CrystalHD: Carry picture type from input to output picture.

Now that we know the type of the input picture, we have to bring
that information to the output picture to help identify its type.
We do this by adding a field to the opaque_list node.
Signed-off-by: Philip Langdale <philipl@overt.org>

libavcodec/crystalhd.c

@@ -114,6 +114,7 @@ typedef struct OpaqueList {
     struct OpaqueList *next;
     uint64_t fake_timestamp;
     uint64_t reordered_opaque;
+    uint8_t pic_type;
 } OpaqueList;
 
 typedef struct {
@@ -209,7 +210,8 @@ static inline void print_frame_info(CHDContext *priv, BC_DTS_PROC_OUT *output)
  * OpaqueList functions
  ****************************************************************************/
 
-static uint64_t opaque_list_push(CHDContext *priv, uint64_t reordered_opaque)
+static uint64_t opaque_list_push(CHDContext *priv, uint64_t reordered_opaque,
+                                 uint8_t pic_type)
 {
     OpaqueList *newNode = av_mallocz(sizeof (OpaqueList));
     if (!newNode) {
@@ -226,6 +228,7 @@ static uint64_t opaque_list_push(CHDContext *priv, uint64_t reordered_opaque)
     }
     priv->tail = newNode;
     newNode->reordered_opaque = reordered_opaque;
+    newNode->pic_type = pic_type;
 
     return newNode->fake_timestamp;
 }
@@ -530,6 +533,7 @@ static inline CopyRet copy_frame(AVCodecContext *avctx,
 
     CHDContext *priv = avctx->priv_data;
     int64_t pkt_pts  = AV_NOPTS_VALUE;
+    uint8_t pic_type = 0;
 
     uint8_t bottom_field = (output->PicInfo.flags & VDEC_FLAG_BOTTOMFIELD) ==
                            VDEC_FLAG_BOTTOMFIELD;
@@ -547,10 +551,23 @@ static inline CopyRet copy_frame(AVCodecContext *avctx,
         OpaqueList *node = opaque_list_pop(priv, output->PicInfo.timeStamp);
         if (node) {
             pkt_pts = node->reordered_opaque;
+            pic_type = node->pic_type;
             av_free(node);
+        } else {
+            /*
+             * We will encounter a situation where a timestamp cannot be
+             * popped if a second field is being returned. In this case,
+             * each field has the same timestamp and the first one will
+             * cause it to be popped. To keep subsequent calculations
+             * simple, pic_type should be set a FIELD value - doesn't
+             * matter which, but I chose BOTTOM.
+             */
+            pic_type = PICT_BOTTOM_FIELD;
         }
         av_log(avctx, AV_LOG_VERBOSE, "output \"pts\": %"PRIu64"\n",
                output->PicInfo.timeStamp);
+        av_log(avctx, AV_LOG_VERBOSE, "output picture type %d\n",
+               pic_type);
     }
 
     ret = DtsGetDriverStatus(priv->dev, &decoder_status);
@@ -781,7 +798,7 @@ static int decode(AVCodecContext *avctx, void *data, int *data_size, AVPacket *a
              * avoiding mangling so we need to build a mapping to values
              * we know will not be mangled.
              */
-            uint64_t pts = opaque_list_push(priv, avctx->pkt->pts);
+            uint64_t pts = opaque_list_push(priv, avctx->pkt->pts, pic_type);
             if (!pts) {
                 return AVERROR(ENOMEM);
             }