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interlace: fix negotiation with fixed framerate downstream
https://bugzilla.gnome.org/show_bug.cgi?id=762924
This commit is contained in:
Vincent Penquerc'h
Sebastian Dröge
parent
10bc9a7efc
commit
5b786ce5b7
1 changed files with 154 additions and 0 deletions
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@ -495,6 +495,154 @@ gst_interlace_sink_event (GstPad * pad, GstObject * parent, GstEvent * event)
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return ret;
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}
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static gboolean
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gst_interlace_fraction_double (gint * n_out, gint * d_out, gboolean half)
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{
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gint n, d, gcd;
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n = *n_out;
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d = *d_out;
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if (d == 0)
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return FALSE;
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if (n == 0)
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return TRUE;
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gcd = gst_util_greatest_common_divisor (n, d);
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n /= gcd;
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d /= gcd;
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if (half) {
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if (G_MAXINT / 2 >= ABS (d)) {
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d *= 2;
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} else if (n >= 2 && n != G_MAXINT) {
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n /= 2;
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} else {
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d = G_MAXINT;
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}
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} else {
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if (G_MAXINT / 2 >= ABS (n)) {
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n *= 2;
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} else if (d >= 2 && d != G_MAXINT) {
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d /= 2;
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} else {
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n = G_MAXINT;
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}
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}
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*n_out = n;
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*d_out = d;
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return TRUE;
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}
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static GstCaps *
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gst_interlace_caps_double_framerate (GstCaps * caps, gboolean half)
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{
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guint len;
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for (len = gst_caps_get_size (caps); len > 0; len--) {
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GstStructure *s = gst_caps_get_structure (caps, len - 1);
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const GValue *val;
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val = gst_structure_get_value (s, "framerate");
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if (!val)
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continue;
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if (G_VALUE_TYPE (val) == GST_TYPE_FRACTION) {
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gint n, d;
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n = gst_value_get_fraction_numerator (val);
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d = gst_value_get_fraction_denominator (val);
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if (!gst_interlace_fraction_double (&n, &d, half)) {
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gst_caps_remove_structure (caps, len - 1);
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continue;
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}
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gst_structure_set (s, "framerate", GST_TYPE_FRACTION, n, d, NULL);
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} else if (G_VALUE_TYPE (val) == GST_TYPE_FRACTION_RANGE) {
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const GValue *min, *max;
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GValue nrange = { 0, }, nmin = {
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0,}, nmax = {
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0,};
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gint n, d;
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g_value_init (&nrange, GST_TYPE_FRACTION_RANGE);
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g_value_init (&nmin, GST_TYPE_FRACTION);
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g_value_init (&nmax, GST_TYPE_FRACTION);
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min = gst_value_get_fraction_range_min (val);
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max = gst_value_get_fraction_range_max (val);
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n = gst_value_get_fraction_numerator (min);
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d = gst_value_get_fraction_denominator (min);
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if (!gst_interlace_fraction_double (&n, &d, half)) {
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g_value_unset (&nrange);
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g_value_unset (&nmax);
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g_value_unset (&nmin);
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gst_caps_remove_structure (caps, len - 1);
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continue;
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}
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gst_value_set_fraction (&nmin, n, d);
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n = gst_value_get_fraction_numerator (max);
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d = gst_value_get_fraction_denominator (max);
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if (!gst_interlace_fraction_double (&n, &d, half)) {
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g_value_unset (&nrange);
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g_value_unset (&nmax);
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g_value_unset (&nmin);
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gst_caps_remove_structure (caps, len - 1);
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continue;
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}
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gst_value_set_fraction (&nmax, n, d);
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gst_value_set_fraction_range (&nrange, &nmin, &nmax);
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gst_structure_take_value (s, "framerate", &nrange);
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g_value_unset (&nmin);
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g_value_unset (&nmax);
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} else if (G_VALUE_TYPE (val) == GST_TYPE_LIST) {
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const GValue *lval;
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GValue nlist = { 0, };
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GValue nval = { 0, };
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gint i;
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g_value_init (&nlist, GST_TYPE_LIST);
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for (i = gst_value_list_get_size (val); i > 0; i--) {
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gint n, d;
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lval = gst_value_list_get_value (val, i - 1);
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if (G_VALUE_TYPE (lval) != GST_TYPE_FRACTION)
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continue;
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n = gst_value_get_fraction_numerator (lval);
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d = gst_value_get_fraction_denominator (lval);
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/* Double/Half the framerate but if this fails simply
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* skip this value from the list */
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if (!gst_interlace_fraction_double (&n, &d, half)) {
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continue;
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}
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g_value_init (&nval, GST_TYPE_FRACTION);
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gst_value_set_fraction (&nval, n, d);
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gst_value_list_append_and_take_value (&nlist, &nval);
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}
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gst_structure_take_value (s, "framerate", &nlist);
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}
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}
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return caps;
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}
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static GstCaps *
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gst_interlace_getcaps (GstPad * pad, GstInterlace * interlace, GstCaps * filter)
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{
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@ -510,6 +658,9 @@ gst_interlace_getcaps (GstPad * pad, GstInterlace * interlace, GstCaps * filter)
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if (filter != NULL) {
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clean_filter = gst_caps_copy (filter);
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clean_filter =
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gst_interlace_caps_double_framerate (clean_filter,
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(pad == interlace->sinkpad));
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for (i = 0; i < gst_caps_get_size (clean_filter); ++i) {
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GstStructure *s;
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@ -543,6 +694,9 @@ gst_interlace_getcaps (GstPad * pad, GstInterlace * interlace, GstCaps * filter)
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gst_caps_set_simple (icaps, "interlace-mode", G_TYPE_STRING,
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pad == interlace->srcpad ? mode : "progressive", NULL);
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icaps =
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gst_interlace_caps_double_framerate (icaps, (pad == interlace->srcpad));
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if (clean_filter)
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gst_caps_unref (clean_filter);
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