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ttmlparse: Don't add GstMemorys to a GstBuffer that is full

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The parser stores the text from each inline element of a scene in its
own GstMemory, which is inserted in the GstBuffer containing the scene
data. However, GstBuffers can contain only a limited number of
GstMemorys. Therefore, don't add more than the maximum number of
GstMemorys to each buffer, and warn if this is attempted.

https://bugzilla.gnome.org/show_bug.cgi?id=781725
This commit is contained in:
Chris Bass 2017-04-25 15:33:38 +01:00 committed by Sebastian Dröge
parent ef65230b46
commit 22c3830858
1 changed files with 32 additions and 14 deletions
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46
ext/ttml/ttmlparse.c
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@ -1466,13 +1466,16 @@ ttml_split_body_by_region (GNode * body, GHashTable * regions)
}
static guint
static gint
ttml_add_text_to_buffer (GstBuffer * buf, const gchar * text)
{
GstMemory *mem;
GstMapInfo map;
guint ret;
if (gst_buffer_n_memory (buf) == gst_buffer_get_max_memory ())
return -1;
mem = gst_allocator_alloc (NULL, strlen (text) + 1, NULL);
if (!gst_memory_map (mem, &map, GST_MAP_WRITE))
GST_CAT_ERROR (ttmlparse_debug, "Failed to map memory.");
@ -1490,7 +1493,7 @@ ttml_add_text_to_buffer (GstBuffer * buf, const gchar * text)
/* Create a GstSubtitleElement from @element, add it to @block, and insert its
* associated text in @buf. */
static void
static gboolean
ttml_add_element (GstSubtitleBlock * block, TtmlElement * element,
GstBuffer * buf, guint cellres_x, guint cellres_y)
{
@ -1498,20 +1501,27 @@ ttml_add_element (GstSubtitleBlock * block, TtmlElement * element,
guint buffer_index;
GstSubtitleElement *sub_element = NULL;
element_style = gst_subtitle_style_set_new ();
ttml_update_style_set (element_style, element->style_set,
cellres_x, cellres_y);
buffer_index = ttml_add_text_to_buffer (buf, element->text);
if (buffer_index == -1) {
GST_CAT_WARNING (ttmlparse_debug,
"Reached maximum element count for buffer - discarding element.");
return FALSE;
}
GST_CAT_DEBUG (ttmlparse_debug, "Inserted text at index %u in GstBuffer.",
buffer_index);
element_style = gst_subtitle_style_set_new ();
ttml_update_style_set (element_style, element->style_set,
cellres_x, cellres_y);
sub_element = gst_subtitle_element_new (element_style, buffer_index,
(element->whitespace_mode != TTML_WHITESPACE_MODE_PRESERVE));
gst_subtitle_block_add_element (block, sub_element);
GST_CAT_DEBUG (ttmlparse_debug, "Added element to block; there are now %u"
" elements in the block.", gst_subtitle_block_get_element_count (block));
GST_CAT_DEBUG (ttmlparse_debug,
"Added element to block; there are now %u elements in the block.",
gst_subtitle_block_get_element_count (block));
return TRUE;
}
@ -1621,7 +1631,9 @@ ttml_create_subtitle_region (GNode * tree, GstBuffer * buf, guint cellres_x,
if (element->type == TTML_ELEMENT_TYPE_BR
|| element->type == TTML_ELEMENT_TYPE_ANON_SPAN) {
ttml_add_element (block, element, buf, cellres_x, cellres_y);
if (!ttml_add_element (block, element, buf, cellres_x, cellres_y))
GST_CAT_WARNING (ttmlparse_debug,
"Failed to add element to buffer.");
} else if (element->type == TTML_ELEMENT_TYPE_SPAN) {
/* Loop through anon-span children of this span. */
for (anon_node = content_node->children; anon_node;
@ -1630,7 +1642,9 @@ ttml_create_subtitle_region (GNode * tree, GstBuffer * buf, guint cellres_x,
if (element->type == TTML_ELEMENT_TYPE_BR
|| element->type == TTML_ELEMENT_TYPE_ANON_SPAN) {
ttml_add_element (block, element, buf, cellres_x, cellres_y);
if (!ttml_add_element (block, element, buf, cellres_x, cellres_y))
GST_CAT_WARNING (ttmlparse_debug,
"Failed to add element to buffer.");
} else {
ttml_warn_of_mispositioned_element (element);
}
@ -1640,10 +1654,14 @@ ttml_create_subtitle_region (GNode * tree, GstBuffer * buf, guint cellres_x,
}
}
gst_subtitle_region_add_block (region, block);
GST_CAT_DEBUG (ttmlparse_debug,
"Added block to region; there are now %u blocks in the region.",
gst_subtitle_region_get_block_count (region));
if (gst_subtitle_block_get_element_count (block) > 0) {
gst_subtitle_region_add_block (region, block);
GST_CAT_DEBUG (ttmlparse_debug,
"Added block to region; there are now %u blocks in the region.",
gst_subtitle_region_get_block_count (region));
} else {
gst_subtitle_block_unref (block);
}
}
}