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dashdemux: Collect average moof and first sync sample sizes

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And always request those in the beginning so that ideally we get the moof and
the first sync sample all together with the first HTTP request.

https://bugzilla.gnome.org/show_bug.cgi?id=741104
This commit is contained in:
Sebastian Dröge 2016-08-02 08:47:55 +03:00
parent 7f1f777b92
commit 9c04d1e13c
2 changed files with 36 additions and 2 deletions
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37
ext/dash/gstdashdemux.c
View file

@ -1877,7 +1877,6 @@ gst_dash_demux_need_another_chunk (GstAdaptiveDemuxStream * stream)
/* We're chunked downloading for ISOBMFF in KEY_UNITS mode for the actual
* fragment until we parsed the moof and arrived at the mdat. 8192 is a
* random guess for the moof size
* TODO: Calculate running average for the moof size and use that instead
*/
if (dashstream->is_isobmff
&& (GST_ADAPTIVE_DEMUX (stream->demux)->
@ -1887,7 +1886,16 @@ gst_dash_demux_need_another_chunk (GstAdaptiveDemuxStream * stream)
&& dashdemux->allow_trickmode_key_units) {
if (dashstream->isobmff_parser.current_fourcc != GST_ISOFF_FOURCC_MDAT) {
/* Need to download the moof first to know anything */
stream->fragment.chunk_size = 8192;
/* Do we have the first fourcc already or are we in the middle */
if (dashstream->isobmff_parser.current_fourcc == 0) {
stream->fragment.chunk_size += dashstream->moof_average_size;
if (dashstream->first_sync_sample_always_after_moof)
stream->fragment.chunk_size +=
dashstream->first_sync_sample_average_size;
}
} else if (dashstream->moof && dashstream->moof_sync_samples) {
/* Have the moof, either we're done now or we want to download the
* directly following sync sample */
@ -1915,7 +1923,9 @@ gst_dash_demux_need_another_chunk (GstAdaptiveDemuxStream * stream)
/* We might've decided that we can't allow key-unit only
* trickmodes while doing chunked downloading. In that case
* just download from here to the end now */
if (dashstream->moof)
if (dashstream->moof
&& (GST_ADAPTIVE_DEMUX (stream->demux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS))
stream->fragment.chunk_size = -1;
else
stream->fragment.chunk_size = 0;
@ -2033,6 +2043,17 @@ gst_dash_demux_parse_isobmff (GstAdaptiveDemux * demux,
dash_stream->isobmff_parser.current_start_offset;
dash_stream->moof_size = size;
dash_stream->current_sync_sample = -1;
if (dash_stream->moof_average_size) {
if (dash_stream->moof_average_size < size)
dash_stream->moof_average_size =
(size * 3 + dash_stream->moof_average_size) / 4;
else
dash_stream->moof_average_size =
(size + dash_stream->moof_average_size + 3) / 4;
} else {
dash_stream->moof_average_size = size;
}
} else {
gst_byte_reader_skip (&reader, size - header_size);
}
@ -2249,6 +2270,18 @@ gst_dash_demux_find_sync_samples (GstAdaptiveDemux * demux,
GstDashStreamSyncSample *sync_sample =
&g_array_index (dash_stream->moof_sync_samples, GstDashStreamSyncSample,
0);
guint size = sync_sample->end_offset + 1 - sync_sample->start_offset;
if (dash_stream->first_sync_sample_average_size) {
if (dash_stream->first_sync_sample_average_size < size)
dash_stream->first_sync_sample_average_size =
(size * 3 + dash_stream->first_sync_sample_average_size) / 4;
else
dash_stream->first_sync_sample_average_size =
(size + dash_stream->first_sync_sample_average_size * 3) / 4;
} else {
dash_stream->first_sync_sample_average_size = size;
}
if (dash_stream->moof_offset + dash_stream->moof_size + 8 <
sync_sample->start_offset) {

1
ext/dash/gstdashdemux.h
View file

@ -94,6 +94,7 @@ struct _GstDashDemuxStream
GArray *moof_sync_samples;
guint current_sync_sample;
guint64 moof_average_size, first_sync_sample_average_size;
gboolean first_sync_sample_after_moof, first_sync_sample_always_after_moof;
};