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deinterlace: Better alternate support

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Improve line offset halving based on whether this field is top or
bottom.

Also handle the buffer state the same as mixed.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/866>
This commit is contained in:
Vivia Nikolaidou 2021-01-30 15:49:23 +02:00
parent 5f00810ee0
commit 4c4e1b580e
2 changed files with 27 additions and 3 deletions
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3
gst/deinterlace/gstdeinterlace.c
View file

@ -1029,7 +1029,8 @@ gst_deinterlace_get_buffer_state (GstDeinterlace * self, GstVideoFrame * frame,
interlacing_mode = GST_VIDEO_INTERLACE_MODE_INTERLEAVED;
if (state) {
if (interlacing_mode == GST_VIDEO_INTERLACE_MODE_MIXED) {
if (interlacing_mode == GST_VIDEO_INTERLACE_MODE_MIXED ||
interlacing_mode == GST_VIDEO_INTERLACE_MODE_ALTERNATE) {
if (GST_VIDEO_FRAME_IS_RFF (frame)) {
*state = GST_DEINTERLACE_BUFFER_STATE_RFF;
} else if (GST_VIDEO_FRAME_IS_ONEFIELD (frame)) {

27
gst/deinterlace/gstdeinterlacemethod.c
View file

@ -333,12 +333,35 @@ get_line (LinesGetter * lg, gint field_offset, guint plane, gint line,
frame = lg->history[idx].frame;
g_assert (frame);
/* Now frame already refers to the field we want, the correct one is taken
* from the history */
if (GST_VIDEO_FRAME_FLAG_IS_SET (frame, GST_VIDEO_FRAME_FLAG_TOP_FIELD) ||
GST_VIDEO_FRAME_FLAG_IS_SET (frame, GST_VIDEO_FRAME_FLAG_BOTTOM_FIELD)) {
/* Alternate frame containing a single field, adjust the line index */
line /= 2;
if (line_offset != 1)
line_offset /= 2;
switch (line_offset) {
case -2:
case 2:
line_offset /= 2;
break;
case 1:
/* the "next" line of a top field line is the same line of a bottom
* field */
if (!GST_VIDEO_FRAME_FLAG_IS_SET (frame, GST_VIDEO_FRAME_FLAG_TFF))
line_offset = 0;
break;
case -1:
/* the "previous" line of a bottom field line is the same line of a
* top field */
if (GST_VIDEO_FRAME_FLAG_IS_SET (frame, GST_VIDEO_FRAME_FLAG_TFF))
line_offset = 0;
break;
case 0:
break;
default:
g_assert_not_reached ();
break;
}
}
frame_height = GST_VIDEO_FRAME_COMP_HEIGHT (frame, plane);