diff options
Diffstat (limited to 'libavformat/dashdec.c')
| -rw-r--r-- | libavformat/dashdec.c | 1848 |
1 files changed, 1848 insertions, 0 deletions
diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c new file mode 100644 index 0000000000..9a3a199d4e --- /dev/null +++ b/libavformat/dashdec.c @@ -0,0 +1,1848 @@ +/* + * 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 <libxml/parser.h> +#include "libavutil/intreadwrite.h" +#include "libavutil/opt.h" +#include "libavutil/time.h" +#include "libavutil/parseutils.h" +#include "internal.h" +#include "avio_internal.h" +#include "dash.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; + AVIOContext pb; + AVIOContext *input; + AVFormatContext *parent; + AVFormatContext *ctx; + AVPacket pkt; + int rep_idx; + int rep_count; + int stream_index; + + enum AVMediaType type; + + 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; + struct representation *cur_video; + struct representation *cur_audio; + + /* MediaPresentationDescription Attribute */ + uint64_t media_presentation_duration; + uint64_t suggested_presentation_delay; + uint64_t availability_start_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; + + int is_live; + AVIOInterruptCB *interrupt_callback; + char *user_agent; ///< holds HTTP user agent set as an AVOption to the HTTP protocol context + char *cookies; ///< holds HTTP cookie values set in either the initial response or as an AVOption to the HTTP protocol context + char *headers; ///< holds HTTP headers set as an AVOption to the HTTP protocol context + char *allowed_extensions; + AVDictionary *avio_opts; +} DASHContext; + +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; + 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.buffer); + if (pls->input) + 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); +} + +static void set_httpheader_options(DASHContext *c, AVDictionary *opts) +{ + // broker prior HTTP options that should be consistent across requests + av_dict_set(&opts, "user-agent", c->user_agent, 0); + av_dict_set(&opts, "cookies", c->cookies, 0); + av_dict_set(&opts, "headers", c->headers, 0); + if (c->is_live) { + av_dict_set(&opts, "seekable", "0", 0); + } +} +static void update_options(char **dest, const char *name, void *src) +{ + av_freep(dest); + av_opt_get(src, name, AV_OPT_SEARCH_CHILDREN, (uint8_t**)dest); + if (*dest) + av_freep(dest); +} + +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 ret; + + av_dict_copy(&tmp, opts, 0); + av_dict_copy(&tmp, opts2, 0); + + 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; + + // 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, strlen(proto_name)) && url[strlen(proto_name)] == ':') + ; + else if (av_strstart(url, "crypto", NULL) && !strncmp(proto_name, url + 7, strlen(proto_name)) && url[7 + strlen(proto_name)] == ':') + ; + else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5)) + return AVERROR_INVALIDDATA; + + ret = s->io_open(s, pb, url, AVIO_FLAG_READ, &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_free(c->cookies); + c->cookies = new_cookies; + } + + av_dict_set(&opts, "cookies", c->cookies, 0); + } + + 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, + char *rep_id_val, + char *rep_bandwidth_val, + char *val) +{ + int i; + char *text; + char *url = NULL; + char tmp_str[MAX_URL_SIZE]; + char tmp_str_2[MAX_URL_SIZE]; + + memset(tmp_str, 0, sizeof(tmp_str)); + + 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, sizeof(tmp_str)); + memset(tmp_str_2, 0, sizeof(tmp_str_2)); + ff_make_absolute_url(tmp_str_2, MAX_URL_SIZE, tmp_str, text); + av_strlcpy(tmp_str, tmp_str_2, sizeof(tmp_str)); + av_free(text); + } + } + } + + if (val) + av_strlcat(tmp_str, (const char*)val, sizeof(tmp_str)); + + if (rep_id_val) { + url = av_strireplace(tmp_str, "$RepresentationID$", (const char*)rep_id_val); + if (!url) { + return NULL; + } + av_strlcpy(tmp_str, url, sizeof(tmp_str)); + av_free(url); + } + if (rep_bandwidth_val && tmp_str[0] != '\0') { + url = av_strireplace(tmp_str, "$Bandwidth$", (const char*)rep_bandwidth_val); + if (!url) { + return NULL; + } + } + 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((const char *)val, "video")) { + type = AVMEDIA_TYPE_VIDEO; + } else if (av_stristr((const char *)val, "audio")) { + type = AVMEDIA_TYPE_AUDIO; + } + av_free(val); + } + } + } + return type; +} + +static int parse_manifest_segmenturlnode(AVFormatContext *s, struct representation *rep, + xmlNodePtr fragmenturl_node, + xmlNodePtr *baseurl_nodes, + char *rep_id_val, + char *rep_bandwidth_val) +{ + char *initialization_val = NULL; + char *media_val = NULL; + + if (!av_strcasecmp(fragmenturl_node->name, (const char *)"Initialization")) { + initialization_val = xmlGetProp(fragmenturl_node, "sourceURL"); + if (initialization_val) { + rep->init_section = av_mallocz(sizeof(struct fragment)); + if (!rep->init_section) { + av_free(initialization_val); + return AVERROR(ENOMEM); + } + rep->init_section->url = get_content_url(baseurl_nodes, 4, + rep_id_val, + rep_bandwidth_val, + initialization_val); + if (!rep->init_section->url) { + av_free(rep->init_section); + av_free(initialization_val); + return AVERROR(ENOMEM); + } + rep->init_section->size = -1; + av_free(initialization_val); + } + } else if (!av_strcasecmp(fragmenturl_node->name, (const char *)"SegmentURL")) { + media_val = xmlGetProp(fragmenturl_node, "media"); + if (media_val) { + struct fragment *seg = av_mallocz(sizeof(struct fragment)); + if (!seg) { + av_free(media_val); + return AVERROR(ENOMEM); + } + seg->url = get_content_url(baseurl_nodes, 4, + rep_id_val, + rep_bandwidth_val, + media_val); + if (!seg->url) { + av_free(seg); + av_free(media_val); + return AVERROR(ENOMEM); + } + seg->size = -1; + dynarray_add(&rep->fragments, &rep->n_fragments, seg); + av_free(media_val); + } + } + + return 0; +} + +static int parse_manifest_segmenttimeline(AVFormatContext *s, struct representation *rep, + xmlNodePtr fragment_timeline_node) +{ + xmlAttrPtr attr = NULL; + char *val = NULL; + + if (!av_strcasecmp(fragment_timeline_node->name, (const char *)"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, (const char *)"t")) { + tml->starttime = (int64_t)strtoll(val, NULL, 10); + } else if (!av_strcasecmp(attr->name, (const char *)"r")) { + tml->repeat =(int64_t) strtoll(val, NULL, 10); + } else if (!av_strcasecmp(attr->name, (const char *)"d")) { + tml->duration = (int64_t)strtoll(val, NULL, 10); + } + attr = attr->next; + av_free(val); + } + dynarray_add(&rep->timelines, &rep->n_timelines, tml); + } + + return 0; +} + +static int parse_manifest_representation(AVFormatContext *s, const char *url, + xmlNodePtr node, + xmlNodePtr adaptionset_node, + xmlNodePtr mpd_baseurl_node, + xmlNodePtr period_baseurl_node, + xmlNodePtr fragment_template_node, + xmlNodePtr content_component_node, + xmlNodePtr adaptionset_baseurl_node) +{ + int32_t ret = 0; + int32_t audio_rep_idx = 0; + int32_t video_rep_idx = 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 fragment_timeline_node = NULL; + xmlNodePtr fragment_templates_tab[2]; + char *duration_val = NULL; + char *presentation_timeoffset_val = NULL; + char *startnumber_val = NULL; + char *timescale_val = NULL; + char *initialization_val = NULL; + char *media_val = NULL; + xmlNodePtr baseurl_nodes[4]; + xmlNodePtr representation_node = node; + char *rep_id_val = xmlGetProp(representation_node, "id"); + char *rep_bandwidth_val = xmlGetProp(representation_node, "bandwidth"); + 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_UNKNOWN) { + av_log(s, AV_LOG_VERBOSE, "Parsing '%s' - skipp not supported representation type\n", url); + } else if ((type == AVMEDIA_TYPE_VIDEO && !c->cur_video) || (type == AVMEDIA_TYPE_AUDIO && !c->cur_audio)) { + // convert selected representation to our internal struct + rep = av_mallocz(sizeof(struct representation)); + if (!rep) { + ret = AVERROR(ENOMEM); + goto end; + } + 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"); + + baseurl_nodes[0] = mpd_baseurl_node; + baseurl_nodes[1] = period_baseurl_node; + baseurl_nodes[2] = adaptionset_baseurl_node; + baseurl_nodes[3] = representation_baseurl_node; + + if (representation_segmenttemplate_node || fragment_template_node) { + fragment_timeline_node = NULL; + fragment_templates_tab[0] = representation_segmenttemplate_node; + fragment_templates_tab[1] = fragment_template_node; + + presentation_timeoffset_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "presentationTimeOffset"); + duration_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "duration"); + startnumber_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "startNumber"); + timescale_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "timescale"); + initialization_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "initialization"); + media_val = get_val_from_nodes_tab(fragment_templates_tab, 2, "media"); + + if (initialization_val) { + rep->init_section = av_mallocz(sizeof(struct fragment)); + if (!rep->init_section) { + av_free(rep); + ret = AVERROR(ENOMEM); + goto end; + } + rep->init_section->url = get_content_url(baseurl_nodes, 4, rep_id_val, rep_bandwidth_val, initialization_val); + if (!rep->init_section->url) { + av_free(rep->init_section); + av_free(rep); + ret = AVERROR(ENOMEM); + goto end; + } + rep->init_section->size = -1; + av_free(initialization_val); + } + + if (media_val) { + rep->url_template = get_content_url(baseurl_nodes, 4, rep_id_val, rep_bandwidth_val, media_val); + av_free(media_val); + } + + if (presentation_timeoffset_val) { + rep->presentation_timeoffset = (int64_t) strtoll(presentation_timeoffset_val, NULL, 10); + av_free(presentation_timeoffset_val); + } + if (duration_val) { + rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10); + av_free(duration_val); + } + if (timescale_val) { + rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10); + av_free(timescale_val); + } + if (startnumber_val) { + rep->first_seq_no = (int64_t) strtoll(startnumber_val, NULL, 10); + av_free(startnumber_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 = xmlFirstElementChild(fragment_timeline_node); + while (fragment_timeline_node) { + ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node); + if (ret < 0) { + return ret; + } + fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node); + } + } + } else if (representation_baseurl_node && !representation_segmentlist_node) { + seg = av_mallocz(sizeof(struct fragment)); + if (!seg) { + ret = AVERROR(ENOMEM); + goto end; + } + seg->url = get_content_url(baseurl_nodes, 4, rep_id_val, rep_bandwidth_val, NULL); + if (!seg->url) { + av_free(seg); + ret = AVERROR(ENOMEM); + goto end; + } + seg->size = -1; + dynarray_add(&rep->fragments, &rep->n_fragments, seg); + } 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; + duration_val = xmlGetProp(representation_segmentlist_node, "duration"); + timescale_val = xmlGetProp(representation_segmentlist_node, "timescale"); + if (duration_val) { + rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10); + av_free(duration_val); + } + if (timescale_val) { + rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10); + av_free(timescale_val); + } + fragmenturl_node = xmlFirstElementChild(representation_segmentlist_node); + while (fragmenturl_node) { + ret = parse_manifest_segmenturlnode(s, rep, fragmenturl_node, + baseurl_nodes, + rep_id_val, + rep_bandwidth_val); + if (ret < 0) { + return ret; + } + fragmenturl_node = xmlNextElementSibling(fragmenturl_node); + } + + 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 = xmlFirstElementChild(fragment_timeline_node); + while (fragment_timeline_node) { + ret = parse_manifest_segmenttimeline(s, rep, fragment_timeline_node); + if (ret < 0) { + return ret; + } + fragment_timeline_node = xmlNextElementSibling(fragment_timeline_node); + } + } + } else { + free_representation(rep); + rep = NULL; + av_log(s, AV_LOG_ERROR, "Unknown format of Representation node id[%s] \n", (const char *)rep_id_val); + } + + if (rep) { + if (rep->fragment_duration > 0 && !rep->fragment_timescale) + rep->fragment_timescale = 1; + if (type == AVMEDIA_TYPE_VIDEO) { + rep->rep_idx = video_rep_idx; + c->cur_video = rep; + } else { + rep->rep_idx = audio_rep_idx; + c->cur_audio = rep; + } + } + } + + video_rep_idx += type == AVMEDIA_TYPE_VIDEO; + audio_rep_idx += type == AVMEDIA_TYPE_AUDIO; + +end: + if (rep_id_val) + av_free(rep_id_val); + if (rep_bandwidth_val) + av_free(rep_bandwidth_val); + + return ret; +} + +static int parse_manifest_adaptationset(AVFormatContext *s, const char *url, + xmlNodePtr adaptionset_node, + xmlNodePtr mpd_baseurl_node, + xmlNodePtr period_baseurl_node) +{ + int ret = 0; + xmlNodePtr fragment_template_node = NULL; + xmlNodePtr content_component_node = NULL; + xmlNodePtr adaptionset_baseurl_node = NULL; + xmlNodePtr node = NULL; + + node = xmlFirstElementChild(adaptionset_node); + while (node) { + if (!av_strcasecmp(node->name, (const char *)"SegmentTemplate")) { + fragment_template_node = node; + } else if (!av_strcasecmp(node->name, (const char *)"ContentComponent")) { + content_component_node = node; + } else if (!av_strcasecmp(node->name, (const char *)"BaseURL")) { + adaptionset_baseurl_node = node; + } else if (!av_strcasecmp(node->name, (const char *)"Representation")) { + ret = parse_manifest_representation(s, url, node, + adaptionset_node, + mpd_baseurl_node, + period_baseurl_node, + fragment_template_node, + content_component_node, + adaptionset_baseurl_node); + if (ret < 0) { + return ret; + } + } + node = xmlNextElementSibling(node); + } + 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; + uint8_t *new_url = NULL; + int64_t filesize = 0; + char *buffer = NULL; + AVDictionary *opts = NULL; + xmlDoc *doc = NULL; + xmlNodePtr root_element = NULL; + xmlNodePtr node = NULL; + xmlNodePtr period_node = NULL; + xmlNodePtr mpd_baseurl_node = NULL; + xmlNodePtr period_baseurl_node = NULL; + xmlNodePtr adaptionset_node = NULL; + xmlAttrPtr attr = NULL; + char *val = NULL; + uint32_t perdiod_duration_sec = 0; + uint32_t perdiod_start_sec = 0; + int32_t audio_rep_idx = 0; + int32_t video_rep_idx = 0; + + if (!in) { + close_in = 1; + + set_httpheader_options(c, opts); + 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, &new_url) >= 0) { + c->base_url = av_strdup(new_url); + } else { + c->base_url = av_strdup(url); + } + + filesize = avio_size(in); + if (filesize <= 0) { + filesize = 8 * 1024; + } + + buffer = av_mallocz(filesize); + if (!buffer) { + av_free(c->base_url); + return AVERROR(ENOMEM); + } + + filesize = avio_read(in, buffer, filesize); + if (filesize <= 0) { + av_log(s, AV_LOG_ERROR, "Unable to read to offset '%s'\n", url); + ret = AVERROR_INVALIDDATA; + } else { + LIBXML_TEST_VERSION + + doc = xmlReadMemory(buffer, filesize, 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, (const char *)"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, (const char *)"dynamic")) + c->is_live = 1; + av_free(val); + + attr = node->properties; + while (attr) { + val = xmlGetProp(node, attr->name); + + if (!av_strcasecmp(attr->name, (const char *)"availabilityStartTime")) { + c->availability_start_time = get_utc_date_time_insec(s, (const char *)val); + } else if (!av_strcasecmp(attr->name, (const char *)"publishTime")) { + c->publish_time = get_utc_date_time_insec(s, (const char *)val); + } else if (!av_strcasecmp(attr->name, (const char *)"minimumUpdatePeriod")) { + c->minimum_update_period = get_duration_insec(s, (const char *)val); + } else if (!av_strcasecmp(attr->name, (const char *)"timeShiftBufferDepth")) { + c->time_shift_buffer_depth = get_duration_insec(s, (const char *)val); + } else if (!av_strcasecmp(attr->name, (const char *)"minBufferTime")) { + c->min_buffer_time = get_duration_insec(s, (const char *)val); + } else if (!av_strcasecmp(attr->name, (const char *)"suggestedPresentationDelay")) { + c->suggested_presentation_delay = get_duration_insec(s, (const char *)val); + } else if (!av_strcasecmp(attr->name, (const char *)"mediaPresentationDuration")) { + c->media_presentation_duration = get_duration_insec(s, (const char *)val); + } + attr = attr->next; + av_free(val); + } + + mpd_baseurl_node = find_child_node_by_name(node, "BaseURL"); + + // at now we can handle only one period, with the longest duration + node = xmlFirstElementChild(node); + while (node) { + if (!av_strcasecmp(node->name, (const char *)"Period")) { + perdiod_duration_sec = 0; + perdiod_start_sec = 0; + attr = node->properties; + while (attr) { + val = xmlGetProp(node, attr->name); + if (!av_strcasecmp(attr->name, (const char *)"duration")) { + perdiod_duration_sec = get_duration_insec(s, (const char *)val); + } else if (!av_strcasecmp(attr->name, (const char *)"start")) { + perdiod_start_sec = get_duration_insec(s, (const char *)val); + } + attr = attr->next; + av_free(val); + } + if ((perdiod_duration_sec) >= (c->period_duration)) { + period_node = node; + c->period_duration = perdiod_duration_sec; + c->period_start = perdiod_start_sec; + if (c->period_start > 0) + c->media_presentation_duration = c->period_duration; + } + } + 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, (const char *)"BaseURL")) { + period_baseurl_node = adaptionset_node; + } else if (!av_strcasecmp(adaptionset_node->name, (const char *)"AdaptationSet")) { + parse_manifest_adaptationset(s, url, adaptionset_node, mpd_baseurl_node, period_baseurl_node); + } + adaptionset_node = xmlNextElementSibling(adaptionset_node); + } + if (c->cur_video) { + c->cur_video->rep_count = video_rep_idx; + av_log(s, AV_LOG_VERBOSE, "rep_idx[%d]\n", (int)c->cur_video->rep_idx); + av_log(s, AV_LOG_VERBOSE, "rep_count[%d]\n", (int)video_rep_idx); + } + if (c->cur_audio) { + c->cur_audio->rep_count = audio_rep_idx; + } +cleanup: + /*free the document */ + xmlFreeDoc(doc); + xmlCleanupParser(); + } + + av_free(new_url); + av_free(buffer); + 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) { + num = pls->first_seq_no; + } else if (pls->n_timelines) { + start_time_offset = get_segment_start_time_based_on_timeline(pls, 0xFFFFFFFF) - pls->timelines[pls->first_seq_no]->starttime; // total duration of playlist + if (start_time_offset < 60 * pls->fragment_timescale) + start_time_offset = 0; + else + start_time_offset = start_time_offset - 60 * pls->fragment_timescale; + + num = calc_next_seg_no_from_timelines(pls, pls->timelines[pls->first_seq_no]->starttime + start_time_offset); + if (num == -1) + num = pls->first_seq_no; + } else if (pls->fragment_duration){ + if (pls->presentation_timeoffset) { + num = pls->presentation_timeoffset * pls->fragment_timescale / pls->fragment_duration; + } else if (c->publish_time > 0 && !c->availability_start_time) { + num = pls->first_seq_no + (((c->publish_time - c->availability_start_time) - 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) { + 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 = pls->parent->priv_data; + 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++) { + 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 + (c->media_presentation_duration * pls->fragment_timescale) / pls->fragment_duration; + } + + return num; +} + +static void move_timelines(struct representation *rep_src, struct representation *rep_dest) +{ + 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); + 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) +{ + 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); + rep_src->fragments = NULL; + rep_src->n_fragments = 0; + } +} + + +static int refresh_manifest(AVFormatContext *s) +{ + + int ret = 0; + DASHContext *c = s->priv_data; + + // save current context + struct representation *cur_video = c->cur_video; + struct representation *cur_audio = c->cur_audio; + char *base_url = c->base_url; + + c->base_url = NULL; + c->cur_video = NULL; + c->cur_audio = NULL; + ret = parse_manifest(s, s->filename, NULL); + if (ret) + goto finish; + + if (cur_video && cur_video->timelines || cur_audio && cur_audio->timelines) { + // calc current time + int64_t currentVideoTime = 0; + int64_t currentAudioTime = 0; + if (cur_video && cur_video->timelines) + currentVideoTime = get_segment_start_time_based_on_timeline(cur_video, cur_video->cur_seq_no) / cur_video->fragment_timescale; + if (cur_audio && cur_audio->timelines) + currentAudioTime = get_segment_start_time_based_on_timeline(cur_audio, cur_audio->cur_seq_no) / cur_audio->fragment_timescale; + // update segments + if (cur_video && cur_video->timelines) { + c->cur_video->cur_seq_no = calc_next_seg_no_from_timelines(c->cur_video, currentVideoTime * cur_video->fragment_timescale - 1); + if (c->cur_video->cur_seq_no >= 0) { + move_timelines(c->cur_video, cur_video); + } + } + if (cur_audio && cur_audio->timelines) { + c->cur_audio->cur_seq_no = calc_next_seg_no_from_timelines(c->cur_audio, currentAudioTime * cur_audio->fragment_timescale - 1); + if (c->cur_audio->cur_seq_no >= 0) { + move_timelines(c->cur_audio, cur_audio); + } + } + } + if (cur_video && cur_video->fragments) { + move_segments(c->cur_video, cur_video); + } + if (cur_audio && cur_audio->fragments) { + move_segments(c->cur_audio, cur_audio); + } + +finish: + // restore context + if (c->base_url) + av_free(base_url); + else + c->base_url = base_url; + if (c->cur_audio) + free_representation(c->cur_audio); + if (c->cur_video) + free_representation(c->cur_video); + c->cur_audio = cur_audio; + c->cur_video = cur_video; + 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); + + 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"], playlist %d\n", (int64_t)pls->cur_seq_no, min_seq_no, max_seq_no, (int)pls->rep_idx); + 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"], playlist %d\n", min_seq_no, max_seq_no, (int)pls->rep_idx); + } + 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[MAX_URL_SIZE]; + + ff_dash_fill_tmpl_params(tmpfilename, sizeof(tmpfilename), 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); + return NULL; + } + } + + seg->size = -1; + } + + return seg; +} + +enum ReadFromURLMode { + READ_NORMAL, + READ_COMPLETE, +}; + +static int read_from_url(struct representation *pls, struct fragment *seg, + uint8_t *buf, int buf_size, + enum ReadFromURLMode mode) +{ + 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); + + if (mode == READ_COMPLETE) { + ret = avio_read(pls->input, buf, buf_size); + if (ret < buf_size) { + av_log(pls->parent, AV_LOG_WARNING, "Could not read complete fragment.\n"); + } + } else { + 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[MAX_URL_SIZE]; + int ret; + + set_httpheader_options(c, opts); + 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, MAX_URL_SIZE, c->base_url, seg->url); + av_log(pls->parent, AV_LOG_VERBOSE, "DASH request for url '%s', offset %"PRId64", playlist %d\n", + url, seg->url_offset, pls->rep_idx); + ret = open_url(pls->parent, &pls->input, url, c->avio_opts, opts, NULL); + if (ret < 0) { + goto cleanup; + } + + /* Seek to the requested position. If this was a HTTP request, the offset + * should already be where want it to, but this allows e.g. local testing + * without a HTTP server. */ + if (!ret && seg->url_offset) { + int64_t seekret = avio_seek(pls->input, seg->url_offset, SEEK_SET); + if (seekret < 0) { + av_log(pls->parent, AV_LOG_ERROR, "Unable to seek to offset %"PRId64" of DASH fragment '%s'\n", seg->url_offset, seg->url); + ret = (int) seekret; + ff_format_io_close(pls->parent, &pls->input); + } + } + +cleanup: + 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 in playlist %d\n", + pls->rep_idx); + 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, READ_COMPLETE); + 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)) { + goto end; + ret = AVERROR_EXIT; + } + av_log(v->parent, AV_LOG_WARNING, "Failed to open fragment of playlist %d\n", v->rep_idx); + 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, READ_NORMAL); + if (ret > 0) + goto end; + + if (!v->is_restart_needed) + v->cur_seq_no++; + v->is_restart_needed = 1; + +end: + return ret; +} + +static int save_avio_options(AVFormatContext *s) +{ + DASHContext *c = s->priv_data; + const char *opts[] = { "headers", "user_agent", "user-agent", "cookies", NULL }, **opt = opts; + uint8_t *buf = NULL; + int ret = 0; + + while (*opt) { + if (av_opt_get(s->pb, *opt, AV_OPT_SEARCH_CHILDREN, &buf) >= 0) { + if (buf[0] != '\0') { + ret = av_dict_set(&c->avio_opts, *opt, buf, AV_DICT_DONT_STRDUP_VAL); + if (ret < 0) + return ret; + } + } + opt++; + } + + 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->filename, url); + return AVERROR(EPERM); +} + +static int reopen_demux_for_component(AVFormatContext *s, struct representation *pls) +{ + DASHContext *c = s->priv_data; + AVInputFormat *in_fmt = NULL; + AVDictionary *in_fmt_opts = NULL; + uint8_t *avio_ctx_buffer = NULL; + int ret = 0; + + if (pls->ctx) { + /* note: the internal buffer could have changed, and be != avio_ctx_buffer */ + av_freep(&pls->pb.buffer); + memset(&pls->pb, 0x00, sizeof(AVIOContext)); + pls->ctx->pb = NULL; + avformat_close_input(&pls->ctx); + pls->ctx = NULL; + } + 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; + } + if (c->is_live) { + ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, NULL); + } else { + ffio_init_context(&pls->pb, avio_ctx_buffer , INITIAL_BUFFER_SIZE, 0, pls, read_data, NULL, seek_data); + } + pls->pb.seekable = 0; + + if ((ret = ff_copy_whiteblacklists(pls->ctx, s)) < 0) + goto fail; + + pls->ctx->flags = AVFMT_FLAG_CUSTOM_IO; + pls->ctx->probesize = 1024 * 4; + pls->ctx->max_analyze_duration = 4 * AV_TIME_BASE; + ret = av_probe_input_buffer(&pls->pb, &in_fmt, "", NULL, 0, 0); + if (ret < 0) { + av_log(s, AV_LOG_ERROR, "Error when loading first fragment, playlist %d\n", (int)pls->rep_idx); + avformat_free_context(pls->ctx); + pls->ctx = NULL; + goto fail; + } + + pls->ctx->pb = &pls->pb; + pls->ctx->io_open = nested_io_open; + + // 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) { + 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); + pls->last_seq_no = calc_max_seg_no(pls); + + 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, pls->ctx->streams[i]->codecpar); + avpriv_set_pts_info(st, ist->pts_wrap_bits, ist->time_base.num, ist->time_base.den); + } + + return 0; +fail: + return ret; +} + +static int dash_read_header(AVFormatContext *s) +{ + void *u = (s->flags & AVFMT_FLAG_CUSTOM_IO) ? NULL : s->pb; + DASHContext *c = s->priv_data; + int ret = 0; + int stream_index = 0; + + c->interrupt_callback = &s->interrupt_callback; + // if the URL context is good, read important options we must broker later + if (u) { + update_options(&c->user_agent, "user-agent", u); + update_options(&c->cookies, "cookies", u); + update_options(&c->headers, "headers", u); + } + + if ((ret = parse_manifest(s, s->filename, s->pb)) < 0) + goto fail; + + if ((ret = save_avio_options(s)) < 0) + goto fail; + + /* 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; + } + + /* Open the demuxer for curent video and current audio components if available */ + if (!ret && c->cur_video) { + ret = open_demux_for_component(s, c->cur_video); + if (!ret) { + c->cur_video->stream_index = stream_index; + ++stream_index; + } else { + free_representation(c->cur_video); + c->cur_video = NULL; + } + } + + if (!ret && c->cur_audio) { + ret = open_demux_for_component(s, c->cur_audio); + if (!ret) { + c->cur_audio->stream_index = stream_index; + ++stream_index; + } else { + free_representation(c->cur_audio); + c->cur_audio = NULL; + } + } + + if (!stream_index) { + ret = AVERROR_INVALIDDATA; + goto fail; + } + + /* Create a program */ + if (!ret) { + AVProgram *program; + program = av_new_program(s, 0); + if (!program) { + goto fail; + } + + if (c->cur_video) { + av_program_add_stream_index(s, 0, c->cur_video->stream_index); + } + if (c->cur_audio) { + av_program_add_stream_index(s, 0, c->cur_audio->stream_index); + } + } + + return 0; +fail: + return ret; +} + +static int dash_read_packet(AVFormatContext *s, AVPacket *pkt) +{ + DASHContext *c = s->priv_data; + int ret = 0; + struct representation *cur = NULL; + + if (!c->cur_audio && !c->cur_video ) { + return AVERROR_INVALIDDATA; + } + if (c->cur_audio && !c->cur_video) { + cur = c->cur_audio; + } else if (!c->cur_audio && c->cur_video) { + cur = c->cur_video; + } else if (c->cur_video->cur_timestamp < c->cur_audio->cur_timestamp) { + cur = c->cur_video; + } else { + cur = c->cur_audio; + } + + if (cur->ctx) { + 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; + if (cur->input) + 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; + if (c->cur_audio) { + free_representation(c->cur_audio); + } + if (c->cur_video) { + free_representation(c->cur_video); + } + + av_freep(&c->cookies); + av_freep(&c->user_agent); + 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 ret = 0; + int i = 0; + int j = 0; + int64_t duration = 0; + + av_log(pls->parent, AV_LOG_VERBOSE, "DASH seek pos[%"PRId64"ms], playlist %d\n", seek_pos_msec, pls->rep_idx); + + // single fragment mode + if (pls->n_fragments == 1) { + pls->cur_timestamp = 0; + pls->cur_seg_offset = 0; + ff_read_frame_flush(pls->ctx); + return av_seek_frame(pls->ctx, -1, seek_pos_msec * 1000, flags); + } + + if (pls->input) + 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"], playlist %d.\n", + (int)pls->n_timelines, (int64_t)pls->last_seq_no, (int)pls->rep_idx); + 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"], playlist %d.\n", + (int64_t)pls->cur_seq_no, (int)pls->rep_idx); + } 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 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 = 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; + 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); + if (c->cur_audio) { + ret = dash_seek(s, c->cur_audio, seek_pos_msec, flags); + } + if (!ret && c->cur_video) { + ret = dash_seek(s, c->cur_video, seek_pos_msec, flags); + } + return ret; +} + +static int dash_probe(AVProbeData *p) +{ + if (!av_stristr(p->buf, "<MPD")) + return 0; + + if (av_stristr(p->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")) { + 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"}, + INT_MIN, INT_MAX, FLAGS}, + {NULL} +}; + +static const AVClass dash_class = { + .class_name = "dash", + .item_name = av_default_item_name, + .option = dash_options, + .version = LIBAVUTIL_VERSION_INT, +}; + +AVInputFormat ff_dash_demuxer = { + .name = "dash", + .long_name = NULL_IF_CONFIG_SMALL("Dynamic Adaptive Streaming over HTTP"), + .priv_class = &dash_class, + .priv_data_size = sizeof(DASHContext), + .read_probe = dash_probe, + .read_header = dash_read_header, + .read_packet = dash_read_packet, + .read_close = dash_close, + .read_seek = dash_read_seek, + .flags = AVFMT_NO_BYTE_SEEK, +}; |