st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->channels = avio_rl32(s->pb);
st->codecpar->sample_rate = avio_rl32(s->pb);
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
st->codecpar->channels = avio_rl32(s->pb);
st->codecpar->sample_rate = avio_rl32(s->pb);