CrystalHD: Simplfy extradata handling for non-Annex B content.

Originally, we needed to restore the original extradata after
initialising the mp4toannexb filter because mplayer would end up
taking two passes through the init sequence for the same stream
and end up miscategorising the stream. This doesn't seem to happen
anymore, making the backup/restore process unnecessary.
Signed-off-by: Philip Langdale <philipl@overt.org>

libavcodec/crystalhd.c

@@ -402,34 +402,19 @@ static av_cold int init(AVCodecContext *avctx)
             uint8_t *dummy_p;
             int dummy_int;
 
-            uint32_t orig_data_size = avctx->extradata_size;
-            uint8_t *orig_data = av_malloc(orig_data_size);
-            if (!orig_data) {
-                av_log(avctx, AV_LOG_ERROR,
-                       "Failed to allocate copy of extradata\n");
-                return AVERROR(ENOMEM);
-            }
-            memcpy(orig_data, avctx->extradata, orig_data_size);
-
+            format.startCodeSz = (avctx->extradata[4] & 0x03) + 1;
 
             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(priv->bsfc, avctx, NULL, &dummy_p,
                                        &dummy_int, NULL, 0, 0);
 
-            priv->sps_pps_buf     = avctx->extradata;
-            priv->sps_pps_size    = avctx->extradata_size;
-            avctx->extradata      = orig_data;
-            avctx->extradata_size = orig_data_size;
-
-            format.pMetaData   = priv->sps_pps_buf;
-            format.metaDataSz  = priv->sps_pps_size;
-            format.startCodeSz = (avctx->extradata[4] & 0x03) + 1;
+            format.pMetaData  = avctx->extradata;
+            format.metaDataSz = avctx->extradata_size;
         }
         break;
     case BC_MSUBTYPE_H264: