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FFmpeg/libavformat/dashdec.c
Andreas Rheinhardt 3c138e5ceb avformat/dashdec: Don't allocate and leak strings that are never used 
Since commit e134c203 strdups of several elements of a manifest are kept
in the DASHContext; but said commit completely forgot to free these
strings again (with xmlFree()). Given that these strings are never used
at all, this commit closes this leak by reverting said commit.

This reverts commit e134c20374.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-03-29 08:45:16 +08:00

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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
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];
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;
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;
}
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;
}
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(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;
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;
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) {
return ret;
}
}
node = xmlNextElementSibling(node);
}
return 0;
}
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;
char *buffer = NULL;
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 <= 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;
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_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) {
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;
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);
}
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);
}
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);
}
}
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,
};
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