1 /*
2 * Dynamic Adaptive Streaming over HTTP demux
3 * Copyright (c) 2017 samsamsam@o2.pl based on HLS demux
4 * Copyright (c) 2017 Steven Liu
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 #include <libxml/parser.h>
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/opt.h"
25 #include "libavutil/time.h"
26 #include "libavutil/parseutils.h"
27 #include "internal.h"
28 #include "avio_internal.h"
29 #include "dash.h"
30
31 #define INITIAL_BUFFER_SIZE 32768
32 #define MAX_MANIFEST_SIZE 50 * 1024
33 #define DEFAULT_MANIFEST_SIZE 8 * 1024
34
35 struct fragment {
36 int64_t url_offset;
37 int64_t size;
38 char *url;
39 };
40
41 /*
42 * reference to : ISO_IEC_23009-1-DASH-2012
43 * Section: 5.3.9.6.2
44 * Table: Table 17 — Semantics of SegmentTimeline element
45 * */
46 struct timeline {
47 /* starttime: Element or Attribute Name
48 * specifies the MPD start time, in @timescale units,
49 * the first Segment in the series starts relative to the beginning of the Period.
50 * The value of this attribute must be equal to or greater than the sum of the previous S
51 * element earliest presentation time and the sum of the contiguous Segment durations.
52 * If the value of the attribute is greater than what is expressed by the previous S element,
53 * it expresses discontinuities in the timeline.
54 * If not present then the value shall be assumed to be zero for the first S element
55 * and for the subsequent S elements, the value shall be assumed to be the sum of
56 * the previous S element's earliest presentation time and contiguous duration
57 * (i.e. previous S@starttime + @duration * (@repeat + 1)).
58 * */
59 int64_t starttime;
60 /* repeat: Element or Attribute Name
61 * specifies the repeat count of the number of following contiguous Segments with
62 * the same duration expressed by the value of @duration. This value is zero-based
63 * (e.g. a value of three means four Segments in the contiguous series).
64 * */
65 int64_t repeat;
66 /* duration: Element or Attribute Name
67 * specifies the Segment duration, in units of the value of the @timescale.
68 * */
69 int64_t duration;
70 };
71
72 /*
73 * Each playlist has its own demuxer. If it is currently active,
74 * it has an opened AVIOContext too, and potentially an AVPacket
75 * containing the next packet from this stream.
76 */
77 struct representation {
78 char *url_template;
79 AVIOContext pb;
80 AVIOContext *input;
81 AVFormatContext *parent;
82 AVFormatContext *ctx;
83 AVPacket pkt;
84 int rep_idx;
85 int rep_count;
86 int stream_index;
87
88 enum AVMediaType type;
89 char id[20];
90 char *lang;
91 int bandwidth;
92 AVRational framerate;
93 AVStream *assoc_stream; /* demuxer stream associated with this representation */
94
95 int n_fragments;
96 struct fragment **fragments; /* VOD list of fragment for profile */
97
98 int n_timelines;
99 struct timeline **timelines;
100
101 int64_t first_seq_no;
102 int64_t last_seq_no;
103 int64_t start_number; /* used in case when we have dynamic list of segment to know which segments are new one*/
104
105 int64_t fragment_duration;
106 int64_t fragment_timescale;
107
108 int64_t presentation_timeoffset;
109
110 int64_t cur_seq_no;
111 int64_t cur_seg_offset;
112 int64_t cur_seg_size;
113 struct fragment *cur_seg;
114
115 /* Currently active Media Initialization Section */
116 struct fragment *init_section;
117 uint8_t *init_sec_buf;
118 uint32_t init_sec_buf_size;
119 uint32_t init_sec_data_len;
120 uint32_t init_sec_buf_read_offset;
121 int64_t cur_timestamp;
122 int is_restart_needed;
123 };
124
125 typedef struct DASHContext {
126 const AVClass *class;
127 char *base_url;
128
129 int n_videos;
130 struct representation **videos;
131 int n_audios;
132 struct representation **audios;
133 int n_subtitles;
134 struct representation **subtitles;
135
136 /* MediaPresentationDescription Attribute */
137 uint64_t media_presentation_duration;
138 uint64_t suggested_presentation_delay;
139 uint64_t availability_start_time;
140 uint64_t availability_end_time;
141 uint64_t publish_time;
142 uint64_t minimum_update_period;
143 uint64_t time_shift_buffer_depth;
144 uint64_t min_buffer_time;
145
146 /* Period Attribute */
147 uint64_t period_duration;
148 uint64_t period_start;
149
150 /* AdaptationSet Attribute */
151 char *adaptionset_lang;
152
153 int is_live;
154 AVIOInterruptCB *interrupt_callback;
155 char *allowed_extensions;
156 AVDictionary *avio_opts;
157 int max_url_size;
158
159 /* Flags for init section*/
160 int is_init_section_common_video;
161 int is_init_section_common_audio;
162
163 } DASHContext;
164
ishttp(char * url)165 static int ishttp(char *url)
166 {
167 const char *proto_name = avio_find_protocol_name(url);
168 return av_strstart(proto_name, "http", NULL);
169 }
170
aligned(int val)171 static int aligned(int val)
172 {
173 return ((val + 0x3F) >> 6) << 6;
174 }
175
get_current_time_in_sec(void)176 static uint64_t get_current_time_in_sec(void)
177 {
178 return av_gettime() / 1000000;
179 }
180
get_utc_date_time_insec(AVFormatContext * s,const char * datetime)181 static uint64_t get_utc_date_time_insec(AVFormatContext *s, const char *datetime)
182 {
183 struct tm timeinfo;
184 int year = 0;
185 int month = 0;
186 int day = 0;
187 int hour = 0;
188 int minute = 0;
189 int ret = 0;
190 float second = 0.0;
191
192 /* ISO-8601 date parser */
193 if (!datetime)
194 return 0;
195
196 ret = sscanf(datetime, "%d-%d-%dT%d:%d:%fZ", &year, &month, &day, &hour, &minute, &second);
197 /* year, month, day, hour, minute, second 6 arguments */
198 if (ret != 6) {
199 av_log(s, AV_LOG_WARNING, "get_utc_date_time_insec get a wrong time format\n");
200 }
201 timeinfo.tm_year = year - 1900;
202 timeinfo.tm_mon = month - 1;
203 timeinfo.tm_mday = day;
204 timeinfo.tm_hour = hour;
205 timeinfo.tm_min = minute;
206 timeinfo.tm_sec = (int)second;
207
208 return av_timegm(&timeinfo);
209 }
210
get_duration_insec(AVFormatContext * s,const char * duration)211 static uint32_t get_duration_insec(AVFormatContext *s, const char *duration)
212 {
213 /* ISO-8601 duration parser */
214 uint32_t days = 0;
215 uint32_t hours = 0;
216 uint32_t mins = 0;
217 uint32_t secs = 0;
218 int size = 0;
219 float value = 0;
220 char type = '\0';
221 const char *ptr = duration;
222
223 while (*ptr) {
224 if (*ptr == 'P' || *ptr == 'T') {
225 ptr++;
226 continue;
227 }
228
229 if (sscanf(ptr, "%f%c%n", &value, &type, &size) != 2) {
230 av_log(s, AV_LOG_WARNING, "get_duration_insec get a wrong time format\n");
231 return 0; /* parser error */
232 }
233 switch (type) {
234 case 'D':
235 days = (uint32_t)value;
236 break;
237 case 'H':
238 hours = (uint32_t)value;
239 break;
240 case 'M':
241 mins = (uint32_t)value;
242 break;
243 case 'S':
244 secs = (uint32_t)value;
245 break;
246 default:
247 // handle invalid type
248 break;
249 }
250 ptr += size;
251 }
252 return ((days * 24 + hours) * 60 + mins) * 60 + secs;
253 }
254
get_segment_start_time_based_on_timeline(struct representation * pls,int64_t cur_seq_no)255 static int64_t get_segment_start_time_based_on_timeline(struct representation *pls, int64_t cur_seq_no)
256 {
257 int64_t start_time = 0;
258 int64_t i = 0;
259 int64_t j = 0;
260 int64_t num = 0;
261
262 if (pls->n_timelines) {
263 for (i = 0; i < pls->n_timelines; i++) {
264 if (pls->timelines[i]->starttime > 0) {
265 start_time = pls->timelines[i]->starttime;
266 }
267 if (num == cur_seq_no)
268 goto finish;
269
270 start_time += pls->timelines[i]->duration;
271
272 if (pls->timelines[i]->repeat == -1) {
273 start_time = pls->timelines[i]->duration * cur_seq_no;
274 goto finish;
275 }
276
277 for (j = 0; j < pls->timelines[i]->repeat; j++) {
278 num++;
279 if (num == cur_seq_no)
280 goto finish;
281 start_time += pls->timelines[i]->duration;
282 }
283 num++;
284 }
285 }
286 finish:
287 return start_time;
288 }
289
calc_next_seg_no_from_timelines(struct representation * pls,int64_t cur_time)290 static int64_t calc_next_seg_no_from_timelines(struct representation *pls, int64_t cur_time)
291 {
292 int64_t i = 0;
293 int64_t j = 0;
294 int64_t num = 0;
295 int64_t start_time = 0;
296
297 for (i = 0; i < pls->n_timelines; i++) {
298 if (pls->timelines[i]->starttime > 0) {
299 start_time = pls->timelines[i]->starttime;
300 }
301 if (start_time > cur_time)
302 goto finish;
303
304 start_time += pls->timelines[i]->duration;
305 for (j = 0; j < pls->timelines[i]->repeat; j++) {
306 num++;
307 if (start_time > cur_time)
308 goto finish;
309 start_time += pls->timelines[i]->duration;
310 }
311 num++;
312 }
313
314 return -1;
315
316 finish:
317 return num;
318 }
319
free_fragment(struct fragment ** seg)320 static void free_fragment(struct fragment **seg)
321 {
322 if (!(*seg)) {
323 return;
324 }
325 av_freep(&(*seg)->url);
326 av_freep(seg);
327 }
328
free_fragment_list(struct representation * pls)329 static void free_fragment_list(struct representation *pls)
330 {
331 int i;
332
333 for (i = 0; i < pls->n_fragments; i++) {
334 free_fragment(&pls->fragments[i]);
335 }
336 av_freep(&pls->fragments);
337 pls->n_fragments = 0;
338 }
339
free_timelines_list(struct representation * pls)340 static void free_timelines_list(struct representation *pls)
341 {
342 int i;
343
344 for (i = 0; i < pls->n_timelines; i++) {
345 av_freep(&pls->timelines[i]);
346 }
347 av_freep(&pls->timelines);
348 pls->n_timelines = 0;
349 }
350
free_representation(struct representation * pls)351 static void free_representation(struct representation *pls)
352 {
353 free_fragment_list(pls);
354 free_timelines_list(pls);
355 free_fragment(&pls->cur_seg);
356 free_fragment(&pls->init_section);
357 av_freep(&pls->init_sec_buf);
358 av_freep(&pls->pb.buffer);
359 ff_format_io_close(pls->parent, &pls->input);
360 if (pls->ctx) {
361 pls->ctx->pb = NULL;
362 avformat_close_input(&pls->ctx);
363 }
364
365 av_freep(&pls->url_template);
366 av_freep(&pls);
367 }
368
free_video_list(DASHContext * c)369 static void free_video_list(DASHContext *c)
370 {
371 int i;
372 for (i = 0; i < c->n_videos; i++) {
373 struct representation *pls = c->videos[i];
374 free_representation(pls);
375 }
376 av_freep(&c->videos);
377 c->n_videos = 0;
378 }
379
free_audio_list(DASHContext * c)380 static void free_audio_list(DASHContext *c)
381 {
382 int i;
383 for (i = 0; i < c->n_audios; i++) {
384 struct representation *pls = c->audios[i];
385 free_representation(pls);
386 }
387 av_freep(&c->audios);
388 c->n_audios = 0;
389 }
390
free_subtitle_list(DASHContext * c)391 static void free_subtitle_list(DASHContext *c)
392 {
393 int i;
394 for (i = 0; i < c->n_subtitles; i++) {
395 struct representation *pls = c->subtitles[i];
396 free_representation(pls);
397 }
398 av_freep(&c->subtitles);
399 c->n_subtitles = 0;
400 }
401
open_url(AVFormatContext * s,AVIOContext ** pb,const char * url,AVDictionary * opts,AVDictionary * opts2,int * is_http)402 static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
403 AVDictionary *opts, AVDictionary *opts2, int *is_http)
404 {
405 DASHContext *c = s->priv_data;
406 AVDictionary *tmp = NULL;
407 const char *proto_name = NULL;
408 int ret;
409
410 av_dict_copy(&tmp, opts, 0);
411 av_dict_copy(&tmp, opts2, 0);
412
413 if (av_strstart(url, "crypto", NULL)) {
414 if (url[6] == '+' || url[6] == ':')
415 proto_name = avio_find_protocol_name(url + 7);
416 }
417
418 if (!proto_name)
419 proto_name = avio_find_protocol_name(url);
420
421 if (!proto_name)
422 return AVERROR_INVALIDDATA;
423
424 // only http(s) & file are allowed
425 if (av_strstart(proto_name, "file", NULL)) {
426 if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
427 av_log(s, AV_LOG_ERROR,
428 "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
429 "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
430 url);
431 return AVERROR_INVALIDDATA;
432 }
433 } else if (av_strstart(proto_name, "http", NULL)) {
434 ;
435 } else
436 return AVERROR_INVALIDDATA;
437
438 if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
439 ;
440 else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
441 ;
442 else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
443 return AVERROR_INVALIDDATA;
444
445 av_freep(pb);
446 ret = avio_open2(pb, url, AVIO_FLAG_READ, c->interrupt_callback, &tmp);
447 if (ret >= 0) {
448 // update cookies on http response with setcookies.
449 char *new_cookies = NULL;
450
451 if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
452 av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);
453
454 if (new_cookies) {
455 av_dict_set(&opts, "cookies", new_cookies, AV_DICT_DONT_STRDUP_VAL);
456 }
457
458 }
459
460 av_dict_free(&tmp);
461
462 if (is_http)
463 *is_http = av_strstart(proto_name, "http", NULL);
464
465 return ret;
466 }
467
get_content_url(xmlNodePtr * baseurl_nodes,int n_baseurl_nodes,int max_url_size,char * rep_id_val,char * rep_bandwidth_val,char * val)468 static char *get_content_url(xmlNodePtr *baseurl_nodes,
469 int n_baseurl_nodes,
470 int max_url_size,
471 char *rep_id_val,
472 char *rep_bandwidth_val,
473 char *val)
474 {
475 int i;
476 char *text;
477 char *url = NULL;
478 char *tmp_str = av_mallocz(max_url_size);
479 char *tmp_str_2 = av_mallocz(max_url_size);
480
481 if (!tmp_str || !tmp_str_2) {
482 return NULL;
483 }
484
485 for (i = 0; i < n_baseurl_nodes; ++i) {
486 if (baseurl_nodes[i] &&
487 baseurl_nodes[i]->children &&
488 baseurl_nodes[i]->children->type == XML_TEXT_NODE) {
489 text = xmlNodeGetContent(baseurl_nodes[i]->children);
490 if (text) {
491 memset(tmp_str, 0, max_url_size);
492 memset(tmp_str_2, 0, max_url_size);
493 ff_make_absolute_url(tmp_str_2, max_url_size, tmp_str, text);
494 av_strlcpy(tmp_str, tmp_str_2, max_url_size);
495 xmlFree(text);
496 }
497 }
498 }
499
500 if (val)
501 ff_make_absolute_url(tmp_str, max_url_size, tmp_str, val);
502
503 if (rep_id_val) {
504 url = av_strireplace(tmp_str, "$RepresentationID$", (const char*)rep_id_val);
505 if (!url) {
506 goto end;
507 }
508 av_strlcpy(tmp_str, url, max_url_size);
509 }
510 if (rep_bandwidth_val && tmp_str[0] != '\0') {
511 // free any previously assigned url before reassigning
512 av_free(url);
513 url = av_strireplace(tmp_str, "$Bandwidth$", (const char*)rep_bandwidth_val);
514 if (!url) {
515 goto end;
516 }
517 }
518 end:
519 av_free(tmp_str);
520 av_free(tmp_str_2);
521 return url;
522 }
523
get_val_from_nodes_tab(xmlNodePtr * nodes,const int n_nodes,const char * attrname)524 static char *get_val_from_nodes_tab(xmlNodePtr *nodes, const int n_nodes, const char *attrname)
525 {
526 int i;
527 char *val;
528
529 for (i = 0; i < n_nodes; ++i) {
530 if (nodes[i]) {
531 val = xmlGetProp(nodes[i], attrname);
532 if (val)
533 return val;
534 }
535 }
536
537 return NULL;
538 }
539
find_child_node_by_name(xmlNodePtr rootnode,const char * nodename)540 static xmlNodePtr find_child_node_by_name(xmlNodePtr rootnode, const char *nodename)
541 {
542 xmlNodePtr node = rootnode;
543 if (!node) {
544 return NULL;
545 }
546
547 node = xmlFirstElementChild(node);
548 while (node) {
549 if (!av_strcasecmp(node->name, nodename)) {
550 return node;
551 }
552 node = xmlNextElementSibling(node);
553 }
554 return NULL;
555 }
556
get_content_type(xmlNodePtr node)557 static enum AVMediaType get_content_type(xmlNodePtr node)
558 {
559 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
560 int i = 0;
561 const char *attr;
562 char *val = NULL;
563
564 if (node) {
565 for (i = 0; i < 2; i++) {
566 attr = i ? "mimeType" : "contentType";
567 val = xmlGetProp(node, attr);
568 if (val) {
569 if (av_stristr((const char *)val, "video")) {
570 type = AVMEDIA_TYPE_VIDEO;
571 } else if (av_stristr((const char *)val, "audio")) {
572 type = AVMEDIA_TYPE_AUDIO;
573 } else if (av_stristr((const char *)val, "text")) {
574 type = AVMEDIA_TYPE_SUBTITLE;
575 }
576 xmlFree(val);
577 }
578 }
579 }
580 return type;
581 }
582
get_Fragment(char * range)583 static struct fragment * get_Fragment(char *range)
584 {
585 struct fragment * seg = av_mallocz(sizeof(struct fragment));
586
587 if (!seg)
588 return NULL;
589
590 seg->size = -1;
591 if (range) {
592 char *str_end_offset;
593 char *str_offset = av_strtok(range, "-", &str_end_offset);
594 seg->url_offset = strtoll(str_offset, NULL, 10);
595 seg->size = strtoll(str_end_offset, NULL, 10) - seg->url_offset + 1;
596 }
597
598 return seg;
599 }
600
parse_manifest_segmenturlnode(AVFormatContext * s,struct representation * rep,xmlNodePtr fragmenturl_node,xmlNodePtr * baseurl_nodes,char * rep_id_val,char * rep_bandwidth_val)601 static int parse_manifest_segmenturlnode(AVFormatContext *s, struct representation *rep,
602 xmlNodePtr fragmenturl_node,
603 xmlNodePtr *baseurl_nodes,
604 char *rep_id_val,
605 char *rep_bandwidth_val)
606 {
607 DASHContext *c = s->priv_data;
608 char *initialization_val = NULL;
609 char *media_val = NULL;
610 char *range_val = NULL;
611 int max_url_size = c ? c->max_url_size: MAX_URL_SIZE;
612
613 if (!av_strcasecmp(fragmenturl_node->name, (const char *)"Initialization")) {
614 initialization_val = xmlGetProp(fragmenturl_node, "sourceURL");
615 range_val = xmlGetProp(fragmenturl_node, "range");
616 if (initialization_val || range_val) {
617 rep->init_section = get_Fragment(range_val);
618 if (!rep->init_section) {
619 xmlFree(initialization_val);
620 xmlFree(range_val);
621 return AVERROR(ENOMEM);
622 }
623 rep->init_section->url = get_content_url(baseurl_nodes, 4,
624 max_url_size,
625 rep_id_val,
626 rep_bandwidth_val,
627 initialization_val);
628
629 if (!rep->init_section->url) {
630 av_free(rep->init_section);
631 xmlFree(initialization_val);
632 xmlFree(range_val);
633 return AVERROR(ENOMEM);
634 }
635 xmlFree(initialization_val);
636 xmlFree(range_val);
637 }
638 } else if (!av_strcasecmp(fragmenturl_node->name, (const char *)"SegmentURL")) {
639 media_val = xmlGetProp(fragmenturl_node, "media");
640 range_val = xmlGetProp(fragmenturl_node, "mediaRange");
641 if (media_val || range_val) {
642 struct fragment *seg = get_Fragment(range_val);
643 if (!seg) {
644 xmlFree(media_val);
645 xmlFree(range_val);
646 return AVERROR(ENOMEM);
647 }
648 seg->url = get_content_url(baseurl_nodes, 4,
649 max_url_size,
650 rep_id_val,
651 rep_bandwidth_val,
652 media_val);
653 if (!seg->url) {
654 av_free(seg);
655 xmlFree(media_val);
656 xmlFree(range_val);
657 return AVERROR(ENOMEM);
658 }
659 dynarray_add(&rep->fragments, &rep->n_fragments, seg);
660 xmlFree(media_val);
661 xmlFree(range_val);
662 }
663 }
664
665 return 0;
666 }
667
parse_manifest_segmenttimeline(AVFormatContext * s,struct representation * rep,xmlNodePtr fragment_timeline_node)668 static int parse_manifest_segmenttimeline(AVFormatContext *s, struct representation *rep,
669 xmlNodePtr fragment_timeline_node)
670 {
671 xmlAttrPtr attr = NULL;
672 char *val = NULL;
673
674 if (!av_strcasecmp(fragment_timeline_node->name, (const char *)"S")) {
675 struct timeline *tml = av_mallocz(sizeof(struct timeline));
676 if (!tml) {
677 return AVERROR(ENOMEM);
678 }
679 attr = fragment_timeline_node->properties;
680 while (attr) {
681 val = xmlGetProp(fragment_timeline_node, attr->name);
682
683 if (!val) {
684 av_log(s, AV_LOG_WARNING, "parse_manifest_segmenttimeline attr->name = %s val is NULL\n", attr->name);
685 continue;
686 }
687
688 if (!av_strcasecmp(attr->name, (const char *)"t")) {
689 tml->starttime = (int64_t)strtoll(val, NULL, 10);
690 } else if (!av_strcasecmp(attr->name, (const char *)"r")) {
691 tml->repeat =(int64_t) strtoll(val, NULL, 10);
692 } else if (!av_strcasecmp(attr->name, (const char *)"d")) {
693 tml->duration = (int64_t)strtoll(val, NULL, 10);
694 }
695 attr = attr->next;
696 xmlFree(val);
697 }
698 dynarray_add(&rep->timelines, &rep->n_timelines, tml);
699 }
700
701 return 0;
702 }
703
resolve_content_path(AVFormatContext * s,const char * url,int * max_url_size,xmlNodePtr * baseurl_nodes,int n_baseurl_nodes)704 static int resolve_content_path(AVFormatContext *s, const char *url, int *max_url_size, xmlNodePtr *baseurl_nodes, int n_baseurl_nodes)
705 {
706 char *tmp_str = NULL;
707 char *path = NULL;
708 char *mpdName = NULL;
709 xmlNodePtr node = NULL;
710 char *baseurl = NULL;
711 char *root_url = NULL;
712 char *text = NULL;
713 char *tmp = NULL;
714 int isRootHttp = 0;
715 char token ='/';
716 int start = 0;
717 int rootId = 0;
718 int updated = 0;
719 int size = 0;
720 int i;
721 int tmp_max_url_size = strlen(url);
722
723 for (i = n_baseurl_nodes-1; i >= 0 ; i--) {
724 text = xmlNodeGetContent(baseurl_nodes[i]);
725 if (!text)
726 continue;
727 tmp_max_url_size += strlen(text);
728 if (ishttp(text)) {
729 xmlFree(text);
730 break;
731 }
732 xmlFree(text);
733 }
734
735 tmp_max_url_size = aligned(tmp_max_url_size);
736 text = av_mallocz(tmp_max_url_size);
737 if (!text) {
738 updated = AVERROR(ENOMEM);
739 goto end;
740 }
741 av_strlcpy(text, url, strlen(url)+1);
742 tmp = text;
743 while (mpdName = av_strtok(tmp, "/", &tmp)) {
744 size = strlen(mpdName);
745 }
746 av_free(text);
747
748 path = av_mallocz(tmp_max_url_size);
749 tmp_str = av_mallocz(tmp_max_url_size);
750 if (!tmp_str || !path) {
751 updated = AVERROR(ENOMEM);
752 goto end;
753 }
754
755 av_strlcpy (path, url, strlen(url) - size + 1);
756 for (rootId = n_baseurl_nodes - 1; rootId > 0; rootId --) {
757 if (!(node = baseurl_nodes[rootId])) {
758 continue;
759 }
760 text = xmlNodeGetContent(node);
761 if (ishttp(text)) {
762 xmlFree(text);
763 break;
764 }
765 xmlFree(text);
766 }
767
768 node = baseurl_nodes[rootId];
769 baseurl = xmlNodeGetContent(node);
770 root_url = (av_strcasecmp(baseurl, "")) ? baseurl : path;
771 if (node) {
772 xmlNodeSetContent(node, root_url);
773 updated = 1;
774 }
775
776 size = strlen(root_url);
777 isRootHttp = ishttp(root_url);
778
779 if (root_url[size - 1] != token) {
780 av_strlcat(root_url, "/", size + 2);
781 size += 2;
782 }
783
784 for (i = 0; i < n_baseurl_nodes; ++i) {
785 if (i == rootId) {
786 continue;
787 }
788 text = xmlNodeGetContent(baseurl_nodes[i]);
789 if (text && !av_strstart(text, "/", NULL)) {
790 memset(tmp_str, 0, strlen(tmp_str));
791 if (!ishttp(text) && isRootHttp) {
792 av_strlcpy(tmp_str, root_url, size + 1);
793 }
794 start = (text[0] == token);
795 if (start && av_stristr(tmp_str, text)) {
796 char *p = tmp_str;
797 if (!av_strncasecmp(tmp_str, "http://", 7)) {
798 p += 7;
799 } else if (!av_strncasecmp(tmp_str, "https://", 8)) {
800 p += 8;
801 }
802 p = strchr(p, '/');
803 memset(p + 1, 0, strlen(p));
804 }
805 av_strlcat(tmp_str, text + start, tmp_max_url_size);
806 xmlNodeSetContent(baseurl_nodes[i], tmp_str);
807 updated = 1;
808 xmlFree(text);
809 }
810 }
811
812 end:
813 if (tmp_max_url_size > *max_url_size) {
814 *max_url_size = tmp_max_url_size;
815 }
816 av_free(path);
817 av_free(tmp_str);
818 xmlFree(baseurl);
819 return updated;
820
821 }
822
parse_manifest_representation(AVFormatContext * s,const char * url,xmlNodePtr node,xmlNodePtr adaptionset_node,xmlNodePtr mpd_baseurl_node,xmlNodePtr period_baseurl_node,xmlNodePtr period_segmenttemplate_node,xmlNodePtr period_segmentlist_node,xmlNodePtr fragment_template_node,xmlNodePtr content_component_node,xmlNodePtr adaptionset_baseurl_node,xmlNodePtr adaptionset_segmentlist_node,xmlNodePtr adaptionset_supplementalproperty_node)823 static int parse_manifest_representation(AVFormatContext *s, const char *url,
824 xmlNodePtr node,
825 xmlNodePtr adaptionset_node,
826 xmlNodePtr mpd_baseurl_node,
827 xmlNodePtr period_baseurl_node,
828 xmlNodePtr period_segmenttemplate_node,
829 xmlNodePtr period_segmentlist_node,
830 xmlNodePtr fragment_template_node,
831 xmlNodePtr content_component_node,
832 xmlNodePtr adaptionset_baseurl_node,
833 xmlNodePtr adaptionset_segmentlist_node,
834 xmlNodePtr adaptionset_supplementalproperty_node)
835 {
836 int32_t ret = 0;
837 int32_t subtitle_rep_idx = 0;
838 int32_t audio_rep_idx = 0;
839 int32_t video_rep_idx = 0;
840 DASHContext *c = s->priv_data;
841 struct representation *rep = NULL;
842 struct fragment *seg = NULL;
843 xmlNodePtr representation_segmenttemplate_node = NULL;
844 xmlNodePtr representation_baseurl_node = NULL;
845 xmlNodePtr representation_segmentlist_node = NULL;
846 xmlNodePtr segmentlists_tab[3];
847 xmlNodePtr fragment_timeline_node = NULL;
848 xmlNodePtr fragment_templates_tab[5];
849 char *duration_val = NULL;
850 char *presentation_timeoffset_val = NULL;
851 char *startnumber_val = NULL;
852 char *timescale_val = NULL;
853 char *initialization_val = NULL;
854 char *media_val = NULL;
855 char *val = NULL;
856 xmlNodePtr baseurl_nodes[4];
857 xmlNodePtr representation_node = node;
858 char *rep_id_val = xmlGetProp(representation_node, "id");
859 char *rep_bandwidth_val = xmlGetProp(representation_node, "bandwidth");
860 char *rep_framerate_val = xmlGetProp(representation_node, "frameRate");
861 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
862
863 // try get information from representation
864 if (type == AVMEDIA_TYPE_UNKNOWN)
865 type = get_content_type(representation_node);
866 // try get information from contentComponen
867 if (type == AVMEDIA_TYPE_UNKNOWN)
868 type = get_content_type(content_component_node);
869 // try get information from adaption set
870 if (type == AVMEDIA_TYPE_UNKNOWN)
871 type = get_content_type(adaptionset_node);
872 if (type == AVMEDIA_TYPE_UNKNOWN) {
873 av_log(s, AV_LOG_VERBOSE, "Parsing '%s' - skipp not supported representation type\n", url);
874 } else if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO || type == AVMEDIA_TYPE_SUBTITLE) {
875 // convert selected representation to our internal struct
876 rep = av_mallocz(sizeof(struct representation));
877 if (!rep) {
878 ret = AVERROR(ENOMEM);
879 goto end;
880 }
881 if (c->adaptionset_lang) {
882 rep->lang = av_strdup(c->adaptionset_lang);
883 if (!rep->lang) {
884 av_log(s, AV_LOG_ERROR, "alloc language memory failure\n");
885 av_freep(&rep);
886 ret = AVERROR(ENOMEM);
887 goto end;
888 }
889 }
890 rep->parent = s;
891 representation_segmenttemplate_node = find_child_node_by_name(representation_node, "SegmentTemplate");
892 representation_baseurl_node = find_child_node_by_name(representation_node, "BaseURL");
893 representation_segmentlist_node = find_child_node_by_name(representation_node, "SegmentList");
894
895 baseurl_nodes[0] = mpd_baseurl_node;
896 baseurl_nodes[1] = period_baseurl_node;
897 baseurl_nodes[2] = adaptionset_baseurl_node;
898 baseurl_nodes[3] = representation_baseurl_node;
899
900 ret = resolve_content_path(s, url, &c->max_url_size, baseurl_nodes, 4);
901 c->max_url_size = aligned(c->max_url_size
902 + (rep_id_val ? strlen(rep_id_val) : 0)
903 + (rep_bandwidth_val ? strlen(rep_bandwidth_val) : 0));
904 if (ret == AVERROR(ENOMEM) || ret == 0) {
905 goto end;
906 }
907 if (representation_segmenttemplate_node || fragment_template_node || period_segmenttemplate_node) {
908 fragment_timeline_node = NULL;
909 fragment_templates_tab[0] = representation_segmenttemplate_node;
910 fragment_templates_tab[1] = adaptionset_segmentlist_node;
911 fragment_templates_tab[2] = fragment_template_node;
912 fragment_templates_tab[3] = period_segmenttemplate_node;
913 fragment_templates_tab[4] = period_segmentlist_node;
914
915 presentation_timeoffset_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "presentationTimeOffset");
916 duration_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "duration");
917 startnumber_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "startNumber");
918 timescale_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "timescale");
919 initialization_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "initialization");
920 media_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "media");
921
922 if (initialization_val) {
923 rep->init_section = av_mallocz(sizeof(struct fragment));
924 if (!rep->init_section) {
925 av_free(rep);
926 ret = AVERROR(ENOMEM);
927 goto end;
928 }
929 c->max_url_size = aligned(c->max_url_size + strlen(initialization_val));
930 rep->init_section->url = get_content_url(baseurl_nodes, 4, c->max_url_size, rep_id_val, rep_bandwidth_val, initialization_val);
931 if (!rep->init_section->url) {
932 av_free(rep->init_section);
933 av_free(rep);
934 ret = AVERROR(ENOMEM);
935 goto end;
936 }
937 rep->init_section->size = -1;
938 xmlFree(initialization_val);
939 }
940
941 if (media_val) {
942 c->max_url_size = aligned(c->max_url_size + strlen(media_val));
943 rep->url_template = get_content_url(baseurl_nodes, 4, c->max_url_size, rep_id_val, rep_bandwidth_val, media_val);
944 xmlFree(media_val);
945 }
946
947 if (presentation_timeoffset_val) {
948 rep->presentation_timeoffset = (int64_t) strtoll(presentation_timeoffset_val, NULL, 10);
949 av_log(s, AV_LOG_TRACE, "rep->presentation_timeoffset = [%"PRId64"]\n", rep->presentation_timeoffset);
950 xmlFree(presentation_timeoffset_val);
951 }
952 if (duration_val) {
953 rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10);
954 av_log(s, AV_LOG_TRACE, "rep->fragment_duration = [%"PRId64"]\n", rep->fragment_duration);
955 xmlFree(duration_val);
956 }
957 if (timescale_val) {
958 rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10);
959 av_log(s, AV_LOG_TRACE, "rep->fragment_timescale = [%"PRId64"]\n", rep->fragment_timescale);
960 xmlFree(timescale_val);
961 }
962 if (startnumber_val) {
963 rep->start_number = rep->first_seq_no = (int64_t) strtoll(startnumber_val, NULL, 10);
964 av_log(s, AV_LOG_TRACE, "rep->first_seq_no = [%"PRId64"]\n", rep->first_seq_no);
965 xmlFree(startnumber_val);
966 }
967 if (adaptionset_supplementalproperty_node) {
968 if (!av_strcasecmp(xmlGetProp(adaptionset_supplementalproperty_node,"schemeIdUri"), "http://dashif.org/guidelines/last-segment-number")) {
969 val = xmlGetProp(adaptionset_supplementalproperty_node,"value");
970 if (!val) {
971 av_log(s, AV_LOG_ERROR, "Missing value attribute in adaptionset_supplementalproperty_node\n");
972 } else {
973 rep->last_seq_no =(int64_t) strtoll(val, NULL, 10) - 1;
974 xmlFree(val);
975 }
976 }
977 }
978
979 fragment_timeline_node = find_child_node_by_name(representation_segmenttemplate_node, "SegmentTimeline");
980
981 if (!fragment_timeline_node)
982 fragment_timeline_node = find_child_node_by_name(fragment_template_node, "SegmentTimeline");
983 if (!fragment_timeline_node)
984 fragment_timeline_node = find_child_node_by_name(adaptionset_segmentlist_node, "SegmentTimeline");
985 if (!fragment_timeline_node)
986 fragment_timeline_node = find_child_node_by_name(period_segmentlist_node, "SegmentTimeline");
987 if (fragment_timeline_node) {
988 fragment_timeline_node = xmlFirstElementChild(fragment_timeline_node);
989 while (fragment_timeline_node) {
990 ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node);
991 if (ret < 0) {
992 return ret;
993 }
994 fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node);
995 }
996 }
997 } else if (representation_baseurl_node && !representation_segmentlist_node) {
998 seg = av_mallocz(sizeof(struct fragment));
999 if (!seg) {
1000 ret = AVERROR(ENOMEM);
1001 goto end;
1002 }
1003 seg->url = get_content_url(baseurl_nodes, 4, c->max_url_size, rep_id_val, rep_bandwidth_val, NULL);
1004 if (!seg->url) {
1005 av_free(seg);
1006 ret = AVERROR(ENOMEM);
1007 goto end;
1008 }
1009 seg->size = -1;
1010 dynarray_add(&rep->fragments, &rep->n_fragments, seg);
1011 } else if (representation_segmentlist_node) {
1012 // TODO: https://www.brendanlong.com/the-structure-of-an-mpeg-dash-mpd.html
1013 // http://www-itec.uni-klu.ac.at/dash/ddash/mpdGenerator.php?fragmentlength=15&type=full
1014 xmlNodePtr fragmenturl_node = NULL;
1015 segmentlists_tab[0] = representation_segmentlist_node;
1016 segmentlists_tab[1] = adaptionset_segmentlist_node;
1017 segmentlists_tab[2] = period_segmentlist_node;
1018
1019 duration_val = get_val_from_nodes_tab(segmentlists_tab, 3, "duration");
1020 timescale_val = get_val_from_nodes_tab(segmentlists_tab, 3, "timescale");
1021 startnumber_val = get_val_from_nodes_tab(segmentlists_tab, 3, "startNumber");
1022 if (duration_val) {
1023 rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10);
1024 av_log(s, AV_LOG_TRACE, "rep->fragment_duration = [%"PRId64"]\n", rep->fragment_duration);
1025 xmlFree(duration_val);
1026 }
1027 if (timescale_val) {
1028 rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10);
1029 av_log(s, AV_LOG_TRACE, "rep->fragment_timescale = [%"PRId64"]\n", rep->fragment_timescale);
1030 xmlFree(timescale_val);
1031 }
1032 if (startnumber_val) {
1033 rep->start_number = rep->first_seq_no = (int64_t) strtoll(startnumber_val, NULL, 10);
1034 av_log(s, AV_LOG_TRACE, "rep->first_seq_no = [%"PRId64"]\n", rep->first_seq_no);
1035 xmlFree(startnumber_val);
1036 }
1037
1038 fragmenturl_node = xmlFirstElementChild(representation_segmentlist_node);
1039 while (fragmenturl_node) {
1040 ret = parse_manifest_segmenturlnode(s, rep, fragmenturl_node,
1041 baseurl_nodes,
1042 rep_id_val,
1043 rep_bandwidth_val);
1044 if (ret < 0) {
1045 return ret;
1046 }
1047 fragmenturl_node = xmlNextElementSibling(fragmenturl_node);
1048 }
1049
1050 fragment_timeline_node = find_child_node_by_name(representation_segmenttemplate_node, "SegmentTimeline");
1051
1052 if (!fragment_timeline_node)
1053 fragment_timeline_node = find_child_node_by_name(fragment_template_node, "SegmentTimeline");
1054 if (!fragment_timeline_node)
1055 fragment_timeline_node = find_child_node_by_name(adaptionset_segmentlist_node, "SegmentTimeline");
1056 if (!fragment_timeline_node)
1057 fragment_timeline_node = find_child_node_by_name(period_segmentlist_node, "SegmentTimeline");
1058 if (fragment_timeline_node) {
1059 fragment_timeline_node = xmlFirstElementChild(fragment_timeline_node);
1060 while (fragment_timeline_node) {
1061 ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node);
1062 if (ret < 0) {
1063 return ret;
1064 }
1065 fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node);
1066 }
1067 }
1068 } else {
1069 free_representation(rep);
1070 rep = NULL;
1071 av_log(s, AV_LOG_ERROR, "Unknown format of Representation node id[%s] \n", (const char *)rep_id_val);
1072 }
1073
1074 if (rep) {
1075 if (rep->fragment_duration > 0 && !rep->fragment_timescale)
1076 rep->fragment_timescale = 1;
1077 rep->bandwidth = rep_bandwidth_val ? atoi(rep_bandwidth_val) : 0;
1078 strncpy(rep->id, rep_id_val ? rep_id_val : "", sizeof(rep->id));
1079 rep->framerate = av_make_q(0, 0);
1080 if (type == AVMEDIA_TYPE_VIDEO && rep_framerate_val) {
1081 ret = av_parse_video_rate(&rep->framerate, rep_framerate_val);
1082 if (ret < 0)
1083 av_log(s, AV_LOG_VERBOSE, "Ignoring invalid frame rate '%s'\n", rep_framerate_val);
1084 }
1085
1086 switch (type) {
1087 case AVMEDIA_TYPE_VIDEO:
1088 rep->rep_idx = video_rep_idx;
1089 dynarray_add(&c->videos, &c->n_videos, rep);
1090 break;
1091 case AVMEDIA_TYPE_AUDIO:
1092 rep->rep_idx = audio_rep_idx;
1093 dynarray_add(&c->audios, &c->n_audios, rep);
1094 break;
1095 case AVMEDIA_TYPE_SUBTITLE:
1096 rep->rep_idx = subtitle_rep_idx;
1097 dynarray_add(&c->subtitles, &c->n_subtitles, rep);
1098 break;
1099 default:
1100 av_log(s, AV_LOG_WARNING, "Unsupported the stream type %d\n", type);
1101 break;
1102 }
1103 }
1104 }
1105
1106 video_rep_idx += type == AVMEDIA_TYPE_VIDEO;
1107 audio_rep_idx += type == AVMEDIA_TYPE_AUDIO;
1108 subtitle_rep_idx += type == AVMEDIA_TYPE_SUBTITLE;
1109
1110 end:
1111 if (rep_id_val)
1112 xmlFree(rep_id_val);
1113 if (rep_bandwidth_val)
1114 xmlFree(rep_bandwidth_val);
1115 if (rep_framerate_val)
1116 xmlFree(rep_framerate_val);
1117
1118 return ret;
1119 }
1120
parse_manifest_adaptationset_attr(AVFormatContext * s,xmlNodePtr adaptionset_node)1121 static int parse_manifest_adaptationset_attr(AVFormatContext *s, xmlNodePtr adaptionset_node)
1122 {
1123 DASHContext *c = s->priv_data;
1124
1125 if (!adaptionset_node) {
1126 av_log(s, AV_LOG_WARNING, "Cannot get AdaptionSet\n");
1127 return AVERROR(EINVAL);
1128 }
1129 c->adaptionset_lang = xmlGetProp(adaptionset_node, "lang");
1130
1131 return 0;
1132 }
1133
parse_manifest_adaptationset(AVFormatContext * s,const char * url,xmlNodePtr adaptionset_node,xmlNodePtr mpd_baseurl_node,xmlNodePtr period_baseurl_node,xmlNodePtr period_segmenttemplate_node,xmlNodePtr period_segmentlist_node)1134 static int parse_manifest_adaptationset(AVFormatContext *s, const char *url,
1135 xmlNodePtr adaptionset_node,
1136 xmlNodePtr mpd_baseurl_node,
1137 xmlNodePtr period_baseurl_node,
1138 xmlNodePtr period_segmenttemplate_node,
1139 xmlNodePtr period_segmentlist_node)
1140 {
1141 int ret = 0;
1142 DASHContext *c = s->priv_data;
1143 xmlNodePtr fragment_template_node = NULL;
1144 xmlNodePtr content_component_node = NULL;
1145 xmlNodePtr adaptionset_baseurl_node = NULL;
1146 xmlNodePtr adaptionset_segmentlist_node = NULL;
1147 xmlNodePtr adaptionset_supplementalproperty_node = NULL;
1148 xmlNodePtr node = NULL;
1149
1150 ret = parse_manifest_adaptationset_attr(s, adaptionset_node);
1151 if (ret < 0)
1152 return ret;
1153
1154 node = xmlFirstElementChild(adaptionset_node);
1155 while (node) {
1156 if (!av_strcasecmp(node->name, (const char *)"SegmentTemplate")) {
1157 fragment_template_node = node;
1158 } else if (!av_strcasecmp(node->name, (const char *)"ContentComponent")) {
1159 content_component_node = node;
1160 } else if (!av_strcasecmp(node->name, (const char *)"BaseURL")) {
1161 adaptionset_baseurl_node = node;
1162 } else if (!av_strcasecmp(node->name, (const char *)"SegmentList")) {
1163 adaptionset_segmentlist_node = node;
1164 } else if (!av_strcasecmp(node->name, (const char *)"SupplementalProperty")) {
1165 adaptionset_supplementalproperty_node = node;
1166 } else if (!av_strcasecmp(node->name, (const char *)"Representation")) {
1167 ret = parse_manifest_representation(s, url, node,
1168 adaptionset_node,
1169 mpd_baseurl_node,
1170 period_baseurl_node,
1171 period_segmenttemplate_node,
1172 period_segmentlist_node,
1173 fragment_template_node,
1174 content_component_node,
1175 adaptionset_baseurl_node,
1176 adaptionset_segmentlist_node,
1177 adaptionset_supplementalproperty_node);
1178 if (ret < 0)
1179 goto err;
1180 }
1181 node = xmlNextElementSibling(node);
1182 }
1183
1184 err:
1185 av_freep(&c->adaptionset_lang);
1186 return ret;
1187 }
1188
parse_programinformation(AVFormatContext * s,xmlNodePtr node)1189 static int parse_programinformation(AVFormatContext *s, xmlNodePtr node)
1190 {
1191 xmlChar *val = NULL;
1192
1193 node = xmlFirstElementChild(node);
1194 while (node) {
1195 if (!av_strcasecmp(node->name, "Title")) {
1196 val = xmlNodeGetContent(node);
1197 if (val) {
1198 av_dict_set(&s->metadata, "Title", val, 0);
1199 }
1200 } else if (!av_strcasecmp(node->name, "Source")) {
1201 val = xmlNodeGetContent(node);
1202 if (val) {
1203 av_dict_set(&s->metadata, "Source", val, 0);
1204 }
1205 } else if (!av_strcasecmp(node->name, "Copyright")) {
1206 val = xmlNodeGetContent(node);
1207 if (val) {
1208 av_dict_set(&s->metadata, "Copyright", val, 0);
1209 }
1210 }
1211 node = xmlNextElementSibling(node);
1212 xmlFree(val);
1213 val = NULL;
1214 }
1215 return 0;
1216 }
1217
parse_manifest(AVFormatContext * s,const char * url,AVIOContext * in)1218 static int parse_manifest(AVFormatContext *s, const char *url, AVIOContext *in)
1219 {
1220 DASHContext *c = s->priv_data;
1221 int ret = 0;
1222 int close_in = 0;
1223 uint8_t *new_url = NULL;
1224 int64_t filesize = 0;
1225 AVBPrint buf;
1226 AVDictionary *opts = NULL;
1227 xmlDoc *doc = NULL;
1228 xmlNodePtr root_element = NULL;
1229 xmlNodePtr node = NULL;
1230 xmlNodePtr period_node = NULL;
1231 xmlNodePtr tmp_node = NULL;
1232 xmlNodePtr mpd_baseurl_node = NULL;
1233 xmlNodePtr period_baseurl_node = NULL;
1234 xmlNodePtr period_segmenttemplate_node = NULL;
1235 xmlNodePtr period_segmentlist_node = NULL;
1236 xmlNodePtr adaptionset_node = NULL;
1237 xmlAttrPtr attr = NULL;
1238 char *val = NULL;
1239 uint32_t period_duration_sec = 0;
1240 uint32_t period_start_sec = 0;
1241
1242 if (!in) {
1243 close_in = 1;
1244
1245 av_dict_copy(&opts, c->avio_opts, 0);
1246 ret = avio_open2(&in, url, AVIO_FLAG_READ, c->interrupt_callback, &opts);
1247 av_dict_free(&opts);
1248 if (ret < 0)
1249 return ret;
1250 }
1251
1252 if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0) {
1253 c->base_url = av_strdup(new_url);
1254 } else {
1255 c->base_url = av_strdup(url);
1256 }
1257
1258 filesize = avio_size(in);
1259 if (filesize > MAX_MANIFEST_SIZE) {
1260 av_log(s, AV_LOG_ERROR, "Manifest too large: %"PRId64"\n", filesize);
1261 return AVERROR_INVALIDDATA;
1262 }
1263
1264 av_bprint_init(&buf, (filesize > 0) ? filesize + 1 : DEFAULT_MANIFEST_SIZE, AV_BPRINT_SIZE_UNLIMITED);
1265
1266 if ((ret = avio_read_to_bprint(in, &buf, MAX_MANIFEST_SIZE)) < 0 ||
1267 !avio_feof(in) ||
1268 (filesize = buf.len) == 0) {
1269 av_log(s, AV_LOG_ERROR, "Unable to read to manifest '%s'\n", url);
1270 if (ret == 0)
1271 ret = AVERROR_INVALIDDATA;
1272 } else {
1273 LIBXML_TEST_VERSION
1274
1275 doc = xmlReadMemory(buf.str, filesize, c->base_url, NULL, 0);
1276 root_element = xmlDocGetRootElement(doc);
1277 node = root_element;
1278
1279 if (!node) {
1280 ret = AVERROR_INVALIDDATA;
1281 av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing root node\n", url);
1282 goto cleanup;
1283 }
1284
1285 if (node->type != XML_ELEMENT_NODE ||
1286 av_strcasecmp(node->name, (const char *)"MPD")) {
1287 ret = AVERROR_INVALIDDATA;
1288 av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - wrong root node name[%s] type[%d]\n", url, node->name, (int)node->type);
1289 goto cleanup;
1290 }
1291
1292 val = xmlGetProp(node, "type");
1293 if (!val) {
1294 av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing type attrib\n", url);
1295 ret = AVERROR_INVALIDDATA;
1296 goto cleanup;
1297 }
1298 if (!av_strcasecmp(val, (const char *)"dynamic"))
1299 c->is_live = 1;
1300 xmlFree(val);
1301
1302 attr = node->properties;
1303 while (attr) {
1304 val = xmlGetProp(node, attr->name);
1305
1306 if (!av_strcasecmp(attr->name, (const char *)"availabilityStartTime")) {
1307 c->availability_start_time = get_utc_date_time_insec(s, (const char *)val);
1308 av_log(s, AV_LOG_TRACE, "c->availability_start_time = [%"PRId64"]\n", c->availability_start_time);
1309 } else if (!av_strcasecmp(attr->name, (const char *)"availabilityEndTime")) {
1310 c->availability_end_time = get_utc_date_time_insec(s, (const char *)val);
1311 av_log(s, AV_LOG_TRACE, "c->availability_end_time = [%"PRId64"]\n", c->availability_end_time);
1312 } else if (!av_strcasecmp(attr->name, (const char *)"publishTime")) {
1313 c->publish_time = get_utc_date_time_insec(s, (const char *)val);
1314 av_log(s, AV_LOG_TRACE, "c->publish_time = [%"PRId64"]\n", c->publish_time);
1315 } else if (!av_strcasecmp(attr->name, (const char *)"minimumUpdatePeriod")) {
1316 c->minimum_update_period = get_duration_insec(s, (const char *)val);
1317 av_log(s, AV_LOG_TRACE, "c->minimum_update_period = [%"PRId64"]\n", c->minimum_update_period);
1318 } else if (!av_strcasecmp(attr->name, (const char *)"timeShiftBufferDepth")) {
1319 c->time_shift_buffer_depth = get_duration_insec(s, (const char *)val);
1320 av_log(s, AV_LOG_TRACE, "c->time_shift_buffer_depth = [%"PRId64"]\n", c->time_shift_buffer_depth);
1321 } else if (!av_strcasecmp(attr->name, (const char *)"minBufferTime")) {
1322 c->min_buffer_time = get_duration_insec(s, (const char *)val);
1323 av_log(s, AV_LOG_TRACE, "c->min_buffer_time = [%"PRId64"]\n", c->min_buffer_time);
1324 } else if (!av_strcasecmp(attr->name, (const char *)"suggestedPresentationDelay")) {
1325 c->suggested_presentation_delay = get_duration_insec(s, (const char *)val);
1326 av_log(s, AV_LOG_TRACE, "c->suggested_presentation_delay = [%"PRId64"]\n", c->suggested_presentation_delay);
1327 } else if (!av_strcasecmp(attr->name, (const char *)"mediaPresentationDuration")) {
1328 c->media_presentation_duration = get_duration_insec(s, (const char *)val);
1329 av_log(s, AV_LOG_TRACE, "c->media_presentation_duration = [%"PRId64"]\n", c->media_presentation_duration);
1330 }
1331 attr = attr->next;
1332 xmlFree(val);
1333 }
1334
1335 tmp_node = find_child_node_by_name(node, "BaseURL");
1336 if (tmp_node) {
1337 mpd_baseurl_node = xmlCopyNode(tmp_node,1);
1338 } else {
1339 mpd_baseurl_node = xmlNewNode(NULL, "BaseURL");
1340 }
1341
1342 // at now we can handle only one period, with the longest duration
1343 node = xmlFirstElementChild(node);
1344 while (node) {
1345 if (!av_strcasecmp(node->name, (const char *)"Period")) {
1346 period_duration_sec = 0;
1347 period_start_sec = 0;
1348 attr = node->properties;
1349 while (attr) {
1350 val = xmlGetProp(node, attr->name);
1351 if (!av_strcasecmp(attr->name, (const char *)"duration")) {
1352 period_duration_sec = get_duration_insec(s, (const char *)val);
1353 } else if (!av_strcasecmp(attr->name, (const char *)"start")) {
1354 period_start_sec = get_duration_insec(s, (const char *)val);
1355 }
1356 attr = attr->next;
1357 xmlFree(val);
1358 }
1359 if ((period_duration_sec) >= (c->period_duration)) {
1360 period_node = node;
1361 c->period_duration = period_duration_sec;
1362 c->period_start = period_start_sec;
1363 if (c->period_start > 0)
1364 c->media_presentation_duration = c->period_duration;
1365 }
1366 } else if (!av_strcasecmp(node->name, "ProgramInformation")) {
1367 parse_programinformation(s, node);
1368 }
1369 node = xmlNextElementSibling(node);
1370 }
1371 if (!period_node) {
1372 av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing Period node\n", url);
1373 ret = AVERROR_INVALIDDATA;
1374 goto cleanup;
1375 }
1376
1377 adaptionset_node = xmlFirstElementChild(period_node);
1378 while (adaptionset_node) {
1379 if (!av_strcasecmp(adaptionset_node->name, (const char *)"BaseURL")) {
1380 period_baseurl_node = adaptionset_node;
1381 } else if (!av_strcasecmp(adaptionset_node->name, (const char *)"SegmentTemplate")) {
1382 period_segmenttemplate_node = adaptionset_node;
1383 } else if (!av_strcasecmp(adaptionset_node->name, (const char *)"SegmentList")) {
1384 period_segmentlist_node = adaptionset_node;
1385 } else if (!av_strcasecmp(adaptionset_node->name, (const char *)"AdaptationSet")) {
1386 parse_manifest_adaptationset(s, url, adaptionset_node, mpd_baseurl_node, period_baseurl_node, period_segmenttemplate_node, period_segmentlist_node);
1387 }
1388 adaptionset_node = xmlNextElementSibling(adaptionset_node);
1389 }
1390 cleanup:
1391 /*free the document */
1392 xmlFreeDoc(doc);
1393 xmlCleanupParser();
1394 xmlFreeNode(mpd_baseurl_node);
1395 }
1396
1397 av_free(new_url);
1398 av_bprint_finalize(&buf, NULL);
1399 if (close_in) {
1400 avio_close(in);
1401 }
1402 return ret;
1403 }
1404
calc_cur_seg_no(AVFormatContext * s,struct representation * pls)1405 static int64_t calc_cur_seg_no(AVFormatContext *s, struct representation *pls)
1406 {
1407 DASHContext *c = s->priv_data;
1408 int64_t num = 0;
1409 int64_t start_time_offset = 0;
1410
1411 if (c->is_live) {
1412 if (pls->n_fragments) {
1413 av_log(s, AV_LOG_TRACE, "in n_fragments mode\n");
1414 num = pls->first_seq_no;
1415 } else if (pls->n_timelines) {
1416 av_log(s, AV_LOG_TRACE, "in n_timelines mode\n");
1417 start_time_offset = get_segment_start_time_based_on_timeline(pls, 0xFFFFFFFF) - 60 * pls->fragment_timescale; // 60 seconds before end
1418 num = calc_next_seg_no_from_timelines(pls, start_time_offset);
1419 if (num == -1)
1420 num = pls->first_seq_no;
1421 else
1422 num += pls->first_seq_no;
1423 } else if (pls->fragment_duration){
1424 av_log(s, AV_LOG_TRACE, "in fragment_duration mode fragment_timescale = %"PRId64", presentation_timeoffset = %"PRId64"\n", pls->fragment_timescale, pls->presentation_timeoffset);
1425 if (pls->presentation_timeoffset) {
1426 num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) * pls->fragment_timescale)-pls->presentation_timeoffset) / pls->fragment_duration - c->min_buffer_time;
1427 } else if (c->publish_time > 0 && !c->availability_start_time) {
1428 if (c->min_buffer_time) {
1429 num = pls->first_seq_no + (((c->publish_time + pls->fragment_duration) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration - c->min_buffer_time;
1430 } else {
1431 num = pls->first_seq_no + (((c->publish_time - c->time_shift_buffer_depth + pls->fragment_duration) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration;
1432 }
1433 } else {
1434 num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration;
1435 }
1436 }
1437 } else {
1438 num = pls->first_seq_no;
1439 }
1440 return num;
1441 }
1442
calc_min_seg_no(AVFormatContext * s,struct representation * pls)1443 static int64_t calc_min_seg_no(AVFormatContext *s, struct representation *pls)
1444 {
1445 DASHContext *c = s->priv_data;
1446 int64_t num = 0;
1447
1448 if (c->is_live && pls->fragment_duration) {
1449 av_log(s, AV_LOG_TRACE, "in live mode\n");
1450 num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) - c->time_shift_buffer_depth) * pls->fragment_timescale) / pls->fragment_duration;
1451 } else {
1452 num = pls->first_seq_no;
1453 }
1454 return num;
1455 }
1456
calc_max_seg_no(struct representation * pls,DASHContext * c)1457 static int64_t calc_max_seg_no(struct representation *pls, DASHContext *c)
1458 {
1459 int64_t num = 0;
1460
1461 if (pls->n_fragments) {
1462 num = pls->first_seq_no + pls->n_fragments - 1;
1463 } else if (pls->n_timelines) {
1464 int i = 0;
1465 num = pls->first_seq_no + pls->n_timelines - 1;
1466 for (i = 0; i < pls->n_timelines; i++) {
1467 if (pls->timelines[i]->repeat == -1) {
1468 int length_of_each_segment = pls->timelines[i]->duration / pls->fragment_timescale;
1469 num = c->period_duration / length_of_each_segment;
1470 } else {
1471 num += pls->timelines[i]->repeat;
1472 }
1473 }
1474 } else if (c->is_live && pls->fragment_duration) {
1475 num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time)) * pls->fragment_timescale) / pls->fragment_duration;
1476 } else if (pls->fragment_duration) {
1477 num = pls->first_seq_no + (c->media_presentation_duration * pls->fragment_timescale) / pls->fragment_duration;
1478 }
1479
1480 return num;
1481 }
1482
move_timelines(struct representation * rep_src,struct representation * rep_dest,DASHContext * c)1483 static void move_timelines(struct representation *rep_src, struct representation *rep_dest, DASHContext *c)
1484 {
1485 if (rep_dest && rep_src ) {
1486 free_timelines_list(rep_dest);
1487 rep_dest->timelines = rep_src->timelines;
1488 rep_dest->n_timelines = rep_src->n_timelines;
1489 rep_dest->first_seq_no = rep_src->first_seq_no;
1490 rep_dest->last_seq_no = calc_max_seg_no(rep_dest, c);
1491 rep_src->timelines = NULL;
1492 rep_src->n_timelines = 0;
1493 rep_dest->cur_seq_no = rep_src->cur_seq_no;
1494 }
1495 }
1496
move_segments(struct representation * rep_src,struct representation * rep_dest,DASHContext * c)1497 static void move_segments(struct representation *rep_src, struct representation *rep_dest, DASHContext *c)
1498 {
1499 if (rep_dest && rep_src ) {
1500 free_fragment_list(rep_dest);
1501 if (rep_src->start_number > (rep_dest->start_number + rep_dest->n_fragments))
1502 rep_dest->cur_seq_no = 0;
1503 else
1504 rep_dest->cur_seq_no += rep_src->start_number - rep_dest->start_number;
1505 rep_dest->fragments = rep_src->fragments;
1506 rep_dest->n_fragments = rep_src->n_fragments;
1507 rep_dest->parent = rep_src->parent;
1508 rep_dest->last_seq_no = calc_max_seg_no(rep_dest, c);
1509 rep_src->fragments = NULL;
1510 rep_src->n_fragments = 0;
1511 }
1512 }
1513
1514
refresh_manifest(AVFormatContext * s)1515 static int refresh_manifest(AVFormatContext *s)
1516 {
1517 int ret = 0, i;
1518 DASHContext *c = s->priv_data;
1519 // save current context
1520 int n_videos = c->n_videos;
1521 struct representation **videos = c->videos;
1522 int n_audios = c->n_audios;
1523 struct representation **audios = c->audios;
1524 int n_subtitles = c->n_subtitles;
1525 struct representation **subtitles = c->subtitles;
1526 char *base_url = c->base_url;
1527
1528 c->base_url = NULL;
1529 c->n_videos = 0;
1530 c->videos = NULL;
1531 c->n_audios = 0;
1532 c->audios = NULL;
1533 c->n_subtitles = 0;
1534 c->subtitles = NULL;
1535 ret = parse_manifest(s, s->url, NULL);
1536 if (ret)
1537 goto finish;
1538
1539 if (c->n_videos != n_videos) {
1540 av_log(c, AV_LOG_ERROR,
1541 "new manifest has mismatched no. of video representations, %d -> %d\n",
1542 n_videos, c->n_videos);
1543 return AVERROR_INVALIDDATA;
1544 }
1545 if (c->n_audios != n_audios) {
1546 av_log(c, AV_LOG_ERROR,
1547 "new manifest has mismatched no. of audio representations, %d -> %d\n",
1548 n_audios, c->n_audios);
1549 return AVERROR_INVALIDDATA;
1550 }
1551 if (c->n_subtitles != n_subtitles) {
1552 av_log(c, AV_LOG_ERROR,
1553 "new manifest has mismatched no. of subtitles representations, %d -> %d\n",
1554 n_subtitles, c->n_subtitles);
1555 return AVERROR_INVALIDDATA;
1556 }
1557
1558 for (i = 0; i < n_videos; i++) {
1559 struct representation *cur_video = videos[i];
1560 struct representation *ccur_video = c->videos[i];
1561 if (cur_video->timelines) {
1562 // calc current time
1563 int64_t currentTime = get_segment_start_time_based_on_timeline(cur_video, cur_video->cur_seq_no) / cur_video->fragment_timescale;
1564 // update segments
1565 ccur_video->cur_seq_no = calc_next_seg_no_from_timelines(ccur_video, currentTime * cur_video->fragment_timescale - 1);
1566 if (ccur_video->cur_seq_no >= 0) {
1567 move_timelines(ccur_video, cur_video, c);
1568 }
1569 }
1570 if (cur_video->fragments) {
1571 move_segments(ccur_video, cur_video, c);
1572 }
1573 }
1574 for (i = 0; i < n_audios; i++) {
1575 struct representation *cur_audio = audios[i];
1576 struct representation *ccur_audio = c->audios[i];
1577 if (cur_audio->timelines) {
1578 // calc current time
1579 int64_t currentTime = get_segment_start_time_based_on_timeline(cur_audio, cur_audio->cur_seq_no) / cur_audio->fragment_timescale;
1580 // update segments
1581 ccur_audio->cur_seq_no = calc_next_seg_no_from_timelines(ccur_audio, currentTime * cur_audio->fragment_timescale - 1);
1582 if (ccur_audio->cur_seq_no >= 0) {
1583 move_timelines(ccur_audio, cur_audio, c);
1584 }
1585 }
1586 if (cur_audio->fragments) {
1587 move_segments(ccur_audio, cur_audio, c);
1588 }
1589 }
1590
1591 finish:
1592 // restore context
1593 if (c->base_url)
1594 av_free(base_url);
1595 else
1596 c->base_url = base_url;
1597
1598 if (c->subtitles)
1599 free_subtitle_list(c);
1600 if (c->audios)
1601 free_audio_list(c);
1602 if (c->videos)
1603 free_video_list(c);
1604
1605 c->n_subtitles = n_subtitles;
1606 c->subtitles = subtitles;
1607 c->n_audios = n_audios;
1608 c->audios = audios;
1609 c->n_videos = n_videos;
1610 c->videos = videos;
1611 return ret;
1612 }
1613
get_current_fragment(struct representation * pls)1614 static struct fragment *get_current_fragment(struct representation *pls)
1615 {
1616 int64_t min_seq_no = 0;
1617 int64_t max_seq_no = 0;
1618 struct fragment *seg = NULL;
1619 struct fragment *seg_ptr = NULL;
1620 DASHContext *c = pls->parent->priv_data;
1621
1622 while (( !ff_check_interrupt(c->interrupt_callback)&& pls->n_fragments > 0)) {
1623 if (pls->cur_seq_no < pls->n_fragments) {
1624 seg_ptr = pls->fragments[pls->cur_seq_no];
1625 seg = av_mallocz(sizeof(struct fragment));
1626 if (!seg) {
1627 return NULL;
1628 }
1629 seg->url = av_strdup(seg_ptr->url);
1630 if (!seg->url) {
1631 av_free(seg);
1632 return NULL;
1633 }
1634 seg->size = seg_ptr->size;
1635 seg->url_offset = seg_ptr->url_offset;
1636 return seg;
1637 } else if (c->is_live) {
1638 refresh_manifest(pls->parent);
1639 } else {
1640 break;
1641 }
1642 }
1643 if (c->is_live) {
1644 min_seq_no = calc_min_seg_no(pls->parent, pls);
1645 max_seq_no = calc_max_seg_no(pls, c);
1646
1647 if (pls->timelines || pls->fragments) {
1648 refresh_manifest(pls->parent);
1649 }
1650 if (pls->cur_seq_no <= min_seq_no) {
1651 av_log(pls->parent, AV_LOG_VERBOSE, "old fragment: cur[%"PRId64"] min[%"PRId64"] max[%"PRId64"], playlist %d\n", (int64_t)pls->cur_seq_no, min_seq_no, max_seq_no, (int)pls->rep_idx);
1652 pls->cur_seq_no = calc_cur_seg_no(pls->parent, pls);
1653 } else if (pls->cur_seq_no > max_seq_no) {
1654 av_log(pls->parent, AV_LOG_VERBOSE, "new fragment: min[%"PRId64"] max[%"PRId64"], playlist %d\n", min_seq_no, max_seq_no, (int)pls->rep_idx);
1655 }
1656 seg = av_mallocz(sizeof(struct fragment));
1657 if (!seg) {
1658 return NULL;
1659 }
1660 } else if (pls->cur_seq_no <= pls->last_seq_no) {
1661 seg = av_mallocz(sizeof(struct fragment));
1662 if (!seg) {
1663 return NULL;
1664 }
1665 }
1666 if (seg) {
1667 char *tmpfilename= av_mallocz(c->max_url_size);
1668 if (!tmpfilename) {
1669 return NULL;
1670 }
1671 ff_dash_fill_tmpl_params(tmpfilename, c->max_url_size, pls->url_template, 0, pls->cur_seq_no, 0, get_segment_start_time_based_on_timeline(pls, pls->cur_seq_no));
1672 seg->url = av_strireplace(pls->url_template, pls->url_template, tmpfilename);
1673 if (!seg->url) {
1674 av_log(pls->parent, AV_LOG_WARNING, "Unable to resolve template url '%s', try to use origin template\n", pls->url_template);
1675 seg->url = av_strdup(pls->url_template);
1676 if (!seg->url) {
1677 av_log(pls->parent, AV_LOG_ERROR, "Cannot resolve template url '%s'\n", pls->url_template);
1678 av_free(tmpfilename);
1679 return NULL;
1680 }
1681 }
1682 av_free(tmpfilename);
1683 seg->size = -1;
1684 }
1685
1686 return seg;
1687 }
1688
read_from_url(struct representation * pls,struct fragment * seg,uint8_t * buf,int buf_size)1689 static int read_from_url(struct representation *pls, struct fragment *seg,
1690 uint8_t *buf, int buf_size)
1691 {
1692 int ret;
1693
1694 /* limit read if the fragment was only a part of a file */
1695 if (seg->size >= 0)
1696 buf_size = FFMIN(buf_size, pls->cur_seg_size - pls->cur_seg_offset);
1697
1698 ret = avio_read(pls->input, buf, buf_size);
1699 if (ret > 0)
1700 pls->cur_seg_offset += ret;
1701
1702 return ret;
1703 }
1704
open_input(DASHContext * c,struct representation * pls,struct fragment * seg)1705 static int open_input(DASHContext *c, struct representation *pls, struct fragment *seg)
1706 {
1707 AVDictionary *opts = NULL;
1708 char *url = NULL;
1709 int ret = 0;
1710
1711 url = av_mallocz(c->max_url_size);
1712 if (!url) {
1713 ret = AVERROR(ENOMEM);
1714 goto cleanup;
1715 }
1716
1717 if (seg->size >= 0) {
1718 /* try to restrict the HTTP request to the part we want
1719 * (if this is in fact a HTTP request) */
1720 av_dict_set_int(&opts, "offset", seg->url_offset, 0);
1721 av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
1722 }
1723
1724 ff_make_absolute_url(url, c->max_url_size, c->base_url, seg->url);
1725 av_log(pls->parent, AV_LOG_VERBOSE, "DASH request for url '%s', offset %"PRId64", playlist %d\n",
1726 url, seg->url_offset, pls->rep_idx);
1727 ret = open_url(pls->parent, &pls->input, url, c->avio_opts, opts, NULL);
1728
1729 cleanup:
1730 av_free(url);
1731 av_dict_free(&opts);
1732 pls->cur_seg_offset = 0;
1733 pls->cur_seg_size = seg->size;
1734 return ret;
1735 }
1736
update_init_section(struct representation * pls)1737 static int update_init_section(struct representation *pls)
1738 {
1739 static const int max_init_section_size = 1024 * 1024;
1740 DASHContext *c = pls->parent->priv_data;
1741 int64_t sec_size;
1742 int64_t urlsize;
1743 int ret;
1744
1745 if (!pls->init_section || pls->init_sec_buf)
1746 return 0;
1747
1748 ret = open_input(c, pls, pls->init_section);
1749 if (ret < 0) {
1750 av_log(pls->parent, AV_LOG_WARNING,
1751 "Failed to open an initialization section in playlist %d\n",
1752 pls->rep_idx);
1753 return ret;
1754 }
1755
1756 if (pls->init_section->size >= 0)
1757 sec_size = pls->init_section->size;
1758 else if ((urlsize = avio_size(pls->input)) >= 0)
1759 sec_size = urlsize;
1760 else
1761 sec_size = max_init_section_size;
1762
1763 av_log(pls->parent, AV_LOG_DEBUG,
1764 "Downloading an initialization section of size %"PRId64"\n",
1765 sec_size);
1766
1767 sec_size = FFMIN(sec_size, max_init_section_size);
1768
1769 av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
1770
1771 ret = read_from_url(pls, pls->init_section, pls->init_sec_buf,
1772 pls->init_sec_buf_size);
1773 ff_format_io_close(pls->parent, &pls->input);
1774
1775 if (ret < 0)
1776 return ret;
1777
1778 pls->init_sec_data_len = ret;
1779 pls->init_sec_buf_read_offset = 0;
1780
1781 return 0;
1782 }
1783
seek_data(void * opaque,int64_t offset,int whence)1784 static int64_t seek_data(void *opaque, int64_t offset, int whence)
1785 {
1786 struct representation *v = opaque;
1787 if (v->n_fragments && !v->init_sec_data_len) {
1788 return avio_seek(v->input, offset, whence);
1789 }
1790
1791 return AVERROR(ENOSYS);
1792 }
1793
read_data(void * opaque,uint8_t * buf,int buf_size)1794 static int read_data(void *opaque, uint8_t *buf, int buf_size)
1795 {
1796 int ret = 0;
1797 struct representation *v = opaque;
1798 DASHContext *c = v->parent->priv_data;
1799
1800 restart:
1801 if (!v->input) {
1802 free_fragment(&v->cur_seg);
1803 v->cur_seg = get_current_fragment(v);
1804 if (!v->cur_seg) {
1805 ret = AVERROR_EOF;
1806 goto end;
1807 }
1808
1809 /* load/update Media Initialization Section, if any */
1810 ret = update_init_section(v);
1811 if (ret)
1812 goto end;
1813
1814 ret = open_input(c, v, v->cur_seg);
1815 if (ret < 0) {
1816 if (ff_check_interrupt(c->interrupt_callback)) {
1817 ret = AVERROR_EXIT;
1818 goto end;
1819 }
1820 av_log(v->parent, AV_LOG_WARNING, "Failed to open fragment of playlist %d\n", v->rep_idx);
1821 v->cur_seq_no++;
1822 goto restart;
1823 }
1824 }
1825
1826 if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
1827 /* Push init section out first before first actual fragment */
1828 int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
1829 memcpy(buf, v->init_sec_buf, copy_size);
1830 v->init_sec_buf_read_offset += copy_size;
1831 ret = copy_size;
1832 goto end;
1833 }
1834
1835 /* check the v->cur_seg, if it is null, get current and double check if the new v->cur_seg*/
1836 if (!v->cur_seg) {
1837 v->cur_seg = get_current_fragment(v);
1838 }
1839 if (!v->cur_seg) {
1840 ret = AVERROR_EOF;
1841 goto end;
1842 }
1843 ret = read_from_url(v, v->cur_seg, buf, buf_size);
1844 if (ret > 0)
1845 goto end;
1846
1847 if (c->is_live || v->cur_seq_no < v->last_seq_no) {
1848 if (!v->is_restart_needed)
1849 v->cur_seq_no++;
1850 v->is_restart_needed = 1;
1851 }
1852
1853 end:
1854 return ret;
1855 }
1856
save_avio_options(AVFormatContext * s)1857 static int save_avio_options(AVFormatContext *s)
1858 {
1859 DASHContext *c = s->priv_data;
1860 const char *opts[] = {
1861 "headers", "user_agent", "cookies", "http_proxy", "referer", "rw_timeout", "icy", NULL };
1862 const char **opt = opts;
1863 uint8_t *buf = NULL;
1864 int ret = 0;
1865
1866 while (*opt) {
1867 if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN, &buf) >= 0) {
1868 if (buf[0] != '\0') {
1869 ret = av_dict_set(&c->avio_opts, *opt, buf, AV_DICT_DONT_STRDUP_VAL);
1870 if (ret < 0) {
1871 av_freep(&buf);
1872 return ret;
1873 }
1874 } else {
1875 av_freep(&buf);
1876 }
1877 }
1878 opt++;
1879 }
1880
1881 return ret;
1882 }
1883
nested_io_open(AVFormatContext * s,AVIOContext ** pb,const char * url,int flags,AVDictionary ** opts)1884 static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
1885 int flags, AVDictionary **opts)
1886 {
1887 av_log(s, AV_LOG_ERROR,
1888 "A DASH playlist item '%s' referred to an external file '%s'. "
1889 "Opening this file was forbidden for security reasons\n",
1890 s->url, url);
1891 return AVERROR(EPERM);
1892 }
1893
close_demux_for_component(struct representation * pls)1894 static void close_demux_for_component(struct representation *pls)
1895 {
1896 /* note: the internal buffer could have changed */
1897 av_freep(&pls->pb.buffer);
1898 memset(&pls->pb, 0x00, sizeof(AVIOContext));
1899 pls->ctx->pb = NULL;
1900 avformat_close_input(&pls->ctx);
1901 pls->ctx = NULL;
1902 }
1903
reopen_demux_for_component(AVFormatContext * s,struct representation * pls)1904 static int reopen_demux_for_component(AVFormatContext *s, struct representation *pls)
1905 {
1906 DASHContext *c = s->priv_data;
1907 ff_const59 AVInputFormat *in_fmt = NULL;
1908 AVDictionary *in_fmt_opts = NULL;
1909 uint8_t *avio_ctx_buffer = NULL;
1910 int ret = 0, i;
1911
1912 if (pls->ctx) {
1913 close_demux_for_component(pls);
1914 }
1915
1916 if (ff_check_interrupt(&s->interrupt_callback)) {
1917 ret = AVERROR_EXIT;
1918 goto fail;
1919 }
1920
1921 if (!(pls->ctx = avformat_alloc_context())) {
1922 ret = AVERROR(ENOMEM);
1923 goto fail;
1924 }
1925
1926 avio_ctx_buffer = av_malloc(INITIAL_BUFFER_SIZE);
1927 if (!avio_ctx_buffer ) {
1928 ret = AVERROR(ENOMEM);
1929 avformat_free_context(pls->ctx);
1930 pls->ctx = NULL;
1931 goto fail;
1932 }
1933 if (c->is_live) {
1934 ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, NULL);
1935 } else {
1936 ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, seek_data);
1937 }
1938 pls->pb.seekable = 0;
1939
1940 if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
1941 goto fail;
1942
1943 pls->ctx->flags = AVFMT_FLAG_CUSTOM_IO;
1944 pls->ctx->probesize = s->probesize > 0 ? s->probesize : 1024 * 4;
1945 pls->ctx->max_analyze_duration = s->max_analyze_duration > 0 ? s->max_analyze_duration : 4 * AV_TIME_BASE;
1946 ret = av_probe_input_buffer(&pls->pb, &in_fmt, "", NULL, 0, 0);
1947 if (ret < 0) {
1948 av_log(s, AV_LOG_ERROR, "Error when loading first fragment, playlist %d\n", (int)pls->rep_idx);
1949 avformat_free_context(pls->ctx);
1950 pls->ctx = NULL;
1951 goto fail;
1952 }
1953
1954 pls->ctx->pb = &pls->pb;
1955 pls->ctx->io_open = nested_io_open;
1956
1957 // provide additional information from mpd if available
1958 ret = avformat_open_input(&pls->ctx, "", in_fmt, &in_fmt_opts); //pls->init_section->url
1959 av_dict_free(&in_fmt_opts);
1960 if (ret < 0)
1961 goto fail;
1962 if (pls->n_fragments) {
1963 #if FF_API_R_FRAME_RATE
1964 if (pls->framerate.den) {
1965 for (i = 0; i < pls->ctx->nb_streams; i++)
1966 pls->ctx->streams[i]->r_frame_rate = pls->framerate;
1967 }
1968 #endif
1969 ret = avformat_find_stream_info(pls->ctx, NULL);
1970 if (ret < 0)
1971 goto fail;
1972 }
1973
1974 fail:
1975 return ret;
1976 }
1977
open_demux_for_component(AVFormatContext * s,struct representation * pls)1978 static int open_demux_for_component(AVFormatContext *s, struct representation *pls)
1979 {
1980 int ret = 0;
1981 int i;
1982
1983 pls->parent = s;
1984 pls->cur_seq_no = calc_cur_seg_no(s, pls);
1985
1986 if (!pls->last_seq_no) {
1987 pls->last_seq_no = calc_max_seg_no(pls, s->priv_data);
1988 }
1989
1990 ret = reopen_demux_for_component(s, pls);
1991 if (ret < 0) {
1992 goto fail;
1993 }
1994 for (i = 0; i < pls->ctx->nb_streams; i++) {
1995 AVStream *st = avformat_new_stream(s, NULL);
1996 AVStream *ist = pls->ctx->streams[i];
1997 if (!st) {
1998 ret = AVERROR(ENOMEM);
1999 goto fail;
2000 }
2001 st->id = i;
2002 avcodec_parameters_copy(st->codecpar, ist->codecpar);
2003 avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
2004 }
2005
2006 return 0;
2007 fail:
2008 return ret;
2009 }
2010
is_common_init_section_exist(struct representation ** pls,int n_pls)2011 static int is_common_init_section_exist(struct representation **pls, int n_pls)
2012 {
2013 struct fragment *first_init_section = pls[0]->init_section;
2014 char *url =NULL;
2015 int64_t url_offset = -1;
2016 int64_t size = -1;
2017 int i = 0;
2018
2019 if (first_init_section == NULL || n_pls == 0)
2020 return 0;
2021
2022 url = first_init_section->url;
2023 url_offset = first_init_section->url_offset;
2024 size = pls[0]->init_section->size;
2025 for (i=0;i<n_pls;i++) {
2026 if (av_strcasecmp(pls[i]->init_section->url,url) || pls[i]->init_section->url_offset != url_offset || pls[i]->init_section->size != size) {
2027 return 0;
2028 }
2029 }
2030 return 1;
2031 }
2032
copy_init_section(struct representation * rep_dest,struct representation * rep_src)2033 static int copy_init_section(struct representation *rep_dest, struct representation *rep_src)
2034 {
2035 rep_dest->init_sec_buf = av_mallocz(rep_src->init_sec_buf_size);
2036 if (!rep_dest->init_sec_buf) {
2037 av_log(rep_dest->ctx, AV_LOG_WARNING, "Cannot alloc memory for init_sec_buf\n");
2038 return AVERROR(ENOMEM);
2039 }
2040 memcpy(rep_dest->init_sec_buf, rep_src->init_sec_buf, rep_src->init_sec_data_len);
2041 rep_dest->init_sec_buf_size = rep_src->init_sec_buf_size;
2042 rep_dest->init_sec_data_len = rep_src->init_sec_data_len;
2043 rep_dest->cur_timestamp = rep_src->cur_timestamp;
2044
2045 return 0;
2046 }
2047
2048
dash_read_header(AVFormatContext * s)2049 static int dash_read_header(AVFormatContext *s)
2050 {
2051 DASHContext *c = s->priv_data;
2052 struct representation *rep;
2053 int ret = 0;
2054 int stream_index = 0;
2055 int i;
2056
2057 c->interrupt_callback = &s->interrupt_callback;
2058
2059 if ((ret = save_avio_options(s)) < 0)
2060 goto fail;
2061
2062 if ((ret = parse_manifest(s, s->url, s->pb)) < 0)
2063 goto fail;
2064
2065 /* If this isn't a live stream, fill the total duration of the
2066 * stream. */
2067 if (!c->is_live) {
2068 s->duration = (int64_t) c->media_presentation_duration * AV_TIME_BASE;
2069 } else {
2070 av_dict_set(&c->avio_opts, "seekable", "0", 0);
2071 }
2072
2073 if(c->n_videos)
2074 c->is_init_section_common_video = is_common_init_section_exist(c->videos, c->n_videos);
2075
2076 /* Open the demuxer for video and audio components if available */
2077 for (i = 0; i < c->n_videos; i++) {
2078 rep = c->videos[i];
2079 if (i > 0 && c->is_init_section_common_video) {
2080 ret = copy_init_section(rep, c->videos[0]);
2081 if (ret < 0)
2082 goto fail;
2083 }
2084 ret = open_demux_for_component(s, rep);
2085
2086 if (ret)
2087 goto fail;
2088 rep->stream_index = stream_index;
2089 ++stream_index;
2090 }
2091
2092 if(c->n_audios)
2093 c->is_init_section_common_audio = is_common_init_section_exist(c->audios, c->n_audios);
2094
2095 for (i = 0; i < c->n_audios; i++) {
2096 rep = c->audios[i];
2097 if (i > 0 && c->is_init_section_common_audio) {
2098 ret = copy_init_section(rep, c->audios[0]);
2099 if (ret < 0)
2100 goto fail;
2101 }
2102 ret = open_demux_for_component(s, rep);
2103
2104 if (ret)
2105 goto fail;
2106 rep->stream_index = stream_index;
2107 ++stream_index;
2108 }
2109
2110 if (c->n_subtitles)
2111 c->is_init_section_common_audio = is_common_init_section_exist(c->subtitles, c->n_subtitles);
2112
2113 for (i = 0; i < c->n_subtitles; i++) {
2114 rep = c->subtitles[i];
2115 if (i > 0 && c->is_init_section_common_audio) {
2116 ret = copy_init_section(rep, c->subtitles[0]);
2117 if (ret < 0)
2118 goto fail;
2119 }
2120 ret = open_demux_for_component(s, rep);
2121
2122 if (ret)
2123 goto fail;
2124 rep->stream_index = stream_index;
2125 ++stream_index;
2126 }
2127
2128 if (!stream_index) {
2129 ret = AVERROR_INVALIDDATA;
2130 goto fail;
2131 }
2132
2133 /* Create a program */
2134 if (!ret) {
2135 AVProgram *program;
2136 program = av_new_program(s, 0);
2137 if (!program) {
2138 goto fail;
2139 }
2140
2141 for (i = 0; i < c->n_videos; i++) {
2142 rep = c->videos[i];
2143 av_program_add_stream_index(s, 0, rep->stream_index);
2144 rep->assoc_stream = s->streams[rep->stream_index];
2145 if (rep->bandwidth > 0)
2146 av_dict_set_int(&rep->assoc_stream->metadata, "variant_bitrate", rep->bandwidth, 0);
2147 if (rep->id[0])
2148 av_dict_set(&rep->assoc_stream->metadata, "id", rep->id, 0);
2149 }
2150 for (i = 0; i < c->n_audios; i++) {
2151 rep = c->audios[i];
2152 av_program_add_stream_index(s, 0, rep->stream_index);
2153 rep->assoc_stream = s->streams[rep->stream_index];
2154 if (rep->bandwidth > 0)
2155 av_dict_set_int(&rep->assoc_stream->metadata, "variant_bitrate", rep->bandwidth, 0);
2156 if (rep->id[0])
2157 av_dict_set(&rep->assoc_stream->metadata, "id", rep->id, 0);
2158 if (rep->lang) {
2159 av_dict_set(&rep->assoc_stream->metadata, "language", rep->lang, 0);
2160 av_freep(&rep->lang);
2161 }
2162 }
2163 for (i = 0; i < c->n_subtitles; i++) {
2164 rep = c->subtitles[i];
2165 av_program_add_stream_index(s, 0, rep->stream_index);
2166 rep->assoc_stream = s->streams[rep->stream_index];
2167 if (rep->id[0])
2168 av_dict_set(&rep->assoc_stream->metadata, "id", rep->id, 0);
2169 if (rep->lang) {
2170 av_dict_set(&rep->assoc_stream->metadata, "language", rep->lang, 0);
2171 av_freep(&rep->lang);
2172 }
2173 }
2174 }
2175
2176 return 0;
2177 fail:
2178 return ret;
2179 }
2180
recheck_discard_flags(AVFormatContext * s,struct representation ** p,int n)2181 static void recheck_discard_flags(AVFormatContext *s, struct representation **p, int n)
2182 {
2183 int i, j;
2184
2185 for (i = 0; i < n; i++) {
2186 struct representation *pls = p[i];
2187 int needed = !pls->assoc_stream || pls->assoc_stream->discard < AVDISCARD_ALL;
2188
2189 if (needed && !pls->ctx) {
2190 pls->cur_seg_offset = 0;
2191 pls->init_sec_buf_read_offset = 0;
2192 /* Catch up */
2193 for (j = 0; j < n; j++) {
2194 pls->cur_seq_no = FFMAX(pls->cur_seq_no, p[j]->cur_seq_no);
2195 }
2196 reopen_demux_for_component(s, pls);
2197 av_log(s, AV_LOG_INFO, "Now receiving stream_index %d\n", pls->stream_index);
2198 } else if (!needed && pls->ctx) {
2199 close_demux_for_component(pls);
2200 ff_format_io_close(pls->parent, &pls->input);
2201 av_log(s, AV_LOG_INFO, "No longer receiving stream_index %d\n", pls->stream_index);
2202 }
2203 }
2204 }
2205
dash_read_packet(AVFormatContext * s,AVPacket * pkt)2206 static int dash_read_packet(AVFormatContext *s, AVPacket *pkt)
2207 {
2208 DASHContext *c = s->priv_data;
2209 int ret = 0, i;
2210 int64_t mints = 0;
2211 struct representation *cur = NULL;
2212 struct representation *rep = NULL;
2213
2214 recheck_discard_flags(s, c->videos, c->n_videos);
2215 recheck_discard_flags(s, c->audios, c->n_audios);
2216 recheck_discard_flags(s, c->subtitles, c->n_subtitles);
2217
2218 for (i = 0; i < c->n_videos; i++) {
2219 rep = c->videos[i];
2220 if (!rep->ctx)
2221 continue;
2222 if (!cur || rep->cur_timestamp < mints) {
2223 cur = rep;
2224 mints = rep->cur_timestamp;
2225 }
2226 }
2227 for (i = 0; i < c->n_audios; i++) {
2228 rep = c->audios[i];
2229 if (!rep->ctx)
2230 continue;
2231 if (!cur || rep->cur_timestamp < mints) {
2232 cur = rep;
2233 mints = rep->cur_timestamp;
2234 }
2235 }
2236
2237 for (i = 0; i < c->n_subtitles; i++) {
2238 rep = c->subtitles[i];
2239 if (!rep->ctx)
2240 continue;
2241 if (!cur || rep->cur_timestamp < mints) {
2242 cur = rep;
2243 mints = rep->cur_timestamp;
2244 }
2245 }
2246
2247 if (!cur) {
2248 return AVERROR_INVALIDDATA;
2249 }
2250 while (!ff_check_interrupt(c->interrupt_callback) && !ret) {
2251 ret = av_read_frame(cur->ctx, pkt);
2252 if (ret >= 0) {
2253 /* If we got a packet, return it */
2254 cur->cur_timestamp = av_rescale(pkt->pts, (int64_t)cur->ctx->streams[0]->time_base.num * 90000, cur->ctx->streams[0]->time_base.den);
2255 pkt->stream_index = cur->stream_index;
2256 return 0;
2257 }
2258 if (cur->is_restart_needed) {
2259 cur->cur_seg_offset = 0;
2260 cur->init_sec_buf_read_offset = 0;
2261 ff_format_io_close(cur->parent, &cur->input);
2262 ret = reopen_demux_for_component(s, cur);
2263 cur->is_restart_needed = 0;
2264 }
2265 }
2266 return AVERROR_EOF;
2267 }
2268
dash_close(AVFormatContext * s)2269 static int dash_close(AVFormatContext *s)
2270 {
2271 DASHContext *c = s->priv_data;
2272 free_audio_list(c);
2273 free_video_list(c);
2274 av_dict_free(&c->avio_opts);
2275 av_freep(&c->base_url);
2276 return 0;
2277 }
2278
dash_seek(AVFormatContext * s,struct representation * pls,int64_t seek_pos_msec,int flags,int dry_run)2279 static int dash_seek(AVFormatContext *s, struct representation *pls, int64_t seek_pos_msec, int flags, int dry_run)
2280 {
2281 int ret = 0;
2282 int i = 0;
2283 int j = 0;
2284 int64_t duration = 0;
2285
2286 av_log(pls->parent, AV_LOG_VERBOSE, "DASH seek pos[%"PRId64"ms], playlist %d%s\n",
2287 seek_pos_msec, pls->rep_idx, dry_run ? " (dry)" : "");
2288
2289 // single fragment mode
2290 if (pls->n_fragments == 1) {
2291 pls->cur_timestamp = 0;
2292 pls->cur_seg_offset = 0;
2293 if (dry_run)
2294 return 0;
2295 ff_read_frame_flush(pls->ctx);
2296 return av_seek_frame(pls->ctx, -1, seek_pos_msec * 1000, flags);
2297 }
2298
2299 ff_format_io_close(pls->parent, &pls->input);
2300
2301 // find the nearest fragment
2302 if (pls->n_timelines > 0 && pls->fragment_timescale > 0) {
2303 int64_t num = pls->first_seq_no;
2304 av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline start n_timelines[%d] "
2305 "last_seq_no[%"PRId64"], playlist %d.\n",
2306 (int)pls->n_timelines, (int64_t)pls->last_seq_no, (int)pls->rep_idx);
2307 for (i = 0; i < pls->n_timelines; i++) {
2308 if (pls->timelines[i]->starttime > 0) {
2309 duration = pls->timelines[i]->starttime;
2310 }
2311 duration += pls->timelines[i]->duration;
2312 if (seek_pos_msec < ((duration * 1000) / pls->fragment_timescale)) {
2313 goto set_seq_num;
2314 }
2315 for (j = 0; j < pls->timelines[i]->repeat; j++) {
2316 duration += pls->timelines[i]->duration;
2317 num++;
2318 if (seek_pos_msec < ((duration * 1000) / pls->fragment_timescale)) {
2319 goto set_seq_num;
2320 }
2321 }
2322 num++;
2323 }
2324
2325 set_seq_num:
2326 pls->cur_seq_no = num > pls->last_seq_no ? pls->last_seq_no : num;
2327 av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline end cur_seq_no[%"PRId64"], playlist %d.\n",
2328 (int64_t)pls->cur_seq_no, (int)pls->rep_idx);
2329 } else if (pls->fragment_duration > 0) {
2330 pls->cur_seq_no = pls->first_seq_no + ((seek_pos_msec * pls->fragment_timescale) / pls->fragment_duration) / 1000;
2331 } else {
2332 av_log(pls->parent, AV_LOG_ERROR, "dash_seek missing timeline or fragment_duration\n");
2333 pls->cur_seq_no = pls->first_seq_no;
2334 }
2335 pls->cur_timestamp = 0;
2336 pls->cur_seg_offset = 0;
2337 pls->init_sec_buf_read_offset = 0;
2338 ret = dry_run ? 0 : reopen_demux_for_component(s, pls);
2339
2340 return ret;
2341 }
2342
dash_read_seek(AVFormatContext * s,int stream_index,int64_t timestamp,int flags)2343 static int dash_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
2344 {
2345 int ret = 0, i;
2346 DASHContext *c = s->priv_data;
2347 int64_t seek_pos_msec = av_rescale_rnd(timestamp, 1000,
2348 s->streams[stream_index]->time_base.den,
2349 flags & AVSEEK_FLAG_BACKWARD ?
2350 AV_ROUND_DOWN : AV_ROUND_UP);
2351 if ((flags & AVSEEK_FLAG_BYTE) || c->is_live)
2352 return AVERROR(ENOSYS);
2353
2354 /* Seek in discarded streams with dry_run=1 to avoid reopening them */
2355 for (i = 0; i < c->n_videos; i++) {
2356 if (!ret)
2357 ret = dash_seek(s, c->videos[i], seek_pos_msec, flags, !c->videos[i]->ctx);
2358 }
2359 for (i = 0; i < c->n_audios; i++) {
2360 if (!ret)
2361 ret = dash_seek(s, c->audios[i], seek_pos_msec, flags, !c->audios[i]->ctx);
2362 }
2363 for (i = 0; i < c->n_subtitles; i++) {
2364 if (!ret)
2365 ret = dash_seek(s, c->subtitles[i], seek_pos_msec, flags, !c->subtitles[i]->ctx);
2366 }
2367
2368 return ret;
2369 }
2370
dash_probe(const AVProbeData * p)2371 static int dash_probe(const AVProbeData *p)
2372 {
2373 if (!av_stristr(p->buf, "<MPD"))
2374 return 0;
2375
2376 if (av_stristr(p->buf, "dash:profile:isoff-on-demand:2011") ||
2377 av_stristr(p->buf, "dash:profile:isoff-live:2011") ||
2378 av_stristr(p->buf, "dash:profile:isoff-live:2012") ||
2379 av_stristr(p->buf, "dash:profile:isoff-main:2011") ||
2380 av_stristr(p->buf, "3GPP:PSS:profile:DASH1")) {
2381 return AVPROBE_SCORE_MAX;
2382 }
2383 if (av_stristr(p->buf, "dash:profile")) {
2384 return AVPROBE_SCORE_MAX;
2385 }
2386
2387 return 0;
2388 }
2389
2390 #define OFFSET(x) offsetof(DASHContext, x)
2391 #define FLAGS AV_OPT_FLAG_DECODING_PARAM
2392 static const AVOption dash_options[] = {
2393 {"allowed_extensions", "List of file extensions that dash is allowed to access",
2394 OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
2395 {.str = "aac,m4a,m4s,m4v,mov,mp4,webm,ts"},
2396 INT_MIN, INT_MAX, FLAGS},
2397 {NULL}
2398 };
2399
2400 static const AVClass dash_class = {
2401 .class_name = "dash",
2402 .item_name = av_default_item_name,
2403 .option = dash_options,
2404 .version = LIBAVUTIL_VERSION_INT,
2405 };
2406
2407 AVInputFormat ff_dash_demuxer = {
2408 .name = "dash",
2409 .long_name = NULL_IF_CONFIG_SMALL("Dynamic Adaptive Streaming over HTTP"),
2410 .priv_class = &dash_class,
2411 .priv_data_size = sizeof(DASHContext),
2412 .read_probe = dash_probe,
2413 .read_header = dash_read_header,
2414 .read_packet = dash_read_packet,
2415 .read_close = dash_close,
2416 .read_seek = dash_read_seek,
2417 .flags = AVFMT_NO_BYTE_SEEK,
2418 };
2419