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matroskademux: Allow Matroska headers to be read more than once

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This is necessary for MSE, where a new MSE initialization segment may be
appended at any point. These MSE initialization segments consist of an
entire WebM file until the first Cluster element (not included). [1]

Note that track definitions are ignored on successive headers, they must
match, but this is not checked by matroskademux (look for
`(!demux->tracks_parsed)` in the code).

Source pads are not altered when the new headers are read.

This patch has been splitted from the original patch from eocanha in [2].

[1] https://www.w3.org/TR/mse-byte-stream-format-webm/
[2] https://bug334082.bugzilla-attachments.gnome.org/attachment.cgi?id=362212

https://bugzilla.gnome.org/show_bug.cgi?id=793333
This commit is contained in:
Alicia Boya García 2017-11-30 20:44:23 +01:00 committed by Thibault Saunier
parent 9605028a71
commit 9dc7859184
1 changed files with 5 additions and 0 deletions
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5
gst/matroska/matroska-demux.c
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@ -4984,6 +4984,11 @@ gst_matroska_demux_parse_id (GstMatroskaDemux * demux, guint32 id,
case GST_MATROSKA_READ_STATE_DATA: case GST_MATROSKA_READ_STATE_DATA:
case GST_MATROSKA_READ_STATE_SEEK: case GST_MATROSKA_READ_STATE_SEEK:
switch (id) { switch (id) {
case GST_EBML_ID_HEADER:
GST_READ_CHECK (gst_matroska_demux_flush (demux, read));
demux->common.state = GST_MATROSKA_READ_STATE_SEGMENT;
gst_matroska_demux_check_seekability (demux);
break;
case GST_MATROSKA_ID_SEGMENTINFO: case GST_MATROSKA_ID_SEGMENTINFO:
if (!demux->common.segmentinfo_parsed) { if (!demux->common.segmentinfo_parsed) {
GST_READ_CHECK (gst_matroska_demux_take (demux, read, &ebml)); GST_READ_CHECK (gst_matroska_demux_take (demux, read, &ebml));