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audioconvert: prefer channels of base caps when fixating

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... which in turn prefers to preserve input channels when converting.
This commit is contained in:
Mark Nauwelaerts 2012-07-25 14:55:56 +02:00
parent e1137b8c66
commit 88e73f8515
1 changed files with 22 additions and 5 deletions
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27
gst/audioconvert/gstaudioconvert.c
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@ -267,7 +267,7 @@ parse_error:
/* copies the given caps */
static GstCaps *
gst_audio_convert_caps_remove_format_info (GstCaps * caps)
gst_audio_convert_caps_remove_format_info (GstCaps * caps, gboolean channels)
{
GstStructure *st;
gint i, n;
@ -278,6 +278,8 @@ gst_audio_convert_caps_remove_format_info (GstCaps * caps)
n = gst_caps_get_size (caps);
for (i = 0; i < n; i++) {
gboolean remove_channels = FALSE;
st = gst_caps_get_structure (caps, i);
/* If this is already expressed by the existing caps
@ -292,11 +294,14 @@ gst_audio_convert_caps_remove_format_info (GstCaps * caps)
if (gst_structure_get (st, "channel-mask", GST_TYPE_BITMASK, &channel_mask,
NULL)) {
if (channel_mask != 0)
gst_structure_remove_fields (st, "channel-mask", "channels", NULL);
remove_channels = TRUE;
} else {
gst_structure_remove_fields (st, "channel-mask", "channels", NULL);
remove_channels = TRUE;
}
if (remove_channels && channels)
gst_structure_remove_fields (st, "channel-mask", "channels", NULL);
gst_caps_append_structure (res, st);
}
@ -314,7 +319,7 @@ gst_audio_convert_transform_caps (GstBaseTransform * btrans,
GstCaps *result;
/* Get all possible caps that we can transform to */
tmp = gst_audio_convert_caps_remove_format_info (caps);
tmp = gst_audio_convert_caps_remove_format_info (caps, TRUE);
if (filter) {
tmp2 = gst_caps_intersect_full (filter, tmp, GST_CAPS_INTERSECT_FIRST);
@ -593,13 +598,25 @@ gst_audio_convert_fixate_caps (GstBaseTransform * base,
result = gst_caps_intersect (othercaps, caps);
if (gst_caps_is_empty (result)) {
GstCaps *removed;
if (result)
gst_caps_unref (result);
result = othercaps;
/* try to preserve channels */
removed = gst_audio_convert_caps_remove_format_info (caps, FALSE);
result = gst_caps_intersect (othercaps, removed);
gst_caps_unref (removed);
if (gst_caps_is_empty (result)) {
if (result)
gst_caps_unref (result);
result = othercaps;
}
} else {
gst_caps_unref (othercaps);
}
GST_DEBUG_OBJECT (base, "now fixating %" GST_PTR_FORMAT, result);
/* fixate remaining fields */
result = gst_caps_make_writable (result);