libhb: improve scanning of DTS audio

It seems ffmpeg's stream probe does not always go deep enough to
trigger the decoder to fill in the DTS profile. HandBrake's subsequent
audio probe during scan picks up the profile.

Fixes HandBrake#6237

libhb/scan.c

@@ -1525,6 +1525,41 @@ static void LookForAudio(hb_scan_t *scan, hb_title_t * title, hb_audio_t * audio
     audio->config.in.flags = info.flags;
     audio->config.in.mode = info.mode;
 
+    // Under some circumstances, ffmpeg fails to probe the DTS profile
+    // during it's initial scan of DTS audio tracks. The profile gets
+    // picked up during our more indepth scan here.
+    if (audio->config.in.codec == HB_ACODEC_FFMPEG)
+    {
+        switch (audio->config.in.codec_param)
+        {
+            case AV_CODEC_ID_DTS:
+            {
+                switch (info.profile)
+                {
+                    case AV_PROFILE_DTS:
+                    case AV_PROFILE_DTS_ES:
+                    case AV_PROFILE_DTS_96_24:
+                    case AV_PROFILE_DTS_EXPRESS:
+                        audio->config.in.codec = HB_ACODEC_DCA;
+                        break;
+
+                    case AV_PROFILE_DTS_HD_MA:
+                    case AV_PROFILE_DTS_HD_HRA:
+                    case AV_PROFILE_DTS_HD_MA_X:
+                    case AV_PROFILE_DTS_HD_MA_X_IMAX:
+                        audio->config.in.codec = HB_ACODEC_DCA_HD;
+                        break;
+
+                    default:
+                        break;
+                }
+            } break;
+
+            default:
+                break;
+        }
+    }
+
     // now that we have all the info, set the audio description
     const char *codec_name   = NULL;
     const char *profile_name = NULL;