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 *allowed_extensions;
147 AVDictionary *avio_opts;
150 /* Flags for init section*/
151 int is_init_section_common_video;
152 int is_init_section_common_audio;
156 static int ishttp(char *url)
158 const char *proto_name = avio_find_protocol_name(url);
159 return av_strstart(proto_name, "http", NULL);
162 static int aligned(int val)
164 return ((val + 0x3F) >> 6) << 6;
167 static uint64_t get_current_time_in_sec(void)
169 return av_gettime() / 1000000;
172 static uint64_t get_utc_date_time_insec(AVFormatContext *s, const char *datetime)
183 /* ISO-8601 date parser */
187 ret = sscanf(datetime, "%d-%d-%dT%d:%d:%fZ", &year, &month, &day, &hour, &minute, &second);
188 /* year, month, day, hour, minute, second 6 arguments */
190 av_log(s, AV_LOG_WARNING, "get_utc_date_time_insec get a wrong time format\n");
192 timeinfo.tm_year = year - 1900;
193 timeinfo.tm_mon = month - 1;
194 timeinfo.tm_mday = day;
195 timeinfo.tm_hour = hour;
196 timeinfo.tm_min = minute;
197 timeinfo.tm_sec = (int)second;
199 return av_timegm(&timeinfo);
202 static uint32_t get_duration_insec(AVFormatContext *s, const char *duration)
204 /* ISO-8601 duration parser */
212 const char *ptr = duration;
215 if (*ptr == 'P' || *ptr == 'T') {
220 if (sscanf(ptr, "%f%c%n", &value, &type, &size) != 2) {
221 av_log(s, AV_LOG_WARNING, "get_duration_insec get a wrong time format\n");
222 return 0; /* parser error */
226 days = (uint32_t)value;
229 hours = (uint32_t)value;
232 mins = (uint32_t)value;
235 secs = (uint32_t)value;
238 // handle invalid type
243 return ((days * 24 + hours) * 60 + mins) * 60 + secs;
246 static int64_t get_segment_start_time_based_on_timeline(struct representation *pls, int64_t cur_seq_no)
248 int64_t start_time = 0;
253 if (pls->n_timelines) {
254 for (i = 0; i < pls->n_timelines; i++) {
255 if (pls->timelines[i]->starttime > 0) {
256 start_time = pls->timelines[i]->starttime;
258 if (num == cur_seq_no)
261 start_time += pls->timelines[i]->duration;
263 if (pls->timelines[i]->repeat == -1) {
264 start_time = pls->timelines[i]->duration * cur_seq_no;
268 for (j = 0; j < pls->timelines[i]->repeat; j++) {
270 if (num == cur_seq_no)
272 start_time += pls->timelines[i]->duration;
281 static int64_t calc_next_seg_no_from_timelines(struct representation *pls, int64_t cur_time)
286 int64_t start_time = 0;
288 for (i = 0; i < pls->n_timelines; i++) {
289 if (pls->timelines[i]->starttime > 0) {
290 start_time = pls->timelines[i]->starttime;
292 if (start_time > cur_time)
295 start_time += pls->timelines[i]->duration;
296 for (j = 0; j < pls->timelines[i]->repeat; j++) {
298 if (start_time > cur_time)
300 start_time += pls->timelines[i]->duration;
311 static void free_fragment(struct fragment **seg)
316 av_freep(&(*seg)->url);
320 static void free_fragment_list(struct representation *pls)
324 for (i = 0; i < pls->n_fragments; i++) {
325 free_fragment(&pls->fragments[i]);
327 av_freep(&pls->fragments);
328 pls->n_fragments = 0;
331 static void free_timelines_list(struct representation *pls)
335 for (i = 0; i < pls->n_timelines; i++) {
336 av_freep(&pls->timelines[i]);
338 av_freep(&pls->timelines);
339 pls->n_timelines = 0;
342 static void free_representation(struct representation *pls)
344 free_fragment_list(pls);
345 free_timelines_list(pls);
346 free_fragment(&pls->cur_seg);
347 free_fragment(&pls->init_section);
348 av_freep(&pls->init_sec_buf);
349 av_freep(&pls->pb.buffer);
351 ff_format_io_close(pls->parent, &pls->input);
354 avformat_close_input(&pls->ctx);
357 av_freep(&pls->url_template);
361 static void free_video_list(DASHContext *c)
364 for (i = 0; i < c->n_videos; i++) {
365 struct representation *pls = c->videos[i];
366 free_representation(pls);
368 av_freep(&c->videos);
372 static void free_audio_list(DASHContext *c)
375 for (i = 0; i < c->n_audios; i++) {
376 struct representation *pls = c->audios[i];
377 free_representation(pls);
379 av_freep(&c->audios);
383 static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url,
384 AVDictionary *opts, AVDictionary *opts2, int *is_http)
386 DASHContext *c = s->priv_data;
387 AVDictionary *tmp = NULL;
388 const char *proto_name = NULL;
391 av_dict_copy(&tmp, opts, 0);
392 av_dict_copy(&tmp, opts2, 0);
394 if (av_strstart(url, "crypto", NULL)) {
395 if (url[6] == '+' || url[6] == ':')
396 proto_name = avio_find_protocol_name(url + 7);
400 proto_name = avio_find_protocol_name(url);
403 return AVERROR_INVALIDDATA;
405 // only http(s) & file are allowed
406 if (av_strstart(proto_name, "file", NULL)) {
407 if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) {
408 av_log(s, AV_LOG_ERROR,
409 "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n"
410 "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n",
412 return AVERROR_INVALIDDATA;
414 } else if (av_strstart(proto_name, "http", NULL)) {
417 return AVERROR_INVALIDDATA;
419 if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
421 else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':')
423 else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
424 return AVERROR_INVALIDDATA;
427 ret = avio_open2(pb, url, AVIO_FLAG_READ, c->interrupt_callback, &tmp);
429 // update cookies on http response with setcookies.
430 char *new_cookies = NULL;
432 if (!(s->flags & AVFMT_FLAG_CUSTOM_IO))
433 av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies);
436 av_dict_set(&opts, "cookies", new_cookies, AV_DICT_DONT_STRDUP_VAL);
444 *is_http = av_strstart(proto_name, "http", NULL);
449 static char *get_content_url(xmlNodePtr *baseurl_nodes,
453 char *rep_bandwidth_val,
459 char *tmp_str = av_mallocz(max_url_size);
460 char *tmp_str_2 = av_mallocz(max_url_size);
462 if (!tmp_str || !tmp_str_2) {
466 for (i = 0; i < n_baseurl_nodes; ++i) {
467 if (baseurl_nodes[i] &&
468 baseurl_nodes[i]->children &&
469 baseurl_nodes[i]->children->type == XML_TEXT_NODE) {
470 text = xmlNodeGetContent(baseurl_nodes[i]->children);
472 memset(tmp_str, 0, max_url_size);
473 memset(tmp_str_2, 0, max_url_size);
474 ff_make_absolute_url(tmp_str_2, max_url_size, tmp_str, text);
475 av_strlcpy(tmp_str, tmp_str_2, max_url_size);
482 av_strlcat(tmp_str, (const char*)val, max_url_size);
485 url = av_strireplace(tmp_str, "$RepresentationID$", (const char*)rep_id_val);
489 av_strlcpy(tmp_str, url, max_url_size);
491 if (rep_bandwidth_val && tmp_str[0] != '\0') {
492 // free any previously assigned url before reassigning
494 url = av_strireplace(tmp_str, "$Bandwidth$", (const char*)rep_bandwidth_val);
505 static char *get_val_from_nodes_tab(xmlNodePtr *nodes, const int n_nodes, const char *attrname)
510 for (i = 0; i < n_nodes; ++i) {
512 val = xmlGetProp(nodes[i], attrname);
521 static xmlNodePtr find_child_node_by_name(xmlNodePtr rootnode, const char *nodename)
523 xmlNodePtr node = rootnode;
528 node = xmlFirstElementChild(node);
530 if (!av_strcasecmp(node->name, nodename)) {
533 node = xmlNextElementSibling(node);
538 static enum AVMediaType get_content_type(xmlNodePtr node)
540 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
546 for (i = 0; i < 2; i++) {
547 attr = i ? "mimeType" : "contentType";
548 val = xmlGetProp(node, attr);
550 if (av_stristr((const char *)val, "video")) {
551 type = AVMEDIA_TYPE_VIDEO;
552 } else if (av_stristr((const char *)val, "audio")) {
553 type = AVMEDIA_TYPE_AUDIO;
562 static struct fragment * get_Fragment(char *range)
564 struct fragment * seg = av_mallocz(sizeof(struct fragment));
571 char *str_end_offset;
572 char *str_offset = av_strtok(range, "-", &str_end_offset);
573 seg->url_offset = strtoll(str_offset, NULL, 10);
574 seg->size = strtoll(str_end_offset, NULL, 10) - seg->url_offset;
580 static int parse_manifest_segmenturlnode(AVFormatContext *s, struct representation *rep,
581 xmlNodePtr fragmenturl_node,
582 xmlNodePtr *baseurl_nodes,
584 char *rep_bandwidth_val)
586 DASHContext *c = s->priv_data;
587 char *initialization_val = NULL;
588 char *media_val = NULL;
589 char *range_val = NULL;
590 int max_url_size = c ? c->max_url_size: MAX_URL_SIZE;
592 if (!av_strcasecmp(fragmenturl_node->name, (const char *)"Initialization")) {
593 initialization_val = xmlGetProp(fragmenturl_node, "sourceURL");
594 range_val = xmlGetProp(fragmenturl_node, "range");
595 if (initialization_val || range_val) {
596 rep->init_section = get_Fragment(range_val);
597 if (!rep->init_section) {
598 xmlFree(initialization_val);
600 return AVERROR(ENOMEM);
602 rep->init_section->url = get_content_url(baseurl_nodes, 4,
608 if (!rep->init_section->url) {
609 av_free(rep->init_section);
610 xmlFree(initialization_val);
612 return AVERROR(ENOMEM);
614 xmlFree(initialization_val);
617 } else if (!av_strcasecmp(fragmenturl_node->name, (const char *)"SegmentURL")) {
618 media_val = xmlGetProp(fragmenturl_node, "media");
619 range_val = xmlGetProp(fragmenturl_node, "mediaRange");
620 if (media_val || range_val) {
621 struct fragment *seg = get_Fragment(range_val);
625 return AVERROR(ENOMEM);
627 seg->url = get_content_url(baseurl_nodes, 4,
636 return AVERROR(ENOMEM);
638 dynarray_add(&rep->fragments, &rep->n_fragments, seg);
647 static int parse_manifest_segmenttimeline(AVFormatContext *s, struct representation *rep,
648 xmlNodePtr fragment_timeline_node)
650 xmlAttrPtr attr = NULL;
653 if (!av_strcasecmp(fragment_timeline_node->name, (const char *)"S")) {
654 struct timeline *tml = av_mallocz(sizeof(struct timeline));
656 return AVERROR(ENOMEM);
658 attr = fragment_timeline_node->properties;
660 val = xmlGetProp(fragment_timeline_node, attr->name);
663 av_log(s, AV_LOG_WARNING, "parse_manifest_segmenttimeline attr->name = %s val is NULL\n", attr->name);
667 if (!av_strcasecmp(attr->name, (const char *)"t")) {
668 tml->starttime = (int64_t)strtoll(val, NULL, 10);
669 } else if (!av_strcasecmp(attr->name, (const char *)"r")) {
670 tml->repeat =(int64_t) strtoll(val, NULL, 10);
671 } else if (!av_strcasecmp(attr->name, (const char *)"d")) {
672 tml->duration = (int64_t)strtoll(val, NULL, 10);
677 dynarray_add(&rep->timelines, &rep->n_timelines, tml);
683 static int resolve_content_path(AVFormatContext *s, const char *url, int *max_url_size, xmlNodePtr *baseurl_nodes, int n_baseurl_nodes) {
685 char *tmp_str = NULL;
687 char *mpdName = NULL;
688 xmlNodePtr node = NULL;
689 char *baseurl = NULL;
690 char *root_url = NULL;
701 int tmp_max_url_size = strlen(url);
703 for (i = n_baseurl_nodes-1; i >= 0 ; i--) {
704 text = xmlNodeGetContent(baseurl_nodes[i]);
707 tmp_max_url_size += strlen(text);
715 tmp_max_url_size = aligned(tmp_max_url_size);
716 text = av_mallocz(tmp_max_url_size);
718 updated = AVERROR(ENOMEM);
721 av_strlcpy(text, url, strlen(url)+1);
723 while (mpdName = av_strtok(tmp, "/", &tmp)) {
724 size = strlen(mpdName);
728 path = av_mallocz(tmp_max_url_size);
729 tmp_str = av_mallocz(tmp_max_url_size);
730 if (!tmp_str || !path) {
731 updated = AVERROR(ENOMEM);
735 av_strlcpy (path, url, strlen(url) - size + 1);
736 for (rootId = n_baseurl_nodes - 1; rootId > 0; rootId --) {
737 if (!(node = baseurl_nodes[rootId])) {
740 text = xmlNodeGetContent(node);
748 node = baseurl_nodes[rootId];
749 baseurl = xmlNodeGetContent(node);
750 root_url = (av_strcasecmp(baseurl, "")) ? baseurl : path;
752 xmlNodeSetContent(node, root_url);
756 size = strlen(root_url);
757 isRootHttp = ishttp(root_url);
759 if (root_url[size - 1] != token) {
760 av_strlcat(root_url, "/", size + 2);
764 for (i = 0; i < n_baseurl_nodes; ++i) {
768 text = xmlNodeGetContent(baseurl_nodes[i]);
770 memset(tmp_str, 0, strlen(tmp_str));
771 if (!ishttp(text) && isRootHttp) {
772 av_strlcpy(tmp_str, root_url, size + 1);
774 start = (text[0] == token);
775 av_strlcat(tmp_str, text + start, tmp_max_url_size);
776 xmlNodeSetContent(baseurl_nodes[i], tmp_str);
783 if (tmp_max_url_size > *max_url_size) {
784 *max_url_size = tmp_max_url_size;
793 static int parse_manifest_representation(AVFormatContext *s, const char *url,
795 xmlNodePtr adaptionset_node,
796 xmlNodePtr mpd_baseurl_node,
797 xmlNodePtr period_baseurl_node,
798 xmlNodePtr period_segmenttemplate_node,
799 xmlNodePtr period_segmentlist_node,
800 xmlNodePtr fragment_template_node,
801 xmlNodePtr content_component_node,
802 xmlNodePtr adaptionset_baseurl_node,
803 xmlNodePtr adaptionset_segmentlist_node,
804 xmlNodePtr adaptionset_supplementalproperty_node)
807 int32_t audio_rep_idx = 0;
808 int32_t video_rep_idx = 0;
809 DASHContext *c = s->priv_data;
810 struct representation *rep = NULL;
811 struct fragment *seg = NULL;
812 xmlNodePtr representation_segmenttemplate_node = NULL;
813 xmlNodePtr representation_baseurl_node = NULL;
814 xmlNodePtr representation_segmentlist_node = NULL;
815 xmlNodePtr segmentlists_tab[2];
816 xmlNodePtr fragment_timeline_node = NULL;
817 xmlNodePtr fragment_templates_tab[5];
818 char *duration_val = NULL;
819 char *presentation_timeoffset_val = NULL;
820 char *startnumber_val = NULL;
821 char *timescale_val = NULL;
822 char *initialization_val = NULL;
823 char *media_val = NULL;
825 xmlNodePtr baseurl_nodes[4];
826 xmlNodePtr representation_node = node;
827 char *rep_id_val = xmlGetProp(representation_node, "id");
828 char *rep_bandwidth_val = xmlGetProp(representation_node, "bandwidth");
829 char *rep_framerate_val = xmlGetProp(representation_node, "frameRate");
830 enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN;
832 // try get information from representation
833 if (type == AVMEDIA_TYPE_UNKNOWN)
834 type = get_content_type(representation_node);
835 // try get information from contentComponen
836 if (type == AVMEDIA_TYPE_UNKNOWN)
837 type = get_content_type(content_component_node);
838 // try get information from adaption set
839 if (type == AVMEDIA_TYPE_UNKNOWN)
840 type = get_content_type(adaptionset_node);
841 if (type == AVMEDIA_TYPE_UNKNOWN) {
842 av_log(s, AV_LOG_VERBOSE, "Parsing '%s' - skipp not supported representation type\n", url);
843 } else if (type == AVMEDIA_TYPE_VIDEO || type == AVMEDIA_TYPE_AUDIO) {
844 // convert selected representation to our internal struct
845 rep = av_mallocz(sizeof(struct representation));
847 ret = AVERROR(ENOMEM);
850 representation_segmenttemplate_node = find_child_node_by_name(representation_node, "SegmentTemplate");
851 representation_baseurl_node = find_child_node_by_name(representation_node, "BaseURL");
852 representation_segmentlist_node = find_child_node_by_name(representation_node, "SegmentList");
854 baseurl_nodes[0] = mpd_baseurl_node;
855 baseurl_nodes[1] = period_baseurl_node;
856 baseurl_nodes[2] = adaptionset_baseurl_node;
857 baseurl_nodes[3] = representation_baseurl_node;
859 ret = resolve_content_path(s, url, &c->max_url_size, baseurl_nodes, 4);
860 c->max_url_size = aligned(c->max_url_size + strlen(rep_id_val) + strlen(rep_bandwidth_val));
861 if (ret == AVERROR(ENOMEM) || ret == 0) {
864 if (representation_segmenttemplate_node || fragment_template_node || period_segmenttemplate_node) {
865 fragment_timeline_node = NULL;
866 fragment_templates_tab[0] = representation_segmenttemplate_node;
867 fragment_templates_tab[1] = adaptionset_segmentlist_node;
868 fragment_templates_tab[2] = fragment_template_node;
869 fragment_templates_tab[3] = period_segmenttemplate_node;
870 fragment_templates_tab[4] = period_segmentlist_node;
872 presentation_timeoffset_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "presentationTimeOffset");
873 duration_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "duration");
874 startnumber_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "startNumber");
875 timescale_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "timescale");
876 initialization_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "initialization");
877 media_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "media");
879 if (initialization_val) {
880 rep->init_section = av_mallocz(sizeof(struct fragment));
881 if (!rep->init_section) {
883 ret = AVERROR(ENOMEM);
886 c->max_url_size = aligned(c->max_url_size + strlen(initialization_val));
887 rep->init_section->url = get_content_url(baseurl_nodes, 4, c->max_url_size, rep_id_val, rep_bandwidth_val, initialization_val);
888 if (!rep->init_section->url) {
889 av_free(rep->init_section);
891 ret = AVERROR(ENOMEM);
894 rep->init_section->size = -1;
895 xmlFree(initialization_val);
899 c->max_url_size = aligned(c->max_url_size + strlen(media_val));
900 rep->url_template = get_content_url(baseurl_nodes, 4, c->max_url_size, rep_id_val, rep_bandwidth_val, media_val);
904 if (presentation_timeoffset_val) {
905 rep->presentation_timeoffset = (int64_t) strtoll(presentation_timeoffset_val, NULL, 10);
906 xmlFree(presentation_timeoffset_val);
909 rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10);
910 xmlFree(duration_val);
913 rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10);
914 xmlFree(timescale_val);
916 if (startnumber_val) {
917 rep->first_seq_no = (int64_t) strtoll(startnumber_val, NULL, 10);
918 xmlFree(startnumber_val);
920 if (adaptionset_supplementalproperty_node) {
921 if (!av_strcasecmp(xmlGetProp(adaptionset_supplementalproperty_node,"schemeIdUri"), "http://dashif.org/guidelines/last-segment-number")) {
922 val = xmlGetProp(adaptionset_supplementalproperty_node,"value");
924 av_log(s, AV_LOG_ERROR, "Missing value attribute in adaptionset_supplementalproperty_node\n");
926 rep->last_seq_no =(int64_t) strtoll(val, NULL, 10) - 1;
932 fragment_timeline_node = find_child_node_by_name(representation_segmenttemplate_node, "SegmentTimeline");
934 if (!fragment_timeline_node)
935 fragment_timeline_node = find_child_node_by_name(fragment_template_node, "SegmentTimeline");
936 if (!fragment_timeline_node)
937 fragment_timeline_node = find_child_node_by_name(adaptionset_segmentlist_node, "SegmentTimeline");
938 if (!fragment_timeline_node)
939 fragment_timeline_node = find_child_node_by_name(period_segmentlist_node, "SegmentTimeline");
940 if (fragment_timeline_node) {
941 fragment_timeline_node = xmlFirstElementChild(fragment_timeline_node);
942 while (fragment_timeline_node) {
943 ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node);
947 fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node);
950 } else if (representation_baseurl_node && !representation_segmentlist_node) {
951 seg = av_mallocz(sizeof(struct fragment));
953 ret = AVERROR(ENOMEM);
956 seg->url = get_content_url(baseurl_nodes, 4, c->max_url_size, rep_id_val, rep_bandwidth_val, NULL);
959 ret = AVERROR(ENOMEM);
963 dynarray_add(&rep->fragments, &rep->n_fragments, seg);
964 } else if (representation_segmentlist_node) {
965 // TODO: https://www.brendanlong.com/the-structure-of-an-mpeg-dash-mpd.html
966 // http://www-itec.uni-klu.ac.at/dash/ddash/mpdGenerator.php?fragmentlength=15&type=full
967 xmlNodePtr fragmenturl_node = NULL;
968 segmentlists_tab[0] = representation_segmentlist_node;
969 segmentlists_tab[1] = adaptionset_segmentlist_node;
971 duration_val = get_val_from_nodes_tab(segmentlists_tab, 2, "duration");
972 timescale_val = get_val_from_nodes_tab(segmentlists_tab, 2, "timescale");
974 rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10);
975 xmlFree(duration_val);
978 rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10);
979 xmlFree(timescale_val);
981 fragmenturl_node = xmlFirstElementChild(representation_segmentlist_node);
982 while (fragmenturl_node) {
983 ret = parse_manifest_segmenturlnode(s, rep, fragmenturl_node,
990 fragmenturl_node = xmlNextElementSibling(fragmenturl_node);
993 fragment_timeline_node = find_child_node_by_name(representation_segmenttemplate_node, "SegmentTimeline");
995 if (!fragment_timeline_node)
996 fragment_timeline_node = find_child_node_by_name(fragment_template_node, "SegmentTimeline");
997 if (!fragment_timeline_node)
998 fragment_timeline_node = find_child_node_by_name(adaptionset_segmentlist_node, "SegmentTimeline");
999 if (!fragment_timeline_node)
1000 fragment_timeline_node = find_child_node_by_name(period_segmentlist_node, "SegmentTimeline");
1001 if (fragment_timeline_node) {
1002 fragment_timeline_node = xmlFirstElementChild(fragment_timeline_node);
1003 while (fragment_timeline_node) {
1004 ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node);
1008 fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node);
1012 free_representation(rep);
1014 av_log(s, AV_LOG_ERROR, "Unknown format of Representation node id[%s] \n", (const char *)rep_id_val);
1018 if (rep->fragment_duration > 0 && !rep->fragment_timescale)
1019 rep->fragment_timescale = 1;
1020 rep->bandwidth = rep_bandwidth_val ? atoi(rep_bandwidth_val) : 0;
1021 strncpy(rep->id, rep_id_val ? rep_id_val : "", sizeof(rep->id));
1022 rep->framerate = av_make_q(0, 0);
1023 if (type == AVMEDIA_TYPE_VIDEO && rep_framerate_val) {
1024 ret = av_parse_video_rate(&rep->framerate, rep_framerate_val);
1026 av_log(s, AV_LOG_VERBOSE, "Ignoring invalid frame rate '%s'\n", rep_framerate_val);
1029 if (type == AVMEDIA_TYPE_VIDEO) {
1030 rep->rep_idx = video_rep_idx;
1031 dynarray_add(&c->videos, &c->n_videos, rep);
1033 rep->rep_idx = audio_rep_idx;
1034 dynarray_add(&c->audios, &c->n_audios, rep);
1039 video_rep_idx += type == AVMEDIA_TYPE_VIDEO;
1040 audio_rep_idx += type == AVMEDIA_TYPE_AUDIO;
1044 xmlFree(rep_id_val);
1045 if (rep_bandwidth_val)
1046 xmlFree(rep_bandwidth_val);
1047 if (rep_framerate_val)
1048 xmlFree(rep_framerate_val);
1053 static int parse_manifest_adaptationset(AVFormatContext *s, const char *url,
1054 xmlNodePtr adaptionset_node,
1055 xmlNodePtr mpd_baseurl_node,
1056 xmlNodePtr period_baseurl_node,
1057 xmlNodePtr period_segmenttemplate_node,
1058 xmlNodePtr period_segmentlist_node)
1061 xmlNodePtr fragment_template_node = NULL;
1062 xmlNodePtr content_component_node = NULL;
1063 xmlNodePtr adaptionset_baseurl_node = NULL;
1064 xmlNodePtr adaptionset_segmentlist_node = NULL;
1065 xmlNodePtr adaptionset_supplementalproperty_node = NULL;
1066 xmlNodePtr node = NULL;
1068 node = xmlFirstElementChild(adaptionset_node);
1070 if (!av_strcasecmp(node->name, (const char *)"SegmentTemplate")) {
1071 fragment_template_node = node;
1072 } else if (!av_strcasecmp(node->name, (const char *)"ContentComponent")) {
1073 content_component_node = node;
1074 } else if (!av_strcasecmp(node->name, (const char *)"BaseURL")) {
1075 adaptionset_baseurl_node = node;
1076 } else if (!av_strcasecmp(node->name, (const char *)"SegmentList")) {
1077 adaptionset_segmentlist_node = node;
1078 } else if (!av_strcasecmp(node->name, (const char *)"SupplementalProperty")) {
1079 adaptionset_supplementalproperty_node = node;
1080 } else if (!av_strcasecmp(node->name, (const char *)"Representation")) {
1081 ret = parse_manifest_representation(s, url, node,
1084 period_baseurl_node,
1085 period_segmenttemplate_node,
1086 period_segmentlist_node,
1087 fragment_template_node,
1088 content_component_node,
1089 adaptionset_baseurl_node,
1090 adaptionset_segmentlist_node,
1091 adaptionset_supplementalproperty_node);
1096 node = xmlNextElementSibling(node);
1101 static int parse_manifest(AVFormatContext *s, const char *url, AVIOContext *in)
1103 DASHContext *c = s->priv_data;
1106 uint8_t *new_url = NULL;
1107 int64_t filesize = 0;
1108 char *buffer = NULL;
1109 AVDictionary *opts = NULL;
1111 xmlNodePtr root_element = NULL;
1112 xmlNodePtr node = NULL;
1113 xmlNodePtr period_node = NULL;
1114 xmlNodePtr tmp_node = NULL;
1115 xmlNodePtr mpd_baseurl_node = NULL;
1116 xmlNodePtr period_baseurl_node = NULL;
1117 xmlNodePtr period_segmenttemplate_node = NULL;
1118 xmlNodePtr period_segmentlist_node = NULL;
1119 xmlNodePtr adaptionset_node = NULL;
1120 xmlAttrPtr attr = NULL;
1122 uint32_t period_duration_sec = 0;
1123 uint32_t period_start_sec = 0;
1128 av_dict_copy(&opts, c->avio_opts, 0);
1129 ret = avio_open2(&in, url, AVIO_FLAG_READ, c->interrupt_callback, &opts);
1130 av_dict_free(&opts);
1135 if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, &new_url) >= 0) {
1136 c->base_url = av_strdup(new_url);
1138 c->base_url = av_strdup(url);
1141 filesize = avio_size(in);
1142 if (filesize <= 0) {
1143 filesize = 8 * 1024;
1146 buffer = av_mallocz(filesize);
1148 av_free(c->base_url);
1149 return AVERROR(ENOMEM);
1152 filesize = avio_read(in, buffer, filesize);
1153 if (filesize <= 0) {
1154 av_log(s, AV_LOG_ERROR, "Unable to read to offset '%s'\n", url);
1155 ret = AVERROR_INVALIDDATA;
1159 doc = xmlReadMemory(buffer, filesize, c->base_url, NULL, 0);
1160 root_element = xmlDocGetRootElement(doc);
1161 node = root_element;
1164 ret = AVERROR_INVALIDDATA;
1165 av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing root node\n", url);
1169 if (node->type != XML_ELEMENT_NODE ||
1170 av_strcasecmp(node->name, (const char *)"MPD")) {
1171 ret = AVERROR_INVALIDDATA;
1172 av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - wrong root node name[%s] type[%d]\n", url, node->name, (int)node->type);
1176 val = xmlGetProp(node, "type");
1178 av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing type attrib\n", url);
1179 ret = AVERROR_INVALIDDATA;
1182 if (!av_strcasecmp(val, (const char *)"dynamic"))
1186 attr = node->properties;
1188 val = xmlGetProp(node, attr->name);
1190 if (!av_strcasecmp(attr->name, (const char *)"availabilityStartTime")) {
1191 c->availability_start_time = get_utc_date_time_insec(s, (const char *)val);
1192 } else if (!av_strcasecmp(attr->name, (const char *)"publishTime")) {
1193 c->publish_time = get_utc_date_time_insec(s, (const char *)val);
1194 } else if (!av_strcasecmp(attr->name, (const char *)"minimumUpdatePeriod")) {
1195 c->minimum_update_period = get_duration_insec(s, (const char *)val);
1196 } else if (!av_strcasecmp(attr->name, (const char *)"timeShiftBufferDepth")) {
1197 c->time_shift_buffer_depth = get_duration_insec(s, (const char *)val);
1198 } else if (!av_strcasecmp(attr->name, (const char *)"minBufferTime")) {
1199 c->min_buffer_time = get_duration_insec(s, (const char *)val);
1200 } else if (!av_strcasecmp(attr->name, (const char *)"suggestedPresentationDelay")) {
1201 c->suggested_presentation_delay = get_duration_insec(s, (const char *)val);
1202 } else if (!av_strcasecmp(attr->name, (const char *)"mediaPresentationDuration")) {
1203 c->media_presentation_duration = get_duration_insec(s, (const char *)val);
1209 tmp_node = find_child_node_by_name(node, "BaseURL");
1211 mpd_baseurl_node = xmlCopyNode(tmp_node,1);
1213 mpd_baseurl_node = xmlNewNode(NULL, "BaseURL");
1216 // at now we can handle only one period, with the longest duration
1217 node = xmlFirstElementChild(node);
1219 if (!av_strcasecmp(node->name, (const char *)"Period")) {
1220 period_duration_sec = 0;
1221 period_start_sec = 0;
1222 attr = node->properties;
1224 val = xmlGetProp(node, attr->name);
1225 if (!av_strcasecmp(attr->name, (const char *)"duration")) {
1226 period_duration_sec = get_duration_insec(s, (const char *)val);
1227 } else if (!av_strcasecmp(attr->name, (const char *)"start")) {
1228 period_start_sec = get_duration_insec(s, (const char *)val);
1233 if ((period_duration_sec) >= (c->period_duration)) {
1235 c->period_duration = period_duration_sec;
1236 c->period_start = period_start_sec;
1237 if (c->period_start > 0)
1238 c->media_presentation_duration = c->period_duration;
1241 node = xmlNextElementSibling(node);
1244 av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing Period node\n", url);
1245 ret = AVERROR_INVALIDDATA;
1249 adaptionset_node = xmlFirstElementChild(period_node);
1250 while (adaptionset_node) {
1251 if (!av_strcasecmp(adaptionset_node->name, (const char *)"BaseURL")) {
1252 period_baseurl_node = adaptionset_node;
1253 } else if (!av_strcasecmp(adaptionset_node->name, (const char *)"SegmentTemplate")) {
1254 period_segmenttemplate_node = adaptionset_node;
1255 } else if (!av_strcasecmp(adaptionset_node->name, (const char *)"SegmentList")) {
1256 period_segmentlist_node = adaptionset_node;
1257 } else if (!av_strcasecmp(adaptionset_node->name, (const char *)"AdaptationSet")) {
1258 parse_manifest_adaptationset(s, url, adaptionset_node, mpd_baseurl_node, period_baseurl_node, period_segmenttemplate_node, period_segmentlist_node);
1260 adaptionset_node = xmlNextElementSibling(adaptionset_node);
1263 /*free the document */
1266 xmlFreeNode(mpd_baseurl_node);
1277 static int64_t calc_cur_seg_no(AVFormatContext *s, struct representation *pls)
1279 DASHContext *c = s->priv_data;
1281 int64_t start_time_offset = 0;
1284 if (pls->n_fragments) {
1285 num = pls->first_seq_no;
1286 } else if (pls->n_timelines) {
1287 start_time_offset = get_segment_start_time_based_on_timeline(pls, 0xFFFFFFFF) - 60 * pls->fragment_timescale; // 60 seconds before end
1288 num = calc_next_seg_no_from_timelines(pls, start_time_offset);
1290 num = pls->first_seq_no;
1292 num += pls->first_seq_no;
1293 } else if (pls->fragment_duration){
1294 if (pls->presentation_timeoffset) {
1295 num = pls->presentation_timeoffset * pls->fragment_timescale / pls->fragment_duration;
1296 } else if (c->publish_time > 0 && !c->availability_start_time) {
1297 num = pls->first_seq_no + (((c->publish_time - c->availability_start_time) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration;
1299 num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration;
1303 num = pls->first_seq_no;
1308 static int64_t calc_min_seg_no(AVFormatContext *s, struct representation *pls)
1310 DASHContext *c = s->priv_data;
1313 if (c->is_live && pls->fragment_duration) {
1314 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;
1316 num = pls->first_seq_no;
1321 static int64_t calc_max_seg_no(struct representation *pls, DASHContext *c)
1325 if (pls->n_fragments) {
1326 num = pls->first_seq_no + pls->n_fragments - 1;
1327 } else if (pls->n_timelines) {
1329 num = pls->first_seq_no + pls->n_timelines - 1;
1330 for (i = 0; i < pls->n_timelines; i++) {
1331 if (pls->timelines[i]->repeat == -1) {
1332 int length_of_each_segment = pls->timelines[i]->duration / pls->fragment_timescale;
1333 num = c->period_duration / length_of_each_segment;
1335 num += pls->timelines[i]->repeat;
1338 } else if (c->is_live && pls->fragment_duration) {
1339 num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time)) * pls->fragment_timescale) / pls->fragment_duration;
1340 } else if (pls->fragment_duration) {
1341 num = pls->first_seq_no + (c->media_presentation_duration * pls->fragment_timescale) / pls->fragment_duration;
1347 static void move_timelines(struct representation *rep_src, struct representation *rep_dest, DASHContext *c)
1349 if (rep_dest && rep_src ) {
1350 free_timelines_list(rep_dest);
1351 rep_dest->timelines = rep_src->timelines;
1352 rep_dest->n_timelines = rep_src->n_timelines;
1353 rep_dest->first_seq_no = rep_src->first_seq_no;
1354 rep_dest->last_seq_no = calc_max_seg_no(rep_dest, c);
1355 rep_src->timelines = NULL;
1356 rep_src->n_timelines = 0;
1357 rep_dest->cur_seq_no = rep_src->cur_seq_no;
1361 static void move_segments(struct representation *rep_src, struct representation *rep_dest, DASHContext *c)
1363 if (rep_dest && rep_src ) {
1364 free_fragment_list(rep_dest);
1365 if (rep_src->start_number > (rep_dest->start_number + rep_dest->n_fragments))
1366 rep_dest->cur_seq_no = 0;
1368 rep_dest->cur_seq_no += rep_src->start_number - rep_dest->start_number;
1369 rep_dest->fragments = rep_src->fragments;
1370 rep_dest->n_fragments = rep_src->n_fragments;
1371 rep_dest->parent = rep_src->parent;
1372 rep_dest->last_seq_no = calc_max_seg_no(rep_dest, c);
1373 rep_src->fragments = NULL;
1374 rep_src->n_fragments = 0;
1379 static int refresh_manifest(AVFormatContext *s)
1383 DASHContext *c = s->priv_data;
1385 // save current context
1386 int n_videos = c->n_videos;
1387 struct representation **videos = c->videos;
1388 int n_audios = c->n_audios;
1389 struct representation **audios = c->audios;
1390 char *base_url = c->base_url;
1397 ret = parse_manifest(s, s->url, NULL);
1401 if (c->n_videos != n_videos) {
1402 av_log(c, AV_LOG_ERROR,
1403 "new manifest has mismatched no. of video representations, %d -> %d\n",
1404 n_videos, c->n_videos);
1405 return AVERROR_INVALIDDATA;
1407 if (c->n_audios != n_audios) {
1408 av_log(c, AV_LOG_ERROR,
1409 "new manifest has mismatched no. of audio representations, %d -> %d\n",
1410 n_audios, c->n_audios);
1411 return AVERROR_INVALIDDATA;
1414 for (i = 0; i < n_videos; i++) {
1415 struct representation *cur_video = videos[i];
1416 struct representation *ccur_video = c->videos[i];
1417 if (cur_video->timelines) {
1418 // calc current time
1419 int64_t currentTime = get_segment_start_time_based_on_timeline(cur_video, cur_video->cur_seq_no) / cur_video->fragment_timescale;
1421 ccur_video->cur_seq_no = calc_next_seg_no_from_timelines(ccur_video, currentTime * cur_video->fragment_timescale - 1);
1422 if (ccur_video->cur_seq_no >= 0) {
1423 move_timelines(ccur_video, cur_video, c);
1426 if (cur_video->fragments) {
1427 move_segments(ccur_video, cur_video, c);
1430 for (i = 0; i < n_audios; i++) {
1431 struct representation *cur_audio = audios[i];
1432 struct representation *ccur_audio = c->audios[i];
1433 if (cur_audio->timelines) {
1434 // calc current time
1435 int64_t currentTime = get_segment_start_time_based_on_timeline(cur_audio, cur_audio->cur_seq_no) / cur_audio->fragment_timescale;
1437 ccur_audio->cur_seq_no = calc_next_seg_no_from_timelines(ccur_audio, currentTime * cur_audio->fragment_timescale - 1);
1438 if (ccur_audio->cur_seq_no >= 0) {
1439 move_timelines(ccur_audio, cur_audio, c);
1442 if (cur_audio->fragments) {
1443 move_segments(ccur_audio, cur_audio, c);
1452 c->base_url = base_url;
1457 c->n_audios = n_audios;
1459 c->n_videos = n_videos;
1464 static struct fragment *get_current_fragment(struct representation *pls)
1466 int64_t min_seq_no = 0;
1467 int64_t max_seq_no = 0;
1468 struct fragment *seg = NULL;
1469 struct fragment *seg_ptr = NULL;
1470 DASHContext *c = pls->parent->priv_data;
1472 while (( !ff_check_interrupt(c->interrupt_callback)&& pls->n_fragments > 0)) {
1473 if (pls->cur_seq_no < pls->n_fragments) {
1474 seg_ptr = pls->fragments[pls->cur_seq_no];
1475 seg = av_mallocz(sizeof(struct fragment));
1479 seg->url = av_strdup(seg_ptr->url);
1484 seg->size = seg_ptr->size;
1485 seg->url_offset = seg_ptr->url_offset;
1487 } else if (c->is_live) {
1488 refresh_manifest(pls->parent);
1494 min_seq_no = calc_min_seg_no(pls->parent, pls);
1495 max_seq_no = calc_max_seg_no(pls, c);
1497 if (pls->timelines || pls->fragments) {
1498 refresh_manifest(pls->parent);
1500 if (pls->cur_seq_no <= min_seq_no) {
1501 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);
1502 pls->cur_seq_no = calc_cur_seg_no(pls->parent, pls);
1503 } else if (pls->cur_seq_no > max_seq_no) {
1504 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);
1506 seg = av_mallocz(sizeof(struct fragment));
1510 } else if (pls->cur_seq_no <= pls->last_seq_no) {
1511 seg = av_mallocz(sizeof(struct fragment));
1517 char *tmpfilename= av_mallocz(c->max_url_size);
1521 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));
1522 seg->url = av_strireplace(pls->url_template, pls->url_template, tmpfilename);
1524 av_log(pls->parent, AV_LOG_WARNING, "Unable to resolve template url '%s', try to use origin template\n", pls->url_template);
1525 seg->url = av_strdup(pls->url_template);
1527 av_log(pls->parent, AV_LOG_ERROR, "Cannot resolve template url '%s'\n", pls->url_template);
1528 av_free(tmpfilename);
1532 av_free(tmpfilename);
1539 enum ReadFromURLMode {
1544 static int read_from_url(struct representation *pls, struct fragment *seg,
1545 uint8_t *buf, int buf_size,
1546 enum ReadFromURLMode mode)
1550 /* limit read if the fragment was only a part of a file */
1552 buf_size = FFMIN(buf_size, pls->cur_seg_size - pls->cur_seg_offset);
1554 if (mode == READ_COMPLETE) {
1555 ret = avio_read(pls->input, buf, buf_size);
1556 if (ret < buf_size) {
1557 av_log(pls->parent, AV_LOG_WARNING, "Could not read complete fragment.\n");
1560 ret = avio_read(pls->input, buf, buf_size);
1563 pls->cur_seg_offset += ret;
1568 static int open_input(DASHContext *c, struct representation *pls, struct fragment *seg)
1570 AVDictionary *opts = NULL;
1574 url = av_mallocz(c->max_url_size);
1579 if (seg->size >= 0) {
1580 /* try to restrict the HTTP request to the part we want
1581 * (if this is in fact a HTTP request) */
1582 av_dict_set_int(&opts, "offset", seg->url_offset, 0);
1583 av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0);
1586 ff_make_absolute_url(url, c->max_url_size, c->base_url, seg->url);
1587 av_log(pls->parent, AV_LOG_VERBOSE, "DASH request for url '%s', offset %"PRId64", playlist %d\n",
1588 url, seg->url_offset, pls->rep_idx);
1589 ret = open_url(pls->parent, &pls->input, url, c->avio_opts, opts, NULL);
1596 av_dict_free(&opts);
1597 pls->cur_seg_offset = 0;
1598 pls->cur_seg_size = seg->size;
1602 static int update_init_section(struct representation *pls)
1604 static const int max_init_section_size = 1024 * 1024;
1605 DASHContext *c = pls->parent->priv_data;
1610 if (!pls->init_section || pls->init_sec_buf)
1613 ret = open_input(c, pls, pls->init_section);
1615 av_log(pls->parent, AV_LOG_WARNING,
1616 "Failed to open an initialization section in playlist %d\n",
1621 if (pls->init_section->size >= 0)
1622 sec_size = pls->init_section->size;
1623 else if ((urlsize = avio_size(pls->input)) >= 0)
1626 sec_size = max_init_section_size;
1628 av_log(pls->parent, AV_LOG_DEBUG,
1629 "Downloading an initialization section of size %"PRId64"\n",
1632 sec_size = FFMIN(sec_size, max_init_section_size);
1634 av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size);
1636 ret = read_from_url(pls, pls->init_section, pls->init_sec_buf,
1637 pls->init_sec_buf_size, READ_COMPLETE);
1638 ff_format_io_close(pls->parent, &pls->input);
1643 pls->init_sec_data_len = ret;
1644 pls->init_sec_buf_read_offset = 0;
1649 static int64_t seek_data(void *opaque, int64_t offset, int whence)
1651 struct representation *v = opaque;
1652 if (v->n_fragments && !v->init_sec_data_len) {
1653 return avio_seek(v->input, offset, whence);
1656 return AVERROR(ENOSYS);
1659 static int read_data(void *opaque, uint8_t *buf, int buf_size)
1662 struct representation *v = opaque;
1663 DASHContext *c = v->parent->priv_data;
1667 free_fragment(&v->cur_seg);
1668 v->cur_seg = get_current_fragment(v);
1674 /* load/update Media Initialization Section, if any */
1675 ret = update_init_section(v);
1679 ret = open_input(c, v, v->cur_seg);
1681 if (ff_check_interrupt(c->interrupt_callback)) {
1685 av_log(v->parent, AV_LOG_WARNING, "Failed to open fragment of playlist %d\n", v->rep_idx);
1691 if (v->init_sec_buf_read_offset < v->init_sec_data_len) {
1692 /* Push init section out first before first actual fragment */
1693 int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size);
1694 memcpy(buf, v->init_sec_buf, copy_size);
1695 v->init_sec_buf_read_offset += copy_size;
1700 /* check the v->cur_seg, if it is null, get current and double check if the new v->cur_seg*/
1702 v->cur_seg = get_current_fragment(v);
1708 ret = read_from_url(v, v->cur_seg, buf, buf_size, READ_NORMAL);
1712 if (c->is_live || v->cur_seq_no < v->last_seq_no) {
1713 if (!v->is_restart_needed)
1715 v->is_restart_needed = 1;
1722 static int save_avio_options(AVFormatContext *s)
1724 DASHContext *c = s->priv_data;
1725 const char *opts[] = { "headers", "user_agent", "cookies", NULL }, **opt = opts;
1726 uint8_t *buf = NULL;
1730 if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN, &buf) >= 0) {
1731 if (buf[0] != '\0') {
1732 ret = av_dict_set(&c->avio_opts, *opt, buf, AV_DICT_DONT_STRDUP_VAL);
1747 static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url,
1748 int flags, AVDictionary **opts)
1750 av_log(s, AV_LOG_ERROR,
1751 "A DASH playlist item '%s' referred to an external file '%s'. "
1752 "Opening this file was forbidden for security reasons\n",
1754 return AVERROR(EPERM);
1757 static void close_demux_for_component(struct representation *pls)
1759 /* note: the internal buffer could have changed */
1760 av_freep(&pls->pb.buffer);
1761 memset(&pls->pb, 0x00, sizeof(AVIOContext));
1762 pls->ctx->pb = NULL;
1763 avformat_close_input(&pls->ctx);
1767 static int reopen_demux_for_component(AVFormatContext *s, struct representation *pls)
1769 DASHContext *c = s->priv_data;
1770 AVInputFormat *in_fmt = NULL;
1771 AVDictionary *in_fmt_opts = NULL;
1772 uint8_t *avio_ctx_buffer = NULL;
1776 close_demux_for_component(pls);
1778 if (!(pls->ctx = avformat_alloc_context())) {
1779 ret = AVERROR(ENOMEM);
1783 avio_ctx_buffer = av_malloc(INITIAL_BUFFER_SIZE);
1784 if (!avio_ctx_buffer ) {
1785 ret = AVERROR(ENOMEM);
1786 avformat_free_context(pls->ctx);
1791 ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, NULL);
1793 ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, seek_data);
1795 pls->pb.seekable = 0;
1797 if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0)
1800 pls->ctx->flags = AVFMT_FLAG_CUSTOM_IO;
1801 pls->ctx->probesize = 1024 * 4;
1802 pls->ctx->max_analyze_duration = 4 * AV_TIME_BASE;
1803 ret = av_probe_input_buffer(&pls->pb, &in_fmt, "", NULL, 0, 0);
1805 av_log(s, AV_LOG_ERROR, "Error when loading first fragment, playlist %d\n", (int)pls->rep_idx);
1806 avformat_free_context(pls->ctx);
1811 pls->ctx->pb = &pls->pb;
1812 pls->ctx->io_open = nested_io_open;
1814 // provide additional information from mpd if available
1815 ret = avformat_open_input(&pls->ctx, "", in_fmt, &in_fmt_opts); //pls->init_section->url
1816 av_dict_free(&in_fmt_opts);
1819 if (pls->n_fragments) {
1820 #if FF_API_R_FRAME_RATE
1821 if (pls->framerate.den) {
1822 for (i = 0; i < pls->ctx->nb_streams; i++)
1823 pls->ctx->streams[i]->r_frame_rate = pls->framerate;
1827 ret = avformat_find_stream_info(pls->ctx, NULL);
1836 static int open_demux_for_component(AVFormatContext *s, struct representation *pls)
1842 pls->cur_seq_no = calc_cur_seg_no(s, pls);
1844 if (!pls->last_seq_no) {
1845 pls->last_seq_no = calc_max_seg_no(pls, s->priv_data);
1848 ret = reopen_demux_for_component(s, pls);
1852 for (i = 0; i < pls->ctx->nb_streams; i++) {
1853 AVStream *st = avformat_new_stream(s, NULL);
1854 AVStream *ist = pls->ctx->streams[i];
1856 ret = AVERROR(ENOMEM);
1860 avcodec_parameters_copy(st->codecpar, pls->ctx->streams[i]->codecpar);
1861 avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den);
1869 static int is_common_init_section_exist(struct representation **pls, int n_pls)
1871 struct fragment *first_init_section = pls[0]->init_section;
1873 int64_t url_offset = -1;
1877 if (first_init_section == NULL || n_pls == 0)
1880 url = first_init_section->url;
1881 url_offset = first_init_section->url_offset;
1882 size = pls[0]->init_section->size;
1883 for (i=0;i<n_pls;i++) {
1884 if (av_strcasecmp(pls[i]->init_section->url,url) || pls[i]->init_section->url_offset != url_offset || pls[i]->init_section->size != size) {
1891 static void copy_init_section(struct representation *rep_dest, struct representation *rep_src)
1893 rep_dest->init_sec_buf = av_mallocz(rep_src->init_sec_buf_size);
1894 memcpy(rep_dest->init_sec_buf, rep_src->init_sec_buf, rep_src->init_sec_data_len);
1895 rep_dest->init_sec_buf_size = rep_src->init_sec_buf_size;
1896 rep_dest->init_sec_data_len = rep_src->init_sec_data_len;
1897 rep_dest->cur_timestamp = rep_src->cur_timestamp;
1901 static int dash_read_header(AVFormatContext *s)
1903 DASHContext *c = s->priv_data;
1905 int stream_index = 0;
1908 c->interrupt_callback = &s->interrupt_callback;
1910 if ((ret = save_avio_options(s)) < 0)
1913 av_dict_set(&c->avio_opts, "seekable", "0", 0);
1915 if ((ret = parse_manifest(s, s->url, s->pb)) < 0)
1918 /* If this isn't a live stream, fill the total duration of the
1921 s->duration = (int64_t) c->media_presentation_duration * AV_TIME_BASE;
1925 c->is_init_section_common_video = is_common_init_section_exist(c->videos, c->n_videos);
1927 /* Open the demuxer for video and audio components if available */
1928 for (i = 0; i < c->n_videos; i++) {
1929 struct representation *cur_video = c->videos[i];
1930 if (i > 0 && c->is_init_section_common_video) {
1931 copy_init_section(cur_video,c->videos[0]);
1933 ret = open_demux_for_component(s, cur_video);
1937 cur_video->stream_index = stream_index;
1942 c->is_init_section_common_audio = is_common_init_section_exist(c->audios, c->n_audios);
1944 for (i = 0; i < c->n_audios; i++) {
1945 struct representation *cur_audio = c->audios[i];
1946 if (i > 0 && c->is_init_section_common_audio) {
1947 copy_init_section(cur_audio,c->audios[0]);
1949 ret = open_demux_for_component(s, cur_audio);
1953 cur_audio->stream_index = stream_index;
1957 if (!stream_index) {
1958 ret = AVERROR_INVALIDDATA;
1962 /* Create a program */
1965 program = av_new_program(s, 0);
1970 for (i = 0; i < c->n_videos; i++) {
1971 struct representation *pls = c->videos[i];
1973 av_program_add_stream_index(s, 0, pls->stream_index);
1974 pls->assoc_stream = s->streams[pls->stream_index];
1975 if (pls->bandwidth > 0)
1976 av_dict_set_int(&pls->assoc_stream->metadata, "variant_bitrate", pls->bandwidth, 0);
1978 av_dict_set(&pls->assoc_stream->metadata, "id", pls->id, 0);
1980 for (i = 0; i < c->n_audios; i++) {
1981 struct representation *pls = c->audios[i];
1983 av_program_add_stream_index(s, 0, pls->stream_index);
1984 pls->assoc_stream = s->streams[pls->stream_index];
1985 if (pls->bandwidth > 0)
1986 av_dict_set_int(&pls->assoc_stream->metadata, "variant_bitrate", pls->bandwidth, 0);
1988 av_dict_set(&pls->assoc_stream->metadata, "id", pls->id, 0);
1997 static void recheck_discard_flags(AVFormatContext *s, struct representation **p, int n)
2001 for (i = 0; i < n; i++) {
2002 struct representation *pls = p[i];
2004 int needed = !pls->assoc_stream || pls->assoc_stream->discard < AVDISCARD_ALL;
2005 if (needed && !pls->ctx) {
2006 pls->cur_seg_offset = 0;
2007 pls->init_sec_buf_read_offset = 0;
2009 for (j = 0; j < n; j++) {
2010 pls->cur_seq_no = FFMAX(pls->cur_seq_no, p[j]->cur_seq_no);
2012 reopen_demux_for_component(s, pls);
2013 av_log(s, AV_LOG_INFO, "Now receiving stream_index %d\n", pls->stream_index);
2014 } else if (!needed && pls->ctx) {
2015 close_demux_for_component(pls);
2017 ff_format_io_close(pls->parent, &pls->input);
2018 av_log(s, AV_LOG_INFO, "No longer receiving stream_index %d\n", pls->stream_index);
2023 static int dash_read_packet(AVFormatContext *s, AVPacket *pkt)
2025 DASHContext *c = s->priv_data;
2028 struct representation *cur = NULL;
2030 recheck_discard_flags(s, c->videos, c->n_videos);
2031 recheck_discard_flags(s, c->audios, c->n_audios);
2033 for (i = 0; i < c->n_videos; i++) {
2034 struct representation *pls = c->videos[i];
2037 if (!cur || pls->cur_timestamp < mints) {
2039 mints = pls->cur_timestamp;
2042 for (i = 0; i < c->n_audios; i++) {
2043 struct representation *pls = c->audios[i];
2046 if (!cur || pls->cur_timestamp < mints) {
2048 mints = pls->cur_timestamp;
2053 return AVERROR_INVALIDDATA;
2055 while (!ff_check_interrupt(c->interrupt_callback) && !ret) {
2056 ret = av_read_frame(cur->ctx, pkt);
2058 /* If we got a packet, return it */
2059 cur->cur_timestamp = av_rescale(pkt->pts, (int64_t)cur->ctx->streams[0]->time_base.num * 90000, cur->ctx->streams[0]->time_base.den);
2060 pkt->stream_index = cur->stream_index;
2063 if (cur->is_restart_needed) {
2064 cur->cur_seg_offset = 0;
2065 cur->init_sec_buf_read_offset = 0;
2067 ff_format_io_close(cur->parent, &cur->input);
2068 ret = reopen_demux_for_component(s, cur);
2069 cur->is_restart_needed = 0;
2075 static int dash_close(AVFormatContext *s)
2077 DASHContext *c = s->priv_data;
2081 av_dict_free(&c->avio_opts);
2082 av_freep(&c->base_url);
2086 static int dash_seek(AVFormatContext *s, struct representation *pls, int64_t seek_pos_msec, int flags, int dry_run)
2091 int64_t duration = 0;
2093 av_log(pls->parent, AV_LOG_VERBOSE, "DASH seek pos[%"PRId64"ms], playlist %d%s\n",
2094 seek_pos_msec, pls->rep_idx, dry_run ? " (dry)" : "");
2096 // single fragment mode
2097 if (pls->n_fragments == 1) {
2098 pls->cur_timestamp = 0;
2099 pls->cur_seg_offset = 0;
2102 ff_read_frame_flush(pls->ctx);
2103 return av_seek_frame(pls->ctx, -1, seek_pos_msec * 1000, flags);
2107 ff_format_io_close(pls->parent, &pls->input);
2109 // find the nearest fragment
2110 if (pls->n_timelines > 0 && pls->fragment_timescale > 0) {
2111 int64_t num = pls->first_seq_no;
2112 av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline start n_timelines[%d] "
2113 "last_seq_no[%"PRId64"], playlist %d.\n",
2114 (int)pls->n_timelines, (int64_t)pls->last_seq_no, (int)pls->rep_idx);
2115 for (i = 0; i < pls->n_timelines; i++) {
2116 if (pls->timelines[i]->starttime > 0) {
2117 duration = pls->timelines[i]->starttime;
2119 duration += pls->timelines[i]->duration;
2120 if (seek_pos_msec < ((duration * 1000) / pls->fragment_timescale)) {
2123 for (j = 0; j < pls->timelines[i]->repeat; j++) {
2124 duration += pls->timelines[i]->duration;
2126 if (seek_pos_msec < ((duration * 1000) / pls->fragment_timescale)) {
2134 pls->cur_seq_no = num > pls->last_seq_no ? pls->last_seq_no : num;
2135 av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline end cur_seq_no[%"PRId64"], playlist %d.\n",
2136 (int64_t)pls->cur_seq_no, (int)pls->rep_idx);
2137 } else if (pls->fragment_duration > 0) {
2138 pls->cur_seq_no = pls->first_seq_no + ((seek_pos_msec * pls->fragment_timescale) / pls->fragment_duration) / 1000;
2140 av_log(pls->parent, AV_LOG_ERROR, "dash_seek missing timeline or fragment_duration\n");
2141 pls->cur_seq_no = pls->first_seq_no;
2143 pls->cur_timestamp = 0;
2144 pls->cur_seg_offset = 0;
2145 pls->init_sec_buf_read_offset = 0;
2146 ret = dry_run ? 0 : reopen_demux_for_component(s, pls);
2151 static int dash_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
2154 DASHContext *c = s->priv_data;
2155 int64_t seek_pos_msec = av_rescale_rnd(timestamp, 1000,
2156 s->streams[stream_index]->time_base.den,
2157 flags & AVSEEK_FLAG_BACKWARD ?
2158 AV_ROUND_DOWN : AV_ROUND_UP);
2159 if ((flags & AVSEEK_FLAG_BYTE) || c->is_live)
2160 return AVERROR(ENOSYS);
2162 /* Seek in discarded streams with dry_run=1 to avoid reopening them */
2163 for (i = 0; i < c->n_videos; i++) {
2165 ret = dash_seek(s, c->videos[i], seek_pos_msec, flags, !c->videos[i]->ctx);
2167 for (i = 0; i < c->n_audios; i++) {
2169 ret = dash_seek(s, c->audios[i], seek_pos_msec, flags, !c->audios[i]->ctx);
2175 static int dash_probe(AVProbeData *p)
2177 if (!av_stristr(p->buf, "<MPD"))
2180 if (av_stristr(p->buf, "dash:profile:isoff-on-demand:2011") ||
2181 av_stristr(p->buf, "dash:profile:isoff-live:2011") ||
2182 av_stristr(p->buf, "dash:profile:isoff-live:2012") ||
2183 av_stristr(p->buf, "dash:profile:isoff-main:2011")) {
2184 return AVPROBE_SCORE_MAX;
2186 if (av_stristr(p->buf, "dash:profile")) {
2187 return AVPROBE_SCORE_MAX;
2193 #define OFFSET(x) offsetof(DASHContext, x)
2194 #define FLAGS AV_OPT_FLAG_DECODING_PARAM
2195 static const AVOption dash_options[] = {
2196 {"allowed_extensions", "List of file extensions that dash is allowed to access",
2197 OFFSET(allowed_extensions), AV_OPT_TYPE_STRING,
2198 {.str = "aac,m4a,m4s,m4v,mov,mp4"},
2199 INT_MIN, INT_MAX, FLAGS},
2203 static const AVClass dash_class = {
2204 .class_name = "dash",
2205 .item_name = av_default_item_name,
2206 .option = dash_options,
2207 .version = LIBAVUTIL_VERSION_INT,
2210 AVInputFormat ff_dash_demuxer = {
2212 .long_name = NULL_IF_CONFIG_SMALL("Dynamic Adaptive Streaming over HTTP"),
2213 .priv_class = &dash_class,
2214 .priv_data_size = sizeof(DASHContext),
2215 .read_probe = dash_probe,
2216 .read_header = dash_read_header,
2217 .read_packet = dash_read_packet,
2218 .read_close = dash_close,
2219 .read_seek = dash_read_seek,
2220 .flags = AVFMT_NO_BYTE_SEEK,