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winks: provide guessed pixel-aspect-ratio in caps

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Knut Inge Hvidsten 2009-08-31 19:25:02 +02:00 committed by Ole André Vadla Ravnås
parent a5beb0b8ff
commit a54972f806
1 changed files with 33 additions and 0 deletions
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33
sys/winks/ksvideohelpers.c
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@ -1,6 +1,7 @@
/*
* Copyright (C) 2007 Haakon Sporsheim <hakon.sporsheim@tandberg.com>
* 2008 Ole André Vadla Ravnås <ole.andre.ravnas@tandberg.com>
* 2009 Knut Inge Hvidsten <knut.inge.hvidsten@tandberg.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
@ -155,6 +156,28 @@ ks_video_format_to_structure (GUID subtype_guid, GUID format_guid)
return structure;
}
static void
guess_aspect (gint width, gint height, gint * par_width, gint * par_height)
{
/*
* As we dont have access to the actual pixel aspect, we will try to do a
* best-effort guess. The guess is based on most sensors being either 4/3
* or 16/9, and most pixel aspects being close to 1/1.
*/
if ((width == 768) && (height == 448)) { /* special case for w448p */
*par_width = 28;
*par_height = 27;
} else {
if (((float) width / (float) height) < 1.2778) {
*par_width = 12;
*par_height = 11;
} else {
*par_width = 1;
*par_height = 1;
}
}
}
static gboolean
ks_video_append_video_stream_cfg_fields (GstStructure * structure,
const KS_VIDEO_STREAM_CONFIG_CAPS * vscc)
@ -194,6 +217,16 @@ ks_video_append_video_stream_cfg_fields (GstStructure * structure,
(gint) (10000000 / vscc->MinFrameInterval), 1, NULL);
}
{
gint par_width, par_height;
guess_aspect (vscc->MaxOutputSize.cx, vscc->MaxOutputSize.cy,
&par_width, &par_height);
gst_structure_set (structure,
"pixel-aspect-ratio", GST_TYPE_FRACTION, par_width, par_height, NULL);
}
return TRUE;
}