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dashdemux: Use chunked downloading for the moof in KEY_UNITS mode

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Allows us to reuse the HTTP connection and reduce latencies a lot.

https://bugzilla.gnome.org/show_bug.cgi?id=741104
This commit is contained in:
Sebastian Dröge 2016-07-12 20:09:52 +03:00
parent a9e38d3fec
commit 47ef88f20e
1 changed files with 59 additions and 6 deletions
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65
ext/dash/gstdashdemux.c
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@ -266,6 +266,8 @@ gst_dash_demux_stream_fragment_start (GstAdaptiveDemux * demux,
static GstFlowReturn
gst_dash_demux_stream_fragment_finished (GstAdaptiveDemux * demux,
GstAdaptiveDemuxStream * stream);
static gboolean gst_dash_demux_need_another_chunk (GstAdaptiveDemuxStream *
stream);
/* GstDashDemux */
static gboolean gst_dash_demux_setup_all_streams (GstDashDemux * demux);
@ -480,6 +482,8 @@ gst_dash_demux_class_init (GstDashDemuxClass * klass)
gstadaptivedemux_class->finish_fragment =
gst_dash_demux_stream_fragment_finished;
gstadaptivedemux_class->data_received = gst_dash_demux_data_received;
gstadaptivedemux_class->need_another_chunk =
gst_dash_demux_need_another_chunk;
}
static void
@ -1060,6 +1064,9 @@ gst_dash_demux_stream_update_fragment_info (GstAdaptiveDemuxStream * stream)
isombff = gst_mpd_client_has_isoff_ondemand_profile (dashdemux->client);
/* Reset chunk size if any */
stream->fragment.chunk_size = 0;
if (GST_ADAPTIVE_DEMUX_STREAM_NEED_HEADER (stream) && isombff) {
gst_dash_demux_stream_update_headers_info (stream);
dashstream->sidx_base_offset = stream->fragment.index_range_end + 1;
@ -1273,10 +1280,10 @@ gst_dash_demux_stream_advance_sync_sample (GstAdaptiveDemuxStream * stream)
fragment_finished = TRUE;
}
} else {
if (dashstream->current_sync_sample == -1)
if (dashstream->current_sync_sample == -1) {
dashstream->current_sync_sample =
dashstream->moof_sync_samples->len - 1;
else if (dashstream->current_sync_sample == 0) {
} else if (dashstream->current_sync_sample == 0) {
dashstream->current_sync_sample = -1;
fragment_finished = TRUE;
} else
@ -1852,6 +1859,38 @@ gst_dash_demux_stream_fragment_finished (GstAdaptiveDemux * demux,
stream->fragment.duration);
}
static gboolean
gst_dash_demux_need_another_chunk (GstAdaptiveDemuxStream * stream)
{
GstDashDemuxStream *dashstream = (GstDashDemuxStream *) 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
* TODO: If the first keyframe is right after the moof, download it directly
* and give it as chunk size here, also include it in the running average */
if (dashstream->is_isobmff
&& (GST_ADAPTIVE_DEMUX (stream->demux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS)
&& dashstream->active_stream->mimeType == GST_STREAM_VIDEO
&& !stream->downloading_header && !stream->downloading_index) {
if (dashstream->isobmff_parser.current_fourcc != GST_ISOFF_FOURCC_MDAT) {
stream->fragment.chunk_size = 8192;
} else if (dashstream->moof && dashstream->moof_sync_samples) {
stream->fragment.chunk_size = 0;
} else {
stream->fragment.chunk_size = -1;
}
return stream->fragment.chunk_size != 0;
}
stream->fragment.chunk_size = 0;
return FALSE;
}
static GstBuffer *
gst_dash_demux_parse_isobmff (GstAdaptiveDemux * demux,
GstDashDemuxStream * dash_stream, GstBuffer * buffer)
@ -1893,9 +1932,10 @@ gst_dash_demux_parse_isobmff (GstAdaptiveDemux * demux,
dash_stream->isobmff_parser.index_header_or_data = index_header_or_data;
}
if (dash_stream->isobmff_parser.current_offset == -1)
if (dash_stream->isobmff_parser.current_offset == -1) {
dash_stream->isobmff_parser.current_offset =
GST_BUFFER_OFFSET_IS_VALID (buffer) ? GST_BUFFER_OFFSET (buffer) : 0;
}
gst_adapter_push (dash_stream->isobmff_adapter, buffer);
@ -2170,12 +2210,16 @@ gst_dash_demux_data_received (GstAdaptiveDemux * demux,
return ret;
if (dash_stream->isobmff_parser.current_fourcc == GST_ISOFF_FOURCC_MDAT) {
/* Jump to the next sync sample */
/* Jump to the next sync sample. As we're doing chunked downloading
* here, just drop data until our chunk is over so we can reuse the
* HTTP connection instead of having to create a new one */
if (dash_stream->active_stream->mimeType == GST_STREAM_VIDEO
&& gst_dash_demux_find_sync_samples (demux, stream) &&
GST_ADAPTIVE_DEMUX (stream->demux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS)
return GST_ADAPTIVE_DEMUX_FLOW_END_OF_FRAGMENT;
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS) {
gst_adapter_clear (dash_stream->isobmff_adapter);
return GST_FLOW_OK;
}
if (gst_adapter_available (dash_stream->isobmff_adapter) > 0) {
buffer =
@ -2192,6 +2236,15 @@ gst_dash_demux_data_received (GstAdaptiveDemux * demux,
}
return ret;
} else if (dash_stream->active_stream->mimeType == GST_STREAM_VIDEO
&& dash_stream->moof_sync_samples
&& (GST_ADAPTIVE_DEMUX (stream->demux)->
segment.flags & GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS)
&& dash_stream->current_sync_sample == -1) {
/* We're doing chunked downloading and wait for finishing the current
* chunk so we can jump to the first keyframe */
gst_buffer_unref (buffer);
return GST_FLOW_OK;
}
}