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gst/videoscale/gstvideoscale.c: Introduce back caps fixate with handling of PAR.

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Original commit message from CVS:
2005-11-18  Julien MOUTTE  <julien@moutte.net>

* gst/videoscale/gstvideoscale.c: (gst_videoscale_class_init),
(gst_videoscale_fixate_caps): Introduce back caps fixate with
handling of PAR.
This commit is contained in:
Julien Moutte 2005-11-18 17:31:17 +00:00
parent 8a955ff2c2
commit 4f1890270b
2 changed files with 109 additions and 4 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2005-11-18 Julien MOUTTE <julien@moutte.net>
* gst/videoscale/gstvideoscale.c: (gst_videoscale_class_init),
(gst_videoscale_fixate_caps): Introduce back caps fixate with
handling of PAR.
2005-11-18 <bilboed@dvdsrc.fluendo.com>
* gst/playback/gstdecodebin.c: (gst_decode_bin_init):

107
gst/videoscale/gstvideoscale.c
View file

@ -153,6 +153,8 @@ static gboolean gst_videoscale_get_unit_size (GstBaseTransform * trans,
GstCaps * caps, guint * size);
static GstFlowReturn gst_videoscale_transform (GstBaseTransform * trans,
GstBuffer * in, GstBuffer * out);
static void gst_videoscale_fixate_caps (GstBaseTransform * base,
GstPadDirection direction, GstCaps * caps, GstCaps * othercaps);
static void gst_videoscale_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
@ -216,10 +218,12 @@ gst_videoscale_class_init (GstVideoscaleClass * klass)
g_param_spec_enum ("method", "method", "method",
GST_TYPE_VIDEOSCALE_METHOD, 0, G_PARAM_READWRITE));
trans_class->transform_caps = gst_videoscale_transform_caps;
trans_class->set_caps = gst_videoscale_set_caps;
trans_class->get_unit_size = gst_videoscale_get_unit_size;
trans_class->transform = gst_videoscale_transform;
trans_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_videoscale_transform_caps);
trans_class->set_caps = GST_DEBUG_FUNCPTR (gst_videoscale_set_caps);
trans_class->get_unit_size = GST_DEBUG_FUNCPTR (gst_videoscale_get_unit_size);
trans_class->transform = GST_DEBUG_FUNCPTR (gst_videoscale_transform);
trans_class->fixate_caps = GST_DEBUG_FUNCPTR (gst_videoscale_fixate_caps);
trans_class->passthrough_on_same_caps = TRUE;
@ -457,6 +461,101 @@ gst_videoscale_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
return TRUE;
}
static void
gst_videoscale_fixate_caps (GstBaseTransform * base, GstPadDirection direction,
GstCaps * caps, GstCaps * othercaps)
{
GstStructure *ins, *outs;
const GValue *from_par, *to_par;
g_return_if_fail (gst_caps_is_fixed (caps));
GST_DEBUG_OBJECT (base, "trying to fixate othercaps %" GST_PTR_FORMAT
" based on caps %" GST_PTR_FORMAT, othercaps, caps);
ins = gst_caps_get_structure (caps, 0);
outs = gst_caps_get_structure (othercaps, 0);
from_par = gst_structure_get_value (ins, "pixel-aspect-ratio");
to_par = gst_structure_get_value (outs, "pixel-aspect-ratio");
if (from_par && to_par) {
GValue to_ratio = { 0, }; /* w/h of output video */
int from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d;
int count = 0, w = 0, h = 0, num, den;
/* if both width and height are already fixed, we can't do anything
* about it anymore */
if (gst_structure_get_int (outs, "width", &w))
++count;
if (gst_structure_get_int (outs, "height", &h))
++count;
if (count == 2) {
GST_DEBUG_OBJECT (base, "dimensions already set to %dx%d, not fixating",
w, h);
return;
}
gst_structure_get_int (ins, "width", &from_w);
gst_structure_get_int (ins, "height", &from_h);
from_par_n = gst_value_get_fraction_numerator (from_par);
from_par_d = gst_value_get_fraction_denominator (from_par);
to_par_n = gst_value_get_fraction_numerator (to_par);
to_par_d = gst_value_get_fraction_denominator (to_par);
g_value_init (&to_ratio, GST_TYPE_FRACTION);
gst_value_set_fraction (&to_ratio, from_w * from_par_n * to_par_d,
from_h * from_par_d * to_par_n);
num = gst_value_get_fraction_numerator (&to_ratio);
den = gst_value_get_fraction_denominator (&to_ratio);
GST_DEBUG_OBJECT (base,
"scaling input with %dx%d and PAR %d/%d to output PAR %d/%d",
from_w, from_h, from_par_n, from_par_d, to_par_n, to_par_d);
GST_DEBUG_OBJECT (base, "resulting output should respect ratio of %d/%d",
num, den);
/* now find a width x height that respects this display ratio.
* prefer those that have one of w/h the same as the incoming video
* using wd / hd = num / den */
/* start with same height, because of interlaced video */
/* check hd / den is an integer scale factor, and scale wd with the PAR */
if (from_h % den == 0) {
GST_DEBUG_OBJECT (base, "keeping video height");
h = from_h;
w = h * num / den;
} else if (from_w % num == 0) {
GST_DEBUG_OBJECT (base, "keeping video width");
w = from_w;
h = w * den / num;
} else {
GST_DEBUG_OBJECT (base, "approximating but keeping video height");
h = from_h;
w = h * num / den;
}
GST_DEBUG_OBJECT (base, "scaling to %dx%d", w, h);
/* now fixate */
gst_caps_structure_fixate_field_nearest_int (outs, "width", w);
gst_caps_structure_fixate_field_nearest_int (outs, "height", h);
} else {
gint width, height;
if (gst_structure_get_int (ins, "width", &width)) {
if (gst_structure_has_field (outs, "width")) {
gst_caps_structure_fixate_field_nearest_int (outs, "width", width);
}
}
if (gst_structure_get_int (ins, "height", &height)) {
if (gst_structure_has_field (outs, "height")) {
gst_caps_structure_fixate_field_nearest_int (outs, "height", height);
}
}
}
GST_DEBUG_OBJECT (base, "fixated othercaps to %" GST_PTR_FORMAT, othercaps);
}
static gboolean
gst_videoscale_prepare_image (gint format, GstBuffer * buf,
VSImage * img, VSImage * img_u, VSImage * img_v)