repositories / deb_ffmpeg.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavformat / nutdec.c
CommitLineData
2ba45a60
DM		 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/avstring.h"
24#include "libavutil/avassert.h"
25#include "libavutil/bswap.h"
26#include "libavutil/dict.h"
27#include "libavutil/intreadwrite.h"
28#include "libavutil/mathematics.h"
29#include "libavutil/tree.h"
30#include "libavcodec/bytestream.h"
31#include "avio_internal.h"
32#include "isom.h"
33#include "nut.h"
34#include "riff.h"
35
36#define NUT_MAX_STREAMS 256 /* arbitrary sanity check value */
37
38static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
39 int64_t *pos_arg, int64_t pos_limit);
40
41static int get_str(AVIOContext *bc, char *string, unsigned int maxlen)
42{
43 unsigned int len = ffio_read_varlen(bc);
44
45 if (len && maxlen)
46 avio_read(bc, string, FFMIN(len, maxlen));
47 while (len > maxlen) {
48 avio_r8(bc);
49 len--;
50 }
51
52 if (maxlen)
53 string[FFMIN(len, maxlen - 1)] = 0;
54
55 if (maxlen == len)
56 return -1;
57 else
58 return 0;
59}
60
61static int64_t get_s(AVIOContext *bc)
62{
63 int64_t v = ffio_read_varlen(bc) + 1;
64
65 if (v & 1)
66 return -(v >> 1);
67 else
68 return (v >> 1);
69}
70
71static uint64_t get_fourcc(AVIOContext *bc)
72{
73 unsigned int len = ffio_read_varlen(bc);
74
75 if (len == 2)
76 return avio_rl16(bc);
77 else if (len == 4)
78 return avio_rl32(bc);
79 else {
80 av_log(NULL, AV_LOG_ERROR, "Unsupported fourcc length %d\n", len);
81 return -1;
82 }
83}
84
85#ifdef TRACE
86static inline uint64_t get_v_trace(AVIOContext *bc, const char *file,
87 const char *func, int line)
88{
89 uint64_t v = ffio_read_varlen(bc);
90
91 av_log(NULL, AV_LOG_DEBUG, "get_v %5"PRId64" / %"PRIX64" in %s %s:%d\n",
92 v, v, file, func, line);
93 return v;
94}
95
96static inline int64_t get_s_trace(AVIOContext *bc, const char *file,
97 const char *func, int line)
98{
99 int64_t v = get_s(bc);
100
101 av_log(NULL, AV_LOG_DEBUG, "get_s %5"PRId64" / %"PRIX64" in %s %s:%d\n",
102 v, v, file, func, line);
103 return v;
104}
105
106static inline uint64_t get_4cc_trace(AVIOContext *bc, char *file,
107 char *func, int line)
108{
109 uint64_t v = get_fourcc(bc);
110
111 av_log(NULL, AV_LOG_DEBUG, "get_fourcc %5"PRId64" / %"PRIX64" in %s %s:%d\n",
112 v, v, file, func, line);
113 return v;
114}
115#define ffio_read_varlen(bc) get_v_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
116#define get_s(bc) get_s_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
117#define get_fourcc(bc) get_4cc_trace(bc, __FILE__, __PRETTY_FUNCTION__, __LINE__)
118#endif
119
120static int get_packetheader(NUTContext *nut, AVIOContext *bc,
121 int calculate_checksum, uint64_t startcode)
122{
123 int64_t size;
124// start = avio_tell(bc) - 8;
125
126 startcode = av_be2ne64(startcode);
127 startcode = ff_crc04C11DB7_update(0, (uint8_t*) &startcode, 8);
128
129 ffio_init_checksum(bc, ff_crc04C11DB7_update, startcode);
130 size = ffio_read_varlen(bc);
131 if (size > 4096)
132 avio_rb32(bc);
133 if (ffio_get_checksum(bc) && size > 4096)
134 return -1;
135
136 ffio_init_checksum(bc, calculate_checksum ? ff_crc04C11DB7_update : NULL, 0);
137
138 return size;
139}
140
141static uint64_t find_any_startcode(AVIOContext *bc, int64_t pos)
142{
143 uint64_t state = 0;
144
145 if (pos >= 0)
146 /* Note, this may fail if the stream is not seekable, but that should
147 * not matter, as in this case we simply start where we currently are */
148 avio_seek(bc, pos, SEEK_SET);
149 while (!avio_feof(bc)) {
150 state = (state << 8) | avio_r8(bc);
151 if ((state >> 56) != 'N')
152 continue;
153 switch (state) {
154 case MAIN_STARTCODE:
155 case STREAM_STARTCODE:
156 case SYNCPOINT_STARTCODE:
157 case INFO_STARTCODE:
158 case INDEX_STARTCODE:
159 return state;
160 }
161 }
162
163 return 0;
164}
165
166/**
167 * Find the given startcode.
168 * @param code the startcode
169 * @param pos the start position of the search, or -1 if the current position
170 * @return the position of the startcode or -1 if not found
171 */
172static int64_t find_startcode(AVIOContext *bc, uint64_t code, int64_t pos)
173{
174 for (;;) {
175 uint64_t startcode = find_any_startcode(bc, pos);
176 if (startcode == code)
177 return avio_tell(bc) - 8;
178 else if (startcode == 0)
179 return -1;
180 pos = -1;
181 }
182}
183
184static int nut_probe(AVProbeData *p)
185{
186 int i;
187
188 for (i = 0; i < p->buf_size-8; i++) {
189 if (AV_RB32(p->buf+i) != MAIN_STARTCODE>>32)
190 continue;
191 if (AV_RB32(p->buf+i+4) == (MAIN_STARTCODE & 0xFFFFFFFF))
192 return AVPROBE_SCORE_MAX;
193 }
194 return 0;
195}
196
197#define GET_V(dst, check) \
198 do { \
199 tmp = ffio_read_varlen(bc); \
200 if (!(check)) { \
201 av_log(s, AV_LOG_ERROR, "Error " #dst " is (%"PRId64")\n", tmp); \
202 return AVERROR_INVALIDDATA; \
203 } \
204 dst = tmp; \
205 } while (0)
206
207static int skip_reserved(AVIOContext *bc, int64_t pos)
208{
209 pos -= avio_tell(bc);
210 if (pos < 0) {
211 avio_seek(bc, pos, SEEK_CUR);
212 return AVERROR_INVALIDDATA;
213 } else {
214 while (pos--)
215 avio_r8(bc);
216 return 0;
217 }
218}
219
220static int decode_main_header(NUTContext *nut)
221{
222 AVFormatContext *s = nut->avf;
223 AVIOContext *bc = s->pb;
224 uint64_t tmp, end;
225 unsigned int stream_count;
226 int i, j, count;
227 int tmp_stream, tmp_mul, tmp_pts, tmp_size, tmp_res, tmp_head_idx;
228
229 end = get_packetheader(nut, bc, 1, MAIN_STARTCODE);
230 end += avio_tell(bc);
231
232 nut->version = ffio_read_varlen(bc);
233 if (nut->version < NUT_MIN_VERSION &&
234 nut->version > NUT_MAX_VERSION) {
235 av_log(s, AV_LOG_ERROR, "Version %d not supported.\n",
236 nut->version);
237 return AVERROR(ENOSYS);
238 }
239 if (nut->version > 3)
240 nut->minor_version = ffio_read_varlen(bc);
241
242 GET_V(stream_count, tmp > 0 && tmp <= NUT_MAX_STREAMS);
243
244 nut->max_distance = ffio_read_varlen(bc);
245 if (nut->max_distance > 65536) {
246 av_log(s, AV_LOG_DEBUG, "max_distance %d\n", nut->max_distance);
247 nut->max_distance = 65536;
248 }
249
250 GET_V(nut->time_base_count, tmp > 0 && tmp < INT_MAX / sizeof(AVRational));
251 nut->time_base = av_malloc(nut->time_base_count * sizeof(AVRational));
252 if (!nut->time_base)
253 return AVERROR(ENOMEM);
254
255 for (i = 0; i < nut->time_base_count; i++) {
256 GET_V(nut->time_base[i].num, tmp > 0 && tmp < (1ULL << 31));
257 GET_V(nut->time_base[i].den, tmp > 0 && tmp < (1ULL << 31));
258 if (av_gcd(nut->time_base[i].num, nut->time_base[i].den) != 1) {
259 av_log(s, AV_LOG_ERROR, "time base invalid\n");
260 return AVERROR_INVALIDDATA;
261 }
262 }
263 tmp_pts = 0;
264 tmp_mul = 1;
265 tmp_stream = 0;
266 tmp_head_idx = 0;
267 for (i = 0; i < 256;) {
268 int tmp_flags = ffio_read_varlen(bc);
269 int tmp_fields = ffio_read_varlen(bc);
270
271 if (tmp_fields > 0)
272 tmp_pts = get_s(bc);
273 if (tmp_fields > 1)
274 tmp_mul = ffio_read_varlen(bc);
275 if (tmp_fields > 2)
276 tmp_stream = ffio_read_varlen(bc);
277 if (tmp_fields > 3)
278 tmp_size = ffio_read_varlen(bc);
279 else
280 tmp_size = 0;
281 if (tmp_fields > 4)
282 tmp_res = ffio_read_varlen(bc);
283 else
284 tmp_res = 0;
285 if (tmp_fields > 5)
286 count = ffio_read_varlen(bc);
287 else
288 count = tmp_mul - tmp_size;
289 if (tmp_fields > 6)
290 get_s(bc);
291 if (tmp_fields > 7)
292 tmp_head_idx = ffio_read_varlen(bc);
293
294 while (tmp_fields-- > 8)
295 ffio_read_varlen(bc);
296
297 if (count == 0 || i + count > 256) {
298 av_log(s, AV_LOG_ERROR, "illegal count %d at %d\n", count, i);
299 return AVERROR_INVALIDDATA;
300 }
301 if (tmp_stream >= stream_count) {
302 av_log(s, AV_LOG_ERROR, "illegal stream number\n");
303 return AVERROR_INVALIDDATA;
304 }
305
306 for (j = 0; j < count; j++, i++) {
307 if (i == 'N') {
308 nut->frame_code[i].flags = FLAG_INVALID;
309 j--;
310 continue;
311 }
312 nut->frame_code[i].flags = tmp_flags;
313 nut->frame_code[i].pts_delta = tmp_pts;
314 nut->frame_code[i].stream_id = tmp_stream;
315 nut->frame_code[i].size_mul = tmp_mul;
316 nut->frame_code[i].size_lsb = tmp_size + j;
317 nut->frame_code[i].reserved_count = tmp_res;
318 nut->frame_code[i].header_idx = tmp_head_idx;
319 }
320 }
321 av_assert0(nut->frame_code['N'].flags == FLAG_INVALID);
322
323 if (end > avio_tell(bc) + 4) {
324 int rem = 1024;
325 GET_V(nut->header_count, tmp < 128U);
326 nut->header_count++;
327 for (i = 1; i < nut->header_count; i++) {
328 uint8_t *hdr;
329 GET_V(nut->header_len[i], tmp > 0 && tmp < 256);
330 rem -= nut->header_len[i];
331 if (rem < 0) {
332 av_log(s, AV_LOG_ERROR, "invalid elision header\n");
333 return AVERROR_INVALIDDATA;
334 }
335 hdr = av_malloc(nut->header_len[i]);
336 if (!hdr)
337 return AVERROR(ENOMEM);
338 avio_read(bc, hdr, nut->header_len[i]);
339 nut->header[i] = hdr;
340 }
341 av_assert0(nut->header_len[0] == 0);
342 }
343
344 // flags had been effectively introduced in version 4
345 if (nut->version > 3 && end > avio_tell(bc) + 4) {
346 nut->flags = ffio_read_varlen(bc);
347 }
348
349 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
350 av_log(s, AV_LOG_ERROR, "main header checksum mismatch\n");
351 return AVERROR_INVALIDDATA;
352 }
353
354 nut->stream = av_calloc(stream_count, sizeof(StreamContext));
355 if (!nut->stream)
356 return AVERROR(ENOMEM);
357 for (i = 0; i < stream_count; i++)
358 avformat_new_stream(s, NULL);
359
360 return 0;
361}
362
363static int decode_stream_header(NUTContext *nut)
364{
365 AVFormatContext *s = nut->avf;
366 AVIOContext *bc = s->pb;
367 StreamContext *stc;
368 int class, stream_id;
369 uint64_t tmp, end;
370 AVStream *st;
371
372 end = get_packetheader(nut, bc, 1, STREAM_STARTCODE);
373 end += avio_tell(bc);
374
375 GET_V(stream_id, tmp < s->nb_streams && !nut->stream[tmp].time_base);
376 stc = &nut->stream[stream_id];
377 st = s->streams[stream_id];
378 if (!st)
379 return AVERROR(ENOMEM);
380
381 class = ffio_read_varlen(bc);
382 tmp = get_fourcc(bc);
383 st->codec->codec_tag = tmp;
384 switch (class) {
385 case 0:
386 st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
387 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
388 ff_nut_video_tags,
389 ff_codec_bmp_tags,
390 ff_codec_movvideo_tags,
391 0
392 },
393 tmp);
394 break;
395 case 1:
396 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
397 st->codec->codec_id = av_codec_get_id((const AVCodecTag * const []) {
398 ff_nut_audio_tags,
399 ff_codec_wav_tags,
400 ff_nut_audio_extra_tags,
401 0
402 },
403 tmp);
404 break;
405 case 2:
406 st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
407 st->codec->codec_id = ff_codec_get_id(ff_nut_subtitle_tags, tmp);
408 break;
409 case 3:
410 st->codec->codec_type = AVMEDIA_TYPE_DATA;
411 st->codec->codec_id = ff_codec_get_id(ff_nut_data_tags, tmp);
412 break;
413 default:
414 av_log(s, AV_LOG_ERROR, "unknown stream class (%d)\n", class);
415 return AVERROR(ENOSYS);
416 }
417 if (class < 3 && st->codec->codec_id == AV_CODEC_ID_NONE)
418 av_log(s, AV_LOG_ERROR,
419 "Unknown codec tag '0x%04x' for stream number %d\n",
420 (unsigned int) tmp, stream_id);
421
422 GET_V(stc->time_base_id, tmp < nut->time_base_count);
423 GET_V(stc->msb_pts_shift, tmp < 16);
424 stc->max_pts_distance = ffio_read_varlen(bc);
425 GET_V(stc->decode_delay, tmp < 1000); // sanity limit, raise this if Moore's law is true
426 st->codec->has_b_frames = stc->decode_delay;
427 ffio_read_varlen(bc); // stream flags
428
429 GET_V(st->codec->extradata_size, tmp < (1 << 30));
430 if (st->codec->extradata_size) {
431 if (ff_get_extradata(st->codec, bc, st->codec->extradata_size) < 0)
432 return AVERROR(ENOMEM);
433 }
434
435 if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
436 GET_V(st->codec->width, tmp > 0);
437 GET_V(st->codec->height, tmp > 0);
438 st->sample_aspect_ratio.num = ffio_read_varlen(bc);
439 st->sample_aspect_ratio.den = ffio_read_varlen(bc);
440 if ((!st->sample_aspect_ratio.num) != (!st->sample_aspect_ratio.den)) {
441 av_log(s, AV_LOG_ERROR, "invalid aspect ratio %d/%d\n",
442 st->sample_aspect_ratio.num, st->sample_aspect_ratio.den);
443 return AVERROR_INVALIDDATA;
444 }
445 ffio_read_varlen(bc); /* csp type */
446 } else if (st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
447 GET_V(st->codec->sample_rate, tmp > 0);
448 ffio_read_varlen(bc); // samplerate_den
449 GET_V(st->codec->channels, tmp > 0);
450 }
451 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
452 av_log(s, AV_LOG_ERROR,
453 "stream header %d checksum mismatch\n", stream_id);
454 return AVERROR_INVALIDDATA;
455 }
456 stc->time_base = &nut->time_base[stc->time_base_id];
457 avpriv_set_pts_info(s->streams[stream_id], 63, stc->time_base->num,
458 stc->time_base->den);
459 return 0;
460}
461
462static void set_disposition_bits(AVFormatContext *avf, char *value,
463 int stream_id)
464{
465 int flag = 0, i;
466
467 for (i = 0; ff_nut_dispositions[i].flag; ++i)
468 if (!strcmp(ff_nut_dispositions[i].str, value))
469 flag = ff_nut_dispositions[i].flag;
470 if (!flag)
471 av_log(avf, AV_LOG_INFO, "unknown disposition type '%s'\n", value);
472 for (i = 0; i < avf->nb_streams; ++i)
473 if (stream_id == i || stream_id == -1)
474 avf->streams[i]->disposition |= flag;
475}
476
477static int decode_info_header(NUTContext *nut)
478{
479 AVFormatContext *s = nut->avf;
480 AVIOContext *bc = s->pb;
481 uint64_t tmp, chapter_start, chapter_len;
482 unsigned int stream_id_plus1, count;
483 int chapter_id, i;
484 int64_t value, end;
485 char name[256], str_value[1024], type_str[256];
486 const char *type;
f6fa7814 487 int *event_flags = NULL;
2ba45a60
DM		 488 AVChapter *chapter = NULL;
489 AVStream *st = NULL;
490 AVDictionary **metadata = NULL;
491 int metadata_flag = 0;
492
493 end = get_packetheader(nut, bc, 1, INFO_STARTCODE);
494 end += avio_tell(bc);
495
496 GET_V(stream_id_plus1, tmp <= s->nb_streams);
497 chapter_id = get_s(bc);
498 chapter_start = ffio_read_varlen(bc);
499 chapter_len = ffio_read_varlen(bc);
500 count = ffio_read_varlen(bc);
501
502 if (chapter_id && !stream_id_plus1) {
503 int64_t start = chapter_start / nut->time_base_count;
504 chapter = avpriv_new_chapter(s, chapter_id,
505 nut->time_base[chapter_start %
506 nut->time_base_count],
507 start, start + chapter_len, NULL);
508 metadata = &chapter->metadata;
509 } else if (stream_id_plus1) {
510 st = s->streams[stream_id_plus1 - 1];
511 metadata = &st->metadata;
512 event_flags = &st->event_flags;
513 metadata_flag = AVSTREAM_EVENT_FLAG_METADATA_UPDATED;
514 } else {
515 metadata = &s->metadata;
516 event_flags = &s->event_flags;
517 metadata_flag = AVFMT_EVENT_FLAG_METADATA_UPDATED;
518 }
519
520 for (i = 0; i < count; i++) {
521 get_str(bc, name, sizeof(name));
522 value = get_s(bc);
523 if (value == -1) {
524 type = "UTF-8";
525 get_str(bc, str_value, sizeof(str_value));
526 } else if (value == -2) {
527 get_str(bc, type_str, sizeof(type_str));
528 type = type_str;
529 get_str(bc, str_value, sizeof(str_value));
530 } else if (value == -3) {
531 type = "s";
532 value = get_s(bc);
533 } else if (value == -4) {
534 type = "t";
535 value = ffio_read_varlen(bc);
536 } else if (value < -4) {
537 type = "r";
538 get_s(bc);
539 } else {
540 type = "v";
541 }
542
543 if (stream_id_plus1 > s->nb_streams) {
544 av_log(s, AV_LOG_ERROR, "invalid stream id for info packet\n");
545 continue;
546 }
547
548 if (!strcmp(type, "UTF-8")) {
549 if (chapter_id == 0 && !strcmp(name, "Disposition")) {
550 set_disposition_bits(s, str_value, stream_id_plus1 - 1);
551 continue;
552 }
553
554 if (stream_id_plus1 && !strcmp(name, "r_frame_rate")) {
555 sscanf(str_value, "%d/%d", &st->r_frame_rate.num, &st->r_frame_rate.den);
556 if (st->r_frame_rate.num >= 1000LL*st->r_frame_rate.den)
557 st->r_frame_rate.num = st->r_frame_rate.den = 0;
558 continue;
559 }
560
561 if (metadata && av_strcasecmp(name, "Uses") &&
562 av_strcasecmp(name, "Depends") && av_strcasecmp(name, "Replaces")) {
563 if (event_flags)
564 *event_flags |= metadata_flag;
565 av_dict_set(metadata, name, str_value, 0);
566 }
567 }
568 }
569
570 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
571 av_log(s, AV_LOG_ERROR, "info header checksum mismatch\n");
572 return AVERROR_INVALIDDATA;
573 }
574 return 0;
575}
576
577static int decode_syncpoint(NUTContext *nut, int64_t *ts, int64_t *back_ptr)
578{
579 AVFormatContext *s = nut->avf;
580 AVIOContext *bc = s->pb;
581 int64_t end;
582 uint64_t tmp;
583 int ret;
584
585 nut->last_syncpoint_pos = avio_tell(bc) - 8;
586
587 end = get_packetheader(nut, bc, 1, SYNCPOINT_STARTCODE);
588 end += avio_tell(bc);
589
590 tmp = ffio_read_varlen(bc);
591 *back_ptr = nut->last_syncpoint_pos - 16 * ffio_read_varlen(bc);
592 if (*back_ptr < 0)
593 return AVERROR_INVALIDDATA;
594
595 ff_nut_reset_ts(nut, nut->time_base[tmp % nut->time_base_count],
596 tmp / nut->time_base_count);
597
598 if (nut->flags & NUT_BROADCAST) {
599 tmp = ffio_read_varlen(bc);
600 av_log(s, AV_LOG_VERBOSE, "Syncpoint wallclock %"PRId64"\n",
601 av_rescale_q(tmp / nut->time_base_count,
602 nut->time_base[tmp % nut->time_base_count],
603 AV_TIME_BASE_Q));
604 }
605
606 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
607 av_log(s, AV_LOG_ERROR, "sync point checksum mismatch\n");
608 return AVERROR_INVALIDDATA;
609 }
610
611 *ts = tmp / nut->time_base_count *
612 av_q2d(nut->time_base[tmp % nut->time_base_count]) * AV_TIME_BASE;
613
614 if ((ret = ff_nut_add_sp(nut, nut->last_syncpoint_pos, *back_ptr, *ts)) < 0)
615 return ret;
616
617 return 0;
618}
619
620//FIXME calculate exactly, this is just a good approximation.
621static int64_t find_duration(NUTContext *nut, int64_t filesize)
622{
623 AVFormatContext *s = nut->avf;
624 int64_t duration = 0;
625
626 ff_find_last_ts(s, -1, &duration, NULL, nut_read_timestamp);
627
628 if(duration > 0)
629 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
630 return duration;
631}
632
633static int find_and_decode_index(NUTContext *nut)
634{
635 AVFormatContext *s = nut->avf;
636 AVIOContext *bc = s->pb;
637 uint64_t tmp, end;
638 int i, j, syncpoint_count;
639 int64_t filesize = avio_size(bc);
640 int64_t *syncpoints;
641 uint64_t max_pts;
642 int8_t *has_keyframe;
643 int ret = AVERROR_INVALIDDATA;
644
645 if(filesize <= 0)
646 return -1;
647
648 avio_seek(bc, filesize - 12, SEEK_SET);
649 avio_seek(bc, filesize - avio_rb64(bc), SEEK_SET);
650 if (avio_rb64(bc) != INDEX_STARTCODE) {
651 av_log(s, AV_LOG_ERROR, "no index at the end\n");
652
653 if(s->duration<=0)
654 s->duration = find_duration(nut, filesize);
655 return ret;
656 }
657
658 end = get_packetheader(nut, bc, 1, INDEX_STARTCODE);
659 end += avio_tell(bc);
660
661 max_pts = ffio_read_varlen(bc);
662 s->duration = av_rescale_q(max_pts / nut->time_base_count,
663 nut->time_base[max_pts % nut->time_base_count],
664 AV_TIME_BASE_Q);
665 s->duration_estimation_method = AVFMT_DURATION_FROM_PTS;
666
667 GET_V(syncpoint_count, tmp < INT_MAX / 8 && tmp > 0);
668 syncpoints = av_malloc_array(syncpoint_count, sizeof(int64_t));
669 has_keyframe = av_malloc_array(syncpoint_count + 1, sizeof(int8_t));
670 if (!syncpoints || !has_keyframe) {
671 ret = AVERROR(ENOMEM);
672 goto fail;
673 }
674 for (i = 0; i < syncpoint_count; i++) {
675 syncpoints[i] = ffio_read_varlen(bc);
676 if (syncpoints[i] <= 0)
677 goto fail;
678 if (i)
679 syncpoints[i] += syncpoints[i - 1];
680 }
681
682 for (i = 0; i < s->nb_streams; i++) {
683 int64_t last_pts = -1;
684 for (j = 0; j < syncpoint_count;) {
685 uint64_t x = ffio_read_varlen(bc);
686 int type = x & 1;
687 int n = j;
688 x >>= 1;
689 if (type) {
690 int flag = x & 1;
691 x >>= 1;
692 if (n + x >= syncpoint_count + 1) {
693 av_log(s, AV_LOG_ERROR, "index overflow A %d + %"PRIu64" >= %d\n", n, x, syncpoint_count + 1);
694 goto fail;
695 }
696 while (x--)
697 has_keyframe[n++] = flag;
698 has_keyframe[n++] = !flag;
699 } else {
700 while (x != 1) {
701 if (n >= syncpoint_count + 1) {
702 av_log(s, AV_LOG_ERROR, "index overflow B\n");
703 goto fail;
704 }
705 has_keyframe[n++] = x & 1;
706 x >>= 1;
707 }
708 }
709 if (has_keyframe[0]) {
710 av_log(s, AV_LOG_ERROR, "keyframe before first syncpoint in index\n");
711 goto fail;
712 }
713 av_assert0(n <= syncpoint_count + 1);
714 for (; j < n && j < syncpoint_count; j++) {
715 if (has_keyframe[j]) {
716 uint64_t B, A = ffio_read_varlen(bc);
717 if (!A) {
718 A = ffio_read_varlen(bc);
719 B = ffio_read_varlen(bc);
720 // eor_pts[j][i] = last_pts + A + B
721 } else
722 B = 0;
723 av_add_index_entry(s->streams[i], 16 * syncpoints[j - 1],
724 last_pts + A, 0, 0, AVINDEX_KEYFRAME);
725 last_pts += A + B;
726 }
727 }
728 }
729 }
730
731 if (skip_reserved(bc, end) || ffio_get_checksum(bc)) {
732 av_log(s, AV_LOG_ERROR, "index checksum mismatch\n");
733 goto fail;
734 }
735 ret = 0;
736
737fail:
738 av_free(syncpoints);
739 av_free(has_keyframe);
740 return ret;
741}
742
743static int nut_read_header(AVFormatContext *s)
744{
745 NUTContext *nut = s->priv_data;
746 AVIOContext *bc = s->pb;
747 int64_t pos;
748 int initialized_stream_count;
749
750 nut->avf = s;
751
752 /* main header */
753 pos = 0;
754 do {
755 pos = find_startcode(bc, MAIN_STARTCODE, pos) + 1;
756 if (pos < 0 + 1) {
757 av_log(s, AV_LOG_ERROR, "No main startcode found.\n");
758 return AVERROR_INVALIDDATA;
759 }
760 } while (decode_main_header(nut) < 0);
761
762 /* stream headers */
763 pos = 0;
764 for (initialized_stream_count = 0; initialized_stream_count < s->nb_streams;) {
765 pos = find_startcode(bc, STREAM_STARTCODE, pos) + 1;
766 if (pos < 0 + 1) {
767 av_log(s, AV_LOG_ERROR, "Not all stream headers found.\n");
768 return AVERROR_INVALIDDATA;
769 }
770 if (decode_stream_header(nut) >= 0)
771 initialized_stream_count++;
772 }
773
774 /* info headers */
775 pos = 0;
776 for (;;) {
777 uint64_t startcode = find_any_startcode(bc, pos);
778 pos = avio_tell(bc);
779
780 if (startcode == 0) {
781 av_log(s, AV_LOG_ERROR, "EOF before video frames\n");
782 return AVERROR_INVALIDDATA;
783 } else if (startcode == SYNCPOINT_STARTCODE) {
784 nut->next_startcode = startcode;
785 break;
786 } else if (startcode != INFO_STARTCODE) {
787 continue;
788 }
789
790 decode_info_header(nut);
791 }
792
793 s->data_offset = pos - 8;
794
795 if (bc->seekable) {
796 int64_t orig_pos = avio_tell(bc);
797 find_and_decode_index(nut);
798 avio_seek(bc, orig_pos, SEEK_SET);
799 }
800 av_assert0(nut->next_startcode == SYNCPOINT_STARTCODE);
801
802 ff_metadata_conv_ctx(s, NULL, ff_nut_metadata_conv);
803
804 return 0;
805}
806
807static int read_sm_data(AVFormatContext *s, AVIOContext *bc, AVPacket *pkt, int is_meta, int64_t maxpos)
808{
809 int count = ffio_read_varlen(bc);
810 int skip_start = 0;
811 int skip_end = 0;
812 int channels = 0;
813 int64_t channel_layout = 0;
814 int sample_rate = 0;
815 int width = 0;
816 int height = 0;
817 int i;
818
819 for (i=0; i<count; i++) {
820 uint8_t name[256], str_value[256], type_str[256];
821 int value;
822 if (avio_tell(bc) >= maxpos)
823 return AVERROR_INVALIDDATA;
824 get_str(bc, name, sizeof(name));
825 value = get_s(bc);
826
827 if (value == -1) {
828 get_str(bc, str_value, sizeof(str_value));
829 av_log(s, AV_LOG_WARNING, "Unknown string %s / %s\n", name, str_value);
830 } else if (value == -2) {
831 uint8_t *dst = NULL;
832 int64_t v64, value_len;
833
834 get_str(bc, type_str, sizeof(type_str));
835 value_len = ffio_read_varlen(bc);
836 if (avio_tell(bc) + value_len >= maxpos)
837 return AVERROR_INVALIDDATA;
838 if (!strcmp(name, "Palette")) {
839 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, value_len);
840 } else if (!strcmp(name, "Extradata")) {
841 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, value_len);
842 } else if (sscanf(name, "CodecSpecificSide%"SCNd64"", &v64) == 1) {
843 dst = av_packet_new_side_data(pkt, AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL, value_len + 8);
844 if(!dst)
845 return AVERROR(ENOMEM);
846 AV_WB64(dst, v64);
847 dst += 8;
848 } else if (!strcmp(name, "ChannelLayout") && value_len == 8) {
849 channel_layout = avio_rl64(bc);
850 continue;
851 } else {
852 av_log(s, AV_LOG_WARNING, "Unknown data %s / %s\n", name, type_str);
853 avio_skip(bc, value_len);
854 continue;
855 }
856 if(!dst)
857 return AVERROR(ENOMEM);
858 avio_read(bc, dst, value_len);
859 } else if (value == -3) {
860 value = get_s(bc);
861 } else if (value == -4) {
862 value = ffio_read_varlen(bc);
863 } else if (value < -4) {
864 get_s(bc);
865 } else {
866 if (!strcmp(name, "SkipStart")) {
867 skip_start = value;
868 } else if (!strcmp(name, "SkipEnd")) {
869 skip_end = value;
870 } else if (!strcmp(name, "Channels")) {
871 channels = value;
872 } else if (!strcmp(name, "SampleRate")) {
873 sample_rate = value;
874 } else if (!strcmp(name, "Width")) {
875 width = value;
876 } else if (!strcmp(name, "Height")) {
877 height = value;
878 } else {
879 av_log(s, AV_LOG_WARNING, "Unknown integer %s\n", name);
880 }
881 }
882 }
883
884 if (channels || channel_layout || sample_rate || width || height) {
885 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_PARAM_CHANGE, 28);
886 if (!dst)
887 return AVERROR(ENOMEM);
888 bytestream_put_le32(&dst,
889 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_COUNT*(!!channels) +
890 AV_SIDE_DATA_PARAM_CHANGE_CHANNEL_LAYOUT*(!!channel_layout) +
891 AV_SIDE_DATA_PARAM_CHANGE_SAMPLE_RATE*(!!sample_rate) +
892 AV_SIDE_DATA_PARAM_CHANGE_DIMENSIONS*(!!(width|height))
893 );
894 if (channels)
895 bytestream_put_le32(&dst, channels);
896 if (channel_layout)
897 bytestream_put_le64(&dst, channel_layout);
898 if (sample_rate)
899 bytestream_put_le32(&dst, sample_rate);
900 if (width || height){
901 bytestream_put_le32(&dst, width);
902 bytestream_put_le32(&dst, height);
903 }
904 }
905
906 if (skip_start || skip_end) {
907 uint8_t *dst = av_packet_new_side_data(pkt, AV_PKT_DATA_SKIP_SAMPLES, 10);
908 if (!dst)
909 return AVERROR(ENOMEM);
910 AV_WL32(dst, skip_start);
911 AV_WL32(dst+4, skip_end);
912 }
913
914 return 0;
915}
916
917static int decode_frame_header(NUTContext *nut, int64_t *pts, int *stream_id,
918 uint8_t *header_idx, int frame_code)
919{
920 AVFormatContext *s = nut->avf;
921 AVIOContext *bc = s->pb;
922 StreamContext *stc;
923 int size, flags, size_mul, pts_delta, i, reserved_count;
924 uint64_t tmp;
925
926 if (!(nut->flags & NUT_PIPE) &&
927 avio_tell(bc) > nut->last_syncpoint_pos + nut->max_distance) {
928 av_log(s, AV_LOG_ERROR,
929 "Last frame must have been damaged %"PRId64" > %"PRId64" + %d\n",
930 avio_tell(bc), nut->last_syncpoint_pos, nut->max_distance);
931 return AVERROR_INVALIDDATA;
932 }
933
934 flags = nut->frame_code[frame_code].flags;
935 size_mul = nut->frame_code[frame_code].size_mul;
936 size = nut->frame_code[frame_code].size_lsb;
937 *stream_id = nut->frame_code[frame_code].stream_id;
938 pts_delta = nut->frame_code[frame_code].pts_delta;
939 reserved_count = nut->frame_code[frame_code].reserved_count;
940 *header_idx = nut->frame_code[frame_code].header_idx;
941
942 if (flags & FLAG_INVALID)
943 return AVERROR_INVALIDDATA;
944 if (flags & FLAG_CODED)
945 flags ^= ffio_read_varlen(bc);
946 if (flags & FLAG_STREAM_ID) {
947 GET_V(*stream_id, tmp < s->nb_streams);
948 }
949 stc = &nut->stream[*stream_id];
950 if (flags & FLAG_CODED_PTS) {
951 int coded_pts = ffio_read_varlen(bc);
952 // FIXME check last_pts validity?
953 if (coded_pts < (1 << stc->msb_pts_shift)) {
954 *pts = ff_lsb2full(stc, coded_pts);
955 } else
956 *pts = coded_pts - (1LL << stc->msb_pts_shift);
957 } else
958 *pts = stc->last_pts + pts_delta;
959 if (flags & FLAG_SIZE_MSB)
960 size += size_mul * ffio_read_varlen(bc);
961 if (flags & FLAG_MATCH_TIME)
962 get_s(bc);
963 if (flags & FLAG_HEADER_IDX)
964 *header_idx = ffio_read_varlen(bc);
965 if (flags & FLAG_RESERVED)
966 reserved_count = ffio_read_varlen(bc);
967 for (i = 0; i < reserved_count; i++)
968 ffio_read_varlen(bc);
969
970 if (*header_idx >= (unsigned)nut->header_count) {
971 av_log(s, AV_LOG_ERROR, "header_idx invalid\n");
972 return AVERROR_INVALIDDATA;
973 }
974 if (size > 4096)
975 *header_idx = 0;
976 size -= nut->header_len[*header_idx];
977
978 if (flags & FLAG_CHECKSUM) {
979 avio_rb32(bc); // FIXME check this
980 } else if (!(nut->flags & NUT_PIPE) &&
981 size > 2 * nut->max_distance ||
982 FFABS(stc->last_pts - *pts) > stc->max_pts_distance) {
983 av_log(s, AV_LOG_ERROR, "frame size > 2max_distance and no checksum\n");
984 return AVERROR_INVALIDDATA;
985 }
986
987 stc->last_pts = *pts;
988 stc->last_flags = flags;
989
990 return size;
991}
992
993static int decode_frame(NUTContext *nut, AVPacket *pkt, int frame_code)
994{
995 AVFormatContext *s = nut->avf;
996 AVIOContext *bc = s->pb;
f6fa7814 997 int size, stream_id, discard, ret;
2ba45a60
DM		 998 int64_t pts, last_IP_pts;
999 StreamContext *stc;
1000 uint8_t header_idx;
2ba45a60
DM		 1001
1002 size = decode_frame_header(nut, &pts, &stream_id, &header_idx, frame_code);
1003 if (size < 0)
1004 return size;
1005
1006 stc = &nut->stream[stream_id];
1007
1008 if (stc->last_flags & FLAG_KEY)
1009 stc->skip_until_key_frame = 0;
1010
1011 discard = s->streams[stream_id]->discard;
1012 last_IP_pts = s->streams[stream_id]->last_IP_pts;
1013 if ((discard >= AVDISCARD_NONKEY && !(stc->last_flags & FLAG_KEY)) ||
1014 (discard >= AVDISCARD_BIDIR && last_IP_pts != AV_NOPTS_VALUE &&
1015 last_IP_pts > pts) ||
1016 discard >= AVDISCARD_ALL ||
1017 stc->skip_until_key_frame) {
1018 avio_skip(bc, size);
1019 return 1;
1020 }
1021
f6fa7814
DM		 1022 ret = av_new_packet(pkt, size + nut->header_len[header_idx]);
1023 if (ret < 0)
1024 return ret;
2ba45a60
DM		 1025 memcpy(pkt->data, nut->header[header_idx], nut->header_len[header_idx]);
1026 pkt->pos = avio_tell(bc); // FIXME
1027 if (stc->last_flags & FLAG_SM_DATA) {
1028 int sm_size;
1029 if (read_sm_data(s, bc, pkt, 0, pkt->pos + size) < 0)
1030 return AVERROR_INVALIDDATA;
1031 if (read_sm_data(s, bc, pkt, 1, pkt->pos + size) < 0)
1032 return AVERROR_INVALIDDATA;
1033 sm_size = avio_tell(bc) - pkt->pos;
1034 size -= sm_size;
1035 pkt->size -= sm_size;
1036 }
1037
1038 ret = avio_read(bc, pkt->data + nut->header_len[header_idx], size);
1039 if (ret != size) {
1040 if (ret < 0)
1041 return ret;
1042 }
1043 av_shrink_packet(pkt, nut->header_len[header_idx] + ret);
1044
1045 pkt->stream_index = stream_id;
1046 if (stc->last_flags & FLAG_KEY)
1047 pkt->flags |= AV_PKT_FLAG_KEY;
1048 pkt->pts = pts;
1049
1050 return 0;
1051}
1052
1053static int nut_read_packet(AVFormatContext *s, AVPacket *pkt)
1054{
1055 NUTContext *nut = s->priv_data;
1056 AVIOContext *bc = s->pb;
1057 int i, frame_code = 0, ret, skip;
1058 int64_t ts, back_ptr;
1059
1060 for (;;) {
1061 int64_t pos = avio_tell(bc);
1062 uint64_t tmp = nut->next_startcode;
1063 nut->next_startcode = 0;
1064
1065 if (tmp) {
1066 pos -= 8;
1067 } else {
1068 frame_code = avio_r8(bc);
1069 if (avio_feof(bc))
1070 return AVERROR_EOF;
1071 if (frame_code == 'N') {
1072 tmp = frame_code;
1073 for (i = 1; i < 8; i++)
1074 tmp = (tmp << 8) + avio_r8(bc);
1075 }
1076 }
1077 switch (tmp) {
1078 case MAIN_STARTCODE:
1079 case STREAM_STARTCODE:
1080 case INDEX_STARTCODE:
1081 skip = get_packetheader(nut, bc, 0, tmp);
1082 avio_skip(bc, skip);
1083 break;
1084 case INFO_STARTCODE:
1085 if (decode_info_header(nut) < 0)
1086 goto resync;
1087 break;
1088 case SYNCPOINT_STARTCODE:
1089 if (decode_syncpoint(nut, &ts, &back_ptr) < 0)
1090 goto resync;
1091 frame_code = avio_r8(bc);
1092 case 0:
1093 ret = decode_frame(nut, pkt, frame_code);
1094 if (ret == 0)
1095 return 0;
1096 else if (ret == 1) // OK but discard packet
1097 break;
1098 default:
1099resync:
1100 av_log(s, AV_LOG_DEBUG, "syncing from %"PRId64"\n", pos);
1101 tmp = find_any_startcode(bc, nut->last_syncpoint_pos + 1);
1102 if (tmp == 0)
1103 return AVERROR_INVALIDDATA;
1104 av_log(s, AV_LOG_DEBUG, "sync\n");
1105 nut->next_startcode = tmp;
1106 }
1107 }
1108}
1109
1110static int64_t nut_read_timestamp(AVFormatContext *s, int stream_index,
1111 int64_t *pos_arg, int64_t pos_limit)
1112{
1113 NUTContext *nut = s->priv_data;
1114 AVIOContext *bc = s->pb;
1115 int64_t pos, pts, back_ptr;
1116 av_log(s, AV_LOG_DEBUG, "read_timestamp(X,%d,%"PRId64",%"PRId64")\n",
1117 stream_index, *pos_arg, pos_limit);
1118
1119 pos = *pos_arg;
1120 do {
1121 pos = find_startcode(bc, SYNCPOINT_STARTCODE, pos) + 1;
1122 if (pos < 1) {
1123 av_log(s, AV_LOG_ERROR, "read_timestamp failed.\n");
1124 return AV_NOPTS_VALUE;
1125 }
1126 } while (decode_syncpoint(nut, &pts, &back_ptr) < 0);
1127 *pos_arg = pos - 1;
1128 av_assert0(nut->last_syncpoint_pos == *pos_arg);
1129
1130 av_log(s, AV_LOG_DEBUG, "return %"PRId64" %"PRId64"\n", pts, back_ptr);
1131 if (stream_index == -2)
1132 return back_ptr;
1133 av_assert0(stream_index == -1);
1134 return pts;
1135}
1136
1137static int read_seek(AVFormatContext *s, int stream_index,
1138 int64_t pts, int flags)
1139{
1140 NUTContext *nut = s->priv_data;
1141 AVStream *st = s->streams[stream_index];
1142 Syncpoint dummy = { .ts = pts * av_q2d(st->time_base) * AV_TIME_BASE };
1143 Syncpoint nopts_sp = { .ts = AV_NOPTS_VALUE, .back_ptr = AV_NOPTS_VALUE };
1144 Syncpoint *sp, *next_node[2] = { &nopts_sp, &nopts_sp };
1145 int64_t pos, pos2, ts;
1146 int i;
1147
1148 if (nut->flags & NUT_PIPE) {
1149 return AVERROR(ENOSYS);
1150 }
1151
1152 if (st->index_entries) {
1153 int index = av_index_search_timestamp(st, pts, flags);
1154 if (index < 0)
1155 index = av_index_search_timestamp(st, pts, flags ^ AVSEEK_FLAG_BACKWARD);
1156 if (index < 0)
1157 return -1;
1158
1159 pos2 = st->index_entries[index].pos;
1160 ts = st->index_entries[index].timestamp;
1161 } else {
1162 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pts_cmp,
1163 (void **) next_node);
1164 av_log(s, AV_LOG_DEBUG, "%"PRIu64"-%"PRIu64" %"PRId64"-%"PRId64"\n",
1165 next_node[0]->pos, next_node[1]->pos, next_node[0]->ts,
1166 next_node[1]->ts);
1167 pos = ff_gen_search(s, -1, dummy.ts, next_node[0]->pos,
1168 next_node[1]->pos, next_node[1]->pos,
1169 next_node[0]->ts, next_node[1]->ts,
1170 AVSEEK_FLAG_BACKWARD, &ts, nut_read_timestamp);
1171
1172 if (!(flags & AVSEEK_FLAG_BACKWARD)) {
1173 dummy.pos = pos + 16;
1174 next_node[1] = &nopts_sp;
1175 av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
1176 (void **) next_node);
1177 pos2 = ff_gen_search(s, -2, dummy.pos, next_node[0]->pos,
1178 next_node[1]->pos, next_node[1]->pos,
1179 next_node[0]->back_ptr, next_node[1]->back_ptr,
1180 flags, &ts, nut_read_timestamp);
1181 if (pos2 >= 0)
1182 pos = pos2;
1183 // FIXME dir but I think it does not matter
1184 }
1185 dummy.pos = pos;
1186 sp = av_tree_find(nut->syncpoints, &dummy, (void *) ff_nut_sp_pos_cmp,
1187 NULL);
1188
1189 av_assert0(sp);
1190 pos2 = sp->back_ptr - 15;
1191 }
1192 av_log(NULL, AV_LOG_DEBUG, "SEEKTO: %"PRId64"\n", pos2);
1193 pos = find_startcode(s->pb, SYNCPOINT_STARTCODE, pos2);
1194 avio_seek(s->pb, pos, SEEK_SET);
1195 av_log(NULL, AV_LOG_DEBUG, "SP: %"PRId64"\n", pos);
1196 if (pos2 > pos || pos2 + 15 < pos)
1197 av_log(NULL, AV_LOG_ERROR, "no syncpoint at backptr pos\n");
1198 for (i = 0; i < s->nb_streams; i++)
1199 nut->stream[i].skip_until_key_frame = 1;
1200
1201 return 0;
1202}
1203
1204static int nut_read_close(AVFormatContext *s)
1205{
1206 NUTContext *nut = s->priv_data;
1207 int i;
1208
1209 av_freep(&nut->time_base);
1210 av_freep(&nut->stream);
1211 ff_nut_free_sp(nut);
1212 for (i = 1; i < nut->header_count; i++)
1213 av_freep(&nut->header[i]);
1214
1215 return 0;
1216}
1217
1218AVInputFormat ff_nut_demuxer = {
1219 .name = "nut",
1220 .long_name = NULL_IF_CONFIG_SMALL("NUT"),
1221 .flags = AVFMT_SEEK_TO_PTS,
1222 .priv_data_size = sizeof(NUTContext),
1223 .read_probe = nut_probe,
1224 .read_header = nut_read_header,
1225 .read_packet = nut_read_packet,
1226 .read_close = nut_read_close,
1227 .read_seek = read_seek,
1228 .extensions = "nut",
1229 .codec_tag = ff_nut_codec_tags,
1230};
ffmpeg Piment Noir Debian package repository