ea->sample_rate  = ea->big_endian ? avio_rb32(pb) : avio_rl32(pb);
    ea->bytes        = avio_r8(pb);   /* 1=8-bit, 2=16-bit */
    if(ea->bytes == 0){
    av_log(s,AV_LOG_ERROR,"the file is corrupted, ea->bytes = 0\n");
    return AVERROR_INVALIDDATA;
    }
    ea->num_channels = avio_r8(pb);