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v4l2codecs: Read driver provided stride

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This implements driver stride support but only for single allocation buffers.
This code is imported from the original v4l2 plugin and adapted to the new
helper context.
This commit is contained in:
Nicolas Dufresne 2020-03-13 14:23:39 -04:00
parent 21652a8e52
commit 2a1836f183
1 changed files with 41 additions and 3 deletions
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44
sys/v4l2codecs/gstv4l2format.c
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@ -52,11 +52,37 @@ lookup_v4l2_fmt (guint v4l2_pix_fmt)
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;
@ -67,11 +93,23 @@ gst_v4l2_format_to_video_info (struct v4l2_format * fmt,
}
if (!gst_video_info_set_format (out_info, entry->gst_fmt,
fmt->fmt.pix_mp.width, fmt->fmt.pix_mp.height))
pix_mp->width, pix_mp->height))
return FALSE;
/* FIXME play the extrapolation danse for single FDs formats, and copy over
* stride/offsets/size for the other formats */
/* 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;
}