oggparsecelt: use ff_alloc_extradata()

Signed-off-by: James Almer <jamrial@gmail.com>
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/oggparsecelt.c

@@ -44,16 +44,10 @@ static int celt_header(AVFormatContext *s, int idx)
 
         uint32_t version, sample_rate, nb_channels, frame_size;
         uint32_t overlap, extra_headers;
-        uint8_t *extradata;
 
-        extradata = av_malloc(2 * sizeof(uint32_t) +
-                              FF_INPUT_BUFFER_PADDING_SIZE);
         priv = av_malloc(sizeof(struct oggcelt_private));
-        if (!extradata || !priv) {
-            av_free(extradata);
-            av_free(priv);
+        if (!priv || ff_alloc_extradata(st->codec, 2 * sizeof(uint32_t)))
             return AVERROR(ENOMEM);
-        }
         version          = AV_RL32(p + 28);
         /* unused header size field skipped */
         sample_rate      = AV_RL32(p + 36);
@@ -67,16 +61,13 @@ static int celt_header(AVFormatContext *s, int idx)
         st->codec->sample_rate    = sample_rate;
         st->codec->channels       = nb_channels;
         st->codec->frame_size     = frame_size;
-        av_free(st->codec->extradata);
-        st->codec->extradata      = extradata;
-        st->codec->extradata_size = 2 * sizeof(uint32_t);
         if (sample_rate)
             avpriv_set_pts_info(st, 64, 1, sample_rate);
         priv->extra_headers_left  = 1 + extra_headers;
         av_free(os->private);
         os->private = priv;
-        AV_WL32(extradata + 0, overlap);
-        AV_WL32(extradata + 4, version);
+        AV_WL32(st->codec->extradata + 0, overlap);
+        AV_WL32(st->codec->extradata + 4, version);
         return 1;
     } else if (priv && priv->extra_headers_left) {
         /* Extra headers (vorbiscomment) */