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v4l2format: Convert between V4L2 and GST video format

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This will be needed in the output format negotiation.
This commit is contained in:
Nicolas Dufresne 2020-03-13 16:51:27 -04:00
parent 2a1836f183
commit 6494d7b056
2 changed files with 46 additions and 0 deletions
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40
sys/v4l2codecs/gstv4l2format.c
View file

@ -52,6 +52,22 @@ lookup_v4l2_fmt (guint v4l2_pix_fmt)
return ret;
}
static struct FormatEntry *
lookup_gst_fmt (GstVideoFormat gst_fmt)
{
gint i;
struct FormatEntry *ret = NULL;
for (i = 0; format_map[i].v4l2_pix_fmt; i++) {
if (format_map[i].gst_fmt == gst_fmt) {
ret = format_map + i;
break;
}
}
return ret;
}
static gint
extrapolate_stride (const GstVideoFormatInfo * finfo, gint plane, gint stride)
{
@ -113,3 +129,27 @@ gst_v4l2_format_to_video_info (struct v4l2_format * fmt,
return TRUE;
}
gboolean
gst_v4l2_format_to_video_format (guint32 pix_fmt, GstVideoFormat * out_format)
{
struct FormatEntry *entry = lookup_v4l2_fmt (pix_fmt);
if (!entry)
return FALSE;
*out_format = entry->gst_fmt;
return TRUE;
}
gboolean
gst_v4l2_format_from_video_format (GstVideoFormat format, guint32 * out_pix_fmt)
{
struct FormatEntry *entry = lookup_gst_fmt (format);
if (!entry)
return FALSE;
*out_pix_fmt = entry->v4l2_pix_fmt;
return TRUE;
}

6
sys/v4l2codecs/gstv4l2format.h
View file

@ -27,4 +27,10 @@
gboolean gst_v4l2_format_to_video_info (struct v4l2_format * fmt,
GstVideoInfo * out_info);
gboolean gst_v4l2_format_to_video_format (guint32 pix_fmt,
GstVideoFormat * out_format);
gboolean gst_v4l2_format_from_video_format (GstVideoFormat format,
guint32 * out_pix_fmt);
#endif /* __GST_V4L2_FORMAT_H__ */