From d4db3fd962138805227e55cfa16fefe5323b63de Mon Sep 17 00:00:00 2001
From: Julian Scheel <julian@jusst.de>
Date: Sat, 12 Jun 2010 12:31:04 +0200
Subject: interlaced/progressive detection implemented a proper detection of
 interlaced/progressive content to enable deinterlacing only when needed

---
 src/video_dec/libvdpau/nal.h        |  7 ++++++
 src/video_dec/libvdpau/vdpau_h264.c | 44 +++++++++++++++++++++++++++++++------
 2 files changed, 44 insertions(+), 7 deletions(-)

diff --git a/src/video_dec/libvdpau/nal.h b/src/video_dec/libvdpau/nal.h
index 60e3c22b0..b2fe581ad 100644
--- a/src/video_dec/libvdpau/nal.h
+++ b/src/video_dec/libvdpau/nal.h
@@ -56,6 +56,13 @@ enum pic_struct {
   DISP_FRAME_TRIPLING
 };
 
+enum ct_type {
+    CT_PROGRESSIVE = 0,
+    CT_INTERLACED,
+    CT_UNKNOWN,
+    CT_RESERVED
+};
+
 /* slice types repeat from 5-9, we
  * need a helper function for comparison
  */
diff --git a/src/video_dec/libvdpau/vdpau_h264.c b/src/video_dec/libvdpau/vdpau_h264.c
index 04ab8f8fe..72ee39868 100644
--- a/src/video_dec/libvdpau/vdpau_h264.c
+++ b/src/video_dec/libvdpau/vdpau_h264.c
@@ -290,6 +290,41 @@ static void fill_vdpau_pictureinfo_h264(video_decoder_t *this_gen, uint32_t slic
 
 }
 
+int check_progressive(struct coded_picture *pic)
+{
+  if (pic->flag_mask & PIC_STRUCT_PRESENT) {
+    uint8_t pic_struct = pic->sei_nal->sei.pic_timing.pic_struct;
+
+    if (pic_struct == DISP_FRAME) {
+      return 1;
+    } else if (pic_struct == DISP_TOP_BOTTOM ||
+        pic_struct == DISP_BOTTOM_TOP) {
+      return 0;
+    }
+
+    /* FIXME: seems unreliable, maybe it's has to be interpreted more complex */
+    /*if (pic->sei_nal->sei.pic_timing.ct_type == CT_INTERLACED) {
+      return 0;
+    } else if (pic->sei_nal->sei.pic_timing.ct_type == CT_PROGRESSIVE) {
+      return 1;
+    } */
+  }
+
+  if (pic->slc_nal->slc.field_pic_flag && pic->pps_nal->pps.pic_order_present_flag) {
+    if(pic->slc_nal->slc.delta_pic_order_cnt_bottom == 1 ||
+        pic->slc_nal->slc.delta_pic_order_cnt_bottom == -1) {
+      return 0;
+    } else {
+      return 1;
+    }
+  }
+  if (!pic->slc_nal->slc.field_pic_flag & pic->sps_nal->sps.frame_mbs_only_flag) {
+    return 1;
+  }
+
+  return 0;
+}
+
 static int vdpau_decoder_init(video_decoder_t *this_gen)
 {
   vdpau_h264_decoder_t *this = (vdpau_h264_decoder_t *)this_gen;
@@ -526,13 +561,8 @@ static int vdpau_decoder_render(video_decoder_t *this_gen, VdpBitstreamBuffer *v
   else {
     img->bad_frame = 0;
 
-    img->progressive_frame = 0;
-
-    if(/*(sps->vui_parameters_present_flag &&
-        sps->vui_parameters.pic_struct_present_flag &&
-        !(this->completed_pic->flag_mask & INTERLACED)) ||*/
-        (!pic.field_pic_flag && !pic.mb_adaptive_frame_field_flag))
-      img->progressive_frame = 1;
+    img->progressive_frame = check_progressive(this->completed_pic);
+    printf("progressive: %d\n", img->progressive_frame);
 
     if(!img->progressive_frame && this->completed_pic->repeat_pic)
       img->repeat_first_field = 1;
-- 
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