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dashdemux: support downloading segments in reverse order

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When a seek with a negative rate is requested, find the target
segment where gstsegment.stop belongs in and then download from
this segment backwards until the first segment.

This allows proper reverse playback.
This commit is contained in:
George Kiagiadakis 2014-08-06 18:11:20 +03:00
parent dab074899e
commit ea90ceac01
3 changed files with 10 additions and 5 deletions
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8
ext/dash/gstdashdemux.c
View file

@ -511,7 +511,10 @@ gst_dash_demux_src_event (GstPad * pad, GstObject * parent, GstEvent * event)
gst_dash_demux_wait_stop (demux);
/* select the requested Period in the Media Presentation */
target_pos = (GstClockTime) demux->segment.start;
if (demux->segment.rate > 0.0)
target_pos = (GstClockTime) demux->segment.start;
else
target_pos = (GstClockTime) demux->segment.stop;
GST_DEBUG_OBJECT (demux, "Seeking to target %" GST_TIME_FORMAT,
GST_TIME_ARGS (target_pos));
current_period = 0;
@ -2216,7 +2219,8 @@ gst_dash_demux_stream_download_fragment (GstDashDemux * demux,
}
g_mutex_lock (&stream->fragment_download_lock);
if (gst_mpd_client_get_next_fragment (demux->client, stream_idx, fragment)) {
if (gst_mpd_client_get_next_fragment (demux->client, stream_idx, fragment,
stream->demux->segment.rate > 0.0)) {
GST_INFO_OBJECT (stream->pad,
"Fetching next fragment %s ts:%" GST_TIME_FORMAT " dur:%"
GST_TIME_FORMAT " Range:%" G_GINT64_FORMAT "-%" G_GINT64_FORMAT,

5
ext/dash/gstmpdparser.c
View file

@ -3574,7 +3574,7 @@ gst_mpd_client_get_next_fragment_timestamp (GstMpdClient * client,
gboolean
gst_mpd_client_get_next_fragment (GstMpdClient * client,
guint indexStream, GstMediaFragmentInfo * fragment)
guint indexStream, GstMediaFragmentInfo * fragment, gboolean forward)
{
GstActiveStream *stream = NULL;
GstMediaSegment currentChunk;
@ -3679,7 +3679,8 @@ gst_mpd_client_get_next_fragment (GstMpdClient * client,
}
}
gst_mpd_client_set_segment_index (stream, segment_idx + 1);
gst_mpd_client_set_segment_index (stream,
forward ? segment_idx + 1 : segment_idx - 1);
GST_MPD_CLIENT_UNLOCK (client);
GST_DEBUG ("Loading chunk with URL %s", fragment->uri);

2
ext/dash/gstmpdparser.h
View file

@ -492,7 +492,7 @@ GstClockTime gst_mpd_client_get_next_fragment_duration (GstMpdClient * client, G
GstClockTime gst_mpd_client_get_media_presentation_duration (GstMpdClient *client);
gboolean gst_mpd_client_get_last_fragment_timestamp (GstMpdClient * client, guint stream_idx, GstClockTime * ts);
gboolean gst_mpd_client_get_next_fragment_timestamp (GstMpdClient * client, guint stream_idx, GstClockTime * ts);
gboolean gst_mpd_client_get_next_fragment (GstMpdClient *client, guint indexStream, GstMediaFragmentInfo * fragment);
gboolean gst_mpd_client_get_next_fragment (GstMpdClient *client, guint indexStream, GstMediaFragmentInfo * fragment, gboolean forward);
gboolean gst_mpd_client_get_next_header (GstMpdClient *client, gchar **uri, guint stream_idx, gint64 * range_start, gint64 * range_end);
gboolean gst_mpd_client_get_next_header_index (GstMpdClient *client, gchar **uri, guint stream_idx, gint64 * range_start, gint64 * range_end);
gboolean gst_mpd_client_is_live (GstMpdClient * client);