gstreamer/sys/v4l2codecs/gstv4l2format.c

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/* 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},
{V4L2_PIX_FMT_YUYV, 1, GST_VIDEO_FORMAT_YUY2, 8, 422},
{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;
}
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)
{
gint estride;
switch (finfo->format) {
case GST_VIDEO_FORMAT_NV12:
case GST_VIDEO_FORMAT_NV12_64Z32:
case GST_VIDEO_FORMAT_NV21:
case GST_VIDEO_FORMAT_NV16:
case GST_VIDEO_FORMAT_NV61:
case GST_VIDEO_FORMAT_NV24:
estride = (plane == 0 ? 1 : 2) *
GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (finfo, plane, stride);
break;
default:
estride = GST_VIDEO_FORMAT_INFO_SCALE_WIDTH (finfo, plane, stride);
break;
}
return estride;
}
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);
struct v4l2_pix_format_mplane *pix_mp = &fmt->fmt.pix_mp;
gint plane;
gsize offset = 0;
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,
pix_mp->width, pix_mp->height))
return FALSE;
/* TODO: We don't support multi-allocation yet */
g_return_val_if_fail (pix_mp->num_planes == 1, FALSE);
out_info->size = pix_mp->plane_fmt[0].sizeimage;
for (plane = 0; plane < GST_VIDEO_INFO_N_PLANES (out_info); plane++) {
gint stride = extrapolate_stride (out_info->finfo, plane,
pix_mp->plane_fmt[0].bytesperline);
out_info->stride[plane] = stride;
out_info->offset[plane] = offset;
offset += stride * GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (out_info->finfo,
plane, pix_mp->height);
}
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;
}