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dashenc: add option to provide UTC timing source

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If set, adds a UTCTiming tag in the manifest.

This is part of the recommendations listed in the "Guidelines for
Implementations: DASH-IF Interoperability Points" [1][2]
Section 4.7 describes means for the Availability Time Synchronization.

A usable default is "https://time.akamai.com/?iso"

[1] http://dashif.org/guidelines/
[2] http://dashif.org/wp-content/uploads/2016/12/DASH-IF-IOP-v4.0-clean.pdf
    (current version as of writing)

Signed-off-by: Peter Große <pegro@friiks.de>
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Peter Große 2017-01-29 20:41:22 +01:00 committed by Martin Storsjö
parent ba6a49e60b
commit 1920382aa9
1 changed files with 5 additions and 0 deletions
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5
libavformat/dashenc.c
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@ -94,6 +94,7 @@ typedef struct DASHContext {
const char *single_file_name;
const char *init_seg_name;
const char *media_seg_name;
const char *utc_timing_url;
} DASHContext;
static int dash_write(void *opaque, uint8_t *buf, int buf_size)
@ -490,6 +491,9 @@ static int write_manifest(AVFormatContext *s, int final)
av_free(escaped);
}
avio_printf(out, "\t</ProgramInformation>\n");
if (c->utc_timing_url)
avio_printf(out, "\t<UTCTiming schemeIdUri=\"urn:mpeg:dash:utc:http-xsdate:2014\" value=\"%s\"/>\n", c->utc_timing_url);
if (c->window_size && s->nb_streams > 0 && c->streams[0].nb_segments > 0 && !c->use_template) {
OutputStream *os = &c->streams[0];
int start_index = FFMAX(os->nb_segments - c->window_size, 0);
@ -981,6 +985,7 @@ static const AVOption options[] = {
{ "single_file_name", "DASH-templated name to be used for baseURL. Implies storing all segments in one file, accessed using byte ranges", OFFSET(single_file_name), AV_OPT_TYPE_STRING, { .str = NULL }, 0, 0, E },
{ "init_seg_name", "DASH-templated name to used for the initialization segment", OFFSET(init_seg_name), AV_OPT_TYPE_STRING, {.str = "init-stream$RepresentationID$.m4s"}, 0, 0, E },
{ "media_seg_name", "DASH-templated name to used for the media segments", OFFSET(media_seg_name), AV_OPT_TYPE_STRING, {.str = "chunk-stream$RepresentationID$-$Number%05d$.m4s"}, 0, 0, E },
{ "utc_timing_url", "URL of the page that will return the UTC timestamp in ISO format", OFFSET(utc_timing_url), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
{ NULL },
};