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FFmpeg/libavformat/dashdec.c

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/*
* 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
#define MAX_MANIFEST_SIZE 50 * 1024
#define DEFAULT_MANIFEST_SIZE 8 * 1024
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;
char id[20];
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;
/* Flags for init section*/
int is_init_section_common_video;
int is_init_section_common_audio;
} DASHContext;
static int ishttp(char *url)
{
const char *proto_name = avio_find_protocol_name(url);
return 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.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);
}
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 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;
av_freep(pb);
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);
char *tmp_str_2 = av_mallocz(max_url_size);
if (!tmp_str || !tmp_str_2) {
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);
memset(tmp_str_2, 0, max_url_size);
ff_make_absolute_url(tmp_str_2, max_url_size, tmp_str, text);
av_strlcpy(tmp_str, tmp_str_2, max_url_size);
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, "$RepresentationID$", (const char*)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, "$Bandwidth$", (const char*)rep_bandwidth_val);
if (!url) {
goto end;
}
}
end:
av_free(tmp_str);
av_free(tmp_str_2);
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;
} else if (av_stristr((const char *)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;
if (!av_strcasecmp(fragmenturl_node->name, (const char *)"Initialization")) {
initialization_val = xmlGetProp(fragmenturl_node, "sourceURL");
range_val = xmlGetProp(fragmenturl_node, "range");
if (initialization_val || range_val) {
rep->init_section = get_Fragment(range_val);
if (!rep->init_section) {
xmlFree(initialization_val);
xmlFree(range_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);
if (!rep->init_section->url) {
av_free(rep->init_section);
xmlFree(initialization_val);
xmlFree(range_val);
return AVERROR(ENOMEM);
}
xmlFree(initialization_val);
xmlFree(range_val);
}
} else if (!av_strcasecmp(fragmenturl_node->name, (const char *)"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);
if (!seg) {
xmlFree(media_val);
xmlFree(range_val);
return AVERROR(ENOMEM);
}
seg->url = get_content_url(baseurl_nodes, 4,
max_url_size,
rep_id_val,
rep_bandwidth_val,
media_val);
if (!seg->url) {
av_free(seg);
xmlFree(media_val);
xmlFree(range_val);
return AVERROR(ENOMEM);
}
dynarray_add(&rep->fragments, &rep->n_fragments, seg);
xmlFree(media_val);
xmlFree(range_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;
xmlFree(val);
}
dynarray_add(&rep->timelines, &rep->n_timelines, tml);
}
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 (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;
int32_t subtitle_rep_idx = 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 segmentlists_tab[3];
xmlNodePtr fragment_timeline_node = NULL;
xmlNodePtr fragment_templates_tab[5];
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;
char *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");
char *rep_framerate_val = xmlGetProp(representation_node, "frameRate");
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 || type == AVMEDIA_TYPE_AUDIO || type == AVMEDIA_TYPE_SUBTITLE) {
// convert selected representation to our internal struct
rep = av_mallocz(sizeof(struct representation));
if (!rep) {
ret = AVERROR(ENOMEM);
goto end;
}
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);
ret = AVERROR(ENOMEM);
goto end;
}
}
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");
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_val ? strlen(rep_id_val) : 0)
+ (rep_bandwidth_val ? strlen(rep_bandwidth_val) : 0));
if (ret == AVERROR(ENOMEM) || ret == 0) {
goto end;
}
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;
presentation_timeoffset_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "presentationTimeOffset");
duration_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "duration");
startnumber_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "startNumber");
timescale_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "timescale");
initialization_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "initialization");
media_val = get_val_from_nodes_tab(fragment_templates_tab, 4, "media");
if (initialization_val) {
rep->init_section = av_mallocz(sizeof(struct fragment));
if (!rep->init_section) {
av_free(rep);
ret = AVERROR(ENOMEM);
goto end;
}
c->max_url_size = aligned(c->max_url_size + strlen(initialization_val));
rep->init_section->url = get_content_url(baseurl_nodes, 4, c->max_url_size, 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;
xmlFree(initialization_val);
}
if (media_val) {
c->max_url_size = aligned(c->max_url_size + strlen(media_val));
rep->url_template = get_content_url(baseurl_nodes, 4, c->max_url_size, rep_id_val, rep_bandwidth_val, media_val);
xmlFree(media_val);
}
if (presentation_timeoffset_val) {
rep->presentation_timeoffset = (int64_t) strtoll(presentation_timeoffset_val, NULL, 10);
av_log(s, AV_LOG_TRACE, "rep->presentation_timeoffset = [%"PRId64"]\n", rep->presentation_timeoffset);
xmlFree(presentation_timeoffset_val);
}
if (duration_val) {
rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10);
av_log(s, AV_LOG_TRACE, "rep->fragment_duration = [%"PRId64"]\n", rep->fragment_duration);
xmlFree(duration_val);
}
if (timescale_val) {
rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10);
av_log(s, AV_LOG_TRACE, "rep->fragment_timescale = [%"PRId64"]\n", rep->fragment_timescale);
xmlFree(timescale_val);
}
if (startnumber_val) {
rep->start_number = rep->first_seq_no = (int64_t) strtoll(startnumber_val, NULL, 10);
av_log(s, AV_LOG_TRACE, "rep->first_seq_no = [%"PRId64"]\n", rep->first_seq_no);
xmlFree(startnumber_val);
}
if (adaptionset_supplementalproperty_node) {
if (!av_strcasecmp(xmlGetProp(adaptionset_supplementalproperty_node,"schemeIdUri"), "http://dashif.org/guidelines/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) {
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, c->max_url_size, 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;
segmentlists_tab[0] = representation_segmentlist_node;
segmentlists_tab[1] = adaptionset_segmentlist_node;
segmentlists_tab[2] = period_segmentlist_node;
duration_val = get_val_from_nodes_tab(segmentlists_tab, 3, "duration");
timescale_val = get_val_from_nodes_tab(segmentlists_tab, 3, "timescale");
startnumber_val = get_val_from_nodes_tab(segmentlists_tab, 3, "startNumber");
if (duration_val) {
rep->fragment_duration = (int64_t) strtoll(duration_val, NULL, 10);
av_log(s, AV_LOG_TRACE, "rep->fragment_duration = [%"PRId64"]\n", rep->fragment_duration);
xmlFree(duration_val);
}
if (timescale_val) {
rep->fragment_timescale = (int64_t) strtoll(timescale_val, NULL, 10);
av_log(s, AV_LOG_TRACE, "rep->fragment_timescale = [%"PRId64"]\n", rep->fragment_timescale);
xmlFree(timescale_val);
}
if (startnumber_val) {
rep->start_number = rep->first_seq_no = (int64_t) strtoll(startnumber_val, NULL, 10);
av_log(s, AV_LOG_TRACE, "rep->first_seq_no = [%"PRId64"]\n", rep->first_seq_no);
xmlFree(startnumber_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 = 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) {
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;
rep->bandwidth = rep_bandwidth_val ? atoi(rep_bandwidth_val) : 0;
strncpy(rep->id, rep_id_val ? rep_id_val : "", sizeof(rep->id));
rep->framerate = av_make_q(0, 0);
if (type == AVMEDIA_TYPE_VIDEO && 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);
}
switch (type) {
case AVMEDIA_TYPE_VIDEO:
rep->rep_idx = video_rep_idx;
dynarray_add(&c->videos, &c->n_videos, rep);
break;
case AVMEDIA_TYPE_AUDIO:
rep->rep_idx = audio_rep_idx;
dynarray_add(&c->audios, &c->n_audios, rep);
break;
case AVMEDIA_TYPE_SUBTITLE:
rep->rep_idx = subtitle_rep_idx;
dynarray_add(&c->subtitles, &c->n_subtitles, rep);
break;
default:
av_log(s, AV_LOG_WARNING, "Unsupported the stream type %d\n", type);
break;
}
}
}
video_rep_idx += type == AVMEDIA_TYPE_VIDEO;
audio_rep_idx += type == AVMEDIA_TYPE_AUDIO;
subtitle_rep_idx += type == AVMEDIA_TYPE_SUBTITLE;
end:
if (rep_id_val)
xmlFree(rep_id_val);
if (rep_bandwidth_val)
xmlFree(rep_bandwidth_val);
if (rep_framerate_val)
xmlFree(rep_framerate_val);
return ret;
}
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, (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 *)"SegmentList")) {
adaptionset_segmentlist_node = node;
} else if (!av_strcasecmp(node->name, (const char *)"SupplementalProperty")) {
adaptionset_supplementalproperty_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,
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:
av_freep(&c->adaptionset_lang);
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;
uint8_t *new_url = NULL;
int64_t filesize = 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, &new_url) >= 0) {
c->base_url = av_strdup(new_url);
} else {
c->base_url = av_strdup(url);
}
filesize = avio_size(in);
if (filesize > MAX_MANIFEST_SIZE) {
av_log(s, AV_LOG_ERROR, "Manifest too large: %"PRId64"\n", filesize);
return AVERROR_INVALIDDATA;
}
av_bprint_init(&buf, (filesize > 0) ? filesize + 1 : DEFAULT_MANIFEST_SIZE, AV_BPRINT_SIZE_UNLIMITED);
if ((ret = avio_read_to_bprint(in, &buf, MAX_MANIFEST_SIZE)) < 0 ||
!avio_feof(in) ||
(filesize = buf.len) == 0) {
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, 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;
xmlFree(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);
av_log(s, AV_LOG_TRACE, "c->availability_start_time = [%"PRId64"]\n", c->availability_start_time);
} else if (!av_strcasecmp(attr->name, (const char *)"availabilityEndTime")) {
c->availability_end_time = get_utc_date_time_insec(s, (const char *)val);
av_log(s, AV_LOG_TRACE, "c->availability_end_time = [%"PRId64"]\n", c->availability_end_time);
} else if (!av_strcasecmp(attr->name, (const char *)"publishTime")) {
c->publish_time = get_utc_date_time_insec(s, (const char *)val);
av_log(s, AV_LOG_TRACE, "c->publish_time = [%"PRId64"]\n", c->publish_time);
} else if (!av_strcasecmp(attr->name, (const char *)"minimumUpdatePeriod")) {
c->minimum_update_period = get_duration_insec(s, (const char *)val);
av_log(s, AV_LOG_TRACE, "c->minimum_update_period = [%"PRId64"]\n", c->minimum_update_period);
} else if (!av_strcasecmp(attr->name, (const char *)"timeShiftBufferDepth")) {
c->time_shift_buffer_depth = get_duration_insec(s, (const char *)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, (const char *)"minBufferTime")) {
c->min_buffer_time = get_duration_insec(s, (const char *)val);
av_log(s, AV_LOG_TRACE, "c->min_buffer_time = [%"PRId64"]\n", c->min_buffer_time);
} else if (!av_strcasecmp(attr->name, (const char *)"suggestedPresentationDelay")) {
c->suggested_presentation_delay = get_duration_insec(s, (const char *)val);
av_log(s, AV_LOG_TRACE, "c->suggested_presentation_delay = [%"PRId64"]\n", c->suggested_presentation_delay);
} else if (!av_strcasecmp(attr->name, (const char *)"mediaPresentationDuration")) {
c->media_presentation_duration = get_duration_insec(s, (const char *)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, (const char *)"Period")) {
period_duration_sec = 0;
period_start_sec = 0;
attr = node->properties;
while (attr) {
val = xmlGetProp(node, attr->name);
if (!av_strcasecmp(attr->name, (const char *)"duration")) {
period_duration_sec = get_duration_insec(s, (const char *)val);
} else if (!av_strcasecmp(attr->name, (const char *)"start")) {
period_start_sec = get_duration_insec(s, (const char *)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, (const char *)"BaseURL")) {
period_baseurl_node = adaptionset_node;
} else if (!av_strcasecmp(adaptionset_node->name, (const char *)"SegmentTemplate")) {
period_segmenttemplate_node = adaptionset_node;
} else if (!av_strcasecmp(adaptionset_node->name, (const char *)"SegmentList")) {
period_segmentlist_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, period_segmenttemplate_node, period_segmentlist_node);
}
adaptionset_node = xmlNextElementSibling(adaptionset_node);
}
cleanup:
/*free the document */
xmlFreeDoc(doc);
xmlCleanupParser();
xmlFreeNode(mpd_baseurl_node);
}
av_free(new_url);
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 + (c->media_presentation_duration * pls->fragment_timescale) / pls->fragment_duration;
}
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"], 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= av_mallocz(c->max_url_size);
if (!tmpfilename) {
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);
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", playlist %d\n",
url, seg->url_offset, pls->rep_idx);
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 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);
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 %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);
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 save_avio_options(AVFormatContext *s)
{
DASHContext *c = s->priv_data;
const char *opts[] = {
"headers", "user_agent", "cookies", "http_proxy", "referer", "rw_timeout", "icy", NULL };
const char **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) {
av_freep(&buf);
return ret;
}
} else {
av_freep(&buf);
}
}
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->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.buffer);
memset(&pls->pb, 0x00, sizeof(AVIOContext));
pls->ctx->pb = NULL;
avformat_close_input(&pls->ctx);
pls->ctx = NULL;
}
static int reopen_demux_for_component(AVFormatContext *s, struct representation *pls)
{
DASHContext *c = s->priv_data;
ff_const59 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;
}
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 = 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, &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) {
#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;
// copy side data
for (int i = 0; i < ist->nb_side_data; i++) {
const AVPacketSideData *sd_src = &ist->side_data[i];
uint8_t *dst_data;
dst_data = av_stream_new_side_data(st, sd_src->type, sd_src->size);
if (!dst_data)
return AVERROR(ENOMEM);
memcpy(dst_data, sd_src->data, sd_src->size);
}
}
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;i<n_pls;i++) {
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 int dash_read_header(AVFormatContext *s)
{
DASHContext *c = s->priv_data;
struct representation *rep;
int ret = 0;
int stream_index = 0;
int i;
c->interrupt_callback = &s->interrupt_callback;
if ((ret = save_avio_options(s)) < 0)
goto fail;
if ((ret = parse_manifest(s, s->url, s->pb)) < 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;
} 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)
goto fail;
}
ret = open_demux_for_component(s, rep);
if (ret)
goto fail;
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)
goto fail;
}
ret = open_demux_for_component(s, rep);
if (ret)
goto fail;
rep->stream_index = stream_index;
++stream_index;
}
if (c->n_subtitles)
c->is_init_section_common_audio = 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_audio) {
ret = copy_init_section(rep, c->subtitles[0]);
if (ret < 0)
goto fail;
}
ret = open_demux_for_component(s, rep);
if (ret)
goto fail;
rep->stream_index = stream_index;
++stream_index;
}
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;
}
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);
if (rep->id[0])
av_dict_set(&rep->assoc_stream->metadata, "id", rep->id, 0);
}
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);
if (rep->id[0])
av_dict_set(&rep->assoc_stream->metadata, "id", rep->id, 0);
if (rep->lang) {
av_dict_set(&rep->assoc_stream->metadata, "language", rep->lang, 0);
av_freep(&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];
if (rep->id[0])
av_dict_set(&rep->assoc_stream->metadata, "id", rep->id, 0);
if (rep->lang) {
av_dict_set(&rep->assoc_stream->metadata, "language", rep->lang, 0);
av_freep(&rep->lang);
}
}
}
return 0;
fail:
return ret;
}
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);
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], playlist %d%s\n",
seek_pos_msec, pls->rep_idx, 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"], 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 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, "<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") ||
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},
{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,
};