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qtdemux: fix seeking in fragmented file without mfra random access info

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... which no longer worked due to unconditionally clearing sample info and
ending up in inconsistent state.  Let's tread a bit more carefully and also
allow for the old seek handling that resorts to scanning if no mfra info
is available.
This commit is contained in:
Mark Nauwelaerts 2017-07-19 11:27:32 +02:00
parent 52c017caca
commit 854f85acb4
1 changed files with 41 additions and 22 deletions
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63
gst/isomp4/qtdemux.c
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@ -4816,9 +4816,15 @@ gst_qtdemux_activate_segment (GstQTDemux * qtdemux, QtDemuxStream * stream,
* (FIXME: doesn't seem to work so well with ismv and wmv, as no parser; the
* tfra entries tells us which trun/sample the key unit is in, but we don't
* make use of this additional information at the moment) */
if (qtdemux->fragmented) {
if (qtdemux->fragmented && !qtdemux->fragmented_seek_pending) {
stream->to_sample = G_MAXUINT32;
return TRUE;
} else {
/* well, it will be taken care of below */
qtdemux->fragmented_seek_pending = FALSE;
/* FIXME ideally the do_fragmented_seek can be done right here,
* rather than at loop level
* (which might even allow handling edit lists in a fragmented file) */
}
/* We don't need to look for a sample in push-based */
@ -5604,6 +5610,8 @@ gst_qtdemux_do_fragmented_seek (GstQTDemux * qtdemux)
g_assert (qtdemux->n_streams > 0);
/* first see if we can determine where to go to using mfra,
* before we start clearing things */
for (i = 0; i < qtdemux->n_streams; i++) {
const QtDemuxRandomAccessEntry *entry;
QtDemuxStream *stream;
@ -5611,24 +5619,6 @@ gst_qtdemux_do_fragmented_seek (GstQTDemux * qtdemux)
stream = qtdemux->streams[i];
g_free (stream->samples);
stream->samples = NULL;
stream->n_samples = 0;
stream->stbl_index = -1; /* no samples have yet been parsed */
stream->sample_index = -1;
if (stream->protection_scheme_info) {
/* Clear out any old cenc crypto info entries as we'll move to a new moof */
if (stream->protection_scheme_type == FOURCC_cenc) {
QtDemuxCencSampleSetInfo *info =
(QtDemuxCencSampleSetInfo *) stream->protection_scheme_info;
if (info->crypto_info) {
g_ptr_array_free (info->crypto_info, TRUE);
info->crypto_info = NULL;
}
}
}
if (stream->ra_entries == NULL)
continue;
@ -5654,11 +5644,37 @@ gst_qtdemux_do_fragmented_seek (GstQTDemux * qtdemux)
best_entry = entry;
}
/* no luck, will handle seek otherwise */
if (best_entry == NULL) {
GST_OBJECT_UNLOCK (qtdemux);
return FALSE;
}
/* ok, now we can prepare for processing as of located moof */
for (i = 0; i < qtdemux->n_streams; i++) {
QtDemuxStream *stream;
stream = qtdemux->streams[i];
g_free (stream->samples);
stream->samples = NULL;
stream->n_samples = 0;
stream->stbl_index = -1; /* no samples have yet been parsed */
stream->sample_index = -1;
if (stream->protection_scheme_info) {
/* Clear out any old cenc crypto info entries as we'll move to a new moof */
if (stream->protection_scheme_type == FOURCC_cenc) {
QtDemuxCencSampleSetInfo *info =
(QtDemuxCencSampleSetInfo *) stream->protection_scheme_info;
if (info->crypto_info) {
g_ptr_array_free (info->crypto_info, TRUE);
info->crypto_info = NULL;
}
}
}
}
GST_INFO_OBJECT (qtdemux, "seek to %" GST_TIME_FORMAT ", best fragment "
"moof offset: %" G_GUINT64_FORMAT ", ts %" GST_TIME_FORMAT,
GST_TIME_ARGS (qtdemux->streams[0]->time_position),
@ -5694,9 +5710,12 @@ gst_qtdemux_loop_state_movie (GstQTDemux * qtdemux)
if (qtdemux->fragmented_seek_pending) {
GST_INFO_OBJECT (qtdemux, "pending fragmented seek");
gst_qtdemux_do_fragmented_seek (qtdemux);
GST_INFO_OBJECT (qtdemux, "fragmented seek done!");
qtdemux->fragmented_seek_pending = FALSE;
if (gst_qtdemux_do_fragmented_seek (qtdemux)) {
GST_INFO_OBJECT (qtdemux, "fragmented seek done!");
qtdemux->fragmented_seek_pending = FALSE;
} else {
GST_INFO_OBJECT (qtdemux, "fragmented seek still pending");
}
}
/* Figure out the next stream sample to output, min_time is expressed in