/* * Dynamic Adaptive Streaming over HTTP demux * Copyright (c) 2017 samsamsam@o2.pl based on HLS demux * Copyright (c) 2017 Steven Liu * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include #include #include "libavutil/bprint.h" #include "libavutil/opt.h" #include "libavutil/time.h" #include "libavutil/parseutils.h" #include "internal.h" #include "avio_internal.h" #include "dash.h" #include "demux.h" #include "url.h" #define INITIAL_BUFFER_SIZE 32768 struct fragment { int64_t url_offset; int64_t size; char *url; }; /* * reference to : ISO_IEC_23009-1-DASH-2012 * Section: 5.3.9.6.2 * Table: Table 17 — Semantics of SegmentTimeline element * */ struct timeline { /* starttime: Element or Attribute Name * specifies the MPD start time, in @timescale units, * the first Segment in the series starts relative to the beginning of the Period. * The value of this attribute must be equal to or greater than the sum of the previous S * element earliest presentation time and the sum of the contiguous Segment durations. * If the value of the attribute is greater than what is expressed by the previous S element, * it expresses discontinuities in the timeline. * If not present then the value shall be assumed to be zero for the first S element * and for the subsequent S elements, the value shall be assumed to be the sum of * the previous S element's earliest presentation time and contiguous duration * (i.e. previous S@starttime + @duration * (@repeat + 1)). * */ int64_t starttime; /* repeat: Element or Attribute Name * specifies the repeat count of the number of following contiguous Segments with * the same duration expressed by the value of @duration. This value is zero-based * (e.g. a value of three means four Segments in the contiguous series). * */ int64_t repeat; /* duration: Element or Attribute Name * specifies the Segment duration, in units of the value of the @timescale. * */ int64_t duration; }; /* * Each playlist has its own demuxer. If it is currently active, * it has an opened AVIOContext too, and potentially an AVPacket * containing the next packet from this stream. */ struct representation { char *url_template; FFIOContext pb; AVIOContext *input; AVFormatContext *parent; AVFormatContext *ctx; int stream_index; char *id; char *lang; int bandwidth; AVRational framerate; AVStream *assoc_stream; /* demuxer stream associated with this representation */ int n_fragments; struct fragment **fragments; /* VOD list of fragment for profile */ int n_timelines; struct timeline **timelines; int64_t first_seq_no; int64_t last_seq_no; int64_t start_number; /* used in case when we have dynamic list of segment to know which segments are new one*/ int64_t fragment_duration; int64_t fragment_timescale; int64_t presentation_timeoffset; int64_t cur_seq_no; int64_t cur_seg_offset; int64_t cur_seg_size; struct fragment *cur_seg; /* Currently active Media Initialization Section */ struct fragment *init_section; uint8_t *init_sec_buf; uint32_t init_sec_buf_size; uint32_t init_sec_data_len; uint32_t init_sec_buf_read_offset; int64_t cur_timestamp; int is_restart_needed; }; typedef struct DASHContext { const AVClass *class; char *base_url; int n_videos; struct representation **videos; int n_audios; struct representation **audios; int n_subtitles; struct representation **subtitles; /* MediaPresentationDescription Attribute */ uint64_t media_presentation_duration; uint64_t suggested_presentation_delay; uint64_t availability_start_time; uint64_t availability_end_time; uint64_t publish_time; uint64_t minimum_update_period; uint64_t time_shift_buffer_depth; uint64_t min_buffer_time; /* Period Attribute */ uint64_t period_duration; uint64_t period_start; /* AdaptationSet Attribute */ char *adaptionset_lang; int is_live; AVIOInterruptCB *interrupt_callback; char *allowed_extensions; AVDictionary *avio_opts; int max_url_size; char *cenc_decryption_key; /* Flags for init section*/ int is_init_section_common_video; int is_init_section_common_audio; int is_init_section_common_subtitle; } DASHContext; static int ishttp(char *url) { const char *proto_name = avio_find_protocol_name(url); return proto_name && av_strstart(proto_name, "http", NULL); } static int aligned(int val) { return ((val + 0x3F) >> 6) << 6; } static uint64_t get_current_time_in_sec(void) { return av_gettime() / 1000000; } static uint64_t get_utc_date_time_insec(AVFormatContext *s, const char *datetime) { struct tm timeinfo; int year = 0; int month = 0; int day = 0; int hour = 0; int minute = 0; int ret = 0; float second = 0.0; /* ISO-8601 date parser */ if (!datetime) return 0; ret = sscanf(datetime, "%d-%d-%dT%d:%d:%fZ", &year, &month, &day, &hour, &minute, &second); /* year, month, day, hour, minute, second 6 arguments */ if (ret != 6) { av_log(s, AV_LOG_WARNING, "get_utc_date_time_insec get a wrong time format\n"); } timeinfo.tm_year = year - 1900; timeinfo.tm_mon = month - 1; timeinfo.tm_mday = day; timeinfo.tm_hour = hour; timeinfo.tm_min = minute; timeinfo.tm_sec = (int)second; return av_timegm(&timeinfo); } static uint32_t get_duration_insec(AVFormatContext *s, const char *duration) { /* ISO-8601 duration parser */ uint32_t days = 0; uint32_t hours = 0; uint32_t mins = 0; uint32_t secs = 0; int size = 0; float value = 0; char type = '\0'; const char *ptr = duration; while (*ptr) { if (*ptr == 'P' || *ptr == 'T') { ptr++; continue; } if (sscanf(ptr, "%f%c%n", &value, &type, &size) != 2) { av_log(s, AV_LOG_WARNING, "get_duration_insec get a wrong time format\n"); return 0; /* parser error */ } switch (type) { case 'D': days = (uint32_t)value; break; case 'H': hours = (uint32_t)value; break; case 'M': mins = (uint32_t)value; break; case 'S': secs = (uint32_t)value; break; default: // handle invalid type break; } ptr += size; } return ((days * 24 + hours) * 60 + mins) * 60 + secs; } static int64_t get_segment_start_time_based_on_timeline(struct representation *pls, int64_t cur_seq_no) { int64_t start_time = 0; int64_t i = 0; int64_t j = 0; int64_t num = 0; if (pls->n_timelines) { for (i = 0; i < pls->n_timelines; i++) { if (pls->timelines[i]->starttime > 0) { start_time = pls->timelines[i]->starttime; } if (num == cur_seq_no) goto finish; start_time += pls->timelines[i]->duration; if (pls->timelines[i]->repeat == -1) { start_time = pls->timelines[i]->duration * cur_seq_no; goto finish; } for (j = 0; j < pls->timelines[i]->repeat; j++) { num++; if (num == cur_seq_no) goto finish; start_time += pls->timelines[i]->duration; } num++; } } finish: return start_time; } static int64_t calc_next_seg_no_from_timelines(struct representation *pls, int64_t cur_time) { int64_t i = 0; int64_t j = 0; int64_t num = 0; int64_t start_time = 0; for (i = 0; i < pls->n_timelines; i++) { if (pls->timelines[i]->starttime > 0) { start_time = pls->timelines[i]->starttime; } if (start_time > cur_time) goto finish; start_time += pls->timelines[i]->duration; for (j = 0; j < pls->timelines[i]->repeat; j++) { num++; if (start_time > cur_time) goto finish; start_time += pls->timelines[i]->duration; } num++; } return -1; finish: return num; } static void free_fragment(struct fragment **seg) { if (!(*seg)) { return; } av_freep(&(*seg)->url); av_freep(seg); } static void free_fragment_list(struct representation *pls) { int i; for (i = 0; i < pls->n_fragments; i++) { free_fragment(&pls->fragments[i]); } av_freep(&pls->fragments); pls->n_fragments = 0; } static void free_timelines_list(struct representation *pls) { int i; for (i = 0; i < pls->n_timelines; i++) { av_freep(&pls->timelines[i]); } av_freep(&pls->timelines); pls->n_timelines = 0; } static void free_representation(struct representation *pls) { free_fragment_list(pls); free_timelines_list(pls); free_fragment(&pls->cur_seg); free_fragment(&pls->init_section); av_freep(&pls->init_sec_buf); av_freep(&pls->pb.pub.buffer); ff_format_io_close(pls->parent, &pls->input); if (pls->ctx) { pls->ctx->pb = NULL; avformat_close_input(&pls->ctx); } av_freep(&pls->url_template); av_freep(&pls->lang); av_freep(&pls->id); av_freep(&pls); } static void free_video_list(DASHContext *c) { int i; for (i = 0; i < c->n_videos; i++) { struct representation *pls = c->videos[i]; free_representation(pls); } av_freep(&c->videos); c->n_videos = 0; } static void free_audio_list(DASHContext *c) { int i; for (i = 0; i < c->n_audios; i++) { struct representation *pls = c->audios[i]; free_representation(pls); } av_freep(&c->audios); c->n_audios = 0; } static void free_subtitle_list(DASHContext *c) { int i; for (i = 0; i < c->n_subtitles; i++) { struct representation *pls = c->subtitles[i]; free_representation(pls); } av_freep(&c->subtitles); c->n_subtitles = 0; } static int open_url(AVFormatContext *s, AVIOContext **pb, const char *url, AVDictionary **opts, AVDictionary *opts2, int *is_http) { DASHContext *c = s->priv_data; AVDictionary *tmp = NULL; const char *proto_name = NULL; int proto_name_len; int ret; if (av_strstart(url, "crypto", NULL)) { if (url[6] == '+' || url[6] == ':') proto_name = avio_find_protocol_name(url + 7); } if (!proto_name) proto_name = avio_find_protocol_name(url); if (!proto_name) return AVERROR_INVALIDDATA; proto_name_len = strlen(proto_name); // only http(s) & file are allowed if (av_strstart(proto_name, "file", NULL)) { if (strcmp(c->allowed_extensions, "ALL") && !av_match_ext(url, c->allowed_extensions)) { av_log(s, AV_LOG_ERROR, "Filename extension of \'%s\' is not a common multimedia extension, blocked for security reasons.\n" "If you wish to override this adjust allowed_extensions, you can set it to \'ALL\' to allow all\n", url); return AVERROR_INVALIDDATA; } } else if (av_strstart(proto_name, "http", NULL)) { ; } else return AVERROR_INVALIDDATA; if (!strncmp(proto_name, url, proto_name_len) && url[proto_name_len] == ':') ; else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, proto_name_len) && url[7 + proto_name_len] == ':') ; else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5)) return AVERROR_INVALIDDATA; av_freep(pb); av_dict_copy(&tmp, *opts, 0); av_dict_copy(&tmp, opts2, 0); ret = avio_open2(pb, url, AVIO_FLAG_READ, c->interrupt_callback, &tmp); if (ret >= 0) { // update cookies on http response with setcookies. char *new_cookies = NULL; if (!(s->flags & AVFMT_FLAG_CUSTOM_IO)) av_opt_get(*pb, "cookies", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&new_cookies); if (new_cookies) { av_dict_set(opts, "cookies", new_cookies, AV_DICT_DONT_STRDUP_VAL); } } av_dict_free(&tmp); if (is_http) *is_http = av_strstart(proto_name, "http", NULL); return ret; } static char *get_content_url(xmlNodePtr *baseurl_nodes, int n_baseurl_nodes, int max_url_size, char *rep_id_val, char *rep_bandwidth_val, char *val) { int i; char *text; char *url = NULL; char *tmp_str = av_mallocz(max_url_size); if (!tmp_str) return NULL; for (i = 0; i < n_baseurl_nodes; ++i) { if (baseurl_nodes[i] && baseurl_nodes[i]->children && baseurl_nodes[i]->children->type == XML_TEXT_NODE) { text = xmlNodeGetContent(baseurl_nodes[i]->children); if (text) { memset(tmp_str, 0, max_url_size); ff_make_absolute_url(tmp_str, max_url_size, "", text); xmlFree(text); } } } if (val) ff_make_absolute_url(tmp_str, max_url_size, tmp_str, val); if (rep_id_val) { url = av_strireplace(tmp_str, "$RepresentationID$", rep_id_val); if (!url) { goto end; } av_strlcpy(tmp_str, url, max_url_size); } if (rep_bandwidth_val && tmp_str[0] != '\0') { // free any previously assigned url before reassigning av_free(url); url = av_strireplace(tmp_str, "$Bandwidth$", rep_bandwidth_val); if (!url) { goto end; } } end: av_free(tmp_str); return url; } static char *get_val_from_nodes_tab(xmlNodePtr *nodes, const int n_nodes, const char *attrname) { int i; char *val; for (i = 0; i < n_nodes; ++i) { if (nodes[i]) { val = xmlGetProp(nodes[i], attrname); if (val) return val; } } return NULL; } static xmlNodePtr find_child_node_by_name(xmlNodePtr rootnode, const char *nodename) { xmlNodePtr node = rootnode; if (!node) { return NULL; } node = xmlFirstElementChild(node); while (node) { if (!av_strcasecmp(node->name, nodename)) { return node; } node = xmlNextElementSibling(node); } return NULL; } static enum AVMediaType get_content_type(xmlNodePtr node) { enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN; int i = 0; const char *attr; char *val = NULL; if (node) { for (i = 0; i < 2; i++) { attr = i ? "mimeType" : "contentType"; val = xmlGetProp(node, attr); if (val) { if (av_stristr(val, "video")) { type = AVMEDIA_TYPE_VIDEO; } else if (av_stristr(val, "audio")) { type = AVMEDIA_TYPE_AUDIO; } else if (av_stristr(val, "text")) { type = AVMEDIA_TYPE_SUBTITLE; } xmlFree(val); } } } return type; } static struct fragment * get_Fragment(char *range) { struct fragment * seg = av_mallocz(sizeof(struct fragment)); if (!seg) return NULL; seg->size = -1; if (range) { char *str_end_offset; char *str_offset = av_strtok(range, "-", &str_end_offset); seg->url_offset = strtoll(str_offset, NULL, 10); seg->size = strtoll(str_end_offset, NULL, 10) - seg->url_offset + 1; } return seg; } static int parse_manifest_segmenturlnode(AVFormatContext *s, struct representation *rep, xmlNodePtr fragmenturl_node, xmlNodePtr *baseurl_nodes, char *rep_id_val, char *rep_bandwidth_val) { DASHContext *c = s->priv_data; char *initialization_val = NULL; char *media_val = NULL; char *range_val = NULL; int max_url_size = c ? c->max_url_size: MAX_URL_SIZE; int err; if (!av_strcasecmp(fragmenturl_node->name, "Initialization")) { initialization_val = xmlGetProp(fragmenturl_node, "sourceURL"); range_val = xmlGetProp(fragmenturl_node, "range"); if (initialization_val || range_val) { free_fragment(&rep->init_section); rep->init_section = get_Fragment(range_val); xmlFree(range_val); if (!rep->init_section) { xmlFree(initialization_val); return AVERROR(ENOMEM); } rep->init_section->url = get_content_url(baseurl_nodes, 4, max_url_size, rep_id_val, rep_bandwidth_val, initialization_val); xmlFree(initialization_val); if (!rep->init_section->url) { av_freep(&rep->init_section); return AVERROR(ENOMEM); } } } else if (!av_strcasecmp(fragmenturl_node->name, "SegmentURL")) { media_val = xmlGetProp(fragmenturl_node, "media"); range_val = xmlGetProp(fragmenturl_node, "mediaRange"); if (media_val || range_val) { struct fragment *seg = get_Fragment(range_val); xmlFree(range_val); if (!seg) { xmlFree(media_val); return AVERROR(ENOMEM); } seg->url = get_content_url(baseurl_nodes, 4, max_url_size, rep_id_val, rep_bandwidth_val, media_val); xmlFree(media_val); if (!seg->url) { av_free(seg); return AVERROR(ENOMEM); } err = av_dynarray_add_nofree(&rep->fragments, &rep->n_fragments, seg); if (err < 0) { free_fragment(&seg); return err; } } } return 0; } static int parse_manifest_segmenttimeline(AVFormatContext *s, struct representation *rep, xmlNodePtr fragment_timeline_node) { xmlAttrPtr attr = NULL; char *val = NULL; int err; if (!av_strcasecmp(fragment_timeline_node->name, "S")) { struct timeline *tml = av_mallocz(sizeof(struct timeline)); if (!tml) { return AVERROR(ENOMEM); } attr = fragment_timeline_node->properties; while (attr) { val = xmlGetProp(fragment_timeline_node, attr->name); if (!val) { av_log(s, AV_LOG_WARNING, "parse_manifest_segmenttimeline attr->name = %s val is NULL\n", attr->name); continue; } if (!av_strcasecmp(attr->name, "t")) { tml->starttime = (int64_t)strtoll(val, NULL, 10); } else if (!av_strcasecmp(attr->name, "r")) { tml->repeat =(int64_t) strtoll(val, NULL, 10); } else if (!av_strcasecmp(attr->name, "d")) { tml->duration = (int64_t)strtoll(val, NULL, 10); } attr = attr->next; xmlFree(val); } err = av_dynarray_add_nofree(&rep->timelines, &rep->n_timelines, tml); if (err < 0) { av_free(tml); return err; } } return 0; } static int resolve_content_path(AVFormatContext *s, const char *url, int *max_url_size, xmlNodePtr *baseurl_nodes, int n_baseurl_nodes) { char *tmp_str = NULL; char *path = NULL; char *mpdName = NULL; xmlNodePtr node = NULL; char *baseurl = NULL; char *root_url = NULL; char *text = NULL; char *tmp = NULL; int isRootHttp = 0; char token ='/'; int start = 0; int rootId = 0; int updated = 0; int size = 0; int i; int tmp_max_url_size = strlen(url); for (i = n_baseurl_nodes-1; i >= 0 ; i--) { text = xmlNodeGetContent(baseurl_nodes[i]); if (!text) continue; tmp_max_url_size += strlen(text); if (ishttp(text)) { xmlFree(text); break; } xmlFree(text); } tmp_max_url_size = aligned(tmp_max_url_size); text = av_mallocz(tmp_max_url_size); if (!text) { updated = AVERROR(ENOMEM); goto end; } av_strlcpy(text, url, strlen(url)+1); tmp = text; while (mpdName = av_strtok(tmp, "/", &tmp)) { size = strlen(mpdName); } av_free(text); path = av_mallocz(tmp_max_url_size); tmp_str = av_mallocz(tmp_max_url_size); if (!tmp_str || !path) { updated = AVERROR(ENOMEM); goto end; } av_strlcpy (path, url, strlen(url) - size + 1); for (rootId = n_baseurl_nodes - 1; rootId > 0; rootId --) { if (!(node = baseurl_nodes[rootId])) { continue; } text = xmlNodeGetContent(node); if (ishttp(text)) { xmlFree(text); break; } xmlFree(text); } node = baseurl_nodes[rootId]; baseurl = xmlNodeGetContent(node); root_url = (av_strcasecmp(baseurl, "")) ? baseurl : path; if (node) { xmlNodeSetContent(node, root_url); updated = 1; } size = strlen(root_url); isRootHttp = ishttp(root_url); if (size > 0 && root_url[size - 1] != token) { av_strlcat(root_url, "/", size + 2); size += 2; } for (i = 0; i < n_baseurl_nodes; ++i) { if (i == rootId) { continue; } text = xmlNodeGetContent(baseurl_nodes[i]); if (text && !av_strstart(text, "/", NULL)) { memset(tmp_str, 0, strlen(tmp_str)); if (!ishttp(text) && isRootHttp) { av_strlcpy(tmp_str, root_url, size + 1); } start = (text[0] == token); if (start && av_stristr(tmp_str, text)) { char *p = tmp_str; if (!av_strncasecmp(tmp_str, "http://", 7)) { p += 7; } else if (!av_strncasecmp(tmp_str, "https://", 8)) { p += 8; } p = strchr(p, '/'); memset(p + 1, 0, strlen(p)); } av_strlcat(tmp_str, text + start, tmp_max_url_size); xmlNodeSetContent(baseurl_nodes[i], tmp_str); updated = 1; xmlFree(text); } } end: if (tmp_max_url_size > *max_url_size) { *max_url_size = tmp_max_url_size; } av_free(path); av_free(tmp_str); xmlFree(baseurl); return updated; } static int parse_manifest_representation(AVFormatContext *s, const char *url, xmlNodePtr node, xmlNodePtr adaptionset_node, xmlNodePtr mpd_baseurl_node, xmlNodePtr period_baseurl_node, xmlNodePtr period_segmenttemplate_node, xmlNodePtr period_segmentlist_node, xmlNodePtr fragment_template_node, xmlNodePtr content_component_node, xmlNodePtr adaptionset_baseurl_node, xmlNodePtr adaptionset_segmentlist_node, xmlNodePtr adaptionset_supplementalproperty_node) { int32_t ret = 0; DASHContext *c = s->priv_data; struct representation *rep = NULL; struct fragment *seg = NULL; xmlNodePtr representation_segmenttemplate_node = NULL; xmlNodePtr representation_baseurl_node = NULL; xmlNodePtr representation_segmentlist_node = NULL; xmlNodePtr segmentlists_tab[3]; xmlNodePtr fragment_timeline_node = NULL; xmlNodePtr fragment_templates_tab[5]; char *val = NULL; xmlNodePtr baseurl_nodes[4]; xmlNodePtr representation_node = node; char *rep_bandwidth_val; enum AVMediaType type = AVMEDIA_TYPE_UNKNOWN; // try get information from representation if (type == AVMEDIA_TYPE_UNKNOWN) type = get_content_type(representation_node); // try get information from contentComponen if (type == AVMEDIA_TYPE_UNKNOWN) type = get_content_type(content_component_node); // try get information from adaption set if (type == AVMEDIA_TYPE_UNKNOWN) type = get_content_type(adaptionset_node); if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO && type != AVMEDIA_TYPE_SUBTITLE) { av_log(s, AV_LOG_VERBOSE, "Parsing '%s' - skipp not supported representation type\n", url); return 0; } // convert selected representation to our internal struct rep = av_mallocz(sizeof(struct representation)); if (!rep) return AVERROR(ENOMEM); if (c->adaptionset_lang) { rep->lang = av_strdup(c->adaptionset_lang); if (!rep->lang) { av_log(s, AV_LOG_ERROR, "alloc language memory failure\n"); av_freep(&rep); return AVERROR(ENOMEM); } } rep->parent = s; representation_segmenttemplate_node = find_child_node_by_name(representation_node, "SegmentTemplate"); representation_baseurl_node = find_child_node_by_name(representation_node, "BaseURL"); representation_segmentlist_node = find_child_node_by_name(representation_node, "SegmentList"); rep_bandwidth_val = xmlGetProp(representation_node, "bandwidth"); val = xmlGetProp(representation_node, "id"); if (val) { rep->id = av_strdup(val); xmlFree(val); if (!rep->id) goto enomem; } baseurl_nodes[0] = mpd_baseurl_node; baseurl_nodes[1] = period_baseurl_node; baseurl_nodes[2] = adaptionset_baseurl_node; baseurl_nodes[3] = representation_baseurl_node; ret = resolve_content_path(s, url, &c->max_url_size, baseurl_nodes, 4); c->max_url_size = aligned(c->max_url_size + (rep->id ? strlen(rep->id) : 0) + (rep_bandwidth_val ? strlen(rep_bandwidth_val) : 0)); if (ret == AVERROR(ENOMEM) || ret == 0) goto free; if (representation_segmenttemplate_node || fragment_template_node || period_segmenttemplate_node) { fragment_timeline_node = NULL; fragment_templates_tab[0] = representation_segmenttemplate_node; fragment_templates_tab[1] = adaptionset_segmentlist_node; fragment_templates_tab[2] = fragment_template_node; fragment_templates_tab[3] = period_segmenttemplate_node; fragment_templates_tab[4] = period_segmentlist_node; val = get_val_from_nodes_tab(fragment_templates_tab, 4, "initialization"); if (val) { rep->init_section = av_mallocz(sizeof(struct fragment)); if (!rep->init_section) { xmlFree(val); goto enomem; } c->max_url_size = aligned(c->max_url_size + strlen(val)); rep->init_section->url = get_content_url(baseurl_nodes, 4, c->max_url_size, rep->id, rep_bandwidth_val, val); xmlFree(val); if (!rep->init_section->url) goto enomem; rep->init_section->size = -1; } val = get_val_from_nodes_tab(fragment_templates_tab, 4, "media"); if (val) { c->max_url_size = aligned(c->max_url_size + strlen(val)); rep->url_template = get_content_url(baseurl_nodes, 4, c->max_url_size, rep->id, rep_bandwidth_val, val); xmlFree(val); } val = get_val_from_nodes_tab(fragment_templates_tab, 4, "presentationTimeOffset"); if (val) { rep->presentation_timeoffset = (int64_t) strtoll(val, NULL, 10); av_log(s, AV_LOG_TRACE, "rep->presentation_timeoffset = [%"PRId64"]\n", rep->presentation_timeoffset); xmlFree(val); } val = get_val_from_nodes_tab(fragment_templates_tab, 4, "duration"); if (val) { rep->fragment_duration = (int64_t) strtoll(val, NULL, 10); av_log(s, AV_LOG_TRACE, "rep->fragment_duration = [%"PRId64"]\n", rep->fragment_duration); xmlFree(val); } val = get_val_from_nodes_tab(fragment_templates_tab, 4, "timescale"); if (val) { rep->fragment_timescale = (int64_t) strtoll(val, NULL, 10); av_log(s, AV_LOG_TRACE, "rep->fragment_timescale = [%"PRId64"]\n", rep->fragment_timescale); xmlFree(val); } val = get_val_from_nodes_tab(fragment_templates_tab, 4, "startNumber"); if (val) { rep->start_number = rep->first_seq_no = (int64_t) strtoll(val, NULL, 10); av_log(s, AV_LOG_TRACE, "rep->first_seq_no = [%"PRId64"]\n", rep->first_seq_no); xmlFree(val); } if (adaptionset_supplementalproperty_node) { char *scheme_id_uri = xmlGetProp(adaptionset_supplementalproperty_node, "schemeIdUri"); if (scheme_id_uri) { int is_last_segment_number = !av_strcasecmp(scheme_id_uri, "http://dashif.org/guidelines/last-segment-number"); xmlFree(scheme_id_uri); if (is_last_segment_number) { val = xmlGetProp(adaptionset_supplementalproperty_node, "value"); if (!val) { av_log(s, AV_LOG_ERROR, "Missing value attribute in adaptionset_supplementalproperty_node\n"); } else { rep->last_seq_no = (int64_t)strtoll(val, NULL, 10) - 1; xmlFree(val); } } } } fragment_timeline_node = find_child_node_by_name(representation_segmenttemplate_node, "SegmentTimeline"); if (!fragment_timeline_node) fragment_timeline_node = find_child_node_by_name(fragment_template_node, "SegmentTimeline"); if (!fragment_timeline_node) fragment_timeline_node = find_child_node_by_name(adaptionset_segmentlist_node, "SegmentTimeline"); if (!fragment_timeline_node) fragment_timeline_node = find_child_node_by_name(period_segmentlist_node, "SegmentTimeline"); if (fragment_timeline_node) { fragment_timeline_node = xmlFirstElementChild(fragment_timeline_node); while (fragment_timeline_node) { ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node); if (ret < 0) goto free; fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node); } } } else if (representation_baseurl_node && !representation_segmentlist_node) { seg = av_mallocz(sizeof(struct fragment)); if (!seg) goto enomem; ret = av_dynarray_add_nofree(&rep->fragments, &rep->n_fragments, seg); if (ret < 0) { av_free(seg); goto free; } seg->url = get_content_url(baseurl_nodes, 4, c->max_url_size, rep->id, rep_bandwidth_val, NULL); if (!seg->url) goto enomem; seg->size = -1; } else if (representation_segmentlist_node) { // TODO: https://www.brendanlong.com/the-structure-of-an-mpeg-dash-mpd.html // http://www-itec.uni-klu.ac.at/dash/ddash/mpdGenerator.php?fragmentlength=15&type=full xmlNodePtr fragmenturl_node = NULL; segmentlists_tab[0] = representation_segmentlist_node; segmentlists_tab[1] = adaptionset_segmentlist_node; segmentlists_tab[2] = period_segmentlist_node; val = get_val_from_nodes_tab(segmentlists_tab, 3, "duration"); if (val) { rep->fragment_duration = (int64_t) strtoll(val, NULL, 10); av_log(s, AV_LOG_TRACE, "rep->fragment_duration = [%"PRId64"]\n", rep->fragment_duration); xmlFree(val); } val = get_val_from_nodes_tab(segmentlists_tab, 3, "timescale"); if (val) { rep->fragment_timescale = (int64_t) strtoll(val, NULL, 10); av_log(s, AV_LOG_TRACE, "rep->fragment_timescale = [%"PRId64"]\n", rep->fragment_timescale); xmlFree(val); } val = get_val_from_nodes_tab(segmentlists_tab, 3, "startNumber"); if (val) { rep->start_number = rep->first_seq_no = (int64_t) strtoll(val, NULL, 10); av_log(s, AV_LOG_TRACE, "rep->first_seq_no = [%"PRId64"]\n", rep->first_seq_no); xmlFree(val); } fragmenturl_node = xmlFirstElementChild(representation_segmentlist_node); while (fragmenturl_node) { ret = parse_manifest_segmenturlnode(s, rep, fragmenturl_node, baseurl_nodes, rep->id, rep_bandwidth_val); if (ret < 0) goto free; fragmenturl_node = xmlNextElementSibling(fragmenturl_node); } fragment_timeline_node = find_child_node_by_name(adaptionset_segmentlist_node, "SegmentTimeline"); if (!fragment_timeline_node) fragment_timeline_node = find_child_node_by_name(period_segmentlist_node, "SegmentTimeline"); if (fragment_timeline_node) { fragment_timeline_node = xmlFirstElementChild(fragment_timeline_node); while (fragment_timeline_node) { ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node); if (ret < 0) goto free; fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node); } } } else { av_log(s, AV_LOG_ERROR, "Unknown format of Representation node id '%s' \n", rep->id ? rep->id : ""); goto free; } if (rep->fragment_duration > 0 && !rep->fragment_timescale) rep->fragment_timescale = 1; rep->bandwidth = rep_bandwidth_val ? atoi(rep_bandwidth_val) : 0; rep->framerate = av_make_q(0, 0); if (type == AVMEDIA_TYPE_VIDEO) { char *rep_framerate_val = xmlGetProp(representation_node, "frameRate"); if (rep_framerate_val) { ret = av_parse_video_rate(&rep->framerate, rep_framerate_val); if (ret < 0) av_log(s, AV_LOG_VERBOSE, "Ignoring invalid frame rate '%s'\n", rep_framerate_val); xmlFree(rep_framerate_val); } } switch (type) { case AVMEDIA_TYPE_VIDEO: ret = av_dynarray_add_nofree(&c->videos, &c->n_videos, rep); break; case AVMEDIA_TYPE_AUDIO: ret = av_dynarray_add_nofree(&c->audios, &c->n_audios, rep); break; case AVMEDIA_TYPE_SUBTITLE: ret = av_dynarray_add_nofree(&c->subtitles, &c->n_subtitles, rep); break; } if (ret < 0) goto free; end: if (rep_bandwidth_val) xmlFree(rep_bandwidth_val); return ret; enomem: ret = AVERROR(ENOMEM); free: free_representation(rep); goto end; } static int parse_manifest_adaptationset_attr(AVFormatContext *s, xmlNodePtr adaptionset_node) { DASHContext *c = s->priv_data; if (!adaptionset_node) { av_log(s, AV_LOG_WARNING, "Cannot get AdaptionSet\n"); return AVERROR(EINVAL); } c->adaptionset_lang = xmlGetProp(adaptionset_node, "lang"); return 0; } static int parse_manifest_adaptationset(AVFormatContext *s, const char *url, xmlNodePtr adaptionset_node, xmlNodePtr mpd_baseurl_node, xmlNodePtr period_baseurl_node, xmlNodePtr period_segmenttemplate_node, xmlNodePtr period_segmentlist_node) { int ret = 0; DASHContext *c = s->priv_data; xmlNodePtr fragment_template_node = NULL; xmlNodePtr content_component_node = NULL; xmlNodePtr adaptionset_baseurl_node = NULL; xmlNodePtr adaptionset_segmentlist_node = NULL; xmlNodePtr adaptionset_supplementalproperty_node = NULL; xmlNodePtr node = NULL; ret = parse_manifest_adaptationset_attr(s, adaptionset_node); if (ret < 0) return ret; node = xmlFirstElementChild(adaptionset_node); while (node) { if (!av_strcasecmp(node->name, "SegmentTemplate")) { fragment_template_node = node; } else if (!av_strcasecmp(node->name, "ContentComponent")) { content_component_node = node; } else if (!av_strcasecmp(node->name, "BaseURL")) { adaptionset_baseurl_node = node; } else if (!av_strcasecmp(node->name, "SegmentList")) { adaptionset_segmentlist_node = node; } else if (!av_strcasecmp(node->name, "SupplementalProperty")) { adaptionset_supplementalproperty_node = node; } else if (!av_strcasecmp(node->name, "Representation")) { ret = parse_manifest_representation(s, url, node, adaptionset_node, mpd_baseurl_node, period_baseurl_node, period_segmenttemplate_node, period_segmentlist_node, fragment_template_node, content_component_node, adaptionset_baseurl_node, adaptionset_segmentlist_node, adaptionset_supplementalproperty_node); if (ret < 0) goto err; } node = xmlNextElementSibling(node); } err: xmlFree(c->adaptionset_lang); c->adaptionset_lang = NULL; return ret; } static int parse_programinformation(AVFormatContext *s, xmlNodePtr node) { xmlChar *val = NULL; node = xmlFirstElementChild(node); while (node) { if (!av_strcasecmp(node->name, "Title")) { val = xmlNodeGetContent(node); if (val) { av_dict_set(&s->metadata, "Title", val, 0); } } else if (!av_strcasecmp(node->name, "Source")) { val = xmlNodeGetContent(node); if (val) { av_dict_set(&s->metadata, "Source", val, 0); } } else if (!av_strcasecmp(node->name, "Copyright")) { val = xmlNodeGetContent(node); if (val) { av_dict_set(&s->metadata, "Copyright", val, 0); } } node = xmlNextElementSibling(node); xmlFree(val); val = NULL; } return 0; } static int parse_manifest(AVFormatContext *s, const char *url, AVIOContext *in) { DASHContext *c = s->priv_data; int ret = 0; int close_in = 0; AVBPrint buf; AVDictionary *opts = NULL; xmlDoc *doc = NULL; xmlNodePtr root_element = NULL; xmlNodePtr node = NULL; xmlNodePtr period_node = NULL; xmlNodePtr tmp_node = NULL; xmlNodePtr mpd_baseurl_node = NULL; xmlNodePtr period_baseurl_node = NULL; xmlNodePtr period_segmenttemplate_node = NULL; xmlNodePtr period_segmentlist_node = NULL; xmlNodePtr adaptionset_node = NULL; xmlAttrPtr attr = NULL; char *val = NULL; uint32_t period_duration_sec = 0; uint32_t period_start_sec = 0; if (!in) { close_in = 1; av_dict_copy(&opts, c->avio_opts, 0); ret = avio_open2(&in, url, AVIO_FLAG_READ, c->interrupt_callback, &opts); av_dict_free(&opts); if (ret < 0) return ret; } if (av_opt_get(in, "location", AV_OPT_SEARCH_CHILDREN, (uint8_t**)&c->base_url) < 0) c->base_url = av_strdup(url); av_bprint_init(&buf, 0, INT_MAX); // xmlReadMemory uses integer bufsize if ((ret = avio_read_to_bprint(in, &buf, SIZE_MAX)) < 0 || !avio_feof(in)) { av_log(s, AV_LOG_ERROR, "Unable to read to manifest '%s'\n", url); if (ret == 0) ret = AVERROR_INVALIDDATA; } else { LIBXML_TEST_VERSION doc = xmlReadMemory(buf.str, buf.len, c->base_url, NULL, 0); root_element = xmlDocGetRootElement(doc); node = root_element; if (!node) { ret = AVERROR_INVALIDDATA; av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing root node\n", url); goto cleanup; } if (node->type != XML_ELEMENT_NODE || av_strcasecmp(node->name, "MPD")) { ret = AVERROR_INVALIDDATA; av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - wrong root node name[%s] type[%d]\n", url, node->name, (int)node->type); goto cleanup; } val = xmlGetProp(node, "type"); if (!val) { av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing type attrib\n", url); ret = AVERROR_INVALIDDATA; goto cleanup; } if (!av_strcasecmp(val, "dynamic")) c->is_live = 1; xmlFree(val); attr = node->properties; while (attr) { val = xmlGetProp(node, attr->name); if (!av_strcasecmp(attr->name, "availabilityStartTime")) { c->availability_start_time = get_utc_date_time_insec(s, val); av_log(s, AV_LOG_TRACE, "c->availability_start_time = [%"PRId64"]\n", c->availability_start_time); } else if (!av_strcasecmp(attr->name, "availabilityEndTime")) { c->availability_end_time = get_utc_date_time_insec(s, val); av_log(s, AV_LOG_TRACE, "c->availability_end_time = [%"PRId64"]\n", c->availability_end_time); } else if (!av_strcasecmp(attr->name, "publishTime")) { c->publish_time = get_utc_date_time_insec(s, val); av_log(s, AV_LOG_TRACE, "c->publish_time = [%"PRId64"]\n", c->publish_time); } else if (!av_strcasecmp(attr->name, "minimumUpdatePeriod")) { c->minimum_update_period = get_duration_insec(s, val); av_log(s, AV_LOG_TRACE, "c->minimum_update_period = [%"PRId64"]\n", c->minimum_update_period); } else if (!av_strcasecmp(attr->name, "timeShiftBufferDepth")) { c->time_shift_buffer_depth = get_duration_insec(s, val); av_log(s, AV_LOG_TRACE, "c->time_shift_buffer_depth = [%"PRId64"]\n", c->time_shift_buffer_depth); } else if (!av_strcasecmp(attr->name, "minBufferTime")) { c->min_buffer_time = get_duration_insec(s, val); av_log(s, AV_LOG_TRACE, "c->min_buffer_time = [%"PRId64"]\n", c->min_buffer_time); } else if (!av_strcasecmp(attr->name, "suggestedPresentationDelay")) { c->suggested_presentation_delay = get_duration_insec(s, val); av_log(s, AV_LOG_TRACE, "c->suggested_presentation_delay = [%"PRId64"]\n", c->suggested_presentation_delay); } else if (!av_strcasecmp(attr->name, "mediaPresentationDuration")) { c->media_presentation_duration = get_duration_insec(s, val); av_log(s, AV_LOG_TRACE, "c->media_presentation_duration = [%"PRId64"]\n", c->media_presentation_duration); } attr = attr->next; xmlFree(val); } tmp_node = find_child_node_by_name(node, "BaseURL"); if (tmp_node) { mpd_baseurl_node = xmlCopyNode(tmp_node,1); } else { mpd_baseurl_node = xmlNewNode(NULL, "BaseURL"); } // at now we can handle only one period, with the longest duration node = xmlFirstElementChild(node); while (node) { if (!av_strcasecmp(node->name, "Period")) { period_duration_sec = 0; period_start_sec = 0; attr = node->properties; while (attr) { val = xmlGetProp(node, attr->name); if (!av_strcasecmp(attr->name, "duration")) { period_duration_sec = get_duration_insec(s, val); } else if (!av_strcasecmp(attr->name, "start")) { period_start_sec = get_duration_insec(s, val); } attr = attr->next; xmlFree(val); } if ((period_duration_sec) >= (c->period_duration)) { period_node = node; c->period_duration = period_duration_sec; c->period_start = period_start_sec; if (c->period_start > 0) c->media_presentation_duration = c->period_duration; } } else if (!av_strcasecmp(node->name, "ProgramInformation")) { parse_programinformation(s, node); } node = xmlNextElementSibling(node); } if (!period_node) { av_log(s, AV_LOG_ERROR, "Unable to parse '%s' - missing Period node\n", url); ret = AVERROR_INVALIDDATA; goto cleanup; } adaptionset_node = xmlFirstElementChild(period_node); while (adaptionset_node) { if (!av_strcasecmp(adaptionset_node->name, "BaseURL")) { period_baseurl_node = adaptionset_node; } else if (!av_strcasecmp(adaptionset_node->name, "SegmentTemplate")) { period_segmenttemplate_node = adaptionset_node; } else if (!av_strcasecmp(adaptionset_node->name, "SegmentList")) { period_segmentlist_node = adaptionset_node; } else if (!av_strcasecmp(adaptionset_node->name, "AdaptationSet")) { parse_manifest_adaptationset(s, url, adaptionset_node, mpd_baseurl_node, period_baseurl_node, period_segmenttemplate_node, period_segmentlist_node); } adaptionset_node = xmlNextElementSibling(adaptionset_node); } cleanup: /*free the document */ xmlFreeDoc(doc); xmlCleanupParser(); xmlFreeNode(mpd_baseurl_node); } av_bprint_finalize(&buf, NULL); if (close_in) { avio_close(in); } return ret; } static int64_t calc_cur_seg_no(AVFormatContext *s, struct representation *pls) { DASHContext *c = s->priv_data; int64_t num = 0; int64_t start_time_offset = 0; if (c->is_live) { if (pls->n_fragments) { av_log(s, AV_LOG_TRACE, "in n_fragments mode\n"); num = pls->first_seq_no; } else if (pls->n_timelines) { av_log(s, AV_LOG_TRACE, "in n_timelines mode\n"); start_time_offset = get_segment_start_time_based_on_timeline(pls, 0xFFFFFFFF) - 60 * pls->fragment_timescale; // 60 seconds before end num = calc_next_seg_no_from_timelines(pls, start_time_offset); if (num == -1) num = pls->first_seq_no; else num += pls->first_seq_no; } else if (pls->fragment_duration){ av_log(s, AV_LOG_TRACE, "in fragment_duration mode fragment_timescale = %"PRId64", presentation_timeoffset = %"PRId64"\n", pls->fragment_timescale, pls->presentation_timeoffset); if (pls->presentation_timeoffset) { num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) * pls->fragment_timescale)-pls->presentation_timeoffset) / pls->fragment_duration - c->min_buffer_time; } else if (c->publish_time > 0 && !c->availability_start_time) { if (c->min_buffer_time) { num = pls->first_seq_no + (((c->publish_time + pls->fragment_duration) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration - c->min_buffer_time; } else { num = pls->first_seq_no + (((c->publish_time - c->time_shift_buffer_depth + pls->fragment_duration) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration; } } else { num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time) - c->suggested_presentation_delay) * pls->fragment_timescale) / pls->fragment_duration; } } } else { num = pls->first_seq_no; } return num; } static int64_t calc_min_seg_no(AVFormatContext *s, struct representation *pls) { DASHContext *c = s->priv_data; int64_t num = 0; if (c->is_live && pls->fragment_duration) { av_log(s, AV_LOG_TRACE, "in live mode\n"); 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; } else { num = pls->first_seq_no; } return num; } static int64_t calc_max_seg_no(struct representation *pls, DASHContext *c) { int64_t num = 0; if (pls->n_fragments) { num = pls->first_seq_no + pls->n_fragments - 1; } else if (pls->n_timelines) { int i = 0; num = pls->first_seq_no + pls->n_timelines - 1; for (i = 0; i < pls->n_timelines; i++) { if (pls->timelines[i]->repeat == -1) { int length_of_each_segment = pls->timelines[i]->duration / pls->fragment_timescale; num = c->period_duration / length_of_each_segment; } else { num += pls->timelines[i]->repeat; } } } else if (c->is_live && pls->fragment_duration) { num = pls->first_seq_no + (((get_current_time_in_sec() - c->availability_start_time)) * pls->fragment_timescale) / pls->fragment_duration; } else if (pls->fragment_duration) { num = pls->first_seq_no + av_rescale_rnd(1, c->media_presentation_duration * pls->fragment_timescale, pls->fragment_duration, AV_ROUND_UP); } return num; } static void move_timelines(struct representation *rep_src, struct representation *rep_dest, DASHContext *c) { if (rep_dest && rep_src ) { free_timelines_list(rep_dest); rep_dest->timelines = rep_src->timelines; rep_dest->n_timelines = rep_src->n_timelines; rep_dest->first_seq_no = rep_src->first_seq_no; rep_dest->last_seq_no = calc_max_seg_no(rep_dest, c); rep_src->timelines = NULL; rep_src->n_timelines = 0; rep_dest->cur_seq_no = rep_src->cur_seq_no; } } static void move_segments(struct representation *rep_src, struct representation *rep_dest, DASHContext *c) { if (rep_dest && rep_src ) { free_fragment_list(rep_dest); if (rep_src->start_number > (rep_dest->start_number + rep_dest->n_fragments)) rep_dest->cur_seq_no = 0; else rep_dest->cur_seq_no += rep_src->start_number - rep_dest->start_number; rep_dest->fragments = rep_src->fragments; rep_dest->n_fragments = rep_src->n_fragments; rep_dest->parent = rep_src->parent; rep_dest->last_seq_no = calc_max_seg_no(rep_dest, c); rep_src->fragments = NULL; rep_src->n_fragments = 0; } } static int refresh_manifest(AVFormatContext *s) { int ret = 0, i; DASHContext *c = s->priv_data; // save current context int n_videos = c->n_videos; struct representation **videos = c->videos; int n_audios = c->n_audios; struct representation **audios = c->audios; int n_subtitles = c->n_subtitles; struct representation **subtitles = c->subtitles; char *base_url = c->base_url; c->base_url = NULL; c->n_videos = 0; c->videos = NULL; c->n_audios = 0; c->audios = NULL; c->n_subtitles = 0; c->subtitles = NULL; ret = parse_manifest(s, s->url, NULL); if (ret) goto finish; if (c->n_videos != n_videos) { av_log(c, AV_LOG_ERROR, "new manifest has mismatched no. of video representations, %d -> %d\n", n_videos, c->n_videos); return AVERROR_INVALIDDATA; } if (c->n_audios != n_audios) { av_log(c, AV_LOG_ERROR, "new manifest has mismatched no. of audio representations, %d -> %d\n", n_audios, c->n_audios); return AVERROR_INVALIDDATA; } if (c->n_subtitles != n_subtitles) { av_log(c, AV_LOG_ERROR, "new manifest has mismatched no. of subtitles representations, %d -> %d\n", n_subtitles, c->n_subtitles); return AVERROR_INVALIDDATA; } for (i = 0; i < n_videos; i++) { struct representation *cur_video = videos[i]; struct representation *ccur_video = c->videos[i]; if (cur_video->timelines) { // calc current time int64_t currentTime = get_segment_start_time_based_on_timeline(cur_video, cur_video->cur_seq_no) / cur_video->fragment_timescale; // update segments ccur_video->cur_seq_no = calc_next_seg_no_from_timelines(ccur_video, currentTime * cur_video->fragment_timescale - 1); if (ccur_video->cur_seq_no >= 0) { move_timelines(ccur_video, cur_video, c); } } if (cur_video->fragments) { move_segments(ccur_video, cur_video, c); } } for (i = 0; i < n_audios; i++) { struct representation *cur_audio = audios[i]; struct representation *ccur_audio = c->audios[i]; if (cur_audio->timelines) { // calc current time int64_t currentTime = get_segment_start_time_based_on_timeline(cur_audio, cur_audio->cur_seq_no) / cur_audio->fragment_timescale; // update segments ccur_audio->cur_seq_no = calc_next_seg_no_from_timelines(ccur_audio, currentTime * cur_audio->fragment_timescale - 1); if (ccur_audio->cur_seq_no >= 0) { move_timelines(ccur_audio, cur_audio, c); } } if (cur_audio->fragments) { move_segments(ccur_audio, cur_audio, c); } } finish: // restore context if (c->base_url) av_free(base_url); else c->base_url = base_url; if (c->subtitles) free_subtitle_list(c); if (c->audios) free_audio_list(c); if (c->videos) free_video_list(c); c->n_subtitles = n_subtitles; c->subtitles = subtitles; c->n_audios = n_audios; c->audios = audios; c->n_videos = n_videos; c->videos = videos; return ret; } static struct fragment *get_current_fragment(struct representation *pls) { int64_t min_seq_no = 0; int64_t max_seq_no = 0; struct fragment *seg = NULL; struct fragment *seg_ptr = NULL; DASHContext *c = pls->parent->priv_data; while (( !ff_check_interrupt(c->interrupt_callback)&& pls->n_fragments > 0)) { if (pls->cur_seq_no < pls->n_fragments) { seg_ptr = pls->fragments[pls->cur_seq_no]; seg = av_mallocz(sizeof(struct fragment)); if (!seg) { return NULL; } seg->url = av_strdup(seg_ptr->url); if (!seg->url) { av_free(seg); return NULL; } seg->size = seg_ptr->size; seg->url_offset = seg_ptr->url_offset; return seg; } else if (c->is_live) { refresh_manifest(pls->parent); } else { break; } } if (c->is_live) { min_seq_no = calc_min_seg_no(pls->parent, pls); max_seq_no = calc_max_seg_no(pls, c); if (pls->timelines || pls->fragments) { refresh_manifest(pls->parent); } if (pls->cur_seq_no <= min_seq_no) { av_log(pls->parent, AV_LOG_VERBOSE, "old fragment: cur[%"PRId64"] min[%"PRId64"] max[%"PRId64"]\n", (int64_t)pls->cur_seq_no, min_seq_no, max_seq_no); pls->cur_seq_no = calc_cur_seg_no(pls->parent, pls); } else if (pls->cur_seq_no > max_seq_no) { av_log(pls->parent, AV_LOG_VERBOSE, "new fragment: min[%"PRId64"] max[%"PRId64"]\n", min_seq_no, max_seq_no); } seg = av_mallocz(sizeof(struct fragment)); if (!seg) { return NULL; } } else if (pls->cur_seq_no <= pls->last_seq_no) { seg = av_mallocz(sizeof(struct fragment)); if (!seg) { return NULL; } } if (seg) { char *tmpfilename; if (!pls->url_template) { av_log(pls->parent, AV_LOG_ERROR, "Cannot get fragment, missing template URL\n"); av_free(seg); return NULL; } tmpfilename = av_mallocz(c->max_url_size); if (!tmpfilename) { av_free(seg); return NULL; } 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)); seg->url = av_strireplace(pls->url_template, pls->url_template, tmpfilename); if (!seg->url) { av_log(pls->parent, AV_LOG_WARNING, "Unable to resolve template url '%s', try to use origin template\n", pls->url_template); seg->url = av_strdup(pls->url_template); if (!seg->url) { av_log(pls->parent, AV_LOG_ERROR, "Cannot resolve template url '%s'\n", pls->url_template); av_free(tmpfilename); av_free(seg); return NULL; } } av_free(tmpfilename); seg->size = -1; } return seg; } static int read_from_url(struct representation *pls, struct fragment *seg, uint8_t *buf, int buf_size) { int ret; /* limit read if the fragment was only a part of a file */ if (seg->size >= 0) buf_size = FFMIN(buf_size, pls->cur_seg_size - pls->cur_seg_offset); ret = avio_read(pls->input, buf, buf_size); if (ret > 0) pls->cur_seg_offset += ret; return ret; } static int open_input(DASHContext *c, struct representation *pls, struct fragment *seg) { AVDictionary *opts = NULL; char *url = NULL; int ret = 0; url = av_mallocz(c->max_url_size); if (!url) { ret = AVERROR(ENOMEM); goto cleanup; } if (seg->size >= 0) { /* try to restrict the HTTP request to the part we want * (if this is in fact a HTTP request) */ av_dict_set_int(&opts, "offset", seg->url_offset, 0); av_dict_set_int(&opts, "end_offset", seg->url_offset + seg->size, 0); } ff_make_absolute_url(url, c->max_url_size, c->base_url, seg->url); av_log(pls->parent, AV_LOG_VERBOSE, "DASH request for url '%s', offset %"PRId64"\n", url, seg->url_offset); ret = open_url(pls->parent, &pls->input, url, &c->avio_opts, opts, NULL); cleanup: av_free(url); av_dict_free(&opts); pls->cur_seg_offset = 0; pls->cur_seg_size = seg->size; return ret; } static int update_init_section(struct representation *pls) { static const int max_init_section_size = 1024 * 1024; DASHContext *c = pls->parent->priv_data; int64_t sec_size; int64_t urlsize; int ret; if (!pls->init_section || pls->init_sec_buf) return 0; ret = open_input(c, pls, pls->init_section); if (ret < 0) { av_log(pls->parent, AV_LOG_WARNING, "Failed to open an initialization section\n"); return ret; } if (pls->init_section->size >= 0) sec_size = pls->init_section->size; else if ((urlsize = avio_size(pls->input)) >= 0) sec_size = urlsize; else sec_size = max_init_section_size; av_log(pls->parent, AV_LOG_DEBUG, "Downloading an initialization section of size %"PRId64"\n", sec_size); sec_size = FFMIN(sec_size, max_init_section_size); av_fast_malloc(&pls->init_sec_buf, &pls->init_sec_buf_size, sec_size); ret = read_from_url(pls, pls->init_section, pls->init_sec_buf, pls->init_sec_buf_size); ff_format_io_close(pls->parent, &pls->input); if (ret < 0) return ret; pls->init_sec_data_len = ret; pls->init_sec_buf_read_offset = 0; return 0; } static int64_t seek_data(void *opaque, int64_t offset, int whence) { struct representation *v = opaque; if (v->n_fragments && !v->init_sec_data_len) { return avio_seek(v->input, offset, whence); } return AVERROR(ENOSYS); } static int read_data(void *opaque, uint8_t *buf, int buf_size) { int ret = 0; struct representation *v = opaque; DASHContext *c = v->parent->priv_data; restart: if (!v->input) { free_fragment(&v->cur_seg); v->cur_seg = get_current_fragment(v); if (!v->cur_seg) { ret = AVERROR_EOF; goto end; } /* load/update Media Initialization Section, if any */ ret = update_init_section(v); if (ret) goto end; ret = open_input(c, v, v->cur_seg); if (ret < 0) { if (ff_check_interrupt(c->interrupt_callback)) { ret = AVERROR_EXIT; goto end; } av_log(v->parent, AV_LOG_WARNING, "Failed to open fragment of playlist\n"); v->cur_seq_no++; goto restart; } } if (v->init_sec_buf_read_offset < v->init_sec_data_len) { /* Push init section out first before first actual fragment */ int copy_size = FFMIN(v->init_sec_data_len - v->init_sec_buf_read_offset, buf_size); memcpy(buf, v->init_sec_buf, copy_size); v->init_sec_buf_read_offset += copy_size; ret = copy_size; goto end; } /* check the v->cur_seg, if it is null, get current and double check if the new v->cur_seg*/ if (!v->cur_seg) { v->cur_seg = get_current_fragment(v); } if (!v->cur_seg) { ret = AVERROR_EOF; goto end; } ret = read_from_url(v, v->cur_seg, buf, buf_size); if (ret > 0) goto end; if (c->is_live || v->cur_seq_no < v->last_seq_no) { if (!v->is_restart_needed) v->cur_seq_no++; v->is_restart_needed = 1; } end: return ret; } static int nested_io_open(AVFormatContext *s, AVIOContext **pb, const char *url, int flags, AVDictionary **opts) { av_log(s, AV_LOG_ERROR, "A DASH playlist item '%s' referred to an external file '%s'. " "Opening this file was forbidden for security reasons\n", s->url, url); return AVERROR(EPERM); } static void close_demux_for_component(struct representation *pls) { /* note: the internal buffer could have changed */ av_freep(&pls->pb.pub.buffer); memset(&pls->pb, 0x00, sizeof(pls->pb)); pls->ctx->pb = NULL; avformat_close_input(&pls->ctx); } static int reopen_demux_for_component(AVFormatContext *s, struct representation *pls) { DASHContext *c = s->priv_data; const AVInputFormat *in_fmt = NULL; AVDictionary *in_fmt_opts = NULL; uint8_t *avio_ctx_buffer = NULL; int ret = 0, i; if (pls->ctx) { close_demux_for_component(pls); } if (ff_check_interrupt(&s->interrupt_callback)) { ret = AVERROR_EXIT; goto fail; } if (!(pls->ctx = avformat_alloc_context())) { ret = AVERROR(ENOMEM); goto fail; } avio_ctx_buffer = av_malloc(INITIAL_BUFFER_SIZE); if (!avio_ctx_buffer ) { ret = AVERROR(ENOMEM); avformat_free_context(pls->ctx); pls->ctx = NULL; goto fail; } ffio_init_context(&pls->pb, avio_ctx_buffer, INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, c->is_live ? NULL : seek_data); pls->pb.pub.seekable = 0; if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0) goto fail; pls->ctx->flags = AVFMT_FLAG_CUSTOM_IO; pls->ctx->probesize = s->probesize > 0 ? s->probesize : 1024 * 4; pls->ctx->max_analyze_duration = s->max_analyze_duration > 0 ? s->max_analyze_duration : 4 * AV_TIME_BASE; pls->ctx->interrupt_callback = s->interrupt_callback; ret = av_probe_input_buffer(&pls->pb.pub, &in_fmt, "", NULL, 0, 0); if (ret < 0) { av_log(s, AV_LOG_ERROR, "Error when loading first fragment of playlist\n"); avformat_free_context(pls->ctx); pls->ctx = NULL; goto fail; } pls->ctx->pb = &pls->pb.pub; pls->ctx->io_open = nested_io_open; if (c->cenc_decryption_key) av_dict_set(&in_fmt_opts, "decryption_key", c->cenc_decryption_key, 0); // provide additional information from mpd if available ret = avformat_open_input(&pls->ctx, "", in_fmt, &in_fmt_opts); //pls->init_section->url av_dict_free(&in_fmt_opts); if (ret < 0) goto fail; if (pls->n_fragments) { #if FF_API_R_FRAME_RATE if (pls->framerate.den) { for (i = 0; i < pls->ctx->nb_streams; i++) pls->ctx->streams[i]->r_frame_rate = pls->framerate; } #endif ret = avformat_find_stream_info(pls->ctx, NULL); if (ret < 0) goto fail; } fail: return ret; } static int open_demux_for_component(AVFormatContext *s, struct representation *pls) { int ret = 0; int i; pls->parent = s; pls->cur_seq_no = calc_cur_seg_no(s, pls); if (!pls->last_seq_no) { pls->last_seq_no = calc_max_seg_no(pls, s->priv_data); } ret = reopen_demux_for_component(s, pls); if (ret < 0) { goto fail; } for (i = 0; i < pls->ctx->nb_streams; i++) { AVStream *st = avformat_new_stream(s, NULL); AVStream *ist = pls->ctx->streams[i]; if (!st) { ret = AVERROR(ENOMEM); goto fail; } st->id = i; avcodec_parameters_copy(st->codecpar, ist->codecpar); avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den); // copy disposition st->disposition = ist->disposition; } return 0; fail: return ret; } static int is_common_init_section_exist(struct representation **pls, int n_pls) { struct fragment *first_init_section = pls[0]->init_section; char *url =NULL; int64_t url_offset = -1; int64_t size = -1; int i = 0; if (first_init_section == NULL || n_pls == 0) return 0; url = first_init_section->url; url_offset = first_init_section->url_offset; size = pls[0]->init_section->size; for (i=0;iinit_section) continue; if (av_strcasecmp(pls[i]->init_section->url, url) || pls[i]->init_section->url_offset != url_offset || pls[i]->init_section->size != size) { return 0; } } return 1; } static int copy_init_section(struct representation *rep_dest, struct representation *rep_src) { rep_dest->init_sec_buf = av_mallocz(rep_src->init_sec_buf_size); if (!rep_dest->init_sec_buf) { av_log(rep_dest->ctx, AV_LOG_WARNING, "Cannot alloc memory for init_sec_buf\n"); return AVERROR(ENOMEM); } memcpy(rep_dest->init_sec_buf, rep_src->init_sec_buf, rep_src->init_sec_data_len); rep_dest->init_sec_buf_size = rep_src->init_sec_buf_size; rep_dest->init_sec_data_len = rep_src->init_sec_data_len; rep_dest->cur_timestamp = rep_src->cur_timestamp; return 0; } static void move_metadata(AVStream *st, const char *key, char **value) { if (*value) { av_dict_set(&st->metadata, key, *value, AV_DICT_DONT_STRDUP_VAL); *value = NULL; } } static int dash_read_header(AVFormatContext *s) { DASHContext *c = s->priv_data; struct representation *rep; AVProgram *program; int ret = 0; int stream_index = 0; int i; c->interrupt_callback = &s->interrupt_callback; if ((ret = ffio_copy_url_options(s->pb, &c->avio_opts)) < 0) return ret; if ((ret = parse_manifest(s, s->url, s->pb)) < 0) return ret; /* If this isn't a live stream, fill the total duration of the * stream. */ if (!c->is_live) { s->duration = (int64_t) c->media_presentation_duration * AV_TIME_BASE; } else { av_dict_set(&c->avio_opts, "seekable", "0", 0); } if(c->n_videos) c->is_init_section_common_video = is_common_init_section_exist(c->videos, c->n_videos); /* Open the demuxer for video and audio components if available */ for (i = 0; i < c->n_videos; i++) { rep = c->videos[i]; if (i > 0 && c->is_init_section_common_video) { ret = copy_init_section(rep, c->videos[0]); if (ret < 0) return ret; } ret = open_demux_for_component(s, rep); if (ret) return ret; rep->stream_index = stream_index; ++stream_index; } if(c->n_audios) c->is_init_section_common_audio = is_common_init_section_exist(c->audios, c->n_audios); for (i = 0; i < c->n_audios; i++) { rep = c->audios[i]; if (i > 0 && c->is_init_section_common_audio) { ret = copy_init_section(rep, c->audios[0]); if (ret < 0) return ret; } ret = open_demux_for_component(s, rep); if (ret) return ret; rep->stream_index = stream_index; ++stream_index; } if (c->n_subtitles) c->is_init_section_common_subtitle = is_common_init_section_exist(c->subtitles, c->n_subtitles); for (i = 0; i < c->n_subtitles; i++) { rep = c->subtitles[i]; if (i > 0 && c->is_init_section_common_subtitle) { ret = copy_init_section(rep, c->subtitles[0]); if (ret < 0) return ret; } ret = open_demux_for_component(s, rep); if (ret) return ret; rep->stream_index = stream_index; ++stream_index; } if (!stream_index) return AVERROR_INVALIDDATA; /* Create a program */ program = av_new_program(s, 0); if (!program) return AVERROR(ENOMEM); for (i = 0; i < c->n_videos; i++) { rep = c->videos[i]; av_program_add_stream_index(s, 0, rep->stream_index); rep->assoc_stream = s->streams[rep->stream_index]; if (rep->bandwidth > 0) av_dict_set_int(&rep->assoc_stream->metadata, "variant_bitrate", rep->bandwidth, 0); move_metadata(rep->assoc_stream, "id", &rep->id); } for (i = 0; i < c->n_audios; i++) { rep = c->audios[i]; av_program_add_stream_index(s, 0, rep->stream_index); rep->assoc_stream = s->streams[rep->stream_index]; if (rep->bandwidth > 0) av_dict_set_int(&rep->assoc_stream->metadata, "variant_bitrate", rep->bandwidth, 0); move_metadata(rep->assoc_stream, "id", &rep->id); move_metadata(rep->assoc_stream, "language", &rep->lang); } for (i = 0; i < c->n_subtitles; i++) { rep = c->subtitles[i]; av_program_add_stream_index(s, 0, rep->stream_index); rep->assoc_stream = s->streams[rep->stream_index]; move_metadata(rep->assoc_stream, "id", &rep->id); move_metadata(rep->assoc_stream, "language", &rep->lang); } return 0; } static void recheck_discard_flags(AVFormatContext *s, struct representation **p, int n) { int i, j; for (i = 0; i < n; i++) { struct representation *pls = p[i]; int needed = !pls->assoc_stream || pls->assoc_stream->discard < AVDISCARD_ALL; if (needed && !pls->ctx) { pls->cur_seg_offset = 0; pls->init_sec_buf_read_offset = 0; /* Catch up */ for (j = 0; j < n; j++) { pls->cur_seq_no = FFMAX(pls->cur_seq_no, p[j]->cur_seq_no); } reopen_demux_for_component(s, pls); av_log(s, AV_LOG_INFO, "Now receiving stream_index %d\n", pls->stream_index); } else if (!needed && pls->ctx) { close_demux_for_component(pls); ff_format_io_close(pls->parent, &pls->input); av_log(s, AV_LOG_INFO, "No longer receiving stream_index %d\n", pls->stream_index); } } } static int dash_read_packet(AVFormatContext *s, AVPacket *pkt) { DASHContext *c = s->priv_data; int ret = 0, i; int64_t mints = 0; struct representation *cur = NULL; struct representation *rep = NULL; recheck_discard_flags(s, c->videos, c->n_videos); recheck_discard_flags(s, c->audios, c->n_audios); recheck_discard_flags(s, c->subtitles, c->n_subtitles); for (i = 0; i < c->n_videos; i++) { rep = c->videos[i]; if (!rep->ctx) continue; if (!cur || rep->cur_timestamp < mints) { cur = rep; mints = rep->cur_timestamp; } } for (i = 0; i < c->n_audios; i++) { rep = c->audios[i]; if (!rep->ctx) continue; if (!cur || rep->cur_timestamp < mints) { cur = rep; mints = rep->cur_timestamp; } } for (i = 0; i < c->n_subtitles; i++) { rep = c->subtitles[i]; if (!rep->ctx) continue; if (!cur || rep->cur_timestamp < mints) { cur = rep; mints = rep->cur_timestamp; } } if (!cur) { return AVERROR_INVALIDDATA; } while (!ff_check_interrupt(c->interrupt_callback) && !ret) { ret = av_read_frame(cur->ctx, pkt); if (ret >= 0) { /* If we got a packet, return it */ cur->cur_timestamp = av_rescale(pkt->pts, (int64_t)cur->ctx->streams[0]->time_base.num * 90000, cur->ctx->streams[0]->time_base.den); pkt->stream_index = cur->stream_index; return 0; } if (cur->is_restart_needed) { cur->cur_seg_offset = 0; cur->init_sec_buf_read_offset = 0; ff_format_io_close(cur->parent, &cur->input); ret = reopen_demux_for_component(s, cur); cur->is_restart_needed = 0; } } return AVERROR_EOF; } static int dash_close(AVFormatContext *s) { DASHContext *c = s->priv_data; free_audio_list(c); free_video_list(c); free_subtitle_list(c); av_dict_free(&c->avio_opts); av_freep(&c->base_url); return 0; } static int dash_seek(AVFormatContext *s, struct representation *pls, int64_t seek_pos_msec, int flags, int dry_run) { int ret = 0; int i = 0; int j = 0; int64_t duration = 0; av_log(pls->parent, AV_LOG_VERBOSE, "DASH seek pos[%"PRId64"ms] %s\n", seek_pos_msec, dry_run ? " (dry)" : ""); // single fragment mode if (pls->n_fragments == 1) { pls->cur_timestamp = 0; pls->cur_seg_offset = 0; if (dry_run) return 0; ff_read_frame_flush(pls->ctx); return av_seek_frame(pls->ctx, -1, seek_pos_msec * 1000, flags); } ff_format_io_close(pls->parent, &pls->input); // find the nearest fragment if (pls->n_timelines > 0 && pls->fragment_timescale > 0) { int64_t num = pls->first_seq_no; av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline start n_timelines[%d] " "last_seq_no[%"PRId64"].\n", (int)pls->n_timelines, (int64_t)pls->last_seq_no); for (i = 0; i < pls->n_timelines; i++) { if (pls->timelines[i]->starttime > 0) { duration = pls->timelines[i]->starttime; } duration += pls->timelines[i]->duration; if (seek_pos_msec < ((duration * 1000) / pls->fragment_timescale)) { goto set_seq_num; } for (j = 0; j < pls->timelines[i]->repeat; j++) { duration += pls->timelines[i]->duration; num++; if (seek_pos_msec < ((duration * 1000) / pls->fragment_timescale)) { goto set_seq_num; } } num++; } set_seq_num: pls->cur_seq_no = num > pls->last_seq_no ? pls->last_seq_no : num; av_log(pls->parent, AV_LOG_VERBOSE, "dash_seek with SegmentTimeline end cur_seq_no[%"PRId64"].\n", (int64_t)pls->cur_seq_no); } else if (pls->fragment_duration > 0) { pls->cur_seq_no = pls->first_seq_no + ((seek_pos_msec * pls->fragment_timescale) / pls->fragment_duration) / 1000; } else { av_log(pls->parent, AV_LOG_ERROR, "dash_seek missing timeline or fragment_duration\n"); pls->cur_seq_no = pls->first_seq_no; } pls->cur_timestamp = 0; pls->cur_seg_offset = 0; pls->init_sec_buf_read_offset = 0; ret = dry_run ? 0 : reopen_demux_for_component(s, pls); return ret; } static int dash_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) { int ret = 0, i; DASHContext *c = s->priv_data; int64_t seek_pos_msec = av_rescale_rnd(timestamp, 1000, s->streams[stream_index]->time_base.den, flags & AVSEEK_FLAG_BACKWARD ? AV_ROUND_DOWN : AV_ROUND_UP); if ((flags & AVSEEK_FLAG_BYTE) || c->is_live) return AVERROR(ENOSYS); /* Seek in discarded streams with dry_run=1 to avoid reopening them */ for (i = 0; i < c->n_videos; i++) { if (!ret) ret = dash_seek(s, c->videos[i], seek_pos_msec, flags, !c->videos[i]->ctx); } for (i = 0; i < c->n_audios; i++) { if (!ret) ret = dash_seek(s, c->audios[i], seek_pos_msec, flags, !c->audios[i]->ctx); } for (i = 0; i < c->n_subtitles; i++) { if (!ret) ret = dash_seek(s, c->subtitles[i], seek_pos_msec, flags, !c->subtitles[i]->ctx); } return ret; } static int dash_probe(const AVProbeData *p) { if (!av_stristr(p->buf, "buf, "dash:profile:isoff-on-demand:2011") || av_stristr(p->buf, "dash:profile:isoff-live:2011") || av_stristr(p->buf, "dash:profile:isoff-live:2012") || av_stristr(p->buf, "dash:profile:isoff-main:2011") || av_stristr(p->buf, "3GPP:PSS:profile:DASH1")) { return AVPROBE_SCORE_MAX; } if (av_stristr(p->buf, "dash:profile")) { return AVPROBE_SCORE_MAX; } return 0; } #define OFFSET(x) offsetof(DASHContext, x) #define FLAGS AV_OPT_FLAG_DECODING_PARAM static const AVOption dash_options[] = { {"allowed_extensions", "List of file extensions that dash is allowed to access", OFFSET(allowed_extensions), AV_OPT_TYPE_STRING, {.str = "aac,m4a,m4s,m4v,mov,mp4,webm,ts"}, INT_MIN, INT_MAX, FLAGS}, { "cenc_decryption_key", "Media decryption key (hex)", OFFSET(cenc_decryption_key), AV_OPT_TYPE_STRING, {.str = NULL}, INT_MIN, INT_MAX, .flags = FLAGS }, {NULL} }; static const AVClass dash_class = { .class_name = "dash", .item_name = av_default_item_name, .option = dash_options, .version = LIBAVUTIL_VERSION_INT, }; const FFInputFormat ff_dash_demuxer = { .p.name = "dash", .p.long_name = NULL_IF_CONFIG_SMALL("Dynamic Adaptive Streaming over HTTP"), .p.priv_class = &dash_class, .p.flags = AVFMT_NO_BYTE_SEEK, .priv_data_size = sizeof(DASHContext), .flags_internal = FF_FMT_INIT_CLEANUP, .read_probe = dash_probe, .read_header = dash_read_header, .read_packet = dash_read_packet, .read_close = dash_close, .read_seek = dash_read_seek, };