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tagdemux: resize and trim buffer in place to fix interaction with oggdemux

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Elements operating in pull mode may optionally pass a buffer to
pull_range that should be filled with the data. The only element
that does that at the moment is oggdemux operating in pull mode.

tagdemux currently creates a sub-buffer whenever a buffer pulled
from upstream (filesrc, usually) needs to be trimmed. This creates
a new buffer, however, so disregards any passed-in buffer from a
downstream oggdemux.

This would cause assertion failures and playback problems for
ogg files that contain ID3 tags at the end.

Fixes https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/issues/848

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/994>
This commit is contained in:
Tim-Philipp Müller 2021-01-04 13:40:20 +00:00
parent 06c158957d
commit 89bd37f24e
1 changed files with 23 additions and 9 deletions
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32
gst-libs/gst/tag/gsttagdemux.c
View file

@ -377,7 +377,8 @@ gst_tag_demux_trim_buffer (GstTagDemux * tagdemux, GstBuffer ** buf_ref,
guint trim_start = 0;
guint out_size, bsize;
guint64 out_offset, boffset;
gboolean need_sub = FALSE;
gboolean need_fixup = FALSE;
gboolean is_writable;
bsize = out_size = gst_buffer_get_size (buf);
boffset = out_offset = GST_BUFFER_OFFSET (buf);
@ -402,7 +403,7 @@ gst_tag_demux_trim_buffer (GstTagDemux * tagdemux, GstBuffer ** buf_ref,
if (out_offset + out_size > v1tag_offset) {
out_size = v1tag_offset - out_offset;
need_sub = TRUE;
need_fixup = TRUE;
}
}
}
@ -421,11 +422,16 @@ gst_tag_demux_trim_buffer (GstTagDemux * tagdemux, GstBuffer ** buf_ref,
} else {
out_offset -= tagdemux->priv->strip_start;
}
need_sub = TRUE;
need_fixup = TRUE;
}
if (need_sub) {
if (out_size != bsize || !gst_buffer_is_writable (buf)) {
if (!need_fixup)
goto done;
is_writable = gst_buffer_is_writable (buf);
if (out_size != bsize || !is_writable) {
if (!is_writable) {
GstBuffer *sub;
GST_DEBUG_OBJECT (tagdemux, "Sub-buffering to trim size %d offset %"
@ -444,15 +450,23 @@ gst_tag_demux_trim_buffer (GstTagDemux * tagdemux, GstBuffer ** buf_ref,
*buf_ref = buf = sub;
*buf_size = out_size;
} else {
GST_DEBUG_OBJECT (tagdemux, "Adjusting buffer from size %d offset %"
GST_DEBUG_OBJECT (tagdemux, "Resizing buffer to trim size %d offset %"
G_GINT64_FORMAT " to %d offset %" G_GINT64_FORMAT,
bsize, boffset, out_size, out_offset);
}
GST_BUFFER_OFFSET (buf) = out_offset;
GST_BUFFER_OFFSET_END (buf) = out_offset + out_size;
gst_buffer_resize (buf, trim_start, out_size);
}
} else {
GST_DEBUG_OBJECT (tagdemux, "Adjusting buffer from size %d offset %"
G_GINT64_FORMAT " to %d offset %" G_GINT64_FORMAT,
bsize, boffset, out_size, out_offset);
}
GST_BUFFER_OFFSET (buf) = out_offset;
GST_BUFFER_OFFSET_END (buf) = out_offset + out_size;
done:
return TRUE;
no_out_buffer_end: