CrystalHD: Change opaque_list_pop to return the node.

In preparation for adding additional fields to the node, return
the node instead of the pts value. This requires the caller to
free the node.
Signed-off-by: Philip Langdale <philipl@overt.org>

libavcodec/crystalhd.c

@@ -231,15 +231,17 @@ static uint64_t opaque_list_push(CHDContext *priv, uint64_t reordered_opaque)
  * The OpaqueList is built in decode order, while elements will be removed
  * in presentation order. If frames are reordered, this means we must be
  * able to remove elements that are not the first element.
+ *
+ * Returned node must be freed by caller.
  */
-static uint64_t opaque_list_pop(CHDContext *priv, uint64_t fake_timestamp)
+static OpaqueList *opaque_list_pop(CHDContext *priv, uint64_t fake_timestamp)
 {
     OpaqueList *node = priv->head;
 
     if (!priv->head) {
         av_log(priv->avctx, AV_LOG_ERROR,
                "CrystalHD: Attempted to query non-existent timestamps.\n");
-        return AV_NOPTS_VALUE;
+        return NULL;
     }
 
     /*
@@ -247,14 +249,13 @@ static uint64_t opaque_list_pop(CHDContext *priv, uint64_t fake_timestamp)
      * the head pointer rather than the previous element in the list.
      */
     if (priv->head->fake_timestamp == fake_timestamp) {
-        uint64_t reordered_opaque = node->reordered_opaque;
         priv->head = node->next;
-        av_free(node);
 
         if (!priv->head->next)
             priv->tail = priv->head;
 
-        return reordered_opaque;
+        node->next = NULL;
+        return node;
     }
 
     /*
@@ -262,24 +263,23 @@ static uint64_t opaque_list_pop(CHDContext *priv, uint64_t fake_timestamp)
      * previous element available to rewrite its next pointer.
      */
     while (node->next) {
-        OpaqueList *next = node->next;
-        if (next->fake_timestamp == fake_timestamp) {
-            uint64_t reordered_opaque = next->reordered_opaque;
-            node->next = next->next;
-            av_free(next);
+        OpaqueList *current = node->next;
+        if (current->fake_timestamp == fake_timestamp) {
+            node->next = current->next;
 
             if (!node->next)
                priv->tail = node;
 
-            return reordered_opaque;
+            current->next = NULL;
+            return current;
         } else {
-            node = next;
+            node = current;
         }
     }
 
     av_log(priv->avctx, AV_LOG_VERBOSE,
            "CrystalHD: Couldn't match fake_timestamp.\n");
-    return AV_NOPTS_VALUE;
+    return NULL;
 }
 
 
@@ -517,6 +517,7 @@ static inline CopyRet copy_frame(AVCodecContext *avctx,
     uint8_t interlaced;
 
     CHDContext *priv = avctx->priv_data;
+    int64_t pkt_pts  = AV_NOPTS_VALUE;
 
     uint8_t bottom_field = (output->PicInfo.flags & VDEC_FLAG_BOTTOMFIELD) ==
                            VDEC_FLAG_BOTTOMFIELD;
@@ -530,6 +531,16 @@ static inline CopyRet copy_frame(AVCodecContext *avctx,
     uint8_t *dst;
     int dStride;
 
+    if (output->PicInfo.timeStamp != 0) {
+        OpaqueList *node = opaque_list_pop(priv, output->PicInfo.timeStamp);
+        if (node) {
+            pkt_pts = node->reordered_opaque;
+            av_free(node);
+        }
+        av_log(avctx, AV_LOG_VERBOSE, "output \"pts\": %"PRIu64"\n",
+               output->PicInfo.timeStamp);
+    }
+
     ret = DtsGetDriverStatus(priv->dev, &decoder_status);
     if (ret != BC_STS_SUCCESS) {
         av_log(avctx, AV_LOG_ERROR,
@@ -608,11 +619,7 @@ static inline CopyRet copy_frame(AVCodecContext *avctx,
     if (interlaced)
         priv->pic.top_field_first = !bottom_first;
 
-    if (output->PicInfo.timeStamp != 0) {
-        priv->pic.pkt_pts = opaque_list_pop(priv, output->PicInfo.timeStamp);
-        av_log(avctx, AV_LOG_VERBOSE, "output \"pts\": %"PRIu64"\n",
-               priv->pic.pkt_pts);
-    }
+    priv->pic.pkt_pts = pkt_pts;
 
     if (!priv->need_second_field) {
         *data_size       = sizeof(AVFrame);