Originally from:
https://github.com/MythTV/mythtv/commit/669955c6cb29196b4b5120451b5b998d67a65749
---
libavcodec/v4l2_buffers.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/libavcodec/v4l2_buffers.c b/libavcodec/v4l2_buffers.c
index 23474ee143..85dfb40093 100644
--- a/libavcodec/v4l2_buffers.c
+++ b/libavcodec/v4l2_buffers.c
@@ -210,6 +210,25 @@ static enum AVColorTransferCharacteristic
v4l2_get_color_trc(V4L2Buffer *buf)
return AVCOL_TRC_UNSPECIFIED;
}
+static void v4l2_get_interlacing(AVFrame *frame, V4L2Buffer *buf)
+{
+ enum v4l2_field field;
+ field = V4L2_TYPE_IS_MULTIPLANAR(buf->buf.type) ?
+ buf->context->format.fmt.pix_mp.field :
+ buf->context->format.fmt.pix.field;
+
+ if (field == V4L2_FIELD_INTERLACED || field == V4L2_FIELD_INTERLACED_TB) {
+ frame->flags |= AV_FRAME_FLAG_INTERLACED;
+ frame->flags |= AV_FRAME_FLAG_TOP_FIELD_FIRST;
+ } else if (field == V4L2_FIELD_INTERLACED_BT) {
+ frame->flags |= AV_FRAME_FLAG_INTERLACED;
+ frame->flags &= ~AV_FRAME_FLAG_TOP_FIELD_FIRST;
+ } else {
+ frame->flags &= ~AV_FRAME_FLAG_INTERLACED;
+ frame->flags &= ~AV_FRAME_FLAG_TOP_FIELD_FIRST;
+ }
+}
+
static void v4l2_free_buffer(void *opaque, uint8_t *unused)
{
V4L2Buffer* avbuf = opaque;
@@ -434,6 +453,7 @@ int ff_v4l2_buffer_buf_to_avframe(AVFrame *frame,
V4L2Buffer *avbuf)
frame->color_trc = v4l2_get_color_trc(avbuf);
frame->pts = v4l2_get_pts(avbuf);
frame->pkt_dts = AV_NOPTS_VALUE;
+ v4l2_get_interlacing(frame, avbuf);
/* these values are updated also during re-init in
v4l2_process_driver_event */
frame->height = avbuf->context->height;
--
2.43.0
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