1 /*
2 * Copyright (c) 2011, Luca Barbato
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /**
22 * @file generic segmenter
23 * M3U8 specification can be find here:
24 * @url{http://tools.ietf.org/id/draft-pantos-http-live-streaming}
25 */
26
27 #include "config_components.h"
28
29 #include <time.h>
30
31 #include "avformat.h"
32 #include "internal.h"
33 #include "mux.h"
34
35 #include "libavutil/avassert.h"
36 #include "libavutil/internal.h"
37 #include "libavutil/log.h"
38 #include "libavutil/opt.h"
39 #include "libavutil/avstring.h"
40 #include "libavutil/parseutils.h"
41 #include "libavutil/mathematics.h"
42 #include "libavutil/time.h"
43 #include "libavutil/timecode.h"
44 #include "libavutil/time_internal.h"
45 #include "libavutil/timestamp.h"
46
47 typedef struct SegmentListEntry {
48 int index;
49 double start_time, end_time;
50 int64_t start_pts;
51 int64_t offset_pts;
52 char *filename;
53 struct SegmentListEntry *next;
54 int64_t last_duration;
55 } SegmentListEntry;
56
57 typedef enum {
58 LIST_TYPE_UNDEFINED = -1,
59 LIST_TYPE_FLAT = 0,
60 LIST_TYPE_CSV,
61 LIST_TYPE_M3U8,
62 LIST_TYPE_EXT, ///< deprecated
63 LIST_TYPE_FFCONCAT,
64 LIST_TYPE_NB,
65 } ListType;
66
67 #define SEGMENT_LIST_FLAG_CACHE 1
68 #define SEGMENT_LIST_FLAG_LIVE 2
69
70 typedef struct SegmentContext {
71 const AVClass *class; /**< Class for private options. */
72 int segment_idx; ///< index of the segment file to write, starting from 0
73 int segment_idx_wrap; ///< number after which the index wraps
74 int segment_idx_wrap_nb; ///< number of time the index has wraped
75 int segment_count; ///< number of segment files already written
76 const AVOutputFormat *oformat;
77 AVFormatContext *avf;
78 char *format; ///< format to use for output segment files
79 AVDictionary *format_options;
80 char *list; ///< filename for the segment list file
81 int list_flags; ///< flags affecting list generation
82 int list_size; ///< number of entries for the segment list file
83
84 int is_nullctx; ///< whether avf->pb is a nullctx
85 int use_clocktime; ///< flag to cut segments at regular clock time
86 int64_t clocktime_offset; //< clock offset for cutting the segments at regular clock time
87 int64_t clocktime_wrap_duration; //< wrapping duration considered for starting a new segment
88 int64_t last_val; ///< remember last time for wrap around detection
89 int cut_pending;
90 int header_written; ///< whether we've already called avformat_write_header
91
92 char *entry_prefix; ///< prefix to add to list entry filenames
93 int list_type; ///< set the list type
94 AVIOContext *list_pb; ///< list file put-byte context
95 int64_t time; ///< segment duration
96 int use_strftime; ///< flag to expand filename with strftime
97 int increment_tc; ///< flag to increment timecode if found
98
99 char *times_str; ///< segment times specification string
100 int64_t *times; ///< list of segment interval specification
101 int nb_times; ///< number of elments in the times array
102
103 char *frames_str; ///< segment frame numbers specification string
104 int *frames; ///< list of frame number specification
105 int nb_frames; ///< number of elments in the frames array
106 int frame_count; ///< total number of reference frames
107 int segment_frame_count; ///< number of reference frames in the segment
108
109 int64_t time_delta;
110 int individual_header_trailer; /**< Set by a private option. */
111 int write_header_trailer; /**< Set by a private option. */
112 char *header_filename; ///< filename to write the output header to
113
114 int reset_timestamps; ///< reset timestamps at the beginning of each segment
115 int64_t initial_offset; ///< initial timestamps offset, expressed in microseconds
116 char *reference_stream_specifier; ///< reference stream specifier
117 int reference_stream_index;
118 int break_non_keyframes;
119 int write_empty;
120
121 int use_rename;
122 char temp_list_filename[1024];
123
124 SegmentListEntry cur_entry;
125 SegmentListEntry *segment_list_entries;
126 SegmentListEntry *segment_list_entries_end;
127 } SegmentContext;
128
print_csv_escaped_str(AVIOContext * ctx,const char * str)129 static void print_csv_escaped_str(AVIOContext *ctx, const char *str)
130 {
131 int needs_quoting = !!str[strcspn(str, "\",\n\r")];
132
133 if (needs_quoting)
134 avio_w8(ctx, '"');
135
136 for (; *str; str++) {
137 if (*str == '"')
138 avio_w8(ctx, '"');
139 avio_w8(ctx, *str);
140 }
141 if (needs_quoting)
142 avio_w8(ctx, '"');
143 }
144
segment_mux_init(AVFormatContext * s)145 static int segment_mux_init(AVFormatContext *s)
146 {
147 SegmentContext *seg = s->priv_data;
148 AVFormatContext *oc;
149 int i;
150 int ret;
151
152 ret = avformat_alloc_output_context2(&seg->avf, seg->oformat, NULL, NULL);
153 if (ret < 0)
154 return ret;
155 oc = seg->avf;
156
157 oc->interrupt_callback = s->interrupt_callback;
158 oc->max_delay = s->max_delay;
159 av_dict_copy(&oc->metadata, s->metadata, 0);
160 oc->opaque = s->opaque;
161 oc->io_close = s->io_close;
162 oc->io_close2 = s->io_close2;
163 oc->io_open = s->io_open;
164 oc->flags = s->flags;
165
166 for (i = 0; i < s->nb_streams; i++) {
167 AVStream *st, *ist = s->streams[i];
168 AVCodecParameters *ipar = ist->codecpar, *opar;
169
170 if (!(st = avformat_new_stream(oc, NULL)))
171 return AVERROR(ENOMEM);
172 ret = ff_stream_encode_params_copy(st, ist);
173 if (ret < 0)
174 return ret;
175 opar = st->codecpar;
176 if (!oc->oformat->codec_tag ||
177 av_codec_get_id (oc->oformat->codec_tag, ipar->codec_tag) == opar->codec_id ||
178 av_codec_get_tag(oc->oformat->codec_tag, ipar->codec_id) <= 0) {
179 opar->codec_tag = ipar->codec_tag;
180 } else {
181 opar->codec_tag = 0;
182 }
183 }
184
185 return 0;
186 }
187
set_segment_filename(AVFormatContext * s)188 static int set_segment_filename(AVFormatContext *s)
189 {
190 SegmentContext *seg = s->priv_data;
191 AVFormatContext *oc = seg->avf;
192 size_t size;
193 int ret;
194 char buf[1024];
195 char *new_name;
196
197 if (seg->segment_idx_wrap)
198 seg->segment_idx %= seg->segment_idx_wrap;
199 if (seg->use_strftime) {
200 time_t now0;
201 struct tm *tm, tmpbuf;
202 time(&now0);
203 tm = localtime_r(&now0, &tmpbuf);
204 if (!strftime(buf, sizeof(buf), s->url, tm)) {
205 av_log(oc, AV_LOG_ERROR, "Could not get segment filename with strftime\n");
206 return AVERROR(EINVAL);
207 }
208 } else if (av_get_frame_filename(buf, sizeof(buf),
209 s->url, seg->segment_idx) < 0) {
210 av_log(oc, AV_LOG_ERROR, "Invalid segment filename template '%s'\n", s->url);
211 return AVERROR(EINVAL);
212 }
213 new_name = av_strdup(buf);
214 if (!new_name)
215 return AVERROR(ENOMEM);
216 ff_format_set_url(oc, new_name);
217
218 /* copy modified name in list entry */
219 size = strlen(av_basename(oc->url)) + 1;
220 if (seg->entry_prefix)
221 size += strlen(seg->entry_prefix);
222
223 if ((ret = av_reallocp(&seg->cur_entry.filename, size)) < 0)
224 return ret;
225 snprintf(seg->cur_entry.filename, size, "%s%s",
226 seg->entry_prefix ? seg->entry_prefix : "",
227 av_basename(oc->url));
228
229 return 0;
230 }
231
segment_start(AVFormatContext * s,int write_header)232 static int segment_start(AVFormatContext *s, int write_header)
233 {
234 SegmentContext *seg = s->priv_data;
235 AVFormatContext *oc = seg->avf;
236 int err = 0;
237
238 if (write_header) {
239 avformat_free_context(oc);
240 seg->avf = NULL;
241 if ((err = segment_mux_init(s)) < 0)
242 return err;
243 oc = seg->avf;
244 }
245
246 seg->segment_idx++;
247 if ((seg->segment_idx_wrap) && (seg->segment_idx % seg->segment_idx_wrap == 0))
248 seg->segment_idx_wrap_nb++;
249
250 if ((err = set_segment_filename(s)) < 0)
251 return err;
252
253 if ((err = s->io_open(s, &oc->pb, oc->url, AVIO_FLAG_WRITE, NULL)) < 0) {
254 av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->url);
255 return err;
256 }
257 if (!seg->individual_header_trailer)
258 oc->pb->seekable = 0;
259
260 if (oc->oformat->priv_class && oc->priv_data)
261 av_opt_set(oc->priv_data, "mpegts_flags", "+resend_headers", 0);
262
263 if (write_header) {
264 AVDictionary *options = NULL;
265 av_dict_copy(&options, seg->format_options, 0);
266 av_dict_set(&options, "fflags", "-autobsf", 0);
267 err = avformat_write_header(oc, &options);
268 av_dict_free(&options);
269 if (err < 0)
270 return err;
271 }
272
273 seg->segment_frame_count = 0;
274 return 0;
275 }
276
segment_list_open(AVFormatContext * s)277 static int segment_list_open(AVFormatContext *s)
278 {
279 SegmentContext *seg = s->priv_data;
280 int ret;
281
282 snprintf(seg->temp_list_filename, sizeof(seg->temp_list_filename), seg->use_rename ? "%s.tmp" : "%s", seg->list);
283 ret = s->io_open(s, &seg->list_pb, seg->temp_list_filename, AVIO_FLAG_WRITE, NULL);
284 if (ret < 0) {
285 av_log(s, AV_LOG_ERROR, "Failed to open segment list '%s'\n", seg->list);
286 return ret;
287 }
288
289 if (seg->list_type == LIST_TYPE_M3U8 && seg->segment_list_entries) {
290 SegmentListEntry *entry;
291 double max_duration = 0;
292
293 avio_printf(seg->list_pb, "#EXTM3U\n");
294 avio_printf(seg->list_pb, "#EXT-X-VERSION:3\n");
295 avio_printf(seg->list_pb, "#EXT-X-MEDIA-SEQUENCE:%d\n", seg->segment_list_entries->index);
296 avio_printf(seg->list_pb, "#EXT-X-ALLOW-CACHE:%s\n",
297 seg->list_flags & SEGMENT_LIST_FLAG_CACHE ? "YES" : "NO");
298
299 av_log(s, AV_LOG_VERBOSE, "EXT-X-MEDIA-SEQUENCE:%d\n",
300 seg->segment_list_entries->index);
301
302 for (entry = seg->segment_list_entries; entry; entry = entry->next)
303 max_duration = FFMAX(max_duration, entry->end_time - entry->start_time);
304 avio_printf(seg->list_pb, "#EXT-X-TARGETDURATION:%"PRId64"\n", (int64_t)ceil(max_duration));
305 } else if (seg->list_type == LIST_TYPE_FFCONCAT) {
306 avio_printf(seg->list_pb, "ffconcat version 1.0\n");
307 }
308
309 return ret;
310 }
311
segment_list_print_entry(AVIOContext * list_ioctx,ListType list_type,const SegmentListEntry * list_entry,void * log_ctx)312 static void segment_list_print_entry(AVIOContext *list_ioctx,
313 ListType list_type,
314 const SegmentListEntry *list_entry,
315 void *log_ctx)
316 {
317 switch (list_type) {
318 case LIST_TYPE_FLAT:
319 avio_printf(list_ioctx, "%s\n", list_entry->filename);
320 break;
321 case LIST_TYPE_CSV:
322 case LIST_TYPE_EXT:
323 print_csv_escaped_str(list_ioctx, list_entry->filename);
324 avio_printf(list_ioctx, ",%f,%f\n", list_entry->start_time, list_entry->end_time);
325 break;
326 case LIST_TYPE_M3U8:
327 avio_printf(list_ioctx, "#EXTINF:%f,\n%s\n",
328 list_entry->end_time - list_entry->start_time, list_entry->filename);
329 break;
330 case LIST_TYPE_FFCONCAT:
331 {
332 char *buf;
333 if (av_escape(&buf, list_entry->filename, NULL, AV_ESCAPE_MODE_AUTO, AV_ESCAPE_FLAG_WHITESPACE) < 0) {
334 av_log(log_ctx, AV_LOG_WARNING,
335 "Error writing list entry '%s' in list file\n", list_entry->filename);
336 return;
337 }
338 avio_printf(list_ioctx, "file %s\n", buf);
339 av_free(buf);
340 break;
341 }
342 default:
343 av_assert0(!"Invalid list type");
344 }
345 }
346
segment_end(AVFormatContext * s,int write_trailer,int is_last)347 static int segment_end(AVFormatContext *s, int write_trailer, int is_last)
348 {
349 SegmentContext *seg = s->priv_data;
350 AVFormatContext *oc = seg->avf;
351 int ret = 0;
352 AVTimecode tc;
353 AVRational rate;
354 AVDictionaryEntry *tcr;
355 char buf[AV_TIMECODE_STR_SIZE];
356 int i;
357 int err;
358
359 if (!oc || !oc->pb)
360 return AVERROR(EINVAL);
361
362 av_write_frame(oc, NULL); /* Flush any buffered data (fragmented mp4) */
363 if (write_trailer)
364 ret = av_write_trailer(oc);
365
366 if (ret < 0)
367 av_log(s, AV_LOG_ERROR, "Failure occurred when ending segment '%s'\n",
368 oc->url);
369
370 if (seg->list) {
371 if (seg->list_size || seg->list_type == LIST_TYPE_M3U8) {
372 SegmentListEntry *entry = av_mallocz(sizeof(*entry));
373 if (!entry) {
374 ret = AVERROR(ENOMEM);
375 goto end;
376 }
377
378 /* append new element */
379 memcpy(entry, &seg->cur_entry, sizeof(*entry));
380 entry->filename = av_strdup(entry->filename);
381 if (!seg->segment_list_entries)
382 seg->segment_list_entries = seg->segment_list_entries_end = entry;
383 else
384 seg->segment_list_entries_end->next = entry;
385 seg->segment_list_entries_end = entry;
386
387 /* drop first item */
388 if (seg->list_size && seg->segment_count >= seg->list_size) {
389 entry = seg->segment_list_entries;
390 seg->segment_list_entries = seg->segment_list_entries->next;
391 av_freep(&entry->filename);
392 av_freep(&entry);
393 }
394
395 if ((ret = segment_list_open(s)) < 0)
396 goto end;
397 for (entry = seg->segment_list_entries; entry; entry = entry->next)
398 segment_list_print_entry(seg->list_pb, seg->list_type, entry, s);
399 if (seg->list_type == LIST_TYPE_M3U8 && is_last)
400 avio_printf(seg->list_pb, "#EXT-X-ENDLIST\n");
401 ff_format_io_close(s, &seg->list_pb);
402 if (seg->use_rename)
403 ff_rename(seg->temp_list_filename, seg->list, s);
404 } else {
405 segment_list_print_entry(seg->list_pb, seg->list_type, &seg->cur_entry, s);
406 avio_flush(seg->list_pb);
407 }
408 }
409
410 av_log(s, AV_LOG_VERBOSE, "segment:'%s' count:%d ended\n",
411 seg->avf->url, seg->segment_count);
412 seg->segment_count++;
413
414 if (seg->increment_tc) {
415 tcr = av_dict_get(s->metadata, "timecode", NULL, 0);
416 if (tcr) {
417 /* search the first video stream */
418 for (i = 0; i < s->nb_streams; i++) {
419 if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
420 rate = s->streams[i]->avg_frame_rate;/* Get fps from the video stream */
421 err = av_timecode_init_from_string(&tc, rate, tcr->value, s);
422 if (err < 0) {
423 av_log(s, AV_LOG_WARNING, "Could not increment global timecode, error occurred during timecode creation.\n");
424 break;
425 }
426 tc.start += (int)((seg->cur_entry.end_time - seg->cur_entry.start_time) * av_q2d(rate));/* increment timecode */
427 av_dict_set(&s->metadata, "timecode",
428 av_timecode_make_string(&tc, buf, 0), 0);
429 break;
430 }
431 }
432 } else {
433 av_log(s, AV_LOG_WARNING, "Could not increment global timecode, no global timecode metadata found.\n");
434 }
435 for (i = 0; i < s->nb_streams; i++) {
436 if (s->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
437 char st_buf[AV_TIMECODE_STR_SIZE];
438 AVTimecode st_tc;
439 AVRational st_rate = s->streams[i]->avg_frame_rate;
440 AVDictionaryEntry *st_tcr = av_dict_get(s->streams[i]->metadata, "timecode", NULL, 0);
441 if (st_tcr) {
442 if ((av_timecode_init_from_string(&st_tc, st_rate, st_tcr->value, s) < 0)) {
443 av_log(s, AV_LOG_WARNING, "Could not increment stream %d timecode, error occurred during timecode creation.\n", i);
444 continue;
445 }
446 st_tc.start += (int)((seg->cur_entry.end_time - seg->cur_entry.start_time) * av_q2d(st_rate)); // increment timecode
447 av_dict_set(&s->streams[i]->metadata, "timecode", av_timecode_make_string(&st_tc, st_buf, 0), 0);
448 }
449 }
450 }
451 }
452
453 end:
454 ff_format_io_close(oc, &oc->pb);
455
456 return ret;
457 }
458
parse_times(void * log_ctx,int64_t ** times,int * nb_times,const char * times_str)459 static int parse_times(void *log_ctx, int64_t **times, int *nb_times,
460 const char *times_str)
461 {
462 char *p;
463 int i, ret = 0;
464 char *times_str1 = av_strdup(times_str);
465 char *saveptr = NULL;
466
467 if (!times_str1)
468 return AVERROR(ENOMEM);
469
470 #define FAIL(err) ret = err; goto end
471
472 *nb_times = 1;
473 for (p = times_str1; *p; p++)
474 if (*p == ',')
475 (*nb_times)++;
476
477 *times = av_malloc_array(*nb_times, sizeof(**times));
478 if (!*times) {
479 av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced times array\n");
480 FAIL(AVERROR(ENOMEM));
481 }
482
483 p = times_str1;
484 for (i = 0; i < *nb_times; i++) {
485 int64_t t;
486 char *tstr = av_strtok(p, ",", &saveptr);
487 p = NULL;
488
489 if (!tstr || !tstr[0]) {
490 av_log(log_ctx, AV_LOG_ERROR, "Empty time specification in times list %s\n",
491 times_str);
492 FAIL(AVERROR(EINVAL));
493 }
494
495 ret = av_parse_time(&t, tstr, 1);
496 if (ret < 0) {
497 av_log(log_ctx, AV_LOG_ERROR,
498 "Invalid time duration specification '%s' in times list %s\n", tstr, times_str);
499 FAIL(AVERROR(EINVAL));
500 }
501 (*times)[i] = t;
502
503 /* check on monotonicity */
504 if (i && (*times)[i-1] > (*times)[i]) {
505 av_log(log_ctx, AV_LOG_ERROR,
506 "Specified time %f is smaller than the last time %f\n",
507 (float)((*times)[i])/1000000, (float)((*times)[i-1])/1000000);
508 FAIL(AVERROR(EINVAL));
509 }
510 }
511
512 end:
513 av_free(times_str1);
514 return ret;
515 }
516
parse_frames(void * log_ctx,int ** frames,int * nb_frames,const char * frames_str)517 static int parse_frames(void *log_ctx, int **frames, int *nb_frames,
518 const char *frames_str)
519 {
520 const char *p;
521 int i;
522
523 *nb_frames = 1;
524 for (p = frames_str; *p; p++)
525 if (*p == ',')
526 (*nb_frames)++;
527
528 *frames = av_malloc_array(*nb_frames, sizeof(**frames));
529 if (!*frames) {
530 av_log(log_ctx, AV_LOG_ERROR, "Could not allocate forced frames array\n");
531 return AVERROR(ENOMEM);
532 }
533
534 p = frames_str;
535 for (i = 0; i < *nb_frames; i++) {
536 long int f;
537 char *tailptr;
538
539 if (*p == '\0' || *p == ',') {
540 av_log(log_ctx, AV_LOG_ERROR, "Empty frame specification in frame list %s\n",
541 frames_str);
542 return AVERROR(EINVAL);
543 }
544 f = strtol(p, &tailptr, 10);
545 if (*tailptr != '\0' && *tailptr != ',' || f <= 0 || f >= INT_MAX) {
546 av_log(log_ctx, AV_LOG_ERROR,
547 "Invalid argument '%s', must be a positive integer < INT_MAX\n",
548 p);
549 return AVERROR(EINVAL);
550 }
551 if (*tailptr == ',')
552 tailptr++;
553 p = tailptr;
554 (*frames)[i] = f;
555
556 /* check on monotonicity */
557 if (i && (*frames)[i-1] > (*frames)[i]) {
558 av_log(log_ctx, AV_LOG_ERROR,
559 "Specified frame %d is smaller than the last frame %d\n",
560 (*frames)[i], (*frames)[i-1]);
561 return AVERROR(EINVAL);
562 }
563 }
564
565 return 0;
566 }
567
open_null_ctx(AVIOContext ** ctx)568 static int open_null_ctx(AVIOContext **ctx)
569 {
570 int buf_size = 32768;
571 uint8_t *buf = av_malloc(buf_size);
572 if (!buf)
573 return AVERROR(ENOMEM);
574 *ctx = avio_alloc_context(buf, buf_size, 1, NULL, NULL, NULL, NULL);
575 if (!*ctx) {
576 av_free(buf);
577 return AVERROR(ENOMEM);
578 }
579 return 0;
580 }
581
close_null_ctxp(AVIOContext ** pb)582 static void close_null_ctxp(AVIOContext **pb)
583 {
584 av_freep(&(*pb)->buffer);
585 avio_context_free(pb);
586 }
587
select_reference_stream(AVFormatContext * s)588 static int select_reference_stream(AVFormatContext *s)
589 {
590 SegmentContext *seg = s->priv_data;
591 int ret, i;
592
593 seg->reference_stream_index = -1;
594 if (!strcmp(seg->reference_stream_specifier, "auto")) {
595 /* select first index of type with highest priority */
596 int type_index_map[AVMEDIA_TYPE_NB];
597 static const enum AVMediaType type_priority_list[] = {
598 AVMEDIA_TYPE_VIDEO,
599 AVMEDIA_TYPE_AUDIO,
600 AVMEDIA_TYPE_SUBTITLE,
601 AVMEDIA_TYPE_DATA,
602 AVMEDIA_TYPE_ATTACHMENT,
603 #ifdef OHOS_AUXILIARY_TRACK
604 AVMEDIA_TYPE_AUXILIARY,
605 #endif
606 };
607 enum AVMediaType type;
608
609 for (i = 0; i < AVMEDIA_TYPE_NB; i++)
610 type_index_map[i] = -1;
611
612 /* select first index for each type */
613 for (i = 0; i < s->nb_streams; i++) {
614 type = s->streams[i]->codecpar->codec_type;
615 if ((unsigned)type < AVMEDIA_TYPE_NB && type_index_map[type] == -1
616 /* ignore attached pictures/cover art streams */
617 && !(s->streams[i]->disposition & AV_DISPOSITION_ATTACHED_PIC))
618 type_index_map[type] = i;
619 }
620
621 for (i = 0; i < FF_ARRAY_ELEMS(type_priority_list); i++) {
622 type = type_priority_list[i];
623 if ((seg->reference_stream_index = type_index_map[type]) >= 0)
624 break;
625 }
626 } else {
627 for (i = 0; i < s->nb_streams; i++) {
628 ret = avformat_match_stream_specifier(s, s->streams[i],
629 seg->reference_stream_specifier);
630 if (ret < 0)
631 return ret;
632 if (ret > 0) {
633 seg->reference_stream_index = i;
634 break;
635 }
636 }
637 }
638
639 if (seg->reference_stream_index < 0) {
640 av_log(s, AV_LOG_ERROR, "Could not select stream matching identifier '%s'\n",
641 seg->reference_stream_specifier);
642 return AVERROR(EINVAL);
643 }
644
645 return 0;
646 }
647
seg_free(AVFormatContext * s)648 static void seg_free(AVFormatContext *s)
649 {
650 SegmentContext *seg = s->priv_data;
651 SegmentListEntry *cur;
652
653 ff_format_io_close(s, &seg->list_pb);
654 if (seg->avf) {
655 if (seg->is_nullctx)
656 close_null_ctxp(&seg->avf->pb);
657 else
658 ff_format_io_close(s, &seg->avf->pb);
659 avformat_free_context(seg->avf);
660 seg->avf = NULL;
661 }
662 av_freep(&seg->times);
663 av_freep(&seg->frames);
664 av_freep(&seg->cur_entry.filename);
665
666 cur = seg->segment_list_entries;
667 while (cur) {
668 SegmentListEntry *next = cur->next;
669 av_freep(&cur->filename);
670 av_free(cur);
671 cur = next;
672 }
673 }
674
seg_init(AVFormatContext * s)675 static int seg_init(AVFormatContext *s)
676 {
677 SegmentContext *seg = s->priv_data;
678 AVFormatContext *oc = seg->avf;
679 AVDictionary *options = NULL;
680 int ret;
681 int i;
682
683 seg->segment_count = 0;
684 if (!seg->write_header_trailer)
685 seg->individual_header_trailer = 0;
686
687 if (seg->header_filename) {
688 seg->write_header_trailer = 1;
689 seg->individual_header_trailer = 0;
690 }
691
692 if (seg->initial_offset > 0) {
693 av_log(s, AV_LOG_WARNING, "NOTE: the option initial_offset is deprecated,"
694 "you can use output_ts_offset instead of it\n");
695 }
696
697 if ((seg->time != 2000000) + !!seg->times_str + !!seg->frames_str > 1) {
698 av_log(s, AV_LOG_ERROR,
699 "segment_time, segment_times, and segment_frames options "
700 "are mutually exclusive, select just one of them\n");
701 return AVERROR(EINVAL);
702 }
703
704 if (seg->times_str) {
705 if ((ret = parse_times(s, &seg->times, &seg->nb_times, seg->times_str)) < 0)
706 return ret;
707 } else if (seg->frames_str) {
708 if ((ret = parse_frames(s, &seg->frames, &seg->nb_frames, seg->frames_str)) < 0)
709 return ret;
710 } else {
711 if (seg->use_clocktime) {
712 if (seg->time <= 0) {
713 av_log(s, AV_LOG_ERROR, "Invalid negative segment_time with segment_atclocktime option set\n");
714 return AVERROR(EINVAL);
715 }
716 seg->clocktime_offset = seg->time - (seg->clocktime_offset % seg->time);
717 }
718 }
719
720 if (seg->list) {
721 if (seg->list_type == LIST_TYPE_UNDEFINED) {
722 if (av_match_ext(seg->list, "csv" )) seg->list_type = LIST_TYPE_CSV;
723 else if (av_match_ext(seg->list, "ext" )) seg->list_type = LIST_TYPE_EXT;
724 else if (av_match_ext(seg->list, "m3u8")) seg->list_type = LIST_TYPE_M3U8;
725 else if (av_match_ext(seg->list, "ffcat,ffconcat")) seg->list_type = LIST_TYPE_FFCONCAT;
726 else seg->list_type = LIST_TYPE_FLAT;
727 }
728 if (!seg->list_size && seg->list_type != LIST_TYPE_M3U8) {
729 if ((ret = segment_list_open(s)) < 0)
730 return ret;
731 } else {
732 const char *proto = avio_find_protocol_name(seg->list);
733 seg->use_rename = proto && !strcmp(proto, "file");
734 }
735 }
736
737 if (seg->list_type == LIST_TYPE_EXT)
738 av_log(s, AV_LOG_WARNING, "'ext' list type option is deprecated in favor of 'csv'\n");
739
740 if ((ret = select_reference_stream(s)) < 0)
741 return ret;
742 av_log(s, AV_LOG_VERBOSE, "Selected stream id:%d type:%s\n",
743 seg->reference_stream_index,
744 av_get_media_type_string(s->streams[seg->reference_stream_index]->codecpar->codec_type));
745
746 seg->oformat = av_guess_format(seg->format, s->url, NULL);
747
748 if (!seg->oformat)
749 return AVERROR_MUXER_NOT_FOUND;
750 if (seg->oformat->flags & AVFMT_NOFILE) {
751 av_log(s, AV_LOG_ERROR, "format %s not supported.\n",
752 seg->oformat->name);
753 return AVERROR(EINVAL);
754 }
755
756 if ((ret = segment_mux_init(s)) < 0)
757 return ret;
758
759 if ((ret = set_segment_filename(s)) < 0)
760 return ret;
761 oc = seg->avf;
762
763 if (seg->write_header_trailer) {
764 if ((ret = s->io_open(s, &oc->pb,
765 seg->header_filename ? seg->header_filename : oc->url,
766 AVIO_FLAG_WRITE, NULL)) < 0) {
767 av_log(s, AV_LOG_ERROR, "Failed to open segment '%s'\n", oc->url);
768 return ret;
769 }
770 if (!seg->individual_header_trailer)
771 oc->pb->seekable = 0;
772 } else {
773 if ((ret = open_null_ctx(&oc->pb)) < 0)
774 return ret;
775 seg->is_nullctx = 1;
776 }
777
778 av_dict_copy(&options, seg->format_options, 0);
779 av_dict_set(&options, "fflags", "-autobsf", 0);
780 ret = avformat_init_output(oc, &options);
781 if (av_dict_count(options)) {
782 av_log(s, AV_LOG_ERROR,
783 "Some of the provided format options are not recognized\n");
784 av_dict_free(&options);
785 return AVERROR(EINVAL);
786 }
787 av_dict_free(&options);
788
789 if (ret < 0) {
790 return ret;
791 }
792 seg->segment_frame_count = 0;
793
794 av_assert0(s->nb_streams == oc->nb_streams);
795 if (ret == AVSTREAM_INIT_IN_WRITE_HEADER) {
796 ret = avformat_write_header(oc, NULL);
797 if (ret < 0)
798 return ret;
799 seg->header_written = 1;
800 }
801
802 for (i = 0; i < s->nb_streams; i++) {
803 AVStream *inner_st = oc->streams[i];
804 AVStream *outer_st = s->streams[i];
805 avpriv_set_pts_info(outer_st, inner_st->pts_wrap_bits, inner_st->time_base.num, inner_st->time_base.den);
806 }
807
808 if (oc->avoid_negative_ts > 0 && s->avoid_negative_ts < 0)
809 s->avoid_negative_ts = 1;
810
811 return ret;
812 }
813
seg_write_header(AVFormatContext * s)814 static int seg_write_header(AVFormatContext *s)
815 {
816 SegmentContext *seg = s->priv_data;
817 AVFormatContext *oc = seg->avf;
818 int ret;
819
820 if (!seg->header_written) {
821 ret = avformat_write_header(oc, NULL);
822 if (ret < 0)
823 return ret;
824 }
825
826 if (!seg->write_header_trailer || seg->header_filename) {
827 if (seg->header_filename) {
828 av_write_frame(oc, NULL);
829 ff_format_io_close(oc, &oc->pb);
830 } else {
831 close_null_ctxp(&oc->pb);
832 seg->is_nullctx = 0;
833 }
834 if ((ret = oc->io_open(oc, &oc->pb, oc->url, AVIO_FLAG_WRITE, NULL)) < 0)
835 return ret;
836 if (!seg->individual_header_trailer)
837 oc->pb->seekable = 0;
838 }
839
840 return 0;
841 }
842
seg_write_packet(AVFormatContext * s,AVPacket * pkt)843 static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
844 {
845 SegmentContext *seg = s->priv_data;
846 AVStream *st = s->streams[pkt->stream_index];
847 int64_t end_pts = INT64_MAX, offset;
848 int start_frame = INT_MAX;
849 int ret;
850 struct tm ti;
851 int64_t usecs;
852 int64_t wrapped_val;
853
854 if (!seg->avf || !seg->avf->pb)
855 return AVERROR(EINVAL);
856
857 if (!st->codecpar->extradata_size) {
858 size_t pkt_extradata_size;
859 uint8_t *pkt_extradata = av_packet_get_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, &pkt_extradata_size);
860 if (pkt_extradata && pkt_extradata_size > 0) {
861 ret = ff_alloc_extradata(st->codecpar, pkt_extradata_size);
862 if (ret < 0) {
863 av_log(s, AV_LOG_WARNING, "Unable to add extradata to stream. Output segments may be invalid.\n");
864 goto calc_times;
865 }
866 memcpy(st->codecpar->extradata, pkt_extradata, pkt_extradata_size);
867 }
868 }
869
870 calc_times:
871 if (seg->times) {
872 end_pts = seg->segment_count < seg->nb_times ?
873 seg->times[seg->segment_count] : INT64_MAX;
874 } else if (seg->frames) {
875 start_frame = seg->segment_count < seg->nb_frames ?
876 seg->frames[seg->segment_count] : INT_MAX;
877 } else {
878 if (seg->use_clocktime) {
879 int64_t avgt = av_gettime();
880 time_t sec = avgt / 1000000;
881 localtime_r(&sec, &ti);
882 usecs = (int64_t)(ti.tm_hour * 3600 + ti.tm_min * 60 + ti.tm_sec) * 1000000 + (avgt % 1000000);
883 wrapped_val = (usecs + seg->clocktime_offset) % seg->time;
884 if (wrapped_val < seg->last_val && wrapped_val < seg->clocktime_wrap_duration)
885 seg->cut_pending = 1;
886 seg->last_val = wrapped_val;
887 } else {
888 end_pts = seg->time * (seg->segment_count + 1);
889 }
890 }
891
892 ff_dlog(s, "packet stream:%d pts:%s pts_time:%s duration_time:%s is_key:%d frame:%d\n",
893 pkt->stream_index, av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
894 av_ts2timestr(pkt->duration, &st->time_base),
895 pkt->flags & AV_PKT_FLAG_KEY,
896 pkt->stream_index == seg->reference_stream_index ? seg->frame_count : -1);
897
898 if (pkt->stream_index == seg->reference_stream_index &&
899 (pkt->flags & AV_PKT_FLAG_KEY || seg->break_non_keyframes) &&
900 (seg->segment_frame_count > 0 || seg->write_empty) &&
901 (seg->cut_pending || seg->frame_count >= start_frame ||
902 (pkt->pts != AV_NOPTS_VALUE &&
903 av_compare_ts(pkt->pts, st->time_base,
904 end_pts - seg->time_delta, AV_TIME_BASE_Q) >= 0))) {
905 /* sanitize end time in case last packet didn't have a defined duration */
906 if (seg->cur_entry.last_duration == 0)
907 seg->cur_entry.end_time = (double)pkt->pts * av_q2d(st->time_base);
908
909 if ((ret = segment_end(s, seg->individual_header_trailer, 0)) < 0)
910 goto fail;
911
912 if ((ret = segment_start(s, seg->individual_header_trailer)) < 0)
913 goto fail;
914
915 seg->cut_pending = 0;
916 seg->cur_entry.index = seg->segment_idx + seg->segment_idx_wrap * seg->segment_idx_wrap_nb;
917 seg->cur_entry.start_time = (double)pkt->pts * av_q2d(st->time_base);
918 seg->cur_entry.start_pts = av_rescale_q(pkt->pts, st->time_base, AV_TIME_BASE_Q);
919 seg->cur_entry.end_time = seg->cur_entry.start_time;
920
921 if (seg->times || (!seg->frames && !seg->use_clocktime) && seg->write_empty)
922 goto calc_times;
923 }
924
925 if (pkt->stream_index == seg->reference_stream_index) {
926 if (pkt->pts != AV_NOPTS_VALUE)
927 seg->cur_entry.end_time =
928 FFMAX(seg->cur_entry.end_time, (double)(pkt->pts + pkt->duration) * av_q2d(st->time_base));
929 seg->cur_entry.last_duration = pkt->duration;
930 }
931
932 if (seg->segment_frame_count == 0) {
933 av_log(s, AV_LOG_VERBOSE, "segment:'%s' starts with packet stream:%d pts:%s pts_time:%s frame:%d\n",
934 seg->avf->url, pkt->stream_index,
935 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base), seg->frame_count);
936 }
937
938 av_log(s, AV_LOG_DEBUG, "stream:%d start_pts_time:%s pts:%s pts_time:%s dts:%s dts_time:%s",
939 pkt->stream_index,
940 av_ts2timestr(seg->cur_entry.start_pts, &AV_TIME_BASE_Q),
941 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
942 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
943
944 /* compute new timestamps */
945 offset = av_rescale_q(seg->initial_offset - (seg->reset_timestamps ? seg->cur_entry.start_pts : 0),
946 AV_TIME_BASE_Q, st->time_base);
947 if (pkt->pts != AV_NOPTS_VALUE)
948 pkt->pts += offset;
949 if (pkt->dts != AV_NOPTS_VALUE)
950 pkt->dts += offset;
951
952 av_log(s, AV_LOG_DEBUG, " -> pts:%s pts_time:%s dts:%s dts_time:%s\n",
953 av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
954 av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
955
956 ret = ff_write_chained(seg->avf, pkt->stream_index, pkt, s,
957 seg->initial_offset || seg->reset_timestamps || seg->avf->oformat->interleave_packet);
958
959 fail:
960 /* Use st->index here as the packet returned from ff_write_chained()
961 * is blank if interleaving has been used. */
962 if (st->index == seg->reference_stream_index) {
963 seg->frame_count++;
964 seg->segment_frame_count++;
965 }
966
967 return ret;
968 }
969
seg_write_trailer(struct AVFormatContext * s)970 static int seg_write_trailer(struct AVFormatContext *s)
971 {
972 SegmentContext *seg = s->priv_data;
973 AVFormatContext *oc = seg->avf;
974 int ret;
975
976 if (!oc)
977 return 0;
978
979 if (!seg->write_header_trailer) {
980 if ((ret = segment_end(s, 0, 1)) < 0)
981 return ret;
982 if ((ret = open_null_ctx(&oc->pb)) < 0)
983 return ret;
984 seg->is_nullctx = 1;
985 ret = av_write_trailer(oc);
986 } else {
987 ret = segment_end(s, 1, 1);
988 }
989 return ret;
990 }
991
seg_check_bitstream(AVFormatContext * s,AVStream * st,const AVPacket * pkt)992 static int seg_check_bitstream(AVFormatContext *s, AVStream *st,
993 const AVPacket *pkt)
994 {
995 SegmentContext *seg = s->priv_data;
996 AVFormatContext *oc = seg->avf;
997 if (oc->oformat->check_bitstream) {
998 AVStream *const ost = oc->streams[st->index];
999 int ret = oc->oformat->check_bitstream(oc, ost, pkt);
1000 if (ret == 1) {
1001 FFStream *const sti = ffstream(st);
1002 FFStream *const osti = ffstream(ost);
1003 sti->bsfc = osti->bsfc;
1004 osti->bsfc = NULL;
1005 }
1006 return ret;
1007 }
1008 return 1;
1009 }
1010
1011 #define OFFSET(x) offsetof(SegmentContext, x)
1012 #define E AV_OPT_FLAG_ENCODING_PARAM
1013 static const AVOption options[] = {
1014 { "reference_stream", "set reference stream", OFFSET(reference_stream_specifier), AV_OPT_TYPE_STRING, {.str = "auto"}, 0, 0, E },
1015 { "segment_format", "set container format used for the segments", OFFSET(format), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1016 { "segment_format_options", "set list of options for the container format used for the segments", OFFSET(format_options), AV_OPT_TYPE_DICT, {.str = NULL}, 0, 0, E },
1017 { "segment_list", "set the segment list filename", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1018 { "segment_header_filename", "write a single file containing the header", OFFSET(header_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1019
1020 { "segment_list_flags","set flags affecting segment list generation", OFFSET(list_flags), AV_OPT_TYPE_FLAGS, {.i64 = SEGMENT_LIST_FLAG_CACHE }, 0, UINT_MAX, E, "list_flags"},
1021 { "cache", "allow list caching", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_CACHE }, INT_MIN, INT_MAX, E, "list_flags"},
1022 { "live", "enable live-friendly list generation (useful for HLS)", 0, AV_OPT_TYPE_CONST, {.i64 = SEGMENT_LIST_FLAG_LIVE }, INT_MIN, INT_MAX, E, "list_flags"},
1023
1024 { "segment_list_size", "set the maximum number of playlist entries", OFFSET(list_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1025
1026 { "segment_list_type", "set the segment list type", OFFSET(list_type), AV_OPT_TYPE_INT, {.i64 = LIST_TYPE_UNDEFINED}, -1, LIST_TYPE_NB-1, E, "list_type" },
1027 { "flat", "flat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FLAT }, INT_MIN, INT_MAX, E, "list_type" },
1028 { "csv", "csv format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_CSV }, INT_MIN, INT_MAX, E, "list_type" },
1029 { "ext", "extended format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_EXT }, INT_MIN, INT_MAX, E, "list_type" },
1030 { "ffconcat", "ffconcat format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_FFCONCAT }, INT_MIN, INT_MAX, E, "list_type" },
1031 { "m3u8", "M3U8 format", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
1032 { "hls", "Apple HTTP Live Streaming compatible", 0, AV_OPT_TYPE_CONST, {.i64=LIST_TYPE_M3U8 }, INT_MIN, INT_MAX, E, "list_type" },
1033
1034 { "segment_atclocktime", "set segment to be cut at clocktime", OFFSET(use_clocktime), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E},
1035 { "segment_clocktime_offset", "set segment clocktime offset", OFFSET(clocktime_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, 86400000000LL, E},
1036 { "segment_clocktime_wrap_duration", "set segment clocktime wrapping duration", OFFSET(clocktime_wrap_duration), AV_OPT_TYPE_DURATION, {.i64 = INT64_MAX}, 0, INT64_MAX, E},
1037 { "segment_time", "set segment duration", OFFSET(time),AV_OPT_TYPE_DURATION, {.i64 = 2000000}, INT64_MIN, INT64_MAX, E },
1038 { "segment_time_delta","set approximation value used for the segment times", OFFSET(time_delta), AV_OPT_TYPE_DURATION, {.i64 = 0}, 0, INT64_MAX, E },
1039 { "segment_times", "set segment split time points", OFFSET(times_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
1040 { "segment_frames", "set segment split frame numbers", OFFSET(frames_str),AV_OPT_TYPE_STRING,{.str = NULL}, 0, 0, E },
1041 { "segment_wrap", "set number after which the index wraps", OFFSET(segment_idx_wrap), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1042 { "segment_list_entry_prefix", "set base url prefix for segments", OFFSET(entry_prefix), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
1043 { "segment_start_number", "set the sequence number of the first segment", OFFSET(segment_idx), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1044 { "segment_wrap_number", "set the number of wrap before the first segment", OFFSET(segment_idx_wrap_nb), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, E },
1045 { "strftime", "set filename expansion with strftime at segment creation", OFFSET(use_strftime), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1046 { "increment_tc", "increment timecode between each segment", OFFSET(increment_tc), AV_OPT_TYPE_BOOL, {.i64 = 0 }, 0, 1, E },
1047 { "break_non_keyframes", "allow breaking segments on non-keyframes", OFFSET(break_non_keyframes), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1048
1049 { "individual_header_trailer", "write header/trailer to each segment", OFFSET(individual_header_trailer), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, E },
1050 { "write_header_trailer", "write a header to the first segment and a trailer to the last one", OFFSET(write_header_trailer), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, E },
1051 { "reset_timestamps", "reset timestamps at the beginning of each segment", OFFSET(reset_timestamps), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1052 { "initial_offset", "set initial timestamp offset", OFFSET(initial_offset), AV_OPT_TYPE_DURATION, {.i64 = 0}, -INT64_MAX, INT64_MAX, E },
1053 { "write_empty_segments", "allow writing empty 'filler' segments", OFFSET(write_empty), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, E },
1054 { NULL },
1055 };
1056
1057 static const AVClass seg_class = {
1058 .class_name = "(stream) segment muxer",
1059 .item_name = av_default_item_name,
1060 .option = options,
1061 .version = LIBAVUTIL_VERSION_INT,
1062 };
1063
1064 #if CONFIG_SEGMENT_MUXER
1065 const AVOutputFormat ff_segment_muxer = {
1066 .name = "segment",
1067 .long_name = NULL_IF_CONFIG_SMALL("segment"),
1068 .priv_data_size = sizeof(SegmentContext),
1069 .flags = AVFMT_NOFILE|AVFMT_GLOBALHEADER,
1070 .init = seg_init,
1071 .write_header = seg_write_header,
1072 .write_packet = seg_write_packet,
1073 .write_trailer = seg_write_trailer,
1074 .deinit = seg_free,
1075 .check_bitstream = seg_check_bitstream,
1076 .priv_class = &seg_class,
1077 };
1078 #endif
1079
1080 #if CONFIG_STREAM_SEGMENT_MUXER
1081 const AVOutputFormat ff_stream_segment_muxer = {
1082 .name = "stream_segment,ssegment",
1083 .long_name = NULL_IF_CONFIG_SMALL("streaming segment muxer"),
1084 .priv_data_size = sizeof(SegmentContext),
1085 .flags = AVFMT_NOFILE,
1086 .init = seg_init,
1087 .write_header = seg_write_header,
1088 .write_packet = seg_write_packet,
1089 .write_trailer = seg_write_trailer,
1090 .deinit = seg_free,
1091 .check_bitstream = seg_check_bitstream,
1092 .priv_class = &seg_class,
1093 };
1094 #endif
1095