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audioresample: Optimize transform_caps()

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If the second and next caps structures are a subset of the already existing
transformed caps we can safely skip them because we would transform them to
the same caps again.
This commit is contained in:
Sebastian Dröge 2011-05-27 14:20:08 +02:00
parent 4fcd621101
commit a2162b07ad
1 changed files with 12 additions and 6 deletions
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18
gst/audioresample/gstaudioresample.c
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@ -293,10 +293,16 @@ gst_audio_resample_transform_caps (GstBaseTransform * base,
/* transform single caps into input_caps + input_caps with the rate
* field set to our supported range. This ensures that upstream knows
* about downstream's prefered rate(s) and can negotiate accordingly. */
res = gst_caps_copy (caps);
n = gst_caps_get_size (res);
res = gst_caps_new_empty ();
n = gst_caps_get_size (caps);
for (i = 0; i < n; i++) {
s = gst_caps_get_structure (caps, i);
/* If this is already expressed by the existing caps
* skip this structure */
if (i > 0 && gst_caps_is_subset_structure (res, s))
continue;
/* first, however, check if the caps contain a range for the rate field, in
* which case that side isn't going to care much about the exact sample rate
* chosen and we should just assume things will get fixated to something sane
@ -305,17 +311,17 @@ gst_audio_resample_transform_caps (GstBaseTransform * base,
* real preference or limitation and we should maintain that structure as
* preference by putting it first into the transformed caps, and only add
* our full rate range as second option */
s = gst_caps_get_structure (res, i);
s = gst_structure_copy (s);
val = gst_structure_get_value (s, "rate");
if (val == NULL || GST_VALUE_HOLDS_INT_RANGE (val)) {
/* overwrite existing range, or add field if it doesn't exist yet */
gst_structure_set (s, "rate", GST_TYPE_INT_RANGE, 1, G_MAXINT, NULL);
} else {
/* append caps with full range to existing caps with non-range rate field */
s = gst_structure_copy (s);
gst_caps_append_structure (res, gst_structure_copy (s));
gst_structure_set (s, "rate", GST_TYPE_INT_RANGE, 1, G_MAXINT, NULL);
gst_caps_merge_structure (res, s);
}
gst_caps_append_structure (res, s);
}
if (filter) {