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gst/videoscale/gstvideoscale.c: Fix negotiation.
Original commit message from CVS: * gst/videoscale/gstvideoscale.c: (gst_videoscale_link): Fix negotiation.
This commit is contained in:
Ronald S. Bultje
parent
0ca877ffe8
commit
2dd175a86a
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@ -1,3 +1,8 @@
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2004-10-01 Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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* gst/videoscale/gstvideoscale.c: (gst_videoscale_link):
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Fix negotiation.
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2004-10-01 Francis Labonte <francis_labonte@hotmail.com>
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Reviewed by: Ronald S. Bultje <rbultje@ronald.bitfreak.net>
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@ -212,13 +212,11 @@ gst_videoscale_link (GstPad * pad, const GstCaps * caps)
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GstVideoscale *videoscale;
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GstPadLinkReturn ret;
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GstPad *otherpad;
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GstCaps *othercaps;
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GstStructure *otherstructure;
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GstStructure *structure;
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GstCaps *othercaps, *newcaps;
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GstStructure *otherstructure, *structure, *newstructure;
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struct videoscale_format_struct *format;
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int height = 0, width = 0;
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const GValue *par = NULL;
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const GValue *otherpar;
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int height = 0, width = 0, newwidth, newheight;
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const GValue *par = NULL, *otherpar;
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GST_DEBUG_OBJECT (pad, "_link with caps %" GST_PTR_FORMAT, caps);
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videoscale = GST_VIDEOSCALE (gst_pad_get_parent (pad));
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@ -241,15 +239,13 @@ gst_videoscale_link (GstPad * pad, const GstCaps * caps)
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caps, GST_DEBUG_PAD_NAME (otherpad));
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ret = gst_pad_try_set_caps (otherpad, caps);
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if (ret == GST_PAD_LINK_OK) {
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if (GST_PAD_LINK_SUCCESSFUL (ret)) {
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/* cool, we can use passthru */
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GST_DEBUG_OBJECT (videoscale, "passthru works");
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videoscale->format = format;
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videoscale->to_width = width;
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videoscale->to_height = height;
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videoscale->from_width = width;
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videoscale->from_height = height;
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videoscale->passthru = TRUE;
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newwidth = width;
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newheight = height;
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goto beach;
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}
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@ -257,132 +253,96 @@ gst_videoscale_link (GstPad * pad, const GstCaps * caps)
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/* no passthru, so try to convert */
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GST_DEBUG_OBJECT (videoscale, "no passthru");
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if (gst_pad_is_negotiated (otherpad)) {
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GstCaps *newcaps = gst_caps_copy (caps);
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/* copy caps to find which one works for the otherpad */
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newcaps = gst_caps_copy (caps);
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newstructure = gst_caps_get_structure (newcaps, 0);
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GST_DEBUG_OBJECT (videoscale, "otherpad %s:%s is negotiated",
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GST_DEBUG_PAD_NAME (otherpad));
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/* iterate over other pad's caps, find a nice conversion.
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* For calculations, we only use the first because we
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* (falsely) assume that all caps have the same PAR and
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* size values. */
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othercaps = gst_pad_get_allowed_caps (otherpad);
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otherstructure = gst_caps_get_structure (othercaps, 0);
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otherpar = gst_structure_get_value (otherstructure, "pixel-aspect-ratio");
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if (par && otherpar) {
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gint num = gst_value_get_fraction_numerator (par),
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den = gst_value_get_fraction_denominator (par),
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onum = gst_value_get_fraction_numerator (otherpar),
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oden = gst_value_get_fraction_denominator (otherpar);
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gboolean keep_h,
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w_align = (width * num * oden % (den * onum) == 0),
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h_align = (height * den * onum % (num * oden) == 0),
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w_inc = (num * oden > den * onum);
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if (pad == videoscale->srcpad) {
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gst_caps_set_simple (newcaps,
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"width", G_TYPE_INT, videoscale->from_width,
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"height", G_TYPE_INT, videoscale->from_height, NULL);
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if (videoscale->from_par) {
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GST_DEBUG_OBJECT (videoscale, "from par %d/%d",
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gst_value_get_fraction_numerator (videoscale->from_par),
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gst_value_get_fraction_denominator (videoscale->from_par));
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gst_structure_set (gst_caps_get_structure (newcaps, 0),
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"pixel-aspect-ratio", GST_TYPE_FRACTION,
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gst_value_get_fraction_numerator (videoscale->from_par),
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gst_value_get_fraction_denominator (videoscale->from_par), NULL);
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}
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/* decide whether to change width or height */
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if (w_align && w_inc)
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keep_h = TRUE;
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else if (h_align && !w_inc)
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keep_h = FALSE;
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else if (w_align)
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keep_h = TRUE;
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else if (h_align)
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keep_h = FALSE;
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else
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keep_h = w_inc;
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/* take par into effect */
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if (keep_h) {
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newwidth = width * num / den;
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newheight = height;
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} else {
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GST_DEBUG_OBJECT (videoscale, "negotiating, checking PAR's");
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/* sink pad is being negotiated, so if there is a PAR,
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* convert w/h/PAR to new src
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* values and try to set them */
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if (par && videoscale->to_par) {
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GValue to_ratio = { 0, };
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gint from_par_n, from_par_d;
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gint to_par_n, to_par_d;
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gint num, den;
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GST_DEBUG_OBJECT (videoscale, "both pads have PAR, calculating");
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from_par_n = gst_value_get_fraction_numerator (par);
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from_par_d = gst_value_get_fraction_denominator (par);
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to_par_n = gst_value_get_fraction_numerator (videoscale->to_par);
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to_par_d = gst_value_get_fraction_denominator (videoscale->to_par);
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g_value_init (&to_ratio, GST_TYPE_FRACTION);
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gst_value_set_fraction (&to_ratio,
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width * from_par_n * to_par_d, height * from_par_d * to_par_n);
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num = gst_value_get_fraction_numerator (&to_ratio);
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den = gst_value_get_fraction_denominator (&to_ratio);
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GST_DEBUG_OBJECT (videoscale, "need to scale to a ratio of %d/%d",
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num, den);
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if (height % den == 0) {
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GST_DEBUG_OBJECT (videoscale, "keeping height %d constant", height);
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videoscale->to_width = height * num / den;
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videoscale->to_height = height;
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} else if (width % num == 0) {
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GST_DEBUG_OBJECT (videoscale, "keeping width %d constant", height);
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videoscale->to_width = width;
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videoscale->to_height = width * den / num;
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} else {
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/* approximate keeping height constant */
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GST_DEBUG_OBJECT (videoscale,
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"approximating while keeping height %d constant", height);
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videoscale->to_width = height * num / den;
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videoscale->to_height = height;
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}
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}
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GST_DEBUG_OBJECT (videoscale, "scaling to %dx%d", videoscale->to_width,
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videoscale->to_height);
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gst_caps_set_simple (newcaps,
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"width", G_TYPE_INT, videoscale->to_width,
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"height", G_TYPE_INT, videoscale->to_height, NULL);
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if (videoscale->to_par) {
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GST_DEBUG_OBJECT (videoscale, "to par %d/%d",
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gst_value_get_fraction_numerator (videoscale->to_par),
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gst_value_get_fraction_denominator (videoscale->to_par));
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gst_structure_set (gst_caps_get_structure (newcaps, 0),
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"pixel-aspect-ratio", GST_TYPE_FRACTION,
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gst_value_get_fraction_numerator (videoscale->to_par),
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gst_value_get_fraction_denominator (videoscale->to_par), NULL);
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}
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}
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GST_DEBUG_OBJECT (videoscale, "trying to set caps %" GST_PTR_FORMAT
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" on pad %s:%s", newcaps, GST_DEBUG_PAD_NAME (otherpad));
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ret = gst_pad_try_set_caps (otherpad, newcaps);
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if (GST_PAD_LINK_FAILED (ret)) {
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return GST_PAD_LINK_REFUSED;
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newwidth = width;
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newheight = height * den / num;
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}
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} else {
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/* (at least) one has no par, so it should accept the other */
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newwidth = width;
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newheight = height;
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}
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/* size: don't check return values. We honestly don't care. */
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gst_structure_set_value (newstructure, "width",
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gst_structure_get_value (otherstructure, "width"));
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gst_structure_set_value (newstructure, "height",
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gst_structure_get_value (otherstructure, "height"));
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gst_caps_structure_fixate_field_nearest_int (newstructure, "width", newwidth);
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gst_caps_structure_fixate_field_nearest_int (newstructure,
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"height", newheight);
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gst_structure_get_int (newstructure, "width", &newwidth);
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gst_structure_get_int (newstructure, "height", &newheight);
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/* obviously, keep PAR if we got one */
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if (otherpar)
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gst_structure_set_value (newstructure, "pixel-aspect-ratio", otherpar);
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GST_DEBUG_OBJECT (videoscale,
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"trying to set caps %" GST_PTR_FORMAT " on pad %s:%s for non-passthru",
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caps, GST_DEBUG_PAD_NAME (otherpad));
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/* try - bail out if fail */
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ret = gst_pad_try_set_caps (otherpad, newcaps);
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if (GST_PAD_LINK_FAILED (ret))
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return ret;
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videoscale->passthru = FALSE;
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GST_DEBUG_OBJECT (videoscale,
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"no passthru, otherpad %s:%s is not negotiated",
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GST_DEBUG_PAD_NAME (otherpad));
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beach:
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/* since we're accepting these caps on this pad, we can store the
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* values we're using in conversion, like from/to w,h,PAR */
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othercaps = gst_pad_get_caps (otherpad);
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otherstructure = gst_caps_get_structure (othercaps, 0);
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structure = gst_caps_get_structure (caps, 0);
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par = gst_structure_get_value (structure, "pixel-aspect-ratio");
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otherpar = gst_structure_get_value (otherstructure, "pixel-aspect-ratio");
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GST_DEBUG ("othercaps: %" GST_PTR_FORMAT, othercaps);
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if (par && otherpar) {
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GST_DEBUG_OBJECT (videoscale, "par %d/%d, otherpar %d/%d",
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gst_value_get_fraction_numerator (par),
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gst_value_get_fraction_denominator (par),
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gst_value_get_fraction_numerator (otherpar),
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gst_value_get_fraction_denominator (otherpar));
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}
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/* whee, works. Save for use in _chain and get moving. */
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if (pad == videoscale->srcpad) {
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videoscale->to_width = width;
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videoscale->to_height = height;
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if (par) {
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g_free (videoscale->to_par);
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videoscale->to_par = g_new0 (GValue, 1);
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gst_value_init_and_copy (videoscale->to_par, par);
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}
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videoscale->from_width = newwidth;
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videoscale->from_height = newheight;
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} else {
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videoscale->from_width = width;
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videoscale->from_height = height;
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if (par) {
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g_free (videoscale->from_par);
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videoscale->from_par = g_new0 (GValue, 1);
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gst_value_init_and_copy (videoscale->from_par, par);
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}
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videoscale->to_width = newwidth;
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videoscale->to_height = newheight;
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}
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videoscale->format = format;
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gst_videoscale_setup (videoscale);
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GST_DEBUG_OBJECT (videoscale, "work completed");
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if (gst_pad_is_negotiated (otherpad)) {
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gst_videoscale_setup (videoscale);
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}
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return GST_PAD_LINK_OK;
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}
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