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v4l2codecs: Add initial formats helpers

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This commit is contained in:
Nicolas Dufresne 2020-02-10 18:02:37 -05:00
parent a007e2dd9d
commit 020a019fd6
3 changed files with 108 additions and 0 deletions
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77
sys/v4l2codecs/gstv4l2format.c Normal file
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@ -0,0 +1,77 @@
/* GStreamer
* Copyright (C) 2020 Nicolas Dufresne <nicolas.dufresne@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "gstv4l2format.h"
#define GST_CAT_DEFAULT gstv4l2codecs_debug
GST_DEBUG_CATEGORY_EXTERN (gstv4l2codecs_debug);
struct FormatEntry
{
guint32 v4l2_pix_fmt;
gint num_planes;
GstVideoFormat gst_fmt;
guint bitdepth;
gint subsampling;
};
static struct FormatEntry format_map[] = {
{V4L2_PIX_FMT_NV12, 1, GST_VIDEO_FORMAT_NV12, 8, 420},
{0,}
};
static struct FormatEntry *
lookup_v4l2_fmt (guint v4l2_pix_fmt)
{
gint i;
struct FormatEntry *ret = NULL;
for (i = 0; format_map[i].v4l2_pix_fmt; i++) {
if (format_map[i].v4l2_pix_fmt == v4l2_pix_fmt) {
ret = format_map + i;
break;
}
}
return ret;
}
gboolean
gst_v4l2_format_to_video_info (struct v4l2_format * fmt,
GstVideoInfo * out_info)
{
struct FormatEntry *entry = lookup_v4l2_fmt (fmt->fmt.pix_mp.pixelformat);
if (!entry)
return FALSE;
if (entry->num_planes != 1) {
GST_FIXME ("Multi allocation formats are not supported yet");
return FALSE;
}
if (!gst_video_info_set_format (out_info, entry->gst_fmt,
fmt->fmt.pix_mp.width, fmt->fmt.pix_mp.height))
return FALSE;
/* FIXME play the extrapolation danse for single FDs formats, and copy over
* stride/offsets/size for the other formats */
return TRUE;
}

30
sys/v4l2codecs/gstv4l2format.h Normal file
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@ -0,0 +1,30 @@
/* GStreamer
* Copyright (C) 2020 Nicolas Dufresne <nicolas.dufresne@collabora.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_V4L2_FORMAT_H__
#define __GST_V4L2_FORMAT_H__
#include <gst/gst.h>
#include <gst/video/video.h>
#include "linux/videodev2.h"
gboolean gst_v4l2_format_to_video_info (struct v4l2_format * fmt,
GstVideoInfo * out_info);
#endif /* __GST_V4L2_FORMAT_H__ */

1
sys/v4l2codecs/meson.build
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@ -3,6 +3,7 @@ v4l2codecs_sources = [
'gstv4l2codecdevice.c',
'gstv4l2codech264dec.c',
'gstv4l2decoder.c',
'gstv4l2format.c',
]
libgudev_dep = dependency('gudev-1.0', required: get_option('v4l2codecs'))