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matroskademux: cater for safer arithmetic with global start time

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This commit is contained in:
Mark Nauwelaerts 2011-12-13 18:15:18 +01:00
parent fd88096577
commit 00ed34d2eb
1 changed files with 16 additions and 8 deletions
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24
gst/matroska/matroska-demux.c
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@ -1373,10 +1373,12 @@ gst_matroska_demux_query (GstMatroskaDemux * demux, GstPad * pad,
GST_OBJECT_LOCK (demux);
if (context)
gst_query_set_position (query, GST_FORMAT_TIME,
context->pos - demux->stream_start_time);
MAX (context->pos, demux->stream_start_time) -
demux->stream_start_time);
else
gst_query_set_position (query, GST_FORMAT_TIME,
demux->common.segment.last_stop - demux->stream_start_time);
MAX (demux->common.segment.last_stop, demux->stream_start_time) -
demux->stream_start_time);
GST_OBJECT_UNLOCK (demux);
} else if (format == GST_FORMAT_DEFAULT && context
&& context->default_duration) {
@ -1745,8 +1747,11 @@ gst_matroska_demux_search_pos (GstMatroskaDemux * demux, GstClockTime time)
otime = demux->common.segment.last_stop;
GST_OBJECT_UNLOCK (demux);
/* sanitize */
time = MAX (time, demux->stream_start_time);
/* avoid division by zero in first estimation below */
if (otime == 0)
if (otime <= demux->stream_start_time)
otime = time;
retry:
@ -2015,9 +2020,9 @@ next:
if (keyunit) {
GST_DEBUG_OBJECT (demux, "seek to key unit, adjusting segment start to %"
GST_TIME_FORMAT, GST_TIME_ARGS (entry->time));
seeksegment.start = entry->time;
seeksegment.last_stop = entry->time;
seeksegment.time = entry->time - demux->stream_start_time;
seeksegment.start = MAX (entry->time, demux->stream_start_time);
seeksegment.last_stop = seeksegment.start;
seeksegment.time = seeksegment.start - demux->stream_start_time;
}
exit:
@ -3287,6 +3292,8 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
/* need to refresh segment info ASAP */
if (GST_CLOCK_TIME_IS_VALID (lace_time) && demux->need_newsegment) {
guint64 clace_time;
GST_DEBUG_OBJECT (demux,
"generating segment starting at %" GST_TIME_FORMAT,
GST_TIME_ARGS (lace_time));
@ -3296,9 +3303,10 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
"Setting stream start time to %" GST_TIME_FORMAT,
GST_TIME_ARGS (lace_time));
}
clace_time = MAX (lace_time, demux->stream_start_time);
gst_segment_set_newsegment (&demux->common.segment, FALSE,
demux->common.segment.rate, GST_FORMAT_TIME, lace_time,
GST_CLOCK_TIME_NONE, lace_time - demux->stream_start_time);
demux->common.segment.rate, GST_FORMAT_TIME, clace_time,
GST_CLOCK_TIME_NONE, clace_time - demux->stream_start_time);
/* now convey our segment notion downstream */
gst_matroska_demux_send_event (demux, gst_event_new_new_segment (FALSE,
demux->common.segment.rate, demux->common.segment.format,