st->codec->codec_id = AV_CODEC_ID_ADPCM_AFC;
st->codec->channels = 2;
st->codec->channel_layout = AV_CH_LAYOUT_STEREO;
- st->codec->extradata_size = 1;
- st->codec->extradata = av_mallocz(1 + FF_INPUT_BUFFER_PADDING_SIZE);
- if (!st->codec->extradata)
+ if (ff_alloc_extradata(st->codec, 1))
return AVERROR(ENOMEM);
st->codec->extradata[0] = 8 * st->codec->channels;