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matroskademux: add support for skipping invalid data in push mode

Browse source 
https://bugzilla.gnome.org/show_bug.cgi?id=774566
This commit is contained in:
Nicola Murino 2016-11-21 11:48:58 +01:00 committed by Sebastian Dröge
parent 20ed9e8237
commit 0ef3a71b89
1 changed files with 40 additions and 5 deletions
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43
gst/matroska/matroska-demux.c
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@ -87,6 +87,7 @@ enum
};
#define DEFAULT_MAX_GAP_TIME (2 * GST_SECOND)
#define INVALID_DATA_THRESHOLD (2 * 1024 * 1024)
static GstStaticPadTemplate sink_templ = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
@ -4375,8 +4376,21 @@ gst_matroska_demux_parse_id (GstMatroskaDemux * demux, guint32 id,
break;
case GST_MATROSKA_READ_STATE_SCANNING:
if (id != GST_MATROSKA_ID_CLUSTER &&
id != GST_MATROSKA_ID_CLUSTERTIMECODE)
id != GST_MATROSKA_ID_CLUSTERTIMECODE) {
if (demux->common.start_resync_offset != -1) {
/* we need to skip byte per byte if we are scanning for a new cluster
* after invalid data is found
*/
read = 1;
}
goto skip;
} else {
if (demux->common.start_resync_offset != -1) {
GST_LOG_OBJECT (demux, "Resync done, new cluster found!");
demux->common.start_resync_offset = -1;
demux->common.state = demux->common.state_to_restore;
}
}
/* fall-through */
case GST_MATROSKA_READ_STATE_HEADER:
case GST_MATROSKA_READ_STATE_DATA:
@ -4831,10 +4845,30 @@ next:
if (G_UNLIKELY (ret != GST_FLOW_OK && ret != GST_FLOW_EOS)) {
if (demux->common.ebml_segment_length != G_MAXUINT64
&& demux->common.offset >=
demux->common.ebml_segment_start + demux->common.ebml_segment_length)
ret = GST_FLOW_EOS;
demux->common.ebml_segment_start + demux->common.ebml_segment_length) {
return GST_FLOW_OK;
} else {
gint64 bytes_scanned;
if (demux->common.start_resync_offset == -1) {
demux->common.start_resync_offset = demux->common.offset;
demux->common.state_to_restore = demux->common.state;
}
bytes_scanned = demux->common.offset - demux->common.start_resync_offset;
if (bytes_scanned <= INVALID_DATA_THRESHOLD) {
GST_WARNING_OBJECT (demux,
"parse error, looking for next cluster, actual offset %"
G_GUINT64_FORMAT ", start resync offset %" G_GUINT64_FORMAT,
demux->common.offset, demux->common.start_resync_offset);
demux->common.state = GST_MATROSKA_READ_STATE_SCANNING;
ret = GST_FLOW_OK;
} else {
GST_WARNING_OBJECT (demux,
"unrecoverable parse error, next cluster not found and threshold "
"exceeded, bytes scanned %" G_GINT64_FORMAT, bytes_scanned);
return ret;
}
}
}
GST_LOG_OBJECT (demux, "Offset %" G_GUINT64_FORMAT ", Element id 0x%x, "
"size %" G_GUINT64_FORMAT ", needed %d, available %d",
@ -4927,7 +4961,8 @@ gst_matroska_demux_handle_sink_event (GstPad * pad, GstObject * parent,
}
case GST_EVENT_EOS:
{
if (demux->common.state != GST_MATROSKA_READ_STATE_DATA) {
if (demux->common.state != GST_MATROSKA_READ_STATE_DATA
&& demux->common.state != GST_MATROSKA_READ_STATE_SCANNING) {
gst_event_unref (event);
GST_ELEMENT_ERROR (demux, STREAM, DEMUX,
(NULL), ("got eos and didn't receive a complete header object"));