2 * Dynamic Adaptive Streaming over HTTP demux
3 * Copyright (c) 2017 samsamsam@o2.pl based on HLS demux
4 * Copyright (c) 2017 Steven Liu
6 * This file is part of FFmpeg.
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.
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.
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
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"
28 #include "avio_internal.h"
31 #define INITIAL_BUFFER_SIZE 32768
40 * reference to : ISO_IEC_23009-1-DASH-2012
42 * Table: Table 17 — Semantics of SegmentTimeline element
45 /* starttime: Element or Attribute Name
46 * specifies the MPD start time, in @timescale units,
47 * the first Segment in the series starts relative to the beginning of the Period.
48 * The value of this attribute must be equal to or greater than the sum of the previous S
49 * element earliest presentation time and the sum of the contiguous Segment durations.
50 * If the value of the attribute is greater than what is expressed by the previous S element,
51 * it expresses discontinuities in the timeline.
52 * If not present then the value shall be assumed to be zero for the first S element
53 * and for the subsequent S elements, the value shall be assumed to be the sum of
54 * the previous S element's earliest presentation time and contiguous duration
55 * (i.e. previous S@starttime + @duration * (@repeat + 1)).
58 /* repeat: Element or Attribute Name
59 * specifies the repeat count of the number of following contiguous Segments with
60 * the same duration expressed by the value of @duration. This value is zero-based
61 * (e.g. a value of three means four Segments in the contiguous series).
64 /* duration: Element or Attribute Name
65 * specifies the Segment duration, in units of the value of the @timescale.
71 * Each playlist has its own demuxer. If it is currently active,
72 * it has an opened AVIOContext too, and potentially an AVPacket
73 * containing the next packet from this stream.
75 struct representation {
79 AVFormatContext *parent;
86 enum AVMediaType type;
90 AVStream *assoc_stream; /* demuxer stream associated with this representation */
93 struct fragment **fragments; /* VOD list of fragment for profile */
96 struct timeline **timelines;
100 int64_t start_number; /* used in case when we have dynamic list of segment to know which segments are new one*/
102 int64_t fragment_duration;
103 int64_t fragment_timescale;
105 int64_t presentation_timeoffset;
108 int64_t cur_seg_offset;
109 int64_t cur_seg_size;
110 struct fragment *cur_seg;
112 /* Currently active Media Initialization Section */
113 struct fragment *init_section;
114 uint8_t *init_sec_buf;
115 uint32_t init_sec_buf_size;
116 uint32_t init_sec_data_len;
117 uint32_t init_sec_buf_read_offset;
118 int64_t cur_timestamp;
119 int is_restart_needed;
122 typedef struct DASHContext {
123 const AVClass *class;
127 struct representation **videos;
129 struct representation **audios;
131 /* MediaPresentationDescription Attribute */
132 uint64_t media_presentation_duration;
133 uint64_t suggested_presentation_delay;
134 uint64_t availability_start_time;
135 uint64_t publish_time;
136 uint64_t minimum_update_period;
137 uint64_t time_shift_buffer_depth;
138 uint64_t min_buffer_time;
140 /* Period Attribute */
141 uint64_t period_duration;
142 uint64_t period_start;
145 AVIOInterruptCB *interrupt_callback;
146 char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context
147 char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context
148 char *headers; ///< holds HTTP headers set as an AVOption to the HTTP protocol context
149 char *allowed_extensions;
150 AVDictionary *avio_opts;
154 static int ishttp(char *url)
156 const char *proto_name = avio_find_protocol_name(url);
157 return av_strstart(proto_name, "http", NULL);
160 static int aligned(int val)
162 return ((val + 0x3F) >> 6) << 6;
165 static uint64_t get_current_time_in_sec(void)
167 return av_gettime() / 1000000;
170 static uint64_t get_utc_date_time_insec(AVFormatContext *s, const char *datetime)
181 /* ISO-8601 date parser */
185 ret = sscanf(datetime, "%d-%d-%dT%d:%d:%fZ", &year, &month, &day, &hour, &minute, &second);
186 /* year, month, day, hour, minute, second 6 arguments */
188 av_log(s, AV_LOG_WARNING, "get_utc_date_time_insec get a wrong time format\n");
190 timeinfo.tm_year = year - 1900;
191 timeinfo.tm_mon = month - 1;
192 timeinfo.tm_mday = day;
193 timeinfo.tm_hour = hour;
194 timeinfo.tm_min = minute;
195 timeinfo.tm_sec = (int)second;
197 return av_timegm(&timeinfo);
200 static uint32_t get_duration_insec(AVFormatContext *s, const char *duration)
202 /* ISO-8601 duration parser */
210 const char *ptr = duration;
213 if (*ptr == 'P' || *ptr == 'T') {
218 if (sscanf(ptr, "%f%c%n", &value, &type, &size) != 2) {
219 av_log(s, AV_LOG_WARNING, "get_duration_insec get a wrong time format\n");
220 return 0; /* parser error */
224 days = (uint32_t)value;
227 hours = (uint32_t)value;
230 mins = (uint32_t)value;
233 secs = (uint32_t)value;
236 // handle invalid type
241 return ((days * 24 + hours) * 60 + mins) * 60 + secs;
244 static int64_t get_segment_start_time_based_on_timeline(struct representation *pls, int64_t cur_seq_no)
246 int64_t start_time = 0;
251 if (pls->n_timelines) {
252 for (i = 0; i < pls->n_timelines; i++) {
253 if (pls->timelines[i]->starttime > 0) {
254 start_time = pls->timelines[i]->starttime;
256 if (num == cur_seq_no)
259 start_time += pls->timelines[i]->duration;
260 for (j = 0; j < pls->timelines[i]->repeat; j++) {
262 if (num == cur_seq_no)
264 start_time += pls->timelines[i]->duration;
273 static int64_t calc_next_seg_no_from_timelines(struct representation *pls, int64_t cur_time)
278 int64_t start_time = 0;
280 for (i = 0; i < pls->n_timelines; i++) {
281 if (pls->timelines[i]->starttime > 0) {
282 start_time = pls->timelines[i]->starttime;
284 if (start_time > cur_time)
287 start_time += pls->timelines[i]->duration;
288 for (j = 0; j < pls->timelines[i]->repeat; j++) {
290 if (start_time > cur_time)
292 start_time += pls->timelines[i]->duration;
303 static void free_fragment(struct fragment **seg)
308 av_freep(&(*seg)->url);
312 static void free_fragment_list(struct representation *pls)
316 for (i = 0; i < pls->n_fragments; i++) {
317 free_fragment(&pls->fragments[i]);
319 av_freep(&pls->fragments);
320 pls->n_fragments = 0;
323 static void free_timelines_list(struct representation *pls)
327 for (i = 0; i < pls->n_timelines; i++) {
328 av_freep(&pls->timelines[i]);
330 av_freep(&pls->timelines);
331 pls->n_timelines = 0;
334 static void free_representation(struct representation *pls)
336 free_fragment_list(pls);
337 free_timelines_list(pls);
338 free_fragment(&pls->cur_seg);
339 free_fragment(&pls->init_section);
340 av_freep(&pls->init_sec_buf);
341 av_freep(&pls->pb.buffer);
343 ff_format_io_close(pls->parent, &pls->input);
346 avformat_close_input(&pls->ctx);
349 av_freep(&pls->url_template);
353 static void free_video_list(DASHContext *c)
356 for (i = 0; i < c->n_videos; i++) {
357 struct representation *pls = c->videos[i];
358 free_representation(pls);
360 av_freep(&c->videos);
364 static void free_audio_list(DASHContext *c)
367 for (i = 0; i < c->n_audios; i++) {
368 struct representation *pls = c->audios[i];
369 free_representation(pls);
371 av_freep(&c->audios);
375 static void set_httpheader_options(DASHContext *c, AVDictionary **opts)
377 // broker prior HTTP options that should be consistent across requests
378 av_dict_set(opts, "user-agent", c->user_agent, 0);
379 av_dict_set(opts, "cookies", c->cookies, 0);
380 av_dict_set(opts, "headers", c->headers, 0);
382 av_dict_set(opts, "seekable", "0", 0);
385 static void update_options(char **dest, const char *name, void *src)
388 av_opt_get(src, name, AV_OPT_SEARCH_CHILDREN, (uint8_t**)dest);
393 static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
394 AVDictionary *opts, AVDictionary *opts2, int *is_http)
396 DASHContext *c = s->priv_data;
397 AVDictionary *tmp = NULL;
398 const char *proto_name = NULL;
401 av_dict_copy(&tmp, opts, 0);
402 av_dict_copy(&tmp, opts2, 0);
404 if (av_strstart(url, "crypto", NULL)) {
405 if (url[6] == '+' || url[6] == ':')
406 proto_name = avio_find_protocol_name(url + 7);
410 proto_name = avio_find_protocol_name(url);
413 return AVERROR_INVALIDDATA;
415 // only http(s) & file are allowed
416 if (av_strstart(proto_name, "file", NULL)) {
417 if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
418 av_log(s, AV_LOG_ERROR,
419 "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
420 "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
422 return AVERROR_INVALIDDATA;
424 } else if (av_strstart(proto_name, "http", NULL)) {
427 return AVERROR_INVALIDDATA;
429 if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
431 else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
433 else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
434 return AVERROR_INVALIDDATA;
437 ret = avio_open2(pb, url, AVIO_FLAG_READ, c->interrupt_callback, &tmp);
439 // update cookies on http response with setcookies.
440 char *new_cookies = NULL;
442 if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
443 av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);
447 c->cookies = new_cookies;
450 av_dict_set(&opts, "cookies", c->cookies, 0);
456 *is_http = av_strstart(proto_name, "http", NULL);
461 static char *get_content_url(xmlNodePtr *baseurl_nodes,
465 char *rep_bandwidth_val,
471 char *tmp_str = av_mallocz(max_url_size);
472 char *tmp_str_2 = av_mallocz(max_url_size);
474 if (!tmp_str || !tmp_str_2) {
478 for (i = 0; i < n_baseurl_nodes; ++i) {
479 if (baseurl_nodes[i] &&
480 baseurl_nodes[i]->children &&
481 baseurl_nodes[i]->children->type == XML_TEXT_NODE) {
482 text = xmlNodeGetContent(baseurl_nodes[i]->children);
484 memset(tmp_str, 0, max_url_size);
485 memset(tmp_str_2, 0, max_url_size);
486 ff_make_absolute_url(tmp_str_2, max_url_size, tmp_str, text);
487 av_strlcpy(tmp_str, tmp_str_2, max_url_size);
494 av_strlcat(tmp_str, (const char*)val, max_url_size);
497 url = av_strireplace(tmp_str, "$RepresentationID$", (const char*)rep_id_val);
501 av_strlcpy(tmp_str, url, max_url_size);
503 if (rep_bandwidth_val && tmp_str[0] != '\0') {
504 // free any previously assigned url before reassigning
506 url = av_strireplace(tmp_str, "$Bandwidth$", (const char*)rep_bandwidth_val);
517 static char *get_val_from_nodes_tab(xmlNodePtr *nodes, const int n_nodes, const char *attrname)
522 for (i = 0; i < n_nodes; ++i) {
524 val = xmlGetProp(nodes[i], attrname);
533 static xmlNodePtr find_child_node_by_name(xmlNodePtr rootnode, const char *nodename)
535 xmlNodePtr node = rootnode;
540 node = xmlFirstElementChild(node);
542 if (!av_strcasecmp(node->name, nodename)) {
545 node = xmlNextElementSibling(node);
550 static enum AVMediaType get_content_type(xmlNodePtr node)
552 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
558 for (i = 0; i < 2; i++) {
559 attr = i ? "mimeType" : "contentType";
560 val = xmlGetProp(node, attr);
562 if (av_stristr((const char *)val, "video")) {
563 type = AVMEDIA_TYPE_VIDEO;
564 } else if (av_stristr((const char *)val, "audio")) {
565 type = AVMEDIA_TYPE_AUDIO;
574 static struct fragment * get_Fragment(char *range)
576 struct fragment * seg = av_mallocz(sizeof(struct fragment));
583 char *str_end_offset;
584 char *str_offset = av_strtok(range, "-", &str_end_offset);
585 seg->url_offset = strtoll(str_offset, NULL, 10);
586 seg->size = strtoll(str_end_offset, NULL, 10) - seg->url_offset;
592 static int parse_manifest_segmenturlnode(AVFormatContext *s, struct representation *rep,
593 xmlNodePtr fragmenturl_node,
594 xmlNodePtr *baseurl_nodes,
596 char *rep_bandwidth_val)
598 DASHContext *c = s->priv_data;
599 char *initialization_val = NULL;
600 char *media_val = NULL;
601 char *range_val = NULL;
602 int max_url_size = c ? c->max_url_size: MAX_URL_SIZE;
604 if (!av_strcasecmp(fragmenturl_node->name, (const char *)"Initialization")) {
605 initialization_val = xmlGetProp(fragmenturl_node, "sourceURL");
606 range_val = xmlGetProp(fragmenturl_node, "range");
607 if (initialization_val || range_val) {
608 rep->init_section = get_Fragment(range_val);
609 if (!rep->init_section) {
610 xmlFree(initialization_val);
612 return AVERROR(ENOMEM);
614 rep->init_section->url = get_content_url(baseurl_nodes, 4,
620 if (!rep->init_section->url) {
621 av_free(rep->init_section);
622 xmlFree(initialization_val);
624 return AVERROR(ENOMEM);
626 xmlFree(initialization_val);
629 } else if (!av_strcasecmp(fragmenturl_node->name, (const char *)"SegmentURL")) {
630 media_val = xmlGetProp(fragmenturl_node, "media");
631 range_val = xmlGetProp(fragmenturl_node, "mediaRange");
632 if (media_val || range_val) {
633 struct fragment *seg = get_Fragment(range_val);
637 return AVERROR(ENOMEM);
639 seg->url = get_content_url(baseurl_nodes, 4,
648 return AVERROR(ENOMEM);
650 dynarray_add(&rep->fragments, &rep->n_fragments, seg);
659 static int parse_manifest_segmenttimeline(AVFormatContext *s, struct representation *rep,
660 xmlNodePtr fragment_timeline_node)
662 xmlAttrPtr attr = NULL;
665 if (!av_strcasecmp(fragment_timeline_node->name, (const char *)"S")) {
666 struct timeline *tml = av_mallocz(sizeof(struct timeline));
668 return AVERROR(ENOMEM);
670 attr = fragment_timeline_node->properties;
672 val = xmlGetProp(fragment_timeline_node, attr->name);
675 av_log(s, AV_LOG_WARNING, "parse_manifest_segmenttimeline attr->name = %s val is NULL\n", attr->name);
679 if (!av_strcasecmp(attr->name, (const char *)"t")) {
680 tml->starttime = (int64_t)strtoll(val, NULL, 10);
681 } else if (!av_strcasecmp(attr->name, (const char *)"r")) {
682 tml->repeat =(int64_t) strtoll(val, NULL, 10);
683 } else if (!av_strcasecmp(attr->name, (const char *)"d")) {
684 tml->duration = (int64_t)strtoll(val, NULL, 10);
689 dynarray_add(&rep->timelines, &rep->n_timelines, tml);
695 static int resolve_content_path(AVFormatContext *s, const char *url, int *max_url_size, xmlNodePtr *baseurl_nodes, int n_baseurl_nodes) {
697 char *tmp_str = NULL;
699 char *mpdName = NULL;
700 xmlNodePtr node = NULL;
701 char *baseurl = NULL;
702 char *root_url = NULL;
712 int tmp_max_url_size = strlen(url);
714 for (i = n_baseurl_nodes-1; i >= 0 ; i--) {
715 text = xmlNodeGetContent(baseurl_nodes[i]);
718 tmp_max_url_size += strlen(text);
726 tmp_max_url_size = aligned(tmp_max_url_size);
727 text = av_mallocz(tmp_max_url_size);
729 updated = AVERROR(ENOMEM);
732 av_strlcpy(text, url, strlen(url)+1);
733 while (mpdName = av_strtok(text, "/", &text)) {
734 size = strlen(mpdName);
737 path = av_mallocz(tmp_max_url_size);
738 tmp_str = av_mallocz(tmp_max_url_size);
739 if (!tmp_str || !path) {
740 updated = AVERROR(ENOMEM);
744 av_strlcpy (path, url, strlen(url) - size + 1);
745 for (rootId = n_baseurl_nodes - 1; rootId > 0; rootId --) {
746 if (!(node = baseurl_nodes[rootId])) {
749 if (ishttp(xmlNodeGetContent(node))) {
754 node = baseurl_nodes[rootId];
755 baseurl = xmlNodeGetContent(node);
756 root_url = (av_strcasecmp(baseurl, "")) ? baseurl : path;
758 xmlNodeSetContent(node, root_url);
762 size = strlen(root_url);
763 isRootHttp = ishttp(root_url);
765 if (root_url[size - 1] != token) {
766 av_strlcat(root_url, "/", size + 2);
770 for (i = 0; i < n_baseurl_nodes; ++i) {
774 text = xmlNodeGetContent(baseurl_nodes[i]);
776 memset(tmp_str, 0, strlen(tmp_str));
777 if (!ishttp(text) && isRootHttp) {
778 av_strlcpy(tmp_str, root_url, size + 1);
780 start = (text[0] == token);
781 av_strlcat(tmp_str, text + start, tmp_max_url_size);
782 xmlNodeSetContent(baseurl_nodes[i], tmp_str);
789 if (tmp_max_url_size > *max_url_size) {
790 *max_url_size = tmp_max_url_size;
798 static int parse_manifest_representation(AVFormatContext *s, const char *url,
800 xmlNodePtr adaptionset_node,
801 xmlNodePtr mpd_baseurl_node,
802 xmlNodePtr period_baseurl_node,
803 xmlNodePtr period_segmenttemplate_node,
804 xmlNodePtr period_segmentlist_node,
805 xmlNodePtr fragment_template_node,
806 xmlNodePtr content_component_node,
807 xmlNodePtr adaptionset_baseurl_node,
808 xmlNodePtr adaptionset_segmentlist_node)
811 int32_t audio_rep_idx = 0;
812 int32_t video_rep_idx = 0;
813 DASHContext *c = s->priv_data;
814 struct representation *rep = NULL;
815 struct fragment *seg = NULL;
816 xmlNodePtr representation_segmenttemplate_node = NULL;
817 xmlNodePtr representation_baseurl_node = NULL;
818 xmlNodePtr representation_segmentlist_node = NULL;
819 xmlNodePtr segmentlists_tab[2];
820 xmlNodePtr fragment_timeline_node = NULL;
821 xmlNodePtr fragment_templates_tab[5];
822 char *duration_val = NULL;
823 char *presentation_timeoffset_val = NULL;
824 char *startnumber_val = NULL;
825 char *timescale_val = NULL;
826 char *initialization_val = NULL;
827 char *media_val = NULL;
828 xmlNodePtr baseurl_nodes[4];
829 xmlNodePtr representation_node = node;
830 char *rep_id_val = xmlGetProp(representation_node, "id");
831 char *rep_bandwidth_val = xmlGetProp(representation_node, "bandwidth");
832 char *rep_framerate_val = xmlGetProp(representation_node, "frameRate");
833 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
835 // try get information from representation
836 if (type == AVMEDIA_TYPE_UNKNOWN)
837 type = get_content_type(representation_node);
838 // try get information from contentComponen
839 if (type == AVMEDIA_TYPE_UNKNOWN)
840 type = get_content_type(content_component_node);
841 // try get information from adaption set
842 if (type == AVMEDIA_TYPE_UNKNOWN)
843 type = get_content_type(adaptionset_node);
844 if (type == AVMEDIA_TYPE_UNKNOWN) {
845 av_log(s, AV_LOG_VERBOSE, "Parsing '%s' - skipp not supported representation type\n", url);
846 } else if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO) {
847 // convert selected representation to our internal struct
848 rep = av_mallocz(sizeof(struct representation));
850 ret = AVERROR(ENOMEM);
853 representation_segmenttemplate_node = find_child_node_by_name(representation_node, "SegmentTemplate");
854 representation_baseurl_node = find_child_node_by_name(representation_node, "BaseURL");
855 representation_segmentlist_node = find_child_node_by_name(representation_node, "SegmentList");
857 baseurl_nodes[0] = mpd_baseurl_node;
858 baseurl_nodes[1] = period_baseurl_node;
859 baseurl_nodes[2] = adaptionset_baseurl_node;
860 baseurl_nodes[3] = representation_baseurl_node;
862 ret = resolve_content_path(s, url, &c->max_url_size, baseurl_nodes, 4);
863 c->max_url_size = aligned(c->max_url_size + strlen(rep_id_val) + strlen(rep_bandwidth_val));
864 if (ret == AVERROR(ENOMEM) || ret == 0) {
867 if (representation_segmenttemplate_node || fragment_template_node || period_segmenttemplate_node) {
868 fragment_timeline_node = NULL;
869 fragment_templates_tab[0] = representation_segmenttemplate_node;
870 fragment_templates_tab[1] = adaptionset_segmentlist_node;
871 fragment_templates_tab[2] = fragment_template_node;
872 fragment_templates_tab[3] = period_segmenttemplate_node;
873 fragment_templates_tab[4] = period_segmentlist_node;
875 presentation_timeoffset_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "presentationTimeOffset");
876 duration_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "duration");
877 startnumber_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "startNumber");
878 timescale_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "timescale");
879 initialization_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "initialization");
880 media_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "media");
882 if (initialization_val) {
883 rep->init_section = av_mallocz(sizeof(struct fragment));
884 if (!rep->init_section) {
886 ret = AVERROR(ENOMEM);
889 c->max_url_size = aligned(c->max_url_size + strlen(initialization_val));
890 rep->init_section->url = get_content_url(baseurl_nodes, 4, c->max_url_size, rep_id_val, rep_bandwidth_val, initialization_val);
891 if (!rep->init_section->url) {
892 av_free(rep->init_section);
894 ret = AVERROR(ENOMEM);
897 rep->init_section->size = -1;
898 xmlFree(initialization_val);
902 c->max_url_size = aligned(c->max_url_size + strlen(media_val));
903 rep->url_template = get_content_url(baseurl_nodes, 4, c->max_url_size, rep_id_val, rep_bandwidth_val, media_val);
907 if (presentation_timeoffset_val) {
908 rep->presentation_timeoffset = (int64_t) strtoll(presentation_timeoffset_val, NULL, 10);
909 xmlFree(presentation_timeoffset_val);
912 rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10);
913 xmlFree(duration_val);
916 rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10);
917 xmlFree(timescale_val);
919 if (startnumber_val) {
920 rep->first_seq_no = (int64_t) strtoll(startnumber_val, NULL, 10);
921 xmlFree(startnumber_val);
924 fragment_timeline_node = find_child_node_by_name(representation_segmenttemplate_node, "SegmentTimeline");
926 if (!fragment_timeline_node)
927 fragment_timeline_node = find_child_node_by_name(fragment_template_node, "SegmentTimeline");
928 if (!fragment_timeline_node)
929 fragment_timeline_node = find_child_node_by_name(adaptionset_segmentlist_node, "SegmentTimeline");
930 if (!fragment_timeline_node)
931 fragment_timeline_node = find_child_node_by_name(period_segmentlist_node, "SegmentTimeline");
932 if (fragment_timeline_node) {
933 fragment_timeline_node = xmlFirstElementChild(fragment_timeline_node);
934 while (fragment_timeline_node) {
935 ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node);
939 fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node);
942 } else if (representation_baseurl_node && !representation_segmentlist_node) {
943 seg = av_mallocz(sizeof(struct fragment));
945 ret = AVERROR(ENOMEM);
948 seg->url = get_content_url(baseurl_nodes, 4, c->max_url_size, rep_id_val, rep_bandwidth_val, NULL);
951 ret = AVERROR(ENOMEM);
955 dynarray_add(&rep->fragments, &rep->n_fragments, seg);
956 } else if (representation_segmentlist_node) {
957 // TODO: https://www.brendanlong.com/the-structure-of-an-mpeg-dash-mpd.html
958 // http://www-itec.uni-klu.ac.at/dash/ddash/mpdGenerator.php?fragmentlength=15&type=full
959 xmlNodePtr fragmenturl_node = NULL;
960 segmentlists_tab[0] = representation_segmentlist_node;
961 segmentlists_tab[1] = adaptionset_segmentlist_node;
963 duration_val = get_val_from_nodes_tab(segmentlists_tab, 2, "duration");
964 timescale_val = get_val_from_nodes_tab(segmentlists_tab, 2, "timescale");
966 rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10);
967 xmlFree(duration_val);
970 rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10);
971 xmlFree(timescale_val);
973 fragmenturl_node = xmlFirstElementChild(representation_segmentlist_node);
974 while (fragmenturl_node) {
975 ret = parse_manifest_segmenturlnode(s, rep, fragmenturl_node,
982 fragmenturl_node = xmlNextElementSibling(fragmenturl_node);
985 fragment_timeline_node = find_child_node_by_name(representation_segmenttemplate_node, "SegmentTimeline");
987 if (!fragment_timeline_node)
988 fragment_timeline_node = find_child_node_by_name(fragment_template_node, "SegmentTimeline");
989 if (!fragment_timeline_node)
990 fragment_timeline_node = find_child_node_by_name(adaptionset_segmentlist_node, "SegmentTimeline");
991 if (!fragment_timeline_node)
992 fragment_timeline_node = find_child_node_by_name(period_segmentlist_node, "SegmentTimeline");
993 if (fragment_timeline_node) {
994 fragment_timeline_node = xmlFirstElementChild(fragment_timeline_node);
995 while (fragment_timeline_node) {
996 ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node);
1000 fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node);
1004 free_representation(rep);
1006 av_log(s, AV_LOG_ERROR, "Unknown format of Representation node id[%s] \n", (const char *)rep_id_val);
1010 if (rep->fragment_duration > 0 && !rep->fragment_timescale)
1011 rep->fragment_timescale = 1;
1012 rep->bandwidth = rep_bandwidth_val ? atoi(rep_bandwidth_val) : 0;
1013 strncpy(rep->id, rep_id_val ? rep_id_val : "", sizeof(rep->id));
1014 rep->framerate = av_make_q(0, 0);
1015 if (type == AVMEDIA_TYPE_VIDEO && rep_framerate_val) {
1016 ret = av_parse_video_rate(&rep->framerate, rep_framerate_val);
1018 av_log(s, AV_LOG_VERBOSE, "Ignoring invalid frame rate '%s'\n", rep_framerate_val);
1021 if (type == AVMEDIA_TYPE_VIDEO) {
1022 rep->rep_idx = video_rep_idx;
1023 dynarray_add(&c->videos, &c->n_videos, rep);
1025 rep->rep_idx = audio_rep_idx;
1026 dynarray_add(&c->audios, &c->n_audios, rep);
1031 video_rep_idx += type == AVMEDIA_TYPE_VIDEO;
1032 audio_rep_idx += type == AVMEDIA_TYPE_AUDIO;
1036 xmlFree(rep_id_val);
1037 if (rep_bandwidth_val)
1038 xmlFree(rep_bandwidth_val);
1039 if (rep_framerate_val)
1040 xmlFree(rep_framerate_val);
1045 static int parse_manifest_adaptationset(AVFormatContext *s, const char *url,
1046 xmlNodePtr adaptionset_node,
1047 xmlNodePtr mpd_baseurl_node,
1048 xmlNodePtr period_baseurl_node,
1049 xmlNodePtr period_segmenttemplate_node,
1050 xmlNodePtr period_segmentlist_node)
1053 xmlNodePtr fragment_template_node = NULL;
1054 xmlNodePtr content_component_node = NULL;
1055 xmlNodePtr adaptionset_baseurl_node = NULL;
1056 xmlNodePtr adaptionset_segmentlist_node = NULL;
1057 xmlNodePtr node = NULL;
1059 node = xmlFirstElementChild(adaptionset_node);
1061 if (!av_strcasecmp(node->name, (const char *)"SegmentTemplate")) {
1062 fragment_template_node = node;
1063 } else if (!av_strcasecmp(node->name, (const char *)"ContentComponent")) {
1064 content_component_node = node;
1065 } else if (!av_strcasecmp(node->name, (const char *)"BaseURL")) {
1066 adaptionset_baseurl_node = node;
1067 } else if (!av_strcasecmp(node->name, (const char *)"SegmentList")) {
1068 adaptionset_segmentlist_node = node;
1069 } else if (!av_strcasecmp(node->name, (const char *)"Representation")) {
1070 ret = parse_manifest_representation(s, url, node,
1073 period_baseurl_node,
1074 period_segmenttemplate_node,
1075 period_segmentlist_node,
1076 fragment_template_node,
1077 content_component_node,
1078 adaptionset_baseurl_node,
1079 adaptionset_segmentlist_node);
1084 node = xmlNextElementSibling(node);
1089 static int parse_manifest(AVFormatContext *s, const char *url, AVIOContext *in)
1091 DASHContext *c = s->priv_data;
1094 uint8_t *new_url = NULL;
1095 int64_t filesize = 0;
1096 char *buffer = NULL;
1097 AVDictionary *opts = NULL;
1099 xmlNodePtr root_element = NULL;
1100 xmlNodePtr node = NULL;
1101 xmlNodePtr period_node = NULL;
1102 xmlNodePtr mpd_baseurl_node = NULL;
1103 xmlNodePtr period_baseurl_node = NULL;
1104 xmlNodePtr period_segmenttemplate_node = NULL;
1105 xmlNodePtr period_segmentlist_node = NULL;
1106 xmlNodePtr adaptionset_node = NULL;
1107 xmlAttrPtr attr = NULL;
1109 uint32_t perdiod_duration_sec = 0;
1110 uint32_t perdiod_start_sec = 0;
1115 set_httpheader_options(c, &opts);
1116 ret = avio_open2(&in, url, AVIO_FLAG_READ, c->interrupt_callback, &opts);
1117 av_dict_free(&opts);
1122 if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0) {
1123 c->base_url = av_strdup(new_url);
1125 c->base_url = av_strdup(url);
1128 filesize = avio_size(in);
1129 if (filesize <= 0) {
1130 filesize = 8 * 1024;
1133 buffer = av_mallocz(filesize);
1135 av_free(c->base_url);
1136 return AVERROR(ENOMEM);
1139 filesize = avio_read(in, buffer, filesize);
1140 if (filesize <= 0) {
1141 av_log(s, AV_LOG_ERROR, "Unable to read to offset '%s'\n", url);
1142 ret = AVERROR_INVALIDDATA;
1146 doc = xmlReadMemory(buffer, filesize, c->base_url, NULL, 0);
1147 root_element = xmlDocGetRootElement(doc);
1148 node = root_element;
1151 ret = AVERROR_INVALIDDATA;
1152 av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing root node\n", url);
1156 if (node->type != XML_ELEMENT_NODE ||
1157 av_strcasecmp(node->name, (const char *)"MPD")) {
1158 ret = AVERROR_INVALIDDATA;
1159 av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - wrong root node name[%s] type[%d]\n", url, node->name, (int)node->type);
1163 val = xmlGetProp(node, "type");
1165 av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing type attrib\n", url);
1166 ret = AVERROR_INVALIDDATA;
1169 if (!av_strcasecmp(val, (const char *)"dynamic"))
1173 attr = node->properties;
1175 val = xmlGetProp(node, attr->name);
1177 if (!av_strcasecmp(attr->name, (const char *)"availabilityStartTime")) {
1178 c->availability_start_time = get_utc_date_time_insec(s, (const char *)val);
1179 } else if (!av_strcasecmp(attr->name, (const char *)"publishTime")) {
1180 c->publish_time = get_utc_date_time_insec(s, (const char *)val);
1181 } else if (!av_strcasecmp(attr->name, (const char *)"minimumUpdatePeriod")) {
1182 c->minimum_update_period = get_duration_insec(s, (const char *)val);
1183 } else if (!av_strcasecmp(attr->name, (const char *)"timeShiftBufferDepth")) {
1184 c->time_shift_buffer_depth = get_duration_insec(s, (const char *)val);
1185 } else if (!av_strcasecmp(attr->name, (const char *)"minBufferTime")) {
1186 c->min_buffer_time = get_duration_insec(s, (const char *)val);
1187 } else if (!av_strcasecmp(attr->name, (const char *)"suggestedPresentationDelay")) {
1188 c->suggested_presentation_delay = get_duration_insec(s, (const char *)val);
1189 } else if (!av_strcasecmp(attr->name, (const char *)"mediaPresentationDuration")) {
1190 c->media_presentation_duration = get_duration_insec(s, (const char *)val);
1196 mpd_baseurl_node = find_child_node_by_name(node, "BaseURL");
1197 if (!mpd_baseurl_node) {
1198 mpd_baseurl_node = xmlNewNode(NULL, "BaseURL");
1201 // at now we can handle only one period, with the longest duration
1202 node = xmlFirstElementChild(node);
1204 if (!av_strcasecmp(node->name, (const char *)"Period")) {
1205 perdiod_duration_sec = 0;
1206 perdiod_start_sec = 0;
1207 attr = node->properties;
1209 val = xmlGetProp(node, attr->name);
1210 if (!av_strcasecmp(attr->name, (const char *)"duration")) {
1211 perdiod_duration_sec = get_duration_insec(s, (const char *)val);
1212 } else if (!av_strcasecmp(attr->name, (const char *)"start")) {
1213 perdiod_start_sec = get_duration_insec(s, (const char *)val);
1218 if ((perdiod_duration_sec) >= (c->period_duration)) {
1220 c->period_duration = perdiod_duration_sec;
1221 c->period_start = perdiod_start_sec;
1222 if (c->period_start > 0)
1223 c->media_presentation_duration = c->period_duration;
1226 node = xmlNextElementSibling(node);
1229 av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing Period node\n", url);
1230 ret = AVERROR_INVALIDDATA;
1234 adaptionset_node = xmlFirstElementChild(period_node);
1235 while (adaptionset_node) {
1236 if (!av_strcasecmp(adaptionset_node->name, (const char *)"BaseURL")) {
1237 period_baseurl_node = adaptionset_node;
1238 } else if (!av_strcasecmp(adaptionset_node->name, (const char *)"SegmentTemplate")) {
1239 period_segmenttemplate_node = adaptionset_node;
1240 } else if (!av_strcasecmp(adaptionset_node->name, (const char *)"SegmentList")) {
1241 period_segmentlist_node = adaptionset_node;
1242 } else if (!av_strcasecmp(adaptionset_node->name, (const char *)"AdaptationSet")) {
1243 parse_manifest_adaptationset(s, url, adaptionset_node, mpd_baseurl_node, period_baseurl_node, period_segmenttemplate_node, period_segmentlist_node);
1245 adaptionset_node = xmlNextElementSibling(adaptionset_node);
1248 /*free the document */
1261 static int64_t calc_cur_seg_no(AVFormatContext *s, struct representation *pls)
1263 DASHContext *c = s->priv_data;
1265 int64_t start_time_offset = 0;
1268 if (pls->n_fragments) {
1269 num = pls->first_seq_no;
1270 } else if (pls->n_timelines) {
1271 start_time_offset = get_segment_start_time_based_on_timeline(pls, 0xFFFFFFFF) - 60 * pls->fragment_timescale; // 60 seconds before end
1272 num = calc_next_seg_no_from_timelines(pls, start_time_offset);
1274 num = pls->first_seq_no;
1276 num += pls->first_seq_no;
1277 } else if (pls->fragment_duration){
1278 if (pls->presentation_timeoffset) {
1279 num = pls->presentation_timeoffset * pls->fragment_timescale / pls->fragment_duration;
1280 } else if (c->publish_time > 0 && !c->availability_start_time) {
1281 num = pls->first_seq_no + (((c->publish_time - c->availability_start_time) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration;
1283 num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration;
1287 num = pls->first_seq_no;
1292 static int64_t calc_min_seg_no(AVFormatContext *s, struct representation *pls)
1294 DASHContext *c = s->priv_data;
1297 if (c->is_live && pls->fragment_duration) {
1298 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;
1300 num = pls->first_seq_no;
1305 static int64_t calc_max_seg_no(struct representation *pls, DASHContext *c)
1309 if (pls->n_fragments) {
1310 num = pls->first_seq_no + pls->n_fragments - 1;
1311 } else if (pls->n_timelines) {
1313 num = pls->first_seq_no + pls->n_timelines - 1;
1314 for (i = 0; i < pls->n_timelines; i++) {
1315 num += pls->timelines[i]->repeat;
1317 } else if (c->is_live && pls->fragment_duration) {
1318 num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time)) * pls->fragment_timescale) / pls->fragment_duration;
1319 } else if (pls->fragment_duration) {
1320 num = pls->first_seq_no + (c->media_presentation_duration * pls->fragment_timescale) / pls->fragment_duration;
1326 static void move_timelines(struct representation *rep_src, struct representation *rep_dest, DASHContext *c)
1328 if (rep_dest && rep_src ) {
1329 free_timelines_list(rep_dest);
1330 rep_dest->timelines = rep_src->timelines;
1331 rep_dest->n_timelines = rep_src->n_timelines;
1332 rep_dest->first_seq_no = rep_src->first_seq_no;
1333 rep_dest->last_seq_no = calc_max_seg_no(rep_dest, c);
1334 rep_src->timelines = NULL;
1335 rep_src->n_timelines = 0;
1336 rep_dest->cur_seq_no = rep_src->cur_seq_no;
1340 static void move_segments(struct representation *rep_src, struct representation *rep_dest, DASHContext *c)
1342 if (rep_dest && rep_src ) {
1343 free_fragment_list(rep_dest);
1344 if (rep_src->start_number > (rep_dest->start_number + rep_dest->n_fragments))
1345 rep_dest->cur_seq_no = 0;
1347 rep_dest->cur_seq_no += rep_src->start_number - rep_dest->start_number;
1348 rep_dest->fragments = rep_src->fragments;
1349 rep_dest->n_fragments = rep_src->n_fragments;
1350 rep_dest->parent = rep_src->parent;
1351 rep_dest->last_seq_no = calc_max_seg_no(rep_dest, c);
1352 rep_src->fragments = NULL;
1353 rep_src->n_fragments = 0;
1358 static int refresh_manifest(AVFormatContext *s)
1362 DASHContext *c = s->priv_data;
1364 // save current context
1365 int n_videos = c->n_videos;
1366 struct representation **videos = c->videos;
1367 int n_audios = c->n_audios;
1368 struct representation **audios = c->audios;
1369 char *base_url = c->base_url;
1376 ret = parse_manifest(s, s->filename, NULL);
1380 if (c->n_videos != n_videos) {
1381 av_log(c, AV_LOG_ERROR,
1382 "new manifest has mismatched no. of video representations, %d -> %d\n",
1383 n_videos, c->n_videos);
1384 return AVERROR_INVALIDDATA;
1386 if (c->n_audios != n_audios) {
1387 av_log(c, AV_LOG_ERROR,
1388 "new manifest has mismatched no. of audio representations, %d -> %d\n",
1389 n_audios, c->n_audios);
1390 return AVERROR_INVALIDDATA;
1393 for (i = 0; i < n_videos; i++) {
1394 struct representation *cur_video = videos[i];
1395 struct representation *ccur_video = c->videos[i];
1396 if (cur_video->timelines) {
1397 // calc current time
1398 int64_t currentTime = get_segment_start_time_based_on_timeline(cur_video, cur_video->cur_seq_no) / cur_video->fragment_timescale;
1400 ccur_video->cur_seq_no = calc_next_seg_no_from_timelines(ccur_video, currentTime * cur_video->fragment_timescale - 1);
1401 if (ccur_video->cur_seq_no >= 0) {
1402 move_timelines(ccur_video, cur_video, c);
1405 if (cur_video->fragments) {
1406 move_segments(ccur_video, cur_video, c);
1409 for (i = 0; i < n_audios; i++) {
1410 struct representation *cur_audio = audios[i];
1411 struct representation *ccur_audio = c->audios[i];
1412 if (cur_audio->timelines) {
1413 // calc current time
1414 int64_t currentTime = get_segment_start_time_based_on_timeline(cur_audio, cur_audio->cur_seq_no) / cur_audio->fragment_timescale;
1416 ccur_audio->cur_seq_no = calc_next_seg_no_from_timelines(ccur_audio, currentTime * cur_audio->fragment_timescale - 1);
1417 if (ccur_audio->cur_seq_no >= 0) {
1418 move_timelines(ccur_audio, cur_audio, c);
1421 if (cur_audio->fragments) {
1422 move_segments(ccur_audio, cur_audio, c);
1431 c->base_url = base_url;
1436 c->n_audios = n_audios;
1438 c->n_videos = n_videos;
1443 static struct fragment *get_current_fragment(struct representation *pls)
1445 int64_t min_seq_no = 0;
1446 int64_t max_seq_no = 0;
1447 struct fragment *seg = NULL;
1448 struct fragment *seg_ptr = NULL;
1449 DASHContext *c = pls->parent->priv_data;
1451 while (( !ff_check_interrupt(c->interrupt_callback)&& pls->n_fragments > 0)) {
1452 if (pls->cur_seq_no < pls->n_fragments) {
1453 seg_ptr = pls->fragments[pls->cur_seq_no];
1454 seg = av_mallocz(sizeof(struct fragment));
1458 seg->url = av_strdup(seg_ptr->url);
1463 seg->size = seg_ptr->size;
1464 seg->url_offset = seg_ptr->url_offset;
1466 } else if (c->is_live) {
1467 refresh_manifest(pls->parent);
1473 min_seq_no = calc_min_seg_no(pls->parent, pls);
1474 max_seq_no = calc_max_seg_no(pls, c);
1476 if (pls->timelines || pls->fragments) {
1477 refresh_manifest(pls->parent);
1479 if (pls->cur_seq_no <= min_seq_no) {
1480 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);
1481 pls->cur_seq_no = calc_cur_seg_no(pls->parent, pls);
1482 } else if (pls->cur_seq_no > max_seq_no) {
1483 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);
1485 seg = av_mallocz(sizeof(struct fragment));
1489 } else if (pls->cur_seq_no <= pls->last_seq_no) {
1490 seg = av_mallocz(sizeof(struct fragment));
1496 char *tmpfilename= av_mallocz(c->max_url_size);
1500 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));
1501 seg->url = av_strireplace(pls->url_template, pls->url_template, tmpfilename);
1503 av_log(pls->parent, AV_LOG_WARNING, "Unable to resolve template url '%s', try to use origin template\n", pls->url_template);
1504 seg->url = av_strdup(pls->url_template);
1506 av_log(pls->parent, AV_LOG_ERROR, "Cannot resolve template url '%s'\n", pls->url_template);
1507 av_free(tmpfilename);
1511 av_free(tmpfilename);
1518 enum ReadFromURLMode {
1523 static int read_from_url(struct representation *pls, struct fragment *seg,
1524 uint8_t *buf, int buf_size,
1525 enum ReadFromURLMode mode)
1529 /* limit read if the fragment was only a part of a file */
1531 buf_size = FFMIN(buf_size, pls->cur_seg_size - pls->cur_seg_offset);
1533 if (mode == READ_COMPLETE) {
1534 ret = avio_read(pls->input, buf, buf_size);
1535 if (ret < buf_size) {
1536 av_log(pls->parent, AV_LOG_WARNING, "Could not read complete fragment.\n");
1539 ret = avio_read(pls->input, buf, buf_size);
1542 pls->cur_seg_offset += ret;
1547 static int open_input(DASHContext *c, struct representation *pls, struct fragment *seg)
1549 AVDictionary *opts = NULL;
1553 url = av_mallocz(c->max_url_size);
1557 set_httpheader_options(c, &opts);
1558 if (seg->size >= 0) {
1559 /* try to restrict the HTTP request to the part we want
1560 * (if this is in fact a HTTP request) */
1561 av_dict_set_int(&opts, "offset", seg->url_offset, 0);
1562 av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
1565 ff_make_absolute_url(url, c->max_url_size, c->base_url, seg->url);
1566 av_log(pls->parent, AV_LOG_VERBOSE, "DASH request for url '%s', offset %"PRId64", playlist %d\n",
1567 url, seg->url_offset, pls->rep_idx);
1568 ret = open_url(pls->parent, &pls->input, url, c->avio_opts, opts, NULL);
1575 av_dict_free(&opts);
1576 pls->cur_seg_offset = 0;
1577 pls->cur_seg_size = seg->size;
1581 static int update_init_section(struct representation *pls)
1583 static const int max_init_section_size = 1024 * 1024;
1584 DASHContext *c = pls->parent->priv_data;
1589 if (!pls->init_section || pls->init_sec_buf)
1592 ret = open_input(c, pls, pls->init_section);
1594 av_log(pls->parent, AV_LOG_WARNING,
1595 "Failed to open an initialization section in playlist %d\n",
1600 if (pls->init_section->size >= 0)
1601 sec_size = pls->init_section->size;
1602 else if ((urlsize = avio_size(pls->input)) >= 0)
1605 sec_size = max_init_section_size;
1607 av_log(pls->parent, AV_LOG_DEBUG,
1608 "Downloading an initialization section of size %"PRId64"\n",
1611 sec_size = FFMIN(sec_size, max_init_section_size);
1613 av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
1615 ret = read_from_url(pls, pls->init_section, pls->init_sec_buf,
1616 pls->init_sec_buf_size, READ_COMPLETE);
1617 ff_format_io_close(pls->parent, &pls->input);
1622 pls->init_sec_data_len = ret;
1623 pls->init_sec_buf_read_offset = 0;
1628 static int64_t seek_data(void *opaque, int64_t offset, int whence)
1630 struct representation *v = opaque;
1631 if (v->n_fragments && !v->init_sec_data_len) {
1632 return avio_seek(v->input, offset, whence);
1635 return AVERROR(ENOSYS);
1638 static int read_data(void *opaque, uint8_t *buf, int buf_size)
1641 struct representation *v = opaque;
1642 DASHContext *c = v->parent->priv_data;
1646 free_fragment(&v->cur_seg);
1647 v->cur_seg = get_current_fragment(v);
1653 /* load/update Media Initialization Section, if any */
1654 ret = update_init_section(v);
1658 ret = open_input(c, v, v->cur_seg);
1660 if (ff_check_interrupt(c->interrupt_callback)) {
1664 av_log(v->parent, AV_LOG_WARNING, "Failed to open fragment of playlist %d\n", v->rep_idx);
1670 if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
1671 /* Push init section out first before first actual fragment */
1672 int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
1673 memcpy(buf, v->init_sec_buf, copy_size);
1674 v->init_sec_buf_read_offset += copy_size;
1679 /* check the v->cur_seg, if it is null, get current and double check if the new v->cur_seg*/
1681 v->cur_seg = get_current_fragment(v);
1687 ret = read_from_url(v, v->cur_seg, buf, buf_size, READ_NORMAL);
1691 if (c->is_live || v->cur_seq_no < v->last_seq_no) {
1692 if (!v->is_restart_needed)
1694 v->is_restart_needed = 1;
1701 static int save_avio_options(AVFormatContext *s)
1703 DASHContext *c = s->priv_data;
1704 const char *opts[] = { "headers", "user_agent", "user-agent", "cookies", NULL }, **opt = opts;
1705 uint8_t *buf = NULL;
1709 if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN, &buf) >= 0) {
1710 if (buf[0] != '\0') {
1711 ret = av_dict_set(&c->avio_opts, *opt, buf, AV_DICT_DONT_STRDUP_VAL);
1726 static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
1727 int flags, AVDictionary **opts)
1729 av_log(s, AV_LOG_ERROR,
1730 "A DASH playlist item '%s' referred to an external file '%s'. "
1731 "Opening this file was forbidden for security reasons\n",
1733 return AVERROR(EPERM);
1736 static void close_demux_for_component(struct representation *pls)
1738 /* note: the internal buffer could have changed */
1739 av_freep(&pls->pb.buffer);
1740 memset(&pls->pb, 0x00, sizeof(AVIOContext));
1741 pls->ctx->pb = NULL;
1742 avformat_close_input(&pls->ctx);
1746 static int reopen_demux_for_component(AVFormatContext *s, struct representation *pls)
1748 DASHContext *c = s->priv_data;
1749 AVInputFormat *in_fmt = NULL;
1750 AVDictionary *in_fmt_opts = NULL;
1751 uint8_t *avio_ctx_buffer = NULL;
1755 close_demux_for_component(pls);
1757 if (!(pls->ctx = avformat_alloc_context())) {
1758 ret = AVERROR(ENOMEM);
1762 avio_ctx_buffer = av_malloc(INITIAL_BUFFER_SIZE);
1763 if (!avio_ctx_buffer ) {
1764 ret = AVERROR(ENOMEM);
1765 avformat_free_context(pls->ctx);
1770 ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, NULL);
1772 ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, seek_data);
1774 pls->pb.seekable = 0;
1776 if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
1779 pls->ctx->flags = AVFMT_FLAG_CUSTOM_IO;
1780 pls->ctx->probesize = 1024 * 4;
1781 pls->ctx->max_analyze_duration = 4 * AV_TIME_BASE;
1782 ret = av_probe_input_buffer(&pls->pb, &in_fmt, "", NULL, 0, 0);
1784 av_log(s, AV_LOG_ERROR, "Error when loading first fragment, playlist %d\n", (int)pls->rep_idx);
1785 avformat_free_context(pls->ctx);
1790 pls->ctx->pb = &pls->pb;
1791 pls->ctx->io_open = nested_io_open;
1793 // provide additional information from mpd if available
1794 ret = avformat_open_input(&pls->ctx, "", in_fmt, &in_fmt_opts); //pls->init_section->url
1795 av_dict_free(&in_fmt_opts);
1798 if (pls->n_fragments) {
1799 #if FF_API_R_FRAME_RATE
1800 if (pls->framerate.den) {
1801 for (i = 0; i < pls->ctx->nb_streams; i++)
1802 pls->ctx->streams[i]->r_frame_rate = pls->framerate;
1806 ret = avformat_find_stream_info(pls->ctx, NULL);
1815 static int open_demux_for_component(AVFormatContext *s, struct representation *pls)
1821 pls->cur_seq_no = calc_cur_seg_no(s, pls);
1822 pls->last_seq_no = calc_max_seg_no(pls, s->priv_data);
1824 ret = reopen_demux_for_component(s, pls);
1828 for (i = 0; i < pls->ctx->nb_streams; i++) {
1829 AVStream *st = avformat_new_stream(s, NULL);
1830 AVStream *ist = pls->ctx->streams[i];
1832 ret = AVERROR(ENOMEM);
1836 avcodec_parameters_copy(st->codecpar, pls->ctx->streams[i]->codecpar);
1837 avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
1845 static int dash_read_header(AVFormatContext *s)
1847 void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb;
1848 DASHContext *c = s->priv_data;
1850 int stream_index = 0;
1853 c->interrupt_callback = &s->interrupt_callback;
1854 // if the URL context is good, read important options we must broker later
1856 update_options(&c->user_agent, "user-agent", u);
1857 update_options(&c->cookies, "cookies", u);
1858 update_options(&c->headers, "headers", u);
1861 if ((ret = parse_manifest(s, s->filename, s->pb)) < 0)
1864 if ((ret = save_avio_options(s)) < 0)
1867 /* If this isn't a live stream, fill the total duration of the
1870 s->duration = (int64_t) c->media_presentation_duration * AV_TIME_BASE;
1873 /* Open the demuxer for video and audio components if available */
1874 for (i = 0; i < c->n_videos; i++) {
1875 struct representation *cur_video = c->videos[i];
1876 ret = open_demux_for_component(s, cur_video);
1879 cur_video->stream_index = stream_index;
1883 for (i = 0; i < c->n_audios; i++) {
1884 struct representation *cur_audio = c->audios[i];
1885 ret = open_demux_for_component(s, cur_audio);
1888 cur_audio->stream_index = stream_index;
1892 if (!stream_index) {
1893 ret = AVERROR_INVALIDDATA;
1897 /* Create a program */
1900 program = av_new_program(s, 0);
1905 for (i = 0; i < c->n_videos; i++) {
1906 struct representation *pls = c->videos[i];
1908 av_program_add_stream_index(s, 0, pls->stream_index);
1909 pls->assoc_stream = s->streams[pls->stream_index];
1910 if (pls->bandwidth > 0)
1911 av_dict_set_int(&pls->assoc_stream->metadata, "variant_bitrate", pls->bandwidth, 0);
1913 av_dict_set(&pls->assoc_stream->metadata, "id", pls->id, 0);
1915 for (i = 0; i < c->n_audios; i++) {
1916 struct representation *pls = c->audios[i];
1918 av_program_add_stream_index(s, 0, pls->stream_index);
1919 pls->assoc_stream = s->streams[pls->stream_index];
1920 if (pls->bandwidth > 0)
1921 av_dict_set_int(&pls->assoc_stream->metadata, "variant_bitrate", pls->bandwidth, 0);
1923 av_dict_set(&pls->assoc_stream->metadata, "id", pls->id, 0);
1932 static void recheck_discard_flags(AVFormatContext *s, struct representation **p, int n)
1936 for (i = 0; i < n; i++) {
1937 struct representation *pls = p[i];
1939 int needed = !pls->assoc_stream || pls->assoc_stream->discard < AVDISCARD_ALL;
1940 if (needed && !pls->ctx) {
1941 pls->cur_seg_offset = 0;
1942 pls->init_sec_buf_read_offset = 0;
1944 for (j = 0; j < n; j++) {
1945 pls->cur_seq_no = FFMAX(pls->cur_seq_no, p[j]->cur_seq_no);
1947 reopen_demux_for_component(s, pls);
1948 av_log(s, AV_LOG_INFO, "Now receiving stream_index %d\n", pls->stream_index);
1949 } else if (!needed && pls->ctx) {
1950 close_demux_for_component(pls);
1952 ff_format_io_close(pls->parent, &pls->input);
1953 av_log(s, AV_LOG_INFO, "No longer receiving stream_index %d\n", pls->stream_index);
1958 static int dash_read_packet(AVFormatContext *s, AVPacket *pkt)
1960 DASHContext *c = s->priv_data;
1963 struct representation *cur = NULL;
1965 recheck_discard_flags(s, c->videos, c->n_videos);
1966 recheck_discard_flags(s, c->audios, c->n_audios);
1968 for (i = 0; i < c->n_videos; i++) {
1969 struct representation *pls = c->videos[i];
1972 if (!cur || pls->cur_timestamp < mints) {
1974 mints = pls->cur_timestamp;
1977 for (i = 0; i < c->n_audios; i++) {
1978 struct representation *pls = c->audios[i];
1981 if (!cur || pls->cur_timestamp < mints) {
1983 mints = pls->cur_timestamp;
1988 return AVERROR_INVALIDDATA;
1990 while (!ff_check_interrupt(c->interrupt_callback) && !ret) {
1991 ret = av_read_frame(cur->ctx, pkt);
1993 /* If we got a packet, return it */
1994 cur->cur_timestamp = av_rescale(pkt->pts, (int64_t)cur->ctx->streams[0]->time_base.num * 90000, cur->ctx->streams[0]->time_base.den);
1995 pkt->stream_index = cur->stream_index;
1998 if (cur->is_restart_needed) {
1999 cur->cur_seg_offset = 0;
2000 cur->init_sec_buf_read_offset = 0;
2002 ff_format_io_close(cur->parent, &cur->input);
2003 ret = reopen_demux_for_component(s, cur);
2004 cur->is_restart_needed = 0;
2010 static int dash_close(AVFormatContext *s)
2012 DASHContext *c = s->priv_data;
2016 av_freep(&c->cookies);
2017 av_freep(&c->user_agent);
2018 av_dict_free(&c->avio_opts);
2019 av_freep(&c->base_url);
2023 static int dash_seek(AVFormatContext *s, struct representation *pls, int64_t seek_pos_msec, int flags, int dry_run)
2028 int64_t duration = 0;
2030 av_log(pls->parent, AV_LOG_VERBOSE, "DASH seek pos[%"PRId64"ms], playlist %d%s\n",
2031 seek_pos_msec, pls->rep_idx, dry_run ? " (dry)" : "");
2033 // single fragment mode
2034 if (pls->n_fragments == 1) {
2035 pls->cur_timestamp = 0;
2036 pls->cur_seg_offset = 0;
2039 ff_read_frame_flush(pls->ctx);
2040 return av_seek_frame(pls->ctx, -1, seek_pos_msec * 1000, flags);
2044 ff_format_io_close(pls->parent, &pls->input);
2046 // find the nearest fragment
2047 if (pls->n_timelines > 0 && pls->fragment_timescale > 0) {
2048 int64_t num = pls->first_seq_no;
2049 av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline start n_timelines[%d] "
2050 "last_seq_no[%"PRId64"], playlist %d.\n",
2051 (int)pls->n_timelines, (int64_t)pls->last_seq_no, (int)pls->rep_idx);
2052 for (i = 0; i < pls->n_timelines; i++) {
2053 if (pls->timelines[i]->starttime > 0) {
2054 duration = pls->timelines[i]->starttime;
2056 duration += pls->timelines[i]->duration;
2057 if (seek_pos_msec < ((duration * 1000) / pls->fragment_timescale)) {
2060 for (j = 0; j < pls->timelines[i]->repeat; j++) {
2061 duration += pls->timelines[i]->duration;
2063 if (seek_pos_msec < ((duration * 1000) / pls->fragment_timescale)) {
2071 pls->cur_seq_no = num > pls->last_seq_no ? pls->last_seq_no : num;
2072 av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline end cur_seq_no[%"PRId64"], playlist %d.\n",
2073 (int64_t)pls->cur_seq_no, (int)pls->rep_idx);
2074 } else if (pls->fragment_duration > 0) {
2075 pls->cur_seq_no = pls->first_seq_no + ((seek_pos_msec * pls->fragment_timescale) / pls->fragment_duration) / 1000;
2077 av_log(pls->parent, AV_LOG_ERROR, "dash_seek missing timeline or fragment_duration\n");
2078 pls->cur_seq_no = pls->first_seq_no;
2080 pls->cur_timestamp = 0;
2081 pls->cur_seg_offset = 0;
2082 pls->init_sec_buf_read_offset = 0;
2083 ret = dry_run ? 0 : reopen_demux_for_component(s, pls);
2088 static int dash_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
2091 DASHContext *c = s->priv_data;
2092 int64_t seek_pos_msec = av_rescale_rnd(timestamp, 1000,
2093 s->streams[stream_index]->time_base.den,
2094 flags & AVSEEK_FLAG_BACKWARD ?
2095 AV_ROUND_DOWN : AV_ROUND_UP);
2096 if ((flags & AVSEEK_FLAG_BYTE) || c->is_live)
2097 return AVERROR(ENOSYS);
2099 /* Seek in discarded streams with dry_run=1 to avoid reopening them */
2100 for (i = 0; i < c->n_videos; i++) {
2102 ret = dash_seek(s, c->videos[i], seek_pos_msec, flags, !c->videos[i]->ctx);
2104 for (i = 0; i < c->n_audios; i++) {
2106 ret = dash_seek(s, c->audios[i], seek_pos_msec, flags, !c->audios[i]->ctx);
2112 static int dash_probe(AVProbeData *p)
2114 if (!av_stristr(p->buf, "<MPD"))
2117 if (av_stristr(p->buf, "dash:profile:isoff-on-demand:2011") ||
2118 av_stristr(p->buf, "dash:profile:isoff-live:2011") ||
2119 av_stristr(p->buf, "dash:profile:isoff-live:2012") ||
2120 av_stristr(p->buf, "dash:profile:isoff-main:2011")) {
2121 return AVPROBE_SCORE_MAX;
2123 if (av_stristr(p->buf, "dash:profile")) {
2124 return AVPROBE_SCORE_MAX;
2130 #define OFFSET(x) offsetof(DASHContext, x)
2131 #define FLAGS AV_OPT_FLAG_DECODING_PARAM
2132 static const AVOption dash_options[] = {
2133 {"allowed_extensions", "List of file extensions that dash is allowed to access",
2134 OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
2135 {.str = "aac,m4a,m4s,m4v,mov,mp4"},
2136 INT_MIN, INT_MAX, FLAGS},
2140 static const AVClass dash_class = {
2141 .class_name = "dash",
2142 .item_name = av_default_item_name,
2143 .option = dash_options,
2144 .version = LIBAVUTIL_VERSION_INT,
2147 AVInputFormat ff_dash_demuxer = {
2149 .long_name = NULL_IF_CONFIG_SMALL("Dynamic Adaptive Streaming over HTTP"),
2150 .priv_class = &dash_class,
2151 .priv_data_size = sizeof(DASHContext),
2152 .read_probe = dash_probe,
2153 .read_header = dash_read_header,
2154 .read_packet = dash_read_packet,
2155 .read_close = dash_close,
2156 .read_seek = dash_read_seek,
2157 .flags = AVFMT_NO_BYTE_SEEK,