[i];
335 414 hdr = av_malloc(nut->header_len[i]);
336
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 414 if (!hdr) {
337 ✗ ret = AVERROR(ENOMEM);
338 ✗ goto fail;
339 }
340 414 avio_read(bc, hdr, nut->header_len[i]);
341 414 nut->header[i] = hdr;
342 }
343
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 69 av_assert0(nut->header_len[0] == 0);
344 }
345
346 // flags had been effectively introduced in version 4
347
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 69 if (nut->version > 3 && end > avio_tell(bc) + 4) {
348 2 nut->flags = ffio_read_varlen(bc);
349 }
350
351
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 69 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
352 ✗ av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
353 ✗ ret = AVERROR_INVALIDDATA;
354 ✗ goto fail;
355 }
356
357 69 nut->stream = av_calloc(stream_count, sizeof(StreamContext));
358
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 69 if (!nut->stream) {
359 ✗ ret = AVERROR(ENOMEM);
360 ✗ goto fail;
361 }
362
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 160 for (i = 0; i < stream_count; i++) {
363
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 91 if (!avformat_new_stream(s, NULL)) {
364 ✗ ret = AVERROR(ENOMEM);
365 ✗ goto fail;
366 }
367 }
368
369 69 return 0;
370 ✗ fail:
371 ✗ av_freep(&nut->time_base);
372 ✗ for (i = 1; i < nut->header_count; i++) {
373 ✗ av_freep(&nut->header[i]);
374 }
375 ✗ nut->header_count = 0;
376 ✗ return ret;
377 }
378
379 91 static int decode_stream_header(NUTContext *nut)
380 {
381 91 AVFormatContext *s = nut->avf;
382 91 AVIOContext *bc = s->pb;
383 StreamContext *stc;
384 int class, stream_id, ret;
385 uint64_t tmp, end;
386 91 AVStream *st = NULL;
387
388 91 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
389 91 end += avio_tell(bc);
390
391
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 91 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
392 91 stc = &nut->stream[stream_id];
393 91 st = s->streams[stream_id];
394
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 91 if (!st)
395 ✗ return AVERROR(ENOMEM);
396
397 91 class = ffio_read_varlen(bc);
398 91 tmp = get_fourcc(bc);
399 91 st->codecpar->codec_tag = tmp;
400
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 91 switch (class) {
401 49 case 0:
402 49 st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
403 49 st->codecpar->codec_id = av_codec_get_id((const AVCodecTag * const []) {
404 ff_nut_video_tags,
405 ff_codec_bmp_tags,
406 ff_codec_movvideo_tags,
407 0
408 },
409 tmp);
410 49 break;
411 42 case 1:
412 42 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
413 42 st->codecpar->codec_id = av_codec_get_id((const AVCodecTag * const []) {
414 ff_nut_audio_tags,
415 ff_codec_wav_tags,
416 ff_nut_audio_extra_tags,
417 0
418 },
419 tmp);
420 42 break;
421 ✗ case 2:
422 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
423 ✗ st->codecpar->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
424 ✗ break;
425 ✗ case 3:
426 ✗ st->codecpar->codec_type = AVMEDIA_TYPE_DATA;
427 ✗ st->codecpar->codec_id = ff_codec_get_id(ff_nut_data_tags, tmp);
428 ✗ break;
429 ✗ default:
430 ✗ av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
431 ✗ return AVERROR(ENOSYS);
432 }
433
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 91 if (class < 3 && st->codecpar->codec_id == AV_CODEC_ID_NONE)
434 ✗ av_log(s, AV_LOG_ERROR,
435 "Unknown codec tag '0x%04x' for stream number %d\n",
436 (unsigned int) tmp, stream_id);
437
438
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 91 GET_V(stc->time_base_id, tmp < nut->time_base_count);
439
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 91 GET_V(stc->msb_pts_shift, tmp < 16);
440 91 stc->max_pts_distance = ffio_read_varlen(bc);
441
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 91 GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
442 91 st->codecpar->video_delay = stc->decode_delay;
443 91 ffio_read_varlen(bc); // stream flags
444
445
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 91 GET_V(st->codecpar->extradata_size, tmp < (1 << 30));
446
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 91 if (st->codecpar->extradata_size) {
447 25 ret = ff_get_extradata(s, st->codecpar, bc,
448 25 st->codecpar->extradata_size);
449
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 25 if (ret < 0)
450 ✗ return ret;
451 }
452
453
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 91 if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
454
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 49 GET_V(st->codecpar->width, tmp > 0);
455
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 49 GET_V(st->codecpar->height, tmp > 0);
456 49 st->sample_aspect_ratio.num = ffio_read_varlen(bc);
457 49 st->sample_aspect_ratio.den = ffio_read_varlen(bc);
458
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 49 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
459 ✗ av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
460 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
461 ✗ ret = AVERROR_INVALIDDATA;
462 ✗ goto fail;
463 }
464 49 ffio_read_varlen(bc); /* csp type */
465
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 42 } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
466
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 42 GET_V(st->codecpar->sample_rate, tmp > 0);
467 42 ffio_read_varlen(bc); // samplerate_den
468
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 42 GET_V(st->codecpar->ch_layout.nb_channels, tmp > 0);
469 }
470
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 91 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
471 ✗ av_log(s, AV_LOG_ERROR,
472 "stream header %d checksum mismatch\n", stream_id);
473 ✗ ret = AVERROR_INVALIDDATA;
474 ✗ goto fail;
475 }
476 91 stc->time_base = &nut->time_base[stc->time_base_id];
477 91 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
478 91 stc->time_base->den);
479 91 return 0;
480 ✗ fail:
481 ✗ if (st && st->codecpar) {
482 ✗ av_freep(&st->codecpar->extradata);
483 ✗ st->codecpar->extradata_size = 0;
484 }
485 ✗ return ret;
486 }
487
488 36 static void set_disposition_bits(AVFormatContext *avf, char *value,
489 int stream_id)
490 {
491 36 int flag = 0, i;
492
493
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 252 for (i = 0; ff_nut_dispositions[i].flag; ++i)
494
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 216 if (!strcmp(ff_nut_dispositions[i].str, value))
495 36 flag = ff_nut_dispositions[i].flag;
496
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 36 if (!flag)
497 ✗ av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
498
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 90 for (i = 0; i < avf->nb_streams; ++i)
499
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 54 if (stream_id == i || stream_id == -1)
500 36 avf->streams[i]->disposition |= flag;
501 36 }
502
503 200 static int decode_info_header(NUTContext *nut)
504 {
505 200 AVFormatContext *s = nut->avf;
506 200 AVIOContext *bc = s->pb;
507 uint64_t tmp, chapter_start, chapter_len;
508 unsigned int stream_id_plus1, count;
509 200 int i, ret = 0;
510 int64_t chapter_id, value, end;
511 char name[256], str_value[1024], type_str[256];
512 const char *type;
513 200 int *event_flags = NULL;
514 200 AVChapter *chapter = NULL;
515 200 AVStream *st = NULL;
516 200 AVDictionary **metadata = NULL;
517 200 int metadata_flag = 0;
518
519 200 end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
520 200 end += avio_tell(bc);
521
522
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 200 GET_V(stream_id_plus1, tmp <= s->nb_streams);
523 200 chapter_id = get_s(bc);
524 200 chapter_start = ffio_read_varlen(bc);
525 200 chapter_len = ffio_read_varlen(bc);
526 200 count = ffio_read_varlen(bc);
527
528
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 200 if (chapter_id && !stream_id_plus1) {
529 40 int64_t start = chapter_start / nut->time_base_count;
530 40 chapter = avpriv_new_chapter(s, chapter_id,
531 40 nut->time_base[chapter_start %
532 40 nut->time_base_count],
533 40 start, start + chapter_len, NULL);
534
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 40 if (!chapter) {
535 ✗ av_log(s, AV_LOG_ERROR, "Could not create chapter.\n");
536 ✗ return AVERROR(ENOMEM);
537 }
538 40 metadata = &chapter->metadata;
539
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 160 } else if (stream_id_plus1) {
540 91 st = s->streams[stream_id_plus1 - 1];
541 91 metadata = &st->metadata;
542 91 event_flags = &st->event_flags;
543 91 metadata_flag = AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
544 } else {
545 69 metadata = &s->metadata;
546 69 event_flags = &s->event_flags;
547 69 metadata_flag = AVFMT_EVENT_FLAG_METADATA_UPDATED;
548 }
549
550
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 645 for (i = 0; i < count; i++) {
551 445 ret = get_str(bc, name, sizeof(name));
552
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 445 if (ret < 0) {
553 ✗ av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
554 ✗ return ret;
555 }
556 445 value = get_s(bc);
557 445 str_value[0] = 0;
558
559
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 445 if (value == -1) {
560 445 type = "UTF-8";
561 445 ret = get_str(bc, str_value, sizeof(str_value));
562 ✗ } else if (value == -2) {
563 ✗ ret = get_str(bc, type_str, sizeof(type_str));
564 ✗ if (ret < 0) {
565 ✗ av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
566 ✗ return ret;
567 }
568 ✗ type = type_str;
569 ✗ ret = get_str(bc, str_value, sizeof(str_value));
570 ✗ } else if (value == -3) {
571 ✗ type = "s";
572 ✗ value = get_s(bc);
573 ✗ } else if (value == -4) {
574 ✗ type = "t";
575 ✗ value = ffio_read_varlen(bc);
576 ✗ } else if (value < -4) {
577 ✗ type = "r";
578 ✗ get_s(bc);
579 } else {
580 ✗ type = "v";
581 }
582
583
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 445 if (ret < 0) {
584 ✗ av_log(s, AV_LOG_ERROR, "get_str failed while decoding info header\n");
585 ✗ return ret;
586 }
587
588
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 445 if (stream_id_plus1 > s->nb_streams) {
589 ✗ av_log(s, AV_LOG_WARNING,
590 "invalid stream id %d for info packet\n",
591 stream_id_plus1);
592 ✗ continue;
593 }
594
595
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 445 if (!strcmp(type, "UTF-8")) {
596
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 445 if (chapter_id == 0 && !strcmp(name, "Disposition")) {
597 36 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
598 36 continue;
599 }
600
601
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 409 if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) {
602 49 sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den);
603
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 49 if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den ||
604
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 46 st->r_frame_rate.num < 0 || st->r_frame_rate.den < 0)
605 3 st->r_frame_rate.num = st->r_frame_rate.den = 0;
606 49 continue;
607 }
608
609
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 720 if (metadata && av_strcasecmp(name, "Uses") &&
610
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 720 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) {
611
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 360 if (event_flags)
612 298 *event_flags |= metadata_flag;
613 360 av_dict_set(metadata, name, str_value, 0);
614 }
615 }
616 }
617
618
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 200 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
619 ✗ av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
620 ✗ return AVERROR_INVALIDDATA;
621 }
622 200 fail:
623 200 return FFMIN(ret, 0);
624 }
625
626 913 static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
627 {
628 913 AVFormatContext *s = nut->avf;
629 913 AVIOContext *bc = s->pb;
630 int64_t end;
631 uint64_t tmp;
632 int ret;
633
634 913 nut->last_syncpoint_pos = avio_tell(bc) - 8;
635
636 913 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
637 913 end += avio_tell(bc);
638
639 913 tmp = ffio_read_varlen(bc);
640 913 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
641
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 913 if (*back_ptr < 0)
642 ✗ return AVERROR_INVALIDDATA;
643
644 913 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
645 913 tmp / nut->time_base_count);
646
647
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 913 if (nut->flags & NUT_BROADCAST) {
648 ✗ tmp = ffio_read_varlen(bc);
649 ✗ av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n",
650 ✗ av_rescale_q(tmp / nut->time_base_count,
651 ✗ nut->time_base[tmp % nut->time_base_count],
652 ✗ AV_TIME_BASE_Q));
653 }
654
655
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 913 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
656 ✗ av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
657 ✗ return AVERROR_INVALIDDATA;
658 }
659
660 1826 *ts = tmp / nut->time_base_count *
661 913 av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE;
662
663
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 913 if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0)
664 ✗ return ret;
665
666 913 return 0;
667 }
668
669 //FIXME calculate exactly, this is just a good approximation.
670 ✗ static int64_t find_duration(NUTContext *nut, int64_t filesize)
671 {
672 ✗ AVFormatContext *s = nut->avf;
673 ✗ int64_t duration = 0;
674
675 ✗ ff_find_last_ts(s, -1, &duration, NULL, nut_read_timestamp);
676
677 ✗ if(duration > 0)
678 ✗ s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
679 ✗ return duration;
680 }
681
682 69 static int find_and_decode_index(NUTContext *nut)
683 {
684 69 AVFormatContext *s = nut->avf;
685 69 AVIOContext *bc = s->pb;
686 uint64_t tmp, end;
687 int i, j, syncpoint_count;
688 69 int64_t filesize = avio_size(bc);
689 69 int64_t *syncpoints = NULL;
690 uint64_t max_pts;
691 69 int8_t *has_keyframe = NULL;
692 69 int ret = AVERROR_INVALIDDATA;
693
694
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 69 if(filesize <= 0)
695 ✗ return -1;
696
697 69 avio_seek(bc, filesize - 12, SEEK_SET);
698 69 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
699
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 69 if (avio_rb64(bc) != INDEX_STARTCODE) {
700 ✗ av_log(s, AV_LOG_WARNING, "no index at the end\n");
701
702 ✗ if(s->duration<=0)
703 ✗ s->duration = find_duration(nut, filesize);
704 ✗ return ret;
705 }
706
707 69 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
708 69 end += avio_tell(bc);
709
710 69 max_pts = ffio_read_varlen(bc);
711 69 s->duration = av_rescale_q(max_pts / nut->time_base_count,
712 69 nut->time_base[max_pts % nut->time_base_count],
713 69 AV_TIME_BASE_Q);
714 69 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
715
716
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 69 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);
717 69 syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t));
718 69 has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t));
719
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 69 if (!syncpoints || !has_keyframe) {
720 ✗ ret = AVERROR(ENOMEM);
721 ✗ goto fail;
722 }
723
2/2
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 966 for (i = 0; i < syncpoint_count; i++) {
724 897 syncpoints[i] = ffio_read_varlen(bc);
725
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 897 if (syncpoints[i] <= 0)
726 ✗ goto fail;
727
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 897 if (i)
728 828 syncpoints[i] += syncpoints[i - 1];
729 }
730
731
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 160 for (i = 0; i < s->nb_streams; i++) {
732 91 int64_t last_pts = -1;
733
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 293 for (j = 0; j < syncpoint_count;) {
734 202 uint64_t x = ffio_read_varlen(bc);
735 202 int type = x & 1;
736 202 int n = j;
737 202 x >>= 1;
738
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 202 if (type) {
739 202 int flag = x & 1;
740 202 x >>= 1;
741
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 202 if (n + x >= syncpoint_count + 1) {
742 ✗ av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1);
743 ✗ goto fail;
744 }
745
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 1144 while (x--)
746 942 has_keyframe[n++] = flag;
747 202 has_keyframe[n++] = !flag;
748 } else {
749 ✗ if (x <= 1) {
750 ✗ av_log(s, AV_LOG_ERROR, "index: x %"PRIu64" is invalid\n", x);
751 ✗ goto fail;
752 }
753 ✗ while (x != 1) {
754 ✗ if (n >= syncpoint_count + 1) {
755 ✗ av_log(s, AV_LOG_ERROR, "index overflow B\n");
756 ✗ goto fail;
757 }
758 ✗ has_keyframe[n++] = x & 1;
759 ✗ x >>= 1;
760 }
761 }
762
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 202 if (has_keyframe[0]) {
763 ✗ av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
764 ✗ goto fail;
765 }
766
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 202 av_assert0(n <= syncpoint_count + 1);
767
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 1323 for (; j < n && j < syncpoint_count; j++) {
768
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 1121 if (has_keyframe[j]) {
769 816 uint64_t B, A = ffio_read_varlen(bc);
770
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 816 if (!A) {
771 ✗ A = ffio_read_varlen(bc);
772 ✗ B = ffio_read_varlen(bc);
773 // eor_pts[j][i] = last_pts + A + B
774 } else
775 816 B = 0;
776 816 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
777 816 last_pts + A, 0, 0, AVINDEX_KEYFRAME);
778 816 last_pts += A + B;
779 }
780 }
781 }
782 }
783
784
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 69 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
785 ✗ av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
786 ✗ goto fail;
787 }
788 69 ret = 0;
789
790 69 fail:
791 69 av_free(syncpoints);
792 69 av_free(has_keyframe);
793 69 return ret;
794 }
795
796 69 static int nut_read_close(AVFormatContext *s)
797 {
798 69 NUTContext *nut = s->priv_data;
799 int i;
800
801 69 av_freep(&nut->time_base);
802 69 av_freep(&nut->stream);
803 69 ff_nut_free_sp(nut);
804
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 483 for (i = 1; i < nut->header_count; i++)
805 414 av_freep(&nut->header[i]);
806
807 69 return 0;
808 }
809
810 69 static int nut_read_header(AVFormatContext *s)
811 {
812 69 NUTContext *nut = s->priv_data;
813 69 AVIOContext *bc = s->pb;
814 int64_t pos;
815 int initialized_stream_count, ret;
816
817 69 nut->avf = s;
818
819 /* main header */
820 69 pos = 0;
821 69 ret = 0;
822 do {
823
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 69 if (ret == AVERROR(ENOMEM))
824 ✗ return ret;
825
826 69 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
827
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 69 if (pos < 0 + 1) {
828 ✗ av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
829 ✗ return AVERROR_INVALIDDATA;
830 }
831
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 69 } while ((ret = decode_main_header(nut)) < 0);
832
833 /* stream headers */
834 69 pos = 0;
835
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 160 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
836 91 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
837
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 91 if (pos < 0 + 1) {
838 ✗ av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
839 ✗ return AVERROR_INVALIDDATA;
840 }
841
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✗ Branch 2 not taken.
 91 if (decode_stream_header(nut) >= 0)
842 91 initialized_stream_count++;
843 }
844
845 /* info headers */
846 69 pos = 0;
847 360 for (;;) {
848 429 uint64_t startcode = find_any_startcode(bc, pos);
849 429 pos = avio_tell(bc);
850
851
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 429 if (startcode == 0) {
852 ✗ av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
853 ✗ return AVERROR_INVALIDDATA;
854
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 429 } else if (startcode == SYNCPOINT_STARTCODE) {
855 69 nut->next_startcode = startcode;
856 69 break;
857
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 360 } else if (startcode != INFO_STARTCODE) {
858 160 continue;
859 }
860
861 200 decode_info_header(nut);
862 }
863
864 69 ffformatcontext(s)->data_offset = pos - 8;
865
866
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 69 if (bc->seekable & AVIO_SEEKABLE_NORMAL) {
867 69 int64_t orig_pos = avio_tell(bc);
868 69 find_and_decode_index(nut);
869 69 avio_seek(bc, orig_pos, SEEK_SET);
870 }
871
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 69 av_assert0(nut->next_startcode == SYNCPOINT_STARTCODE);
872
873 69 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
874
875 69 return 0;
876 }
877
878 2 static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos)
879 {
880 2 int count = ffio_read_varlen(bc);
881 2 int skip_start = 0;
882 2 int skip_end = 0;
883 2 int sample_rate = 0;
884 2 int width = 0;
885 2 int height = 0;
886 int i, ret;
887
888
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 3 for (i=0; i<count; i++) {
889 uint8_t name[256], str_value[256], type_str[256];
890 int value;
891
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 1 if (avio_tell(bc) >= maxpos)
892 ✗ return AVERROR_INVALIDDATA;
893 1 ret = get_str(bc, name, sizeof(name));
894
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 1 if (ret < 0) {
895 ✗ av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
896 ✗ return ret;
897 }
898 1 value = get_s(bc);
899
900
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 1 if (value == -1) {
901 ✗ ret = get_str(bc, str_value, sizeof(str_value));
902 ✗ if (ret < 0) {
903 ✗ av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
904 ✗ return ret;
905 }
906 ✗ av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value);
907
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 1 } else if (value == -2) {
908 1 uint8_t *dst = NULL;
909 int64_t v64, value_len;
910
911 1 ret = get_str(bc, type_str, sizeof(type_str));
912
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 1 if (ret < 0) {
913 ✗ av_log(s, AV_LOG_ERROR, "get_str failed while reading sm data\n");
914 ✗ return ret;
915 }
916 1 value_len = ffio_read_varlen(bc);
917
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 1 if (value_len < 0 || value_len >= maxpos - avio_tell(bc))
918 ✗ return AVERROR_INVALIDDATA;
919
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 1 if (!strcmp(name, "Palette")) {
920 ✗ dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len);
921
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 1 } else if (!strcmp(name, "Extradata")) {
922 1 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, value_len);
923 ✗ } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) {
924 ✗ dst = av_packet_new_side_data(pkt, AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, value_len + 8);
925 ✗ if(!dst)
926 ✗ return AVERROR(ENOMEM);
927 ✗ AV_WB64(dst, v64);
928 ✗ dst += 8;
929 ✗ } else if (!strcmp(name, "ChannelLayout") && value_len == 8) {
930 // Ignored
931 ✗ continue;
932 } else {
933 ✗ av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str);
934 ✗ avio_skip(bc, value_len);
935 ✗ continue;
936 }
937
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 1 if(!dst)
938 ✗ return AVERROR(ENOMEM);
939 1 avio_read(bc, dst, value_len);
940 if (HAVE_BIGENDIAN && !strcmp(name, "Palette"))
941 for (int j = 0; j + 4 <= value_len; j += 4)
942 AV_WN32(dst + j, AV_RL32(dst + j));
943 ✗ } else if (value == -3) {
944 ✗ value = get_s(bc);
945 ✗ } else if (value == -4) {
946 ✗ value = ffio_read_varlen(bc);
947 ✗ } else if (value < -4) {
948 ✗ get_s(bc);
949 } else {
950 ✗ if (!strcmp(name, "SkipStart")) {
951 ✗ skip_start = value;
952 ✗ } else if (!strcmp(name, "SkipEnd")) {
953 ✗ skip_end = value;
954 ✗ } else if (!strcmp(name, "Channels")) {
955 // Ignored
956 ✗ } else if (!strcmp(name, "SampleRate")) {
957 ✗ sample_rate = value;
958 ✗ } else if (!strcmp(name, "Width")) {
959 ✗ width = value;
960 ✗ } else if (!strcmp(name, "Height")) {
961 ✗ height = value;
962 } else {
963 ✗ av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name);
964 }
965 }
966 }
967
968
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 2 if (sample_rate || width || height) {
969 ✗ uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PARAM_CHANGE, 16);
970 ✗ if (!dst)
971 ✗ return AVERROR(ENOMEM);
972 ✗ bytestream_put_le32(&dst,
973 ✗ AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE*(!!sample_rate) +
974 ✗ AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS*(!!(width|height))
975 );
976 ✗ if (sample_rate)
977 ✗ bytestream_put_le32(&dst, sample_rate);
978 ✗ if (width || height){
979 ✗ bytestream_put_le32(&dst, width);
980 ✗ bytestream_put_le32(&dst, height);
981 }
982 }
983
984
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 2 if (skip_start || skip_end) {
985 ✗ uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10);
986 ✗ if (!dst)
987 ✗ return AVERROR(ENOMEM);
988 ✗ AV_WL32(dst, skip_start);
989 ✗ AV_WL32(dst+4, skip_end);
990 }
991
992
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 2 if (avio_tell(bc) >= maxpos)
993 ✗ return AVERROR_INVALIDDATA;
994
995 2 return 0;
996 }
997
998 1728 static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
999 uint8_t *header_idx, int frame_code)
1000 {
1001 1728 AVFormatContext *s = nut->avf;
1002 1728 AVIOContext *bc = s->pb;
1003 StreamContext *stc;
1004 int size, flags, size_mul, pts_delta, i, reserved_count, ret;
1005 uint64_t tmp;
1006
1007
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 1728 if (!(nut->flags & NUT_PIPE) &&
1008
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 1711 avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
1009 ✗ av_log(s, AV_LOG_ERROR,
1010 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
1011 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
1012 ✗ return AVERROR_INVALIDDATA;
1013 }
1014
1015 1728 flags = nut->frame_code[frame_code].flags;
1016 1728 size_mul = nut->frame_code[frame_code].size_mul;
1017 1728 size = nut->frame_code[frame_code].size_lsb;
1018 1728 *stream_id = nut->frame_code[frame_code].stream_id;
1019 1728 pts_delta = nut->frame_code[frame_code].pts_delta;
1020 1728 reserved_count = nut->frame_code[frame_code].reserved_count;
1021 1728 *header_idx = nut->frame_code[frame_code].header_idx;
1022
1023
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 1728 if (flags & FLAG_INVALID)
1024 ✗ return AVERROR_INVALIDDATA;
1025
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 1728 if (flags & FLAG_CODED)
1026 98 flags ^= ffio_read_varlen(bc);
1027
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 1728 if (flags & FLAG_STREAM_ID) {
1028
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 32 GET_V(*stream_id, tmp < s->nb_streams);
1029 }
1030 1728 stc = &nut->stream[*stream_id];
1031
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 1728 if (flags & FLAG_CODED_PTS) {
1032 1197 int64_t coded_pts = ffio_read_varlen(bc);
1033 // FIXME check last_pts validity?
1034
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✗ Branch 1 not taken.
 1197 if (coded_pts < (1LL << stc->msb_pts_shift)) {
1035 1197 *pts = ff_lsb2full(stc, coded_pts);
1036 } else
1037 ✗ *pts = coded_pts - (1LL << stc->msb_pts_shift);
1038 } else
1039 531 *pts = stc->last_pts + pts_delta;
1040
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 1728 if (flags & FLAG_SIZE_MSB)
1041 1695 size += size_mul * ffio_read_varlen(bc);
1042
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 1728 if (flags & FLAG_MATCH_TIME)
1043 ✗ get_s(bc);
1044
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 1728 if (flags & FLAG_HEADER_IDX)
1045 ✗ *header_idx = ffio_read_varlen(bc);
1046
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 1728 if (flags & FLAG_RESERVED)
1047 ✗ reserved_count = ffio_read_varlen(bc);
1048
1/2
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 1728 for (i = 0; i < reserved_count; i++) {
1049 ✗ if (bc->eof_reached) {
1050 ✗ av_log(s, AV_LOG_ERROR, "reached EOF while decoding frame header\n");
1051 ✗ return AVERROR_INVALIDDATA;
1052 }
1053 ✗ ffio_read_varlen(bc);
1054 }
1055
1056
1/2
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 1728 if (*header_idx >= (unsigned)nut->header_count) {
1057 ✗ av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
1058 ✗ return AVERROR_INVALIDDATA;
1059 }
1060
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 1728 if (size > 4096)
1061 945 *header_idx = 0;
1062 1728 size -= nut->header_len[*header_idx];
1063
1064
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 1728 if (flags & FLAG_CHECKSUM) {
1065 83 avio_rb32(bc); // FIXME check this
1066
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✓ Branch 1 taken 16 times.
 1645 } else if (!(nut->flags & NUT_PIPE) &&
1067
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 1629 size > 2 * nut->max_distance ||
1068
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 1645 FFABS(stc->last_pts - *pts) > stc->max_pts_distance) {
1069 ✗ av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
1070 ✗ return AVERROR_INVALIDDATA;
1071 }
1072
1073 1728 stc->last_pts = *pts;
1074 1728 stc->last_flags = flags;
1075
1076 1728 return size;
1077 ✗ fail:
1078 ✗ return ret;
1079 }
1080
1081 1728 static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
1082 {
1083 1728 AVFormatContext *s = nut->avf;
1084 1728 AVIOContext *bc = s->pb;
1085 int size, stream_id, discard, ret;
1086 int64_t pts, last_IP_pts;
1087 StreamContext *stc;
1088 uint8_t header_idx;
1089
1090 1728 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
1091
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 1728 if (size < 0)
1092 ✗ return size;
1093
1094 1728 stc = &nut->stream[stream_id];
1095
1096
2/2
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 1728 if (stc->last_flags & FLAG_KEY)
1097 1371 stc->skip_until_key_frame = 0;
1098
1099 1728 discard = s->streams[stream_id]->discard;
1100 1728 last_IP_pts = ffstream(s->streams[stream_id])->last_IP_pts;
1101
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 1728 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
1102
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 43 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
1103
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 1728 last_IP_pts > pts) ||
1104 1685 discard >= AVDISCARD_ALL ||
1105
2/2
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 1685 stc->skip_until_key_frame) {
1106 50 avio_skip(bc, size);
1107 50 return 1;
1108 }
1109
1110 1678 ret = av_new_packet(pkt, size + nut->header_len[header_idx]);
1111
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 1678 if (ret < 0)
1112 ✗ return ret;
1113
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✓ Branch 1 taken 1630 times.
 1678 if (nut->header[header_idx])
1114 48 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
1115 1678 pkt->pos = avio_tell(bc); // FIXME
1116
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 1678 if (stc->last_flags & FLAG_SM_DATA) {
1117 int sm_size;
1118
1/2
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✓ Branch 2 taken 1 times.
 1 if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0) {
1119 ✗ ret = AVERROR_INVALIDDATA;
1120 ✗ goto fail;
1121 }
1122
1/2
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✓ Branch 2 taken 1 times.
 1 if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0) {
1123 ✗ ret = AVERROR_INVALIDDATA;
1124 ✗ goto fail;
1125 }
1126 1 sm_size = avio_tell(bc) - pkt->pos;
1127 1 size -= sm_size;
1128 }
1129
1130 1678 ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size);
1131
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✓ Branch 1 taken 1678 times.
 1678 if (ret != size) {
1132 ✗ if (ret < 0)
1133 ✗ goto fail;
1134 }
1135 1678 av_shrink_packet(pkt, nut->header_len[header_idx] + ret);
1136
1137 1678 pkt->stream_index = stream_id;
1138
2/2
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✓ Branch 1 taken 350 times.
 1678 if (stc->last_flags & FLAG_KEY)
1139 1328 pkt->flags |= AV_PKT_FLAG_KEY;
1140 1678 pkt->pts = pts;
1141
1142 1678 return 0;
1143 ✗ fail:
1144 ✗ av_packet_unref(pkt);
1145 ✗ return ret;
1146 }
1147
1148 1749 static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1149 {
1150 1749 NUTContext *nut = s->priv_data;
1151 1749 AVIOContext *bc = s->pb;
1152 1749 int i, frame_code = 0, ret, skip;
1153 int64_t ts, back_ptr;
1154
1155 110 for (;;) {
1156 1859 int64_t pos = avio_tell(bc);
1157 1859 uint64_t tmp = nut->next_startcode;
1158 1859 nut->next_startcode = 0;
1159
1160
2/2
✓ Branch 0 taken 69 times.
✓ Branch 1 taken 1790 times.
 1859 if (tmp) {
1161 69 pos -= 8;
1162 } else {
1163 1790 frame_code = avio_r8(bc);
1164
2/2
✓ Branch 1 taken 71 times.
✓ Branch 2 taken 1719 times.
 1790 if (avio_feof(bc))
1165 71 return AVERROR_EOF;
1166
2/2
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✓ Branch 1 taken 815 times.
 1719 if (frame_code == 'N') {
1167 904 tmp = frame_code;
1168
2/2
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✓ Branch 1 taken 904 times.
 7232 for (i = 1; i < 8; i++)
1169 6328 tmp = (tmp << 8) + avio_r8(bc);
1170 }
1171 }
1172
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 1788 switch (tmp) {
1173 60 case MAIN_STARTCODE:
1174 case STREAM_STARTCODE:
1175 case INDEX_STARTCODE:
1176 60 skip = get_packetheader(nut, bc, 0, tmp);
1177 60 avio_skip(bc, skip);
1178 60 break;
1179 ✗ case INFO_STARTCODE:
1180 ✗ if (decode_info_header(nut) < 0)
1181 ✗ goto resync;
1182 ✗ break;
1183 913 case SYNCPOINT_STARTCODE:
1184
1/2
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✓ Branch 2 taken 913 times.
 913 if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
1185 ✗ goto resync;
1186 913 frame_code = avio_r8(bc);
1187 av_fallthrough;
1188 1728 case 0:
1189 1728 ret = decode_frame(nut, pkt, frame_code);
1190
2/2
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✓ Branch 1 taken 50 times.
 1728 if (ret == 0)
1191 1678 return 0;
1192
1/2
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✗ Branch 1 not taken.
 50 else if (ret == 1) // OK but discard packet
1193 50 break;
1194 av_fallthrough;
1195 default:
1196 ✗ resync:
1197 ✗ av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
1198 ✗ tmp = find_any_startcode(bc, FFMAX(nut->last_syncpoint_pos, nut->last_resync_pos) + 1);
1199 ✗ nut->last_resync_pos = avio_tell(bc);
1200 ✗ if (tmp == 0)
1201 ✗ return AVERROR_INVALIDDATA;
1202 ✗ av_log(s, AV_LOG_DEBUG, "sync\n");
1203 ✗ nut->next_startcode = tmp;
1204 }
1205 }
1206 }
1207
1208 ✗ static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
1209 int64_t *pos_arg, int64_t pos_limit)
1210 {
1211 ✗ NUTContext *nut = s->priv_data;
1212 ✗ AVIOContext *bc = s->pb;
1213 int64_t pos, pts, back_ptr;
1214 ✗ av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
1215 stream_index, *pos_arg, pos_limit);
1216
1217 ✗ pos = *pos_arg;
1218 do {
1219 ✗ pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
1220 ✗ if (pos < 1) {
1221 ✗ av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
1222 ✗ return AV_NOPTS_VALUE;
1223 }
1224 ✗ } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
1225 ✗ *pos_arg = pos - 1;
1226 ✗ av_assert0(nut->last_syncpoint_pos == *pos_arg);
1227
1228 ✗ av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
1229 ✗ if (stream_index == -2)
1230 ✗ return back_ptr;
1231 ✗ av_assert0(stream_index == -1);
1232 ✗ return pts;
1233 }
1234
1235 26 static int read_seek(AVFormatContext *s, int stream_index,
1236 int64_t pts, int flags)
1237 {
1238 26 NUTContext *nut = s->priv_data;
1239 26 AVStream *st = s->streams[stream_index];
1240 26 FFStream *const sti = ffstream(st);
1241 26 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
1242 26 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
1243 26 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
1244 int64_t pos, pos2, ts;
1245 int i;
1246
1247
1/2
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 26 if (nut->flags & NUT_PIPE) {
1248 ✗ return AVERROR(ENOSYS);
1249 }
1250
1251
1/2
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✗ Branch 1 not taken.
 26 if (sti->index_entries) {
1252 26 int index = av_index_search_timestamp(st, pts, flags);
1253
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 26 if (index < 0)
1254 11 index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD);
1255
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✓ Branch 1 taken 26 times.
 26 if (index < 0)
1256 ✗ return -1;
1257
1258 26 pos2 = sti->index_entries[index].pos;
1259 26 ts = sti->index_entries[index].timestamp;
1260 } else {
1261 ✗ av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pts_cmp,
1262 (void **) next_node);
1263 ✗ av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
1264 ✗ next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
1265 ✗ next_node[1]->ts);
1266 ✗ pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
1267 ✗ next_node[1]->pos, next_node[1]->pos,
1268 ✗ next_node[0]->ts, next_node[1]->ts,
1269 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
1270 ✗ if (pos < 0)
1271 ✗ return pos;
1272
1273 ✗ if (!(flags & AVSEEK_FLAG_BACKWARD)) {
1274 ✗ dummy.pos = pos + 16;
1275 ✗ next_node[1] = &nopts_sp;
1276 ✗ av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp,
1277 (void **) next_node);
1278 ✗ pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
1279 ✗ next_node[1]->pos, next_node[1]->pos,
1280 ✗ next_node[0]->back_ptr, next_node[1]->back_ptr,
1281 flags, &ts, nut_read_timestamp);
1282 ✗ if (pos2 >= 0)
1283 ✗ pos = pos2;
1284 // FIXME dir but I think it does not matter
1285 }
1286 ✗ dummy.pos = pos;
1287 ✗ sp = av_tree_find(nut->syncpoints, &dummy, ff_nut_sp_pos_cmp,
1288 NULL);
1289
1290 ✗ av_assert0(sp);
1291 ✗ pos2 = sp->back_ptr - 15;
1292 }
1293 26 av_log(s, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
1294 26 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
1295 26 avio_seek(s->pb, pos, SEEK_SET);
1296 26 nut->last_syncpoint_pos = pos;
1297 26 av_log(s, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
1298
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 26 if (pos2 > pos || pos2 + 15 < pos)
1299 ✗ av_log(s, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
1300
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 78 for (i = 0; i < s->nb_streams; i++)
1301 52 nut->stream[i].skip_until_key_frame = 1;
1302
1303 26 nut->last_resync_pos = 0;
1304
1305 26 return 0;
1306 }
1307
1308 const FFInputFormat ff_nut_demuxer = {
1309 .p.name = "nut",
1310 .p.long_name = NULL_IF_CONFIG_SMALL("NUT"),
1311 .p.flags = AVFMT_SEEK_TO_PTS,
1312 .p.extensions = "nut",
1313 .p.codec_tag = ff_nut_codec_tags,
1314 .priv_data_size = sizeof(NUTContext),
1315 .flags_internal = FF_INFMT_FLAG_INIT_CLEANUP,
1316 .read_probe = nut_probe,
1317 .read_header = nut_read_header,
1318 .read_packet = nut_read_packet,
1319 .read_close = nut_read_close,
1320 .read_seek = read_seek,
1321 };
1322