atrac3: do not use init_static_data to init VLC data.

It would be called while registering the codec, which means
it needlessly wastes memory when it is never used.
Instead do the work when first opening the codec.
Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>

libavcodec/atrac3.c

@@ -837,7 +837,7 @@ static int atrac3_decode_frame(AVCodecContext *avctx, void *data,
     return avctx->block_align;
 }
 
-static void atrac3_init_static_data(AVCodec *codec)
+static void atrac3_init_static_data(void)
 {
     int i;
 
@@ -864,6 +864,7 @@ static void atrac3_init_static_data(AVCodec *codec)
 
 static av_cold int atrac3_decode_init(AVCodecContext *avctx)
 {
+    static int static_init_done;
     int i, ret;
     int version, delay, samples_per_frame, frame_factor;
     const uint8_t *edata_ptr = avctx->extradata;
@@ -874,6 +875,10 @@ static av_cold int atrac3_decode_init(AVCodecContext *avctx)
         return AVERROR(EINVAL);
     }
 
+    if (!static_init_done)
+        atrac3_init_static_data();
+    static_init_done = 1;
+
     /* Take care of the codec-specific extradata. */
     if (avctx->extradata_size == 14) {
         /* Parse the extradata, WAV format */
@@ -1003,7 +1008,6 @@ AVCodec ff_atrac3_decoder = {
     .id               = AV_CODEC_ID_ATRAC3,
     .priv_data_size   = sizeof(ATRAC3Context),
     .init             = atrac3_decode_init,
-    .init_static_data = atrac3_init_static_data,
     .close            = atrac3_decode_close,
     .decode           = atrac3_decode_frame,
     .capabilities     = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,