CrystalHD: Keep mp4toannexb filter around for entire decoder lifetime.

In preparation for using the filter on the actual bitstream, we need
to extend it's lifetime to match that of the decoder.
Signed-off-by: Philip Langdale <philipl@overt.org>

libavcodec/crystalhd.c

@@ -124,6 +124,7 @@ typedef struct {
     AVFrame pic;
     HANDLE dev;
 
+    AVBitStreamFilterContext *bsfc;
     AVCodecParserContext *parser;
 
     uint8_t is_70012;
@@ -338,6 +339,9 @@ static av_cold int uninit(AVCodecContext *avctx)
     DtsDeviceClose(device);
 
     av_parser_close(priv->parser);
+    if (priv->bsfc) {
+        av_bitstream_filter_close(priv->bsfc);
+    }
 
     av_free(priv->sps_pps_buf);
 
@@ -397,7 +401,6 @@ static av_cold int init(AVCodecContext *avctx)
         {
             uint8_t *dummy_p;
             int dummy_int;
-            AVBitStreamFilterContext *bsfc;
 
             uint32_t orig_data_size = avctx->extradata_size;
             uint8_t *orig_data = av_malloc(orig_data_size);
@@ -409,16 +412,15 @@ static av_cold int init(AVCodecContext *avctx)
             memcpy(orig_data, avctx->extradata, orig_data_size);
 
 
-            bsfc = av_bitstream_filter_init("h264_mp4toannexb");
-            if (!bsfc) {
+            priv->bsfc = av_bitstream_filter_init("h264_mp4toannexb");
+            if (!priv->bsfc) {
                 av_log(avctx, AV_LOG_ERROR,
                        "Cannot open the h264_mp4toannexb BSF!\n");
                 av_free(orig_data);
                 return AVERROR_BSF_NOT_FOUND;
             }
-            av_bitstream_filter_filter(bsfc, avctx, NULL, &dummy_p,
+            av_bitstream_filter_filter(priv->bsfc, avctx, NULL, &dummy_p,
                                        &dummy_int, NULL, 0, 0);
-            av_bitstream_filter_close(bsfc);
 
             priv->sps_pps_buf     = avctx->extradata;
             priv->sps_pps_size    = avctx->extradata_size;