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webmdashenc: Support for live stream manifests
This patch adds support for creating DASH manifests for WebM Live Streams. It also updates the documentation and adds a fate test to verify the behavior of the new muxer flag. Signed-off-by: Vignesh Venkatasubramanian <vigneshv@google.com> Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Vignesh Venkatasubramanian
Michael Niedermayer
parent
bc0e65e7d0
commit
26f2e2f3f7
@ -1210,7 +1210,17 @@ is the @option{global_header} flag.
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WebM DASH Manifest muxer.
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This muxer implements the WebM DASH Manifest specification to generate the DASH manifest XML.
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This muxer implements the WebM DASH Manifest specification to generate the DASH
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manifest XML. It also supports manifest generation for DASH live streams.
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For more information see:
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@itemize @bullet
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@item
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WebM DASH Specification: @url{https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification}
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@item
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ISO DASH Specification: @url{http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip}
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@end itemize
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@subsection Options
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@ -1221,6 +1231,28 @@ This muxer supports the following options:
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This option has the following syntax: "id=x,streams=a,b,c id=y,streams=d,e" where x and y are the
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unique identifiers of the adaptation sets and a,b,c,d and e are the indices of the corresponding
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audio and video streams. Any number of adaptation sets can be added using this option.
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@item live
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Set this to 1 to create a live stream DASH Manifest. Default: 0.
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@item chunk_start_index
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Start index of the first chunk. This will go in the @samp{startNumber} attribute
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of the @samp{SegmentTemplate} element in the manifest. Default: 0.
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@item chunk_duration_ms
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Duration of each chunk in milliseconds. This will go in the @samp{duration}
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attribute of the @samp{SegmentTemplate} element in the manifest. Default: 1000.
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@item utc_timing_url
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URL of the page that will return the UTC timestamp in ISO format. This will go
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in the @samp{value} attribute of the @samp{UTCTiming} element in the manifest.
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Default: None.
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@item time_shift_buffer_depth
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Smallest time (in seconds) shifting buffer for which any Representation is
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guaranteed to be available. This will go in the @samp{timeShiftBufferDepth}
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attribute of the @samp{MPD} element. Default: 60.
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@end table
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@subsection Example
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@ -22,8 +22,11 @@
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/*
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* WebM DASH Specification:
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* https://sites.google.com/a/webmproject.org/wiki/adaptive-streaming/webm-dash-specification
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* ISO DASH Specification:
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* http://standards.iso.org/ittf/PubliclyAvailableStandards/c065274_ISO_IEC_23009-1_2014.zip
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*/
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#include <float.h>
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#include <stdint.h>
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#include <string.h>
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@ -34,6 +37,7 @@
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#include "libavutil/avstring.h"
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#include "libavutil/dict.h"
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#include "libavutil/opt.h"
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#include "libavutil/time_internal.h"
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typedef struct AdaptationSet {
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char id[10];
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@ -47,6 +51,12 @@ typedef struct WebMDashMuxContext {
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AdaptationSet *as;
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int nb_as;
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int representation_id;
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int is_live;
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int chunk_start_index;
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int chunk_duration;
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char *utc_timing_url;
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double time_shift_buffer_depth;
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int debug_mode;
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} WebMDashMuxContext;
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static const char *get_codec_name(int codec_id)
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@ -79,19 +89,42 @@ static double get_duration(AVFormatContext *s)
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static void write_header(AVFormatContext *s)
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{
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WebMDashMuxContext *w = s->priv_data;
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double min_buffer_time = 1.0;
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time_t local_time;
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struct tm *gmt, gmt_buffer;
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char *gmt_iso = av_malloc(21);
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avio_printf(s->pb, "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n");
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avio_printf(s->pb, "<MPD\n");
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avio_printf(s->pb, " xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\"\n");
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avio_printf(s->pb, " xmlns=\"urn:mpeg:DASH:schema:MPD:2011\"\n");
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avio_printf(s->pb, " xsi:schemaLocation=\"urn:mpeg:DASH:schema:MPD:2011\"\n");
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avio_printf(s->pb, " type=\"static\"\n");
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avio_printf(s->pb, " mediaPresentationDuration=\"PT%gS\"\n",
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get_duration(s));
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avio_printf(s->pb, " minBufferTime=\"PT%gS\"\n",
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min_buffer_time);
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avio_printf(s->pb, " profiles=\"urn:webm:dash:profile:webm-on-demand:2012\"");
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avio_printf(s->pb, ">\n");
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avio_printf(s->pb, " type=\"%s\"\n", w->is_live ? "dynamic" : "static");
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if (!w->is_live) {
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avio_printf(s->pb, " mediaPresentationDuration=\"PT%gS\"\n",
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get_duration(s));
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}
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avio_printf(s->pb, " minBufferTime=\"PT%gS\"\n", min_buffer_time);
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avio_printf(s->pb, " profiles=\"%s\"%s",
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w->is_live ? "urn:mpeg:dash:profile:isoff-live:2011" : "urn:webm:dash:profile:webm-on-demand:2012",
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w->is_live ? "\n" : ">\n");
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time(&local_time);
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gmt = gmtime_r(&local_time, &gmt_buffer);
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strftime(gmt_iso, 21, "%FT%TZ", gmt);
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if (w->debug_mode) {
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av_strlcpy(gmt_iso, "", 1);
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}
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if (w->is_live) {
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avio_printf(s->pb, " availabilityStartTime=\"%s\"\n", gmt_iso);
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avio_printf(s->pb, " timeShiftBufferDepth=\"PT%gS\"", w->time_shift_buffer_depth);
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avio_printf(s->pb, ">\n");
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avio_printf(s->pb, "<UTCTiming\n");
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avio_printf(s->pb, " schemeIdUri=\"%s\"\n",
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w->utc_timing_url ? "urn:mpeg:dash:utc:http-iso:2014" : "urn:mpeg:dash:utc:direct:2012");
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avio_printf(s->pb, " value=\"%s\"/>\n",
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w->utc_timing_url ? w->utc_timing_url : gmt_iso);
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}
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av_free(gmt_iso);
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}
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static void write_footer(AVFormatContext *s)
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@ -137,33 +170,47 @@ static int bitstream_switching(AVFormatContext *s, AdaptationSet *as) {
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* Writes a Representation within an Adaptation Set. Returns 0 on success and
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* < 0 on failure.
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*/
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static int write_representation(AVFormatContext *s, AVStream *stream, int id,
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static int write_representation(AVFormatContext *s, AVStream *stream, char *id,
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int output_width, int output_height,
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int output_sample_rate) {
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WebMDashMuxContext *w = s->priv_data;
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AVDictionaryEntry *irange = av_dict_get(stream->metadata, INITIALIZATION_RANGE, NULL, 0);
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AVDictionaryEntry *cues_start = av_dict_get(stream->metadata, CUES_START, NULL, 0);
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AVDictionaryEntry *cues_end = av_dict_get(stream->metadata, CUES_END, NULL, 0);
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AVDictionaryEntry *filename = av_dict_get(stream->metadata, FILENAME, NULL, 0);
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AVDictionaryEntry *bandwidth = av_dict_get(stream->metadata, BANDWIDTH, NULL, 0);
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if (!irange || cues_start == NULL || cues_end == NULL || filename == NULL ||
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!bandwidth) {
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if ((w->is_live && (!filename)) ||
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(!w->is_live && (!irange || !cues_start || !cues_end || !filename || !bandwidth))) {
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return -1;
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}
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avio_printf(s->pb, "<Representation id=\"%d\"", id);
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avio_printf(s->pb, " bandwidth=\"%s\"", bandwidth->value);
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avio_printf(s->pb, "<Representation id=\"%s\"", id);
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// FIXME: For live, This should be obtained from the input file or as an AVOption.
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avio_printf(s->pb, " bandwidth=\"%s\"",
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w->is_live ? (stream->codec->codec_type == AVMEDIA_TYPE_AUDIO ? "128000" : "1000000") : bandwidth->value);
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if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO && output_width)
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avio_printf(s->pb, " width=\"%d\"", stream->codec->width);
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if (stream->codec->codec_type == AVMEDIA_TYPE_VIDEO && output_height)
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avio_printf(s->pb, " height=\"%d\"", stream->codec->height);
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if (stream->codec->codec_type = AVMEDIA_TYPE_AUDIO && output_sample_rate)
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avio_printf(s->pb, " audioSamplingRate=\"%d\"", stream->codec->sample_rate);
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avio_printf(s->pb, ">\n");
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avio_printf(s->pb, "<BaseURL>%s</BaseURL>\n", filename->value);
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avio_printf(s->pb, "<SegmentBase\n");
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avio_printf(s->pb, " indexRange=\"%s-%s\">\n", cues_start->value, cues_end->value);
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avio_printf(s->pb, "<Initialization\n");
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avio_printf(s->pb, " range=\"0-%s\" />\n", irange->value);
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avio_printf(s->pb, "</SegmentBase>\n");
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if (w->is_live) {
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// For live streams, Codec and Mime Type always go in the Representation tag.
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avio_printf(s->pb, " codecs=\"%s\"", get_codec_name(stream->codec->codec_id));
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avio_printf(s->pb, " mimeType=\"%s/webm\"",
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stream->codec->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
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// For live streams, subsegments always start with key frames. So this
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// is always 1.
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avio_printf(s->pb, " startsWithSAP=\"1\"");
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avio_printf(s->pb, ">");
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} else {
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avio_printf(s->pb, ">\n");
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avio_printf(s->pb, "<BaseURL>%s</BaseURL>\n", filename->value);
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avio_printf(s->pb, "<SegmentBase\n");
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avio_printf(s->pb, " indexRange=\"%s-%s\">\n", cues_start->value, cues_end->value);
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avio_printf(s->pb, "<Initialization\n");
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avio_printf(s->pb, " range=\"0-%s\" />\n", irange->value);
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avio_printf(s->pb, "</SegmentBase>\n");
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}
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avio_printf(s->pb, "</Representation>\n");
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return 0;
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}
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@ -207,6 +254,51 @@ static int check_matching_sample_rate(AVFormatContext *s, AdaptationSet *as) {
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return 1;
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}
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/*
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* Parses a live header filename and computes the representation id,
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* initialization pattern and the media pattern. Pass NULL if you don't want to
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* compute any of those 3. Returns 0 on success and non-zero on failure.
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*
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* Name of the header file should conform to the following pattern:
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* <file_description>_<representation_id>.hdr where <file_description> can be
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* anything. The chunks should be named according to the following pattern:
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* <file_description>_<representation_id>_<chunk_number>.chk
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*/
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static int parse_filename(char *filename, char **representation_id,
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char **initialization_pattern, char **media_pattern) {
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char *underscore_pos = NULL;
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char *period_pos = NULL;
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char *temp_pos = NULL;
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char *filename_str = av_strdup(filename);
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if (!filename_str) return AVERROR(ENOMEM);
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temp_pos = av_stristr(filename_str, "_");
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while (temp_pos) {
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underscore_pos = temp_pos + 1;
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temp_pos = av_stristr(temp_pos + 1, "_");
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}
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if (!underscore_pos) return -1;
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period_pos = av_stristr(underscore_pos, ".");
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if (!period_pos) return -1;
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*(underscore_pos - 1) = 0;
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if (representation_id) {
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*representation_id = av_malloc(period_pos - underscore_pos + 1);
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if (!(*representation_id)) return AVERROR(ENOMEM);
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av_strlcpy(*representation_id, underscore_pos, period_pos - underscore_pos + 1);
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}
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if (initialization_pattern) {
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*initialization_pattern = av_asprintf("%s_$RepresentationID$.hdr",
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filename_str);
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if (!(*initialization_pattern)) return AVERROR(ENOMEM);
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}
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if (media_pattern) {
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*media_pattern = av_asprintf("%s_$RepresentationID$_$Number$.chk",
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filename_str);
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if (!(*media_pattern)) return AVERROR(ENOMEM);
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}
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av_free(filename_str);
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return 0;
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}
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/*
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* Writes an Adaptation Set. Returns 0 on success and < 0 on failure.
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*/
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@ -222,13 +314,14 @@ static int write_adaptation_set(AVFormatContext *s, int as_index)
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// Width, Height and Sample Rate will go in the AdaptationSet tag if they
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// are the same for all contained Representations. otherwise, they will go
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// on their respective Representation tag.
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// on their respective Representation tag. For live streams, they always go
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// in the Representation tag.
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int width_in_as = 1, height_in_as = 1, sample_rate_in_as = 1;
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if (codec->codec_type == AVMEDIA_TYPE_VIDEO) {
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width_in_as = check_matching_width(s, as);
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height_in_as = check_matching_height(s, as);
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width_in_as = !w->is_live && check_matching_width(s, as);
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height_in_as = !w->is_live && check_matching_height(s, as);
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} else {
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sample_rate_in_as = check_matching_sample_rate(s, as);
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sample_rate_in_as = !w->is_live && check_matching_sample_rate(s, as);
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}
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avio_printf(s->pb, "<AdaptationSet id=\"%s\"", as->id);
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@ -249,19 +342,53 @@ static int write_adaptation_set(AVFormatContext *s, int as_index)
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avio_printf(s->pb, " bitstreamSwitching=\"%s\"",
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boolean[bitstream_switching(s, as)]);
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avio_printf(s->pb, " subsegmentAlignment=\"%s\"",
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boolean[subsegment_alignment(s, as)]);
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boolean[w->is_live || subsegment_alignment(s, as)]);
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for (i = 0; i < as->nb_streams; i++) {
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AVDictionaryEntry *kf = av_dict_get(s->streams[as->streams[i]]->metadata,
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CLUSTER_KEYFRAME, NULL, 0);
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if (!kf || !strncmp(kf->value, "0", 1)) subsegmentStartsWithSAP = 0;
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if (!w->is_live && (!kf || !strncmp(kf->value, "0", 1))) subsegmentStartsWithSAP = 0;
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}
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avio_printf(s->pb, " subsegmentStartsWithSAP=\"%d\"", subsegmentStartsWithSAP);
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avio_printf(s->pb, ">\n");
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if (w->is_live) {
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AVDictionaryEntry *filename =
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av_dict_get(s->streams[as->streams[0]]->metadata, FILENAME, NULL, 0);
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char *initialization_pattern = NULL;
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char *media_pattern = NULL;
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int ret = parse_filename(filename->value, NULL, &initialization_pattern,
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&media_pattern);
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if (ret) return ret;
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avio_printf(s->pb, "<ContentComponent id=\"1\" type=\"%s\"/>\n",
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codec->codec_type == AVMEDIA_TYPE_VIDEO ? "video" : "audio");
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avio_printf(s->pb, "<SegmentTemplate");
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avio_printf(s->pb, " timescale=\"1000\"");
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avio_printf(s->pb, " duration=\"%d\"", w->chunk_duration);
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avio_printf(s->pb, " media=\"%s\"", media_pattern);
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avio_printf(s->pb, " startNumber=\"%d\"", w->chunk_start_index);
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avio_printf(s->pb, " initialization=\"%s\"", initialization_pattern);
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avio_printf(s->pb, "/>\n");
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av_free(initialization_pattern);
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av_free(media_pattern);
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}
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for (i = 0; i < as->nb_streams; i++) {
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write_representation(s, s->streams[as->streams[i]], w->representation_id++,
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char *representation_id = NULL;
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if (w->is_live) {
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AVDictionaryEntry *filename =
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av_dict_get(s->streams[as->streams[i]]->metadata, FILENAME, NULL, 0);
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if (!filename ||
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parse_filename(filename->value, &representation_id, NULL, NULL)) {
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return -1;
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}
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} else {
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representation_id = av_asprintf("%d", w->representation_id++);
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if (!representation_id) return -1;
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}
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write_representation(s, s->streams[as->streams[i]], representation_id,
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!width_in_as, !height_in_as, !sample_rate_in_as);
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av_free(representation_id);
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}
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avio_printf(s->pb, "</AdaptationSet>\n");
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return 0;
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@ -333,7 +460,9 @@ static int webm_dash_manifest_write_header(AVFormatContext *s)
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write_header(s);
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avio_printf(s->pb, "<Period id=\"0\"");
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avio_printf(s->pb, " start=\"PT%gS\"", start);
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avio_printf(s->pb, " duration=\"PT%gS\"", get_duration(s));
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if (!w->is_live) {
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avio_printf(s->pb, " duration=\"PT%gS\"", get_duration(s));
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}
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avio_printf(s->pb, " >\n");
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for (i = 0; i < w->nb_as; i++) {
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@ -364,6 +493,12 @@ static int webm_dash_manifest_write_trailer(AVFormatContext *s)
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#define OFFSET(x) offsetof(WebMDashMuxContext, x)
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static const AVOption options[] = {
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{ "adaptation_sets", "Adaptation sets. Syntax: id=0,streams=0,1,2 id=1,streams=3,4 and so on", OFFSET(adaptation_sets), AV_OPT_TYPE_STRING, { 0 }, 0, 0, AV_OPT_FLAG_ENCODING_PARAM },
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{ "debug_mode", "[private option - users should never set this]. set this to 1 to create deterministic output", OFFSET(debug_mode), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
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{ "live", "set this to 1 to create a live stream manifest", OFFSET(is_live), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, AV_OPT_FLAG_ENCODING_PARAM },
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{ "chunk_start_index", "start index of the chunk", OFFSET(chunk_start_index), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
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{ "chunk_duration_ms", "duration of each chunk (in milliseconds)", OFFSET(chunk_duration), AV_OPT_TYPE_INT, {.i64 = 1000}, 0, INT_MAX, AV_OPT_FLAG_ENCODING_PARAM },
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{ "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 },
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{ "time_shift_buffer_depth", "Smallest time (in seconds) shifting buffer for which any Representation is guaranteed to be available.", OFFSET(time_shift_buffer_depth), AV_OPT_TYPE_DOUBLE, { .dbl = 60.0 }, 1.0, DBL_MAX, AV_OPT_FLAG_ENCODING_PARAM },
|
||||
{ NULL },
|
||||
};
|
||||
|
||||
|
||||
@ -43,6 +43,9 @@ fate-webm-dash-manifest-unaligned-audio-streams: CMD = run ffmpeg -f webm_dash_m
|
||||
FATE_VP8-$(call DEMDEC, WEBM_DASH_MANIFEST, VP8) += fate-webm-dash-manifest-representations
|
||||
fate-webm-dash-manifest-representations: CMD = run ffmpeg -f webm_dash_manifest -i $(TARGET_SAMPLES)/vp8/dash_video1.webm -f webm_dash_manifest -i $(TARGET_SAMPLES)/vp8/dash_video4.webm -c copy -map 0 -map 1 -f webm_dash_manifest -adaptation_sets "id=0,streams=0,1" -
|
||||
|
||||
FATE_VP8-$(call DEMDEC, WEBM_DASH_MANIFEST, VP8) += fate-webm-dash-manifest-live
|
||||
fate-webm-dash-manifest-live: CMD = run ffmpeg -f webm_dash_manifest -live 1 -i $(TARGET_SAMPLES)/vp8/dash_live_video_360.hdr -f webm_dash_manifest -live 1 -i $(TARGET_SAMPLES)/vp8/dash_live_audio_171.hdr -c copy -map 0 -map 1 -f webm_dash_manifest -live 1 -adaptation_sets "id=0,streams=0 id=1,streams=1" -chunk_start_index 1 -chunk_duration_ms 5000 -time_shift_buffer_depth 7200 -debug_mode 1 -
|
||||
|
||||
FATE_SAMPLES_AVCONV += $(FATE_VP6-yes)
|
||||
fate-vp6: $(FATE_VP6-yes)
|
||||
|
||||
|
||||
26
tests/ref/fate/webm-dash-manifest-live
Normal file
26
tests/ref/fate/webm-dash-manifest-live
Normal file
@ -0,0 +1,26 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<MPD
|
||||
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
|
||||
xmlns="urn:mpeg:DASH:schema:MPD:2011"
|
||||
xsi:schemaLocation="urn:mpeg:DASH:schema:MPD:2011"
|
||||
type="dynamic"
|
||||
minBufferTime="PT1S"
|
||||
profiles="urn:mpeg:dash:profile:isoff-live:2011"
|
||||
availabilityStartTime=""
|
||||
timeShiftBufferDepth="PT7200S">
|
||||
<UTCTiming
|
||||
schemeIdUri="urn:mpeg:dash:utc:direct:2012"
|
||||
value=""/>
|
||||
<Period id="0" start="PT0S" >
|
||||
<AdaptationSet id="0" mimeType="video/webm" codecs="vp9" bitstreamSwitching="true" subsegmentAlignment="true" subsegmentStartsWithSAP="1">
|
||||
<ContentComponent id="1" type="video"/>
|
||||
<SegmentTemplate timescale="1000" duration="5000" media="dash_live_video_$RepresentationID$_$Number$.chk" startNumber="1" initialization="dash_live_video_$RepresentationID$.hdr"/>
|
||||
<Representation id="360" bandwidth="1000000" width="640" height="360" codecs="vp9" mimeType="video/webm" startsWithSAP="1"></Representation>
|
||||
</AdaptationSet>
|
||||
<AdaptationSet id="1" mimeType="audio/webm" codecs="vorbis" bitstreamSwitching="true" subsegmentAlignment="true" subsegmentStartsWithSAP="1">
|
||||
<ContentComponent id="1" type="audio"/>
|
||||
<SegmentTemplate timescale="1000" duration="5000" media="dash_live_audio_$RepresentationID$_$Number$.chk" startNumber="1" initialization="dash_live_audio_$RepresentationID$.hdr"/>
|
||||
<Representation id="171" bandwidth="128000" audioSamplingRate="32000" codecs="vorbis" mimeType="audio/webm" startsWithSAP="1"></Representation>
|
||||
</AdaptationSet>
|
||||
</Period>
|
||||
</MPD>
|
||||
Loading…
Reference in New Issue
Block a user