gstreamer/subprojects/gst-plugins-bad/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},
{V4L2_PIX_FMT_SUNXI_TILED_NV12, 1, GST_VIDEO_FORMAT_NV12_32L32, 8, 422},
{V4L2_PIX_FMT_NV12_4L4, 1, GST_VIDEO_FORMAT_NV12_4L4, 8, 420},
{V4L2_PIX_FMT_MM21, 2, GST_VIDEO_FORMAT_NV12_16L32S, 8, 420},
{V4L2_PIX_FMT_YUV420M, 3, GST_VIDEO_FORMAT_I420, 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;
}
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 void
set_stride (GstVideoInfo * info, gint plane, gint stride)
{
const GstVideoFormatInfo *finfo = info->finfo;
if (GST_VIDEO_FORMAT_INFO_IS_TILED (finfo)) {
guint x_tiles, y_tiles, ws, hs, padded_height;
gst_video_format_info_get_tile_sizes (finfo, plane, &ws, &hs);
padded_height = GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (finfo, plane,
info->height);
padded_height = GST_ROUND_UP_N (padded_height, 1 << hs);
x_tiles = stride >> ws;
y_tiles = padded_height >> hs;
info->stride[plane] = GST_VIDEO_TILE_MAKE_STRIDE (x_tiles, y_tiles);
} else {
info->stride[plane] = stride;
}
}
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;
struct v4l2_pix_format *pix = &fmt->fmt.pix;
gint plane;
gsize offset = 0;
gboolean extrapolate = FALSE;
if (!entry)
return FALSE;
/* validate the entry against the format */
if (V4L2_TYPE_IS_MULTIPLANAR (fmt->type)) {
if (entry->num_planes != pix_mp->num_planes) {
GST_ERROR ("Miss-matched number of planes in internal entry "
"(%i != %i)", entry->num_planes, pix_mp->num_planes);
return FALSE;
}
} else if (entry->num_planes != 1) {
GST_ERROR ("Miss-matched number of planes in internal entry "
"(must be 1 for non-multiplanar, got %i)", entry->num_planes);
return FALSE;
}
if (!gst_video_info_set_format (out_info, entry->gst_fmt,
pix_mp->width, pix_mp->height))
return FALSE;
if (V4L2_TYPE_IS_MULTIPLANAR (fmt->type)) {
out_info->size = 0;
for (plane = 0; plane < pix_mp->num_planes; plane++)
out_info->size += pix_mp->plane_fmt[plane].sizeimage;
} else {
out_info->size = pix->sizeimage;
}
/*
* When single allocation formats are used for planar formats we need to
* extrapolate the per-plane stride. Do this check once to prevent
* complex inner loop.
*/
if (entry->num_planes == 1 && out_info->finfo->n_planes != entry->num_planes)
extrapolate = TRUE;
for (plane = 0; plane < GST_VIDEO_INFO_N_PLANES (out_info); plane++) {
gint stride;
if (V4L2_TYPE_IS_MULTIPLANAR (fmt->type)) {
if (extrapolate)
stride = gst_video_format_info_extrapolate_stride (out_info->finfo,
plane, pix_mp->plane_fmt[0].bytesperline);
else
stride = pix_mp->plane_fmt[plane].bytesperline;
} else {
if (extrapolate)
stride = gst_video_format_info_extrapolate_stride (out_info->finfo,
plane, pix->bytesperline);
else
stride = pix->bytesperline;
}
set_stride (out_info, plane, stride);
out_info->offset[plane] = offset;
if ((V4L2_TYPE_IS_MULTIPLANAR (fmt->type) && !extrapolate))
offset += pix_mp->plane_fmt[plane].sizeimage;
else
offset += stride * GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (out_info->finfo,
plane, pix_mp->height);
}
/* Check that the extrapolation didn't overflow the reported sizeimage */
if (extrapolate && offset > out_info->size) {
GST_ERROR ("Extrapolated plane offset overflow the image size.");
return FALSE;
}
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;
}