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v4l2src: Ensure all caps a fixated

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The code relied on the list compare function to fixate the caps
but if the caps only has one structure, the compare function will
never get called. Capture device for which there is only one
structure in the caps would then get some assertion and later
fail badly.

Instead, fixate before inserting into the list and split the reading
and the fixation of the structures.
This commit is contained in:
Nicolas Dufresne 2017-09-13 16:05:08 -04:00
parent c56eb21a82
commit a08d7cdef5
1 changed files with 28 additions and 24 deletions
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52
sys/v4l2/gstv4l2src.c
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@ -277,46 +277,47 @@ gst_vl42_src_fixate_fields (GQuark field_id, GValue * value, gpointer user_data)
static void
gst_v4l2_src_fixate_struct_with_preference (GstStructure * s,
struct PreferedCapsInfo *pref, gint * width, gint * height,
gint * fps_n, gint * fps_d)
struct PreferedCapsInfo *pref)
{
if (gst_structure_has_field (s, "width")) {
if (gst_structure_has_field (s, "width"))
gst_structure_fixate_field_nearest_int (s, "width", pref->width);
if (width)
gst_structure_get_int (s, "width", width);
}
if (gst_structure_has_field (s, "height")) {
if (gst_structure_has_field (s, "height"))
gst_structure_fixate_field_nearest_int (s, "height", pref->height);
if (height)
gst_structure_get_int (s, "height", height);
}
if (gst_structure_has_field (s, "framerate")) {
if (gst_structure_has_field (s, "framerate"))
gst_structure_fixate_field_nearest_fraction (s, "framerate", pref->fps_n,
pref->fps_d);
if (fps_n && fps_d)
gst_structure_get_fraction (s, "framerate", fps_n, fps_d);
}
/* Finally, fixate everything else except the interlace-mode and colorimetry
* which still need further negotiation as it wasn't probed */
gst_structure_map_in_place (s, gst_vl42_src_fixate_fields, s);
}
static void
gst_v4l2_src_parse_fixed_struct (GstStructure * s,
gint * width, gint * height, gint * fps_n, gint * fps_d)
{
if (gst_structure_has_field (s, "width") && width)
gst_structure_get_int (s, "width", width);
if (gst_structure_has_field (s, "height") && height)
gst_structure_get_int (s, "height", height);
if (gst_structure_has_field (s, "framerate") && fps_n && fps_d)
gst_structure_get_fraction (s, "framerate", fps_n, fps_d);
}
/* TODO Consider framerate */
static gint
gst_v4l2src_caps_fixate_and_compare (GstStructure * a, GstStructure * b,
gst_v4l2src_fixed_caps_compare (GstStructure * a, GstStructure * b,
struct PreferedCapsInfo *pref)
{
gint aw = G_MAXINT, ah = G_MAXINT, ad = G_MAXINT;
gint bw = G_MAXINT, bh = G_MAXINT, bd = G_MAXINT;
gst_v4l2_src_fixate_struct_with_preference (a, pref, &aw, &ah, NULL, NULL);
gst_v4l2_src_fixate_struct_with_preference (b, pref, &bw, &bh, NULL, NULL);
gst_v4l2_src_parse_fixed_struct (a, &aw, &ah, NULL, NULL);
gst_v4l2_src_parse_fixed_struct (b, &bw, &bh, NULL, NULL);
/* When both are smaller then pref, just append to the end */
if ((bw < pref->width || bh < pref->height)
@ -380,16 +381,19 @@ gst_v4l2src_fixate (GstBaseSrc * basesrc, GstCaps * caps, GstStructure * pref_s)
* transformation to happen downstream. */
if (pref_s) {
pref_s = gst_structure_copy (pref_s);
gst_v4l2_src_fixate_struct_with_preference (pref_s, &pref, &pref.width,
&pref.height, &pref.fps_n, &pref.fps_d);
gst_v4l2_src_fixate_struct_with_preference (pref_s, &pref);
gst_v4l2_src_parse_fixed_struct (pref_s, &pref.width, &pref.height,
&pref.fps_n, &pref.fps_d);
gst_structure_free (pref_s);
}
/* Sort the structures to get the caps that is nearest to our preferences,
* first */
while ((s = gst_caps_steal_structure (caps, 0)))
while ((s = gst_caps_steal_structure (caps, 0))) {
gst_v4l2_src_fixate_struct_with_preference (s, &pref);
caps_list = g_list_insert_sorted_with_data (caps_list, s,
(GCompareDataFunc) gst_v4l2src_caps_fixate_and_compare, &pref);
(GCompareDataFunc) gst_v4l2src_fixed_caps_compare, &pref);
}
while (caps_list) {
s = caps_list->data;