Add option for native deinterlace

This option will try to set monitor to matching interlaced hdmi mode and will try to output fields correctly so display can handle deinterlace.
It will only work in limited situations:
  The framerate must be supported by display
  The resolution must exactly match display
  All frames must have same interlace flags and be encoded as a pair of weaved fields

Requires updated firmware

README.md

@@ -64,6 +64,7 @@ Using OMXPlayer
          -p / --passthrough             audio passthrough
          -d / --deinterlace             force deinterlacing
               --nodeinterlace           force no deinterlacing
+              --nativedeinterlace       Let display handle interlace
               --anaglyph type           Convert 3d to anaglyph
          -w / --hw                      hw audio decoding
          -3 / --3d mode                 switch tv into 3d mode (e.g. SBS/TB)

omxplayer.cpp

@@ -82,6 +82,7 @@ long              m_Volume              = 0;
 long              m_Amplification       = 0;
 bool              m_Deinterlace         = false;
 bool              m_NoDeinterlace       = false;
+bool              m_NativeDeinterlace   = false;
 OMX_IMAGEFILTERANAGLYPHTYPE m_anaglyph  = OMX_ImageFilterAnaglyphNone;
 bool              m_HWDecode            = false;
 std::string       deviceString          = "";
@@ -162,6 +163,7 @@ void print_usage()
   printf("         -p / --passthrough             audio passthrough\n");
   printf("         -d / --deinterlace             force deinterlacing\n");
   printf("              --nodeinterlace           force no deinterlacing\n");
+  printf("              --nativedeinterlace       Let display handle interlace\n");
   printf("              --anaglyph type           Convert 3d to anaglyph\n");
   printf("         -w / --hw                      hw audio decoding\n");
   printf("         -3 / --3d mode                 switch tv into 3d mode (e.g. SBS/TB)\n");
@@ -388,7 +390,7 @@ void SetVideoMode(int width, int height, int fpsrate, int fpsscale, FORMAT_3D_T
   if (num_modes > 0 && prefer_group != HDMI_RES_GROUP_INVALID)
   {
     uint32_t best_score = 1<<30;
-    uint32_t scan_mode = 0;
+    uint32_t scan_mode = m_NativeDeinterlace;
 
     for (i=0; i<num_modes; i++)
     {
@@ -404,7 +406,7 @@ void SetVideoMode(int width, int height, int fpsrate, int fpsscale, FORMAT_3D_T
       else if(fabs(r - 2.0f*fps) / fps < 0.002f)
   score += 1<<8;
       else 
-  score += (1<<28)/r; // bad - but prefer higher framerate
+  score += (1<<16) + (1<<20)/r; // bad - but prefer higher framerate
 
       /* Check size too, only choose, bigger resolutions */
       if(width && height) 
@@ -448,12 +450,15 @@ void SetVideoMode(int width, int height, int fpsrate, int fpsscale, FORMAT_3D_T
 
   if(tv_found)
   {
+    char response[80];
     printf("Output mode %d: %dx%d@%d %s%s:%x\n", tv_found->code, tv_found->width, tv_found->height, 
            tv_found->frame_rate, tv_found->native?"N":"", tv_found->scan_mode?"I":"", tv_found->code);
+    if (m_NativeDeinterlace && tv_found->scan_mode)
+      vc_gencmd(response, sizeof response, "hvs_update_fields %d", 1);
+
     // if we are closer to ntsc version of framerate, let gpu know
     int ifps = (int)(fps+0.5f);
     bool ntsc_freq = fabs(fps*1001.0f/1000.0f - ifps) < fabs(fps-ifps);
-    char response[80];
     vc_gencmd(response, sizeof response, "hdmi_ntsc_freqs %d", ntsc_freq);
 
     /* inform TV of any 3D settings. Note this property just applies to next hdmi mode change, so no need to call for 2D modes */
@@ -631,6 +636,7 @@ int main(int argc, char *argv[])
   const int layer_opt       = 0x20b;
   const int no_keys_opt     = 0x20c;
   const int anaglyph_opt    = 0x20d;
+  const int native_deinterlace_opt = 0x20e;
 
   struct option longopts[] = {
     { "info",         no_argument,        NULL,          'i' },
@@ -645,6 +651,7 @@ int main(int argc, char *argv[])
     { "amp",          required_argument,  NULL,          amp_opt },
     { "deinterlace",  no_argument,        NULL,          'd' },
     { "nodeinterlace",no_argument,        NULL,          no_deinterlace_opt },
+    { "nativedeinterlace",no_argument,    NULL,          native_deinterlace_opt },
     { "anaglyph",     required_argument,  NULL,          anaglyph_opt },
     { "hw",           no_argument,        NULL,          'w' },
     { "3d",           required_argument,  NULL,          '3' },
@@ -730,6 +737,10 @@ int main(int argc, char *argv[])
       case no_deinterlace_opt:
         m_NoDeinterlace = true;
         break;
+      case native_deinterlace_opt:
+        m_NoDeinterlace = true;
+        m_NativeDeinterlace = true;
+        break;
       case anaglyph_opt:
         m_anaglyph = (OMX_IMAGEFILTERANAGLYPHTYPE)atoi(optarg);
         break;
@@ -1029,11 +1040,11 @@ int main(int argc, char *argv[])
     m_3d = CONF_FLAGS_FORMAT_TB;
 
   // 3d modes don't work without switch hdmi mode
-  if (m_3d != CONF_FLAGS_FORMAT_NONE)
+  if (m_3d != CONF_FLAGS_FORMAT_NONE || m_NativeDeinterlace)
     m_refresh = true;
 
   // you really don't want want to match refresh rate without hdmi clock sync
-  if (m_refresh && !m_no_hdmi_clock_sync)
+  if ((m_refresh || m_NativeDeinterlace) && !m_no_hdmi_clock_sync)
     m_hdmi_clock_sync = true;
 
   if(!m_av_clock->OMXInitialize())
@@ -1772,6 +1783,11 @@ int main(int argc, char *argv[])
     printf("Stopped at: %02d:%02d:%02d\n", (t/3600), (t/60)%60, t%60);
   }
 
+  if (m_NativeDeinterlace)
+  {
+    char response[80];
+    vc_gencmd(response, sizeof response, "hvs_update_fields %d", 0);
+  }
   if(m_has_video && m_refresh && tv_state.display.hdmi.group && tv_state.display.hdmi.mode)
   {
     m_BcmHost.vc_tv_hdmi_power_on_explicit_new(HDMI_MODE_HDMI, (HDMI_RES_GROUP_T)tv_state.display.hdmi.group, tv_state.display.hdmi.mode);