st = malloc(sizeof(AVStream));
st = av_malloc(sizeof(AVStream));
static int mp3_read_header(AVFormatContext *s,                           AVFormatParameters *ap){    AVStream *st;    st = malloc(sizeof(AVStream));    if (!st)        return -1;    s->nb_streams = 1;    s->streams[0] = st;    st->id = 0;    st->codec.codec_type = CODEC_TYPE_AUDIO;    st->codec.codec_id = CODEC_ID_MP2;    /* the parameters will be extracted from the compressed bitstream */    return 0;}