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v4l2: Allow scaling in the v4l2*convert element
This is inspired of videoscale and videoconvert elements. https://bugzilla.gnome.org/show_bug.cgi?id=742917
This commit is contained in:
Enrico Jorns
Nicolas Dufresne
parent
0a578c235a
commit
3067a60d8e
1 changed files with 424 additions and 11 deletions
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@ -375,7 +375,7 @@ gst_v4l2_transform_caps_remove_format_info (GstCaps * caps)
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&& gst_caps_features_is_equal (f,
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GST_CAPS_FEATURES_MEMORY_SYSTEM_MEMORY))
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gst_structure_remove_fields (st, "format", "colorimetry", "chroma-site",
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NULL);
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"width", "height", NULL);
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gst_caps_append_structure_full (res, st, gst_caps_features_copy (f));
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}
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@ -414,24 +414,437 @@ static GstCaps *
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gst_v4l2_transform_fixate_caps (GstBaseTransform * trans,
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GstPadDirection direction, GstCaps * caps, GstCaps * othercaps)
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{
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GstCaps *result;
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GstStructure *ins, *outs;
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const GValue *from_par, *to_par;
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GValue fpar = { 0, }, tpar = {
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0,};
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othercaps = gst_caps_truncate (othercaps);
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othercaps = gst_caps_make_writable (othercaps);
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GST_DEBUG_OBJECT (trans, "trying to fixate othercaps %" GST_PTR_FORMAT
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" based on caps %" GST_PTR_FORMAT, othercaps, caps);
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result = gst_caps_intersect (othercaps, caps);
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if (gst_caps_is_empty (result)) {
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gst_caps_unref (result);
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result = othercaps;
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ins = gst_caps_get_structure (caps, 0);
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outs = gst_caps_get_structure (othercaps, 0);
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from_par = gst_structure_get_value (ins, "pixel-aspect-ratio");
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to_par = gst_structure_get_value (outs, "pixel-aspect-ratio");
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/* If we're fixating from the sinkpad we always set the PAR and
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* assume that missing PAR on the sinkpad means 1/1 and
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* missing PAR on the srcpad means undefined
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*/
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if (direction == GST_PAD_SINK) {
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if (!from_par) {
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g_value_init (&fpar, GST_TYPE_FRACTION);
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gst_value_set_fraction (&fpar, 1, 1);
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from_par = &fpar;
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}
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if (!to_par) {
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g_value_init (&tpar, GST_TYPE_FRACTION_RANGE);
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gst_value_set_fraction_range_full (&tpar, 1, G_MAXINT, G_MAXINT, 1);
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to_par = &tpar;
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}
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} else {
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gst_caps_unref (othercaps);
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if (!to_par) {
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g_value_init (&tpar, GST_TYPE_FRACTION);
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gst_value_set_fraction (&tpar, 1, 1);
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to_par = &tpar;
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gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1,
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NULL);
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}
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if (!from_par) {
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g_value_init (&fpar, GST_TYPE_FRACTION);
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gst_value_set_fraction (&fpar, 1, 1);
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from_par = &fpar;
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}
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}
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GST_DEBUG_OBJECT (trans, "now fixating %" GST_PTR_FORMAT, result);
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/* we have both PAR but they might not be fixated */
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{
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gint from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d;
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gint w = 0, h = 0;
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gint from_dar_n, from_dar_d;
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gint num, den;
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result = gst_caps_fixate (result);
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/* from_par should be fixed */
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g_return_val_if_fail (gst_value_is_fixed (from_par), othercaps);
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return result;
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from_par_n = gst_value_get_fraction_numerator (from_par);
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from_par_d = gst_value_get_fraction_denominator (from_par);
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gst_structure_get_int (ins, "width", &from_w);
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gst_structure_get_int (ins, "height", &from_h);
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gst_structure_get_int (outs, "width", &w);
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gst_structure_get_int (outs, "height", &h);
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/* if both width and height are already fixed, we can't do anything
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* about it anymore */
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if (w && h) {
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guint n, d;
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GST_DEBUG_OBJECT (trans, "dimensions already set to %dx%d, not fixating",
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w, h);
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if (!gst_value_is_fixed (to_par)) {
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if (gst_video_calculate_display_ratio (&n, &d, from_w, from_h,
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from_par_n, from_par_d, w, h)) {
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GST_DEBUG_OBJECT (trans, "fixating to_par to %dx%d", n, d);
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if (gst_structure_has_field (outs, "pixel-aspect-ratio"))
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gst_structure_fixate_field_nearest_fraction (outs,
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"pixel-aspect-ratio", n, d);
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else if (n != d)
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gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
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n, d, NULL);
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}
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}
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goto done;
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}
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/* Calculate input DAR */
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if (!gst_util_fraction_multiply (from_w, from_h, from_par_n, from_par_d,
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&from_dar_n, &from_dar_d)) {
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GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
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("Error calculating the output scaled size - integer overflow"));
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goto done;
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}
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GST_DEBUG_OBJECT (trans, "Input DAR is %d/%d", from_dar_n, from_dar_d);
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/* If either width or height are fixed there's not much we
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* can do either except choosing a height or width and PAR
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* that matches the DAR as good as possible
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*/
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if (h) {
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GstStructure *tmp;
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gint set_w, set_par_n, set_par_d;
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GST_DEBUG_OBJECT (trans, "height is fixed (%d)", h);
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/* If the PAR is fixed too, there's not much to do
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* except choosing the width that is nearest to the
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* width with the same DAR */
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if (gst_value_is_fixed (to_par)) {
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to_par_n = gst_value_get_fraction_numerator (to_par);
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to_par_d = gst_value_get_fraction_denominator (to_par);
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GST_DEBUG_OBJECT (trans, "PAR is fixed %d/%d", to_par_n, to_par_d);
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if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_d,
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to_par_n, &num, &den)) {
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GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
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("Error calculating the output scaled size - integer overflow"));
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goto done;
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}
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w = (guint) gst_util_uint64_scale_int (h, num, den);
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gst_structure_fixate_field_nearest_int (outs, "width", w);
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goto done;
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}
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/* The PAR is not fixed and it's quite likely that we can set
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* an arbitrary PAR. */
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/* Check if we can keep the input width */
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tmp = gst_structure_copy (outs);
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gst_structure_fixate_field_nearest_int (tmp, "width", from_w);
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gst_structure_get_int (tmp, "width", &set_w);
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/* Might have failed but try to keep the DAR nonetheless by
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* adjusting the PAR */
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if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, h, set_w,
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&to_par_n, &to_par_d)) {
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GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
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("Error calculating the output scaled size - integer overflow"));
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gst_structure_free (tmp);
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goto done;
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}
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if (!gst_structure_has_field (tmp, "pixel-aspect-ratio"))
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gst_structure_set_value (tmp, "pixel-aspect-ratio", to_par);
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gst_structure_fixate_field_nearest_fraction (tmp, "pixel-aspect-ratio",
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to_par_n, to_par_d);
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gst_structure_get_fraction (tmp, "pixel-aspect-ratio", &set_par_n,
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&set_par_d);
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gst_structure_free (tmp);
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/* Check if the adjusted PAR is accepted */
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if (set_par_n == to_par_n && set_par_d == to_par_d) {
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if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
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set_par_n != set_par_d)
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gst_structure_set (outs, "width", G_TYPE_INT, set_w,
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"pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d,
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NULL);
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goto done;
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}
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/* Otherwise scale the width to the new PAR and check if the
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* adjusted with is accepted. If all that fails we can't keep
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* the DAR */
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if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_par_d,
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set_par_n, &num, &den)) {
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GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
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("Error calculating the output scaled size - integer overflow"));
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goto done;
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}
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w = (guint) gst_util_uint64_scale_int (h, num, den);
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gst_structure_fixate_field_nearest_int (outs, "width", w);
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if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
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set_par_n != set_par_d)
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gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
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set_par_n, set_par_d, NULL);
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goto done;
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} else if (w) {
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GstStructure *tmp;
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gint set_h, set_par_n, set_par_d;
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GST_DEBUG_OBJECT (trans, "width is fixed (%d)", w);
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/* If the PAR is fixed too, there's not much to do
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* except choosing the height that is nearest to the
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* height with the same DAR */
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if (gst_value_is_fixed (to_par)) {
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to_par_n = gst_value_get_fraction_numerator (to_par);
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to_par_d = gst_value_get_fraction_denominator (to_par);
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GST_DEBUG_OBJECT (trans, "PAR is fixed %d/%d", to_par_n, to_par_d);
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if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_d,
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to_par_n, &num, &den)) {
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GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
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("Error calculating the output scaled size - integer overflow"));
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goto done;
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}
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h = (guint) gst_util_uint64_scale_int (w, den, num);
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gst_structure_fixate_field_nearest_int (outs, "height", h);
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goto done;
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}
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/* The PAR is not fixed and it's quite likely that we can set
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* an arbitrary PAR. */
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/* Check if we can keep the input height */
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tmp = gst_structure_copy (outs);
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gst_structure_fixate_field_nearest_int (tmp, "height", from_h);
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gst_structure_get_int (tmp, "height", &set_h);
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/* Might have failed but try to keep the DAR nonetheless by
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* adjusting the PAR */
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if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_h, w,
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&to_par_n, &to_par_d)) {
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GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
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("Error calculating the output scaled size - integer overflow"));
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gst_structure_free (tmp);
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goto done;
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}
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if (!gst_structure_has_field (tmp, "pixel-aspect-ratio"))
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gst_structure_set_value (tmp, "pixel-aspect-ratio", to_par);
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gst_structure_fixate_field_nearest_fraction (tmp, "pixel-aspect-ratio",
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to_par_n, to_par_d);
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gst_structure_get_fraction (tmp, "pixel-aspect-ratio", &set_par_n,
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&set_par_d);
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gst_structure_free (tmp);
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/* Check if the adjusted PAR is accepted */
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if (set_par_n == to_par_n && set_par_d == to_par_d) {
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if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
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set_par_n != set_par_d)
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gst_structure_set (outs, "height", G_TYPE_INT, set_h,
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"pixel-aspect-ratio", GST_TYPE_FRACTION, set_par_n, set_par_d,
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NULL);
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goto done;
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}
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/* Otherwise scale the height to the new PAR and check if the
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* adjusted with is accepted. If all that fails we can't keep
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* the DAR */
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if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_par_d,
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set_par_n, &num, &den)) {
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GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
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("Error calculating the output scaled size - integer overflow"));
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goto done;
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}
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h = (guint) gst_util_uint64_scale_int (w, den, num);
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gst_structure_fixate_field_nearest_int (outs, "height", h);
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if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
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set_par_n != set_par_d)
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gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
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set_par_n, set_par_d, NULL);
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goto done;
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} else if (gst_value_is_fixed (to_par)) {
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GstStructure *tmp;
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gint set_h, set_w, f_h, f_w;
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to_par_n = gst_value_get_fraction_numerator (to_par);
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to_par_d = gst_value_get_fraction_denominator (to_par);
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/* Calculate scale factor for the PAR change */
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if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, to_par_n,
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to_par_d, &num, &den)) {
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GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
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("Error calculating the output scaled size - integer overflow"));
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goto done;
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}
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/* Try to keep the input height (because of interlacing) */
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tmp = gst_structure_copy (outs);
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gst_structure_fixate_field_nearest_int (tmp, "height", from_h);
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gst_structure_get_int (tmp, "height", &set_h);
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/* This might have failed but try to scale the width
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* to keep the DAR nonetheless */
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w = (guint) gst_util_uint64_scale_int (set_h, num, den);
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gst_structure_fixate_field_nearest_int (tmp, "width", w);
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gst_structure_get_int (tmp, "width", &set_w);
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gst_structure_free (tmp);
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/* We kept the DAR and the height is nearest to the original height */
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if (set_w == w) {
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gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
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G_TYPE_INT, set_h, NULL);
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goto done;
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}
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f_h = set_h;
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f_w = set_w;
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/* If the former failed, try to keep the input width at least */
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tmp = gst_structure_copy (outs);
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gst_structure_fixate_field_nearest_int (tmp, "width", from_w);
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gst_structure_get_int (tmp, "width", &set_w);
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/* This might have failed but try to scale the width
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* to keep the DAR nonetheless */
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h = (guint) gst_util_uint64_scale_int (set_w, den, num);
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gst_structure_fixate_field_nearest_int (tmp, "height", h);
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gst_structure_get_int (tmp, "height", &set_h);
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gst_structure_free (tmp);
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/* We kept the DAR and the width is nearest to the original width */
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if (set_h == h) {
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gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
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G_TYPE_INT, set_h, NULL);
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goto done;
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}
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/* If all this failed, keep the height that was nearest to the orignal
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* height and the nearest possible width. This changes the DAR but
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* there's not much else to do here.
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*/
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gst_structure_set (outs, "width", G_TYPE_INT, f_w, "height", G_TYPE_INT,
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f_h, NULL);
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goto done;
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} else {
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GstStructure *tmp;
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gint set_h, set_w, set_par_n, set_par_d, tmp2;
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/* width, height and PAR are not fixed but passthrough is not possible */
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/* First try to keep the height and width as good as possible
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* and scale PAR */
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tmp = gst_structure_copy (outs);
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gst_structure_fixate_field_nearest_int (tmp, "height", from_h);
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gst_structure_get_int (tmp, "height", &set_h);
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gst_structure_fixate_field_nearest_int (tmp, "width", from_w);
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gst_structure_get_int (tmp, "width", &set_w);
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if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_h, set_w,
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&to_par_n, &to_par_d)) {
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GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
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("Error calculating the output scaled size - integer overflow"));
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goto done;
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}
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if (!gst_structure_has_field (tmp, "pixel-aspect-ratio"))
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gst_structure_set_value (tmp, "pixel-aspect-ratio", to_par);
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gst_structure_fixate_field_nearest_fraction (tmp, "pixel-aspect-ratio",
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to_par_n, to_par_d);
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gst_structure_get_fraction (tmp, "pixel-aspect-ratio", &set_par_n,
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&set_par_d);
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gst_structure_free (tmp);
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if (set_par_n == to_par_n && set_par_d == to_par_d) {
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gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
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G_TYPE_INT, set_h, NULL);
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if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
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set_par_n != set_par_d)
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gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
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set_par_n, set_par_d, NULL);
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goto done;
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}
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/* Otherwise try to scale width to keep the DAR with the set
|
||||
* PAR and height */
|
||||
if (!gst_util_fraction_multiply (from_dar_n, from_dar_d, set_par_d,
|
||||
set_par_n, &num, &den)) {
|
||||
GST_ELEMENT_ERROR (trans, CORE, NEGOTIATION, (NULL),
|
||||
("Error calculating the output scaled size - integer overflow"));
|
||||
goto done;
|
||||
}
|
||||
|
||||
w = (guint) gst_util_uint64_scale_int (set_h, num, den);
|
||||
tmp = gst_structure_copy (outs);
|
||||
gst_structure_fixate_field_nearest_int (tmp, "width", w);
|
||||
gst_structure_get_int (tmp, "width", &tmp2);
|
||||
gst_structure_free (tmp);
|
||||
|
||||
if (tmp2 == w) {
|
||||
gst_structure_set (outs, "width", G_TYPE_INT, tmp2, "height",
|
||||
G_TYPE_INT, set_h, NULL);
|
||||
if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
|
||||
set_par_n != set_par_d)
|
||||
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
|
||||
set_par_n, set_par_d, NULL);
|
||||
goto done;
|
||||
}
|
||||
|
||||
/* ... or try the same with the height */
|
||||
h = (guint) gst_util_uint64_scale_int (set_w, den, num);
|
||||
tmp = gst_structure_copy (outs);
|
||||
gst_structure_fixate_field_nearest_int (tmp, "height", h);
|
||||
gst_structure_get_int (tmp, "height", &tmp2);
|
||||
gst_structure_free (tmp);
|
||||
|
||||
if (tmp2 == h) {
|
||||
gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
|
||||
G_TYPE_INT, tmp2, NULL);
|
||||
if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
|
||||
set_par_n != set_par_d)
|
||||
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
|
||||
set_par_n, set_par_d, NULL);
|
||||
goto done;
|
||||
}
|
||||
|
||||
/* If all fails we can't keep the DAR and take the nearest values
|
||||
* for everything from the first try */
|
||||
gst_structure_set (outs, "width", G_TYPE_INT, set_w, "height",
|
||||
G_TYPE_INT, set_h, NULL);
|
||||
if (gst_structure_has_field (outs, "pixel-aspect-ratio") ||
|
||||
set_par_n != set_par_d)
|
||||
gst_structure_set (outs, "pixel-aspect-ratio", GST_TYPE_FRACTION,
|
||||
set_par_n, set_par_d, NULL);
|
||||
}
|
||||
}
|
||||
|
||||
done:
|
||||
GST_DEBUG_OBJECT (trans, "fixated othercaps to %" GST_PTR_FORMAT, othercaps);
|
||||
|
||||
if (from_par == &fpar)
|
||||
g_value_unset (&fpar);
|
||||
if (to_par == &tpar)
|
||||
g_value_unset (&tpar);
|
||||
|
||||
return othercaps;
|
||||
}
|
||||
|
||||
static GstFlowReturn
|
||||
|
|
@ -654,7 +1067,7 @@ gst_v4l2_transform_class_init (GstV4l2TransformClass * klass)
|
|||
|
||||
gst_element_class_set_static_metadata (element_class,
|
||||
"V4L2 Video Converter",
|
||||
"Filter/Converter/Video",
|
||||
"Filter/Converter/Video/Scaler",
|
||||
"Transform streams via V4L2 API",
|
||||
"Nicolas Dufresne <nicolas.dufresne@collabora.com>");
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue