u_int8_t header[6];
uint8_t header[6];
static int amr_read_header(AVFormatContext *s,                           AVFormatParameters *ap){    ByteIOContext *pb = &s->pb;    AVStream *st;    u_int8_t header[6];    get_buffer(pb, header, 6);    if(memcmp(header,AMR_header,6)!=0)    {        return -1;    }    st = av_new_stream(s, 0);    if (!st)        return AVERROR_NOMEM;    st->codec.codec_type = CODEC_TYPE_AUDIO;    st->codec.codec_tag = CODEC_ID_AMR_NB;    st->codec.codec_id = CODEC_ID_AMR_NB;    st->codec.channels = 1;    st->codec.sample_rate = 8000;    return 0;}